Tinker AFB, OK TAFB Technical Specifications 2019

April 2019 Page 1 Section 23 81 00

SECTION 23 81 00

UNITARY AIR CONDITIONING EQUIPMENT

This guide specification covers the requirements for room air conditioners, packaged terminal units, heat pumps, and air conditioners of the single package or split system type.

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only. Current editions of references at time of delivery order shall be used.

AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI)

AHRI 350 Sound Rating of Non-Ducted Indoor Air-

Conditioning Equipment

AHRI DCAACP (Online) Directory of Certified Applied Air-

Conditioning Products

ANSI/AHRI/CSA 310/380 Standard for Packaged Terminal Air-

Conditioners and Heat Pumps

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING

ENGINEERS (ASHRAE)

ANSI/ASHRAE 15 & 34 ANSI/ASHRAE Standard 15-Safety Standard for

Refrigeration Systems and ANSI/ASHRAE Standard 34-Designation and Safety Classification of Refrigerants

ASHRAE 52.2 Method of Testing General Ventilation Air-

Cleaning Devices for Removal Efficiency by Particle Size

ASHRAE 55 Thermal Environmental Conditions for Human

Occupancy

ASHRAE 62.1 Ventilation for Acceptable Indoor Air Quality

ASHRAE 90.1 - IP Energy Standard for Buildings Except Low-Rise

Residential Buildings

AMERICAN WELDING SOCIETY (AWS)

AWS A5.8/A5.8M Specification for Filler Metals for Brazing and Braze Welding

April 2019 Page 2 Section 23 81 00

ASME INTERNATIONAL (ASME)

ASME B16.22 Standard for Wrought Copper and Copper Alloy

Solder Joint Pressure Fittings

ASME B31.5 Refrigeration Piping and Heat Transfer

Components

ASSOCIATION OF HOME APPLIANCE MANUFACTURERS (AHAM)

AHAM RAC-1 Directory of Certified Room Air Conditioners

ASTM INTERNATIONAL (ASTM)

ASTM A653/A653M Standard Specification for Steel Sheet, Zinc-

Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM B117 Standard Practice for Operating Salt Spray

(Fog) Apparatus

ASTM B280 Standard Specification for Seamless Copper

Tube for Air Conditioning and Refrigeration Field Service

ASTM B88 Standard Specification for Seamless Copper

Water Tube

ASTM C534/C534M Standard Specification for Preformed Flexible

Elastomeric Cellular Thermal Insulation in Sheet and Tubular Form

ASTM D1654 Evaluation of Painted or Coated Specimens

Subjected to Corrosive Environments

ASTM E84 Standard Test Method for Surface Burning

Characteristics of Building Materials

ASTM F1040 Standard Specification for Filter Units, Air

Conditioning, Viscous - Impingement and Dry Types, Replaceable

MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS

INDUSTRY (MSS)

MSS SP-58 Pipe Hangers and Supports - Materials, Design and Manufacture, Selection, Application, and Installation

MSS SP-69 Pipe Hangers and Supports - Selection and

Application (ANSI Approved American National Standard)

April 2019 Page 3 Section 23 81 00

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA ICS 1 Standard for Industrial Control and Systems:

General Requirements

NEMA ICS 2 Standard for Controllers, Contactors, and

Overload Relays Rated 600 V

NEMA ICS 6 Enclosures

NEMA MG 1 Motors and Generators

U.S. DEPARTMENT OF DEFENSE (DOD)

MIL-DTL-5541 Chemical Conversion Coatings on Aluminum and

Aluminum Alloys

U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA)

Energy Star Energy Star Energy Efficiency Labeling System

U.S. GENERAL SERVICES ADMINISTRATION (GSA)

CID A-A-50502 Air Conditioners, (Unitary Heat Pump), Air to

Air (3,000 to 300,000 BTU)

FS OO-A-373 Air Conditioners, Single Package Type

FS OO-A-374 Air Conditioners with Remote Condensing Units or Remote Air-Cooled, and Water-Cooled Condenser Units, Unitary

UNDERWRITERS LABORATORIES (UL)

UL 109 Tube Fittings for Flammable and Combustible

Fluids, Refrigeration Service, and Marine Use

UL 484 Standard for Room Air Conditioners

UL 873 Standard for Temperature-Indicating and -

Regulating Equipment

UL 900 Standard for Air Filter Units

1.2 RELATED REQUIREMENTS

Section 23 03 00.00 20 BASIC MECHANICAL MATERIALS AND METHODS, applies to this section with the additions and modifications specified herein.

