SECTION 15800 HEATING, VENTILATING AND AIR CONDITIONINGplanroom.mdusd.org/archive/BID/BID1760/exhibit_1760VOL2.pdf · A. Coordinated layouts are required to amplify, expand and coordinate

MDUSD 1760 Manufacture, Fabricate and /or Assemble and Deliver Heating, Ventilating & Air Conditioning Equipment

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SECTION 15800 HEATING, VENTILATING AND AIR CONDITIONING

PART 1 - GENERAL

1.01 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

B. The requirements of the General Conditions and Division 1 apply to all work hereunder, also applicable provisions of SECTION 15050, MECHANICAL WORK - GENERAL REQUIREMENTS.

1.02 DESCRIPTION OF WORK

A. Work of this section includes, but is not necessarily limited to Heating, Ventilating and Air Conditioning work indicated on the drawings and described herein; also any incidental work not shown or specified that is necessary to provide the complete system.

1.03 COORDINATED LAYOUT

A. Coordinated layouts are required to amplify, expand and coordinate the information contained in the Contract Documents.

B. Provide minimum 1/4 inch equals one foot scaled coordination drawings showing plan and pertinent section or elevation views of all piping, ductwork and electrical systems. Drawings shall be on vellum or sepia mylar, reproducible and the work represented shall be fully coordinated with the structure, other disciplines, and with all finishes. Drawings shall all be presented on a single size sheet. Contractor may use either size D (24 inch x 36 inch) or E (36 inch x 42 inch). Drawings graphics shall fully comply with A.I.A. Architectural Graphic Standards and ANSI Y14. Drawings may be hand drawn or computer generated using AutoCad or "Quick Pen". All drawings shall have title block, key plan, north arrow and sufficient grid lines to provide cross-reference to the design drawings.

1. Provide a stamp or title block on each drawing with locations for signatures from all contractors involved, including but not limited to the General, HVAC, Plumbing, Fire Protection, and Electrical Contractors. Include statement for signature that the contractor has reviewed the coordination drawings in detail and has coordinated the work of his trade.

2. Show on drawings the intended elevation of all ductwork in accordance with the following example.

B.O.D. = 9'-0"

OFFSET UP 6"

B.O.D. = 9'-6"

3. Highlight, encircle or otherwise indicate deviations from the Contract Documents on the coordinated layouts. Architect will not be responsible for "finding" changes or deviations to the original Contract Documents.


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C. Since scale of contract drawings is small and all offsets and fittings are not shown, contractor shall make allowances in bid for additional coordination time, detailing, fittings, offsets, hangers and the like to achieve a fully coordinated installation. If changes in duct size are required, equivalent area shall be maintained and the aspect ratio shall not be in excess of 2 to 1 unless approved by the engineer. Drawings shall be submitted for review prior to fabrication and installation. Drawings may be submitted in packages representing at least one quarter of the building ductwork.

D. Check routing on all ductwork before fabricating. Report any discrepancies to Architect. No extra cost will be allowed for failure to conform to above.

E. It shall be responsibility of the General Contractor to insure that the Heating, Ventilating and Air Conditioning Contractor coordinates all of his work with all other trades, including mechanical and electrical trades, so that complete job is neat and in conformity with plans and specifications.

F. Where computer aided drafting has been used for the Contract Documents, the Drawing files may be made available. Upon request by the contractor, the files will be made available at a price of $50 per drawing, with a minimum of $200.00 per request.

1.04 REFERENCES

A. AABC - Associated Air Balance Council

B. AFBMA - Anti Friction Bearing Manufacturer's Association

C. AGA - American Gas Association

D. AMCA - Air Moving and Control Association Inc.

1. Standard 210 - Laboratory Methods of Testing Fans

E. ANSI - American National Standards Institute

F. ARI - Air-Conditioning and Refrigeration Institute

G. ASHRAE - American Society of Heating, Refrigerating and Air Conditioning Engineers

H. ASME - American Society of Mechanical Engineers

I. ASTM - American Society of Testing and Materials

J. CCR - California Code of Regulations

K. CSFM - California State Fire Marshal

L. NIST - National Institute of Standards and Technology

M. NEMA - National Electrical Manufacturer's Association

N. NFPA - National Fire Protection Association

O. OSHA - Occupational Safety and Health Act


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P. SMACNA - Duct Manuals

Q. CBC - California Building Code

R. UL - Underwriters' Laboratories, Inc.

S. CMC - California Mechanical Code

T. CPC - California Plumbing Code

U. CEC - California Electrical Code

1.05 SUBMITTALS

A. Product Data: Submit manufacturer's technical product data, including rated capacities of selected model clearly indicated, dimensions, weights, furnished specialties and accessories; and installation and start-up instructions. Product data shall include applicable product listings and standards.

1. Upon approval of submittal, provide manufacturer’s installation and operating instructions to the Project inspector for the following:

a. Fire dampers, smoke dampers, and combination smoke-fire dampers.

b. Type 1 kitchen exhaust field applied grease duct enclosures.

B. Roof Curb Data: For roof mounted equipment where combined weight of equipment unit and roof curb or rail exceeds 400 pounds, submit calculations from manufacturer for roof curbs proving compliance with the seismic requirements of the 2013 CBC, and ASCE 7-05. Manufacturer shall certify that roof curbs are suitable for use indicated on Drawings and in Specifications for the seismic design category indicated in structural Contract Documents. Calculations shall be stamped and signed by a State of California registered structural engineer.

C. Engineering Data: Submit fan curves and sound power level data for each fan unit. Data shall be at the scheduled capacity. Data shall include the name of the rating agency or independent laboratory.

D. Maintenance Data: Submit maintenance data and parts list for each piece of equipment, control, and accessory; including "trouble-shooting guide," in Operation and Maintenance Manual.

E. Record Drawings: At project close-out, submit Record Drawings of installed ductwork, duct accessories, and outlets and inlets in accordance with requirements of Division 1.

F. Special Seismic Certification: Submit certification that roof mounted air conditioning units will withstand seismic forces indicated in Contract Documents. Include the following:

1. OSHPD Special Seismic Certification Pre-Approval (OSP) number and back-up data.

a. Back-up data shall include copy of OSHPD form OSH FDD 735, “Application for Pre-Approval,” signed by OSHPD representative.


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b. If compliance is achieved by alternate method approved by OSHPD, provide document indicating compliance method. Include back-up data. IBC Certification is not an acceptable alternate compliance method.

2. Letter from equipment manufacturer indicating:

a. The equipment manufacturer has reviewed seismic forces indicated in Contract Documents and that seismic forces utilized in testing equipment and obtaining an OSP number meet or exceed Project requirements.

b. The manufacturer shall indicate that submitted equipment with OSP number meets criteria in Contract Documents, including features, options, dimensions, weights, anchorage devices, etc. Include Specification Section article reference number or Drawing sheet number with reference to physical location of equipment. If submitted equipment with OSP number does not meet these requirements, the letter shall contain detailed list noting variances from the product specified in Contract Documents.

3. Dimensioned Outline Drawings of Equipment Unit: Identify center of gravity and locate and describe mounting and anchorage provisions.

4. Detailed description of equipment anchorage devices on which the certification is based and their installation requirements.

G. Product Data for California Green Building Standards Code Compliance: For adhesives and sealants, including primers, documentation of compliance including printed statement of VOC content and chemical components.

1.06 QUALITY ASSURANCE

A. Design Criteria:

1. All equipment and accessories to be the product of a manufacturer regularly engaged in its manufacture. All gas-fired equipment shall be AGA listed.

2. Supply all equipment and accessories in accordance with requirements of all applicable national, state and local codes.

3. All items of a given type shall be the products of the same manufacturer.

4. Scheduled equipment performance is minimum capacity required.

5. Scheduled electrical capacity shall be considered as maximum available.

6. Scheduled gas BTU input shall be considered as the maximum available.


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1.07 PLUMBING

A. All plumbing work required in the course of this contract shall be performed in strict accordance with all codes and regulations. Plumbing work done under this contract shall not adversely affect the operation of the existing plumbing systems. All materials shall be new and shall match existing.

PART 2 - PRODUCTS

2.01 GAS FIRED EQUIPMENT

A. All gas-fired equipment shall be listed for use as a gas appliance.

B. All units shall comply with the Nox requirements of the Air Quality Management District (AQMD) in which they are to be installed.

2.02 PIPE AND FITTINGS

A. Refrigeration Piping: Refrigeration gas and liquid piping shall be Type "L" hard drawn copper tubing with wrought copper fittings. All joints shall be brazed with Sil-fos. Relief valve discharge piping shall be full size of relief discharge. Furnish and install Superior, Sporlan, Alco, Henry, or equal, stop valves, solenoid valves, adjustable thermal expansion valves, sight glass, flexible connection, charging valve, and drier with valve bypass in the liquid lines and Superior DFN shell and cartridge suction line filter sized 2-1/2 times tonnage.

2.03 ROOF MOUNTED EQUIPMENT

A. Provide heavy-duty rubber gasket between unit supply and return duct connections at roof and between unit perimeter and roof curb, or as required for an airtight installation.

B. Provide heavy-duty rubber gasket between exhaust fan mounting flange and roof curb, or as required for an airtight installation.

2.04 AIR CONDITIONING UNIT, ROOF-MOUNTED - SINGLE COMPRESSOR

A. Provide factory assembled single packaged outdoor rooftop mounted, electrically controlled gas heating and electric cooling unit, rated in accordance with ARI Standards 210 or 360, and UL listed and labeled, classified in accordance with UL 1995. Provide refrigerant charge R-410A, all internal wiring, piping, controls, and special features required prior to field startup. Design unit to conform to the following:

1. California NOx emission requirements.

2. ASHRAE 15.

3. ASHRAE 90.1.

4. Insulation, adhesive, and all materials exposed to air stream shall meet NFPA 90A requirements for flame spread and smoke generation.

5. Unit casing shall be capable of withstanding 500-hour salt spray exposure per ASTM B117 (scribed specimen).

B. UL tested and certified.


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C. Unit shall be rated in accordance with ARI sound standards 270 or 370.

D. Unit shall be UL tested and certified in accordance with ANSI Z21.47 Standards as a total package.

E. Roof curb shall be designed to conform to NRCA Standards.

F. Unit shall be manufactured in a facility registered to ISO 9001:2000.

G. Unit shall be Energy Star qualified.

H. Cabinet:

1. Provide galvanized steel unit cabinet, bonderized and coated with a baked enamel finish.

2. All airstream interior surfaces shall be insulated with a minimum 1/2-in. thick, 1 lb density foil-faced cleanable insulation. Insulation shall be encapsulated with panel design or have sealed edges.

3. Cabinet panels shall be hinged with integrated non-corrosive hinges. Provide hinged access panels for the filter, compressors, evaporator fan, and control box and heat section areas. Each panel shall have multiple latches and handles. Each external hinged access panel shall be double-wall construction and permanently attached to the rooftop unit.

4. Return air filters shall be accessible through a dedicated hinged access panel.

5. Fork lift slots shall be provided in unit base rail. Base rail shall be minimum 16 gauge.

6. Unit shall have a factory-installed internally sloped condensate drain pan, providing minimum 3/4 in.-14 NPT connections for both horizontal and alternate vertical drain configuration. See Drawings for drain configuration. Pan shall be removable for cleaning and maintenance. All drain pans shall conform to ASHRAE 62.1 self-draining provisions.

7. Unit shall have standard side and alternate field or factory installed thru-the-bottom power and control wiring connection capability.

8. Unit shall be field convertible to horizontal air discharge.

I. Fans:

1. Centrifugal supply air blower (evaporator fan) shall have rubber-isolated, cartridge type ball bearings. Provide belt-driven double inlet fan wheel, centrifugal type with forward curved blades and adjustable sheaves. Multiple speed direct drive motors may be utilized when supplied as standard equipment for efficiency and electrical requirements as scheduled on the Drawings. Fan wheel shall be steel, with corrosion resistant finish, dynamically balanced.

2. Evaporator-fan motors shall be continuous operation, open drip-proof, and thermally protected. Bearings shall be sealed, permanently lubricated ball-bearing type.


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3. Condenser fans shall be of the direct-driven propeller type, with corrosion-resistant aluminum blades. Fans shall be dynamically balanced and discharge air upwards. Condenser-fan motors shall be totally enclosed and thermally protected.

4. Induced-draft blower shall be of the direct-driven, single inlet, forward-curved, centrifugal type. It shall be made from aluminized steel with a corrosion-resistant finish and shall be dynamically balanced.

J. Compressor:

1. Fully hermetic, scroll type with crank case heaters, internal high-pressure and temperature protection.

2. Factory installed rubber shock mounted and internally spring mounted for vibration isolation.

3. Compressor Anti-Recycle Timer: Compressor shall be prevented from restarting for a minimum of five minutes after shutdown, with manufacturers installed compressor cycle delay.

4. Compressor shall have a five year warranty.

K. Coils:

1. Standard evaporator and condenser coils shall have aluminum plate fins mechanically bonded to seamless internally finned copper tubes with all joints brazed.

2. Condenser coils shall be single slab, single pass design.

3. Coils shall be leak tested at minimum 170 psig and pressure tested at minimum 450 psig.

L. Heating Section:

1. Induced-draft combustion type with direct-spark ignition system and redundant main gas valve with 2-stage capability on all 3-phase units.

2. Heat Exchanger:

a. The standard aluminized heat exchanger shall be of the tubular-section type constructed of a minimum of 20 gage corrosion resistant steel. Standard heat exchanger shall have a ten year warranty.

b. The optional stainless steel heat exchanger shall be of the tubular-section type, constructed of a minimum of 20 gage, type 409 stainless steel, including stainless steel tubes, vestibule plate, and collector box. Stainless steel heat exchanger shall have a fifteen year warranty.

3. Burners shall be of the in-shot type constructed of aluminum-coated steel.

4. All gas piping shall enter the unit at a single location. Gas entry shall be through side or bottom of unit. See Drawings for gas entry location. When bottom gas


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entry is utilized, unit shall be furnished with field installed conversion kit, arranged so that gas shut-off valve is accessible from the roof.

5. All factory-installed orifices are for operation up to 2,000 feet of altitude. For altitudes between 2,000 feet and 7,000 feet, a factory certified kit shall be furnished for field installation.

6. Units shall be suitable for use with natural gas or propane. Provide field-installed propane conversion kit as required, see schedule on Drawings.

7. The integrated gas controller board shall include gas heat operation fault notification using an LED (light-emitting diode).

8. Unit shall be equipped with anti-cycle protection with one short cycle on unit flame rollout switch or 4 continuous short cycles on the high-temperature limit switch. Fault indication shall be made using an LED.

9. The integrated gas controller board shall contain algorithms that modify evaporator-fan operation to prevent future cycling on high-temperature limit switch.

10. The LED shall be visible without removal of control box access panel.

11. Gas burner tray shall be removable for maintenance.

M. Refrigerant Components:

1. Each refrigerant circuit shall include:

a. Balanced port thermostatic expansion valve (TXV) with removable power element.

b. Solid core refrigerant filter driers with pressure ports.

c. Refrigerant pressure gage ports and connections on suction, discharge, and liquid lines.

N. Filter Section:

1. Standard filter section shall accommodate 2 inch deep filters. Filters shall conform to the “Air Filters” Article in this Specification Section.

2. Filter section shall use standard size filters.

O. Controls:

1. Unit shall be complete with self-contained low voltage fuse protected control circuit. See sequence of operation and control diagram on Drawings for additional requirements.

2. Provide electro-mechanical controls with 24V thermostat interface or provide microprocessor controls for stand-alone thermostat operation.

3. Electro-mechanical controls shall include the following, as a minimum:


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a. Service run test capability.

b. Provide compressor minimum run time (3 minutes) and minimum off time (5 minutes).

c. Economizer control.

d. Unit shall have 25° F low ambient cooling operation.

e. Time delay relay.

4. Microprocessor controls shall include the following, as a minimum:

a. User diagnostic interface.

b. Unit control with standard suction pressure transducers and condensing temperature thermistors.

c. Shall provide a 5° F temperature difference between cooling and heating set points to meet ASHRAE 90.1 Energy Standard.

d. Service run test capability.

e. Shall accept input from a CO2 sensor (indoor).

f. Configurable alarm light shall be provided which activates when certain types of alarms occur.

g. Provide compressor minimum run time (3 minutes) and minimum off time (5 minutes).

h. Service diagnostic mode.

i. Economizer control.

j. Unit shall have 0° F low ambient cooling operation.

k. Time delay relay.

