Building Services Consultants and ESD Specialists · Building Services Consultants and ESD Specialists ... capable of both design and construction, ... Level 1 Piping Layout • M05

Innerscape Ltd Building Services Consultants and ESD Specialists

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5 Northway St, Hamilton

DOC Refurbishment – Mechanical Specification Rev 0 Innerscape Ltd

Department Of Conservation – Refurbishments

Mechanical Specification

Prepared for

Department of Conservation

Prepared by

Innerscape Ltd PO Box 991 Cambridge, NZ In association with

Stiles & Hooker

REVISION HISTORY

Revision Number Purpose Date Prepared By

0 Consent & Tender Issue 25th November 2016 Hamish Lewis & Ken

McKenzie

© Innerscape Ltd 2016

The information contained in this document produced by Innerscape Ltd is solely for the client identified on the cover sheet for the purpose for which it has been prepared and Innerscape Ltd takes no duty to or accepts and responsibility to any third party who may rely upon this document. All rights reserved. No section or element of this document may be removed from this document, reproduced, electronically stored or transmitted in any form without the written permission of Innerscape Ltd.

DOC Refurbishment – Mechanical Specification Rev 0 Innerscape Ltd 1

TABLE OF CONTENTS 1. Preliminary and General 1 1.1 General 1 1.2 Conditions of Contract 1 1.3 Intent 1 1.4 Definitions and Abbreviations 1 1.5 Relationship with Project Management 2 1.6 Mechanical Services Contractor’s Obligation to Be Informed 2 1.7 Contract Drawings 2 1.8 Drawings to Be Supplied By the Mechanical Services Contractor 3 1.9 Programme of Works 3 1.10 Site Meetings 3 1.11 Erection Staff 3 1.12 Other Trades 3 1.13 Authorities 4 1.14 Safety Management Plan 5 1.15 Errors, Ambiguities and Omissions 5 1.16 Equipment Manufacture 6 1.17 Provision for Contract Plant 6 1.18 Site Facilities 6 1.19 Materials for Construction and Finishes 6 1.20 Built In Materials 7 1.21 Positioning of Equipment 7 1.22 Alternatives 7 1.23 Packaging of Equipment 7 1.24 Approval and Provision of Information 8 1.25 Protection of Works & Building 8 1.26 Avoidance of Nuisance 8 1.27 Workmanship 9 1.28 As Built Documents 9 1.29 Instructions to Owner’s Staff 10 1.30 Commissioning, Inspection and Testing 11 1.31 Guarantee 12 1.32 Preventative Maintenance and Defects Liability 12 1.33 Practical Completion 13 1.34 Final Completion 13 1.35 Monetary Allowances 13 1.36 Extra Payments 13 2. Scope of Works 14 2.1 Preamble 14 2.2 Scope of Works 14 2.3 General 15 2.4 Description of Systems 15 2.5 Coordination with Other Services 17 3. HVAC Systems Technical Clauses 19 3.1 Design Parameters 19 3.2 VRF Air Conditioning/ Heat Pump Systems 19 3.3 Fans 22 3.4 Electric Duct Heaters 23 3.5 Air Filters 23 3.6 Louvres 23 3.7 Ductwork and Fittings 23


3.8 Air System Tests 27 3.9 Pipework 27 3.10 Thermal and Acoustic Insulation 32 3.11 Sound and Vibration Control 33 3.12 Electric Motors 35 3.13 Controls 36 3.14 Electrical For Mechanical Plant 39 3.15 Corrosion Prevention 48 3.16 Galvanising 49 3.17 Provision for Seismic Movement 49 3.18 Oil and Lubricants 49 3.19 Identification 49 3.20 Commissioning, Inspection and Testing 50 Appendix A - Equipment Schedules 1 A.1 VRF System Heat Pump/Air Conditioning Units 2 A.2 Fans 3 A.3 Filters 3 A.4 Duct Heaters 3 A.5 Supply Diffusers 4 A.6 Return/Transfer Grilles 4 A.7 Extract Grilles 4 A.8 Door Grilles 5 A.9 Louvres 5 Appendix B – Schedule of Prices 1


1. Preliminary and General

1.1 General

This specification covers the technical requirements for the mechanical heating, ventilation, and air conditioning installations associated with the refurbishment of the Department of Conservation office building in Te Rapa, Hamilton.

1.2 Conditions of Contract

The Conditions of Contract which apply to all work in this section shall be in accordance with the signed Head Contract agreement. General requirements specific to this project are contained in the Preliminary and General section of the main contract. Tenderers and their subcontractors shall be bound by all provisions of the Main Contractor’s Specific Conditions of Contract. This will include contributing and adhering to Quality Management and Health and Safety procedures with the Construction Manager.

1.3 Intent

The nature and spirit of this specification is to provide for the work herein set out and as shown on the accompanying drawings to be fully completed in every detail for the purpose designed. The Mechanical Services Contractor shall furnish everything reasonably necessary for such construction not withstanding any omissions in the drawings and/or specifications.

This section of the work shall be carried out only by Mechanical Services contractors who can show they have had recent and successful experience on work of a similar nature and magnitude, and evidence of this experience shall be submitted if requested. The Mechanical Services Subcontractor shall be approved by Innerscape Limited.

Any doubts or apparent ambiguities as to the meaning of any part of the drawings or specifications shall have been set forth in writing with the tender in order that such doubt or ambiguity may be removed or provided for before acceptance of tender. Otherwise such portion of the drawings or specifications shall bear the meaning placed upon them by the Mechanical Engineer.

The Contract includes all work incidental to the work shown and specified and as necessitated by the conditions of the site or of the works or of the materials as apparent or as discovered during the progress of the Works.

The intent is that all systems supplied under this contract are complete in every respect, and all items and work necessary to this shall be deemed to be included whether specifically indicated or not.

By submission of a tender the Tenderer warrants that he is expert in understanding the systems, capable of both design and construction, and that all work will be suitable for its intended function where located, and will comply with all requirements of statutory and other authorities having jurisdiction.

1.4 Definitions and Abbreviations

The term “Contract” used herein refers to the work included in this Specification.

The terms “Employer”, “Client”, “Principal”, and “Owner” refer to Department of Conservation.

The terms “Mechanical Engineer” and “Engineers” used herein refer to Innerscape Ltd.

The terms “Architect” and “Structural Engineer” used herein refer to Stiles & Hooker Ltd.

The term “Project Manager” used herein refers to Stiles & Hooker.

The terms “Construction Manager” and “Main Contractor” used herein refer to the main contractor responsible for construction of the building.


The terms “Mechanical Services Contractor”, “Contractor”, or “Sub-Contractor” used herein refers to the Mechanical Services Contractor and his designated Sub-Contractors, regardless of actual contractual relationships, e.g. Nominated Contractor, engaged to complete all works described in this Contract.

“Approved” shall mean subject to the inspection and entire approval of the Mechanical Engineer and client before being worked or fitted into the Contract works.

“Provide” and “Install” used separately shall be interpreted to mean “Provide and Install”, and shall include all testing, setting to work and maintenance.

“Indicated” means, as indicated on the Contract drawings and specification and by notes, figures, sketches or writing, thereon or by any combination thereof.

1.5 Relationship with Project Management

The overall control of the Mechanical Sub-Contract will be affected by the Project Manager in collaboration with the Mechanical Engineer. The Engineers for the work covered by this specification will act as the agents of the Owner, in the administration of this Contract.

1.6 Mechanical Services Contractor’s Obligation to Be Informed

The Mechanical Services Contractor shall be deemed to have carefully examined the Main Contract Documents, Specification, and Drawings, as well as the Mechanical Services contract documentation. Any doubt as to the meaning of any portion of these documents shall be detailed and submitted in writing to the Mechanical Engineer in order that such doubt may be removed before submitting a tender.

The Mechanical Services Contractor must carefully consider local conditions, specific site requirements, visit the site of the proposed work and make any field survey necessary for proper planning, and execution of the work. Failure to do so shall in no way relieve the Mechanical Services Contractor of responsibility for changes or unanticipated costs due to field conditions.

After a tender has been accepted the responsibility for any misunderstanding or error shall rest with the Mechanical Services Contractor. The Mechanical Services Contractor shall review the existing site installation and satisfy himself that the work under his contract can be satisfactorily carried out without changes to the building. Before commencement of his work he shall examine the existing installation and report at once any defect or interference affecting his own work or the warranty of same. No extras will be allowed subsequently for his omission to make adequate inspection or take adequate precaution.

Arrange the contract works in co-operation with sub trades so that all work is installed to the best advantage. Where equipment is installed without due regard to other trades, relocation of such equipment shall be performed by the Mechanical Services Contractor at his own expense.

1.7 Contract Drawings

The drawings listed below shall form part of and shall be read in conjunction with this Specification.

• M00 – Cover Sheet and Legend

• M01 – Ground HVAC Layout

• M02 – Level 1 HVAC Layout 1

• M03 – Ground Piping Layout

• M04 – Level 1 Piping Layout

• M05 – VRF Schematic

One set of all drawings shall be kept on site by the Mechanical Services Contractor.

The Contract drawings show the system layouts, general arrangements and requirements, and shall be varied only as necessary to accommodate alternative plant or otherwise as agreed by the


Mechanical Engineer. They do not necessarily show all levels, sets, deviations, supports, etc. Such items shall be provided at no extra cost. Exact locations, distances and levels shall be confirmed on the site.

1.8 Drawings to Be Supplied By the Mechanical Services Contractor

The Mechanical Services Contractor shall provide installation and record drawings.

1.8.1 Installation Drawings

The Contractor may utilise the tender drawings as working drawings for installation on site, but shall be responsible of detailing as necessary and verification and coordination of all dimensions and locations on site. Prepare any additional installation drawings as may be required for shop fabrication. Installation variation drawings shall be submitted for review by the Mechanical Engineer before manufacture. Allow two weeks for review, and amend as necessary.

Review all relevant drawings, including architectural, structural, and other sub-trades, and co-ordinate and co-operate with the Main Contractor and the relevant Contractors to avoid conflict with the building structure and other building. Any changes required due to this co-ordination shall be provided at no extra cost.

Contractor responsibilities shall include all details necessary for the proper accommodation of the plant as a whole. This includes all foundation, and fixing bolts details, access details and such other items as the Mechanical Engineer may require. Should any alterations be necessitated to the Mechanical Engineer’s works or design due to errors in, or late availability of information from the Mechanical Services Contractor, all charges incurred in the correction or alteration shall be to the Mechanical Services Contractor’s expense.

Any variations shall be clearly marked in red ink on the site drawings and shall be used for the preparation of the “As Built” drawings.

1.9 Programme of Works

Refer to the Main Contract documentation for programme of works and subsequent revisions as issued by the Main Contractor.

Plan and co-ordinate and execute all Contract Works with the programme associated with the project.

1.10 Site Meetings

A senior and responsible representative of the Mechanical Services Contractor’s staff with powers of making binding decisions on behalf of the Mechanical Services Contractor shall attend all site meetings called by the Project Manager, Construction Manager, or Engineer. An initial Contract Pre Start Meeting will be held on-site prior to any site works starting.

1.11 Erection Staff

The Mechanical Services Contractor shall employ:

• Fully competent staff and shall maintain staff continuity and the required numbers of staff as necessitated by the progress of works

• A competent foreman, who shall be continuously available on site, and shall direct the Contract works to the Mechanical Engineer’s requirements

The Mechanical Engineer reserves the right to require any member of the Mechanical Services Contractor’s staff to be removed or replaced for whatever reason.

1.12 Other Trades

1.12.1 Relationship with Other Trades

Carefully examine all parts of the work against which materials are to be placed, and report immediately to the Construction Manager any defects, etc. that would prevent the satisfactory


execution or permanency of the work and shall proceed only after unsatisfactory preparatory work has been corrected. Failure to examine and report shall be construed as an acceptance that such preparatory work is satisfactory.

After the work of other trades is finished, make good damaged portions of his work, to the satisfaction of the Mechanical Engineer

1.12.2 Liaison with Other Trades

Maintain an effective liaison with the Construction Manager and all other trades, to ensure works proceed in the correct sequence.

1.13 Authorities

1.13.1 Regulations

The Contract Works shall comply with all current versions, including all amendments, of all relevant statutory regulations and N.Z. standards including but not limited to:

• The New Zealand Building Act 2004 and Amendments.

• The New Zealand Building Code.

• The requirements of the Local Authorities.

• All requirements of the Electricity Regulations.

• The requirements of the Electrical Supply Line Company.

• The requirements of Telecom Corporation of New Zealand Limited.

• The requirements of the Health and Safety in Employment Act

• The requirements of the Hazardous Substances & New Organisms Act and the Dangerous Goods Regulations.

• New Zealand Pressure Equipment, Crane and Passenger Ropeways (PECPR) Regulations.

• The requirements of the New Zealand Fire Service, Local Fire Brigade and the Fire and Accident Underwriters Association.

• The New Zealand Radio Interference Regulations and Interference Notices (Radio and Television).

• The requirements of NZS 4219: - Specification for Seismic Resistance of Engineering Systems in Buildings.

• Appropriate standard specifications and amendments, and codes of practices listed in NZ Standard Association publications which are current at the time of tendering.

• Electrical: IEC 204-1, CEI 4-5.

• Reference: AS4343:2005 Pressure Equipment Hazard Levels, NZ Approved Code of Practice for Pressure Equipment Excluding Boilers, PEC PR Regulations 1999.

• Safety: AS/NZS 1677 Refrigerant Classification and Safety Requirements, SAA HB40 Australian Refrigeration and Air Conditioning Code of Good Practice, BS4434 Refrigeration Safety Code, ISO R1662 Refrigeration Plants - Safety Rules, ANSI B9-1 Safety Code, and CEI-EN 60204-1 Codes.

In addition, all materials, apparatus and workmanship shall comply in standards and performance with the most recent revisions of the documents promulgated by the Standards Association of New Zealand and in particular:-

• AS 1668/1: The use of mechanical ventilation and air conditioning in building – fire and smoke control in multi compartment buildings.

• AS 1668/2: The use of mechanical ventilation and air conditioning in building – mechanical ventilation for acceptable air quality.


• All requirements and recommendations of the NZ Electricity Regulations, and AS/NZS 3000 Wiring Rules.

• AS/NZS 3013: Electrical installations – Classification of fire and mechanical performance of wiring systems.

• AS/NZS 3500 (all parts): Plumbing and drainage.

• AS/NZS 5261: Installation of Gas Burning Appliances and Equipment.

Should there be any conflict between this Specification and the above Regulations and By-Laws; the matter shall be referred to the Mechanical Engineer for clarification.

1.13.2 Permits and Fees

The Mechanical Services Contractor shall give all necessary notices, obtain all necessary permits and pay all fees in order that the work may be carried out, and shall furnish all certificates as evidence that the works installed comply with laws and regulations. Bring to the attention of the Construction Manager, and clarify any unusual aspects of the installation with the relevant Authority during the permit application period.

Pay all fees and costs relating to patent rights, trademarks, or other protected rights and fully indemnify the Client against any claims arising there from.

1.14 Safety Management Plan

A project specific Safety Management Plan shall be prepared by the Mechanical Services Contractor prior to commencement of work, to ensure that the Contract Works are carried out in accordance with the Health and Safety in Employment Act and Huntly site requirements.

The Plan shall include, but be not limited to:

• Company’s safety policy

• Company’s safety training procedures

• Company’s recent safety record

• Site safety management organisation

• Site safety personnel

• Procedure for identifying and assessing hazards

• Procedure for recording of accidents

• Procedure for dealing with emergencies that may arise while employees are at work

• Procedure for monitoring health and safety performance

• Procedure for monitoring the health of employees where they are exposed to hazards

The Plan shall be submitted to the Mechanical Engineer who will pass it on to the Principal for approval prior to commencement of any on-site works.

In addition to the above, the Mechanical Services Contractor shall provide all safety devices required by Regulations or by normal good practice for the protection of personnel and plant. These shall include drive guards, handrails, cover plates, interlocking isolators, drip trays, drains, warning notices etc. Where any control will not fail to the “safe” positions, discuss with the Mechanical Engineer before proceeding with installation. Ensure that all temporary guards, handrails are securely mounted and all sharp corners and burrs are removed and covered.

1.15 Errors, Ambiguities and Omissions

Errors, ambiguities and omissions in drawings or specifications shall be reported to the Mechanical Engineer for correction before any part of the work involved is started. Unless otherwise expressly stipulated, no additional allowance shall be made because of errors, ambiguities or omissions which should reasonably have been discovered during the preparation


of the tender or which may become evident later and which should have been directed to the attention of the Mechanical Engineer in timely manner. The written decision of the Mechanical Engineer shall be final.

1.16 Equipment Manufacture

All materials and equipment supplied shall be new and of the highest quality.

All microprocessors and microchip-based systems in equipment and controls shall be fully date compliant and shall not generate date related faults.

Wherever practical and except as specified herein, New Zealand manufactured materials and equipment shall be used. Where suitable equipment is not manufactured in New Zealand, allowance for equipment which can be supplied without the need for special import licence authority is preferred. Any proposals to use overseas manufactured materials or equipment which requires a special import licence must be stated at the time of tender.

In such cases allow for any import licensing costs, sales tax, duty, and freight stating the values of these in the tender together with applicable currency exchange rates.

1.17 Provision for Contract Plant

Maintain an active liaison with the Construction Manager during the progress of the Contract to ensure that proper provision in correct sequence is made for the accommodation of the Contract plant.

Prepare and provide all necessary drawings.

Attend meetings on Site or elsewhere with the Construction Manager or Engineer.

Check and confirm during construction the correctness of any and all dimensions of holes, chases, plinths, foundations, bolts and fixings, embedded items, pipes and steelwork required to be provided for the purpose of accommodating the Contract Plant.

