BMS Controls - bath.ac.uk Controls Functional Requirements The works in this specification relate to the supply and installation of a new or refurbished TBC ... cable connection;

Project Performance Requirements Draft (1) August 2015

BMS Controls

Functional Requirements The works in this specification relate to the supply and installation of a new or refurbished TBC Building energy Management System (BeMS), together with stripping out of all existing redundant control plant for the University, and the provision of a new dedicated TBC Local Area Network as detailed in this document.

The Contract is to be carried out in strict accordance with the General Conditions, Drawings and Specifications provided.

The Contract shall include for the supply and delivery on site, and all the work for the erection, wiring, installation and testing of all the equipment specified therein for the full and complete installation including the full commissioning, final testing and handing over of the finished installation for immediate use. All materials supplied shall be new and unused.

The Contractor shall co-operate with all other trades to provide details on the management and prevention of health and safety risks created by their work. The Contractor also has duties in relation to the provision of other information to the other trades and employees.

Details of the location of new space temperature sensors and other ancillary sensors, valve actuators presence detection, etc., on this electrical installation will be described within the specification.

All work shown on drawings but not detailed in the specification and vice versa is deemed to be included in the Contractors prices.

The works described are for the supply, provision, delivery, installation and commissioning of all control equipment, together with all wiring diagrams, as installed drawings, panel drawings, software strategies, commissioning and issue of all original installation files including scan files, graphics (using 1280 x 1024 resolution) as necessary to give a full and completed installation for use on both TBC operator supervising systems AND TBC operating systems.

It will be the Contractors responsibility, to ascertain correct details, dimensions, schedules of points and equipment to fully complete this contract.

Metering, external light sensors outside/air sensors, and all other cables not associated with the boilerhouse/plant room local wiring will run to new control panels as indicated in this document. Interconnecting network cabling shall make full use of the new IT ducting systems being installed between buildings. New trench work may be necessary and the contractor is to include for these costs.

The Contractor shall allow for the removal of the existing control panels, as necessary to incorporate the new equipment schedules.

All equipment, panels and parts that are surplus to requirements shall be handed to the University during or at the end of the contract period. All other items shall be disposed of within 48 hrs by the Contractor in a safe and reasonable manner.

It shall be noted that a minimum of four space temperatures per floor are to be installed as part of this contract to take into account all building floor elevations, together with one outside air space


temperature sensor in the correct elevation, and to ensure that the space is adequately monitored/measured.

A minimum of 20% spare capacity shall be left on each controller at handover.

A minimum of 25% spare capacity shall be left on each network at handover.

It is imperative that the spare capacity is maintained at handover and not at design stage.

All doorway graphics will follow University of Bath protocols and shall NOT use dynamic addressing within the doorway pages.

The Contract installation will be connected onto the local TBC, BeMS network and shall communicate back and forth with outstation TBC from the local LAN via a new TBC and network cable connection; in accordance with the details as set out in this specification.

Differential pressure switch pockets where required MUST be included for both supply and installation within this contract.

Each TBC controller will be complete with a 15 character (minimum) identifier depicting and comprising of the following:

4 digit Building code allocated from University of Bath Physical Resources system; 5 or 6 digit floor/room number and 3 or 4 digit control panel number e.g. XX01/3.333/cp01.

All controllers must be fully TBC series local area network compatible types only. Full TBC convention must be adhered to at all times.

All room temperature sensors must be 1500mm AFFL (to centre line), suitably located to avoid unwanted internal and external influences.

FCU’s/AHU’s must incorporate Room temperature sensors and must not rely upon return duct sensors for control. Each FCU/AHU will be fitted with 3 No individual sensors for Air supply, room temperature and extract air.

DIX expansion modules must not be used and larger outstations used in lieu.

Echelon or TCP networking protocols will not be permitted.

Full interactive screen displays shall be designed and installed onto the main supervisor for use by TBC AND a proprietary (TBC) graphical display. These drawings shall be provided to the University on DVD-ROM media or 32GB USB Flash memory stick.

All software shall follow TBC and University software design protocol. Reliance upon the network cabling must be kept to an absolute minimum for alarm handling only, making each outstation self- contained in the event of network or communications failure.

Intercommunications for plant operation will not be permitted without written permission from the University.


Should an intercommunications philosophy be absolutely unavoidable, the Contractor shall submit their detailed requirements in writing to the University and await formal approval before proceeding with the software design.

Each and every controller will be fitted with mains lightning surge protection and the network input output lines of each panel fitted with data lightning surge protection.

Where systems/equipment are indicated as “Generally not connected to BEMS”, then on the

occasion of the project specification confirming their connection requirement, the project

specification shall detail the parameters to be reported, monitored, displayed etc by the BEMS.

System/Equipment Priority Comment

Chiller 1 On/off control, common alarm, flow, temperature set

points

Generator and Fuel Tank 1 Off/run/common fault. Fuel tank level where

appropriate

HVAC Plant and Equipment

Generally all monitoring and control functions, e.g.

on/off, healthy/alarm, dirty/clean, system temp,

valve position and air temp etc

UPS 3 Monitor for common fault - this should be Priority 1

for critical areas in machine rooms

Fire Alarm 1 System healthy/alarm. ID of zone/head in fault where

available

Fireman's switches 2 Mode indication only

Intruder Detection Systems 3 Monitor for common fault

Access Control Equipment 3 Monitor for common fault

CCTV Systems 3 Monitor for common fault

Specialist User Equipment 3 System healthy/common fault

Lighting 3 System healthy/fault

Emergency lighting 1 Fault monitoring

Metering (All gas, water and

electricity utility and sub meters) 1

Provide current reading and half-hourly meter

readings

Individual electrical power

monitoring 3

Current meter reading and half-hourly meter

readings

Cold rooms 1 On-off, healthy/common alarm and temperature

alarm

Fume cupboards 1 Healthy/air flow or fan fail; fan inverter speed where

fitted

Microbiological Safety Cabinets 3 Healthy/air flow or fan fail


Oxygen Depletion Alarms 1 Healthy/alarm

Temperature Monitoring 1 For common space readings and specialist rooms

Humidity Monitoring 1 For specialist rooms only

Sprinkler Systems 3 Monitor tank low level and booster set pump fault

Fire Suppression Systems 1 System healthy/alarm

Laboratory Power Knock Offs 2 Status

Fan Coil Units 3 Central on/off optimum start control temperatures,

fan fail

VRV systems 2 On/off control and common alarm, temperatures,

fault

Individual DX systems 3

On/off control and common alarm. Some rooms are

Priority 1 refer to particular project specification for

requirements

Gas solenoid valves 1 Open/closed/alarm

Additionally during early Stage 1 of the project allowance shall be made for the design

team/contractor to hold a workshop meeting with University of Bath to review the proposed

Description of Operations and the Cause and Effects table.

BMS and Controls

All controls shall be capable of operating in ambient conditions varying between 0oC to 40oC and 0-

95% RH non-condensing. Controls for external application shall be capable of operating in ambient

conditions varying between – 15oC to 50oC and in rain and snow.

All wall mounting sensors and thermostats shall be suitable for mounting on British Standard conduit

boxes.

All control devices shall, unless provided with a flying lead, have a 20mm conduit knockout.

Alternatively they shall be supplied with adaptors for 20mm conduit.

All control equipment shall be installed such that there is adequate clearance for removal of any

such item without dismantling any other item of equipment and also for normal testing,

maintenance and inspection.

When items of equipment are installed in the situations listed below the following ancillary items

shall be included:

External Mounting: All devices mounted externally, or which due to their location are exposed

to the elements, are to be suitably weatherproofed to IP 65.


Pipework Immersion: Corrosion resisting pockets of a length suitable for the complete active

length of the device, screwed ½" or ¾" BSPT suitable for the temperature, pressure and

medium.

Duct Mounting: Mounting flanges, clamping bushes, couplings, lock-nuts, gaskets, brackets,

sealing glands and any special fittings necessitated by the device.

Two position switching devices shall:

Have concealed adjustment unless detailed otherwise in the Equipment Schedules.

Be capable of switching voltages up to 230V ac and all accessible live parts shall be shrouded to

IP 2X as a minimum. Devices with metallic cases or exposed metal parts shall be supplied

complete with an earth terminal.

Temperature, humidity and pressure sensors shall operate on extra low voltage.

Panel Construction

The control panel enclosure shall be manufactured from cold rolled sheet steel, folded and seam

welded at the corners complete with double front door entry. The doors shall be double folded and

welded at the corners mounted onto concealed hinges designed to enable the doors to open to a

minimum of 150 degrees.

Finish: Painted in epoxy powder paint RAL-7032 and protected with textured polyester. The

enclosure shall be supplied with removable gland plates, key locks, and neoprene gasket to give a

degree of protection against adverse conditions to IP54X in accordance with BS.5420.

Minimum overall dimensions shall be 1000mm high, 800mm wide, 210mm deep for an TBC once

prior agreement in writing with University of Bath Maintenance Officer (Controls) series controllers.

All panels will have top and bottom ventilation grilles fitted to avoid over-heating

These dimensions are indicative only for the larger versions. A minimum of 200mm space either side

of each TBC outstation must be allowed together with sufficient space for all associated peripheral

equipment as mentioned herein.

All internal wiring shall be carried out in PVC insulated 600v tri-rated cable to BS 6231. All mains

wiring shall be in phase colours suitable sized for the load under control. All cables shall be ferruled

at both ends in accordance with the wiring diagrams and terminal identification.

The control panel shall be pre-wired to numbered terminals and be complete with permanent

internal component labels with engraved traffolyte labels mounted externally on the panel facia.