1.3 SUBMITTALS

Government approval is required for submittals. The following shall be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

April 2019 Page 4 Section 23 81 00

SD-02 Shop Drawings

Field-assembled refrigerant piping

Control system wiring diagrams

Drawings shall provide adequate detail to demonstrate compliance with contract requirements. Drawings shall consist of:

(1) Equipment layouts which identify assembly and installation details.

(2) Piping layouts which identify valves and fittings.

(3) Plans and elevations which identify clearances required for maintenance and operation.

(4) Wiring diagrams which identify each component individually and interconnected or interlocked relationships between components.

(5) Foundation drawings, bolt-setting information, and foundation bolts prior to concrete foundation construction for equipment indicated or required to have concrete foundations.

(6) Details, if piping and equipment are to be supported other than as indicated, which include loadings and type of frames, brackets, stanchions, or other supports.

(7) Automatic temperature control diagrams and control sequences.

(8) Installation details which include the amount of factory set superheat and corresponding refrigerant pressure/temperature.

SD-03 Product Data

Room air conditioners

Packaged terminal units

Heat pumps, air to air

Air conditioners

Submit documentation for Energy Star qualifications or meeting FEMP requirements. Indicate Energy Efficiency Rating.

Air-Conditioning/Heat Pump System

Manufacturer's standard catalog data, prior to the purchase or installation of a particular component, shall be highlighted to show brand name, model number, size, options, performance charts and curves, etc. in sufficient detail to demonstrate compliance with contract requirements. Data shall be submitted for each specified component. Data shall include manufacturer's recommended installation instructions and procedures. If vibration isolation is specified for a unit, vibration isolator literature shall be

April 2019 Page 5 Section 23 81 00 included containing catalog cuts and certification that the isolation characteristics of the isolators provided meet the manufacturer's recommendations.

Water Treatment Systems

Six complete copies of the proposed water treatment plan including a layout, control scheme, a list of existing make-up water conditions, a list of the types and proportions of chemicals used, the final treated water conditions, and a description of all environmental concerns for handling the chemicals.

Thermostats

Refrigerant piping and accessories

Coatings for finned tube coils

For packaged terminal units, include indoor noise rating.

SD-06 Test Reports

Salt-spray tests

Start-up and initial operational tests

Six copies of each test containing the information described below in bound 8-1/2 x 11 inch booklets. Individual reports shall be submitted for the condenser water system, refrigerant system, ductwork leak tests, and the cooling tower tests.

(1) The date the tests were performed.

(2) A list of equipment used, with calibration certifications.

(3) Initial test summaries.

(4) Repairs/adjustments performed.

(5) Final test results.

Condenser Water Quality Tests

Test reports, each month for a period of one year after project completion, in bound 8-1/2 x 11 inch booklets. The reports shall identify the chemical composition of the condenser water. The reports shall also include a comparison of the manufacturer's recommended operating conditions for the cooling tower and condenser in relation to the condition of the condenser water. Any required corrective action shall be documented within the report.

System Performance Tests

Six copies of the report shall be provided in bound 8-1/2 x 11 inch booklets. The report shall document compliance with the specified performance criteria upon completion and testing of the system.

April 2019 Page 6 Section 23 81 00

The report shall indicate the number of days covered by the tests and any conclusions as to the adequacy of the system. The report shall also include the following information and shall be taken at least three different times at outside dry-bulb temperatures that are at least 5 degrees F apart:

(1) Date and outside weather conditions.

(2) The load on the system based on the following:

(a) The refrigerant used in the system.

(b) Condensing temperature and pressure.

(c) Suction temperature and pressure.

(d) Ambient, condensing and coolant temperatures

(e) Running current, voltage and proper phase sequence for each phase of all motors.

(3) The actual on-site setting of operating and safety controls.