Thoroughly check the relevant dimensions by site measurements which shall take precedence over scaled figures. Make adjustments in conjunction with the Mechanical Engineer before fabrication, check all layouts before and after installation and be fully responsible for accuracy, levelling and proper placing of the work.

Ensure that all wiring and equipment required to be recessed or concealed in other work or structures is installed in advance of the completion of that work or structure.

No structural component or member shall be worked upon without written permission of the Structural Engineer. The cost of any alterations necessitated on account of failure of the Mechanical Services Contractor to comply with the requirements of this clause, or on account of inaccurate information or errors in checking by the Mechanical Services Contractor shall be deducted from the monies due to the Mechanical Services Contractor.

1.18 Site Facilities

Refer to the Main Contract preliminary and general clauses.

Provide any storage and workshop accommodation and all other facilities or required for carrying out the Contract works.

The Mechanical Services Contractor shall be responsible for providing the transport he may require to and from the site, and for providing tea facilities for his site staff.

Site access to Contractors vehicles will be controlled. Only vehicles necessary for the execution of the works will be permitted on site.

1.19 Materials for Construction and Finishes

The materials used in the construction of the equipment are to be of the highest quality of their respective kinds and, except where agreed in writing by the Mechanical Engineer are to be in


accordance with the latest recommendations of the appropriate New Zealand, Australian or British Standards current at the date of tendering.

All parts liable to rust, including screws, bolts and nuts shall be cadmium plated or hot dipped galvanised. Internal finishes shall be gloss white. All paintwork shall be thoroughly rubbed down between coats to remove runs and blemishes. The finished paintwork shall be free of any faults.

All metalwork in this Contract including cable tray, trunking, cable ladder, support frames and brackets etc. shall be protected against corrosion, to the satisfaction of the Mechanical Engineer. Prior to application of the process concerned, remove all scale, grease, rust, oil, welding slag and other foreign matter.

1.20 Built In Materials

Supply to the Main Contractor any item which is to be built in, and be responsible for setting out where such items require to be positioned and for clearly advising the Construction Manager of all requirements relevant to the building in of such materials. Check all such materials before any operation is performed which renders the positioning of the materials permanent. Attend on other trades.

1.21 Positioning of Equipment

The position of equipment shown on the drawings is indicative of requirements only, unless specifically detailed otherwise.

Study all other relevant documents and the site to ensure that no conflict with other services or features shall arise. Pipework and ductwork shall normally have precedence over cabling. Give notice of any conflicts, discrepancies or doubts, and await further instructions before proceeding with work affected.

Confirm on site before installation the exact location and mounting heights, etc. of all outlets, fittings, equipment, penetrations, etc. and of exposed wiring.

1.22 Alternatives

Nomination of particular manufacturer, reference or source of supply shall be taken (unless specifically noted otherwise), to indicate type and quality required but does not imply that the item so nominated necessarily fully complies with the specification, is readily available or must be obtained from that source.

Alternatives will be considered which:

• improve the performance without significant increase in overall cost

• reduce the cost without a reduction in the level of system performance

Tenders shall, however, be based on this specification, with all alternatives shown as optional variations with a deduction or addition to the basic tender for each alternative.

Any substitutions to specified equipment or materials must be approved by the design team and will only be considered if the Contractor can substantiate by written statement and certification that the product meets the specified ESD and performance criteria. The proposal of alternatives by the Contractor must be made with full and complete supporting information to allow assessment without further research.

1.23 Packaging of Equipment

All equipment delivered to the site for incorporating in the Contract works shall be adequately protected during transport and adequately protected during storage on site and elsewhere.

Damaged equipment shall be totally replaced with new items and not with repaired or second hand items.


1.24 Approval and Provision of Information

Within ample time to prevent construction delay, the Mechanical Services Contractor shall submit to the Project Manager for review:

• Equipment submissions (either confirmation specified equipment will be ordered, or details of any proposed alternatives)

• Confirmation of proposed piping and ductwork materials

• Confirmation that general arrangements shown on Tender drawings will be followed (or detailed drawings of proposed revisions)

• Details of proposed design-build electrical-for-mechanical and controls provisions

• Samples as may be requested by the Project Manager

Do not enter into any commitment or commence any work without the Project Manager’s written consent.

The onus lies on the Mechanical Services Contractor to seek this consent for any work but generally should be sought for proposed work which:

• Differs from that specified

• Is a major item of equipment

All costs incurred for correction or alteration work due to failure of the Mechanical Services Contractor to seek approval, or error in late submission of information supplied by the Mechanical Services Contractor shall be to the Mechanical Services Contractor’s account.

The following minimum information shall be included when seeking written consent.

• Equipment catalogue, dimensional, and performance data.

• Cable, trays, trunking, duct and pipe types, routes, depths and terminations.

• The mass and dimensions of all major items of equipment.

• Details of all switchboard connections and controls provisions.

Consent shall not relieve the Mechanical Services Contractor from his obligation to comply with this specification. Supply without delay, any samples, information or drawings requested by the Mechanical Engineer.

1.25 Protection of Works & Building

1.25.1 General

Take all reasonable steps to avoid other trades or environmental conditions from damaging or disfiguring equipment or materials of this contract by protecting the works adequately at appropriate stages of the Contract programme. Liaise with the Construction Manager and other trades in this regard.

Adequately protect equipment and incomplete works in areas exposed to the weather.

1.25.2 Access

Refer to the Main Contract Preliminary and General Section.

1.26 Avoidance of Nuisance

The contract shall be performed so as to avoid causing a nuisance to the owner, public or any other trade.

The contract works shall operate without undue noise, vibration or odour. Ensure that the attention of the Mechanical Engineer is drawn to any aspect of the plant which might cause a nuisance and modify the installation as instructed by the Mechanical Engineer.


1.27 Workmanship

1.27.1 General

Carry out all work in a neat and serviceable manner.

Follow best trade practices and comply with any manufacturer’s recommendations.

Position visible fittings, appliances, accessories etc., to conform to either an architectural module, a figured or standard dimension, or a simple fraction of the enclosure dimensions. Confirm positioning with the Mechanical Engineer before installation. Confirm mounting height and location of all fittings before installation.

Thoroughly check the relevant dimensions by site measurements which shall take precedence over scaled figures. Make adjustments in conjunction with the Mechanical Engineer before fabrication, check all layouts before and after installation and be fully responsible for accuracy, levelling and proper placing of the work.

Plan and set out all Mechanical equipment, ductwork, piping, and cable runs whether shown on the drawings or not.

1.27.2 Finish

The completely erected installation shall be handed over in a perfectly clean condition with all rust and dirt removed, paintwork in good clean condition, with erection scratches and other damage marks made good and bright parts properly cleaned and polished.

1.27.3 Cleaning

Keep the work areas clean and tidy at all times. Remove all rubbish as it accumulates. On completion, remove all debris and waste caused directly or indirectly by the work and leave the installation and surrounding areas completely clean.

All rejected items shall be removed from the site within 48 hours of written notice. If not completed, such items may be removed by others and the cost of removal deducted from monies due to the Mechanical Services Contractor.

1.28 As Built Documents

1.28.1 General

A draft of the “As Built” documents, consisting of “As-built” drawings and operating and maintenance manuals shall be provided prior to Practical Completion, for approval by the Mechanical Engineer.

All drawings and documents are to be provided in electronic and hard format to the quantities specified.

1.28.2 “As-Built” Drawings

The “As-built” drawings shall be in similar detail to the installation drawings, but shall include details of the work actually installed including variations to the contract during construction and any detail necessary to show functionality or installation or particular items of plant. The “As-built” drawings shall provide “true” record of the systems as installed and shall include, but not be limited to: drawing index; locations of access openings; major equipment; ductwork, diffusers, grilles and louvres layout; sizes of ductwork; sizes of cables, fuse or breaker capacities, wiring diagrams and schematics.

The drawings shall be titled “As-built”, dated and shall include the Mechanical Services Contractors name and address. All irrelevant data shall be removed from the drawings. Presentation and draughting of the “As-built” drawings shall be to the same standards as the contract drawings. Workshop drawings will not be accepted as “As-built” drawings. Draughting shall be carried out by a competent draughtsperson to AS/NZS 1100.

In order to achieve accurate drawings, all relevant information relating to the works shall be entered onto a clean set of working drawing prints kept by the Mechanical Services Contractor on site for the sole purpose of marking up contract changes immediately after the changes have


been carried out. The information shown on prints and final records shall be actually physically measured from permanent buildings, boundaries or other permanent features.

The approval of any drawings by the Mechanical Engineer in no way affects the Mechanical Services Contractor’s responsibility for the satisfactory completion of the Contract.

Acceptance of these drawings shall be required as a pre-requisite for Contract Completion.

As-built documents shall be provided as follows:

• Three copies of A3 paper prints bound into the Operation and Maintenance manuals as detailed below.

• Electronic versions of all “As-built” drawings in the latest AutoCAD version and pdf format provided on CD.

Electronic copies of the Mechanical Services Contract drawings can be supplied by the Mechanical Engineer.

1.28.3 Operation and Maintenance Manuals

Provide three hard copy sets of Maintenance Manuals and one copy in PDF format on CD. These shall include the following information:

• Details of Engineer, Contractors, and Sub-Contractors.

• Brief outline description of systems and principal design details.

• Instructions as appropriate to enable correct operation of systems.

• Schedule of all equipment showing location, maker’s name, performance details, and contact details of NZ agent.

• Copies of manufacturer’s technical information data sheets. Equipment identification references used in the contract shall be included on the sheets for easy identification.

• Spare parts lists.

• A description of routine maintenance required and maintenance sheets.

• A schedule of routine maintenance required.

• All commissioning test results.

• Warranties and Certifications

• A3 copy of “As-built” drawings.

• Detailed wiring diagrams for controls and electrical systems.

Note: The Mechanical Services Contractor shall ensure that the manual covers all “inspection and maintenance” and “reporting” as necessary to satisfy the requirements of the New Zealand Building Code for Compliance Schedules.

Manuals shall be supplied as a matching set for the Contract. All folders shall be black 3 ring binders. The spine shall indicate the same information as the front cover. The spine shall indicate the volume if more than one is required.

1.29 Instructions to Owner’s Staff

The Mechanical Contractor, and appropriate sub-contractors, shall provide comprehensive operating and maintenance instruction on building systems in accordance with the Contract Documents prior to delivery.

The Mechanical Contractor shall include for a structured programme of training and instruction to the Building Operating Staff prior to completion to ensure that the building owners and facilities management representatives understand the purpose and function, operation and maintenance of the commissioned works. Training issues are to include:

• Review of controls set-up, programming, alarms and troubleshooting.


• Review of O&M manuals.

• Explain the function and operation of all equipment, and indicate where these items are dealt with in the Operating and Maintenance instructions.

• Building operation (start-up, normal operation, unoccupied operation, seasonal changeover and shutdown).

• Occupancy health and safety (OH&S) issues.

• Indicate where and how any item of Contract equipment can be disconnected or isolated.

• Maintenance requirements and sourcing replacements.

The instruction shall include classroom instruction delivered by competent instructors based upon the contents of the operating manual. The on-site classroom-training period shall be followed by an inspection, explanation and demonstration of the system concerned by the instructors.

Formal Instruction shall be coordinated through the Mechanical Engineer and shall take place following provision and acceptance of final as-built, commissioning, and operation and maintenance documentation. The Mechanical Contractor shall be responsible for organizing, arranging, and delivering training.

The Mechanical Services Contractor shall assign a person thoroughly familiar with the Contract plant for the purpose of such instruction for a period of 4 hours, during which period his time shall be completely given over to instruction.

1.30 Commissioning, Inspection and Testing

(Note also refer to the Technical Specification). Inspection or tests may be required by the Mechanical Engineer on any item during or after their construction at the Manufacturer’s works.

Produce sample test sheets for Approval/Review for all installations to enable a full testing/commissioning record to be made, and record all results. Allow the Mechanical Engineer and any relevant local bodies, the opportunity of attending and witnessing the tests and commissioning.

Include the following in the test procedures:

• Check complete installation visually for compliance with the Specification.

• Check all Services Boards for operation of switches, circuit protection, contactors, controls etc.

• Check all air and water flow rates, heating and cooling capacities etc.

• Check all control systems sequences, timeclock settings, and controls calibration.

• Check operation during all emergency conditions such as fire alarms.

• Continuity and insulation resistance checks on all wiring and cabling. Ensure sensitive equipment is disconnected.

• Check all labelling.

• Check fixings of all equipment and systems installation to ensure stability under possible seismic conditions.

• Check and test all motors with regard to: insulation resistance, direction of rotation, loading, overload settings, fusing, and correct operation of any other protection equipment.

• Test and commission all equipment, components, circuits, and systems both independently and in association with the complete installation.

• Allow to employ the manufacturers of any specialist equipment installed to test and commission that equipment.

• Demonstrate the satisfactory operation of the installation and all component parts to the satisfaction of the Engineer.


• Provide all equipment and apparatus necessary for this demonstration.

• Carry out any tests the Engineer may require to demonstrate that the installation functions as specified or intended.

Any test not described herein, shall comply with the appropriate Standard Specification, as approved by the Engineer, or be as agreed in writing by the Engineer.

1.31 Guarantee

The Mechanical Services Contractor shall provide a written guarantee in respect of all materials supplied under the Contract against defects which may occur or be found in workmanship, materials and design (other than a design made furnished or specified by the Mechanical Engineer or the Engineer for which the Mechanical Services Contractor has disclaimed responsibility in writing within a reasonable time of receiving instructions) for a period of twelve (12) calendar months in service after the date of Practical Completion Certificate as detailed below.

All defects, except for fair wear and tear, shall be made good free of all costs to the Owner, whether or not the workmanship and materials have been previously inspected and accepted.

Refer to the “Preliminary and General” section of the Main Specification for the required form of warranty agreement and details of when the warranty agreement must be submitted.

1.32 Preventative Maintenance and Defects Liability

The Preventative Maintenance and Defects Liability Period shall extend for a period of twelve (12) calendar months from the date of Practical Completion. The Contractor shall include in his tender a separate price for twelve (12) months continued maintenance service for the period following the initial twelve month maintenance term. During the maintenance and defects liability period the Contract Plant shall be under the possession and control of the Owner but the Mechanical Services Contractor shall be in attendance for correction of defects, warranty repairs, and routine maintenance. (Also refer to technical specification.)

During the Maintenance Period the Mechanical Services Contractor shall:

• Carry out all maintenance and reporting as required by the New Zealand Building Code Handbook Compliance Schedules.

• Carry out all routine maintenance work necessitated by Statutory Regulations.

• Carry out all Planned Preventative maintenance work, routine servicing and cleaning in accordance with normal good trade practices, including replacement of consumables, filters and the like, to ensure that all installations plant and systems are in optimal operating condition. At the end of the Maintenance and Defects period, all consumables such as oil and filters shall be replaced so that the systems are in “as new” condition.

• Comprehensively inspect, test and adjust where necessary all controls, indications and alarms at weekly intervals, or as necessary.

• Correct any defects which may occur promptly and on a twenty four (24) hours a day, seven (7) days a week basis.

Planned Preventative Maintenance shall be designed to actively reduce the risk of reactive repairs and maintenance work and to absolutely minimise any unplanned disruption or risk of unexpected disruption to 100% operational use of facilities.

All maintenance is to be carried out with prior agreement of the owner, at times which cause minimum disruption to the building or occupants.

Equipment repaired during the last 6 months of the defects period shall have a further minimum 6 month defects period commencing from the date of completion of repair, or date of reinstatement. The Principal may engage others to rectify any faults, defects, and maintenance not rectified by the Contractor in an appropriate time or to an appropriate standard. The costs associated with this will be recovered from the Contractor.


The Mechanical Services Contractor shall provide an approved logbook kept by the Owner in which are recorded details of the inspection functions and all defects found and remedial actions taken. Each time an inspection is made, it shall be recorded with the name of the Mechanical Services Contractor’s inspector and details of inspections carried out and shall be signed by the Owner’s representative on completion of the inspection.

1.33 Practical Completion

A certificate of practical completion will be issued:

• On completion of the installation, and

• After all test adjustments and commissioning have been completed to the satisfaction of the Mechanical Engineer, and

• After draft Operation and Maintenance manuals and as-built drawings have been provided and approved by the Mechanical Engineer, and

• Provided all the requirements of the specification have been met to the satisfaction of the Mechanical Engineer.

1.34 Final Completion

Final completion shall be considered achieved when the Maintenance and Defects Liability Period has been satisfactorily completed and all specified requirements have been met to the Mechanical Engineer’s satisfaction.

1.35 Monetary Allowances

Any Provisional Sum Items mentioned in this Specification, shall be expended in whole or in part or not at all as may be directed by the Mechanical Engineer. No part of any Provisional Sum shall be expended nor is any commitment in respect of any part of any Provisional Sum to be entered into without the written authorisation of the Mechanical Engineer.

The attention of Tenderers is drawn to the Conditions of Contract and Special Conditions of Contract which shall govern expenditure under any Provisional Sum items and the agreement of variations.

1.36 Extra Payments

No extra payment in respect to overtime, additional materials, special conditions, and hardship or otherwise then included for in the Specification shall be claimed by the Mechanical Services Contractor unless such extra costs have been agreed by the Mechanical Engineer in writing before they are incurred.

In no case will extra payment be made on account of any temporary denial of access to portions of the work which may occur from time to time or any prolongation of the Contract period which may result from this or any other cause including the execution of extra works as part of the Contract.


2. Scope of Works

2.1 Preamble

Refer to the Preliminary and General Section of the Main Specification and to the General Conditions of Contract, which are equally binding on all trades.

All tenderers must read the Main Contract Conditions of Contract and the Preliminary & General clauses as these include requirements applicable to the Mechanical Services work.