The panel shall contain the following:

1 - 3 Phase on load door interlocked isolator

1 - Panel live lamp

1 - Control circuit fuse

1 - Set of traffolyte labels

1 - Fire Alarm operated lamp

1 - Indicator lamp test button

2 - Furse DIN rail mounted ESP 30E Data Network protectors on network cable

1 - Furse inline ESP 240-5A mains protector to each TBC controller

Hagar, Square D, Merlin Gerin (Schneider), Crabtree or Memshield 2 M9 rated MCB’s of appropriate

number, size and rating for each and every item of equipment supplied from this panel shall be

installed.

The Contractor shall allow for mounting and pre wiring the following equipment within each panel:-

TBC outstations as described within this specification

1 - TBC metalclad plus switched connection unit

1 - 240v TBC metalclad plus 30mA R.C.D. type BS 1362 switched socket outlet

1 - TBC Display Panel on main control panels (one per building required)

2 - Panel cooling fans (where VSD’s are fitted inside panels) shall be mounted at high and low level

respectively, sized by the manufacturer to suit the panel heat dissipation requirements, connected

via internal thermostat to prevent overheating.

1 - Digital input pair for connections of no-volt fire alarm interface.

NOTE :

Where reference to lamps is made throughout this document, it shall be noted that ALL indicator lamps MUST be of the L.E.D. type. Tungsten lamps will not be permitted

All panel selector switches are to be of the “AUTO/OFF/HAND” operated type. No selector switches will be usable into hand position without operating the common AUTO/HAND selector key switch.


This key switch shall be a YALE TOK 1 type (RS 1T) only with key removable in both auto and hand positions.

A digital input shall be incorporated to the common AUTO/HAND selector key switch which shall enable the “hand” position of all selector switches. This shall be connected to a digital input critical alarm signal for each panel to indicate that panel has been placed into manual operation. This input will signal an alarm at the supervisor terminal within the Estates Office.

All motors shall be provided with starters or variable speed drives as specified herein that incorporate overload protection. The overload protective device rating of each starter shall be sized so that the middle of its range matches the full load running current of the motor being fed.

Digital expansion (DIX) modules will not be permitted.

MODIFICATIONS OF EXISTING LAN & INC CONNECTIONS

A new TBC copper cored steel braided pvc insulated, pvc sheathed, clear pvc covered cable (LSF)

shall be installed from an adjacent building, to the new panels located within the Contract area. The

same cable types shall be run between panels. All network connections to the existing network must

only be carried out by the specialist controls contractor AND they must ensure that the specialist

University BeMS personnel are in attendance. The Contractor shall ensure that the network cable is

protected against lightning by connecting via 2 No DIN rail mounted Furse protecting devices

COMMISSIONING/FINAL CONNECTIONS

All commissioning and final connections shall be carried out as and when individual outstation wiring is completed and witnessed by University BeMS personnel. Each process of connections, commissioning and energising shall be a continuous process with no one panel being left half commissioned when leaving site. Network connections shall be made with prior written agreement with the University only. All commissioning data shall be submitted in the operational and maintenance manuals as specified.

PANEL DRAWINGS/SOFTWARE STRATEGIES

All drawings should be submitted in AUTOCAD release 2010 and TBC format on paper and disk.

Disk drawings of SET files will also be in .dwg format for AutoCad release 2010.

“Innovision” drawings will NOT be acceptable, and newer versions of AutoCad will also not be acceptable.

Software strategies will also be submitted for written approval by the University before commencement of panel building works can commence.

All software shall follow TBC and University software design protocol. Reliance upon the network cabling must be kept to an absolute minimum for alarm handling only, making each outstation self- contained in the event of network or communications failure. Intercommunications for plant operation will not be permitted without written permission from the University.


Should an intercommunications philosophy be absolutely unavoidable, the Contractor shall submit their detailed requirements in writing to the University and await formal approval before proceeding with the software design.

Sensors and switching devices

The following types of measuring device shall be selected so that the total combined limits of

accuracy of the sensor and its associated BMS controller/IUC are (unless stated elsewhere):

Temperature : ±0.5K

Pressure : ±0.5% of full scale reading

Humidity : ±2% RH

To ensure accuracy, all temperature measuring devices in wells or pockets shall be installed using a

suitable heat transfer medium.

Room thermostats

Scale ranges shall cover a band of at least 5K and no more than 15K on either side of setpoint.

The operating differential shall not exceed 1K, under all load conditions, for rates of

temperature rise and fall within the controlled space of 3K per hour.

Where room adjustment is required, this facility shall include mechanical stops to limit the

amount of adjustment.

Manual override shall only be provided when necessary.

Duct mounted and immersion thermostats

Shall either be of the rigid stem type or else of the capillary terminated in sensing bulb type.

Stem lengths shall be selected upon the duct or pipe size so that the stem extends halfway into

the duct or pipe. If this is not possible then the stem shall have a minimum length of 300mm.

Capillary and bulb assemblies shall have a minimum length of 1.5m.

Scale ranges shall cover a band of at least 5K and no more than 30K on either side of setpoint.

The operating differential shall not exceed 3K for all load conditions.

Thermostats do not need to be provided with an adjustable differential unless specified.

Duct mounted frost protection thermostats

• Rigid stem or capillary type according to the duct cross-sectional area.

Rigid stem type shall be used on ducts having a cross-sectional area of up to and including

0.6m2. They shall be as specified for duct mounted thermostats.


Capillary type shall be used on ducts have a cross-sectional area exceeding 0.6m2. They shall

have a minimum capillary length of 5m and shall operate when any 300mm length of sensing

element falls below setpoint. The capillary element shall be serpentined across the whole duct.

Where the span of the capillary element is less than 1m then it shall be fixed with purpose-

made clips and may be unsupported across the duct.

Where the span of the capillary element is above 1m then it shall be supported on Unistrut or

similar rigid support.

The elements shall be clipped every 200mm and the supports and hangers shall be adequate to

prevent vibration of the element.

Electronic clamp-on type shall be used as an alternative to rigid stem and capillary types

subject to agreement or where specified. The thermistor element shall be clipped to the heat

exchanger return tube within the ductwork by means of a phosphor bronze clip(s). The unit

shall be arranged for automatic reset after power failure.

If the thermostat is located in an area where the ambient temperature outside the ductwork

may fall below the switching point of the thermostat, then the thermostat housing shall either

be located within the ductwork or else insulated against the effects of cold upon its switching

action.

Humidistats

Shall not require regular maintenance, re-calibration or regeneration.

Pressure switches for pipework

Suitable for the medium and the working temperatures and pressures.

Capable of withstanding a hydraulic test pressure of 1.5 times the working pressure.

Connections shall be suitable for 8mm (¼") o.d. copper tube.

Supplied suitable for pipe or wall mounting.

The setpoint shall fall within 30%-80% of the scale range.

Static pressure switches shall have differentials adjustable over 10%-30% of the scale range.

Differential pressure switches shall have a differential of no more than 0.2 bar (20 kPa).

Shall include calibration scales for both setpoint and differential adjustments.

Pressure switches for air systems

Switches shall be supplied with air connections permitting their use as either static or

differential pressure switches.

Shall be supplied complete with brackets suitable for wall mounting or mounting on ducts in

any plane.

The setpoint shall fall within 30%-80% of the scale range.

Shall have a switching differential of not more than 10% of the scale range.


Shall include a calibration scale for the setpoint.

Air flow switches

Shall be selected for the correct air velocity, duct size and mounting attitude.

Exposed parts of the switches shall be suitably coated or made to withstand any special

atmospheric conditions in which they operate.

Water flow switches

Shall be selected for the correct water velocity, pipe size and mounting attitude.

Level switches

Shall be selected for the fluid type, system pressure and have adjustable differentials.

They may be conventional float type, capacitance type or conductivity type.

Where conductivity types are offered they shall include all probes (including earth).

Room temperature switches

Shall have the conduit entry points sealed to prevent draughts blowing through the conduit and

affecting the sensor reading.

Averaging element duct temperature sensors

Shall be used where a probe type Duct Sensor cannot penetrate more than ¼ of the way across

a duct or where specified.

Shall have a minimum capillary length of between 3m and 5m to suit the application

The averaging element shall be serpentined across the whole duct.

Where the span of the element is less than 1m then it shall be fixed with purpose-made clips

and may be unsupported across the duct.

Where the span of the element is above 1m then it shall be supported on Unistrut or similar

rigid support.

Averaging elements composed of multiple thermistor beads are not acceptable.

Room humidity sensors


Shall have the conduit entry points sealed to prevent draughts blowing through the conduit

and affecting the sensor reading.


Duct mounted humidity sensors


Pressure sensors

Shall be suitable for the medium and the working temperatures and pressures.

Shall be capable of withstanding a hydraulic test pressure of 1.5 times the working pressure.

Connections shall be suitable for 8mm (¼") o.d. copper tube.

Ductwork versions shall be supplied with air connections permitting their use as static or

differential pressure sensors.

The setpoint shall fall within 30%-70% of the sensing range of the sensor.

Flow measurement

Differential pressure transmitter/orifice plates

Shall include a differential pressure transducer and orifice plate complete with carrier ring

which shall have pressure tappings and means for local isolation.

Probe type air velocity sensor

• Shall include a sensor complete with a square rooted output and duct mounting probes selected

to suit the application. Sensing lines may be run in PVC or similar tubing.

• Shall have multiple sensing points, shall be of stainless steel construction, shall be of suitable

length to suit the duct size and be individually adjustable for calibration purposes.

• Shall be a differential pressure transducer for velocities of 2.5m/s and above and an electronic

device employing microchip technology where velocities fall below this value.

• Shall provide an output signal of 0 to 10V dc or 4 to 20mA.

• The accuracy of the measured velocity shall be ±5% of the working range and shall be inclusive

of all inaccuracies including the sensor.