P. Safeties:

1. Unit shall incorporate a solid-state compressor lockout that provides optional reset capability at the space thermostat, should any of the following safety devices trip and shut off compressor:

a. Compressor lockout protection provided for either internal or external overload.

b. Low-pressure protection.

c. Freeze protection (evaporator coil).

d. High-pressure protection (high pressure switch or internal).


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e. Compressor reverse rotation protection.

f. Loss of charge protection.

g. Start assist on singe-phase units.

2. Supply-air sensor shall be located in the unit and detect both heating and cooling operation.

3. Induced draft heating section shall be provided with the following minimum protections:

a. High-temperature limit switch.

b. Induced-draft motor speed sensor.

c. Flame rollout switch.

d. Flame proving controls.

e. Redundant gas valve.

4. Phase Protection: Provide unit-mounted “SymCom” Motor Saver three phase voltage monitor, model 201A or equal, adjustable voltage range for each unit, install per manufacturer's recommendations, mount in NEMA 3R enclosure if exposed to the weather.

a. Units shall provide the following features:

1) Low voltage fault trip and reset.

2) Voltage unbalance/phasing fault trip and reset.

3) High voltage fault trip and reset.

4) Transient Protection (Internal).

5) Automatic restart.

b. Provide each unit with 600V socket, “SymCom” model OT08.

Q. Operating Characteristics:

1. Unit shall be capable of starting and running at 125° F ambient outdoor temperature per maximum load criteria of ARI Standards 210 or 360.

2. Unit with factory controls will operate in cooling down to an outdoor ambient temperature of 0° F. Electro-mechanical controls shall operate down to 25° F.

3. Unit shall be provided with fan time delay to prevent cold air delivery in heating mode.

R. Electrical Requirements:


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1. All unit power wiring shall enter unit cabinet at a single location - standard side or alternate bottom. See Drawing Schedule for thru-the-bottom power wiring requirement.

S. Motors:

1. Compressor motors shall be cooled by refrigerant gas passing through motor windings and shall have line break thermal and current overload protection.

2. Evaporator fan motor shall have permanently lubricated, sealed bearings and inherent automatic-reset thermal overload protection or manual reset calibrated circuit breakers.

3. All evaporator fan motors 5 hp and larger shall meet the minimum efficiency requirements as established by the Energy Policy Act of 1992 (EPACT), effective October 24, 1997.

4. Totally enclosed condenser-fan motor shall have permanently lubricated, sealed bearings, and inherent automatic-reset thermal overload protection.

5. Induced-draft motor shall have permanently lubricated sealed bearings and inherent automatic-reset thermal overload protection.

T. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include the following:

Carrier Corporation.

U. Provide the following additional features and equipment:

1. Roof Curb: Formed 14 gauge galvanized steel with wood nailer strip capable of supporting entire unit weight. Provide 3 inch wide bottom flange.

2. Provide heavy-duty 18 gauge expanded metal coil guard grille to protect all surfaces of the condensing coil. Coil guard to by Micrometl, Canfab, or equal.

3. Modulating Power Exhaust Economizer: Micrometl, Canfab, or equal. Integrated type capable of simultaneous economizer and compressor operation.

a. Provide self-contained outdoor rooftop system, mounted directly to the return air compartment of the HVAC packaged equipment. Provide differential dry bulb economizer control system and a factory programmed, fully programmable variable frequency drive package controlled by a differential pressure transmitter, mounted directly to the return air compartment of the HVAC packaged equipment. Design the system to continuously maintain space pressure, and provide capability of introducing up to 100 percent outdoor air.

b. Provide hinged cabinet access doors and include latches to provide a tool-less entry for servicing.

c. Provide door lock on the power exhaust cabinet to meet ETL safety requirements.


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d. Outdoor air intake dampers shall be low leak not to exceed 3 percent at 1 inch wg pressure differential and include stainless steel side seal and neoprene edge seal. Arrange dampers to close upon loss of power.

e. Provide belt driven exhaust blowers, double inlet, forward-curved centrifugal type. Provide gravity backdraft damper at fan outlet.

f. Provide fully programmable factory programmed variable frequency drive (VFD) package for each fan, driven by 4 to 20 mA signal from a differential pressure transmitter. Pressure transmitters shall measure 0 - 0.1 in wg. Install room sensor tubing with sensor tube termination installed within the room.

1) Where direct digital controls are utilized, provide Belimo, or equal, damper actuator, complete with spring return and all controls required to make the system fully operational.

2) Where stand-alone controls are utilized, provide Belimo, or equal, damper actuator, complete with spring return and all controls, including logic module, required to make the system fully operational.

4. Duct-Mounted Modulating Power Exhaust: Micrometl, Canfab, or equal.

a. Provide self-contained outdoor rooftop system, mounted directly to the horizontal return air duct of the HVAC packaged equipment. Provide a factory programmed, fully programmable variable frequency drive package controlled by a differential pressure transmitter. Design the system to continuously maintain space pressure.



d. Provide belt driven exhaust blowers, double inlet, forward curved centrifugal type. Provide gravity backdraft dampers with gasketed blades at fan outlets.

e. Provide fully programmable factory programmed variable frequency drive (VFD) package for each fan, driven by 4 to 20 mA signal from a differential pressure transmitter. Pressure transmitters shall measure 0 - 0.1 in wg.

f. Support power exhaust unit as detailed on the Drawings. Support shall not interfere with unit access or functionality.

g. Provide with wiring harness. Install harness per manufacturer’s instructions.

V. Flue Extensions:

1. Provide at all locations where gas flue outlet will be within 10 feet of an adjacent building or unit air intake and locations where adjacent vertical surfaces within 3


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feet extend more than 2 feet above the top of the unit, provide manufacturer’s listed flue extension.

2. Arrange flue extension to terminate 3 feet above top of adjacent air intake or adjacent vertical surface.

W. Replenish for a period of one year without cost to the Owner all refrigerant and oil required to maintain the proper levels.

X. Owner Training: Manufacturer shall provide two initial on-site 4-hour training sessions for Owners’ maintenance personnel. Manufacturer shall provide one 4-hour follow-up training session to be scheduled by Owner within one year of the date of the final initial training session. Training session agenda shall be as follows:

1. First session: Equipment.

2. Second session: Controls.

3. Follow-up session: Agenda by Owner.

2.05 AIR CONDITIONING UNIT, ROOF-MOUNTED – DUAL COMPRESSOR

A. Provide factory assembled single packaged outdoor rooftop mounted, electrically controlled gas heating and electric cooling unit, rated in accordance with ARI Standards 210 or 360, and UL listed and labeled, classified in accordance with UL 1995. Provide refrigerant charge R-410A, all internal wiring, piping, controls, and special features required prior to field startup. Design unit to conform to the following:

1. California NOx emission requirements.

2. ASHRAE 15.

3. ASHRAE 90.1.

4. Insulation, adhesive, and all materials exposed to air stream shall meet NFPA 90A requirements for flame spread and smoke generation.

5. Unit casing shall be capable of withstanding 500-hour salt spray exposure per ASTM B117 (scribed specimen).

B. UL or ETL tested and certified.

C. Unit shall be rated in accordance with ARI sound standards 270 or 370.

D. Unit shall be UL tested and certified in accordance with ANSI Z21.47 Standards as a total package.

E. Roof curb shall be designed to conform to NRCA Standards.

F. Unit shall be manufactured in a facility registered to ISO 9001:2000.

G. Unit shall be Energy Star qualified.

H. Cabinet:


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1. Provide galvanized steel unit cabinet, bonderized and coated with a baked enamel finish.

2. All airstream interior surfaces shall be insulated with a minimum 1/2-inch thick, 1 lb density foil-faced cleanable insulation. Insulation shall be encapsulated with panel design or have sealed edges.

3. Cabinet panels shall be hinged with integrated non-corrosive hinges. Provide hinged access panels for the filter, compressors, evaporator fan, and control box and heat section areas. Each panel shall have multiple latches and handles. Each major external hinged access panel shall be double-wall construction and permanently attached to the rooftop unit.

4. Return air filters shall be accessible through a dedicated hinged access panel.

5. Fork lift slots shall be provided in unit base rail. Base rail shall be minimum 16 gauge.

6. Unit shall have a factory-installed internally sloped condensate drain pan, providing a minimum 3/4 inch-14 NPT connection, for both horizontal and alternate vertical drain configuration. See Drawings for drain configuration. Pan shall be removable for cleaning and maintenance. All drain pans shall conform to ASHRAE 62.1 self-draining provisions.

7. Unit shall have standard side and alternate field or factory installed thru-the-bottom power and control wiring connection capability.

8. Unit shall be field or factory convertible to horizontal air discharge. Furnish unit with kit for field conversion if required by manufacturer for the scheduled unit size. See Drawings for air discharge configuration.

I. Fans:

1. Centrifugal supply air blower (evaporator fan) shall have rubber-isolated, cartridge type ball bearings. Provide belt-driven double inlet fan wheel, centrifugal type with forward curved blades and adjustable sheaves. Fan wheel shall be steel, with corrosion resistant finish, dynamically balanced.

2. Evaporator-fan motors shall be continuous operation, open drip-proof, and thermally protected. Bearings shall be sealed, permanently lubricated ball-bearing type.

3. Condenser fans shall be of the direct-driven propeller type, with corrosion-resistant aluminum blades. Fans shall be dynamically balanced and discharge air upwards. Condenser-fan motors shall be totally enclosed and thermally protected.

4. Induced-draft blower shall be of the direct-driven, single inlet, forward-curved, centrifugal type. It shall be made from aluminized steel with a corrosion-resistant finish and shall be dynamically balanced.

J. Compressor:

1. Fully hermetic, scroll type with crank case heaters, internal high-pressure and temperature protection.


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2. Factory installed rubber shock mounted and internally spring mounted for vibration isolation.

3. Compressor Anti-Recycle Timer: Compressor shall be prevented from restarting for a minimum of five minutes after shutdown, with manufacturers installed compressor cycle delay.

4. Provide with dual electrically and mechanically independent refrigerant circuits.

5. Compressor shall have a five year warranty.

K. Coils:

1. Standard evaporator and condenser coils shall have aluminum plate fins mechanically bonded to seamless internally finned copper tubes with all joints brazed.

a. When supplied as standard equipment for unit size as scheduled on Drawings, condenser coils may consist of corrosion resistant coated aluminum alloy fins, tubes and manifolds.

2. Units shall have face-split type evaporator coil.

3. Condenser coils shall be single slab, single pass design. Single slab, 2 pass design may be utilized when supplied as standard equipment for unit size as scheduled on Drawings.

4. Coils shall be leak tested at minimum 170 psig and pressure tested at minimum 450 psig.

L. Heating Section:

1. Induced-draft combustion type with energy saving direct-spark ignition system and redundant main gas valve with 2-stage capability on all 3-phase units.

2. Heat Exchanger:

a. The standard aluminized heat exchanger shall be of the tubular-section type constructed of a minimum of 20-gage corrosion resistant steel. Standard heat exchanger shall have a ten year warranty.

b. The optional stainless steel heat exchanger shall be of the tubular-section type, constructed of a minimum of 20 gage, type 409 stainless steel, including stainless steel tubes, vestibule plate, and collector box. Stainless steel heat exchanger shall have a fifteen year warranty.

3. Burners shall be of the in-shot type constructed of aluminum-coated steel.

4. All gas piping shall enter the unit at a single location. Gas entry shall be through side or bottom of unit. See Drawings for gas entry location. When bottom gas entry is utilized, unit shall be furnished with field installed conversion kit, arranged so that gas shut-off valve is accessible from the roof.


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5. All factory-installed orifices are for operation up to 2,000 feet of altitude. For altitudes between 2,000 feet and 7,000 feet, a factory certified kit shall be furnished for field installation.

6. Units shall be suitable for use with natural gas or propane. Provide field-installed propane conversion kit as required, see schedule on Drawings.

7. The integrated gas controller board shall include gas heat operation fault notification using an LED (light-emitting diode).

8. Unit shall be equipped with anti-cycle protection with one short cycle on unit flame rollout switch or 4 continuous short cycles on the high-temperature limit switch. Fault indication shall be made using an LED.

9. The integrated gas controller board shall contain algorithms that modify evaporator-fan operation to prevent future cycling on high-temperature limit switch.

10. The LED shall be visible without removal of control box access panel.

11. Gas burner tray shall be removable for maintenance.

M. Refrigerant Components:

1. Each refrigerant circuit shall include:

a. Balanced port thermostatic expansion valve (TXV) with removable power element.

b. Solid core refrigerant filter driers with pressure ports.

c. Refrigerant pressure gage ports and connections on suction, discharge, and liquid lines.

N. Filter Section:

1. Standard filter section shall accommodate 2 inch deep filters. Filters shall conform to the “Air Filters” Article in this Specification Section.

2. Filter section shall use standard size filters.

O. Controls:

1. Unit shall be complete with self-contained low voltage fuse protected control circuit. See sequence of operation and control diagram on Drawings for additional requirements.

2. Provide electro-mechanical controls with 24V thermostat interface or provide microprocessor controls for stand-alone thermostat operation.

3. Electro-mechanical controls shall include the following, as a minimum:

a. Service run test capability.


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b. Provide compressor minimum run time (3 minutes) and minimum off time (5 minutes).

c. Economizer control.

d. Unit shall have 25° F low ambient cooling operation.

e. Time delay relay.

4. Microprocessor controls shall include the following, as a minimum:

a. User diagnostic interface.

b. Unit control with standard suction pressure transducers and condensing temperature thermistors.

c. Shall provide a 5° F temperature difference between cooling and heating set points to meet ASHRAE 90.1 Energy Standard.

d. Automatic compressor redundancy.

e. Service run test capability.

f. Shall accept input from a CO2 sensor (indoor).

g. Configurable alarm light shall be provided which activates when certain types of alarms occur.

h. Provide compressor minimum run time (3 minutes) and minimum off time (5 minutes).

i. Service diagnostic mode.

j. Economizer control.

k. Unit shall have 0° F low ambient cooling operation.

l. Time delay relay.

P. Safeties:

1. Unit shall incorporate a solid-state compressor lockout that provides optional reset capability at the space thermostat, should any of the following safety devices trip and shut off compressor:

a. Compressor lockout protection provided for either internal or external overload.

b. Low-pressure protection.

c. Freeze protection (evaporator coil).

d. High-pressure protection (high pressure switch or internal).


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e. Compressor reverse rotation protection.

f. Loss of charge protection.

2. Supply-air sensor shall be located in the unit and detect both heating and cooling operation.

3. Induced draft heating section shall be provided with the following minimum protections:

a. High-temperature limit switch.

b. Induced-draft motor speed sensor.

c. Flame rollout switch.

d. Flame proving controls.

e. Redundant gas valve.

4. Phase Protection: Provide unit-mounted “SymCom” Motor Saver three phase voltage monitor, model 201A or equal, adjustable voltage range for each unit, install per manufacturer's recommendations, mount in NEMA 3R enclosure if exposed to the weather.

a. Units shall provide the following features:

1) Low voltage fault trip and reset.

2) Voltage unbalance/phasing fault trip and reset.

3) High voltage fault trip and reset.

4) Transient Protection (Internal).

5) Automatic restart.

b. Provide each unit with 600V socket, “SymCom” model OT08.

Q. Operating Characteristics:

1. Unit shall be capable of starting and running at 125° F outdoor ambient temperature per maximum load criteria of ARI Standards 210 or 360.

a. Unit with factory controls will operate in cooling down to an outdoor ambient temperature of 0° F. Electro-mechanical controls shall operate down to 25° F.

2. Unit shall be provided with fan time delay to prevent cold air delivery in heating mode.

R. Electrical Requirements:


Page 19

1. All unit power wiring shall enter unit cabinet at a single location - standard side or alternate bottom. See Drawing Schedule for thru-the-bottom power wiring requirement.

S. Motors:

1. Compressor motors shall be cooled by refrigerant gas passing through motor windings and shall have line break thermal and current overload protection.

2. Evaporator fan motor shall have permanently lubricated, sealed bearings and inherent automatic-reset thermal overload protection or manual reset calibrated circuit breakers.

3. All evaporator fan motors 5 hp and larger shall meet the minimum efficiency requirements as established by the Energy Policy Act of 1992 (EPACT), effective October 24, 1997.