2.2 Scope of Works

This contract shall include the detailing, supply, co-ordination, installation, commissioning and maintenance of the work summarised below. The Mechanical Services Contractor shall allow for all work necessary to provide complete and fully functional systems, including:

• Remove and dispose of any mechanical plant no longer required as part of the refurbishment works. Redundant plant should be first offered to owner before disposing of.

• Supply and install one new variable refrigerant flow (VRF) system complete with cassette heat pumps to serve all level 1 spaces and a ducted concealed unit to serve the ground meeting room. The system shall be complete with all associated refrigeration piping, BC control or splitter boxes, condensate piping, cabling, and controls.

• Supply and install a new roof mounted supply air fan ducted to deliver fresh air to level 1 office spaces not ventilated naturally. The system shall be complete with the fan, and all associated ductwork, filters, duct heaters, balancing dampers, diffusers, cabling, and controls.

• Supply and install a new locker area exhaust system complete with perforated metal grille, balancing dampers, ductwork, inline fan, bell mouth discharge with bird mesh, and associated wiring and controls.

• Supply and install a new inline supply air fan to deliver fresh air to the ground floor spaces. The system shall be complete with the fan, outside air louvre, plenum, all associated ductwork, filters, duct heaters, grilles, balancing dampers, diffusers, cabling, and controls.

• Supply and install a new inline extract air fan serving new toilets and locker area. The system shall be complete with the fan, discharge air louvre, and all associated ductwork, grilles, balancing dampers, fire damper, diffusers, cabling, and controls.

• Supply all door grilles as shown on the drawings (for installation by the Main Contractor).

• Provide and install all necessary drain piping and connections for air conditioning fancoils, to as nominated to drains discharging outdoors or to connection points provided by the Hydraulics subcontractor.

• Provide and install all electrical for mechanical systems and control systems including all power supply wiring, conduit, and associated cable support systems from the new mechanical services switchboard to the HVAC equipment.

• Provide hard wired interlocks from the fire alarm system to the new ventilation systems.

• Supply, install, fabricate, paint and erect all necessary miscellaneous items for proper functioning, commissioning and maintenance of all systems.

• Refer to the contract drawings for exact extent of works.

Associated with the above systems this Mechanical Services Contractor shall provide the following:

• Programme of sub-contract works and commissioning.

• Workshop drawings.


• Submission of proposed equipment (including manufacturers data and verification of static pressures, where necessary) for the Engineer’s approval (reselection at no additional cost will be required if the equipment submitted does not meet specification).

• Obtain approvals from authorities that have jurisdiction over the works and pay any associated fees.

• Sound and vibration isolation to ductwork and all equipment.

• Provision of ductwork, piping, cabling, and equipment support systems.

• Over flashing and weather proofing of roof cowls, fans, ductwork, cabling, and piping penetrations.

• Fire rating and sealing of pipework through firewalls and floors in accordance with the NZ Building Code.

• Seismic restraints for services plant and fittings to enable continued operation after a seismic event.

• Commissioning and testing of all plant installed in this sub-contract.

• Testing and demonstration of the mechanical services fire interface to the Engineer and Territorial Authorities.

• Labelling of the completed installation.

• Provision of Producer Statements and Certificates of Compliance for the completed installations.

• Provision of operating and maintenance manuals and “As-built” drawings.

• Instruction to Principal’s representatives on the Operation and Maintenance of all systems.

• Provision of minimum 12 months Warrantee and Guarantees from all manufacturers for all plant.

• Provision of 12 months Defects Liability following Practical Completion.

• Provision of preventative maintenance during the 12 month Defects Liability period.

2.3 General

The Mechanical Services Contractor shall supply and install heating and ventilation systems and piped services as specified.

The equipment and installation shall be in accordance with the NZ Building Code, NZS 4303, AS1668, and all other appropriate standard specifications and amendments and codes of practice listed in NZ Standard Association publications which are current at the time of construction.

The Mechanical Services Contractor shall confirm the exact location of all heating, ventilation, and air conditioning equipment, including grilles, diffusers, and roof outlets with the Project Manager prior to the start of any works.

2.4 Description of Systems

The systems covered by this Specification include the following:

2.4.1 General

The Mechanical Services Contractor shall supply and install new heating, ventilation, and air conditioning systems as specified.

The equipment and installation shall be in accordance with the NZ Building Code, NZS 4303, AS1668, and all other appropriate standard specifications and amendments and codes of practice listed in NZ Standard Association publications which are current at the time of construction.


The Mechanical Services Contractor shall confirm the exact location of all heating, ventilation, and air conditioning equipment, including grilles, diffusers, wall and roof inlets and outlets with the Construction Manager prior to the start of any works.

2.4.2 VRF Multi-Split Heat Pump Systems

One VRF (variable refrigerant flow), multi split heat pump system utilising or more modular linked outdoor air-cooled condensing units will be installed, and connected to multiple indoor ducted and ceiling cassette indoor fancoil units to provide heating and cooling to all areas. The systems will be capable of providing individual zone temperature control, simultaneous heating and cooling from adjacent indoor units, and heat recovery between indoor units.

The system will be enabled for operation via a central controller timeclock, and once enabled, will maintain temperatures as set on wall mounted thermostat/controllers located in each zone.

The outdoor condensing unit(s) will be located adjacent the building in the car park area on a concrete plinth provided by the Main Contractor.

2.4.3 Fresh Air Supply Ventilation

Fresh air ventilation in accordance with NZBC requirements will be provided to all areas.

Fresh air to the level 1 open plan offices, meeting room B, and the quiet room will be provided by a fresh air system consisting of a rooftop fan (SAF-1.1), inline filter (FIL-1.1), and inline electric duct heater (DH-1.1). Fresh air will be ducted to swirl diffusers complete with plenum boxes.

Fresh air to the ground meeting room and lockers will be provided by a fresh air system consisting of an inline fan (SAF-G.1), inline filter (FIL-G.1), and inline electric duct heater (DH-G.1). Fresh air will drawn in via a wall louvre and plenum box and ducted to side wall diffusers on the bulkhead and to the inlet plenum of the ducted fan coil unit. All plant to be accessible bulkhead, by others.

The electric duct heaters will operate as necessary to temper the incoming air and maintain minimum 15ºC supply temperatures in winter. The fan and heater will operate during scheduled building occupied hours as set via the central timeclock.

Fresh air make-up to WC areas will be provided via ceiling transfer grilles and connecting ductwork.

Transfer and relief air will be via door grilles, and door undercuts as appropriate.

2.4.4 Ventilation Systems

Toilets and locker area extract will be provided via ceiling exposed exhaust duct with side wall grilles to an inline fan (TEF-G.1) and discharge louvre.

Locker area extract will be provided via a perforated metal grille and air tight plenum (by others) above the existing lockers. Exposed exhaust ductwork and fan (EAF-G.1) to be connected to the plenum in the warehouse and discharge into the warehouse space via bird mesh bell mouth.

The fans will operate during scheduled building occupied hours as set via timeclock controller.

2.4.5 Controls System

The controls system will be a design-build package by the Mechanical services Contractor and their specialist Controls subcontractor, who will be responsible for the detail design, testing, and commissioning of a complete, integrated arrangement of manual and programmable electronic controllers to efficiently control the building services equipment installed under this contract. The controls systems provided will include all necessary components for efficient and effective operation and climate control.

All new equipment controls shall fully integrated via a new VRF central controller to enable remote monitoring, control, and adjustment.

The Mechanical Services Contractor shall be responsible for the installation including:

• Controls wiring to thermostats, sensors, controllers, switches and other components as necessary.

• Controls wiring, interface components, and connection to the VRF central controller.


• Assistance with testing, and commissioning of the services and controls systems, and fine tuning during the first 12 months of operation.

2.4.6 Electrical

A new Mechanical services distribution board (MSSB-1) will be provided in place of the existing board. The installation will include all electrical for mechanical systems and control systems including all power supply wiring, conduit, and associated cable support systems from the MSSBs to the HVAC equipment. All the existing HVAC plant not decommissioned will be installed onto the new board. The electrical system provided will be in compliance with the AS/NZS 3000:2007 Wiring Regulations, and as required for correct operation and protection of the mechanical services equipment.

2.5 Coordination with Other Services

2.5.1 By The Contractor(s) Responsible For Building Works

The following shall be undertaken by the Main Contractor responsible for Building Works:

• All coring, cutting, patching, trimming and making good of the building structure for the installation of cabling, piping, ductwork, cowls, fans and the like, provided the installation takes place in accordance with the building programme.

• Provision of approved under flashing and upstands for rooftop fans and cowls.

• Provision of concrete plinth for the VRF system outdoor condensing unit. Plinth to be sized as appropriate to achieve VRF manufacturer’s recommended clearances from the building.

• Provision of approved under flashings for ductwork, pipework, and cabling penetrating roofs or external walls.

• Provision of service access panels in ceilings and walls as identified by the Mechanical Services Contractor.

• Installation of door grilles provided by the Mechanical Contractor.

• Provision of bulkheads for concealed services.

• Provision of air tight plenums including pressure testing as noted.

• Provision of adequate structural support within walls and ceilings to accommodate HVAC equipment.

• Making good of building penetrations and surfaces affected by the demolition and removal of existing redundant HVAV systems. Weatherproofing of all associated exterior wall and roof penetrations.

• Access for the installation of equipment and provision of power for installation, testing, and commissioning.

2.5.2 By The Main Electrical Services Contractor

The Contractor responsible for Main Electrical Services Works shall include for provision of the following:

• Three phase, 50 Hz, 400 volt, 4 wire and earth sub-mains from the Main Switchboard to the mechanical services switchboard.

The Mechanical Services Contractor shall liaise with the Electrical Services Contractor to ensure that all electrical loads are coordinated.

2.5.3 By The Hydraulic Services Contractor

The Contractor responsible for Hydraulic Services Works shall include for provision of the following:

• Condensate drain connection points for HVAC equipment drains at central locations. Piping from HVAC drain connections to central connection points to be by the Mechanical Contractor.


2.5.4 By The Fire Protection Services Contractor

The Contractor responsible for Fire Protection Services Works shall include for provision of the following:

• Provision of wiring from the main Fire Alarm Panel to provide a fire signal to shut down the HVAC systems in a fire condition, and terminations at the MSSB for fire alarm signal wiring.

• Attendance during fire interface testing and demonstration to the Engineer and Territorial Authorities.

The Mechanical Contractor shall provide terminal blocks in the mechanical services distribution boards for fire alarm signal wiring, and a low voltage transformer to generate power supply for the signal circuit. Fire signal to mechanical plant to be provided by the fire alarm system opening the circuit via a relay within the Fire Alarm Panel.


3. HVAC Systems Technical Clauses

3.1 Design Parameters

The plant capacities are estimated based on the following design assumptions:

3.1.1 Outdoor Design Conditions

For Hamilton 2% (NIWA)

Winter: 2°C D.B minimum.

Summer 27°C D.B/ 22°C W.B maximum.

3.1.2 Fresh Air Supply

Offices: Power fresh air supply ventilation where not naturally ventilated (10 litres per person – offices as per NZS 4303/AS1668 requirements).

Staffroom areas: Natural Ventilation to NZBC G4 (Architect to confirm compliance).

3.1.3 Extract Ventilation

Toilet, shower, and cleaners room areas extract rate:

25 l/s/fixture or 10 l/s/m² floor area, whichever is greater, as required by AS1668 Table A1.

Lockers: 2.5L/s/m² as per AS1668.2

3.1.4 Noise Levels

Building services noise shall not exceed the recommended design sound levels provided in Table 1 of AS/NZS 2107:2000 as follows:

Type of Occupancy/Activity

Design Sound Level LAeq (dB(A)

Satisfactory Maximum

Office, administration, meeting, and conference areas:

35 40

Staff areas: 45 50

3.1.5 Internal Design Conditions

Air conditioned office, administration, meeting, and staff room:

Temperature: 22°C ± 1.5°C Summer

21°C ± 1.5°C Winter

Humidity: 40% - 70% (not directly controlled, but limited dehumidification available during cooling)

3.2 VRF Air Conditioning/ Heat Pump Systems

3.2.1 General

Air conditioning/heat pump systems shall be reverse cycle, inverter, VRF (variable refrigerant flow), multi split type, manufactured by Mitsubishi Electric, Daikin, Fujitsu, Toshiba, Hitachi, Panasonic, or other approved manufacturer.

The systems shall deliver high COP, with heat recovery available between indoor units, and utilise zero ODP R410 refrigerant.

Each system shall utilise outdoor air-cooled condensing unit modules supplying multiple indoor concealed ducted and ceiling cassette type fancoil units. The systems shall be capable of simultaneously heating and cooling from the indoor units, with heat recovery available between


units. The suggested Mitsubishi Electric City Multi R2 system achieves this using two refrigerant pipes and BC controllers. The alternative systems are three pipe arrangements and equally acceptable.

The VRF system controls shall be complete with interfaces and wiring connections to enable unit stop/start timeclock operation, monitoring, control, and setpoint adjustment from a building central controller. Refer to the controls section of this specification for further details.

The indoor and outdoor components of the systems and the interconnecting refrigerant pipework shall be installed by competent personnel under the supervision of the manufacturer or his agent.

Commissioning shall be completed by a specialist engineer approved by the manufacturer or his agent.

Full Pre Start-up checks before Commissioning shall be supplied to the manufacturer. These shall be completed fully and included supplied before booking the Commissioning time with the manufacturer.

The Contractor shall allow for up to 14 days to organise commissioning or assistance by the manufacturer. Full Pre Start-up checks before Commissioning shall be supplied to the manufacturer prior to their attendance. The Contractor shall allow for manufacturer’s charges as applicable for commissioning assistance.

The manufacturer shall provide a full 12 months parts and labour Warranty. The Contractor shall ensure that maintenance is carried out to a proven satisfactory level to maintain the manufacturer’s Warranty.

3.2.2 Outdoor Units

Outdoor condensing units shall be air cooled type, complete with controls to enable effective operation and automatic defrost in low ambient (0ºC) conditions. The units shall be constructed from steel plate and coated with a UV resistant durable paint finish.

Coils shall be provided with an appropriate corrosion protection film treatment suitable for extended outdoor service in a NZ environment.

The outdoor units shall each have two air-cooled heat exchange coils constructed from copper tubing with aluminium fins. The coils shall be arranged vertically with air being drawn in through the sides of the unit and discharged upwards via a single fan mounted on top of the unit. The fan shall be propeller type with safety guard, integral to the condenser frame. The coils shall be capable of being divided into sections to enable the outdoor unit capacity to match the capacity required by the indoor units.

The outdoor unit shall have inverter controlled hermetic screw or scroll compressor(s) capable of controlling the compressor in 1Hz increments.

Liquid sub-cooling shall be provided by a Heat Interchange Circuit (HIC), for effective refrigerant distribution and control with electronic expansion valves.

The refrigeration process of the outdoor unit shall be maintained by pressure and temperature sensors controlling solenoid valves, check valves and bypass valves. The heating or cooling mode of the outdoor unit shall be controlled by a valve that will reverse the cycle of the refrigerant to change the mode of the outdoor unit.

The outdoor unit discharge and return piping shall be fully insulated.

Outdoor condensing units shall be securely mounted by the Mechanical Contractor on the concrete slab provided and installed by the main building contractor. The Mechanical Contractor shall liaise with the main building contractor to coordinate and arrange appropriate equipment plinths.

3.2.3 BC Controllers

BC controller refrigerant control boxes shall be constructed from galvanised steel plate partially insulated with polyurethane foam. The base of the units shall have a foamed polystyrene drain trays.


BC controllers shall include a gas/liquid separator that will separate high-pressure liquid and high-pressure gas. A brass header block with three solenoid valves for each distribution port shall distribute the correct phase of refrigerant to each indoor unit.

BC controllers shall also include a heat exchanger that will recover waste heat from units in cooling operation and distribute this to units requiring heating. The opposite will happen in cooling operation.

The refrigeration process in the BC controllers shall be maintained by LEV’s (linear expansion valves) that will be controlled by pressure and temperature sensors.

The BC controllers shall be selected to have a number of distribution ports matching the number of indoor units it will be serving.

The BC controllers shall be selected to have a number of distribution ports matching the number of indoor units it will be serving, plus spare ports for at least two additional indoor units, complete with isolation valves and capped for future connection.

3.2.4 3-Pipe System Pipework and Heat Recover Change-Over Units (Alternate System)

Heat recovery change-over units shall be constructed from galvanised sheet steel.

Units shall include refrigerant expansion valves and PC boards, with suction gas and liquid port connections.

Final unit selection and configuration shall be completed by the equipment supplier to optimise pipe arrangements.

Each refrigerant piping system shall be designed with spare valved connections and piping sized to accommodate at least two additional indoor units, complete with isolation valves and capped for future connection points, and mains piping sized accordingly.

3.2.5 Indoor Units

The system shall have no more than the maximum of number of indoor units recommended by the manufacturer connected to one outdoor unit. The capacity of the outdoor unit should be as close as practical to equal the total capacity of the indoor units (100 to 110% max diversity).

Each indoor unit shall have a heat exchanger that shall be constructed from copper tubing with aluminium fins. The flow of refrigerant through the heat exchanger shall be controlled by a linear expansion valve installed within this unit. This valve is to be controlled by two pipe thermistors and a return air thermistor, and shall be capable of controlling the variable capacity of the indoor unit between 25% and 100%.

3.2.5.1 Ceiling Ducted Units

Ceiling void mounted air conditioning units shall be inverter split heat pump type complete with integral controls with auto-changeover between heating and cooling. Units shall have internal fan, refrigerant coil, condensate tray, and washable filter.

The units shall be manufactured from galvanised steel plate partially insulated with closed cell expanded polyurethane foam.

Air shall be discharged by a forward curved centrifugal fan horizontally out of the front of the unit to allow for field supply ductwork and diffusers to distribute the air into the room. Return air will brought in through a spigot connection at the rear of the unit.