(4) Thermostatic expansion valve superheat - value as determined by field test

(5) Sub-cooling

(6) High and low refrigerant temperature switch set-points

(7) Low oil pressure switch set-point

(8) Defrost system timer and thermostat set-points

(9) Moisture content

(10) Capacity control set-points

(11) Field data and adjustments which affect unit performance and energy consumption.

(12) Field adjustments and settings which were not permanently marked as an integral part of a device.

SD-08 Manufacturer's Instructions

Room air conditioners

Packaged terminal units

Heat pumps, air to air

Air conditioners

Filters

Thermostats

Refrigerant piping and accessories

April 2019 Page 7 Section 23 81 00

SD-10 Operation and Maintenance Data

Room air conditioners, Data Package 3

Packaged terminal units, Data Package 3

Heat pumps, air to air, Data Package 3

Air conditioners, Data Package 3

Filters, Data Package 2

Thermostats, Data Package 2

Submit in accordance with Section 01 78 23 OPERATION AND

MAINTENANCE DATA.

Maintenance Manual

Six complete copies of maintenance manual in bound 8-1/2 x 11 inch booklets listing routine maintenance procedures, possible breakdowns and repairs, and a trouble shooting guide. The manuals shall include piping and equipment layouts and simplified wiring and control diagrams of the system as installed.

SD-11 Closeout Submittals

Posted operating instructions

Framed instructions for posting, at least 2 weeks prior to construction completion.

1.4 QUALITY ASSURANCE

1.4.1 Modification of References

Accomplish work in accordance with the referenced publications, except as modified by this section. Consider the advisory or recommended provisions to be mandatory, as though the word "shall" had been substituted for the words "should" or "could" or "may," wherever they appear. Interpret reference to "the Authority having jurisdiction," "the Administrative Authority," "the Owner," or "the Design Engineer" to mean the Contracting Officer.

1.4.2 Detail Drawing

For refrigerant piping, submit piping, including pipe sizes. Submit control system wiring diagrams.

1.4.3 Safety

Design, manufacture, and installation of unitary air conditioning equipment shall conform to ANSI/ASHRAE 15 & 34.

April 2019 Page 8 Section 23 81 00

1.4.4 Posted Operating Instructions

Submit posted operating instructions for each packaged air conditioning unit.

1.4.5 Sizing

Size equipment based on Design Manual CS from the Air Conditioning Contractors of America; do not oversize.

1.5 REFRIGERANTS

Refrigerant shall be in accordance with Tinker Air Force Base Refrigerant Management Guidelines. Refrigerants shall have an Ozone Depletion Factor (ODF) or Ozone Depletion Potential (ODP) of 0.000. CFCs and HCFCs, and Halons shall not be permitted. Refrigerant shall be R134a unless application dictates an alternative refrigerant must be used for performance reasons. Submit alternative and reason for need to government for approval.

1.6 ENVIRONMENTAL REQUIREMENTS

For proper Indoor Environmental Quality, maintain positive pressure within the building unless application has unique or additional requirements.

Ventilation shall meet or exceed ASHRAE 62.1 and all published addenda.

Meet or exceed filter media efficiency as tested in accordance with ASHRAE

52.2. Thermal comfort shall meet or exceed ASHRAE 55.

1.7 SUSTAINABLE DESIGN REQUIREMENTS

1.7.1 Local/Regional Materials

Use materials or products extracted, harvested, or recovered, as well as manufactured, within a 500 mile radius from the project site, if available from a minimum of three sources.

PART 2 PRODUCTS

Equipment having a higher efficiency than required by ASHRAE 90.1 - IP shall be provided if shown to be life-cycle cost effective. Minimum efficiencies shall be according to Energy Star and FEMP recommendations.

2.1 ROOM AIR CONDITIONERS

AHAM RAC-1 and UL 484. Minimum energy efficiency ratio (SEER) shall be in accordance with ASHRAE 90.1 - IP, at a minimum. A 14.0 or better SEER unit shall be provided where and when available. Minimum integrated part load value (IPLV) shall be in accordance with ASHRAE 90.1 - IP, at a minimum.