4. Totally enclosed condenser-fan motor shall have permanently lubricated, sealed bearings, and inherent automatic-reset thermal overload protection.

5. Induced-draft motor shall have permanently lubricated sealed bearings and inherent automatic-reset thermal overload protection.

T. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include the following:

Carrier Corporation.

U. Provide the following additional features and equipment:

1. Roof Curb: Formed 14 gauge galvanized steel with wood nailer strip capable of supporting entire unit weight. Provide 3 inch wide bottom flange.

2. Provide heavy-duty 18 gauge expanded metal coil guard grille to protect all surfaces of the condensing coil. Coil guard to by Micrometl, Canfab, or equal.

3. Modulating Power Exhaust Economizer: Micrometl, Canfab, or equal. Integrated type capable of simultaneous economizer and compressor operation.

a. Provide self-contained outdoor rooftop system, mounted directly to the return air compartment of the HVAC packaged equipment. Provide differential dry bulb economizer control system and a factory programmed, fully programmable variable frequency drive package controlled by a differential pressure transmitter, mounted directly to the return air compartment of the HVAC packaged equipment. Design the system to continuously maintain space pressure, and provide capability of introducing up to 100 percent outdoor air.




Page 20

d. Outdoor air intake dampers shall be low leak not to exceed 3 percent at 1 inch wg pressure differential and include stainless steel side seal and neoprene edge seal. Arrange dampers to close upon loss of power.

e. Provide belt driven exhaust blowers, double inlet, forward-curved centrifugal type. Provide gravity backdraft damper at fan outlet.

f. Provide fully programmable factory programmed variable frequency drive (VFD) package for each fan, driven by 4 to 20 mA signal from a differential pressure transmitter. Pressure transmitters shall measure 0 - 0.1 in wg. Install room sensor tubing with sensor tube termination installed within the room.

1) Where direct digital controls are utilized, provide Belimo, or equal, damper actuator, complete with spring return and all controls required to make the system fully operational.

2) Where stand-alone controls are utilized, provide Belimo, or equal, damper actuator, complete with spring return and all controls, including logic module, required to make the system fully operational.

4. Duct-Mounted Modulating Power Exhaust: Micrometl, Canfab, or equal.

a. Provide self-contained outdoor rooftop system, mounted directly to the horizontal return air duct of the HVAC packaged equipment. Provide a factory programmed, fully programmable variable frequency drive package controlled by a differential pressure transmitter. Design the system to continuously maintain space pressure.



d. Provide belt driven exhaust blowers, double inlet, forward curved centrifugal type. Provide gravity backdraft dampers with gasketed blades at fan outlets.

e. Provide fully programmable factory programmed variable frequency drive (VFD) package for each fan, driven by 4 to 20 mA signal from a differential pressure transmitter. Pressure transmitters shall measure 0 - 0.1 in wg.

f. Support power exhaust unit as detailed on the Drawings. Support shall not interfere with unit access or functionality.

g. Provide with wiring harness. Install harness per manufacturer’s instructions.

V. Flue Extensions:

1. Provide at all locations where gas flue outlet will be within 10 feet of an adjacent building or unit air intake and locations where adjacent vertical surfaces within 3


Page 21

feet extend more than 2 feet above the top of the unit, provide manufacturer’s listed flue extension.

2. Arrange flue extension to terminate 3 feet above top of adjacent air intake or adjacent vertical surface.

W. Replenish for a period of one year without cost to the Owner all refrigerant and oil required to maintain the proper levels.

X. Owner Training: Manufacturer shall provide two initial on-site 4-hour training sessions for Owners’ maintenance personnel. Manufacturer shall provide one 4-hour follow-up training session to be scheduled by Owner within one year of the date of the final initial training session. Training session agenda shall be as follows:

1. First session: Equipment.

2. Second session: Controls.

3. Follow-up session: Agenda by Owner.

2.06 SPLIT SYSTEM HEAT PUMPS

A. General: Furnish and install split system air-to-air heat pump systems, complete with automatic controls. The units shall be a standard product of a firm regularly engaged in the manufacture of heating/cooling equipment. The equipment shall be shipped completely factory assembled and precharged, and wired internally ready for field connections. Provide thermal overload protected motors.

1. Arrange internal controller to provide automatic restart after power failure.

2. Provide factory precharged and sealed line set piping, length to suit the location of equipment. Tubing sizes shall be in accordance with manufacturers written instructions. Where line set piping is used, enclose in iron or steel piping and fittings or in EMT conduit.

3. Provide refrigeration piping in accordance with other sections of this Specification.

B. Unit shall be E.T.L. listed. All wiring shall be in compliance with NEC. Rate units in accordance with ARI Standards 240 and 270.

C. Heating/Cooling System: The total certified heating/cooling capacity shall not be less than scheduled. The compressor power input shall not exceed that of the unit specified.

D. The coils shall have aluminum fins mechanically bonded to durable copper tubes. Coils shall be pressure leak tested.

E. The compressor shall be resiliently mounted, have built-in lubrication, crankcase heater, and current and temperature sensing motor overloads.

F. High-pressure switches shall protect the system and a five-minute compressor timed off cycle controller (anti-recycle timer).

G. Cabinet: Galvanized steel with a baked on outdoor enamel paint finish. Cabinet panels where conditioned air is handled shall be fully insulated.


Page 22

H. Service Access: All components, wiring, and inspection areas shall be completely accessible through removable panels.

I. Supply Air Blowers: Centrifugal blowers shall have direct drive motors. The entire assembly shall be resiliently rubber mounted. Blower wheel shall be statically and dynamically balanced.

J. Condenser Fans: Propeller type condenser fans shall discharge horizontally. Fan motor shall be totally enclosed with sleeve bearings, permanently lubricated, inherently protected. A steel or heavy plastic guard shall protect fan.

K. Air Filters: Provide washable filters for indoor unit. Provide sufficient filters for four complete changes for each unit.

L. Control system shall be microprocessor based with a controller for each unit. Controller shall provide for remote adjustment of louver position, fan speed adjustment, temperature adjustment, and test mode. Provide locking cover over each controller. Provide one weekly timer controller for project by unit manufacturer.

1. Install controller for each unit in a lockable thermostat enclosure, sized to suit the controller requirements.

2.07 CLASSROOM HEAT PUMP ENCLOSURE

A. The enclosure shall be Team Air Model TFIE fabricated of precision formed 18 GA, furniture grade, paint lock G-90 galvanized steel. Enclosure’s frame shall be constructed of heavy gauge extruded aluminum modular construction fastened together from the interior with sheet metal screws. Galvanized steel panels fastened to aluminum frame construction from the interior with sheet metal screws to allow for future replacement if required. Exterior exposed fasteners such as sheet metal screws will not be acceptable.

Enclosures shall be specifically fabricated for either right or left hand configurations. Right hand units shall have heat pump located on left wall of enclosure and reverse on left hand. The heat pump shall be installed in the enclosure with one surface and the back flush with the aluminum framing members, and shall be field fastened to the enclosure’s framing. Enclosures constructed with the heat pump located in the center and having no internal seismic protection will not be acceptable.

The heat pump shall be internally supported in the enclosure on a formed 14GA steel heat pump platform, fastened to the aluminum framing members. The weight of the heat pump shall be completely supported on the heat pump platform by the framing members without deflection.

The entire enclosure, including RA/OA plenums, heat pump compartment and access panels shall be insulated with glued on 1.5” 1.5# density, matt faced UL rated ductliner insulation (2” x 3lb insulation available with NC95 rating).

B. The exterior of the enclosure shall be cleaned and painted with a baked on – dry powder coat Paint finish. This finish shall be semi gloss type with raised texture finish of a color approved by the architect. When requested to do so, manufacture shall submit samples of paint color and finish for approval upon submittal of equipment.


Page 23

C. The enclosures base shall be fabricated of 18GA steel and shall be fastened to the framing Members. The base pan shall be provided with Qty 4 5/8” prepunched holes at the four corners to facilitate the installation of seismic hold down devices provided by others 4 adjustable leveling legs will be provided in the 4 base corner to ease in leveling during installation. Enclosure shall be provided with shims with “V” slots in 1/16” and 1/8” thicknesses for use in leveling enclosure on uneven floor surface. Top seismic restraints provided and installed by others shall be installed as shown on the drawings at the top of the enclosure to the classroom’s structural walls.

D. The heat pump section of the enclosure shall be supplied with a full height removable access Door. The access door shall be 18GA steel and shall be installed flush into the front of the enclosure without warp or uneven seams. The access door shall be secured with 2 keyed alike locks at top corners and stationary pins at the door’s bottom to be accepted into the extruded aluminum horizontal cross member and 2 recessed lifting handles. Optional hinged heat pump access door with 2 key locks and 1 recessed handle is acceptable.

E. The RA/OA section shall be supplied with a J&J S90H steel horizontal bar type Grill sized for the return air opening. The RA section shall be supplied with a filter (see equipment schedule) located below the heat pump return air and accessible via a hinged filter box located directly below the heat pump behind the removable heat pump access door. The entire RA/OA mixing box is equipped with a removable access panel to gain access to OA and RA dampers and actuators.

F. The OA/RA section shall be an economizer section with individual OA Damper and RA Damper. Each damper shall have it’s own independent “Belimo” 24v. 2-10vdc actuator. Return air damper shall be “L&D” model GD-1. Outside air damper shall be “L&D” model GD-1, sized as shown on drawings

Provide the following factory installed and wired economizer controls as shown on the control drawings, no substitutions: Honeywell economizer controller, Honeywell OA Temp Sensor, Honeywell SA Temp Sensor, Mitsubishi Room Controller. Sequence of operation shall be as indicated on drawings:

All OA damper operators and related control wiring shall be factory wired and tested. OA control system shall be housed inside a separate low voltage electrical panel mounted inside the heat pump enclosure. Provide with Carrier model #Y66T12-0 control transformer, 120/208/240:24 VAC, 75 VA. Field installation and wiring of the OA control system is not acceptable. The heat pump shall be separately field wired to a 208/220V/1 Phase outside source. Low voltage, 24v field wiring is required to connect the heat pump with the control panel as per the manufacturers wiring diagram.

Installing Mechanical Contractor to provide and install OA louver, and wall sleeve. Trim wall sleeve to length and connect to OA opening. Coordinate complete installation with Specification Section 10200.

G. The enclosure manufacturer shall supply top and side trim fill kits as required and powder Coat painted to match enclosure’s color and texture. Kits shall include filler panels and formed angles designed to attach to the casing and walls. 2 or 3 sided top and trim pieces shall be fabricated from one piece galvanized steel section. Manufacture shall field measure required panel dimensions and include in the submittal package. Enclosure manufacturer to provide ample #8 self tapping screws powder coat painted to match enclosure and corresponding trim pieces. In order to ensure a clean and tight fit of the trim to the enclosure, ceiling and walls, the mechanical contractor shall coordinate with the general contractor to ensure that the necessary blocking and structural support is


Page 24

installed to provide a continuous, clean, flat surface at the trim attachment points to the building walls and ceiling. Side trim to be scribed and notched or trimmed to fit contour of walls to suit site conditions. Ceiling trim shall be field cut by the installing contractor to match the existing ceiling slope. The enclosure manufacturer shall provide a white gasket trim piece as manufactured by “Trimlok” (Part No. 1620SW3-342) where the supply air duct exits the closure panels. This gasket will form a finished closure trim and will be installed by the mechanical contractor.

H. Heat pump enclosure manufacturer must submit a DSA structural engineering report by a California licensed structural engineer.

I. If other than specified, heat pump enclosure manufacturer shall supply complete detailed Drawing of unit construction at time of submittal. In addition a fully operational unit shall be fabricated for inspection before approval.

J. Classroom heat pump enclosure manufacturer shall have a minimum of five years experience in manufacturing this type of product and shall be able to substantiate installations of same during the last 2 years. Equipment proposed not meeting this requirement is not acceptable.

2.08 MITSUBISHI CITY MULTI SYSTEM

A. System Description:

1. The variable capacity, heat pump heat recovery air conditioning system shall be a Mitsubishi Electric CITY MULTI VRFZ (Variable Refrigerant Flow Zoning). The CITY MULTI VRFZ systems shall be the R2-Series (simultaneous cooling and heating) split system heat pump and the Y-Series (cool/heat) split system heat pump.

2. The R2-Series system shall consist of a PURY outdoor unit, BC (Branch Circuit) Controller, multiple indoor units (-E models), and M-NET DDC (Direct Digital Controls). Each indoor unit or group of indoor units shall be capable of operating in any mode independently of other indoor units or groups. System shall be capable of changing mode (cooling to heating, heating to cooling) with no interruption to system operation. Each indoor unit or group of indoor units shall be independently controlled. The sum of connected capacity of all indoor air handlers shall range from 50% to 150% of outdoor rated capacity.

3. The Y-Series system shall consist of PUHY outdoor unit, multiple indoor units (-E models), and M-NET DDC (Direct Digital Controls). The sum of connected capacity of all indoor air handlers shall range from 50% to 130% of outdoor rated capacity.

B. Quality Assurance:

1. The units shall be listed by Electrical Laboratories (ETL) and bear the ETL label.

2. All wiring shall be in accordance with the National Electrical Code (N.E.C.).

3. The units shall be manufactured in a facility registered to ISO 9001 and ISO14001 which is a set of standards applying to environmental protection set by the International Standard Organization (ISO).


Page 25

4. A full charge of R-410A for the condensing unit shall be provided in the condensing unit.

C. Delivery, Storage and Handling:

1. Unit shall be stored and handled according to the manufacturer’s recommendation.

D. Warranty:

1. The units shall be covered by the manufacturer’s limited warranty for a period of one (1) year from date of installation.

2. If the systems are:

a. Designed by a certified CITY MULTI Diamond Designer,

b. Installed by a certified CITY MULTI Diamond Dealer, AND

c. Verified with a completed commissioning report submitted to Mitsubishi Electric Service Department, then the units shall be covered by an extended manufacturer’s limited warranty for a period of five (5) years from date of installation.

3. In addition the compressor shall have a manufacturer’s limited warranty for a period of six (6) years from date of installation.

4. If, during this period, any part should fail to function properly due to defects in workmanship or material, it shall be replaced or repaired at the discretion of the manufacturer.

5. This warranty shall not include labor.

E. Experience: Manufacturer shall have a minimum of twenty-five years of HVAC experience in the U.S. market.

F. Installation:

1. The CITY MULTI VRFZ system shall be installed by a Contractor who is a Mitsubishi authorized CITY MULTI Diamond Dealer/Diamond Installer. This certification and training shall be provided to the installing Contractor by Mitsubishi. Additionally, the installing Contractor shall provide proof of completion of installation of a minimum of two variable flow refrigerant systems within the last 4 years.

G. R2-Series Outdoor Unit:

1. General:

a. The R2-Series PURY outdoor unit shall be used specifically with CITY MULTI VRFZ components. The PURY outdoor units shall be equipped with multiple circuit boards that interface to the M-NET controls system and shall perform all functions necessary for operation. Each outdoor unit module shall be completely factory assembled, piped and wired and run tested at the factory.


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2. The model nomenclature and unit requirements are shown below. All units requiring a factory supplied twinning kits shall be piped together in the field, without the need for equalizing line(s).

Outdoor Unit Model Nomenclature

208/230 Volt Twinning Kit

460 Volt Twinning Kit

Model Number Units Model Number Units

PURY-P72TLMU (1) PURY-P72TLMU

None PURY-P72YLMU (1) PURY-P72YLMU

None

PURY-P96TLMU (1) PURY-P96TLMU

None PURY-P96YLMU (1) PURY-P96YLMU

None

PURY-P120TLMU

(1) PURY-P120TLMU

None PURY-

P120YLMU (1) PURY-P120YLMU

None

PURY-P144TSLMU

(2) PURY-P72TLMU

CMY-R100VBK

PURY-P144YSLMU

(2) PURY-P72YLMU

CMY-R100VBK

PURY-P168TSLMU

(1) PURY-P96TLMU (1) PURY-P72TLMU

CMY-R100VBK

PURY-P168YSLMU

(1) PURY-P96YLMU (1) PURY-P72YLMU

CMY-R100VBK

PURY-P192TSLMU

(2) PURY-P96TLMU

CMY-R100VBK

PURY-P192YSLMU

(2) PURY-P96YLMU

CMY-R100VBK

PURY-P216TSLMU

(1) PURY-P96TLMU (1) PURY-P120TLMU

CMY-R100VBK

PURY-P216YSLMU

(1) PURY-P96YLMU (1) PURY-P120YLMU

CMY-R100VBK

PURY-P240TSLMU

(2) PURY-P120TLMU

CMY-R100VBK

PURY-P240YSLMU

(2) PURY-P120YLMU

CMY-R100VBK

3. Outdoor unit shall have a sound rating no higher than 60 dB(A) individually or 63 dB(A) twinned. Units shall have a sound rating no higher than 50 dB(A) individually or 53 dB(A) twinned while in night mode operation.