All indoor units shall be supplied with a filter rack and washable media G3 filters, and shall be fitted with custom built filter/acoustic plenums on the return air connections of the units, complete with return and fresh air spigots and balancing dampers. The Engineer shall review and approve the construction of the filter plenums.

The whole unit shall be mounted on anti-vibration mounts and seismically restrained.

Provide flexible connections at all electrical connections.


Control for each unit shall be via hard wired wall mounted thermostat/controller including visual space temperature and temperature setpoint indication, as well as heat/cool and fan mode, and fan speed adjustment controls.

3.2.5.2 4 Way Discharge Ceiling Cassette Units

Ceiling cassette split system air conditioning units shall be inverter split heat pump type complete with integral controls with auto-changeover between heating and cooling. Units shall have internal fan, refrigerant coil, condensate tray, and washable filter. The units shall be manufactured from galvanised steel plate insulated with closed cell expanded polyurethane foam. The ceiling fascia panels shall be manufactured from ABS plastic.

Air shall be discharged by an aerofoil bladed centrifugal turbo fan through four outlets on the perimeter of the ceiling panel. The four outlets shall each include electronically adjustable vanes to alter the angle of the airflow. The room air shall be returned to the unit through one grille in the centre of the panel. The return air to the unit shall be filtered through a synthetic fibre washable filter installed in the unit.

The units shall have a condensate return pump or drain lift up mechanism fitted as standard.

Control for each unit shall be via hard wired wall mounted thermostat/controller including visual space temperature and temperature setpoint indication, as well as heat/cool and fan mode, fan speed adjustment, and airflow directional and sweep control.

3.3 Fans

3.3.1 General

The design duties as nominated in the Schedules have been calculated based on the ductwork sizes and configurations shown on the Drawings. Fan static pressures must be calculated by the Mechanical Services Contractor for any changes to ductwork configurations, making full allowance for all bends, offsets, louvres, grilles, filter losses (half dirty) etc. It is the Mechanical Services Contractor’s responsibility to ensure, prior to ordering, that all fans and motors proposed are correctly sized to provide the specified flows.

Submit certified fan characteristic, power and efficiency curves to Engineer for approval before ordering.

Fans shall comply with the maximum in-duct sound power level as specified in the schedules. Notwithstanding the above, they shall be quiet in operation and shall produce no objectional pure tones within occupied areas.

Sound power level data submitted are to have measured in accordance with BS 848: Part 2: 1985 Fans for general purposes-methods of noise testing.

Provide anti-vibration mounts for all fans. All moving parts of the fan shall be statically and dynamically balanced. Refer to Noise Control and Vibration Control sections.

Finish all steel fan casings with either hot dip galvanising or two coats primer, undercoat and gloss enamel top coat. A rotation direction arrow shall be painted on the housing fan.

3.3.2 Roof Mounted Extract Fans

Roof mounted general extract fans shall be of centrifugal or axial design as indicated in the schedules, with galvanised steel, aluminium, or FRP impellers. Units shall be a complete factory fabricated assembly with the weather cap, unit body and weathering skirt moulded in aluminium, or UV resistant fibreglass or injection moulded plastic, complete with birdscreen. Configuration of exhaust fans shall be down flow.

Fans shall be typically be selected with a direct driven, squirrel cage motor having non-overloading characteristics. Fans shall be dynamically and statically balanced and fan speed shall not exceed that specified.

Fans shall be sealed airtight to curbs using closed cell foam neoprene gaskets.


3.3.3 In-Line Fans

Large inline fans shall consist of a galvanised steel casing with aluminium or galvanised steel direct driven centrifugal or mixed flow impeller. Motors shall be complete with integral thermal protection and sealed for life ball bearings.

Smaller inline fans shall consist of an epoxy coated steel casing with an injection moulded plastic direct driven mixed flow impeller. Motors shall be complete with integral thermal protection and sealed for life ball bearings.

Provide flex duct connections from fan inlet and discharge spigots to ductwork to avoid potential duct resonance.

3.4 Electric Duct Heaters

Duct heaters shall be of the SmoothAir, Avon, Totaline, or equal manufacture.

Heaters shall be constructed and tested to NZS3102 and AS1668 Part 1.

Heaters shall be complete with galvanised steel casing, side control enclosure, elements, relays, and isolators. Heaters shall also be fitted with manual reset high-limit thermostat (cut-off temperature 82ºC), fusible link (rated to 121 ºC), and airflow proving sail switch.

Heaters shall be installed as per the manufacturer’s requirements.

Refer to the controls section of this specification for further details.

3.5 Air Filters

Filters shall be flat panel G3 washable woven media type filters with durable aluminium or plastic frames. Filters shall be provided with adequate support via wire or other backing provisions to prevent deformation and bypass when fully loaded.

Filter racks shall be fitted into expanded duct sections sized to achieve maximum 2.5 m/s velocity at the filters, and accessed via latched, hinged return grilles.

3.6 Louvres

Outside air louvres shall be manufactured by Holyoake Industries, Colt, or an approved equivalent.

The louvres shall be supplied by the Mechanical Contractor and installed by the Builder in locations where shown on the drawings and be painted to the colour approved by the Architect. Sizes of the louvers are indicated in the Equipment Schedules.

Each louvre shall be horizontal blade type, constructed from extruded aluminium with 100mm blades fixed at ends with stainless steel screws into a welded extruded aluminium frame. The bottom louver shall overlap the frame and the structure shall be designed to withstand a wind load of 95 kg/m2 (140 km/h).

All louvres shall be complete with bird screen mesh.

3.7 Ductwork and Fittings

3.7.1 Low Pressure Ductwork

All ducting shall be fabricated from galvanised sheetmetal and shall comply with the latest edition of Sheetmetal and Air Conditioning Mechanical Services Contractors National Association (S.M.A.C.N.A) Duct Construction Standards.

Ductwork shall be constructed to a minimum pressure classification of 500 Pa or the next higher class above the working pressure whichever is the greater.

Longitudinal snap lock seams are not acceptable.

All duct sizes shown on the drawings are air stream sizes (i.e., inside acoustic linings where these are used).

Turning vane assemblies shall be provided on all duct elbows and shall be constructed using proprietary vane runners such as Bullock, which shall be installed in accordance with the


manufacturer’s recommendations. Turning vane shape, spacing and maximum unsupported length shall be in accordance with the SMACNA requirements.

Radius bends with a centreline radius smaller than the duct width (r /w < 1.0), shall be provided with splitter vanes with the quantity as identified in the following table, and the spacing, construction and reinforcing as identified in the SMACNA manual. Vanes shall be accurately located to produce a uniform velocity or change of velocity in the various substreams, and shall not vibrate.

Ratio of C/L Radius to Duct Width r/w Number of Vanes Required

0.71 - 1.0 1

0.61 - 0.7 2

0.0 - 0.6 3

Transitions shall not have tapers exceeding 1 in 5 unless space conditions make this impossible.

Supply air ductwork shall be manufactured with shoe type fittings at all branch connections.

Spigot connections for circular ducts on supply air systems shall be 45º style or 90º with a single 100 mm long straightener mounted perpendicular to the airflow. Return and exhaust air circular spigots shall be 90º type without straightener.

Particular care shall be taken to make ducts air tight. After installation, all ducts shall be tested for air tightness.

Where ductwork is run outside the building all joints must be flashed and sealed to make completely water proof.

All small holes shall be brazed over, and all inspection and access plates shall be gasketted using “Unisil” sponge rubber gaskets at least 10 mm wide and 6 mm deep. Rivets shall be sealed with an approved fire resistant sealing compound. Self tapping screws are not to be used.

Any sharp edges, burrs and the like shall be removed. Stiffening flanges and support angles shall have their ends mitred to avoid accidental injury to personnel.

Ensure that all duct mounted fittings including dampers, fans, grilles, diffusers, etc., can be conveniently removed for servicing or adjustment and can, when in place, be adjusted and maintained.

Access panels shall be provided at all points necessary for inspection and maintenance of volume control and fire dampers, splitters, fans, filters (entering and leaving side) and at all other places where shown on the drawings and where necessary for plant adjustment. Inspection panels shall be located in positions which are conveniently accessible after installation. Obtain the approval of the Engineer for the location of any access panels where the accessibility is limited.

The following facilities for ductwork cleaning shall be provided:

• Easily removable ductwork and insulation sections at the top and bottom of all riser ducts, or

• 600 x 600 access panels

• Access panels shall be installed at 5 metre intervals along the length of all horizontal and vertical ducts.

All non-galvanised material is to be coated with metal primer paint before transport.

No ducts, or any items connected to or contained within ductwork shall vibrate so as to cause discernible noise or otherwise move.

Ductwork shall be delivered to site in a clean condition, stored away from the working area in a clean dry, and dust free environment, and protected from corrosion, damage, and contamination.

Internal ductwork surfaces shall be wiped clean prior to installation. Open ends of completed ductwork and overnight work in progress shall be sealed to prevent ingress of vermin or rubbish, except where solvent based sealants and cleaning materials have been used, where capping off should only take place after an appropriate curing period has elapsed, with consideration for


hazardous conditions as necessary. Prior to the installation of air terminal devices, any remaining protective end covers are to be removed. Dampers are to be left in the closed position by the ductwork contractor, to be opened by others during the commissioning stage.

Any contaminated sections of ductwork shall be thoroughly cleaned before fans are started. No fans are to be started until the building has been cleaned, and likelihood of construction dust being drawn into, and contaminating the ductwork and equipment has been minimised.

3.7.2 Volume Control Dampers

Provide dampers where directed and at all points required for the balancing of the air system. Single leaf butterfly type dampers may be used for duct branches with the largest dimension smaller than 350 mm.

Opposed damper blade dampers shall be Holyoake HCD - 150 or similar approved.

Manually operated dampers shall be provided with a visible indicating-locking type quadrant (Bullock manufacture or approved equivalent) with Open/ Closed positions and blade direction clearly identified on the adjustable quadrant which is mounted clear of the insulation surface.

Provide for 3 mm overlap of damper blades and provide a stop to the extreme damper blades. Where blades are 940 mm wide or greater, provide mullions (to approval) between the damper blade sections. The central bearings shall be either manual or motor operated if necessary to facilitate easy operation.

Where shown on the drawings, provide splitter dampers with external manual adjustment facility as described above. Splitter dampers shall be the full depth of the main duct in which they are installed.

Where spigots for flexible ducts are readily accessible they shall be provided with manually adjustable butterfly dampers complete with locking quadrants as described above.

3.7.3 Fire Dampers

Provide and install fire dampers where ducts penetrate fire rated shafts, firewalls, and floors where shown on the drawings. Fire dampers shall be Holyoake model IBD-B-V or similar and approved by all authorities having jurisdiction over the works. All fire dampers shall be provided with re-settable test latches to facilitate testing in accordance with AS 1856. The installation of fire dampers shall comply with the manufacturers’ recommendations and the requirements of AS 1668.

All fire dampers shall close automatically on fracture of the associated fusible link set to fuse at 71°C. Horizontal fire dampers shall be fitted with spring actuators. Fire dampers that are only one section high shall be sized so that when in the open position, the blades are located out of the air stream.

Fire dampers shall be fixed within proprietary mounting sleeves. The sleeve shall be fabricated and installed, in accordance with the fire damper manufacturers’ recommendations. Ensure that the manufacturers’ required clearance between the sleeve and the penetration is provided and stopped with Kao Wool or equivalent during installation. Ductwork connections to the sleeve shall allow the ductwork to collapse away leaving the damper intact in the event of a major fire.

3.7.4 Fire/Smoke Dampers

Provide and install fire/smoke dampers where ducts penetrate fire and smoke partition walls and floors as shown on the drawings.

Dampers shall be Holyoake model HFS-R-146 or similar, constructed to comply with AS 1682, and approved by all authorities having jurisdiction over the works.

Dampers shall be comprised of steel frame, opposed blade dampers, shafts, bearings and linkages, fusible link driven crank with constant force return spring, and 24V actuator interlocked to the fire alarm system.

All dampers shall be provided with re-settable test latches to facilitate testing. The installation of dampers shall comply with the manufacturers’ recommendations and the requirements of AS 1668.


All fire dampers shall close automatically on fracture of the associated fusible link set to fuse at 71°C. All smoke dampers shall close automatically on a signal from the fire alarm system.

Dampers shall be fixed within proprietary mounting sleeves. The sleeve shall be fabricated and installed, in accordance with the damper manufacturers’ recommendations. Ensure that the manufacturers’ required clearance between the sleeve and the penetration is provided and stopped with Kao Wool or equivalent during installation. Ductwork connections to the sleeve shall allow the ductwork to collapse away leaving the damper intact in the event of a major fire.

Fire dampers that are an integral part of a smoke extract system shall have the appropriate temperature rating.

3.7.5 Flexible Ductwork

Provide and install flexible ductwork where shown on the drawings. Flexible duct lengths shall be typically limited to 3.0m maximum length.

All flexible air conditioning system supply and return air ductwork shall be acoustically/thermally insulated with polyester blanket and wrapped in a polyethylene sleeve.

All flexible toilet extract ductwork shall be machine formed spiral corrugated and seamed aluminium, Holyoake Spiroset or equivalent. Ductwork shall have sufficient rigidity to hold shape and avoid reduction in internal dimensions under negative extract pressurisation.

Flexible ducts shall comply with the requirements of the NZ Building Code.

Under fire / smoke conditions the flexible ductwork shall comply with AS1668.1. The early fire hazard properties shall not exceed the following, when tested in accordance with AS1530.3:

• Smoke developed Index: 3

• Spread of flame Index: 0

The flexible ductwork shall be adequately supported by hanger straps from the building structure at intervals sufficiently close to prevent undue sagging of the ductwork and to prevent the weight of the ducts being carried by diffusers. Flexible supported on the ceiling, cable trays, pipework etc. will not be acceptable.

Flexible ducts shall be installed fully extended to avoid excessive air flow pressure drop. The minimum internal radius for bends in flexible ducts shall be equal to the duct diameter.

All bends, spigots, reducers, joins and adapters shall be constructed in strict accordance with the manufacturer’s instructions.

All flexible duct connections to spigots shall be secured using an approved tape and band clamps on the duct. On insulated ducts the insulation and polyethylene sleeve shall be drawn onto the spigot and the sleeve taped to the ductwork insulation to provide a vapour seal.

Joints between flexible duct sections shall use a beaded internal galvanised sheetmetal sleeve with the duct connections made in the same manner as connection to spigots.

3.7.6 Grilles and Diffusers

These shall be of the type, size and manufacture as indicated in the schedules, located where shown on the drawings, and painted as per the Architect’s colour requirements.

Diffusers and grilles of all types shall be adequately sized and braced to avoid vibration and noise caused by the passage of air through them.

Connections between grilles or diffusers, and ducts or framing shall be made air-tight with rubberised felt or sponge rubber packing glued to one face. No visible fixings shall be accepted unless specifically approved.

Opposed blade volume controls, operable from the grille or diffuser face, shall be provided for all systems which have multiple outlets and do not have accessible butterfly dampers located at the branch to the outlets or integral volume adjustment provisions on the grille or diffuser.


Provide boots or connecting boxes where the connecting duct or outlet branch size does not match the grille neck size. Coordinate box dimensions to fit within structure. Details shall be submitted for the Engineer’s approval.

Where the metal interior of the boot is visible through the grille, the boot interior shall be painted matt black.

All fixing bolts, nuts, washers and the like shall be galvanised or zinc plated. All threads shall be treated with copper cote anti seize grease before fastening.

3.7.7 Isolation of Ductwork from the Building Structure

Where ducts pass through structural ceilings, wall or floors, the size of the opening shall allow a clearance of not less than 10 mm all around the duct. A flange of 50 mm x 50 mm mild steel shall be riveted to the duct and fastened to the wall or floor with bolts or coach screws.

3.7.8 Duct Supports

Provide approved supports, brackets and seismic restraints which comply with the requirements of SMACNA and NZS 4219.

Rigid ductwork where the hanger length from the top of the duct to the structural support exceeds 200mm shall be restrained against seismic forces determined in accordance with the Standard.

Where typical strap hanger or threaded rod fixings alone cannot be demonstrated to provide sufficient seismic restraint, supplementary stainless steel wire tethers, Gripple or equivalent, shall be provided.

Horizontal ductwork above suspended ceilings or within bulkheads shall not be supported by the ceiling or bulkhead.

Supports on horizontal ducts shall be positioned at both sides of all changes in direction and at spacings not exceeding 2 metres. On vertical runs all ducts shall be secured at the extremities of the run, and at 2.5 m centres or less between extremities.

Mitre the ends of support angles and grind off sharp edges, and paint ungalvanised metal and zinc enriched paint applied over clean metal.

3.8 Air System Tests

The following tests shall be carried out by the Mechanical Services Contractor to the approval of the Engineer:

Check air flow quantities. These shall be within the range of 100% to 110% of the design figures with half dirty air filters. Allow for the provision of all holes necessary for measurement of air flow in accordance with BS1042. Test point holes shall be located with a minimum of 1 m of straight ductwork upstream and downstream where possible.

Visual inspection of ductwork and connections for air leakage at random points selected by the Engineer.

Carry out a systematic detailed check of noise levels using an approved octave band analyser. Demonstrate to the Engineer’s satisfaction that the noise levels specified are not exceeded.

3.9 Pipework

3.9.1 General

The Mechanical Services Contractor shall install all necessary refrigeration and condensate drain piping for the AC systems included in this contract.

Pipework for the various services shall be run in the materials specified under the relevant section.

The Mechanical Services Contractor shall be responsible for checking and ensuring that the pressure ratings of pipe materials and fittings are suitable for the maximum working pressure of the system concerned.


Open ends left at any time during the progress of work shall be blanked off with purpose-made metal plugs, plastic caps or blank counter-flanges. Pipework shall be kept free of dirt and other foreign bodies at all times.