Provide units removable from inside the building for servicing without removing the outside cabinet.

Unit shall be a window or through-the-wall mounted, appliance grade, factory assembled air-conditioner unit. Unit shall be in accordance with AHAM Directory and UL 484. Units shall include a self-contained, pre-charged, slide-in and removable chassis-mounted, air-cooled refrigeration system.

April 2019 Page 9 Section 23 81 00

Cooling section shall be equipped with a filter-drier on the suction line.

Fan and condenser motors shall have open, drip-proof, totally enclosed or explosion proof enclosures.

Construct outside cabinets, including metal grilles to protect condenser coils, of zinc-coated steel or aluminum. Steel and zinc-coated surfaces shall receive at least one coat of primer and manufacturer's standard factory-applied finish Insulate cabinets to prevent condensation and run off of moisture. Provide mounting hardware made of corrosion-resistant material or protected by a corrosion-resistant finish.

Cabinet shall be free of visible fasteners, sharp protuberances and edges.

Enclosure sheet metal shall be a minimum of 18 gauge steel with a protective coating. Face panels shall be removable and shall provide full access to unit appurtenances. Access to controls shall be without removal of the face panel. Conditioned air shall discharge through adjustable louvers. Cabinet shall be thermally and acoustically insulated with materials which conform to NFPA 90A. Units shall be furnished with a field-wired or prewired sub-base. Sub-base shall have leveling screws without provisions for remote unit control. Sub-base shall be of 18 gauge galvanized steel construction with a protective coating to match that of the room cabinet. Paint and finishes shall comply with the requirements specified in paragraph "Factory Coating".

Any required duct extension shall consist of 18 gauge minimum galvanized steel plenum extender with all necessary internal dampers and baffles to divert the supply air as indicated. Duct extension shall be painted with a protective coating that matches room cabinet.

Provide air filters of the throw-away type removable without the use of tools and arranged to filter both room and ventilating air.

Remove condensate by means of a drain or by evaporation and diffusion.

Provide with metal or plastic mounting flanges on each side, top, and bottom of unit.

For thru-the-wall installations provide aluminum or shop painted zinc-coated steel flanged telescopic wall sleeves. Design wall sleeves to restrict driving rain.

Outside air louver shall be storm proof type, constructed of anodized, stamped or extruded aluminum. Sleeve shall be a water and airtight completely insulated assembly, with weather-resistant protective coating.

For window mounted units provide shop-painted metal mounting brackets, braces, and sill plates. Mount compressors on vibration isolators. Minimum cooling capacity shall be not less than that indicated. Provide units listed in the AHAM RAC-1.

2.1.1 Units for Operation on 115 Volts

Provide 3-wire cords of manufacturer's standard length. If not existing, provide a receptacle within reach of the standard length cord. Cords shall have a 15- or 20-amp, 3-pole, 125-volt ground type plug to match receptacle.

2.1.2 Units for Operation on 208 or 230 Volts

April 2019 Page 10 Section 23 81 00

Provide 3-wire cords of manufacturer's standard length. If not existing, provide a receptacle within reach of the standard length cord. Cords shall have a 15-, 20-, or 30-amp, 3-pole, 250-volt ground type plug to match receptacle.

2.1.3 Controls

Controls shall include an on-off switch, high and low selector switch for both the heating and cooling mode, multiple speed fan cooling and heating mode, room air fan switch, outside air damper control, and an adjustable cooling and heating thermostat.

Function and temperature controls shall be integral to unit or remotely mounted as indicated or as accepted by the Contracting Officer.

2.2 PACKAGED TERMINAL UNITS

Equipment having a higher efficiency than required by ASHRAE 90.1 - IP shall be provided if shown to be life-cycle cost effective.

Unit shall be a through-the-wall mounted, heavy-duty commercial grade, factory assembled and pre-charged air-conditioner or heat pump unit as indicated. Unit shall be in accordance with ARI 310/380 and UL 1995.

Units shall be removable from inside the building for servicing without removing the outside cabinet. Unit shall have a noise rating in accordance with ARI 350 and not exceed indicated bells while the entire unit is operating at any fan or compressor speed. Heat pump units shall contain a reversing valve to change unit to heating cycle. An outdoor coil temperature sensor shall be provided to guard against coil freeze-up by either switching to supplemental heat only, or by cycling the compressor to defrost the coil.