Solid state type

Shall include a duct mounting solid state multipoint air flow sensor array complete with signal

processing unit.

The sensor array shall be selected to suit the application and duct size.

The signal processing unit shall provide an output signal of 0 to 10V dc or 4 to 20mA.

The accuracy of the measured velocity shall be ±2% for velocities less than 5 m/s and ±4% for

velocities above 5 m/s.


Natural gas

The sensors shall be arranged for automatic reset after a power failure.

Gas sensors shall have three volt free contacts which shall operate to provide ‘10% LEL alarm’,

‘20% LEL alarm’ and ‘gas sensor fault’.

Volt free contacts shall be suitable for switching 230V ac.

Thyristor controllers

For stepless control of electric heater batteries shall be of the type utilising burst firing, integral

cycle with cut off at zero voltage. Wave chopping types are not acceptable.

Single-phase versions shall be capable of handling up to 20A at 230V, 50Hz.

Shall be supplied complete with quick acting fuses for the specified loadings.

All live parts shall be shrouded.

Shall accept a 1-10V dc or 4-20mA input signal.

Actuators

General

Shall have a sufficient torque to open and close valves and dampers against the maximum out

of balance pressure across them.

Shall be supplied complete with the necessary universal joints, cranks, linkages and mountings

for the specified motorised valve or motorised damper.

Shall have position indicators. The fully open and closed positions shall be unambiguously

marked.

Shall have a manual override facility.

Shall have a linear stroke/control signal characteristic.

Control Damper Actuators shall be of the type where the damper spindle passes through the

actuator and is secured by a U clamp.

Additional features required may include:

Auxiliary Switches: Shall have changeover contacts suitable for 230V ac 2 amp rating. When

provided for modulating motors shall contain at least two electrically independent switches

one for each end of the motor travel, adjustable for operation over at least half the motor

travel. When provided for two-position motors shall contain one electrically independent

switch.

Feedback Potentiometers: One potentiometer whose resistance varies proportionally with the

actuator travel.


Fail Safe: Shall have an auxiliary spring for fail safe conditions. The spring shall be rated for a

minimum of 1000 operations. The spring shall have sufficient torque to open or close valves

and dampers against the maximum out of balance pressure across them.

Valves

General

All valves with the exception of unit valves shall be fitted with valve position indicators clearly

marked to show the fully open and fully closed positions.

All valves shall be tested to a pressure of at least 150% of their standard rated working

pressure.

All valves shall be suitable for the system pressure in which they operate.

Valve bodies Up to and including 50mm shall be screwed and above 50mm they shall be

flanged. The body construction and flanges shall be suitable for the medium, temperature and

pressure of the systems in which they operate.

With the exception of butterfly valves, valves shall be of the single seated plug or rotating ball

types. No plugs or trims shall be constructed of materials liable to corrode or cause sticking.

Valve selection

Characteristics

Two-port and three-port valves when used to control heater and cooler batteries shall have an

equal percentage or modified parabolic characteristic and their rangeability shall be not less

than 100:1.

Two, three and four-port valves controlling fan coils and VAV reheater batteries shall have an

equal percentage or modified parabolic characteristic and their rangeability shall be not less

than 50:1.

Actual valve Kvs values shall not deviate from the quoted Kvs value by more than ±10%.

The Kv of the valve shall not deviate from the stated characteristic curve by more than ±10%.

Three-port and four-port valves shall give an installed constant total flow characteristic, within

±10%, for all valve positions.

Authority

All two-port modulating valves shall be selected to have an authority between 0.45 and 0.7.

All three-port and four-port valves shall be selected to have an authority of not less than 0.45.


Let-by

On liquid applications let-by shall not exceed 0.05% of full duty.

For steam applications, valves shall give 0.02% let-by.

Two-Port Valves shall be selected to ensure that each valve is capable of opening and closing against

the maximum differential head which may be applied across the valve in its circuit.

Three-Port Valves: Only the bottom port shall be used for bypass connections except on terminal

unit valves. Where three-port valves are used to separate flow between two independent circuits,

the selection shall be checked to ensure that the valve is capable of opening and closing against the

maximum differential head which may be applied across the valve.

Four-Port Valves shall have a reduced Kvs on the bypass port such that at 50% authority its

resistance simulates the resistance of the heat exchanger.

Modulating butterfly valves shall be selected so that full flow rate is achieved at the 60% open

position unless a "fishtail" pattern butterfly is used when the valve shall be 90% open for full flow

rate. The actuator stroke shall be set accordingly.

Steam Valves shall be selected to have a minimum pressure drop of 42% of the inlet absolute

pressure

Field devices labels

Engraved Formica laminate labels shall be fitted to all items of controls equipment given a specified

reference number.

Where field mounted local isolators/switch disconnectors and emergency stoplocks are provided

they shall be fitted with engraved Formica laminate labels.

Labels shall be fitted to a flat surface next to the controls device using self-tapping screws or an

epoxy based resin. Where no flat surfaces are available e.g. on valves, the labels shall be hung from

brass chains. Control items in occupied areas other than plant rooms shall be marked with their tag

reference on concealed surfaces i.e. on the inside of a room temperature sensor cover.

Motor control centres and controls enclosures

MCCs shall use MCBs / MCCBs throughout.

MCCs / CEs shall be constructed to Form 2 Type 1 unless instructed otherwise.


‘Type MM’ MCC’s – (Form 2 Type 1)

The MCC shell shall be of ‘cupboard’ type construction.

Shall have unenclosed starters housed within the cupboard.

MCBs up to 100A shall be mounted on a completely shrouded proprietary distribution board

adjacent to the main incoming switch disconnector. Above this they shall be mounted to suit

the equipment served.

A door interlocked MCCB shall be provided to isolate the whole MCC.

Wall Mounted MCCs - 'Type W' (Form 2 Type 1)

Shall be Type MM

Shall not have more than two doors.

Shall not exceed a height of 1200mm, a depth of 450mm or a width of 1400mm.

Shall not have external fixing lugs.

Controls enclosures

Controls Enclosures (CEs) shall be provided where the electrical design negates the requirement for

motor starter within MCCs (i.e. power supplies direct to inverter drives located adjacent to the plant

motors). CEs shall contain all necessary controllers, relays, power supplies, terminals, wiring etc. to

meet the requirements of the functional specification and MEP drawings.

The physical construction of CEs shall comply with the general requirements of a wall mounted MCC.

Forms of separation

The following Forms of Separation are an interpretation of the National Annex N.C. to BS EN 60439-1

Form 2, Type 1


Key

1. Incoming supply functional unit

2. Outgoing circuit functional unit

3. Busbar (or PVC insulated cable)

4. Busbar wrapped or coated insulation

5. Cables

6. External terminals

General Notes:

• Separation of busbars from functional units by insulated coverings

• External terminals in a common compartment

• External terminals separated from busbars by insulated coverings.

Index of protection

All MCCs shall have a minimum protection of IP 54, unless located externally or otherwise instructed.

Where MCCs are located externally mounted and detailed as being of IP65 construction they shall be

provided to the specified steel IP54 level of protection within an IP65 rated glass reinforced

polyester (GRP) housing. Unless detailed otherwise, these MCCs shall have bottom entry for all

power and controls cables.

GRP housings

IP65 GRP housings shall have an opening door which shall allow an operator to step into the

enclosure to gain access to the internal MCC. The intent of the enclosure shall be to provide a fully

sheltered working environment whilst operation and maintenance procedures are carried out on the

enclosed MCC. As such the minimum depth of the enclosure shall be that of the enclosed MCC with

its doors fully open, plus 1000mm.

The enclosure shall be constructed of a fire retardant self extinguishing resin, with a life expectancy

of 30 years minimum. Fixing shall be through fully reinforced flanges by rawbolts to a suitably sized

concrete plinth. When positioned the GRP enclosure shall be weather sealed to this plinth to

prevent the ingress of water. A single opening door shall be provided for access to the MCC within


the enclosure for normal operating and maintenance purposes. The door shall be fitted with a

lockable handle supplied with an Estates keysuite lock.

GRP enclosures shall be fitted with lifting eye bolts at fully reinforced locations to facilitate

positioning.

All power and controls cables shall enter the bottom of the enclosure on a cable/trunking system

and shall be fully supported on a framework/fixing platform within the enclosure. All cable entries

to the GRP enclosure shall be weather sealed to prevent the ingress of water.

The GRP enclosure shall be ventilated by an extract fan and grille mounted at high level to one side

of the enclosure. An air inlet grille shall be provided at low level below the extract grille. Each grille

shall be fitted with an external shroud which shall be sealed from all sides except for a bottom vent,

so as to prevent the ingress of water. The fan shall be switched on and off by a tamper-proof

thermostat mounted within the GRP enclosure and set to [25]°C.

When the GRP enclosure is greater than 3000mm in length, a fan and associated grilles shall be

installed every 3000mm (or subsequent part 3000mm) in length (e.g. a 4000mm enclosure would

require 2 evenly spaced fans, a 7000mm enclosure would require 3 evenly spaced fans).

The GRP enclosure shall be fitted with internal lighting. This shall consist of a bulkhead lighting along

the length of the enclosure. One light shall be placed for every 2000mm (or subsequent part

2000mm) length of enclosure. All lights shall be served by a single switch mounted immediately

within the entrance to the GRP enclosure.

The GRP enclosure shall be externally labelled with the MCC reference, source of supply, circuit

breaker reference and DANGER/WARNING labels which shall mimic those fitted to the facia of the

enclosed MCC. All labels shall comply with the requirements listed under FINISHES AND LABELLING

in this Specification.

Finger protection

All components shall be IP 2X finger protected such that live parts cannot be accidentally touched.