Pipework shall be reamed after cutting and shall be free from burrs, scale and other defects and shall be thoroughly cleaned before erection.

Refer to the clause on Refrigeration Pipework for specific information.

3.9.2 Installation

The Mechanical Services Contractor shall design pipework layouts and routes, and allow for hangers, bends and off-sets to avoid conflicts with other trades, reducers, air vents, drain points and other fittings required to comply with the requirement of this specification.

Plan all layouts in conjunction with existing services and other trades especially Plumbing, Fire Protection and Electrical.

Unless otherwise directed, the bottoms of all horizontal pipes shall be at least 80mm above the floor. The clearance between pipework, walls and fixtures shall be at least 50mm.

Pipework shall be fitted at least 80mm (or further if required by the electricity supply authority) away from any conduit, cable or other electrical equipment.

Special care shall be taken in the arrangement of pipework to ensure a neat, economical and workmanlike appearance, true to alignment and grade. Horizontal lines shall, where practicable, be graded in the direction of flow.

Pipe runs shall be arranged as nearly as practicable to run parallel to building structural elements, walls, etc. and/or truly vertical. The grouping of pipes shall be such as to minimise crossovers and shall be co-ordinated in this respect so as to facilitate removal of sections of any systems.

Grade pipe systems for efficient venting and draining.

3.9.3 Schedule of Pipe Materials

Unless otherwise specified, pipes shall be manufactured of the following materials and to the following standards:

uPVC Drain Pipe NZS 7641,NZS 7642

Schedule of pipe material standards.

SERVICE SIZE MATERIAL

DRAIN < 40°C uPVC, polypropylene

Schedule of pipe materials.

3.9.4 Pipe Joints

Unless otherwise specified all pipe joints shall conform to the following specification.

Pipe Material Pipe Size Jointing Method

UPVC Pipework All Comply with Code of Practice NZS7643:1979 using fittings to NZS 7648. Avoid the over application of jointing cement.

Schedule of pipe joints.

3.9.5 Supports

Provide pipe supports to prevent pipe deflection and excessive stress, due to the weight of pipe, fitting and content, to be developed at, or transmitted to pipe joints and equipment.

Furnish hangers to support the required loads. Pipe hangers shall be in direct contact with uninsulated pipe of similar material or for, insulated pipes not requiring a vapour barrier.

Refer to Insulation section for support for insulated pipes.


Bolts for hangers and rails shall be placed before pouring of concrete wherever possible, otherwise they shall be Dynabolts or equal expanding types.

Anchors and guides shall be positioned to ensure that all expansion is taken up without distorting the pipeline.

Support pipes from substantial building structure. Any pipe supports, which are insecure, in the opinion of the Engineer, shall be removed and the building surface made good at the Mechanical Services Contractor’s expense.

Pipes shall not be hung from other pipes, ducts or plant and equipment such as air handling units. Continuous screwed rod shall not be used for hanger rods of over 200 mm in length.

Pipe hangers shall be of galvanised steel or of brass. Hangers shall be adjustable for height, and shall be of proprietary manufacture to the approval of the Engineer, except as noted below. The Mechanical Services Contractor shall provide detailed drawings and a sample of every kind of hanger of his own manufacture for approval by the Engineer. Brass or copper pipe clips may be used for copper pipes.

Spacing and hanger rod size for pipe supports shall be in accordance with the following Table:

uPVC Pipe

Hanger rods size same as steel pipes.

Horizontal spacing - as per manufacturer’s recommendations.

Vertical spacing - as per manufacturer’s recommendations.

Proprietary pipe hangers shall be Unistrut galvanised of type as appropriate.

uPVC Pipe support specifications.

3.9.5.1 Horizontal Pipe Support

Unless otherwise specified, clamp hangers shall be suspended on swivel cage with spherical washers.

Types of pipe supports shall be in accordance with the following Table:

Services Pipe diameter (mm) NB

Type of Support

Drain All sizes Clamp

Pipe diameter and support specifications.

3.9.6 Pipe Sleeves

Provide pipe sleeves where pipes pass through walls, floors, ceilings and roof. Pipe sleeves can be omitted when pipes pass through internal walls and formed openings are provided.

Pipe sleeves at non fire rated partitions shall be PVC pipe section. Pipe sleeves shall be of such a size that an annular clearance of 7mm can be maintained between the pipe and the sleeve. The sleeve shall be flush with the partition on either side. The annular space between pipe sleeve and pipe shall be caulked with fibreglass. Provide sealing plates at both sides of partition to seal in fibreglass.

Pipe sleeves for metal pipes in fire rated partitions shall be galvanised steel pipe with a minimum wall thickness of 1.6mm and of the same size as for non fire rated partitions. The annular space between pipe and sleeve shall be caulked with ceramic fibre rope. Pipe insulation section penetrating at fire rated partition shall be protected by an approved intumescent material. For PVC pipes, the pipe penetrations shall be protected by approved intumescent fire collars.

Escutcheon plates, to the approval of the Engineer, shall be provided where pipework passes through walls, floors and ceilings which are visible in spaces.


3.9.7 Thermal Expansion

All pipework shall be installed with adequate provision for thermal movement to prevent stress to be developed at pipeline, joints, compression or capillary joints in particular, and equipment to which pipework is connected.

Allow adequate provision to absorb thermal stresses by means of loops or off sets. Cold stress all such loops and off sets by ½ of the calculated thermal movement, and provide effective anchors on one side. Obtain the approval of the Engineer in all such cases.

3.9.8 Pressure Testing Procedure

Pressure test all pressure pipes to one and a half times of their maximum working pressure.

Drain pipes shall be tested with running water and visually checked for leakage.

Hydraulic testing to the pressures given above shall be carried out to the approval of the Engineers who may require to witness any or all of such tests.

3.9.9 Condensate Piping

The Mechanical Contractor shall detail and install a condensate drainage system for each heat pump indoor unit in accordance with manufacturer’s specifications and applicable plumbing codes. The Mechanical Contractor shall coordinate drainage reticulation and connections with the Main Contractor and Hydraulic Services Subcontractor.

Condensate drains shall be piped through the exterior walls to discharge outdoors nominally 200mm above grade, or into condensate drainage connection points provided by the Hydraulic Services Subcontractor to the sanitary drainage system, or to the nearest kitchen/ toilet/ cleaner’s room and connected into the plumbing waste pipework at an appropriate location, above the trap seal of a plumbing fixture drain. Provide all necessary sealing and flashings to complete durable weatherproof installations at all exterior penetrations.

The Mechanical Services Contractor shall provide all condensate reticulation piping and connections from HVAC equipment to the agreed connection points.

Condensate pipes shall be at least the size of the unit drain spigot connections. Allow for minimum 1:80 min falls to drain by gravity from each unit drain connection.

3.9.10 Refrigeration Piping

3.9.10.1 Installation

The installation of all air conditioning equipment, installation of all refrigerant pipework and full commissioning shall be performed by a specialist refrigerant installer who shall be authorised by the manufacturer to install their equipment (Certificate of approval must be submitted prior to commencement on site).

The installation should be as per the manufacturer’s recommended practice piping procedure for R410a. Full access shall be afforded to manufacturer’s staff to attend site to verify that installation methods are fully in accordance with the manufacturer’s requirements and that the equipment warranties will not be invalidated.

3.9.10.2 Refrigerant Pipework

Supply, install, test and commission all interconnecting refrigeration pipework between the outdoor and indoor units.

Refrigeration piping connecting separate items of packaged air conditioning equipment shall be sized and installed in accordance with the manufacturer’s instructions and shall include oil traps at the base of gas risers and at the recommended intervals up the riser. Each site-installed refrigeration circuit shall include a filter/dryer, sight glass/moisture indicator.

All refrigeration pipework systems shall comply with the requirements of AS1677.2. Submit calculations upon request from the Engineer.


All pipework to be carried out in refrigerant quality soft/medium drawn copper tubing to BS2871 Part 2: 1972 and AS 1571 “Copper - Seamless Tubes for Air Conditioning and Refrigeration”, and complete with the appropriate pipework joints.

Suction lines shall be graded 1 in 100 in the direction of gas flow.

Filter dryers in reverse cycle units shall be of the bi-directional type.

Copper tubing used for R410A refrigeration pipes shall have minimum wall thickness as shown in the following Table:

Outside Diameter (mm) Wall thickness (mm)

6.35 0.80

9.52 0.80

12.70 0.80

15.88 1.00

19.05 1.00

22.22 1.00

25.40 1.10

28.58 1.10

34.92 1.10

41.28 1.25

53.97 1.65

66.67 2.00

79.37 2.50

88.90 2.50

92.07 2.50

104.80 2.50

Pipe wall thickness specification.

Annealed copper tubing, if used, shall be straightened to display a neat appearance. Tubes may be bent to a mean radius not less than three pipe diameters. Flattening of the pipe at bends shall not exceed 12.5% of diameter. Soft (coil) copper shall not be used for sizes 19.05 OD and greater. Hard drawn copper tube shall be used for suction lines greater than 10 metres in length.

Fittings such as elbows, tees, reducers, couplings, etc., shall be manufactured from wrought copper and have capillary type connections. Elbows shall be long radius. Fittings shall be Hudson, Heldon or approved equal.

Longest possible lengths of copper pipe should be utilised to minimise joints on site.

Joints in copper pipe shall be brazed. Brazing shall be carried out to the requirements of the HVCA Code of Practise – Brazing and Bronze Welding of Copper Pipe and Sheet. Join lengths of pipe using capillary fittings, or swage the end of one pipe to form a capillary joint with the adjoining pipe. Braze or solder joints using suitable fluxes and Silver alloy hard solders complying with AS 1167 and having not less than 5% silver.

Appropriate refrigeration installation tools must be utilised. Dry Nitrogen (OFN) must be utilised at all times in the system during brazing.

Use standard manufactured devices to fix pipes to the structure. Protect pipes against chafing at clamp locations by wrapping with PVC tape or other approved methods.

Pipework shall be properly fixed and supported at a minimum of 1.5 metres centres and where required should be run on galvanised trays. All pipework to be labelled with ID number (condensing units ref.) at 3 metre intervals.


Daily pressure tests of all pipework with dry nitrogen at 300kpa is to be completed to ensure no leaks are found. Final pressure testing after installation of pipework, and prior to sealing of insulation joints and starting of equipment, pipework should be pressure tested to 4150kpa held for 24 hours and checked for leaks prior to evacuation.

Triple evacuation procedures must be carried out as per “Recommended Practice Piping Procedure R410a”.

Refrigerant (R410a) charge weight must be calculated, to the actual installed length of pipework in accordance to manufacturer’s recommendations.

The charging should be carried out with an appropriate charging station.

Use standard manufactured devices to fix pipes to the structure. Protect pipes against chafing at clamp locations by wrapping with PVC tape or other approved methods.

3.10 Thermal and Acoustic Insulation

3.10.1 Ductwork Internal Thermal and Acoustic Insulation

All supply diffuser and return grille cushion head/plenum boxes shall be internally insulated.

All ducted split heat pump system supply and return air plenums shall be internally insulated.

Thermal/Acoustic linings shall comprise minimum 25 mm thick, fibre retardant fabric faced, bonded glass fibre rigid insulation board as shown on the drawings.

The insulation system shall achieve zero fibre migration.

Max thermal conductivity shall be 0.034 W/m.K at 10ºC mean.

Density Thickness Sound Absorption Coefficients

125 250 500 1000 2000 4000 Hz

24 kg/m³ 25mm 0.12 0.32 0.70 0.93 0.95 0.99

Internal insulation acoustic performance specification.

Internal insulation shall be fixed at a maximum of 400mm centres with plastic pins and 32mm diameter washers.

Insulation pins shall be glued to the side of the ducts.

Insulation shall extend the full width of the duct without joints.

The edge of the insulation at the end of each duct section or where spigots or duct branches connect shall be thoroughly glued to prevent erosion of the glass fibres.

Where air velocities greater then 9m/s or where excessive turbulence is expected acoustic insulation shall be lined with perforated galvanised metal.

All internal insulation longitudinal seams and transverse joints shall be capped.

Internal thermal and acoustic linings shall be manufactured from materials which do not support combustion. Insulation shall have a spread of flame index of 0 and a smoke developed index not exceeding 3 in accordance with AS 1530 Part 3.

3.10.2 Ductwork External Thermal Insulation

External thermal insulation is required on the following except where acoustically lined:

• All ducted heat pump conditioned supply and return ductwork, casings, and plenums.

• All fresh air supply ductwork upstream of electric duct heaters.

No thermal insulation is required for fresh air ductwork downstream of electric duct heaters, or for extract ductwork.

No insulation shall be installed until the work has been proved to be air tight.


Thermal insulation shall comprise minimum 25 mm thick, glass fibre blanket duct wrap flexible insulation, with factory prebonded heavy duty foil facing.

Max thermal conductivity shall be 0.036 W/m.K at 25ºC mean.

All joints shall be sealed using adhesive foil tape, 75 mm wide, to provide a continuous seal. Provide bandit straps at 1000mm centres and either side of bends, tees etc. to hold the insulation in place.

External thermal insulation shall be manufactured from materials which do not support combustion. All external insulation shall have a maximum rate of flame spread as defined under Class 1 in BS 476.

All removable or opening parts such as access panels shall be insulated such that the item can be removed or opened without damage to the insulation or finish.

3.10.3 Refrigerant Piping Insulation

Insulate suction and liquid line piping with 13mm minimum thickness insulation having a spread of flame index of 0 and a smoke developed index not greater than 3 in accordance with AS 1530 Part 3. The insulation shall have an effective vapour barrier.

Armaflex or equivalent Pair coil pre-insulated piping systems would be acceptable.

In addition, all exposed outdoor refrigeration piping and cabling shall be encased in a UV resistant plastic sheathing such as flexible conduit to prevent weathering damage to the piping insulation.

3.10.4 Condensate Piping Insulation

Insulate all condensate pipework within 3m of fancoil drain tray connections, and all condensate pipework above finished ceilings. Insulation shall be 13mm Armaflex or equivalent, with an effective vapour barrier.

3.11 Sound and Vibration Control

3.11.1 Sound Control

3.11.1.1 General

Noise from mechanical services should be free of tonal and spectral content, and not exceed the levels stated below when measured at a distance of 1.2 m above floor level, and 1.5 m from any grille, diffuser, louvre or plant room wall. Continuous noise level criteria are expressed in terms of Noise Criteria curves (NC) and should be measured and assessed in the octave bands 31.5 Hz-8 kHz.

Sound pressure levels shall be measured at a distance of one metre from air inlets, or extract air grille.

Refer to 3.1.4 for Design Noise Criteria.

3.11.1.2 Equipment Noise

The Mechanical Services Contractor is to ensure that all plant and equipment provided is of such design, or is satisfactorily isolated by acoustic treatment and suitable mounting arrangements, so that the sound level performance data for all manufactured equipment does not exceed manufacturer’s figures.

Noise or vibration from operating equipment shall not be discernible in an occupied area outside a plant room. It is to be ensured that all installed equipment operates at a noise level compatible with its immediate surroundings, in a non-occupied area.

Should noise levels exceed those specified due to plant or equipment generated noise exceeding manufacturer’s figures, the Engineer may require the Mechanical Services Mechanical Services Contractor to replace or modify the plant or provide additional acoustic treatment at his own expense to comply with the noise criteria required.


3.11.1.3 System Noise

Generated air stream noise is to be kept in all cases to a minimum. In no case is the noise level measured either within an occupied space one metre at right angles from the face of any grille or diffuser to exceed an the specified noise criteria rating with the associated air system operating.

Strict precautions shall be taken against all fluid noises from pipe systems, in particular against water-hammer, excessive operation noise of automatic valves, relief valves and check valves and noise resulting from excessive pipe velocities.

The Mechanical Services Contractor shall rectify any systems subject to noise attributable to defective installation practice, at no extra charge to bring the levels in affected areas to those specified. Strict attention is to be paid to smooth duct interior surfaces and the best practice in duct construction and the design and fixings of dampers, splitter and similar duct fittings.

3.11.1.4 Grille Noise

Grilles shall comply with the maximum sound power levels indicated on the equipment schedules. Notwithstanding the above, they shall be quiet in operation, and shall produce no objectionable pure tones within occupied areas.

Grille face velocities shall not exceed those implied in grille schedules on the relevant drawings. Every care is to be taken to ensure a smooth streamlined flow through the grilles.

3.11.1.5 “Cross-Talk” Between Rooms

The Mechanical Services Contractor shall provide any necessary additional acoustic treatment required at no extra charge, to eliminate this defect where attributable to installation practice.

3.11.1.6 Acoustic Treatment and Attenuation of Air Ducts

This shall be affected as and where shown on the drawings. Special attenuation methods and all acoustic and thermal insulation details are included in the Contract Drawings and/or elsewhere in the Specification.

All flexible ductwork shall be acoustically lined flexi-duct. Balancing splitters shall preferably be used over opposed blade dampers, and shall be followed by at least three duct diameters of duct before the discharge grille.

3.11.2 Vibration Control

General

Provide anti-vibration isolation for all plant. Anti-vibration mountings shall be designed for the plant to which they are applied to give a maximum force transmissibility, either in the vertical or in the horizontal plan, to the supporting structure of 10%. Mountings shall be located about the centre of gravity of the supported load so that equal deflection occurs on all mounts.

Provide manufacturer’s calculations for the selection of all anti-vibration mounts for each plant item.

Where specified the inertia of supported plant shall be increased by the addition of reinforced concrete inertia blocks. Such blocks shall be structurally stable, and shall have a minimum thickness as shown on the drawings.

Where flexible pipework of either rubber or copper braided type is specified the length of such pipework measured between adjoining solid pipework faces shall equal at least three (3) diameters of the solid pipework.

Isolate all ductwork and fittings attached thereto from supports with 6 mm thick neoprene hangers. Where ductwork passes through building works provide 5 mm thick approved fire resistant sealant around the ductwork for the full perimeter and axially over a length equal to the width of the building component plus 25 mm each side.