2.2.1 Heat Pumps

ANSI/AHRI/CSA 310/380, UL 484, air-cooled, thru-wall type, ARI certified, and UL listed. Minimum energy efficiency shall be in accordance with ASHRAE

90.1 - IP, at a minimum. Heat pumps shall have a minimum energy efficiency ratio (EER) of 12.0, a minimum Coefficient of Performance (COP) of 3.2, and a minimum integrated part load value (IPLV) of 10.4. Provide units listed in AHRI DCAACP. Provide units suitable for use with minimal ductwork having a total external static resistance up to 0.1 inch of water.

2.2.2 Air Conditioners

Air conditioners with a minimum SEER of 14.0 are readily available and shall be provided where and when available.

ANSI/AHRI/CSA 310/380, UL 484, air-cooled, thru-wall type, ARI certified, and UL listed. Provide units with heating only, cooling only, or combination heating and cooling section depending on application with indicated capacity. Minimum energy efficiency ratio (SEER) shall be in accordance with ASHRAE 90.1 - IP, at a minimum. Minimum integrated part load value (IPLV) shall be in accordance with ASHRAE 90.1 - IP, at a minimum. Provide units listed in AHRI DCAACP. Provide units suitable for use with minimal ductwork having a total external static resistance up to

0.1 inch of water.

April 2019 Page 11 Section 23 81 00

2.2.3 Indoor Noise Rating

Rate in accordance with AHRI 350. Indoor rating shall not exceed the application or project document requirements while entire unit is operating at any fan or compressor speed.

2.2.4 Room Cabinets

Fabricate of 18-gage minimum steel (MSS). Provide removable front panel and access panels for equipment machinery, coils, controls, and filters. In lieu of steel, front panel may be constructed of high impact styrene structural foam conforming to requirements of UL 484. Structural foam shall pass tests specified in UL 484 for classification of 94 HB. Line interior of steel cabinets with insulation having a fire hazard rating not exceeding 25 for flame spread, and 50 for smoke developed, as determined by ASTM E84. Caulk around floor mounted units at the floor. Locate wall-mounted units 2 1/2 inches minimum above the floor.

Cabinet shall be free of visible fasteners, sharp protuberances and edges.

Enclosure sheet metal shall be a minimum of 18 gauge steel with a protective coating. Face panels shall be removable and shall provide full access to unit appurtenances. Access to controls shall be without removal of the face panel. Conditioned air shall discharge through adjustable louvers. Cabinet shall be thermally and acoustically insulated with materials which conform to NFPA 90A. Units shall be furnished with a field-wired or prewired sub-base. Sub-base shall have leveling screws without provisions for remote unit control. Sub-base shall be of 18 gauge galvanized steel construction with a protective coating to match that of the room cabinet. Paint and finishes shall comply with the requirements specified in paragraph "Factory Coating".

2.2.5 Grilles

Provide manufacturer's standard or architectural anodized aluminum outdoor grilles and caulk and seal on all sides when required by manufacturer's instructions. Provide both horizontal and vertical adjustable deflection inside air supply grilles. Provide for air return under the front panel or a return air grille in the lower part of the front panel.

2.2.6 Wall Sleeves and Mounts

Provide manufacturer's standard wall sleeves and mounts. Wall sleeves shall have seals designed to restrict driving rain and wind. Provide unit subbase of the same construction and finish as the sleeve to provide for concealed electrical connection, cord storage, and equipped with unit leveling legs.

Provide subbase with 24-volt remote control circuitry and wall mounted thermostat when applicable.

Louver shall be storm proof type, constructed of anodized, stamped or extruded aluminum. Sleeve shall be a water and airtight completely insulated assembly, with weather-resistant protective coating.

April 2019 Page 12 Section 23 81 00

2.2.7 Heating Section for Air Conditioners

a. Hot Water Coils: Serpentine type constructed of seamless copper tubes with aluminum fins mechanically or hydraulically bonded to tubes.

Provide factory-furnished tee and manual air vent on return connection.