4. Both refrigerant lines from the outdoor unit to the BC (Branch Circuit) Controller (Single or Main) shall be insulated.

5. There shall be no more than 3 branch circuit controllers connected to any one outdoor unit.

6. Outdoor unit shall be able to connect to up to 50 indoor units depending upon model.

7. The outdoor unit shall have an accumulator with refrigerant level sensors and controls.

8. The outdoor unit shall have a high pressure safety switch, over-current protection, crankcase heater and DC bus protection.

9. The outdoor unit shall have the ability to operate with a maximum height difference of 164 feet and have total refrigerant tubing length of 1804-2625 feet. The greatest length is not to exceed 541 feet between outdoor unit and the indoor units without the need for line size changes or traps.


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10. The outdoor unit shall be capable of operating in heating mode down to -4F ambient temperature or cooling mode down to 23F ambient temperature, without additional low ambient controls.

11. The outdoor unit shall not cease operation in any mode based solely on outdoor ambient temperature.

12. The outdoor unit shall have a high efficiency oil separator plus additional logic controls to ensure adequate oil volume in the compressor is maintained.

13. Unit Cabinet:

a. The casing(s) shall be fabricated of galvanized steel, bonderized and finished. Units cabinets shall be able to withstand 960 hours per ASTM B117 criteria for seacoast protected models (–BS models).

14. Fan:

a. Each outdoor unit module shall be furnished with one direct drive, variable speed propeller type fan. The fan shall be factory set for operation under 0 in. WG external static pressure, but capable of normal operation under a maximum of 0.24 in. WG external static pressure via dipswitch.

b. All fan motors shall have inherent protection, have permanently lubricated bearings, and be completely variable speed.

c. All fan motors shall be mounted for quiet operation.

d. All fans shall be provided with a raised guard to prevent contact with moving parts.

e. The outdoor unit shall have vertical discharge airflow.

15. Refrigerant:

a. R410A refrigerant shall be required for PURY-P-T/Y(S)HMU-A outdoor unit systems.

16. Coil:

a. The outdoor coil shall be of nonferrous construction with lanced or corrugated plate fins on copper tubing.

b. The coil fins shall have a factory applied corrosion resistant blue-fin finish.

c. The coil shall be protected with an integral metal guard.

d. Refrigerant flow from the outdoor unit shall be controlled by means of an inverter driven compressor.

e. The outdoor coil shall include 4 circuits with two position valves for each circuit, except for the last stage.


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17. Compressor:

a. Each outdoor unit module shall be equipped with one inverter driven scroll hermetic compressor. Non inverter-driven compressors shall not be allowed.

b. A crankcase heater(s) shall be factory mounted on the compressor(s).

c. The outdoor unit compressor shall have an inverter to modulate capacity. The capacity shall be completely variable with a turndown of 19%-8% of rated capacity, depending upon unit size.

d. The compressor will be equipped with an internal thermal overload.

e. The compressor shall be mounted to avoid the transmission of vibration.

18. Electrical:

a. The outdoor unit electrical power shall be 208/230 or 460 volts, 3-phase, 60 hertz.

b. The outdoor unit shall be capable of satisfactory operation within voltage limits of 187-228 volts (208V/60Hz), 207-253V (230V/60Hz) or 414-506V (460V/60Hz).

c. The outdoor unit shall be controlled by integral microprocessors.

d. The control circuit between the indoor units, BC Controller and the outdoor unit shall be 24VDC completed using a 2-conductor, twisted pair shielded cable to provide total integration of the system.

H. Branch Circuit (BC) Controllers For R2-Series Systems:

1. General:

a. The BC (Branch Circuit) Controllers shall be specifically used with R410A R2-Series systems. These units shall be equipped with a circuit board that interfaces to the M-NET controls system and shall perform all functions necessary for operation. The unit shall have a galvanized steel finish. The BC Controller shall be completely factory assembled, piped and wired. Each unit shall be run tested at the factory. This unit shall be mounted indoors, with access and service clearance provided for each controller. The sum of connected capacity of all indoor air handlers shall range from 50% to 150% of rated capacity.

2. BC Unit Unit Cabinet:

a. The casing shall be fabricated of galvanized steel.

b. Each cabinet shall house a liquid-gas separator and multiple refrigeration control valves.

c. The unit shall house two tube-in-tube heat exchangers.

3. Refrigerant:


Page 29

a. R410A refrigerant shall be required.

4. Refrigerant Valves:

a. The unit shall be furnished with multiple branch circuits which can individually accommodate up to 54,000 BTUH and up to three indoor units. Branches may be twinned to allow more than 54,000 BTUH.

b. Each branch shall have multiple two-position valves to control refrigerant flow.

c. Service shut-off valves shall be field-provided/installed for each branch to allow service to any indoor unit without field interruption to overall system operation.

d. Linear electronic expansion valves shall be used to control the variable refrigerant flow.

5. Integral Drain Pan:

a. An integral condensate pan and drain shall be provided.

6. Electrical:

a. The unit electrical power shall be 208/230 volts, 1 phase, 60 hertz.

b. The unit shall be capable of satisfactory operation within voltage limits of 187-228 volts (208V/60Hz) or 207-253V (230V/60Hz).

c. The BC Controller shall be controlled by integral microprocessors.

d. The control circuit between the indoor units and the outdoor unit shall be 24VDC completed using a 2-conductor, twisted pair shielded cable to provide total integration of the system.

I. Y-Series Outdoor Unit:

1. General:

a. The Y-Series PUHY outdoor unit shall be specifically used with CITY MULTI VRFZ components. The PUHY outdoor units shall be equipped with multiple circuit boards that interface to the M-NET controls system and shall perform all functions necessary for operation. Each outdoor unit module shall be completely factory assembled, piped, wired and run tested at the factory.

2. The model nomenclature and unit requirements are shown below. All units requiring a factory supplied twinning kit shall be piped together in the field, without the need for equalizing line(s).

Outdoor Unit Model Nomenclature 208/230 Volt Twinning Kit 460 Volt Twinning Kit


Page 30

Model Number Units Model Number Units

PUHY-P72TLMU (1) PUHY-P72TLMU

None PUHY-

P72YHMU (1) PUHY-P72YLMU None

PUHY-P96TLMU (1) PUHY-P96TLMU

None PUHY-

P96YHMU (1) PUHY-P96YLMU None

PUHY-P120TLMU

(1) PUHY-P120TLMU

None PUHY-

P120YHMU (1) PUHY-P120YLMU

None

PUHY-P144TSLMU

(2) PUHY-P72TLMU

CMY-Y100VBKPUHY-

P144YSHMU (2) PUHY-P72YLMU

CMY-Y100VBK

PUHY-P168TSLMU

(1) PUHY-P96TLMU (1) PUHY-P72TLMU

CMY-Y100VBKPUHY-

P168YSHMU (1) PUHY-P96YLMU (1) PUHY-P72YLMU

CMY-Y100VBK

PUHY-P192TSLMU

(2) PUHY-P96TLMU

CMY-Y100VBKPUHY-


CMY-Y100VBK

PUHY-P216TSLMU


CMY-Y100VBKPUHY-

P216YSHMU

(1) PUHY-P96YLMU (1) PUHY-P120YLMU

CMY-Y100VBK

PUHY-P240TSLMU

(2) PUHY-P120TLMU

CMY-Y100VBKPUHY-


CMY-Y100VBK

PUHY-P264TSLMU


CMY-Y300VBK2

PUHY-P264YSHMU


CMY-Y300VBK2

PUHY-P288TSLMU

(1) PUHY-P72TLMU (1) PUHY-P96YLMU (1) PUHY-P120TLMU

CMY-Y300VBK2

PUHY-P288YSHMU


(1) PUHY-P120YLMU

CMY-Y300VBK2

PUHY-P312TSLMU


CMY-Y300VBK2

PUHY-P312YSHMU


CMY-Y300VBK2

PUHY-P338TSLMU


CMY-Y300VBK2

PUHY-P338YSHMU


CMY-Y300VBK2

PUHY-P360TLMU

(3) PUHY-P120TLMU

CMY-Y300VBK2

PUHY-P360YHMU

(3) PUHY-P120YLMU

CMY-Y300VBK2

3. Outdoor unit shall have a sound rating no higher than 60 dB(A) individually or 65 dB(A) twinned. Units shall have a sound rating no higher than 50 dB(A) individually or 55 dB(A) twinned while in night mode operation.

4. Outdoor unit shall be able to connect to up to 50 indoor units depending upon model.

5. Both refrigerant lines from the outdoor unit to indoor units shall be insulated.

6. The outdoor unit shall have an accumulator with refrigerant level sensors and controls.


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7. The outdoor unit shall have a high pressure safety switch, over-current protection and DC bus protection.

8. The outdoor unit shall have the ability to operate with a maximum height difference of 164 feet (294 feet optional) and have a total refrigerant tubing length of 3280 feet. The greatest length is not to exceed 541 feet between the outdoor unit and the indoor units without the need for line size changes or traps.

9. The outdoor unit shall be capable of operating in heating mode down to -4F ambient temperature or cooling mode down to 23F ambient temperature, without additional low ambient controls.

10. The outdoor unit shall have a high efficiency oil separator plus additional logic controls to ensure adequate oil volume in the compressor is maintained.

11. Unit Cabinet:

a. The casing(s) shall be fabricated of galvanized steel, bonderized and finished. Units cabinets shall be able to withstand 960 hours per ASTM B117 criteria for seacoast protected models (–BS models).

12. Fan:

a. Each outdoor unit module shall be furnished with one direct drive, variable speed propeller type fan.

b. The fan motor shall have inherent protection, have permanently lubricated bearings, and be completely variable speed. The fan shall be factory set for operation under 0 in. WG external static pressure, but capable of normal operation under a maximum of 0,24 in. WG external static pressure via dipswitch.

c. The fan motor shall be mounted for quiet operation.

d. The fan shall be provided with a raised guard to prevent contact with moving parts.

e. The outdoor unit shall have vertical discharge airflow.

13. Refrigerant:

a. R410A refrigerant shall be required for PUHY-T/Y(S)LMU-A outdoor unit systems.

14. Coil:

a. The outdoor coil shall be of nonferrous construction with lanced or corrugated plate fins on copper tubing.

b. The coil fins shall have a factory applied corrosion resistant blue-fin finish.

c. The coil shall be protected with an integral metal guard.


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d. Refrigerant flow from the outdoor unit shall be controlled by means of an inverter driven compressor.

e. The outdoor coil shall include 4 circuits with two position valves for each circuit, except for the last stage.

15. Compressor:

a. Each outdoor unit module shall be equipped with one inverter driven scroll hermetic compressor. Non inverter-driven compressors shall not be allowed.

b. A crankcase heater(s) shall be factory mounted on the compressor(s).

c. The outdoor unit compressor shall have an inverter to modulate capacity. The capacity shall be completely variable with a turndown of 18%-4% of rated capacity, depending upon unit size.

d. The compressor shall be equipped with an internal thermal overload.

e. The compressor shall be mounted to avoid the transmission of vibration.

16. Electrical:

a. The outdoor unit electrical power shall be 208/230 or 460 volts, 3-phase, 60 hertz.

b. The unit shall be capable of satisfactory operation within voltage limitations of 187-228 volts (208V/60Hz) or 207-253 volts (230V/60Hz) or 414-506V (460V/60Hz).

c. The outdoor unit shall be controlled by integral microprocessors.

d. The control circuit between the indoor units and the outdoor unit shall be 24VDC completed using a 2-conductor, non-polar twisted pair shielded cable to provide total integration of the system.

J. PKFY (Wall Mounted) Indoor Unit:

1. General:

a. The PKFY shall be wall-mounted indoor unit section and shall have a modulating linear expansion device. The PKFY shall be used with the R2-Series outdoor unit and BC Controller, Y-Series outdoor unit, or S-Series outdoor unit. The PKFY shall support individual control using M-NET DDC controllers.

2. Indoor Unit:

a. The indoor unit shall be factory assembled, wired and run tested. Contained within the unit shall be all factory wiring, piping, electronic modulating linear expansion device, control circuit board and fan motor. The unit shall have a self-diagnostic function, 3-minute time delay mechanism, an auto restart function, and a test run switch. Indoor unit


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and refrigerant pipes shall be charged with dehydrated air before shipment from the factory.

3. Unit Cabinet:

a. The casing shall have a white finish.

b. Multi directional drain and refrigerant piping offering four (4) directions for refrigerant piping and two (2) directions for draining shall be standard.

c. There shall be a separate back plate which secures the unit firmly to the wall.

4. Fan:

a. The indoor fan shall be an assembly with one or two line-flow fan(s) direct driven by a single motor.

b. The indoor fan shall be statically and dynamically balanced to run on a motor with permanently lubricated bearings.

c. A manual adjustable guide vane shall be provided with the ability to change the airflow from side to side (left to right).

d. A motorized air sweep louver shall provide an automatic change in airflow by directing the air up and down to provide uniform air distribution.

5. Filter:

a. Return air shall be filtered by means of an easily removable, washable filter.

6. Coil:

a. The indoor coil shall be of nonferrous construction with smooth plate fins on copper tubing.

b. The tubing shall have inner grooves for high efficiency heat exchange.

c. All tube joints shall be brazed with phos-copper or silver alloy.

d. The coils shall be pressure tested at the factory.

e. A condensate pan and drain shall be provided under the coil.

f. Both refrigerant lines to the PKFY indoor units shall be insulated.

7. Electrical:

a. The unit electrical power shall be 208/230 volts, 1-phase, 60 hertz.

b. The system shall be capable of satisfactory operation within voltage limits of 187-228 volts (208V/60Hz) or 207-253 volts (230V/60Hz).


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8. Controls:

a. This unit shall use controls provided by Mitsubishi Electric to perform functions necessary to operate the system. Please refer to Part 5 of this guide specification for details on controllers and other control options.

K. PLFY-P**NBMU-E (4-Way Ceiling-Recessed Cassette With Grille) Indoor Unit:

1. General:

a. The PLFY-P**NBMU-E shall be a four-way cassette style indoor unit that recesses into the ceiling with a ceiling grille. The indoor unit shall be factory assembled, wired and run tested. Contained within the unit shall be all factory wiring, piping, electronic modulating linear expansion device, control circuit board and fan motor. The unit shall have a self-diagnostic function, 3-minute time delay mechanism, an auto restart function, an emergency operation function, a test run switch, and the ability to adjust airflow patterns for different ceiling heights. Indoor unit and refrigerant pipes shall be charged with dehydrated air before shipment from the factory.

2. Unit Cabinet:

a. The cabinet shall be space-saving ceiling-recessed cassette.

b. The cabinet panel shall have provisions for a field installed filtered outside air intake.

c. Branch ducting shall be allowed from cabinet.

d. Four-way grille shall be fixed to bottom of cabinet allowing two, three or four-way blow.

e. The grille vane angles shall be individually adjustable from the wired remote controller to customize the airflow pattern for the conditioned space.

3. Fan:

a. The indoor fan shall be an assembly with a turbo fan direct driven by a single motor.


c. The indoor fan shall consist of five (5) speed settings, Low, Mid1, Mid2, High and Auto.

d. The fan shall have a selectable Auto fan setting that will adjust the fan speed based on the difference between controller set-point and space temperature.

e. The indoor unit shall have an adjustable air outlet system offering 4-way airflow, 3-way airflow, or 2-way airflow.


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f. The indoor unit shall have switches that can be set to provide optimum airflow based on ceiling height and number of outlets used.

g. The indoor unit vanes shall have 5 fixed positions and a swing feature that shall be capable of automatically swinging the vanes up and down for uniform air distribution.

h. The vanes shall have an Auto-Wave selectable option in the heating mode that shall randomly cycle the vanes up and down to evenly heat the space.

i. If specified, the grille shall have an optional i-see sensor that will measure room temperature variations and adjust the airflow accordingly to evenly condition the space.