The installation details shall be designed to ensure that there is no transmission of objectionable vibration or structure- borne noise to the building and occupied spaces.


Attention shall be given to the installation of plant and equipment to ensure there is no transmission of excessive tactile or audible vibration to the building due to the operation of machinery or equipment and/or its connection to ductwork or conduits.

Rotating Equipment

All rotating parts of equipment shall be balanced statically and dynamically to balance quality grade G6.3 according to ISO 1940-1973 Balance Quality of Rotating Rigid Bodies.

All rotating equipment or equipment which contains rotating parts or equipment which produces objectionable vibration shall be isolated from the building structure via anti-vibration isolators as detailed in the appended schedule. Inertia bases may be required for machines with large, out of balance forces, such as internal combustion engines, air compressors reciprocating refrigeration compressors, pumps and high pressure fans.

Balancing and alignment of fans shall be rechecked on site after installation by an approved firm and a report forwarded to the engineer. All necessary rebalancing and adjusting shall be carried out, prior to final acceptance of the equipment.

Pipes and Conduits

Electrical wiring connected to rotating equipment should be in a looped form and not connected via rigid conduits which may short-circuit vibration isolators.

Provide flexible pipework connections to plant.

Where flexible pipework of either rubber or copper braided type is specified the length of such pipework measured between adjoining solid pipework faces shall equal at least three (3) diameters of the solid pipework.

Isolator Description

All rotating equipment or equipment which contains rotating parts or equipment which produces objectionable vibration shall be isolated from the building structure as shown in the following schedule. All mounts/isolators shall be sized and located to ensure they achieve the specified deflection under the static load of the machine. Levelling screws should be fitted to all mounts and isolators.

All spring mounts or associated plant items shall have seismic limit stops fitted so that any horizontal or vertical movement is limited to 12 mm before striking a limit stop. The limit stop shall have at least 6 mm of resilient material fixed to the contact surface. Seismic limit stops shall have a clear air gap between limit surfaces of at least 4 mm under normal operation of the machine to be isolated.

Calculations shall be provided for the selection of all anti-vibration mounts for each plant item.

The accompanying vibration isolation schedule lists the isolation type and minimum static deflection required for each item of plant.

Equipment Vibration Isolation

Equipment Design Deflection Isolator Type

Ducted split heat pumps suspended from lightweight steel structure

18mm Hanger with steel spring

Ducted split heat pumps suspended from heavyweight rolled steel members or concrete structure.

Ceiling cassette heat pumps.

VRF system outdoor condensing units.

0mm No requirements

3.12 Electric Motors

3.12.1 General

All electric motors shall comply with BS4999 and shall be AEI, Crompton Parkinson or other approved manufacture.


Extract fans specified as having speed control shall be provided with motors rated for installation with variable speed drives.

Motor bearings shall have sealed ball or roller bearings sealed.

Unless otherwise stated, all drive motors shall be of TEFC construction employing Class E (NZS1536:1961) insulation.

Motors shall be continuously rated and shall be suitable for 3 phase operation (400, 50Hz, 3 phase). Smaller drives (below 1kW) may employ single phase motors (230V, 50Hz)

Single phase motors shall be supplied complete with capacitors for power factor correction.

All single phase motors shall be provided with inherent thermal cut-outs to prevent over-heating of motor windings.

Thermistor protection shall be installed in the stator winding for all motors rated at 15kW or over. Provide a minimum of three thermistor probes in single wound stator and six probes in multiple wound stator motor in positions recommended by the manufacturer. Where thermistor protection is incorporated it shall be wired to separate terminals within the motor terminal box.

Class F insulation shall only be used when thermistor winding protection is employed in conjunction with suitable protecting gear complying with BS4999 Part 111:1987/NZS/AS 1023.1:1985, set to operate at not more than 1200ºC.

All motors shall be fitted by the manufacturer/Mechanical Services Contractor to ensure correct initial adjustment and alignment of the drive.

Mechanical equipment driven by electric motors which are not part of an integral design, shall be supplied with motors of a power rating not less than the following:

Fans: Catalogue absorbed power plus 30%

Heat pumps and all other equipment:

Catalogue absorbed power plus 20%

3.13 Controls

3.13.1 General

The controls system shall be a design-build package. This section describes generic system requirements and performance criteria as appropriate. The controls system provided shall include all necessary components for efficient and effective operation and climate control.

The Mechanical Services Contractor shall be responsible for the detail design, installation, testing, and commissioning of an integrated arrangement of programmable electronic controllers to efficiently control the building services equipment.

All new HVAC systems are to be connected to the existing time clock controller in DB13. New hard wired wall controllers shall be provided for all new standalone split systems.

New building services equipment associated with this contract includes:

• 1 x VRF heat pump system

• 2 x fresh air fans

• 2 x electric duct heaters

• 1 x WC extract fan

• 1x locker area extract fan

Equipment for the automatic control of the VRF system shall be by the VRF system manufacturer. Miscellaneous HVAC controls shall be Corel, Eurotec, Honeywell, Schneider, Siemens, or equivalent manufacture.

The Mechanical Contractor, in cooperation with the equipment suppliers shall be required to:


• Engineer the control system in accordance with the guidelines given in this Specification.

• Develop the sequences of operation outlined in concept in this Specification, and provide all necessary controls programming.

• Install the control systems.

• Controls wiring to thermostats, sensors, controllers, switches and other components as necessary.

• Verify all points, test sequences of operation, and commission the system.

• Maintain the system as described in the Specification.

• Guarantee the complete control system.

• Provide on-site training of the Client’s staff.

• Attendance during the 12 months maintenance during the Defects Liability Periods, including assistance to the Mechanical Services Contractor to fine tune the controls system and set up trend logs to monitor operation of the system.

The suppliers of the control equipment shall be required to guarantee that the control system installed can satisfy all control requirements, and within the tolerances as specified. All subsequent alteration and adjustment to meet the specified requirements shall be at the Mechanical Services Contractor’s and supplier’s expense.

Controls shall be of electronic type and shall be complete with sensors, actuators, and all ancillaries to achieve automatic, optimised stable environmental conditions as specified.

All set points, proportional bands, integral time constants, delays, etc., shall be fully adjustable from the operator interfaces. In addition the controls must be configured and programmed such that damage to plant due to failure of components is prevented.

3.13.2 Sensors and Controllers

All sensors and controllers shall be of best commercial standard and quality, suitable for installation and function in an uncontrolled environment. (I.e. 5-35ºC and 20-95%RH)

The response time of the controller shall match that of the system so that a stable condition can be achieved without overshooting beyond limits or hunting between limits.

Calibrate and adjust all controllers on site after installation.

3.13.3 Switch and Sensor Locations

Switches and space temperature sensors shall be generally wall mounted, 1500mm above the floor and directly above light switches where these are provided. Sensors shall be located in protected locations, not subject to direct sunlight and insulated from the exterior wall panels. Final locations shall be coordinated and approved by the Architect and Engineer.

3.13.4 Time Clock Schedules

Separate timeclock schedules shall be provided in the VRF central controller. The central controller shall be capable of up to 4 additional timeclock schedules to allow the owner flexibility to programme separate schedules for different department areas.

During programmed “unoccupied” periods equipment shall be switched off to conserve energy.

Hours of operation shall be initially as follows: (but shall be adjustable parameters on the time clocks, and shall be finally set as requested by the building operators).

8:00 AM - 6:00 PM Monday to Friday

8:00 AM - 1:00 PM Saturday and Sunday

3.13.5 Fire Alarm Shut Down

All new HVAC system equipment shall be hard wired to shut down in the event of a fire condition, and shall re-start when the alarm has been cleared.


3.13.6 Pushbutton Timers

Pushbutton timers shall be PDL 648TM in 681VH plate or equivalent, and shall be programmed for 1 hour equipment operation. The timers shall be complete with a neon indicator light to show when the equipment has been energised. One push shall energise equipment for the programmed period and the light shall glow. A second push when equipment is already energised shall cancel the timed period operation, shut off equipment, and shut off the indicator light.

Two local pushbutton timers, located adjacent to the thermostat/controller in the waiting area and in the ground meeting room shall provide one hour timed operation of the VRF-1 heat pump system, and associated heat fresh air fans, electric duct heaters, and WC extract fan. Provide an engraved self adhesive label above the timer “VRF-1 After-Hours HVAC Operation”.

The ground meeting room fancoil system shall normally be “off” during building occupied hours, unless manually energised via the room pushbutton timer. The fresh air ventilation system to the ground meeting room and lockers shall operate under normal timeclock control. When the push button is pressed after hours the associated fresh air fans (SAF-G.1), electric duct heater (DH-G.1), shall also be energised. Provide an engraved self adhesive label above each of the timers “1 Hour HVAC Operation”.

Alternately, after-hours operation or boardroom HVAC timed activation via the local VRF system indoor unit wall controllers will be acceptable.

3.13.7 VRF System Heat Pump/Air Conditioning Units

The system operation is described below in principle only, the VRF system manufacturer shall provide a fully coordinated control system to deliver efficient and effective control of the system.

Indoor heat pump units shall be provided with thermostat/controllers to provide individual operating and temperature control in each space. Local thermostat/controller connections shall be extended via LAN to a central controller located adjacent to MSSB-1 which shall provide timeclock schedules, temperature and operation monitoring, override adjustment and limiting of setpoints, on/off control of the associated building fresh air and extract systems, and external input interlock for fire alarm HVAC system shut-down.

Heat pump units shall be enabled for operation on a signal from the central controller timeclock (or after hours override). Once enabled, the indoor units shall operate as set on their local controller and the VRF system shall operate under its own integral controls, with fans, compressors, reversing valves etc staging and modulating as necessary to maintain space conditions.

3.13.8 VRF Individual Room Controllers

Simple controllers shall be wall mounted and hard wired to the individual indoor VRF heat pump units as shown on the drawings. Controller casings shall be manufactured in ABS plastic with an LCD display and shall be the manufacturer’s standard off-white colour.

Controllers shall be capable of altering the following functions:

• On/off

• Operating mode

• Set point

• Fan speed

• Vane directional controls for ceiling cassette units

Temperature adjustment at the local controllers shall be limited to ± 3ºC, and operation parameters shall be able to be overridden and reset from the site central controller.

3.13.9 VRF Centralised Controller

A centralised controller complete with power pack shall be mounted adjacent to MSSB-1 and hard wired to the VRF system outdoor units. It shall be manufactured in ABS plastic with an LCD touch screen display and will be the manufacturer’s standard off-white colour. The controller shall be capable of individually controlling the following functions on up to fifty indoor heat pump units:


• On/off

• Operating mode

• Set point

• Fan speed

• Timeclock settings

• Fault diagnosis

The controller shall be capable of on/off controlling the building heat recovery ventilator fans, fresh air fans, electric heaters, air curtain, and extract fans in accordance with the system timeclock and afterhours pushbutton settings.

The controller shall include provision for an external input/output to interlock the HVAC systems to shut-down on receipt of a fire alarm signal from the fire protection system.

The unit must be capable of energy monitoring in future, but this can be by expansion module, and is not a requirement of the base building specification.

3.13.10 Ventilation Systems

Office building fresh air supply fan (SAF-G.1 & SAF-1.1), WC extract fan (TEF-G.1) and extract fan (EAF-G.1) shall be on/off controlled in accordance with the VRF-1 system central controller timeclock schedule. The ventilation fans are intended to operate anytime the VRF system has been activated, either by timeclock or pushbutton after-hours timer.

3.13.11 Electric Duct Heaters

The fresh air supply ducts shall be fitted with inline electric duct heaters (DH-G.1 & DH-1.1), enabled to operate when the associated fresh air fans are running.

Provide duct discharge temperature sensors and controls to stage the heater elements on/off as required to maintain minimum 15ºC (adjustable) fresh air discharge temperatures.

The electrical power supplies to the heaters shall be hard wire interlocked with the associated ventilation fans such that the failure of the power supply to the associated fan automatically interrupts the power supply to the heater.

High-temperature thermostats of the manual reset type shall be installed with the sensing element of the thermostat located within the heater casing or discharge from the heaters. The thermostats shall operate when the air at the heater outlets reach a temperature of 70ºC and shall de-energize the electric heater.

Air flow switches shall be installed for each heater which shall interrupt the electric power supply to the heater independently if the normal airflow through the heater stops but the other protection devices fail to operate.

3.14 Electrical For Mechanical Plant

3.14.1 General

The electrical for mechanical system shall be a design-build package. The Mechanical Contractor shall be responsible for the detail design, supply, installation, testing and commissioning of a complete electrical system for the mechanical services in compliance with the AS/NZS 3000:2007 Wiring Regulations, and as required for correct operation and protection of equipment. All electrical installation work shall be done by qualified personnel, in compliance with current wiring regulations, code requirements, and any site specific electrical requirements.

The Mechanical Contractor shall be responsible for all power supply wiring and controls for the individual heat pumps, fans, and heaters installed under this contract. The mechanical contractor shall provide power wiring connections to the equipment, and shall include all necessary controls, switches, contactors, relays, starters, local isolators, plugs and sockets.

Electrical information is provided in the equipment schedules to assist tenderers. Where the Contractor selected equipment differs from the loads listed, the actual loads shall be used for


compiling the tender price. Actual loads to be confirmed by the Contractor prior to ordering panel equipment.

All cables shall be multicore TPS or PVC. They shall be sized on a maximum of 2.5% VD, and on a maximum of 0.8pf. 20% spare current capacity shall be provided within the VD and pf limits. Calculations shall be provided on request.

Main isolators shall be sized on a minimum of 115% of the circuit protection carrier size.

All motors larger than 5 kW shall be provided with reduced current starters such as star/delta. Motors smaller than 5 kW shall be provided with DOL starters.

The mechanical contractor shall supply a Certificate of Compliance for the electrical works associated with the mechanical contract.

3.14.2 Scope of Works

The scope of work the sub-contractor shall provide shall include the following:

• Provide and install a new mechanical services distribution board (MSSB-1) adjacent to the main electrical distribution boards in the ground meeting cupboard, with all correctly rated miniature circuit breakers (MCBs) required to serve new and existing mechanical plant. Three phase 400V 4 wire and earth sub-mains power supply cabling will be provided by the Electrical Contractor from the main electrical switchboard and left to be terminated at main isolators of the mechanical services switchboard.

• Connect to MCBs and provide power cabling for all new HVAC equipment and controls.

• Provide 415 VAC 3 phase mains supplies for the VRF heat pump system outdoor unit(s).

• Provide 240 VAC mains supply for each VRF system indoor unit and BC control box (if not fed from outdoor unit).

• Provide 240 VAC mains supply for the fresh air supply and WC and locker extract fans.

• Provide 415 VAC 3 phase mains supply for new electric duct heaters.

• Provide all necessary local switches, starters, plugs and sockets.

• Provide local isolation switches adjacent to each heat pump, fan, and electric heater.

• Provide wiring for HVAC controls as specified, and coordinate with any controls subcontractor that may be engaged.

• Provide and install all cable support systems and cable tray as necessary to ensure that all cabling to equipment is fully supported.

• Connect a fire alarm relay signal from wiring extended (by others) to the MSSB for mechanical services shut down under fire conditions. Test and commission the entire installation to prove shutdown.

• Test and commission of the completed electrical installation.

• Provide instruction/training to Principal’s representatives on the Operation and Maintenance of all systems.

• Prepare As Built panel drawings, wiring schematics, and electrical layout drawings.

3.14.3 Mechanical Services Switchboards

3.14.3.1 General

Mechanical distribution boards to be supplied by an approved switchboard manufacturer. The board shall include the following:

• Main isolator

• Main power supply run light


• Lamp Test switch

• Fire alarm test switch

• Starters

• Interface relays/contactors

• MCBs for all mechanical equipment

• Keyed alike to the electrical switch board

• Matching in colour to the main electrical switch board.

Provide all other components that may be necessary for the automatic control of the system as agreed with the Engineer.

All power wiring between the distribution board and plant shall be provided and installed by the Mechanical Services Contractor. It shall be the responsibility of the Mechanical Services Contractor to connect all such wiring to his equipment and provide circuit breakers etc. to connect to the distribution boards.

Ensure that the physical size of the distribution board and components are such that placement in final position on site is possible. Provide arrangement and construction drawings for review by the Engineer before commencing manufacture.

Particular care is to be taken to ensure that adequate cable termination space is provided.

The complete distribution board shall comply with NZS 6107 and to New Zealand Electricity Act 1993 and all amendments.

3.14.3.2 Rating

All electrical equipment shall be continuously rated for ambient temperatures of up to 35ºC.

The switchboard bus bars, circuit breakers and fuse switches shall be rated for 11 MVA withstand for 1 second.

The switchgear shall be suitable for use on a 400 volt 3 phase and neutral, 50 Hz M.E.N. system.

Controls, protection and alarms - 24 VAC

Anti condensation heaters - 230V single phase 50 Hz.

3.14.3.3 Essential Features

The switchboard shall be designed to ensure satisfactory operation in which continuity of service is the paramount consideration, and to facilitate convenient operation.

It shall be designed to eliminate the risk of accidental short circuits and to exclude vermin and insects.

Every reasonable precaution shall be incorporated for the safety of personnel in operating and maintaining the switchboard. Live contacts on overload units and ammeters shall be shielded.

Adequate ventilation shall be provided on enclosed cubicles to prevent condensation and for the removal of heat.

The switchboards shall be GAEL or equal manufactured by an approved manufacturer specialising in the design and manufacture of switchboards. The switchboard shall be manufactured, assembled, wired complete internally and tested before delivery to site.

The Engineers shall be given the option of inspection of the completed switchboard before delivery.

A dimensioned outline drawing showing the proposed layout of fittings and equipment shall be submitted for the Engineer’s approval before fabrication commences. Typical switchboard layouts may be varied to suit manufacturer’s standard design provided the essential requirements are complied with.