Factory test coils at twice maximum operating pressure.

b. Steam Coils: Serpentine type constructed of red brass or seamless copper tubes with aluminum fins mechanically or hydraulically bonded to tubes. Factory test coils at twice the maximum operating pressure.

c. Heating unit shall have internal thermal insulation having a fire hazard rating not to exceed 25 for flame spread and 50 for smoke developed as determined by ASTM E84.

2.2.8 Refrigeration Sections

Completely self-contained, slide-in assembly or removable chassis with welded, hermetically sealed, air-cooled refrigeration system, outdoor fan, indoor fan, control box, and ventilation damper. Provide refrigeration sections capable of installation or removal without the use of tools.

Refrigeration sections shall include refrigeration circuit tubing, wiring, and safety controls, and shall operate down to 35 degrees F outdoor temperature and 70 degrees F indoor temperature, without compressor short cycling while delivering not less than 100 percent of rated cooling capacity.

For areas where the temperature will be below 35 degrees F and year round operation of the unit is essential, special accessories or provisions shall be provided for operation below 35 degrees F.

Units shall have drains to the building exterior to eliminate excess driving rain. Condensate shall not drain onto building exterior or interior.

a. Compressors: Hermetic type with vibration isolation devices.

Compressor shall be hermetically sealed reciprocating, rotary, or scroll type. Compressor shall be fitted with permanent split capacitor motor, overload protection, and vibration isolators.

Compressor shall be protected against high discharge pressure, loss of charge, low voltage, and short cycling.

b. Coils: Constructed of seamless copper or aluminum tubing of 3/8 inch minimum diameter with copper or aluminum fins that are mechanically bonded or soldered to tubes. Coat outdoor air coils with factory applied corrosion resistant treatment. Coils to be coated shall be part of manufacturer's standard product for capacities and ratings indicated and specified. Provide plate type fins.

Casing shall be galvanized steel or aluminum. Contact of dissimilar metals shall be avoided. Coils shall be tested in accordance with ASHRAE 15 at the factory and be suitable for the working pressure of the installed system. Each coil shall be dehydrated and sealed after testing and prior to evaluation and charging. Each unit shall be provided with a factory operating charge of refrigerant and oil or a

April 2019 Page 13 Section 23 81 00 holding charge. Unit shipped with a holding charge shall be field charged. A condensate removal system shall be provided.

c. Outdoor Fans: Direct connected centrifugal type with aluminum or plastic wheel and forward curved blades or direct connected aluminum propeller type. Fans shall be statically and dynamically balanced.

Design fans so that condensate will evaporate without drip, splash, or spray on building exterior. Fan motors shall be the inherently protected, permanent split-capacitor type.

d. Indoor Fans: Direct connected centrifugal type with aluminum, galvanized steel, or plastic wheel and forward curved blades. Fans shall be statically and dynamically balanced. Provide minimum two-speed motor with built-in overload protection. Fan motors shall be the inherently protected, permanent split-capacitor type.

2.2.9 Ventilation Damper Assembly

Delete requirement for ventilation damper when outside air is supplied to the space by a central system.

Dampers shall close on unit shutdown or loss of power and shall open on heating or cooling start-up.

2.2.10 Air Filters

Removable without use of tools, and shall filter both recirculated and ventilating air.

Filters shall be of the sectional or panel cleanable type and be capable of filtering the entire air supply.

2.2.11 Controls

Provide controls including, an adjustable thermostat, and switches, to regulate room air temperature through control of refrigerant compressors or heating elements.

Controls shall include an on-off switch, high and low selector switch for both the heating and cooling mode, multiple speed fan cooling and heating mode, room air fan switch, outside air damper control, and an adjustable cooling and heating thermostat. Function and temperature controls shall be integral to unit or remotely mounted as indicated or as accepted by the Contracting Officer.

2.3 HEAT PUMPS, AIR TO AIR

Equipment having a higher efficiency than required by ASHRAE 90.1 - IP shall be specified if shown to be life-cycle cost effective.

Provide factory assembled units complete with accessories, wiring, piping, and controls. Provide units with air filters as specified in the paragraph entitled "Filters."