4. Filter:

a. Return air shall be filtered by means of a long-life washable filter.

5. Coil:






f. The unit shall be provided with an integral condensate lift mechanism that will be able to raise drain water 33 inches above the condensate pan.

g. Both refrigerant lines to the PLFY indoor units shall be insulated.

6. Electrical:



7. Controls:

a. This unit shall use controls provided by Mitsubishi Electric to perform functions necessary to operate the system.

L. PLFY-P**NCMU-E (4 Way Ceiling-Recessed Cassette With Grille) Indoor Unit:

1. General:


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a. The PLFY-P**NCMU-E shall be a four-way cassette style indoor unit that recesses into the ceiling with a ceiling grille. The indoor unit shall be factory assembled, wired and run tested. Contained within the unit shall be all factory wiring, piping, electronic modulating linear expansion device, control circuit board and fan motor. The unit shall have a self-diagnostic function, 3-minute time delay mechanism, an auto restart function, an emergency operation function and a test run switch. Indoor unit and refrigerant pipes shall be charged with dehydrated air before shipment from the factory.

2. Unit Cabinet:

a. The cabinet shall be a compact 22-7/16” wide x 22-7/16” deep so it will fit within a standard 24” square suspended ceiling grid.


c. Four-way grille shall be fixed to bottom of cabinet allowing two, three or four-way blow.

3. Fan:

a. The indoor fan shall be an assembly with a turbo fan direct driven by a single motor.


c. The indoor fan shall consist of three (3) speeds, Low, Mid, and High.

d. The indoor unit shall have an adjustable air outlet system offering 4-way airflow, 3-way airflow, or 2-way airflow.

e. The auto air swing vanes shall be capable of automatically swinging up and down for uniform air distribution.

4. Filter:

a. Return air shall be filtered by means of a long-life washable filter.

5. Coil:







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f. The unit shall be provided with an integral condensate lift mechanism that will be able to raise drain water 19-3/4” inches above the condensate pan.

g. Both refrigerant lines to the PLFY indoor units shall be insulated.

6. Electrical:



7. Controls:


M. PMFY (1-Way Ceiling-Recessed Cassette With Grille) Indoor Unit:

1. General:

a. The PMFY shall be a one-way cassette indoor unit that recesses into the ceiling with a ceiling grille and shall have a modulating linear expansion device. The PMFY shall be used with the R2-Series outdoor unit and BC Controller, Y-Series outdoor unit, or S-Series outdoor unit. The PMFY shall support individual control using M-NET DDC controllers.

2. Indoor Unit:

a. The indoor unit shall be factory assembled, wired and run tested. Contained within the unit shall be all factory wiring, piping, electronic modulating linear expansion device, control circuit board and fan motor. The unit shall have a self-diagnostic function, 3-minute time delay mechanism, an auto restart function, an emergency operation function and a test run switch. Indoor unit and refrigerant pipes shall be charged with dehydrated air before shipment from the factory.

3. Unit Cabinet:

a. The cabinet shall be space-saving ceiling recessed.


c. Branch ducting shall be allowed from cabinet.

d. The one-way grille shall be fixed to bottom of cabinet allowing for one-way airflow.

4. Fan:

a. The indoor fan shall be an assembly with one line-flow fan direct driven by a single motor.


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c. The indoor fan shall consist of four (4) speeds, Low, Mid1, Mid2, and High.

5. Filter:

a. Return air shall be filtered by means of a long-life washable permanent filter.

6. Coil:






f. The unit shall be provided with an integral condensate lift mechanism able to raise drain water 23 inches above the condensate pan.

g. Both refrigerant lines to the PMFY indoor units shall be insulated.

7. Electrical:



8. Controls:

a. This unit shall use controls provided by Mitsubishi Electric to perform functions necessary to operate the system. Please refer to Part 5 of this guide specification for details on controllers and other control options.

N. PVFY-P**-E00A Vertical Air Handler:

1. General:

a. The PVFY shall be a vertical ducted indoor fan coil design with a fixed bottom return, a fixed vertical discharge supply, and a modulating linear expansion device. The unit shall have the capability to be mounted in either the vertical or horizontal (left position only) and have the capability to integrate into systems with various types of indoor units connected. The PVFY shall be used with the R2-Series outdoor unit and BC Controller, Y-Series outdoor unit, or S-Series outdoor unit. The PVFY shall support individual control using M-NET DDC controllers. Units shall


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have the ability to control supplemental heat via connector Cn24 and a 12 VDC output.

2. Indoor Unit:

a. The indoor unit shall be factory assembled, wired and run tested. Contained within the unit shall be all factory wiring, piping, electronic modulating linear expansion device, control circuit board and fan motor. The unit shall have a self-diagnostic function, 3-minute time delay mechanism, and an auto restart function. Indoor unit and refrigerant pipes shall be charged with dehydrated air before shipment from the factory.

3. Unit Cabinet:

a. The cabinet shall be prepainted, preinsultated, 22 gauge galvanized steel.

4. Fan:

a. The indoor unit fan shall be an assembly with a single direct drive fan with a high efficiency DC motor.

b. The indoor fan shall be statically and dynamically balanced and run on a motor with permanently lubricated bearings.

c. The indoor unit shall have a ducted air outlet system and ducted return air system.

d. The fan shall have 3-speeds with the capability to operate between 0.3-0.5 In.W.G. selectable.

5. Filter:

a. The contractor shall provide a field fabricated filter rack.

6. Coil:






f. The condensate shall be gravity drained from the fan coil.

g. Both refrigerant lines to the PVFY indoor units shall be insulated.

7. Electrical:


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8. Controls:


O. Controls Overview:

1. General:

a. The CITY MULTI Controls Network (CMCN) shall be capable of supporting remote controllers, schedule timers, system controllers, centralized controllers, an integrated web based interface, graphical user workstation, and system integration to Building Management Systems via BACnet® and LonWorks®.

P. Electrical Characteristics:

1. General:

a. The CMCN shall operate at 24VDC. Controller power and communications shall be via a common non-polar communications bus.

2. Wiring:

a. Control wiring shall be installed in a system daisy chain configuration from indoor unit to ME remote controller to indoor unit, to the BC controller (main and subs, if applicable) and to the outdoor unit. Control wiring to remote controllers shall be run from the indoor unit terminal block to the controller associated with that unit.

b. Control wiring for schedule timers, system controllers, and centralized controllers shall be installed in a daisy chain configuration from outdoor unit to outdoor unit, to system controllers, to the power supply.

c. Control wiring for the Deluxe MA, Simple MA, and Wireless MA remote controllers shall be from the remote controller to the first associated indoor unit (TB-15) then to the remaining associated indoor units (TB-15) in a daisy chain configuration.

d. The AG-150A, G-50A and GB-50A system controller shall be capable of being networked with other AG-150A, G-50A and GB-50A system controllers for web based control.

3. Wiring Type:

a. Wiring shall be 2-conductor (16 AWG), twisted shielded pair, stranded wire, as defined by the Design Tool AutoCAD output.

b. Network wiring shall be CAT-5e with RJ-45 connection.


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Q. CITY MULTI Controls Network:

1. The CITY MULTI Controls Network (CMCN) consists of remote controllers, schedule timers, system controllers, centralized controllers, and/or integrated web based interface communicating over a high-speed communication bus. The CITY MULTI Controls Network shall support operation monitoring, scheduling, error email distribution, personal browsers, tenant billing, online maintenance support, and integration with Building Management Systems (BMS) using either LonWorks® or BACnet® interfaces. The below figure illustrates a sample CMCN System Configuration.

R. CMCN: Remote Controllers:

1. Deluxe MA Remote Controller (PAR-21MAA).

a. The Deluxe MA Remote Controller (PAR-21MAA) shall be capable of controlling up to 16 indoor units (defined as 1 group). The Deluxe MA Remote Controller shall be approximately 5” x 5” in size and white in color with a light-green LCD display. The PAR-21MAA shall support a selection from multiple languages (Spanish, German, Japanese, Chinese, English, Russian, Italian, or French) for display information. The Deluxe MA supports temperature display selection of Fahrenheit or Celsius. The Deluxe MA Remote Controller shall control the following grouped operations: On/Off, Operation Mode (cool, heat, auto (R2-Series only), dry, and fan), temperature set point, fan speed setting, and airflow direction setting. The Deluxe MA Remote Controller shall support timer settings of on/off/temperature up to 8 times in a day in 1-minute increments. The Deluxe MA Remote Controller shall support an Auto Off timer. The Deluxe MA Remote Controller shall be able to limit the set temperature range from the Deluxe MA. The room temperature shall be sensed at either the Deluxe MA Remote Controller or the Indoor Unit dependent on the indoor unit dipswitch setting. The Deluxe MA Remote Controller shall display a four-digit error code in the event of system abnormality/error.

b. The Deluxe MA Remote Controller shall only be used in the same group with other Deluxe MA Remote Controllers (PAR-21MAA), Wireless MA (PAR-FL32MA / PAR-FA32MA), or Simple MA Remote Controllers (PAC-YT51CRB), with up to two remote controllers per group.


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c. The Deluxe MA Remote Controller shall require no addressing. The Deluxe MA Remote Controller shall connect using two-wire, stranded, non-polar control wire to TB15 connection terminal on the indoor unit. The PAR-21MAA shall require cross-over wiring for grouping across indoor units.

PAR-21MAA (Deluxe MA Remote Controller)

Item Description Operation Display ON/OFF Run and stop operation for a single group Each

Group Each Group

Operation Mode

Switches between Cool/Dry/Auto/Fan/Heat. Operation modes vary depending on the air conditioner unit. Auto mode is in the R2-Series only.

Each Group

Each Group

Temperature Setting

Sets the temperature for a single group. Range of tem-perature setting Cool/Dry: 67°F-87°F (57°F-87°F for PEFY/PDFY/PFFY-E) Heat: 63°F-83°F (63°F-83°F for PEFY/PDFY/PFFY-E) Auto: 67°F-83°F (63°F-83°F for PEFY/PDFY/PFFY-E)

Each Group

Each Group

Fan Speed Setting

Models with 4 air flow speed settings: Hi/Mid-2/Mid-1/Low Models with 3 air flow speed settings: Hi/Mid/Low Models with 2 air flow speed settings: Hi/Low

Each Group

Each Group

Air Flow Direc-tion Setting

Air flow direction angles 100%-80%-60%-40%, Swing, Louver ON/OFF. Air flow direction settings vary depending on the model.

Each Group

Each Group

Weekly Scheduler

ON/OFF/Temperature setting can be done up to 8 times one day in the week. The time can be set by the 1-minute interval.

Each Group

Each Group

Permit / Pro-hibit Local Operation

Individually prohibit operation of each local remote control function (Start/Stop, Change operation mode, Set tem-perature, Reset filter).

*1: Centrally Controlled is displayed on the re-mote controller for prohibited functions.

N/A Each Group *1

Prohibition / Permission of Specified Mode

Setting via the System Controller, the operation for the following modes is prohibited: Cooling Prohibited: Cool, Dry, Auto Heating Prohibited: Heat, Auto Cooling-Heating Prohibited: Cool, Heat, Dry, Auto

N/A Each Group

Display Indoor Unit Intake Temp

Measures and displays the intake temperature of the in-door unit when the indoor unit is operating.

N/A Each Group

Error When an error is currently occurring on an air conditioner unit, the afflicted unit and the error code are displayed

N/A Each Unit

Test Run Operates air conditioner units in test run mode. Each Group

Each Group

Ventilation Equipment

Up to 16 indoor units can be connected to an interlocked system that has one LOSSNAY unit. LOSSNAY items that can be set are “Hi”, “Low”, and “Stop”. Ventilation mode switching is not available.

Each Group

Each Group

Set Tempera-ture Range Limit

The range of room temperature setting can be limited by the initial setting. The lowest limit temperature can be made higher than the usual (67°F) in cool/dry mode, while the upper limit temperature lower than the usual (83°F) in heat mode. *Function does not work in auto mode setting

Each Group

Each Group


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PAR-21MAA (Deluxe MA Remote Controller) Item Description Operation Display Auto Lock Out Function

Setting/releasing of simplified locking for remote control buttons can be performed.

Locking of all buttons Locking of all buttons except ON/OFF button

Each Group

Each Group

2. Simple MA Remote Controller (PAC-Y151CRB):

a. The Simple MA Remote Controller (PAC-YT51CRB) shall be capable of controlling up to 16 indoor units (defined as 1 group). The Simple MA Remote Controller shall be compact in size, approximately 3” x 5” and have limited user functionality. The Simple MA supports temperature display selection of Fahrenheit or Celsius. The Simple MA Remote Controller shall allow the user to change on/off, mode (cool, heat, auto (R2-Series only), dry, and fan), temperature setting, and fan speed setting. The Simple MA Remote Controller shall be able to limit the set temperature range from the Simple MA The room temperature shall be sensed at either the Simple MA Remote Controller or the Indoor Unit dependent on the indoor unit dipswitch setting. The Simple MA Remote Controller shall display a four-digit error code in the event of system abnormality/error.

b. The Simple MA Remote Controller shall only be used in same group with PAR-21MAA (Deluxe MA Remote Controllers), Wireless MA (PAR-FL32MA-E / PAR-FA32MA-E), or with other PAC-YT51CRB (Simple MA Remote Controllers), with up to two remote controllers per group.

c. The Simple MA Remote Controller shall require no addressing. The Simple MA Remote Controller shall connect using two-wire, stranded, non-polar control wire to TB15 connection terminal on the indoor unit. The PAC-YT51CRB shall require cross-over wiring for grouping across indoor units.

PAC-YT51CRB (Simple MA Remote Controller)


Group Each Group

Operation Mode

Switches between Cool/Dry/Auto/Fan/Heat. Operation modes vary depending on the air conditioner unit. Auto mode is in the R2-Series only.

Each Group

Each Group

Temperature Setting

Sets the temperature for a single group. Range of tempera-ture setting Cool/Dry: 67°F-87°F (57°F-87°F for PEFY/PDFY/PFFY-E) Heat: 63°F-83°F (63°F-83°F for PEFY/PDFY/PFFY-E) Auto: 67°F-83°F (63°F-83°F for PEFY/PDFY/PFFY-E)

Each Group

Each Group

Fan Speed Setting

Models with 4 air flow speed settings: Hi/Mid-2/Mid-1/Low Models with 3 air flow speed settings: Hi/Mid/Low Models with 2 air flow speed settings: Hi/Low

Each Group

Each Group

Air Flow Di-rection Set-ting

Not Available N/A N/A


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PAC-YT51CRB (Simple MA Remote Controller) Item Description Operation Display Timer Opera-tion



Individually prohibit operation of each local remote control function (Start/Stop, Change operation mode, Set tempera-ture, Reset filter).

*1: Centrally Controlled is displayed on the remote controller for prohibited functions.

N/A Each Group *1

Display In-door Unit In-take Temp


Error When an error is currently occurring on an air conditioner unit, the afflicted unit and the error code are displayed

N/A Each Unit

Test Run Operates air conditioner units in test run mode. *2 The display for test run mode will be the same as for normal start/stop (does not display “test run”).

Each Group

Each Group *2


Up to 16 indoor units can be connected to an interlocked system that has one LOSSNAY unit. LOSSNAY items that can be set are “Hi”, “Low”, and “Stop”. Ventilation mode switching is not available.