3.14.3.4 Construction

All cubicles shall be of the sheet metal, enclosed type, fitted with side hinged doors, and quick acting latches. Maximum width of any cubicle door shall be 600 mm. They shall be folded 1.6 mm quality baked enamel finish internally and externally. Internal colour is to be white, and the external colour is to match that of the main electrical switch board.

Bus bars and connected circuits shall be capable of carrying continuously a total load equal to the rated capacity of the incoming isolator without the temperature rise of any component mounted with or on a fuse board exceeding 20°C above ambient temperature.

Ensure that adequate terminal space is provided on neutral bars and adequate wiring space is provided between fuse boards and ceiling and floor spaces to enable the addition of 25% of the circuits initially installed.

Provide an allowance of 25% spare physical space within the switchboard for future additions

Boards 10 Way or more shall have a duct box provided at the point(s) of cable entry to reduce cabling within the remainder of the board.

All metalwork shall be bonded to the earth bar and starred washers shall be used to provide earth continuity between adjacent steel surfaces.

Boards visible to the public shall be flush or semi-recessed unless approved otherwise by the Engineer.

No handles shall protrude beyond the front cover/door.

The metalwork on the complete distribution board shall be thoroughly cleaned of all rusting, degreased and primed with zinc chromate.

All mechanisms likely to rust shall be cadmium plated or otherwise rust proofed.

The distribution board shall be manufactured by an approved manufacturer. The name of the proposed distribution board manufacturer shall be submitted at time of tender.

3.14.3.5 Bus Bars and Connections

Bus bars and connections thereto shall be fully insulated and shall comply with NZS 211 and shall be identified in accordance with NZS 273.

Bus bars shall be sized in accordance with Table 38 M of the New Zealand Electrical Wiring Regulations as applicable. They shall be capable of carrying the continuous rated current without a temperature rise above ambient of 20°C.

Clearances as specified in NZS 211 shall be maintained when a current equal to the specified short circuit rating is flowing in the bus bars and connections, and must be capable of withstanding the specified test voltages. Bus bars shall be rated at minimum current rating as indicated on drawings and braced to withstand fault levels which can be safely cleared by the section isolators.

3.14.3.6 Neutral and Earth Bars

These shall comply with NZS 1998.

These shall be constructed of copper or brass of size equal to phase bus bars.

Neutral and earth bars shall be provided with purpose made tunnel type terminations sufficient for all connections with 25% spare.

In addition, terminations shall be provided for incoming neutral and earth cables of sizes on the drawings or as required by the New Zealand Wiring Regulations, together with a removable link connecting the neutral and earth bars.

3.14.3.7 Circuit Breakers

Circuit breakers shall comply fully with NZS 2205 including all amendments/sections.

Circuit breakers shall have a minimum category of duty M6, with instantaneous release under fault conditions.


All circuit breakers shall be of the trip free hand closing type with mechanical trip buttons.

Breakers shall be fitted with mechanical position indicators.

All circuit breakers shall be fitted with locking tags to enable the circuit breaker to be locked in the open position for isolation purposes using a pad lock.

Spare MCBs shall be fitted, as indicated.

3.14.3.8 Fuses

All fuses including those used in fuse switches shall be HRC to Class AC80. All fuse links shall have a fusing factor not exceeding 1.5 i.e. Class Q1 to NZS 160. Links with higher fusing factors may in special cases be used for circuits protecting motors (i.e. motor-rated fuses) only with the approval of the Engineer.

Five spare fuse links of each size and type shall be provided in a purpose made metal holder inside cubicle doors for each distribution board and in the case of physically larger fuse links (i.e. 100A) in a suitable separate cubicle.

Provide all spare fuse bases as indicated.

3.14.3.9 Contactor and Motor Starters

Contactors shall comply with BS 5424 Part 1, 1977 Category AC-3 with making and breaking capacities given for AC3 in Table 2 thereof and Class 1 intermittent duty. No contactor having a rating of less than 15 amps shall be used.

Contactors shall have easily removable coils and contacts.

ALL MOTOR STARTING CONTACTORS shall be fitted with three (3) phase overload and genuine single phase protection of the thermal type and hand reset suitable for the protection of CMR motors. All overload protective devices shall be matched to the protected motors. All two speed fan motor starters shall be mechanically and electrically interlocked to Engineers approval.

All contacts shall operate without discernible noise and shall be fitted with 230 volt coils except where noted on the drawings. Contactors shall be Sprecher and Schuh or equal.

In the case of electrical equipment that is remotely controlled, devices shall be provided for emergency stopping the motors at all points where danger is likely occur.

Each electric motor shall be provided with a means to prevent automatic restarting after stopping due to drop of voltage or failure of power supply.

3.14.3.10 Relays

All relays shall be of best quality with contacts rated for a continuous duty of minimum 10 amps. They shall be encased in thermetically sealed enclosures and shall be free from discernible noise when energised. Auxiliary contacts shall be self cleaning. Timing relays shall be provided with adjustable delay periods as shown on the drawings. Relays shall be OMRON plug in make unless otherwise stated.

3.14.3.11 Isolators

Every distribution switchboard shall be provided with effective means of isolation by a single rotary type switch isolator. All live side terminals of these switches shall be shrouded to prevent accidental contact.

Isolators shall be rated for the continuous load current and for the maximum fault duty which may be reached. Isolators shall not be smaller than the sizes shown on the drawings. Microgap isolators may not be used.

Isolators shall be capable of being locked in the open or closed position. Isolators shall comply with BS 5419 for AC 23 duty.

3.14.3.12 Selector Switches

Rotary selector switches shall comply with the requirements of the IEC 337-1.


3.14.3.13 Controllers, Thermostats, Valve Actuator Motors and Sensors

These shall be as indicated on the drawings. Install to manufacturers requirements and allow for all necessary liaison with manufacturer/supplier to ensure correct connection and installation of equipment before livening of distribution board, and to ensure correct operation of the system.

3.14.3.14 Indicating Lamps

All indicating lamps shall be of Sprecher and Schun or equal manufacture and shall be fitted with bezels coloured as shown on the drawing. These shall be of the press to test transformer type.

Provide six (6) spare lamps of each type used which shall be stored in a purpose made compartment in the switchboard.

3.14.3.15 Panel Wiring

All wiring is to comply with Regulation 48 of the Wiring Regulations. Insulation colours shall be:

Red: Red phase connection in current of voltage transformer circuits.

Yellow: Yellow phase ditto.

Blue: Blue phase ditto.

Black: 230 volt neutral circuits.

Green: 230 volt insulated earth circuits.

Wires are not to be joined or teed between terminals and, at the incoming cable end, shall be terminated on strips of Klippon Polyamide or equal approved.

Provide segregation between LV and ELV outgoing terminals.

Wiring to doors shall be anchored at the panel side and sufficient length is to be provided to enable the door to swing fully open without strain on cabling.

All wiring is to be number ferruled using proprietary type cable markers.

All outgoing control/controlled field wiring is to be brought out to terminals mounted at the top of the panel to facilitate ease of termination.

Termination of all wiring at these terminals is to be effected using pre-insulated crimp type pins of the correct size to suit cable and terminal capacity.

All wiring within distribution boards for the operation of instruments, protective devices, pilot lights, etc. shall be run in slotted plastic ducting.

Panel cabling, especially cabling to heavy loads such as motors, shall be installed such that the surface temperature of cables does not exceed 300C. Cabling to outgoing terminals for such loads shall be sized to Appendix G of the New Zealand Electrical Wiring Regulations for unenclosed situations and comply with the spacing distances given, otherwise the derating factors shall be applied.

3.14.3.16 Earthing

Bond all metalwork to main earth bar. Bond all hinged panels with braided flexible copper.

Earthing conductors shall be as specified in EWR 1976.

Bond all cable sheaths, and earthing conductors to earth bar. Use compression type conductor lugs for all earth connections with bolted joints. Ensure that all connections are tightened.

Earth continuity shall not depend upon metal to metal joints. For panel earthing use starred washers between screw and panel.

On earth bar provide brazed studs suitable for direct bolting on of all major earthing connections.

The earth and neutral bar shall be located well clear of incoming cables and other connections.

3.14.3.17 Labels

Panel labels shall be provided to describe the operation of all devices to the Engineer’s approval.


Labels shall consist of black lettering engraved on white traffolyte. Lettering shall be 6 mm high.

Each cubicle shall be provided with an engraved black and white designation label, and a typed or stencilled chart mounted inside the door giving full particulars of all circuits controlled. Cover chart with 1.6 mm clear perspex fixed on a rigid frame. The chart shall show all circuit numbers and the location of circuit outlets.

All labels shall be fixed with chromium plated or stainless steel screws. Pop rivets are not acceptable as fixing for labels.

Phases shall be identified by phase colours.

Provide a plan pocket within the distribution board for the insertion of “As Installed” drawings.

Provide “As Installed” drawings for those plan pockets.

3.14.3.18 Power Factor Correction

Power factor correction capacitors shall be provided by the Mechanical Contractor within the main mechanical services switchboard as necessary to achieve a minimum total mechanical plant equipment power factor correction factor of 0.95.

3.14.4 Junction Boxes

Junction boxes shall be of the waterproof polycarbonate type to IP56 protection.

Terminals shall be of Klippon (polyamide) type, mounted on the base of the junction box. Boxes shall be sized so that 60 mm clear space is provide between the box wall and the terminals.

All cable entries shall be bushed to provide a water and insect proof seal.

All terminals and wires shall be number ferruled in accordance with the wire numbers given on the workshop drawings.

All junction boxes shall be identified by code numbers which shall be reproduced on the record plan layout, cabling and wiring diagrams.

3.14.5 Equipment Isolation and Final Connection

Provide isolating switches beside equipment and in compliance with the NZ Wiring Regulations. Isolators shall be capable of being locked in the open position, and shall be as follows:

3.14.5.1 HVAC Equipment

Isolators shall be mounted adjacent to the equipment and shall be of the PDL 56 series type or as otherwise stated. Final connections shall be carried out in PVC cables enclosed in PVC sheathed flexible metallic conduit.

Termination at motor terminals shall be via pre-insulated crimp type lugs.

Wiring within plant rooms/plant areas shall be enclosed in super high impact PVC conduit.

3.14.5.2 Control Sensors, Motorised Valves, Etc.

Final connection to these shall be via junction boxes as above and flexible cables terminated using pre-insulated crimp type lugs. Watertight glands shall be used for cable entry into the junction boxes, motors, sensors etc. Minimum size of flexible cable is 0.75 mm2.

3.14.6 Cabling Methods

3.14.6.1 General

Provide all cabling required, run in single layers and identified as to function at terminating points.

All cabling shall be installed in a manner which permits its convenient withdrawal and replacement. No cable shall be cast directly into concrete. In such areas install cables in conduit or ducting. Draw wires shall be installed in conduits or pipes where necessary for later cable installation.

After installation but before connection, all cables shall be tested for insulation resistance using a 500 V tester for 230 V circuits and a 1000 V tester for 400 V circuits.


Sharp edges to steel or sheetmetal shall be removed and such work shall be arranged to avoid accidental injury to personnel, or damage to insulation.

Provide insulating bushes at all points where cables enter metal enclosures.

On no account shall plastic sheathed cables be run in any situation where timbers have been treated or likely to be treated with tar-oil, creosote or allied products.

Wiring which supplied equipment liable to overheat and cause rapid deterioration of the wiring, shall have the tails made off, (with heat resisting sleeves to protect the permanent wiring), in a conduit box fitted with terminals and mounted adjacent to the fitting or equipment. Then run heat resistant cabling from the box.

Cable size for power cabling shall be calculated in terms of AS/NZS 3008 for site conditions and shall take into account maximum permissible voltage drop on equipment startup. Minimum cable size for power cabling shall be 2.5mm².

3.14.6.2 Cable Support Methods

The Contractor shall supply and install all items necessary to form a complete network of cable supports for the exclusive support of all electrical services cabling. The shared use of cable supports shall only be permitted with written permission from the Engineer. This shall include the following:

• Cable ladder / tray along all main cable routes.

• Conduit along all secondary cable routes

Prior to installation of cabling and cable support structures in all areas, co-ordinate with all other trades to confirm compatibility of proposed routes.

Cable support structures shall be installed truly vertical or horizontal and parallel with the major axis of the building.

Cable support systems installed for the use of electrical 230V power cabling shall be installed a minimum of 300mm from cable support systems installed for the use of communications/fire/security cables.

Where cable support systems pass through fire rated partitions all holes shall be back filled with appropriate fire rated filler after the installation of all cables to reinstate the fire rating integrity of the partition.

Where cable support systems pass through external partitions all holes shall be back filled with appropriate water proofing compounds after the installation of all cables to provide a permanent watertight seal.

3.14.6.3 Wiring in Conduit

No diagonal runs of conduit shall be permitted.

Threads on conduits shall not be exposed after screwing into fittings. Metal conduits which shall be set into concrete shall be minimum 20 mm heavy gauge galvanised steel, cleaned of rust, and with any damage to galvanising painted with galvanising paint before concreting in. Metal conduits set into concrete likely to be damp (such as outside walls) shall be given a second coat of galvanising paint. Conduit boxes in concrete shall be zinc plated and have the threads protected with grease during the building construction.

Conduits shall have not less than 40 mm cover of concrete with deep conduit boxes used if necessary. On no account shall conduits be run partially embedded in concrete or plaster.

Earth wires sized to comply with regulations shall be run to all conduit power outlets.

Steel conduits shall be made off into boxes, trunking DBs etc. with locknuts, sockets and male brass bushes.

All conduits shall be adequately sized so that any cable can be withdrawn and replaced at a later date. Provide draw-in boxes where necessary for this purpose at maximum 10 m intervals.


Where conduits are run near hot water pipes there must be at least a 150 mm and in the case of cold water and other services at least 50 mm clearance between the conduit and such pipes. Conduits shall be screw fixed to frame works with conduit saddle or metal clips of adequate section.

All conduit runs shall be complete and shall be swabbed out before wiring is installed.

Conduit runs shall be complete before any cables are pulled in.

Plastic conduit shall be as made by Rex Conduit Limited or equal and installed in accordance with the manufacturers recommendations. Use welded joints at all connections and use springs for making sets. Ensure that adequate provision is made for thermal expansion using the Manufacturers expansion joints. Super high impact grade shall be used unless stated/requested otherwise.

Conduit to be “cast in” shall be completely sealed to prevent the ingress of concrete and slurry.

Elbows and tees shall not be used.

Bends and conduit boxes shall be used where necessary.

3.14.6.4 Tough Plastic Sheathed Cables

Where TPS cables pass through walls and floors, or in plaster, concrete or where they otherwise may be subject to damage or abuse, they shall be adequately protected. No cables shall be set solidly in concrete or plaster.

Where cables enter metal-clad apparatus such as switchboards etc., the holes shall be properly bushed.

No through joints shall be permitted on straight runs.

Where cables are required to run concealed in timber framed construction they shall be run so that there is no danger of damage to the cables from subsequent nailing of linings, etc. Horizontal runs in walls are not permitted unless there is no alternative.

3.14.6.5 Types of Cables

Cables used on this Subcontract shall comply with the following:

PVC and TPS Insulated: NZS 6401

UG PVC: NZS 6401 with heavy sheath for underground use

PVC NS PVC: NZS 6401

PVC SWA PVC: BS 6346

XLPE: BS 5467, AS 3198

MICC: AS 3187, BS 6207

Pyrolex or Radox cable can be used in place of MICC cabling subject to approval from the engineer.

Cables shall be cleated at centres not exceeding:

For TPS and PVC: To Table 5 of the NZ Insulated Cables Wiring Regulations

For Conduit: 600 mm horizontally, 900 mm vertically

The radius of cables shall not be less than the values specified in Table 4 of the NZ Wiring Regulations.

No ordinary grade PVC insulated cables shall be run in any location where the temperature is likely to exceed 450C. No high temperature grade PVC shall be run in locations where the temperature is likely to exceed 750C.

On power circuits terminate conductors using normal good practice. Where connection is made to bolted terminals use pressure crimp lugs.

On control panels cable tails shall be left of sufficient length to reach any terminal.


Surplus cabling shall be neatly laced with plastic button tape. All tails shall be identified with number ferrules to correspond with associated cables on the panel side of the terminal.

3.14.6.6 Cable Tray and Trunking

Provide all necessary cable tray and trunking to support cables. Cable tray and trunking shall be equal to that manufactured by HMF or Burndy. All tray runs shall be continuously earthed.

Cable tray shall be galvanised. Cable tray should be stood off the wall on Unistrut galvanised spacers, brackets, or suspended from the ceiling on purpose made angle iron brackets galvanised after fabrication. Maximum spacing of brackets and hangers shall be 1.2 metres.

Provide all necessary cable tray droppers to plant and equipment. Provide all necessary liaison with Electrical Services Contractor.

All runs of tray shall be continuously bonded and earthed.

All tray run on walls shall be spaced with suitable spacers to allow nuts to be fitted.

Untreated surfaces exposed after manufacture through cutting to size, length etc., shall be repaired by the use of two coats of metallic zinc rich priming paint.

Powder coated tray/trunking may be used.

3.14.7 Earthing

The whole of the earthing shall comply with the New Zealand Electrical Wiring Regulations, the requirements of the Local Supply Authority, and site specific requirements.

All switchgear, control panels, distribution boards, cable trays etc., shall be solidly earthed with conductors sized in accordance with Table 26 of the Wiring Regulations. Bond all water pipes, tray, and trunking.

3.14.8 Labelling and Marking

Identify all items with a white engraved laminate label with black lettering fixed by two screws. Screws shall be cadmium plated or stainless steel.

A schedule of labels shall be submitted by the Mechanical Services Contractor for approval.