MCC construction shall be such that adequate ventilation shall be provided for internal heat

dissipation. Where required, louvered sections and/or ventilation fans shall be provided.

The MCC shall be provided with space on the mounting plate(s) for future requirements in an

appropriate position and not less than 10% of the usable area. For single door MCCs this space shall

permit one starter and one relay to be added.

All door mounted switches, pilot lights, etc, shall be shrouded or protected to IP2X either individually

or with a sheet of clear plastic material, suitably mounted, including side sheets.


Each MCC shall have a label on the main switch disconnector section indicating the source of main

supply to the panel, circuit breaker reference and circuit reference as appropriate.

In those cases where any item of equipment or section of MCC is not de-energised when normal

isolation procedures are followed, such items or sections must bear clearly visible warning labels of

yellow 'Formica' engraving laminate with black infill.

Busbars

Busbar assemblies shall be four pole, air insulated with a continuous current rating not less than the

total full load current of the applicable MCC including spare capacity requirements. The busbars

shall meet the prospective short circuit requirements detailed in the MCC Equipment Schedules.

Each phase and neutral of the busbars shall consist of hard drawn, high conductivity copper of

uniform rectangular cross section throughout.

The cross sectional area of neutral busbars shall not be less than that of the associated phase bars.

Access to busbars and busbar connections shall be possible only after the removal of covers secured

by bolts or studs. Such covers shall be identified externally by engraved laminated labels bearing the

inscription "BUSBARS DANGER 400 VOLTS" in 30mm high black lettering on a yellow

background. Busbars shall be accessible for inspection once all outgoing and incoming cables have

been installed.

Busbars shall be arranged so that future extensions can be made by bolted links of the same

material.

Connections from main and dropper busbars to the supply side of starters, etc, shall be by means of

dedicated conductors. Conductors installed on a loop in principle shall not be acceptable.

No diversity shall be used in busbar dropper circuits.

Wiring and terminations

All low voltage wiring shall use Tri-Rated cable to BS 6231 type CK. The minimum conductor cross

sectional area for power, control and extra low voltage wiring shall be follows:

Power wiring - 2.5mm2

Control wiring (230V ac ) - 1.0mm2

Extra low voltage wiring associated with BMS and PLC digital inputs and outputs - 0.5mm2

All other extra low voltage wiring - 0.75mm2.


The colour coding shall be as follows:

Phase connections – brown, black and grey.

Neutral connections - blue.

Earth connections - green/yellow.

AC voltages below 50V – white, if the return connection is earthed a yellow/green sleeve shall

be fitted.

DC circuits - pink with red and black ferrules to denote polarity.

Permanent 230V ac connection to live side of main incoming isolator – orange with brown and

blue ferrules to distinguish between live and neutral connections.

All control circuits shall use the L1 phase and shall be wired in brown cable.

Wiring shall be carried on the front surface of the mounting plate, neatly strapped in plastic cable

trunking of the ventilated type, with clip-on covers. Cable sizes shall be rated taking into account all

grouping, bunching and enclosing factors. Within plastic trunking the cables shall not occupy more

than 50% of the trunking volume. Wiring outside the trunking shall be neatly set for connection to

terminals or equipment.

All wiring to the switch section doors shall be wired in looms with mechanical protection. Any one

loom of control cables shall have a limit of 25 cables.

All control wiring shall be identified with resistor colour coded and numbered ferrules. These

numbers shall be shown on the schematic wiring diagrams.

Control neutral wiring shall generally be of the ring main principle with no more than 20 items on

any one ring. A control neutral ring main shall be connected to the main neutral bar via a neutral

link. The neutral link shall be insulated to the same standard as the fuses so that it may be

disconnected without any risk of an electric shock.

Where starter enclosures are provided the incoming control neutral shall pass through an auxiliary

contact of the starter switch disconnector. These neutrals shall be individually connected to the

main neutral bar.

When an MCB / MCCB protected supply with neutral is provided for remote plant, the neutral

conductor shall be connected to the main neutral bar within the MCC via a neutral link. The neutral

link shall be insulated to the same standard as a fuse so that it may be disconnected without any risk

of an electric shock.

MCC wiring for BMS/electronic controls shall be in screened flexible cable. Extra low voltage

terminals shall be separated from wiring and terminals for higher voltages. Each screened cable

shall:


Have its screen wired to its own terminal on the outgoing terminal strip.

Be earthed at the equipment within the panel and not at the terminal strip.

All control wiring shall be fitted with crimped terminal ends. All power wiring shall be fitted with

crimped terminal ends where the terminal is of the 'pinch screw' type.

Terminals shall be DIN rail mounted, suitably rated, fully numbered and fitted so that extra units

may be added. They shall be suitably sized to cater for long runs of externally mounted cable where

voltage drops necessitate a larger size than standard for the connected load. Double banked

terminals shall only be used in exceptional circumstances. If double banked terminals are to be used

without field wiring trunking in the MCC, the terminal rail nearest the gland plate shall be mounted

on a bridge. Terminals may be captive screw or cage clamp types.

Twenty spare terminals shall be fitted to each MCC. Each terminal rail shall have sufficient length for

10% additional terminals.

All wiring for BMS/control devices shall be via hinged 'link' type terminals.

Entry to the MCC terminals shall be via detachable, undrilled gland plates. Gland plates shall cover

the length of the terminal strip, be constructed from non-ferrous metal and be of sufficient thickness

to support the incoming and outgoing cables.

All MCC-mounted equipment shall be wired out to terminal strips.

Control circuits

Each starter/contactor shall be controlled from a Hand/Off/Auto switch on the MCC facia. Each

starter/contactor shall be provided with indicating lamps.

The Hand position on all selector switches shall allow its associated plant to run out of normal

sequential control provided all safety interlocks are satisfied. This facility is primarily for

commissioning/maintenance purposes.

A phase failure relay and lamp shall be provided for 'incoming phases healthy' indication for each

MCC. The phase failure relay minimum setting shall be 360V to allow for the mains voltage

tolerance of 400V ±10%.

A lamp Test pushbutton circuit shall be provided.

A fuse combination unit or MCB (two-pole, lockable in the ‘off’ position) shall be provided for the

isolation and protection of all circuits fed from the live side of the MCC main switch

disconnector. This includes BMS controller(s), internal lighting, anti-condensation heaters, 13 amp

switched socket outlet and gas detection equipment where specified. These circuits shall be


individually sub-protected. The 13 amp switched socket outlet, provided and located in the

BMS/controls section of the MCC, shall be sub-protected at 16 amp and fed via an RCD.

Control circuits shall be either 230V ac or 24V ac. For 230V ac control circuits suitably rated fuses or

MCBs shall be provided for groups of interlocking relays, lamps, timers etc, and no such fuse or MCB

shall feed more than fifteen items. Where fuses are provided, each control circuit fuse shall be

supplied with a 'Fuse Failure' neon lamp. Where MCBs are provided, each control circuit MCB shall

be supplied with a ‘Control Circuit Healthy’ lamp.

For 24V ac control circuits suitably rated fuses or MCBs shall be provided on the primary and

secondary side of the transformer and for each downstream control circuit associated with a system,

i.e. AHU 1, AHU 2, etc. Suitable discrimination shall be provided between the downstream system

fuses or MCBs and the upstream transformer fuses or MCBs such that an individual system fault will

not result in loss of power to other systems fed from the transformer.

Indicator lamps shall be provided to indicate 24V control circuit healthy for every 24V control circuit.

Control circuits for all starter or contactor coils shall be 230V ac and taken downstream of the starter

power fuse or MCB. All starter or contactor coil control circuits shall use the brown (L1)

phase. When the power fuse or MCB is rated above 10A the control circuit shall be sub-protected at

6A.

Where starters are provided for single-phase drives and are connected to the black (L2) or grey (L3)

phases, then the control circuits shall be separately protected from the brown (L1) phase.

Single-phase drives shall be spread over the three phases to avoid overloading the L1 (brown) phase.

Wiring arrangements shall permit all starters/contactors to be de-energised from remotely mounted

lock-off stop buttons or local switch disconnector auxiliary contacts.

Low voltage control feeds that enter a starter enclosure shall pass through auxiliary contacts of the

starter switch disconnector unless the feeds are derived from within the enclosure.

All incoming low voltage control feeds not derived from the MCC shall pass through auxiliary

contacts of the main switch disconnector/fuse-combination unit. If there are insufficient auxiliary

contacts, a slave relay shall be used.

All incoming 24V control feeds not derived from the MCC shall pass through link type isolating

terminals. Suitable warning labels shall be fitted at the terminals.

Each section of the MCC shall have an internal strip light which, in the case of a multiple section

MCC, shall be controlled by micro switches that energise the light fitting in a section when its

associated door is opened.


Switch disconnector and fuse-combination units

Switch disconnectors and fuse-combination units shall have a utilization category and class of duty

suitable for the application, shall be suitable for 400/230V, 50Hz supplies, shall be capable of

opening and closing on-load, shall carry a short circuit current for 3 seconds and shall isolate all live

conductors, and the neutral conductor. The neutral conductor shall be treated as a Live part as

defined in BS 7671.

Where a switch disconnector or fuse combination unit has a removable handle, it shall only be

possible to reconnect the handle with its spindle when the handle is in the same position as the

switch disconnector or the fuse combination unit, i.e. both on or both off.

Switch-disconnector fuses or fuse-switch disconnectors shall be used for all combination units.

Switch disconnectors and fuse-combination units shall be provided with the means to allow them to

be padlocked in the off position.

Where switch disconnectors and fuse-combination units are mounted in enclosures, the enclosures

shall be suitable for their installed environment.

Where the MCC has associated BMS controllers, the main incoming switch disconnector or fuse-

combination unit shall have a dedicated auxiliary contact for status monitoring purposes on the

BMS.