Each Group

Each Group

Set Tempera-ture Range Limit

The range of room temperature setting can be limited Each Group

Each Group

The range of room temperature setting can be limited by the initial setting. The lowest limit temperature can be made higher than the usual (67°F) in cool/dry mode, while the upper limit temperature lower than the usual (83°F) in heat mode. *Function does not work in auto mode setting

Each Group

Each Group

S. Centralized Controller:

1. EB-50GU-A Centralized Controller.

a. The EB-50GU-A Centralized Controller shall be capable of controlling via a PC a maximum of 50 indoor units across multiple CITY MULTI outdoor units. A field supplied PC shall be required for the EB-50GU-A Centralized Controller. The EB-50GU-A Centralized Controller shall be approximately 5”x11” in size and shall be powered from a Power Supply Unit (PAC-SC50KUA). The EB-50GU-A Centralized Controller shall support operation superceding that of the remote controllers, system configuration, daily/weekly/annual scheduling, monitoring of operation status, error email notification, online maintenance tool and malfunction monitoring. The EB-50GU-A Centralized Controller shall have basic operation controls which can be applied to an individual indoor unit, a group of indoor units (up to 50 indoor units), or all indoor units (collective batch operation). This basic control set of operation controls for the EB-50GU-A Centralized Controller shall include on/off, operation mode selection (cool, heat, auto (R2-Series only), dry, and fan), temperature setting, fan speed setting, airflow direction setting, error email notification, and online maintenance. Since the EB-50GU-A provides centralized control it shall be able to enable or disable operation of local remote controllers via the PC. In terms of scheduling, the EB-50GU-A Centralized Controller shall allow the user to define daily, weekly, and


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annual schedules with operations consisting of ON/OFF, mode selection, temperature setting, and permit/prohibit of remote controllers.

EB-50GU-A (Centralized Controller)


Group or Collective

Each Group or Collective

Operation Mode

Switches between Cool/Dry/Auto/Fan/Heat. (Group of Lossnay unit: automatic ventilation/vent-heat/interchange/normal ventilation) Operation modes vary depending on the air conditioner unit. Auto mode is in the CITY MULTI R2-Series only.

Each Group

or Collec-tive

Each Group

Temperature Setting

Sets the temperature for a single group. Range of temperature setting: Cool/Dry: 67°F-87°F (57°F-87°F for PEFY/PDFY/PFFY-E) Heat: 63°F-83°F (63°F-83°F for PEFY/PDFY/PFFY-E) Auto: 67°F-83°F (63°F-83°F for PEFY/PDFY/PFFY-E) * Range of temperature setting varies depending on the model.

Each Group

or Collec-tive

Each Group

Fan Speed Setting

Models with 4 air flow speed settings: Hi/Mid-2/Mid-/Low Models with 3 air flow speed settings: Hi/Mid/Low Models with 2 air flow speed settings: Hi/Low

Each Group

or Collec-tive

Each Group

Air Flow Di-rection Set-ting

Air flow direction angles 100%-80%-60%-40%, Swing, *1. Louver cannot be set. Air flow direction settings vary depending on the model.

*1 Each Group

or Collec-tive

Each Group


Individually prohibit operation of each local remote con-trol function (Start/Stop, Change operation mode, Set temperature, Reset filter).

*2: Centrally Controlled is displayed on the remote controller for prohibited functions.

Each Group

or Collec-tive

*2 Each Group

Indoor Unit Intake Temp

Measures the intake temperature of the indoor unit when the indoor unit is operating.

N/A Each Group

Error When an error is currently occurring on an air conditioner unit, the afflicted unit and the error code are displayed *3 When an error occurs, the LED flashes. The opera-tion monitor screen shows the abnormal unit by flashing it. The error monitor screen shows the abnormal unit address, error code and source of detection. The error log monitor screen shows the time and date, the abnor-mal unit address, error code and source of detection

N/A *3 Each Unit

or Collec-tive


This interlocked system settings can be performed by the master system controller. When setting the interlocked system, use the ventilation switch the free plan LOSSNAY settings between “Hi”, “Low” and “Stop”. When setting a group of only free plan LOSSNAY units, you can switch between “Normal ventilation”, “Inter-change ventilation” and “Automatic ventilation”.

Each Group

Each Group


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EB-50GU-A (Centralized Controller) Item Description Operation Display External Input / Output

By using accessory cables you can set and monitor the following. Input By level: “Batch start/stop”, “Batch emergency stop” By pulse: “batch start/stop”, “Enable/disable remote con-troller” Output: “start/stop”, “error/Normal” Requires the external I/O cables (PAC-YG10HA-E) :4٭sold separately.

*4 Collec-tive

*4 Collec-tive

*GB-50A needs a PC (field supplied) connected together to monitor and operate the air conditioner sys-tem.

b. Standard software functions shall allow the building manager to securely log into each EB-50GU-A via the PC’s web browser to support operation monitoring, scheduling, error email, and online maintenance diagnostics. Standard software functions shall not expire. Additional optional software functions shall be available of personal browser for PCs and MACs, Tenant Billing that requires TG-2000 Integrated System software in conjunction with EB-50GU-A Centralized Controllers. BACnet® interface shall be available through software operating on a dedicated PC and a EB-50GU-A license. Optional software functions shall require advance purchasing and can only be activated upon receipt of a license number from Mitsubishi Electric HVAC.

T. Power Supply (PAC-SC50KUA):

1. The power supply shall supply 12VDC (TB 3) for the G-50 centralized controller and 24VDC (TB 2) voltage for the central control transmission.

U. Power Supply (PAC-SC51KUA):

1. The power supply shall supply 24VDC (TB 3) for the AG-150 centralized controller and 24VDC (TB 2) voltage for the central control transmission.

2.09 FANS

A. All fans shall be Air Moving and Control Association Inc. (AMCA) labeled.

B. Provide self-aligning, enclosed ball bearings, accessible for lubrication unless specified otherwise.

C. Provide variable speed drive for all direct drive fans.

D. Roof Mounted:

1. Direct or V-belt Drive. Provide one-piece heavy-duty ventilator housings, one piece heavy gauge spun aluminum construction, with weatherproof assembly and integral weather shield. Mount ventilators on curbs furnished by the fan manufacturer. Install with fan assembly level.

2. Fan wheels shall be centrifugal design, statically and dynamically balanced. Tip speed, rpm and motor horsepower shall not exceed listing in manufacturer's catalog for unit specified. Power roof ventilators and prefabricated curbs shall be the product of the same manufacturer.


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3. Fans shall have integral factory formed base and one piece spinning without welding. Housings shall be provided with wiring channel and are to be of the direct discharge design. Motor and fan assembly shall be on vibration isolating mounts. Fans shall have capacity, speeds and motor sizes as shown.

4. Provide the following accessories:

Gravity backdraft dampers

Aluminum bird screen with a minimum of 85 percent free area

Adjustable motor pulley

E. In-Line Propeller Fans:

1. Heavy-duty propeller type with belt or direct drive as specified. Blades shall be individually mounted to wheel.

2. Provide sloped roof or flat roof type roof cap, or wall cap to suit the location indicated on the Drawings.

F. In-Line Centrifugal Fans:

1. Centrifugal fan with airfoil blades, aluminum or steel housing, externally mounted belt-drive motor, external lube tubes, integral support brackets.

2. Provide manufacturer’s pitched or flat roof type roof curb to suit the location indicated on the Drawings.

G. Ceiling Mounted Fans:

1. Acoustic lined cabinet, built-in back draft damper, vibration isolated fan and motor, variable speed switch.

2. Provide sloped roof or flat roof type roof cap, or wall cap to suit the location indicated on the Drawings.

2.10 FAN DRIVES

A. Drive Design: The design horsepower rating of each drive shall be at least 1.5 times, single belt drives 2 times, the nameplate rating of the motor with proper allowances for sheave diameters, speed ratio, arcs of contact and belt length.

1. Provide variable speed drives, Dayco, Browning, Woods, or equal. Allow for replacement of fan and motor drives and belts as required to suit the balance requirements of the project.

2. Provide a minimum of two belts for all drives with motors 5 horsepower motors and larger.

3. Belts shall be within 1 degree 30 minutes of true alignment in all cases.

4. Select variable speed drives to allow an increase or decrease of minimum of ten percent of design fan speed.


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5. Motors of 25 HP and less shall have adjustable pitch sheaves; sheaves on motors above 25 HP may be non-adjustable. Change, at no extra cost to Owner, the non-adjustable sheaves to obtain desired air quantities.

B. Sheaves: Sheaves shall be cast or fabricated, bored to size or bushed with fully split tapered bushings to fit properly on the shafts. All sheaves shall be secured with keys and set screws.

C. Belts: All belts shall be furnished in matched sets.

2.11 RELIEF AND INTAKE VENTS

A. Galvanized steel housing with 1/2 inch mesh screen, motorized damper and matching prefabricated curb. On intake vents provide with filter intake. Provide pitched roof curb for relief vents, and install with damper level.

B. Provide prime coat of paint for all roof-mounted air intakes and relief vents. Paint final coat as directed by Architect.

2.12 FILTERS

A. Rooftop AC Units: Provide Farr 30/30, Echo Air E-35, or equal, disposable pleated media type, 25-30 percent efficiency per ASHRAE test standard.

B. Classroom Heat Pump Units: Provide 2” Merv 13 filters on single heat pumps, and 4” Merv filters on twinned units, as scheduled on drawings.

C. Air filters shall be a State Fire Marshal approved and listed type. Preformed filters having combustible framing shall be tested as a complete assembly.

1. Air filters in all occupancies shall be Class 2 or better, as defined in the test method above.

2. Air filters shall be accessible for cleaning or replacement.

3. Air filters shall be SFM listed.

D. Temporary Filters:

1. Install new temporary filters in all units that have filter systems installed. Temporary filters shall match the permanent filters that are specified for the units. Replace filters as needed, in accordance with manufacturer’s directions, in order to provide protection for the unit prior to occupancy by the Owner.

2. If air handling units are operated during construction of the project, install temporary filters directly over each return air inlet. Filters shall match the permanent filters that are specified for the units. Select size of filter to completely cover the frame of the return air inlet, and tape filters firmly in place to eliminate any construction debris from entering the duct system or unit. Remove the temporary filters upon completion of the work, and repair all damaged paintwork.

E. Spare Filters:

1. Furnish two new, complete sets of filter cartridges for each filter bank on completion and acceptance of the work. Install one set of filters in units (prior to


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final air balance) and leave the remaining filters in location designated by the Owner.

2.13 DAMPERS

A. Backdraft Dampers: Ruskin CBD2, counterbalanced, Nailer Industries, or equal.

B. Manual Air and Balance Dampers: Provide dampers of single blade type or multi-blade type constructed in accordance with SMACNA, "HVAC Duct Construction Standards," 1995 edition, except as noted herein.

1. Rectangular Ductwork:

a. Single damper blades may be used in ducts up to 10 inches in height. Dampers shall be 16 gauge minimum. Provide self-locking regulators, equal to Ventlok 641. Provide end bearings equal to Ventlok 607 at each damper. Provide continuous solid 3/8 inch square shafts.

b. Multiple blade dampers shall be equal to Ruskin CD35 Standard Control Damper. Maximum width for multiple damper blades for use in rectangular duct shall not exceed 6 inches.

c. Where duct velocity may be expected to exceed 1500 fpm, provide Ruskin CD-50, or equal, low leakage dampers with airfoil blades.

2. Round Ductwork:

a. Single damper blades may be used in ducts up to 12 inches in diameter. Provide multiple blade opposed blade dampers, with connected linkage, for ductwork larger than 12 inches in diameter.

b. Damper blades for round ductwork shall be 20 gauge steel for ducts up to 12 inches diameter and 16 gauge steel for dampers larger than 12 inches damper. Provide self-locking regulators, equal to Ventlok 641, Durodyne, or equal for operation of dampers. Provide end bearings equal to Ventlok 607 and provide continuous solid 3/8 inch square shafts.

3. Where ductwork is externally insulated, provide self-locking regulators equal to Ventlok 644, Durodyne, or equal for rectangular ductwork, and Ventlok 637, Durodyne, or equal for round ducts.

2.14 LOUVERS

A. Louvers shall be minimum 16 gauge steel with Bonderite and Epon gray primer and 1/2 inch square mesh, 16 gauge galvanized steel screen on the inside. Louvers shall be Airolite #666, Arrow United Industries, or equal, with 4 inch louver depth and optional perimeter flange. Coordinate with Spec Section 10200.

2.15 TEMPERATURE CONTROL SYSTEM

A. All conduit and wiring associated with the temperature control system, regardless of voltage, is included as part of this Section. Contractor shall obtain power for temperature control devices from the nearest available adequate source. Furnish all interlocks, power


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supplies, relays, and the like required to render the control system complete and functional for the intended use.

B. See Control Drawings for Diagrams and Sequences of Operation, control components and model numbers.

C. Mount control thermostat at 48” above finished floor and install “Totaline” series P594 plastic locking thermostat cover. Thermostat wiring shall be installed in “Wiremold”.

D. See “Classroom Heat Pump Enclosure” section for specific control requirements for split furnace systems.

E. Existing pneumatically controlled thermostats removed from the wall shall have the pneumatic tubing capped at thermostat location and the remaining tubing shall be pressure tested.

2.16 DUCTWORK

A. Construct and install all sheet metal ductwork in accordance with the 2013 California Mechanical Code for 2 inches static pressure for supply air, outside air, return air, and exhaust air unless otherwise noted on Drawings.

1. Where not in conflict with the California Mechanical Code, construct and install all sheet metal ductwork in accordance with SMACNA HVAC Duct Construction Standards (Metal and Flexible). Where applicable for HVAC work, construct and install sheet metal work in accordance with SMACNA Architectural Sheet Metal Manual.

2. Provide variations in duct size, and additional duct fittings as required to clear obstructions and maintain clearances as approved by the Architect at no extra cost to the Owner.

3. Gauges, joints and bracing shall be in accordance with the 2010 California Mechanical Code.

4. Provide beading or cross breaking for all ductwork.

5. At the contractor's option, ductwork may be fabricated using the Ductmate, Nexus, Quickduct, Transverse Duct Connection (TDC), Pyramid-Loc duct connection systems, or equal. Fabricate in strict conformance with manufacturer's written installation instructions and in accordance with California Mechanical Code.

a. Seal flanged ends with pressure sensitive high density, closed cell neoprene or polyethylene tape gasket, Thermo 440, or equal.

b. Provide metal clips for supporting duct connections, except at breakaway connections for fire dampers and fire smoke dampers. Provide corner clips at each corner of duct, through bolted, at all locations except at breakaway connections for fire dampers and fire smoke dampers. Where used on locations exposed to weather, provide continuous metal clip at top of duct, with 1 inch overhang for each side.


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B. Design and installation standards:

1. SMACNA Compliance: Comply with applicable portions of Sheet Metal and Air Conditioning Contractor's National Association (SMACNA) for all work in this section.

2. ASHRAE Standards: Comply with American Society of Heating, Refrigerating and Air Conditioning Engineers, Inc. (ASHRAE) recommendations, 1985 edition, for all work in this section.

3. NFPA Compliance: Comply with ANSI/NFPA 90A, "Standard for the Installation of Air Conditioning and Ventilating Systems," and ANSI/NFPA 90B, "Standard for the Installation of Warm Air Heating and Air Conditioning Systems."

4. California Mechanical Code 2013 edition.

5. ADC Test Code FD 72-Rl, Flexible Air Duct Test Code.

6. NFPA 90-A, Standard for the Installation of Air Conditioning and Ventilating Systems, latest edition.

C. Fabricate all ductwork with sheet metal. Fiberglass ductwork will not be accepted for use on this project.

D. Duct sizes indicated are external sizes.

E. Galvanized Sheet Steel: Lock-forming quality, ASTM A924 and ASTM A653, Coating Designation G 90. Provide mill phosphatized finish for exposed surfaces of ducts exposed to view.

1. Provide mill certification for galvanized material at request of the IOR.

F. Seal airtight all joints and seams, including standing seams and manufactured joints and seams, of all supply, return and exhaust ducts except those exposed in the conditioned space. Provide one part, non-sag, solvent release and curing polymerized butyl sealant, formulated with a minimum of 75 percent solids.

1. Available Manufacturers: Subject to compliance with requirements, manufacturers offering duct sealant which may be incorporated in the work include the following, or equal:

Design Polymetrics Model DB1010

Polymer Adhesive Sealant Systems Inc – Airseal #11

United Sheet Metal

G. Seal airtight and watertight all joints and seams of all ductwork exposed to the weather with 6 ounce canvas bonded with MEI Eco-Tack adhesive; cover the canvas with a heavy coat of Foster's 56-10, United McGill, or equal, no dilution.

1. Pressure-sensitive tapes or single part sealant not acceptable.


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2. Where seams are exposed to weather, paint seams with aluminum paint. Provide cross broken ductwork, and insure that the ductwork will shed water. Beading of duct work will not be considered.