The requirement for labels includes but is not limited to the following:

Switchboards, distribution boards, control panels, items on control panels, switches, sockets, controllers, isolators, items inside control panels, including relays, contactors, starters, motors and all similar.

Labels shall indicate circuit number, or origin of supply and in the case of isolators, the equipment they supply.

All cables shall be appropriately labelled at both ends with the appropriate cable number. In the case of this project, many of the existing cable number will be able to be reused.

3.15 Corrosion Prevention

Make every reasonable attempt to limit corrosion and in particular avoid contact between dissimilar metals in wet or damp situations.

Contact between copper and steel is permitted only in closed circuits. Water that has been in contact with copper shall not pass over aluminium or galvanised steel. Metals shall not be placed in direct contact with concrete except where steel has been cast in for hangers or supports. Eliminate pockets that could hold water.

Fastenings shall have equivalent or better corrosion resistance than the materials joined or supported.

All fixing materials used external to the building shall be non-ferrous or hot dip galvanised. Building paper is to be interposed between adjacent faces of ferrous and building surfaces. Plant and fixing shall be designed so they are self draining and cannot retain water on external surfaces. Small openings in metalwork shall be filled with non-setting mastic sealant to avoid retaining moisture.


3.16 Galvanising

All steelwork and fixings where specified as having a galvanised finish shall be galvanised by the hot dip process, providing a continuous thickness of zinc coating not less than 0.08 mm. All drilling, punching, cutting and bending shall be completed and all burrs removed before galvanising. At the option of the Engineer samples of galvanising selected by the Engineer shall be tested to BS 729 or 443 as applicable. All breaks in galvanising shall be coated with approved zinc enriched paint applied over bright metal.

3.17 Provision for Seismic Movement

The complete system as installed by the Mechanical Services Contractor shall include provisions to minimise damage in the event of earthquake. The recommendations of NZS 4219 shall be strictly followed, and the Mechanical Services Contractor shall be responsible for providing detailed shop drawings for equipment supports and restraints approved by a qualified structural or seismic engineer, with associated PS-1 and PS-4 certification.

Particular attention shall be paid as follows:

• Ductwork suspended more than 200mm below structure shall be restrained in accordance with NZS 4219.

• Grille and diffusers and associated plenum boxes shall be suspended from structure and restrained in accordance with NZS 4219.

• Inline duct mounted equipment shall be independently suspended from structure. Inline duct mounted equipment with operating weight greater than 10 kg shall also be supported and braced laterally.

• Gripple or equivalent stainless steel wire tethering systems may be considered acceptable for lightweight ductwork and equipment where compliance with NZS 4219 can be demonstrated.

• Where plant items are to be mounted on anti-vibration mountings, the mounting arrangement shall be designed to permit the displacement resulting from operation of the plant, but shall prevent the plant from being thrown off the mountings when subjected to earthquake movement.

• All plant fixings, holding down bolts and pipe hangers shall be designed in accordance with NZS 4219 and shall be subject to the approval of the Engineer.

• Bracing, brackets and fixings shall be to the Engineer’s approval prior to fabrication. The steel sections and fixings shall be selected to comply with NZS 4219. The structure to which the bracing is fixed must be of sufficient strength to withstand the seismic forces specified in NZS 4203 and the approval of the Engineer shall be sought when locating bracing points.

3.18 Oil and Lubricants

The Mechanical Services Mechanical Services Contractor is to provide all lubricants required by the Works during the Contract period.

A complete schedule of recommended oils and other lubricants for all Contract Plant is to be furnished with the Operating and Maintenance Instructions.

Where lubrication is effected by grease, nipples shall be provided by the Tecalement “Tat” type, piped to an acceptable position, and a matching grease gun is to be provided.

3.19 Identification

Provide white traffolyte labels with nominal 6 mm high black engraved lettering to provide permanent and legible identification for fans, heat pumps, and the heat recovery unit. Identifications labels shall be fixed to equipment, and also on the wall above the associated equipment controllers and switches.

Equipment designations as in the equipment schedules are to be used, eg “Fresh Air Supply Fan SF-1”.


Labels for ceiling and above-ceiling mounted equipment to be fixed to the ceiling grid adjacent to the units. Heat pump indoor and outdoor units to be provided with labels fixed to the unit casings.

Provide similar labels for operating controls as detailed in Section 3.17 - Controls.

All identification is to be readily visible from a normal servicing position.

3.20 Commissioning, Inspection and Testing

Test, balance and commission the complete system installed under this contract in accordance with the requirements as outlined in this section.

A Certificate of Practical Completion for the Contract Works shall not be issued by the Project Manager until the Engineer has been satisfied with the results of all tests, balancing and commissioning associated with that phase of the Contract Works.

Inspection or tests by the Engineer may be required on any item during or after their construction at the Manufacturer’s works.

Produce sample test sheets for Approval/Review for all services installations to enable a full Testing/Commissioning Record to be made. Complete all tests and commissioning of all Services Installations and record all results. Allow the Construction Manager, the Local Electrical Supply Authority and other relevant local bodies the opportunity of attending and witnessing the tests and commissioning. Include the following in the test procedures:

• Allow for any attendance and/or equipment required.

• Employ the suppliers of any specialist equipment installed, to test and commission that equipment.

• Provide all necessary instruments, technicians and allow for all costs associated with the testing, balancing and commissioning including all fees to external agents and local authorities where required.

Power and fuel will be provided by the Construction Manager.

Prior to all testing, the Mechanical Services Contractor shall carry out all preliminary balancing, adjustment and control setting.

The acceptable commissioning procedures shall be as recommended by CIBSE or ASHRAE.

All final tests shall be witnessed by the Engineer’s representative. Notice of final testing shall be given to the Engineer at least four (4) workings days prior to the test. Included in the notice shall be proposals on the method of testing, the instrument used, with calibration certificate of the instrument to be used, with calibration certificate of the instrument dated not more than three months from the date of the final test, the name of the personnel supervising or actually carrying out the test, and the results of preliminary test.

The Engineer reserves the right to reject any or all of the above proposals. In this case, the Mechanical Services Contractor shall resubmit the proposal for consideration and shall be responsible for all the delay so caused. In is important for the Mechanical Services Contractor to discuss the complete programme and procedure of all testing, balancing and commissioning with the Engineer in advance in order to avoid any unnecessary delay.

The final results of all tests, balancing and commissioning shall be recorded by the Mechanical Services Contractor in the format as directed and included in the Operating and Maintenance Manuals.

3.20.1 Testing

Check complete installation visually for compliance with the Specification. Continuity and insulation resistance checks on all wiring and cabling shall be completed. The Mechanical Services Contractor shall ensure sensitive equipment is disconnected prior to test.

Check all labelling.

Check fixings of all equipment and systems installation to ensure stability under possible seismic conditions. Provide written test results to obtain approval of the Local Supply Authority.


3.20.2 Ductwork

Low velocity ductwork shall be visually inspected for joint leakage. The Engineer reserves the right to require further testing at the expense of the Mechanical Services Contractor should it be deemed warranted.

3.20.3 Motors

Check and test all motors with regard to insulation resistance, direction of rotation, loading, overload settings, fusing, and correct operation of any other protection equipment.

3.20.4 Balancing

Measure air flow rate, fan speed, pressure across fan and motor operating current.

Record all balancing results in a format approved by the Engineer.

3.20.5 Commissioning

After all systems have been fully tested and balanced, the Mechanical Services Contractor shall commission the complete system in the presence of the Engineer’s representative. The commissioning records shall be signed off by the Engineer’s representative.

Witnessing of the commissioning shall not proceed until the Engineer has been given a copy of the results of the preliminary commissioning completed by the Mechanical Services Contractor.

Commissioning shall include the following recommended procedures and also those of the equipment manufacturers, CIBSE and ASHRAE guide:

Operate all equipment under a loaded condition to ensure that there is no undue noise and vibration.

Measure the actual equipment performance and check operation of all safety devices.

3.20.5.1 Fans:

• Air flow rate (balancing results).

• Pressure developed.

• Motor operating current.

3.20.5.2 Heat Pumps:

• Manufacturer’s tests confirmed and manufacturer’s commissioning report provided.

• Motor current under full and part load.

• Test all safety devices and control interlocks and associated instruments.

• Set all automatic controls and demonstrate control response and stability by artificially increasing and reducing system load.

• Check all heat pump operating conditions – compressor suction and discharge pressure, oil pressure, refrigerant levels.

• Air flow rate at terminals (balancing results).

• Air supply temperature.

• Room condition, temperature humidity and/or pressure.

• Check for air movement by smoke test.

• Noise level check.

• All automatic damper operations.

• Check marking of balancing dampers.

3.20.5.3 Electric Heaters:

• Manufacturer’s tests confirmed.


• Current.

• Test all safety devices and control interlocks.

• Set all automatic controls and demonstrate control response.

3.20.5.4 Automatic System Controllers:

• Adjust all control set points.

• Check for operational range, differential range.

• Check for actual response and stability by artificially varying control condition during each phase of the Contract Works.

The Mechanical Services Contractor shall adjust the systems and carry out remedial work until all the commissioning results are satisfactory.

After all commissioning procedures have been completed for a particular phase of the project, allow all systems to operate under normal conditions for at least 8 operating hours under the supervision and control of the sub-contractor responsible for the commissioning. Recheck system if necessary until the Engineer is satisfied with the operation and performance of the system.

Tabulate all commissioning check results against design conditions, with ambient conditions during tests.

Calculate and list all equipment operating efficiencies with duties.

Hand a copy of all original result record sheets to Engineer for filing.

Record all commissioning results and detail of equipment and systems in commissioning summary sheets. The format and details of the information shall be as agreed with the Engineer.

Submit a report to the Engineer on the complete commissioning procedure carried out.

Bind all commissioning results into the O&M manuals complete with index and system diagram for easy reference.


Appendix A - Equipment Schedules

A.1 VRF System Heat Pump/Air Conditioning Units

A.2 Fans

A.3 Filters

A.4 Duct Heaters

A.5 Supply Diffusers

A.6 Return/Transfer Grilles

A.7 Extract Grilles

A.8 Door Grilles

A.9 Louvres


A.1 VRF System Heat Pump/Air Conditioning Units

Office Building Indoor FCU Reference

AC-G.1 AC-1.1 AC-1.2 AC-1.3 AC-1.4 AC-1.5

Zone Served Ground Meeting Room

Open Plan Perimeter

Open Plan Perimeter

Open Plan Internal

Open Plan Internal

Meeting Room B

Type Ceiling Concealed (mid Static)

Cassette Cassette Cassette Compact

Cassette Compact

Cassette Compact

Total Cooling Capacity (kW) 9.0 7.1 7.1 4.5 4.5 2.8

Sensible Cooling Capacity (kW) 6.3 5.1 5.1 3.2 3.2 1.7

Heating Capacity (kW) 10 8.0 8.0 5.0 5.0 3.2

Supply Airflow (l/s) 300 233 233 125 125 108

External Static Pressure (Pa) 150

Fresh Air (l/s) 200

Indoor Sound Level (at specified l/s and Pa) @ 1.5m

(dBA)

26-29-34 28-39-30-32 28-39-30-32 28-33-39 28-33-39 26-30-33

Suggested Daikin Indoor Model

PEFY-P80VMA-E

PLFY-P63VBM-E

PLFY-P63VBM-E

PLFY-P40VFM-E.TH

PLFY-P40VFM-E.TH

PLFY-P25VFM-E.TH

Office Building Indoor FCU Reference

AC-1.6 AC-1.7 AC-1.8 AC-1.9

Zone Served Quiet Room

Meeting Room A Waiting Room Staff Room

Type Cassette Compact

Cassette Compact

Cassette Compact

Cassette Full Sized

Total Cooling Capacity (kW) 1.7 4.5 4.5 9.0

Sensible Cooling Capacity (kW) 0.8 3.2 3.2 6.3

Heating Capacity (kW) 1.9 5.0 5.0 10

Supply Airflow (l/s) 108 125 125 267

External Static Pressure (Pa)

Fresh Air (l/s)

Indoor Sound Level (at specified l/s and Pa) @ 1.5m

(dBA)

26-28-30 28-33-39 28-33-39 30-32-35-37

Suggested Daikin Indoor Model

PLFY-P15VFM-E.TH

PLFY-P40VFM-E.TH

PLFY-P40VFM-E.TH

PLFY-P80VBM-E

Outdoor ACU Reference

VRF-01

Type Air Cooled VRF

Area Served Ground & Level 1

Indoor Units Connected AC-G.1 and 1.1 to 1.9

Heat Recovery Yes

Simultaneous Heat/Cool Yes

Total Cooling Capacity (kW) 50

Heating Capacity (kW) 56

EER/COP 3.53/3.73

Sound Pressure (dbA) 62.5

Suggested Mitsubishi Outdoor Model

PURY-P450YSLM-A

Notes:

1. Suggested models are the selections used in the base design. Alternative makes and models will be considered. Capacities listed are at specified condituons and include temperature and pipe length derating. Units supplied shall be equivalent to the models listed above.

2. Duties have been specified with ambient air temperature onto condenser of 28°C summer, 1°C winter.


3. Duties have been specified with internal air conditions 22°C, 60% RH summer, 22°C winter.

4. De-rating for ambient temperatures and refrigerant pipe lengths has been taken into account when selecting the units.

A.2 Fans

A.3 Filters

A.4 Duct Heaters

Fan Reference

SAF-G.1 SAF-1.1 EAF-G.1 TEF-G.1

Location Ground Library Roof Warehouse Bike Store

Service Ground Floor Level 1 Office Lockers Toilets

Fan Type Inline Mixed

Flow

Roof Mounted

Centrifugal

Inline Mixed

Flow

Inline Mixed

Flow

Air flow (l/s) 320 430 120 210

External Static Pressure (Pa) 200 200 75 100

Speed Control Yes Yes Yes Yes

Motor (kW) 0.26 0.43 0.05 0.1

Suggested Fantech

Model

TD-2000/315SIL

CE404S TD-500/150SIL

TD-800/200SIL

Fan Inlet (In Duct)

Max Sound Power Levels

(dB)

63 64 79 51 68

125 71 77 49 61

250 75 72 57 58

500 70 69 59 61

1k 73 62 55 59

2k 64 63 53 57

4k 50 63 45 54

Comments c/w VA speed controller above ceiling for air balancing only

c/w VA speed controller above ceiling for air balancing only



Fan Reference

FIL-G.1 FIL-1.1

Location Bulkhead Ceiling

Service SAF-G.1 Fresh Air

SAF-1.1 Fresh Air

Filter Type G3 Washable Media

G3 Washable Media

Air flow (l/s) 320 430

Nominal Size 900 W x 400 H 500 W x 350 H

Comments

Fan Reference

DH-G.1 DH-1.1

Location Bulkhead Ceiling

Service SAF-G.1 Fresh Air

SAF-1.1 Fresh Air

Air flow (l/s) 320 430

Heating Capacity (kW) 5.5 7.3

Electrical 3 Phase, 3 stage

3 Phase, 3 stage


A.5 Supply Diffusers

Diffuser Reference

S1 S2 S3 S4

Holyoake Reference DDL20 DDL20 CFP-600-20-SE-250

CFP-600-12-SE-150

Length (mm) 500 250 595 450

Width or Height (mm) 200 200 595 450

OBD Yes Yes No No

Comments c/w acoustically lined plenum box

and spigot

c/w acoustically lined plenum box

and spigot


and spigot


and spigot

Notes:

1. Colour of grilles and diffusers shall be advised by Architects

2. Multiple grilles of each type required. Refer to drawings

A.6 Return/Transfer Grilles

Grille Reference

R1 T1

Holyoake Reference EC-125 EC-125

Length (mm) 350 200

Width or Height (mm) 250 200

OBD Yes No

Comments c/w acoustically lined plenum box

and spigot


and spigot

Notes:

1. Colour of return grilles shall be advised by Architects


A.7 Extract Grilles

Grille Reference

E1

Holyoake Reference EC-125

Length (mm) 200

Width or Height (mm) 125

OBD Yes

Comments c/w plenum box and spigot

Notes:

1. Colour of extract grilles shall be advised by Architects



A.8 Door Grilles

Door Grille Reference

DG1

Holyoake Reference DG-52-BFL

Width (mm) 500

Height (mm) 350

Comments

Notes:

1. Grilles supplied shall be equivalent to the models listed above.

2. Colour of door grilles shall be advised by Architects

3. Door grilles to be supplied by the Mechanical Services Contractor, and installed by the Main Builder

4. Multiple grilles of each type may be required. Refer to drawings

A.9 Louvres

Wall Cowl Reference

L-1 L-2

Service Toilet Extract Discharge

Fresh Air Intake

Airflow (l/s) max 210 320

Dimensions (mm x mm)

600x350 800x350

Suggested Holyoake Model

OHL-F-124 OHL-F-124


Appendix B – Schedule of Prices

The prices entered in the Schedule of Prices may be used by the Project Manager for general comparison of tenders. A price shall be entered against each item.

The Tenderer is to ensure that there is no arithmetical error in the Schedule of Prices and that the total thereof is the same as that entered in the Form of Tender. If there is any discrepancy within the Schedule of Prices, the total Tender Amount as entered in the Form of Tender shall be taken as correct.

All prices below shall be in NZ dollars (excluding GST)

Item No.

Description Price

1. The supply and installation of offices and staff room VRF system and associated ductwork, grilles, diffusers, refrigerant piping, and condensate drains

2. The supply and installation of toilet and locker area exhaust fans, and associated ductwork, louvres, door grilles, grilles, and associated accessories.

3. The supply and installation of fresh air supply systems, door grilles, fans, filters, duct heaters, and louvres.

4. Insulation of ductwork and pipework

5. Electrical for mechanical

6. Controls systems

7. Balancing and Commissioning

8. O&M manuals and as-built drawings

9. 1 year maintenance and fine tuning during the defects liability period

TOTAL (to Form of Tender)