Where local switch disconnectors are provided for motors they shall be provided with an auxiliary

contact which shall be connected in series with the drive's starter contactor control circuit within the

MCC so that when the switch disconnector is switched off, the starter contactor is de-energised.

A fuse-combination unit, mounted internally next to the MCC main incoming switch disconnector,

shall be provided for isolating and protecting circuits fed from the live side of the main switch

disconnector.

Starters

All starters shall be by the same manufacturer.

They shall all be suitable for use on three-phase four-wire, 400/230V, 50Hz supplies and fitted with

220-250V ac operating coils.

Starters up to and including 7.5kW shall be direct on line. Above 7.5kW and up to and including

37.5kW they shall be open transition automatic star-delta. Above 37.5kW they shall be electronic

soft starters.


Starters shall be selected to ensure that the thermal overloads will not trip during any

motor/machine run-up time.

Unless housed in a type ‘MM’ MCC, all starters shall be housed in IP 51 enclosures and incorporate

an integral on-load mains isolator having sufficient auxiliary contacts to isolate all incoming feeds

and with a facility for being padlocked in the 'OFF' position.

All starters up to and including 37.5kW shall be fitted with interchangeable thermal overloads. They

shall include single phasing protection of the differential heater type, to switch the motor off when a

phase is lost even if the resulting currents in the healthy phases do not exceed the full load current

rating of the motor. For motors above 37.5kW overload protection shall be provided by the

electronic soft starter.

All overload devices shall be arranged for hand resetting. A reset button shall not be provided on

the starter enclosure. All overload relays shall have overload contacts of the single-pole changeover

type. The overload scale shall be clearly identified as representing either amps to trip or full load

current.

Direct On Line (DOL) starters

For voltages up to and including 1000V ac shall be rated for intermittent periodic duty or

intermittent duty class 0.3, to the requirements of utilization category AC-3.

Automatic Star-Delta (ASD) starters

For voltages up to and including 1000V ac shall be rated for intermittent periodic duty or

intermittent duty class 0.3.

The automatic changeover timers shall be adjustable from one second up to at least 20

seconds.

Where overload relays are connected in the phase circuit the overload relay scales must be

clearly marked to show whether they represent line current or whether the scale must be

multiplied by 1.7 to represent line current.

The star and delta contactors shall be electrically interlocked so that it is impossible for both

contactors to close or be closed at the same time.

Shall maintain the correct phase relationship between star and delta connections to minimise

disturbance on changeover. For example, if the supply phase sequence is L1:L2:L3 and the star

point is S then connections shall be as follows:

Winding 1 Winding 2 Winding 3

U1 U2 V1 V2 W1 W2

Star L1 S L2 S L3 S

Delta L1 L3 L2 L1 L3 L2


Soft-start/stop starters

Shall be supplied as a unit with an enclosure suitable for MCC mounting.

Shall be rated for 400V ac, 50Hz supply and a temperature operating range of 0 to 40°C.

Shall comply with the provision of the EU Council Directive 89/336/EEC amended by Directive

92/31/EEC for Electromagnetic Compatibility.

Soft-start shall be via a range of switch selectable ramp times of between 0.5 and 60 seconds

with a ramp voltage which increases linearly with time.

The control circuit shall incorporate a remote emergency stop facility. This function shall

override the normal 'soft stop' of the starter.

Filters shall be provided on the input and output of such devices.

A contactor shall be provided which isolates the soft-start/stop unit when the motor is not

required to run. The contactor shall be arranged to switch 'off-load'.

The maximum starter current shall be 2.0 times full load current.

Frequency inverters

The rating of the frequency inverter shall be sufficient for the continuous maximum rating of the

motor and not its running load. The drive shall not require the motor to be derated.

The frequency inverter shall have an efficiency in excess of 90%.

The frequency inverter shall be capable of switching on to a motor already rotating.

The input to the frequency inverter shall be of an uncontrolled bridge rectifier type, to limit

harmonic distortion.

The speed shall be smoothly adjustable, and controlled by any one of the following:-

Inverter's keypad - manual/hand operation

Potentiometer - manual/hand operation

0-10V dc signal - auto operation

4-20mA signal - auto operation

It shall be possible to select manual/automatic speed control on the frequency inverter's keypad or

via a remote volt-free contact.

Switching on or off an isolator between the motor and the frequency inverter shall not damage the

frequency inverter in any way.

Full rated output shall be provided continuously with an ambient temperature of 0 to 40°C and 0 to

95% relative humidity, non condensing.


The starting arrangement shall include a ramp speed control, to achieve starting currents not

exceeding normal full load current wherever possible.

The frequency inverter shall provide visual information of motor speed, as a minimum.

The frequency inverter shall be provided with volt free contacts for remote monitoring of running

status, fault status and manual/automatic speed control selected.

The frequency inverter shall provide a 4 - 20 mA output signal for speed (frequency) monitoring.

The control circuits shall be immune to interference caused by operating on normal raw mains

supply in an industrial environment.

Where the frequency inverter is to be installed in the field near to the associated motor and not in a

MCC it shall be provided with a factory assembled IP54 enclosure. If installed within a MCC it shall

be provided with an IP2X enclosure. If installed outdoors the frequency inverter shall be provided

with a factory assembled IP54 enclosure contained within a separate weatherproof housing/MCC.

Thyristor controllers

Shall accept a 0 to 10V dc or 4 to 20mA input signal.

A contactor shall be provided which isolates the thyristor controller when it is not required to

run or in a high temperature shut down condition.

Shall comply with the provisions of the EU Council Directive 89/336/EEC amended by Directive

92/31/EEC for Electromagnetic Compatibility.

Contactors

Shall be of the same manufacture as the starters.

Shall be suitable for use on three-phase four-wire 400/230V, 50Hz supplies and fitted with 220-

250V 50Hz coils.

Shall be rated for intermittent periodic or intermittent duty Class 0.3. The utilization category

shall generally be AC-3 but category AC-1 may be used where the load is positively identified as

being non-inductive, but excluding tungsten filament lamps.

Unless housed in an MCC type MM all contactors shall be housed in IP 51 enclosures and shall

incorporate an integral on-load mains switch disconnector having sufficient auxiliary contacts

to isolate all incoming feeds and with a facility for being padlocked in the off position.

Relays

Shall be fitted with 24V or 230V, ac coils to suit application.

All relays shall have a clearance of 3mm between them.


Relays shall have a minimum contact capacity of 3 amps inductive at 230V ac, and both contact

and mechanical life shall be in excess of one million operations at the circuit's maximum design

current. The minimum standard required contact material is fine silver.

All relays shall have a manual operating button and/ or indicator flags or an LED to indicate

when it is energised.

Timers

Shall be electronic type and have adjustable ranges to suit application.

Ammeters

Shall be of the moving iron type, with external zero adjustment.

Shall be housed in a pressed steel or plastic case with escutcheon plate, finished matt

black. Instruments shall have a compatible appearance, size and finish and be mounted on, or

as near as possible to, the equipment with which they are associated.

Instrument terminals shall be shrouded.

When used with starters, overload scales shall be provided.

Shall have a maximum burden of 3VA at full scale deflection.

Direct connected ammeters may be used for loads up to and including 20A. Above this load,

current transformer shall be used. The current transformer ratio, scaling and coil ratings shall

be stated on the wiring diagrams. Current transformers shall conform to BS EN 60044-1 with

accuracy as Class 1.

Groups of current transformers used on three-phase systems shall have their secondary

connections starred and earthed. When measuring line current values using a common meter

with a selector switch, they shall be connected so that the current transformers shall be

shorted out when not being used for indication. This shall be carried out in the selector switch

by 'make before break' contacts.

MCBs and MCCCBs

Shall be rated according to their manufacturer's recommendations and installed to withstand

the prospective fault current.

Time-current characteristic curves shall be provided for each type of MCB / MCCB.

Spare three-phase ways for MCBs / MCCBs shall be provided on the busbars, comprising 10% of

the total fitted, with a minimum of 2.

A fully detailed typed MCB chart shall be provided within a plastic envelope and fitted within

each MCC section containing MCBs.


Additional features

Where the MCC is to be fitted within a GRP enclosure, power for the enclosures' lights and extract

fan shall be taken from a separate fuse-combination unit fed from the live side of the main switch

disconnector. Lighting and fan power shall then be taken from individually sub-fused circuits. A

power 'ON' lamp shall be mounted upon the MCC fascia to indicate that power to the extract fan is

available.

Externally located MCCs shall be provided with anti-condensation heaters. Internally located MCCs shall be provided with anti-condensation heaters where listed in the MCC Equipment Schedules. Where anti-condensation heaters are provided, they shall be fitted within each section of an MCC complete with thermostat to operate at low temperatures. 110V anti-condensation heaters shall initially be fitted and wired to external terminals for connection to the site temporary power supply during construction. On completion of the site work the 110V heaters shall be replaced with 230V and wiring altered so that the heaters are fed from the fuse-combination unit.

System network communication

All IP addressable devices installed shall where possible communicate, via the TBC and not via a

dedicated stand alone BMS communications network. Refer to separate TBC page.

Controllers

Controllers shall be complete with power supplies, a real time clock, input and output modules,

memory, processors and all other items necessary for proper and correct interfacing and operation

of the control functions.

All controllers shall have peer to peer communications. All controllers shall have a ‘stand-alone’

capability such that a failure of the operator's station shall still permit the plant and controls

associated with the controllers, to continue to operate normally with the controllers continuing to

communicate with one another.

In the event of transmission failure in the controller network the controllers shall continue to

operate with all sequence interlocks and control strategies operating normally accepting those

which require global information. Either user adjustable default values or the last sensed value (user

selectable) shall then be assumed for these global parameters. An alarm shall be raised at the

operator’s station for each ‘off-line’ controller.