H. Provide sheet metal angle frame at all duct penetrations to wall, floor, roof, or ceiling.

I. Internal Duct Lining:

1. Provide internal duct lining where indicated on the Drawings, with a minimum of 10'-0" length in each direction from the fan, fan casing, or unit casing. Line all transfer ducts.

a. Where ductwork is exposed to weather or is outside the building insulation envelope, provide 2 inch thick, 1-1/2 pound density internal lining with matte facing, with an R-Value of 8.0 minimum.

b. Where ductwork is not exposed to weather or is within the building insulation envelope, lining shall be 1” thick, 1-1/2 pound density, with R-value of 4.2 minimum.

c. Ducts exposed in conditioned space shall not be insulated except where internal duct liner is indicated, duct liner shall be 1” thick for this condition.

d. Ducts exposed in the conditioned space shall be free of dents and blemishes and be mounted tight against adjacent surface with flat hangers.

e. Cement duct liner in place with nonflammable, non-hardening duct adhesive. Seal all raw edges of insulation inside ductwork with adhesive, including longitudinal liner edges.

f. Provide metal nosing at all locations where liner is preceded by unlined metal.

g. Provide sheet metal weld pins and washers or clinch pins and washers on all ductwork on 12 inch intervals with the first row within 3 inches of the leading edge of each piece of insulation and within 4 inches of corners. No use of adhesive mounted pins will be considered.

1) Install clinched pin fasteners with properly adjusted automatic fastening equipment. Manual installation will not be considered.

2) Install weld pins with properly adjusted automatic fastening equipment. Installation shall not damage the galvanized coating on the outside of the duct.

h. All ductwork, adhesives, lining, sealant, flex duct and the like shall have a flame spread of 25 or less and developed smoke rating of 50 or less when tested in accordance with one of the following test methods: NFPA 255, ASTM E84, or UL 723.


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i. Manufacturer: Subject to compliance with requirements, manufacturers offering duct liners and adhesives include the following, or equal.

Manufacturer: Product:

Owens-Corning Fiberglas Corp. Aeroflex Plus

Johns Manville Linacoustic

CertainTeed Corporation ToughGard

Fosters Adhesive 85-462

Swifts Adhesive 7336

J. Ductwork Support Materials: Except as otherwise indicated, provide hot-dipped galvanized steel fasteners, anchors, rods, straps, trim, and angles for support of ductwork.

K. Rectangular Duct Fabrication:

1. Shop fabricate ductwork of gauges and reinforcement complying with the more stringent of the following standards, except as noted herein.

a. SMACNA HVAC Duct Construction Standards, Latest Edition

b. California Mechanical Code, 2013

2. Fabricate ducts with minimum duct gauges as follows:

Duct Dimension Minimum Gauge Joint Reinforcement Per CMC

up through 12" 26 Not Required

13" through 18" 24 Not Required

19" through 30" 24 C/4

31" through 42" 22 E/4

43" through 54" 22 F/2

3. Fabricate duct fittings to match adjoining ducts and to comply with duct requirements as applicable to fittings. Except as otherwise indicated, fabricate elbows with center-line radius equal to 1.5 times associated duct width. Fabricate to include single thickness turning vane in elbows where space does not permit the above radius or where square elbows are shown. Limit angular tapers to 30 degrees for contracting tapers and 20 degrees for expanding tapers. Turning vanes shall be E-Z Rail II, Durodyne, or equal

4. Fabricate round supply connections at rectangular, plenum type fittings using spin-in type fittings, complete with extractor and volume control damper. Refer to Paragraph “DAMPERS” for damper requirements.


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5. Provide drive slip or equivalent flat seams for ducts exposed in the conditioned space or where necessary due to space limitations. On ducts with flat seams, provide standard reinforcing on inside of duct. Duct connection to outlet on exposed duct shall be full size of outer perimeter of outlet flange.

6. Provide 20 gauge minimum for ductwork exposed within occupied spaces.

L. Round Ductwork Fabrication:

1. Spiral lock seam prefabricated factory-build round and oval duct and fittings shall be used wherever possible. Shop fabricated ducts shall be used only where rectangular shaped ducts are shown on plans or where transitions and special fittings cannot be prefabricated by factory. Provide couplings to join each length of duct.

2. Fabricate duct fittings to match adjoining ducts and to comply with duct requirements as applicable to fittings. Except as otherwise indicated, fabricate elbows with center-line radius equal to 1.5 times associated duct width. Provide two-piece, die-stamped, 45-degree to 90-degree elbows for sizes up to 12 inches; five-piece, 90-degree elbows for sizes 12 inches and above; conical tees; and conical laterals. All reducers shall be placed after a tap has been made on the duct main. Reducers shall be long-taper style.

3. Round Ductwork: Construct of galvanized sheet steel complying with ANSI/ASTM A 527 by the following methods and in minimum gauges listed.

Diameter Minimum Gauge Method of Manufacturer

Up to 14" 26 Spiral Lockseam

15" to 23" 24 Spiral Lockseam




Over 60" 14 Longitudinal Seam

4. Provide locked seams for spiral duct; fusion welded butt seam for longitudinal seam duct.

5. Fittings and Couplings: Construct of minimum gauges listed. Provide continuous welds along seams.

Diameter Minimum Gauge

3" to 36" 20

38" to 50" 18

Over 50" 16


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6. Provide 20 gauge minimum for ductwork exposed within occupied spaces.

M. Round Internally Insulated Duct and Fittings: Where ductwork is exposed to weather or outside the building insulation envelope, construct with outer pressure shell, 2 inch thick (Minimum R-value = R-8) insulation layer, and perforated inner liner. Where ductwork is within the building insulation envelope, construct with outer pressure shell, 1 inch thick (minimum R-value = R4.2) insulation layer, and perforated inner liner. Construct shell and liner of galvanized sheet steel complying with ANSI/ASTM A 653, of spiral lockseam construction (use longitudinal seam for over 59 inches), in minimum gauges listed in table below. Where installed exposed in the conditioned space: duct and fitting outer pressure shell shall be minimum 20 gauge with 1 inch insulation layer (minimum R-value = R-4.2).

Nominal Duct Diameter Outer Shell Inner Liner

3" TO 12" 26 gauge 24 gauge

13" TO 24" 24 gauge 24 gauge

25" to 34" 22 gauge 24 gauge



Over 59" 16 gauge 20 gauge

1. Fittings and Couplings: Construct of minimum gauges listed. Provide continuous weld along seams of outer shell.

Nominal Duct Diameter Outer Shell Inner Liner



Over 48" 16 gauge 20 gauge

2. Inner Liner: Perforate with 3/32 inch holes for 22 percent open area. Provide metal spacers welded in position to maintain spacing and concentricity.

3. Available Manufacturers: Subject to compliance with requirements, manufacturers offering factory fabricated ductwork which may be incorporated in the work include the following, or equal:

Sheet Metal Div., United McGill Corp. Uniseal

Semco Manufacturing Incorporated

Air Systems Incorporated - Las Vegas

N. Miscellaneous Ductwork Materials:

1. Duct Access: Provide hinged access door in rectangular ducts for access to fire dampers, control equipment, etc. Access door size shall be duct diameter wide


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by duct diameter high for all ducts under 24 inches. Ducts over 24 inches in diameter shall have 24-inch by 18-inch access doors. Minimum size access doors shall be 6 inches by 6 inches.

2. Provide hinged style access doors for round ductwork, National Controlled Air, Inc. Dallas Texas, Model AD-RD-87, Pottorff Series 60, or equal. Access doors shall be 16 gauge galvanized steel with continuous piano hinge. Locks shall be plated steel strike and catch. Provide 1" x 3/8" Polyethylene "Perma Stik" gasket all around door.

2.17 AIR INLETS AND OUTLETS

A. Except as otherwise indicated, provide manufacturer's standard outlets and inlets where shown; of size, shape, capacity and type indicated; constructed of materials and components as indicated, and as required for complete installation.

B. Performance: Provide outlets and inlets that have, as minimum, temperature and velocity traverses, throw and drop, and noise criteria ratings for each size device as listed in manufacturer's current data.

C. Ceiling, wall or floor Compatibility: Provide outlets with border styles that are compatible with adjacent ceiling, wall or floor systems, and that are specifically manufactured to fit into ceiling, wall or floor module with accurate fit and adequate support. Refer to general construction drawings and specifications for types of ceiling systems that will contain each type of air outlet and inlet.

D. Refer to Schedule on Mechanical Drawings for details of inlets and outlets to be used.

PART 3 - EXECUTION

3.01 EQUIPMENT START-UP

A. It shall be the responsibility of the Contractor to assemble and supervise a start-up team consisting of Controls, AC Equipment Start-Up Technician, Manufacturer Representative, and Test and Balance Contractor; all to work in concert to assure that the systems are started, balanced and operate in accordance with the design.

B. After start-up is complete, instruct the Owner's personnel in the operation and maintenance of the systems. Obtain from the Owner's representative a signed memo certifying that instruction has been received.

C. See “Mitsubishi City Multi VRF System Start-Up, Testing, Programming, Training and Maintenance Requirements” for information on these systems.

3.02 MITSUBISHI CITY MULTI VRF SYSTEM START-UP, TESTING, PROGRAMMING, TRAINING, AND MAINTENANCE REQUIREMENTS

A. Regarding the Owner furnished – Contractor installed Mitsubishi City Multi VRF systems of this project, it shall be noted that the supplier of this equipment to the District (“Equipment Supplier”) has the following responsibilities, and that the Contractor shall work closely with Equipment Supplier to coordinate these activities to the successful outcome of the project:

1. Equipment Supplier shall attend weekly construction meetings to provide updates and schedule as required. In addition, provide installation supervision to ensure


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manufacturers requirements are complied with. All work shall be performed to standard work practices, specifications, local code and equipment manufacturer’s requirements.

2. Upon completion of installation, Equipment Supplier shall conduct pressure test utilizing dry nitrogen. System shall be pressurized to 500-600 PSIG. System shall pass a standing test of 24 hours. Installing Mechanical Contractor shall make corrections in the event of failure.

3. Equipment Supplier shall evacuate entire system to a level of 500 Microns and allow system to pass a standing vacuum test of 1 hour.

4. Equipment Supplier shall charge system to manufacturer’s specification with Equipment Supplier’s supplied refrigerant.

5. Equipment Supplier shall address system network/Mnet DDC components as required per each specific application.

6. Equipment Supplier shall program Mitsubishi GB-50A Controller as required for specific application.

7. Equipment Supplier shall program system thermostats with parameters provided specific to job requirements.

8. Equipment Supplier shall perform system start-up per the manufacturer’s guidelines.

9. Equipment Supplier shall perform system test to confirm proper operation.

10. Equipment Supplier shall provide documentation of all of the above including start-up reports, tests, and settings for each system.

11. Equipment Supplier shall provide on-site owners training with MDUSD personnel for a minimum of 32 hours.

12. Equipment Supplier shall provide first year service response, including service calls after systems are confirmed to have power and operational settings at controller/thermostat in the conditioned space. Service calls are to be made to a central dispatcher through MDUSD’s authorized Mitsubishi Service Representative with a maximum 2 Hour response time.

13. Equipment Supplier shall provide Mitsubishi factory City Multi Certification Class for (8) technicians, (2) techs per installing mech. Contractor, and (2) MDUSD representatives. Include all travel expenses, class tuition, hotel, auto rental and meal allowance.

3.03 REFRIGERANT PIPING INSTALLATION

A. General:

1. Install refrigerant piping according to ASHRAE 15.

2. Install piping straight and free of kinks, restrictions or traps.


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3. Install piping as short and direct as possible, with a minimum number of joints, elbows, and fittings.

4. Slope refrigerant piping in accordance with equipment manufacturer’s requirements.

5. Install fittings for changes in direction and branch connections.

6. Piping under raised floors shall be kept 6 inches minimum above ground; excavate as necessary.

B. Factory Pre-charged and sealed line set piping:

1. Keep the entire system clean and dry during installation.

2. All tubing shall be evacuated and sealed at the factory. The seal must not be broken until ready for assembly.

3. If there is any evidence of dust, moisture, or corrosion, the tubing must be cleaned out by drawing a swab soaked with methyl alcohol through the tubing as many times as necessary to thoroughly clean the tubing.

4. Where line set piping is used, enclose in iron or steel piping and fittings or in EMT conduit.

C. Field Assembled Refrigerant Piping:

1. Select system components with pressure rating equal to or greater than system operating pressure.

2. Where subject to mechanical injury, enclose refrigerant piping in EMT conduit.

3. When brazing, remove solenoid valve coils and sight glasses, also remove valve stems, seats, and packing, and accessible internal parts of refrigerant specialties. Do not Apply heat near expansion-valve bulb.

3.04 ANTI-VIBRATION BASES AND HANGERS

A. Isolate all ventilating and air conditioning equipment connections including conduit, piping, drains, etc., so that equipment will operate under continuous demand without objectionable vibration.

B. Support all air conditioning units, all fans, and all pumps of 5 HP and over on anti-vibration bases or hangers. Other equipment shall be supported on anti-vibration bases, pads, or hangers, as shown on the drawings or specified with the equipment. Individual fans shall have integral fan and motor bases, spring-type unless noted. High velocity fans - unguided stable springs with 2" deflection.

C. Selection of the bases or supporting units shall be in accordance with the vibration eliminator manufacturer's recommendations. Minimum static deflection shall be 1-1/2 inches or as marked on the drawings.

D. The equipment manufacturer shall furnish the weight of equipment at each point of support.

3.05 FILTERS


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A. Mount filters in airtight frames furnished by the filter manufacturer, and install in accordance with manufacturer's recommendations.

B. Identify each filter access door with 1/2 inch high minimum stenciled letters.

C. Provide temporary filters for all fans that are operated during construction; after all construction dirt has been removed from the building install new filters at no additional cost to the Owner. In addition to temporary filters at filter location, provide temporary filters on all duct openings which will operate under a negative pressure.

1. Filters used for temporary operation shall be the same as permanent filters for the application. Filters used for duct openings may be 1 inch thick pleated media disposable type.

3.06 INSTALLATION OF DUCTWORK

A. Assemble and install ductwork in accordance with recognized industry practices which will achieve air tight and noiseless (no objectionable noise) systems capable of performing each indicated service. Install each run with minimum of joints. Align ductwork accurately at connections within 1/8 inch misalignment tolerance and with internal surfaces smooth. Support ducts rigidly with suitable ties, braces, hangers, and anchors of type which will hold ducts true to shape and to prevent buckling. Where possible, install ductwork to clear construction by 1/4 inch minimum, except at air inlets and outlets. Where ductwork will not clear construction, secure duct firmly to eliminate noise in the system.

B. Applicable Leakage Classes:

Pressure Class Leakage Class

Round Duct Rectangular Duct

2"W.G. or less 12 12

C. Install concrete inserts for support of ductwork in coordination with formwork as required to avoid delays in work.

D. Upper connection of support to wood structure shall be with wood screws or lag screws in shear fastened in the upper one half of the wood structural member. Fasteners shall conform to the following schedule:

For ducts with P/2=30" #10 x 1-1/2" wood screw

For ducts with P/2=72" ¼"x 1-1/2" lag screw

For ducts with P/2 over 73" 3/8"x 1-1/2" lag screw

E. Upper connection in tension to wood shall not be used unless absolutely necessary. Where deemed necessary the contractor shall submit calculations to show the size fastener and penetration required to support loads in tension from wood in accordance with the following schedule:

For ducts with P/2=30" 260 pounds per hanger



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For duct with P/2 larger than 120" NOT ALLOWED

F. Where ducts pass through interior partitions and exterior walls, conceal space between construction opening and duct or duct plus insulation with sheet metal flanges of same gauge as duct. Overlap opening on four sides by at least 1-1/2 inches.

G. Support ductwork in manner complying with SMACNA "HVAC Duct Construction Standards," hangers and supports sections. Where special hanging of ductwork is detailed or shown on Drawings, Drawings shall be followed. Angles shall be attached to overhead construction in a manner so as to allow a minimum of 2 inches of movement in all directions with no bending or sagging of the angle.

1. Except where modified in individual paragraphs of this Section, provide hanger support with minimum 18 gauge straps, 1 inch wide. Fold duct strap over at bottom of duct.

2. Install duct supports to rectangular ducts with sheet metal screws. Provide one screw at top of duct and one screw into strap at bottom of duct.

H. Paint inside of ducts, visible through grille, dull black.

I. Where ductwork is installed in finished areas of buildings that do not have ceilings, paint ductwork, support hangers, and air inlets and outlets to match adjacent architectural surfaces, or as directed by Architect.