All necessary interfacing equipment shall be provided so that the controllers are fully compatible

with all items of plant and equipment.

When not installed inside MCCs the controllers shall be enclosed in lightweight wall mounting

cabinets. These cabinets shall be ‘Type W’ (refer to MCCs (MCCs)) constructed to IP 51. The

cabinets shall be provided with a key-lock.


The controllers shall be constructed so that the cabinets and internal terminal strips can be

mounted, and electrical terminations made, with all electronics being added at a later date during

the testing and commissioning phases.

The controller shall be capable of accepting digital, analogue, pulsed inputs and providing digital and

analogue outputs.

Digital Input: Shall monitor the change of state of a volt free contact.

Pulsed Input: Pulses (voltage-free contact closures, i.e. digital type input) originating typically

from flow meters, electrical kWh or kVA meters, etc. and shall be accumulated into registers. A

register shall be resettable to zero either by software or operator command. The input must

be able to accept pulses up to a frequency of 10Hz with a minimum duration of 50ms. All

counts must be stored in a non-volatile register so the count value is not affected by a power

failure.

Digital Output: The output signal, a voltage free contact which shall close upon energisation of

the output. Should digital outputs be used to drive modulating actuators, other than for

terminal unit applications, a potentiometer shall be fitted to the actuator and connected to the

BMS to provide actuator position feedback. The controller shall use this feedback to ensure

the accuracy of positioning of the actuator.

Analogue Inputs: Analogue to digital conversion (ADC) with a minimum resolution of 1024

counts (10 Bit) over the input range (i.e. 0-10V, 2-10V, 0-20mA, 4-20mA etc.) of the

sensor. The sensor range shall match the process control range. Any equipment necessary for

the conversion of an input signal to the required input level shall be provided

Analogue Outputs: Digital to analogue conversion (DAC) shall be performed by the controllers

with a minimum resolution of 256 counts (8 Bit) over the output range which shall also match

the control range of the device and/or system being controlled. Any equipment necessary for

the conversion of the output signal to the required process level (i.e. 0-10V, 2-10V, 0-20mA, 4-

20mA etc.) shall be provided. Analogue outputs driving damper and valve actuators shall not

be used to drive raise/lower actuators through interface devices.

Universal Inputs: Shall be configurable to either digital or analogue input and shall have the

features defined above.

Each controller or controller location shall be provided with spare hardware capacity for future

additions of at least 25% of each type of point. Universal inputs may be counted as either a spare

digital or analogue point, but not both. Note that this spare capacity may be accomplished by the

addition of input/output modules. Memory shall also be sufficient to allow all programs associated

with these points to be run in the controller.

Multiplexing boards to convert analogue inputs to multiple digital inputs and analogue outputs to

multiple digital outputs shall not be used.


The controllers shall be provided with their own internal battery backup power supply, capable of

maintaining all memory including the real time clock for not less than 72 hours. The battery shall be

easily replaceable i.e. not soldered to the PCB.

Each analogue input shall be calibrated (to compensate for non-linear characteristics of input

devices, line resistance and similar items) to achieve an accuracy, of the displayed value on the

operator's station, as detailed in this Specification for each sensing device. Calibration and scaling

data shall be retained in the controller memory. Open or closed circuits on sensor inputs shall be

recognised by the controller and annunciated as alarms on the system operator's station(s). If a

sensor fails (open or closed circuit or out of range) then its associated control loop shall default to a

safe condition.

It shall be possible to characterise each analogue output to an actuator in order to obtain a near-

linear response from the device the actuator is controlling. This may take the form of a look up table

with a minimum of 6 co-ordinates, such that the linear output from a control loop is converted into a

non-linear control signal to the actuator.

Intelligent Unitary Controllers (UICs)

Where a controller is used to monitor and control VAV boxes, FCUs, heat pumps etc, they shall be

classed as intelligent unitary controllers (IUCs).

IUCs shall be either small freely programmable controllers or firmware application specific

controllers which shall be selected to meet the performance requirements of the Particular

Specification.

Each IUC shall have its application program, setpoints, limits and schedules etc. stored on non-

volatile RAM or battery backed for a minimum of 2 years.

Real time clock functions are not essential where these commands are generated by other

controllers, which shall also control the transfer of information to, from and between IUCs on

the same communications network.

Each IUC shall be interrogated and adjusted by an operator's station or portable terminal which

may plug into the network at any point.

Only inputs and output points necessary to meet the functional requirements of the Particular

Specification are required to be supplied. The spare capacity as detailed under 'controllers' is

not required.

Uninterruptible power supply

Shall be of the type that in the event of mains failure the equipment supported shall not power

down and reboot.

Shall be capable of maintaining, in a fully functional mode, its associated devices for a period of

20 minutes.


Shall have sealed batteries and include volt free contacts for connection to the BMS for

monitoring of ‘battery low level’ and ‘charger fault’.

Controller software

All software relating to plant control and monitoring detailed in the System Narratives shall

reside at controller or unitary controller level. Only management software shall reside at the

operator station.

All programs shall be scanned as a minimum every two seconds.

Software shall include diagnostic routines which check hardware for correct operation. All

hardware faults shall be annunciated on the operator's station(s).

Password access

Operators shall gain access to the system by logging on which shall be achieved by entry of a

unique operator name and password combination.

Each operator shall be assigned a system access level which shall enable that operator, once

logged on, to access only those command, monitoring and program functions which have an

equal or lower access level.

Only the highest access level shall enable assignment or reading of operator passwords.

The system shall record logging on/off activity. Terminals shall automatically log off after a pre-

set time if no keyboard activity has occurred. In addition, operators shall be able to manually

log off when leaving the terminal.

The configuration of system access levels shall be submitted for approval before commissioning

commences.

Alarm processing

All BMS alarms generated at their associated controllers shall be made available, via an OPC server,

for presentation on the common graphical user interface (GUI) software platform.

Refer to the TBC for further information.

Alarm limits shall have associated hysteresis bands to avoid nuisance alarming. A time delay shall be

associated with the alarm such that the alarm does not occur until the required alarm state has

existed for longer than the delay period.

Mismatch: The alarm is associated with an output command point and an input giving status

feedback of the output command. The alarm is generated when the status feedback does not

correspond with the output command status for longer than a defined time delay period.


Configuration

Configuration data shall be stored in the controllers or the unitary controllers. Configuration data

shall include but not be limited to the following:

The engineering unit applicable (°C, kPa, m3/s etc).

The point identifier (minimum of 12 characters).

The point alarm message if applicable (minimum of 80 characters).

The point descriptor (minimum of 32 characters).

Other miscellaneous information necessary for the correct operation of the entire BMS (e.g.

TBC run hours, accumulation, access levels etc).

All configuration data shall be displayed in alphanumeric characters. Configuration shall include but

not be limited to the following points:

All system peripherals and remote controllers.

System inputs and outputs (binary and analogue).

System alarms.

System calculation results (e.g. efficiency values).

System parameters and timers.

System programs (e.g. event initiated program).

System points received via a data interface.

Once configured, points shall then be assigned to colour graphic displays and/or logical groups.

Colour graphic displays

All field Input/output points controlled and monitored on the BMS shall be made available, via an

OPC server, for presentation on the common graphical user interface (GUI) software platform.

All virtual BMS software points shall be made available, via an OPC server, for presentation on the

common graphical user interface (GUI) software platform.

Programming

The system shall have the facility for the user to write his own programs. Programming shall be

performed via an operator's station or portable computer.

Programming shall be user friendly and not require the services of a specialist software

programmer.

The BMS shall be programmed to achieve all functions described in the System Narratives.

Adjustable software parameters for each process loop, including the setting of the proportional

bands, integral times and derivative rates, shall be set up and tuned on site and the values


recorded in the appropriate engineering units. All settings shall be such that each process loop

performs within the required tolerances and that there is no hunting (cycling) of final control

elements.

Power failure restoration or normal mode following a fire

Unless otherwise detailed in the System Narratives full recovery from either of these conditions shall

be fully automatic and a return to normal indication reported on the operator's station. All plant

shall be sequentially started on a controller-by-controller basis, with time delays between the

starting of each item of plant over 5kW.

The main incoming switch disconnector fuse-switch combination unit shall be monitored for its open

status via an auxiliary contact. The purpose of this is to cancel mismatch alarms when the main

switch disconnector or fuse-switch combination unit is switched off. If there are two or more

controllers in a MCC, the auxiliary contact shall be wired to each controller or alternatively the

auxiliary contact shall be wired to one controller and the status conveyed to other controllers via the

communication network.

Transient / spike protection

All microprocessor based controllers and other electronic equipment such as unitary controllers,

personal computers and peripheral equipment and communications equipment, must be capable of

withstanding transient disturbances from the input power supply.

Suppressors shall be fitted to all controller input and output points for protection against voltage

transients, spikes etc.

The controllers’ communication network(s) shall be isolated against transient disturbances via

optical couplers or other approved means. Where running between buildings, lightning protection

devices shall be installed on the communications network at the point of entry to each building.

Electromagnetic compatibility

All components of and the complete BMS system shall comply with the requirements of BS EN 50

081-1 Generic Emission Standard and BS EN 50 082-1 & 2 Generic Immunity Standard.

In order to avoid corruption of the BMS equipment operation by electrical interference, all wiring

shall be installed to minimise coupling of electromagnetic and electrostatic interference on low

voltage signals and data wiring. The preferred method of achieving this shall be by ensuring a

physical separation of greater than 50mm between the power supply cables and the signal and data

cables. Where mixed wiring is unavoidable braided screen mains cable, dressed close to metalwork,

is preferred.


The BMS shall be protected from interference by the operation of hand held radio transmitters,

radio pagers, etc, within 1 metre of the equipment.

BMS functions / standard programs

Point override

It shall be possible to override all input and output points by use of the BMS manufacturer's

standard software engineering pages or graphics.

Manual start/stop

Manual start/stop shall be provided for each system and individual item of plant e.g. pump,

fan, etc.

When the manual command can be overridden by other signals e.g. fire, frost, etc. the system

or item of plant selected for manual start/stop control shall be manually controlled without

'forcing' the output point(s) directly.

Fixed time program

The time program shall enable and disable item(s) of plant at specific times for each day of the

week. It shall be possible to specify a minimum of four switching times per day.

It shall be possible to program for up to twelve months in advance including holidays and to

make temporary time adjustments which automatically reset once operated.

At the request of the operator, a system summary of all or selected time schedules may be

displayed on the operator's station and/or printed out.

Optimum start/stop

Optimum start and stop programs shall be provided for energy conservation where specified

and shall calculate the optimal start and stop times for the HVAC plant, based on occupancy

time, measured internal space and outside conditions. The programs shall be suitable for both

heating and cooling operation as specified and shall be self-adaptive, i.e. they shall make

corrections to the optimisation characteristics in accordance with the accuracy of their

predictions. The program shall take account of the day of the week, occupancy patterns and

holidays.

Unless otherwise detailed in the narratives any optimum start 'boost' condition shall be

terminated by either occupancy time being reached or by occupancy temperature being

achieved whichever occurs first.

For both optimum start and stop operation, after the initial learning period, setpoint should be

achieved within ±15 minutes of the start or end of occupancy.

The program shall incorporate facilities for maintaining the internal space temperature of the

building or system above a predetermined minimum level, outside occupancy hours.


For each optimum start program the following points shall be logged:

Plant start time.

Outside air temperature at plant start time.

Inside air temperature at plant start time.

Time optimum start terminated.

Lowest inside air temperature at optimum start termination time.

Time inside setpoint achieved.

For each optimum stop program the following points shall be logged:

Plant stop time.

Outside air temperature at plant stop time.

Inside air temperature at plant stop time.

Time inside setpoint achieved.

Rotational point

This program shall initiate the altering of the control point designation (such as duty/standby

and lead/lag) under any one of the following circumstances:

On a calendar basis (e.g. weekly, monthly).

Once a predefined hours run total has been reached.

Once a predefined time is reached.

Major plant items (boiler, chillers etc.) affected by the automatic changeover of other items of

plant (pumps, fans etc.) which are running when the rotational point is required to operate

shall be shut down in a controlled manner before point rotation occurs. Following point

rotation, the main plant shall be restarted as required.

The parameter which defines which item of plant is which (i.e. lead or lag; duty or standby)

shall be configured to allow its display. Upon failure of the lead or duty machine the lag or

standby machine will run in its place and become the duty/lead machine.

Once the rotational point has operated to place the failed lead/duty machine in the

lag/standby position or the lag machine has failed the rotational point shall be inhibited until

the failed machine is reset from the operator's station.

Run time totalization

A run time totalization program shall be provided for each drive or plant enable output. The

system shall initiate an identifiable alarm output whenever the preset limit has been exceeded

for the particular item.

The run time total shall be accessible by command from the operator, who shall also be able to

reset the limits or zero the count for each item.


Enthalpy control

An enthalpy switchover program shall operate for the plant detailed in the System

Narratives. The program shall monitor the outside air enthalpy and the return air enthalpy for

the nominated plant.

When the specific enthalpy of the outside air exceeds that of the return air during a cooling

cycle, a command signal shall be provided to position and hold the HVAC plant dampers in the

minimum fresh air position. The dampers shall remain in this position for a minimum specified

time.

When the specific enthalpy of the outside air is less than that of the return air the normal

damper control sequence shall be resumed provided the minimum time period has elapsed.

Whenever enthalpy changeover occurs the enthalpy condition shall be logged.

General control requirements

Damper Operation in a Selector Switch Hand Position: If a damper position is required to be proven

prior to a fan being commanded on whilst selected in auto then the same shall apply for the fan in

Hand. This shall be achieved through a suitable hardwired circuit.

Requirements For Fixed Speed Single Drives With Flow Proving: When commanded to run from the

BMS, all fan/pump(s) specified as having flow proving shall be proven running, when a flow

condition is sensed by the appropriate flow sensing device, wired in series with the associated

normally open starter contactor auxiliary contact. A time delay shall be provided in the BMS to allow

each drive to start. If a drive fails to start after a time delay, or stops once running, then the

appropriate 'failed' alarm shall be raised.

Plant Frost Protection: Frost protection of a plant shall operate whether the plant is selected to run

in 'Hand' or 'auto'. If necessary, a separate BMS binary output shall be provided to prevent plant

operation in a frost condition for this purpose.

MCC Main Incoming Switch Disconnector / Fuse-combination Unit Status Monitoring: Where listed

in the Equipment Schedules the main incoming switch disconnector or fuse-combination unit

associated with an MCC shall have an auxiliary contact which shall be connected to the BMS

controller within the MCC for the purposes of status indication and the cancelling of mismatch

alarms when the switch disconnector or fuse-combination unit is switched off.

Power Supply Connections for BMS Controllers: The BMS controller(s) shall be connected to the live

side of the main incoming switch disconnector or fuse-combination unit as detailed under ‘MCCs’

except in the instance where an MCC has dual power feeds with automatic changeover, when the

controller(s) shall be fed from the common downstream supply.


Wiring installation

In plantrooms cables shall be wired in LSF cables when contained in trunking, conduit, racking

or tray.

Outside of plantrooms all cables shall be wired in LSF and run in trunking or conduit

Except in the case where it is terminated in full view every cable end shall be provided with one of

the means of identification listed below. In particular, this requirement shall apply to all cables

terminating on the back, or in the base, of a cubicle type or similar switchboard or control panel and

in any other case where the function of the cable is not immediately obvious.

An engraved plastic or brass label securely screwed to the cable sealing box.

A stamped or engraved plastic, brass or aluminium label securely tied to the cable close to the

sealing box with galvanized iron or tinned copper binding wire or plastic cable ties.

PVC sleeve markers threaded onto a PVC carrier strip fastened to the cable with cable ties.

Stainless steel sleeve markers threaded onto a stainless steel carrier strip fastened to the cable

with stainless steel cable ties.

Printed labels in transparent plastic holders fastened to the cable with cable ties.

The means of identification shall give the cable size, number of cores and function together with the

cable reference number if one has been allocated.

Cables shall additionally be identified within each riser cupboard and at intervals not exceeding

30 metres.

Cables shall be installed on the 'loop in' basis and joints between terminal points will not be

permitted. A maximum of three conductors only shall be connected to any one terminal.

Connections to cables shall only be made in fittings, accessories or equipment enclosures.

PVC cables to BS 6004, LSF cables to BS 7211 and rubber cables to BS 6007 shall not under any

circumstances be run underground.

Cables shall not be installed where the ambient temperature is likely to result in the conductor

temperature exceeding the limiting temperature of the insulation.

Conduit

Conduits shall be installed in a neat and tidy manner. Conduits in or on walls shall run either

horizontally or vertically. Conduits on ceiling or roof structures or in slabs shall run either parallel

with or perpendicular to the structural elements of the building. Conduit boxes and accessories shall

be correctly aligned. Conduits shall enter boxes at 90° to the face.


No conduit smaller than 20mm diameter shall be installed unless shown on the drawings.

Conduit runs in damp situations shall be arranged to be self-draining to specific drain points which

shall consist of BS boxes but not boxes containing live terminations.

All bends and sets shall be formed from straight conduit except where the installation makes this

impractical, when 90° normal factory made bends may be used. Inspection elbows, bends and tees

shall not be used.

Where a number of conduits converge, large adaptable boxes shall be employed to avoid the

conduits crossing. Boxes used with steel conduit shall be grey cast iron or sheet steel as specified.

Boxes used on non-metallic conduit systems shall be of the same material and be the same colour as

the conduits. Conduits shall be connected to the boxes by means of male bushes and couplers.

Conduit terminations at apparatus subject to vibration or movement shall be made in heavy gauge

sheathed flexible metallic conduit. Adaptors shall have male threads for connection to the rigid

conduit system via an adaptable box.

Where conduits cross movement joints expansion couplings shall be installed.

Draw-in boxes shall be provided to give access to all conduits for the drawing in or out of any cable.

Draw-in boxes shall be of ample size to enable the cables to be neatly diverted from one conduit to

another without undue cramping. No cable joints shall be allowed in draw-in boxes under any

circumstances. Generally where conduit is to be installed, from point to point in a straight line,

draw-in boxes shall be installed every 9m of conduit run.

All conduit boxes not carrying lighting or other fittings shall be installed with a suitable cover fixed

with brass or stainless steel round head screws.

Covers for external application shall have machined faces, and shall be provided with neoprene type

gaskets.

No box shall be fixed in such a position as to be inaccessible on the completion of the building

structure or other services.

All conduit shall be free of rust patches or other defects on delivery and shall be protected from

mechanical damage and weather when stored on site.

Steel conduit

Only galvanized accessories shall be used with galvanized conduit.


Particular attention shall be paid to the continuity of all conduits and fittings to avoid high resistance

of any joints and connections. Earth continuity links of 2.5mm2 green/yellow insulated copper wire

shall be fitted at expansion couplings.

Conduits shall be installed at the maximum practical distance from cold water, hot water and gas

pipes or other metal enclosed services. Where conduits have to run in close proximity to these

services, the metalwork of the services shall be electrically bonded together and to the conduits with

a bonding conductor.

In damp and exterior situations or when fixing into concrete sherardized or cadmium plated screws

or stainless steel screws in bronze inserts shall be used.