3.07 CLEANING AND PROTECTION

A. Clean ductwork internally, unit by unit as it is installed, of dust and debris. Clean external surfaces of foreign substances that might cause corrosive deterioration of metal or where ductwork is to be painted.

B. Strip protective paper from stainless ductwork surfaces, and repair finish wherever it has been damaged.

C. Temporary Closure: At ends of ducts that are not connected to equipment or air distribution devices at time of ductwork installation, provide temporary closure of polyethylene film or other covering that will prevent entrance of dust and debris until connections are to be completed.

D. At completion of work, check internal lining for small cuts, tears, or abrasions. Repair all damage with fire retardant adhesive.

3.08 DAMPERS

A. All dampers automatically controlled by damper motors are specified under "Temperature Control System" except those specified with items of equipment.

B. Provide opposed blade manual air dampers at each branch duct connection and at locations indicated on the drawings and where necessary to control air flow for balancing system. Provide an opposed blade balancing damper in each zone supply duct. Provide an access panel or Ventlok flush type damper regulator on ceiling or wall for each concealed damper.


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C. Install fusible link fire dampers full size of duct at points where shown or required.

D. Provide 18 inch x 12 inch minimum hinged access doors in ductwork and furring for easy access to each fire damper; insulated access doors in insulated ducts. Label access doors with 1/2 inch high red letters.

1. Provide Ventlok Series 100, Durodyne, or equal access doors with hardware for convenient access to all automatic dampers and other components of the system, insulated type in insulated ducts. Provide Ventlok #202 for light duty up to 2 inch thick doors, #260 heavy-duty up to 2 inch thick doors and #310 heavy-duty for greater than 2 inch thick doors. Provide #260 hinges on all hinged and personnel access doors; include gasketing.

3.09 AIR INLETS AND OUTLETS

A. Provide all air inlets and outlets with gaskets and install so that there will be no streaking of the walls or ceilings due to leakage. Duct connection to outlet on exposed duct shall be full size of outer perimeter of outlet flange.

B. Unless otherwise indicated on Drawings, provide rectangular plenum on top of each diffuser and ceiling return for connection to ductwork. Line plenum with internal insulation as indicated for lined ductwork. Size plenum to allow full opening into air terminal.

C. Ceiling-mounted air terminals or services installed in T-Bar type ceiling systems shall be positively attached to the ceiling suspension main runners or to cross runners with the same carrying capacity as the main runners.

1. Terminals or services weighing not more than 56 pounds shall have two No. 12 gauge hangers connected from the terminal or service to the structure above. These wires may be slack.

2. Support terminals or services weighing more than 56 pounds directly from the structure above by approved hangers. Provide 4 taut 12 gauge wires each, attached to the fixture and to the structure above. The 4 taut 12 gauge wires, including their attachment to the structure above must be capable of supporting 4 times the weight of the unit.

3. Secure air inlets and outlets to main runners of ceiling suspension system with 2 sheet metal screws.

D. Furnish all air inlets and outlets with a baked prime coat unless otherwise noted. Provide off-white baked enamel finish on ceiling-mounted air inlets and outlets. Paint exposed mounting screws to match the material being secured.

E. Air inlets and outlets shall match all qualities of these specified including appearance, throw, noise level, adjustability, etc.

3.10 CLASSROOM HEAT PUMP ENCLOSURE INSTALLATION

A. To level enclosure on uneven floor surface, position shim(s) with “V” slot on anchor bolts at corners of enclosure. Stack shims as required to bring enclosure level and plumb. Ensure that shims are directly under anchor bolt heads and torque anchor bolt to 40 ft./lbs.


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3.11 FANS

A. Each ceiling-mounted fan shall have multi-speed switch and integral backdraft damper.

B. Provide access doors for fans or motors mounted in ductwork.

C. Mount all fans so that they are completely isolated from building.

D. Fan motors mounted in air-stream to be totally enclosed.

E. Completely line supply, return or exhaust fan cabinets with 1 inch thick, 3/4 pound. density acoustic insulation securely cemented in place.

F. Roof fans shall be mounted level.

3.12 RELIEF VENTS

A. Install relief vents to provide a level mounting for backdraft damper or motorized damper.

3.13 TEMPERATURE CONTROL SYSTEM

A. Provide thermostats where indicated on drawings. All wiring shall be in conduit. Provide all relays, transformers and the like to render the control system complete and fully operable. All control conduit to be rigid steel type. Surface mounted Thermostat wiring may be encased in wiremold. Thermostat wiring shall be in Wiremold Series V700 surface mounted steel raceway with accessory fittings and boxes. Where existing conduit is available, contractor may run new thermostat wiring in such conduit after review and approval by the contracting officer, and with a suitable credit to the contract

3.14 EQUIPMENT MOUNTING

A. Mount and anchor equipment in strict compliance with drawings details. Alternate anchorage methods will not be considered for roof mounted equipment.

3.15 DUCTWORK SEALING AND LEAK TESTING

A. New Construction: All duct systems (supply return, outside air intake, and exhaust), except those exposed in the conditioned space, shall be sealed and leak tested to a leakage rate not to exceed 6 % of the fan flow of the system. The leakage rate shall be confirmed through field verification and diagnostic testing in accordance with the procedures set forth in the 2008 California Building Energy Efficiency Standards Non-Residential ACM Manual. Contractor shall also complete the Acceptance Requirements in the standards for duct sealing/leak testing. Refer to section 15050 for further information on Acceptance Requirements.

B. Retrofit Construction, including alterations to existing duct system or space conditioning equipment: All duct systems (supply, return, outside air intake and exhaust), except those exposed in the conditioned space, shall be sealed and leak tested in strict conformance with the requirements of section 149 of the 2008 California Building Energy Efficiency Standards. See drawings for extent of this work and leakage rate requirements. The leakage rate shall be confirmed through field verification and diagnostic testing in accordance with the procedures set forth in the 2008 California Building Energy Efficiency Standards Non-Residential ACM Manual. Contractor shall also complete the Acceptance Requirements in the standards for duct sealing/leak testing. Refer to Section 15050 for further information on Acceptance Requirements.


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3.16 TESTING AND BALANCING

A. Obtain the service of an independent test and balance agency that specializes in, and whose business is limited to, testing and balancing of air conditioning systems. Balance agency shall be a member of Associated Air Balance Council (AABC). Coordinate testing and balancing agency work with work of other trades.

B. Testing and balancing agency, as a part of its contract, shall act as authorized inspection agency and shall report any discrepancies or items not installed in accordance with Contract Drawings and/or Specifications pertaining to air and water distribution.

1. Balance report shall be signed by the Contractor, attesting that all reported deficiencies have been corrected. Balance reports containing uncorrected deficiencies will be rejected.

C. Provide for adjustments and/or additions or modifications to fan and motor sheaves, belts, damper linkages and the like to achieve proper air balance at no additional cost.

D. Perform testing and balancing in complete accordance with AABC National Standards. Perform testing on the following:

1. Air distribution system

2. Existing heating hot water system

E. Instruments used for testing and balancing of systems shall have been calibrated within a period of six (6) months and shall be checked for accuracy prior to start of work.

F. Submit three (3) copies of complete test report prior to final acceptance of project.

G. Tabulate magnetic starters size, type, and manufacturer with heater strip size, type and rating along with motor nameplate data.

H. Measure the ampere reading of each motor input after final adjustments have been made.

I. Air Distribution System Balancing:

1. Balance air quantities of supply, return, outside air, and exhaust to achieve those given on Drawings with accuracy within minus 5 percent and plus 10 percent. Measure the total air quantity at each fan. Measure the total air quantity at each supply fan with maximum outside air and with minimum outside air. Measure the ampere reading of each motor input after final adjustments have been made. Upon satisfactory completion of balance and operational test, submit three sets of reports to the Architect on balance final readings, summary of fan CFM delivery rates, static pressure ratings, motor ampere input, and general summary of test results. Specified ratings and motor nameplate ratings shall be listed with measured readings.

a. Check and report operation of relief air dampers. Insure that dampers remain full open during economizer cycle, and full closed at all other times. Measure and report total relief from power economizer operation during each phase of economizer cycle.


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b. Test each system for building operating pressure, under all operating conditions, including all phases of the economy cycle. Maximum building pressure shall not exceed 0.03 inches of pressure.

2. Balance air quantities of supply to achieve those given on drawings. Keep records on all air quantities measured, including tests prior to final balance. Use branch duct volume control dampers for balancing. Use of terminal dampers is not acceptable.

3. Air balance shall be achieved using variable fan speeds.

4. Adjust single or double deflection registers and variable pattern diffusers to evenly distribute air within the conditioned space. The terminal air velocity at 5 feet above the floor shall not exceed 50 FPM in normal air conditioned spaces.

5. Test economizer cycle for each air system.

a. Adjust control systems to provide correct operation.

b. Adjust relief air dampers as required to provide 100 percent relief in economizer mode, and confirm satisfactory operation of all backdraft dampers.

c. Provide, as part of air balance report, final settings of each economizer control, and total air flow through relief air hood.

J. Hydronic System Balancing:

1. Calibration and testing of hydronic system in conformance with AABC recommendations.

2. Complete air balance prior to hydronic system balancing.

3. Water Balance Procedures: Set hot water pumps to design GPM quantities.

4. Check and adjust water temperature and GPM flow characteristics at all cooling and heating coils.

5. Upon completion of flow ratings and coil adjustments, mark all settings and record all data.

6. Recorded Data Shall Include:

a. Inlet and leaving temperatures at all coils and heating equipment.

b. Pressure drop at each coil including coil bypass.

c. Pump operating suction and discharge pressure and final total dynamic pump head.

d. Rated and actual running amperage of pump motors.

7. Venturies and calibrated orifices with portable or permanent flow meters shall be used to balance the waterflows. When above equipment is not installed, obtain


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waterflow balance by measurement of temperature differential across the various coils or elements.

3.17 ACCEPTANCE REQUIREMENTS

A. In addition to the testing and balancing requirements specified in the previous section, the contractor shall also be responsible to complete all the Acceptance Requirements of the 2008 California Building Energy Efficiency Standards. Refer to Section 15050 for further information on Acceptance Requirements.

3.18 MODULATING POWER EXHAUST START UP

A. Pre Start Up

1. Once the power exhaust economizer is installed, remove the access doors on the exhaust cabinet.

a. Route the 1/8" pressure tubing (provided with the economizer) from the high pressure port on the transmitter to the occupied building space. Terminate the pressure tubing in the conditioned space at a port (field provided) shielded from drafts.

b. Route line voltage cable from the VFD to the disconnect or unit power distribution point as required.

2. Note

a. Check local code requirements prior to installing the line voltage through ac package unit. A separate disconnect may be required. See power exhaust name plate for electrical ratings.

B. Start Up

1. Use the MODULATION POWER EXHAUST START-UP REPORT (included at the end of this section) to record unit information and verification of start up checks.

a. The power exhaust will be energized when the exhaust control contacts are closed. The contacts will not be closed until the outside air dampers start to open. Once the contacts are closed the run signal at the VFD will be enabled. Motor speed will be dependent upon the building pressure signal from the pressure transmitter.

2. Check the power exhaust installation is complete, power exhaust is level and all seams are tight.

3. Check the set screws on the blower wheel hub. Be sure they are tight and the wheel does not rub the housing.

4. Check the motor and blower pulleys. Be sure they are tight and aligned.

5. Check the belt tension. Assure there is not more than 1/2" of belt deflection.

6. Check all line and low voltage connections for loose or un-connected wires.


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a. WARNING: Hazard of Electrical Shock! Capacitors in the VFD retain their charge after the power is removed. Disconnect incoming power and wait until the voltage between terminals b+ & b- is 0 vdc before servicing the drive.

7. Verify correct voltage to the disconnect before turning on power to the power exhaust.

a. To check out the blower, temporarily disconnect the jumper from terminals 13a to 2 on the VFD terminal strip.

b. This will place the VFD in keypad/frequency operation.

c. Use the arrow keys on the keypad to increase the speed to 60 Hz.

d. If the blower is rotating the wrong direction, switch the t1 & t2 motor leads at the VFD to t2 & t1.

e. Adjust the motor sheave for the desired blower CFM output at full speed.

f. When the blower check-out is complete, run the speed back down to 20 Hz and re-connect the jumper between terminals 13a and 2.

8. Adjust the setpoint per job requirements. The VFD will display the pressure control set point in hundredths of an inch w.g. (Example: 3.0 = .03" w.g.)

a. Note: The initial setting at first power up will be 3.0. To adjust the set point, press the up or down arrow, pic will flash in the display then the set point will display with a dot in the upper left corner of the window. Use the up or down arrow to adjust the set point now. After 5 seconds of inactivity the VFD will revert to display mode. Use the following chart for reference.

DISPLAY INCHES WATER GAGE

10.0 0.10”

9.0 0.09”

8.0 0.08”

7.0 0.07”

6.0 0.06”

5.0 0.05”

4.0 0.04”

3.0 0.03”

2.0 0.02”

1.0 0.01”


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0.0 0.00”

b. To see the frequency output: press mode twice, p50 will display, press the up arrow until p71 is displayed, press mode. The display now shows the frequency output. Press mode to return to the set point display.

c. To see the transmitter output: press mode twice, p50 will display, press the up arrow until p69 is displayed, press mode. The display now shows the transmitter output signal level. 0.0=0vdc, 10.0=10vdc. Press mode to return to the set point display.

d. For more advanced features and settings, refer to the VFD manual.

e. Note: to change the OEM settings, parameter p48 must be set to 01 (user settings). The VFD must be in a stopped state with “---“ in the display to change this parameter.

9. Notes:

a. Power supply, provide disconnect means and circuit protection as required. See power exhaust name plate for electrical ratings. If local codes allow connecting to the HVAC unit power make sure the disconnect and incoming wiring are sized to handle the load of both the HVAC unit and the power exhaust.

b. The exhaust contacts (ec) initiate the run/stop signal for the VFD. When the outside air dampers are fully closed the VFD is in stop mode. When the dampers start to open the VFD will go into run mode. The exhaust contacts will be either integral to the economizer controller or actuator or be a separate end switch mounted on the damper frame.

c. The VFD is factory pre-programmed to accept the 0-10 vdc signal from the differential pressure transmitter. For custom programming, first change parameter 48 to user settings. See instructions in the VFD hand book to set parameters.


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MODULATION POWER EXHAUST START-UP REPORT PROJECT ____________________________________________________________ AC UNIT MODEL _________________________ UNIT TAG __________________ POWER EXHAUST MODEL ______________________________________________ POWER EXHAUST SERIAL NUMBER ______________________________________ DATE _______________ TECHNICIAN ___________________________________ ____ POWER EXHAUST CABINET IS INSTALLED IN AC UNIT (SEAMS ARE TIGHT, POWER EXHAUST IS LEVEL, NO GAPS) ____ ELECTRICAL CONNECTIONS ARE TIGHT ____ VERIFY BLOWER ROTATES FREELY AND WHEEL DOES NOT RUB

____ MOTOR SHEAVE, BLOWER SHEAVE AND BLOWER WHEEL SET SCREWS ARE TIGHT.

____ VERIFY PRESSURE TUBING IS RUN TO OCCUPIED SPACE ____ LOW VOLTAGE WIRING IS CONNECTED ____ LINE VOLTAGE WIRING IS CONNECTED ____ VERIFY VOLTAGE ______ L1-L2 ______ L2- L3 ______ L1-L3 ______ L1-N ______ L2-N ______ L3-N ____ VERIFY BLOWER ROTATION ____ BLOWER & VFD DATA AT 60HZ __________ CFM ___________ RPM VFD ______ L1 AMPS ______ L2 AMPS ______ L3 AMPS MOTOR ______ T1 AMPS _____ T2 AMPS ______ T3 AMPS MOTOR ______ BHP ____ VERIFY VFD IS OPERATING IN PI MODE ____ PRESSURE SET POINT FOR OCCUPIED SPACE

SAMPLE BLOWER SET UP LABEL TO BE PLACED ON DRIVE SIDE OF BLOWER

MOTOR SHEAVE: 1VL34X.625 BLOWER SHEAVE: AK41H BLOWER BUSHING: HX.75 BELT: A37 MOTOR SHEAVE ADJUSTMENT 2 TURNS OPEN BLOWER RPM=1167 4 TURNS OPEN BLOWER RPM=987

End of Section