Flexible steel conduit

Adaptors shall be of the solid type in brass or zinc plated mild steel. The flexible conduit shall be

PVC-sheathed.

Continuity tests shall be made at the completion of the conduit installation and details of the test

results shall be entered on the Inspection Certificate.

Trunking:

Where trunking passes through walls, floors and ceilings, proprietary fire barriers shall be installed in

the trunking. The fire barrier shall have a rating not less than that of the original construction.

Trunking runs in damp situations shall be arranged to be self draining to specific drain points where

a hole shall be drilled in the lower surface of the trunking. Trunking runs shall not drain to

enclosures or other electrical apparatus containing live terminations.

Steel trunking

Trunking installed externally shall be manufactured from galvanized sheet steel in accordance with

BS 4678 protection Class 3.

Lengths of trunking shall be bonded to each other using copper links, suitably tinned or plated to

prevent corrosion and not less than 12mm wide x 1.5mm thick, fixed with brass nuts, bolts and

serrated washers. Links shall be supplied by the trunking manufacturer.

Turnbuckle type lid fixings shall be specifically designed to avoid trapping wires.


Testing, Commissioning and Demonstration

MCC and wiring installation testing

Prior to despatch, check at works all wiring within control MCCs, for loose connections, correct

terminations and compliance with wiring diagrams. In addition, functional checks shall be

carried out in the Works to ensure that all interlocking and sequencing is in accordance with

the performance requirements of the Specification.

Carry out pressure and insulation resistance tests on MCCs as follows:

With all live control circuits and neutrals disconnected but with all switch disconnectors closed

and power fuses fitted, the MCCs shall be subjected to a pressure test of 2.5kV for five seconds,

across the following points:

1. Phase to phase

2. Phase to neutral

3. Phase to earth

This shall be followed by an insulation resistance test with an approved type of 1000V testing

instrument.

With all electronic components and time switches removed and with all switch disconnectors

closed and power fuses fitted, an insulation resistance of not less than 20 Megohms shall be

obtained between each of the following points:

1. Phase to phase

2. Phase to neutral

3. Phase to earth

4. Neutral to earth

Certified schedules detailing all tests and their results shall be submitted to the UoB

Representative within fourteen days of the tests.

The UoB Representative shall be given seven days written notice of such tests so that he may

attend if he so desires.

Any work not in compliance found during inspection shall be replaced to a standard

satisfactory to the UoB Representative at no cost to the Contract for the subsequent

inspection.

Wiring installation

Test all BMS/controls and power wiring.


Provide documentary evidence of all cable test results associated with BMS/controls and

power wiring installation.

Report the extent of any failures identified during testing which may affect the installation

programme.

Correct any wiring faults discovered during the testing and commissioning at no additional cost

to the contract.

Commissioning

Fully commission the installed BMS/Controls system once the software has been installed on

site.

Arrange for all flow measurement devices to be commissioned/calibrated by the equipment

manufacturer and provide documentary evidence of such testing.

Set up frequency inverters provided by the BMS/Controls Specialist and the initial start self

tune procedure carried out in accordance with the manufacturer's instructions. This shall

include setting up of underload/time parameters to detect malfunctions.

Pre-commissioning and setting to work

Point to point testing

System functional operation

Setting and adjustment of system variables or control loop values

The installation shall be thoroughly tested in the course of commissioning by the BMS/Controls

Specialist to ensure every point, control device and item of plant is being controlled and/or

monitored correctly.

The installation shall be tested progressively and then finally on completion to ensure that the

installation complies and operates correctly under normal, emergency power, fire, fireman's

override and fault conditions. Control, protection and operative devices shall be checked for correct

adjustment and rating. Throughout the commissioning period detailed records of all testing

undertaken shall be kept and maintained on site and periodically submitted to the Appointed Person

for their information. The detailed records shall include calibration certificates of any

instrumentation used during the commissioning process.

All equipment or materials found to be faulty during testing shall either be replaced or repaired free

of charge.

Where work is being carried out in an occupied building, the building manager shall be kept fully

informed regarding the nature of the testing and commissioning.

Pre-commissioning and setting to work shall include:

Ensuring that field devices have been correctly located for the application.


Ensuring that control devices are correctly installed in accordance with the manufacturer's

instructions and are so mounted that there is adequate clearance for their removal and for

normal testing, maintenance and inspection.

Verification that the control device has the correct range for the application and that the range

is correctly entered in the controller and is correctly engineered on the operator's station.

Attendance during the initial start up of prime movers and the checking of direction of rotation,

hard wired safety interlocks and the suitability and settings of protective devices.

The functionality and operation of all hard wired safety interlocks.

Point to point testing shall include:

Correct operation of a controls device/interface, including any associated status and alarm text.

Correct installation of each valve/damper actuator, and that each valve/damper actuator is

stroked correctly when checked against the BMS output.

Calibration check of the control device.

Labels provided on the control devices and mechanical equipment is correct.

Point to point checks shall be proven from the field device/interface operation to the controller and

from the controller to the presentation of the point on the graphics in a single continuous

operation. The results from the point to point tests shall be submitted on pre-defined schedules.

System functional operation shall include:

Functional testing of the software in accordance with the system narrative on a clause by

clause basis to check system normal, emergency power, fire, fireman's override and fault

conditions as applicable.

The functional testing of hard wired interlocks by simulation of their respective fault conditions

and the subsequent operation of the system in accordance with the system narrative.

Functional testing of the synchronisation between hard wired interlocks and system software

to suppress alarm conditions.

Setting and adjustment of system variables and control loop values shall include:

Setting the correct operational value for delay on/off timers to provide the correct cascade

control or dissipation functions.

Setting the correct operational value for delay timers associated with alarm inhibit functions.

Checking the correct temperature value for out of limit alarms that provide either a high, low

or differential alarm function.

Setting the correct proportional, integral, or derivative values in control loops to maintain

stable control at the required design conditions.

Graphics and Alarm Verification at common GUI


The graphics shall be verified as part of the commissioning process to ensure that they give a

true representation of the installed plant layout, e.g. if heater and cooler batteries are

swapped or a damper has been omitted. Sensors should be located in the correct positions

with relation to other plant e.g. is the sensor before or after the pump?

Demonstration

The BMS/Controls Specialist shall co-operate fully with the UoB Representative / Commissioning

Manager in respect of information necessary for the proper execution of his duties.

The BMS/Controls Specialist shall prior to loading software into BMS controllers on site,

demonstrate all software and head end graphics at works, by simulation of plant operating

conditions using switches, potentiometers, volt meters and lamps etc. The BMS/Controls Specialist

shall give the UoB Representative / Commissioning Manager seven working days notice of software

test dates. The Commissioning Manager may decline to test software off-site.

The BMS/Controls Specialist shall produce a written report for all tests listing all noted defects,

detailing which defects were rectified during the test and which items remained outstanding.

Should a significant number of defects remain outstanding at the termination of a test then the

entire associated system/controller software shall be re-tested.

On site the graphics shall be utilised as a means to carry out point to point checking in a single

operation from field terminal device through controller to operator's station prior to demonstrating

the system functionality.

The BMS/Controls Specialist shall then demonstrate that the installed and commissioned

BMS/Controls system functions and operates as required.

The following shall be demonstrated as a minimum:

1. Each and every point on the system including calibration checks and the stroking of actuators.

2. All system programs comply with the Specification.

3. All data exchange and verification of correct I/O point identification to the common GUI, with

respect to BMS related plant graphics and alarms received and generated on the GUI platform

(provided by others)

Calibration of all devices will be demonstrated using only a currently certified instrument.

Acceptance of the system does not absolve the BMS/Controls Specialist from his responsibility, to

provide a fully operational system, should any defects appear during the warranty period, not

withstanding that a fault was not apparent at the time of commissioning.


Project documentation

Schematic Diagrams of the BMS network complete with system numbering and controller locations.

It provides a quick understanding of the network architecture. A plan view (and elevation view, if

required) of the site which combine to give a reader a quick understanding of the site's/building's

layout.

Functional Description describes in detail, the program and hard-wired control sequences associated

with the systems. It shall be written in an easy to understand format and include the following:

Set points values, time schedules etc.

Mnemonic tag references as detailed in the Specification schedules.

Input/output point addresses.

Software addresses where appropriate e.g. calculation points, global points, etc.

Detail of required operator action in acknowledging and resetting alarms, etc.

Input/output Listings - A complete list of all BMS inputs and outputs including device type

connected, location, point number and terminal numbers.

Strategy Diagrams/Program Listing shall be provided, dependent on the manufacturer's standard

software production method, for each controller and unitary controller. The program listing shall

include English Language descriptions of how the routines work. Both methods shall include the

values of all setpoints, proportional bands, integral reset times, timers etc.

Configuration Data shall include a printout of all English language point and alarm descriptors and

other information as necessary.

Maintenance Instructions shall include any specific items of maintenance which are necessary to

ensure the safe and reliable operation of the BMS, the plant it controls and the MCCs.

Data Sheets for each item of equipment in the BMS and in the MCCs including all field devices.

A complete set of drawings shall be supplied in separate plastic drawing covers and clipped into the

volume.

Schematic diagrams of all systems, detailing the locations of each item of plant in the system and the

control actuators and sensors, complete with cross-reference point and item numbers.

MCC / Controls Enclosure layouts and label details.

Equipment schedules (including all MCC, controls enclosures and field equipment).

MCC wiring diagrams.

CE wiring diagrams.


Field wiring diagrams.

Approved Manufacturers

Controls manufacturers

Equipment manufacturers / suppliers

TBC

Documents

BMS Controls - bath.ac.uk Controls Functional Requirements The works in this specification relate to the supply and installation of a new or refurbished TBC ... cable connection;