April 2019 Page 14 Section 23 81 00

2.3.1 Energy Performance

Heat Pumps with a minimum SEER of 14.0 are readily available and a 14.0 SEER or better unit shall be provided where and when available.

2.3.2 Air Coils

Extended-surface fin and tube type with seamless copper or aluminum tubes of 3/8 minimum diameter with copper or aluminum fins securely mechanically bonded or soldered to the tubes. Provide a coating on outdoor air and indoor air coils as specified in the paragraph entitled "Coatings for Finned Tube Coils." Coils to be coated shall be part of manufacturer's standard product for capacities and ratings indicated and specified. Provide plate type fins.

2.3.3 Compressors

For compressors above 20 tons, compressor speed shall not exceed 3450 rpm.

For equipment over 10 tons, provide automatic capacity reduction of at least 50 percent of rated capacity. Capacity reduction may be accomplished by cylinder unloading, use of multiple, but not more than four compressors, or a combination of the two methods. Units with cylinder unloading shall start with capacity reduction devices in the unloaded position. Units with multiple compressors shall have a means to sequence starting of compressors.

Provide compressors with devices to prevent short cycling when shutdown by safety controls. Provide reciprocating compressors with crankcase heaters, and vibration isolators.

2.3.4 Mounting Provisions

Provide units that permit mounting as indicated. Provide suitable lifting attachment plates to enable equipment to be lifted to normal position.

2.3.5 Temperature Controls

Provide controls as specified in CID A-A-50502 and as modified herein.

Provide indoor thermostats of the adjustable type that conform to applicable requirements of UL 873. Provide manual means for temperature set-back.

Provide thermostats capable of controlling supplemental heat as specified in CID A-A-50502. Provide a manual selector switch or other means to permit the supplementary heater to be energized when the heat pump compressor and associated equipment are inoperative. Control supplementary heater with the room thermostat while bypassing the outdoor thermostat. Locate switch adjacent to or as an integral part of the room thermostat. An indicator light on the room thermostat or manual heat switch shall indicate when supplementary heaters are operating.

2.3.6 Accessories

In addition to accessories specified in CID A-A-50502, provide the following accessories for heat pump units.

a. Protective grille around outside unit coils

b. Start capacitor kit

April 2019 Page 15 Section 23 81 00

2.4 AIR CONDITIONERS

Select the appropriate Type, Style, and Class from the latest edition of FS OO-A-373 or FS OO-A-374.

Equipment having a higher efficiency than required by ASHRAE 90.1 - IP or CID A-A-50502 shall be specified if shown to be life-cycle cost effective.

2.4.1 Single Package Type

FS OO-A-373, except as modified herein; Additional requirements for various system components are specified in this article; however, the basic requirements for the system and system components are contained in FS OO-A-

373. Provide factory packaged cooling or combination heating and cooling units. Provide units suitable for indoor or outdoor installation as required by application. Provide units with suitable lifting attachments, roof curb and flashing, and transition plenums. Minimum energy efficiency shall be in accordance with ASHRAE 90.1 - IP, at a minimum. Air conditioners with a minimum SEER of 14.0 are readily available and a 14.0 SEER or better unit shall be provided where and when available. Provide capacity, electrical characteristics, and operating conditions as indicated.

Condensers shall provide not less than 10 degrees F liquid subcooling at standard ratings.

2.4.2 Split-System Type

FS OO-A-374, except as modified herein; Additional requirements for various system components are specified in this paragraph; however, basic requirements for the system and system components are contained in FS OO-A-

374. Provide separate assemblies designed to be used together. Base ratings on the use of matched assemblies. Provide performance diagrams for units with capacities not certified by ARI to verify that components of the air conditioning system furnished will satisfy the capacity requirement specified or indicated. Minimum energy efficiency shall be in accordance with ASHRAE 90.1 - IP, at a minimum. Systems with a minimum SEER of 14.0 are readily available and a 14.0 SEER or better unit shall be provided where and when available. Provide capacity, electrical characteristics and operating conditions as indicated. Condensers shall provide not less than 10 degrees F liquid subcooling at standard ratings.

2.4.3 Single Zone Units

Provide single zone type units arranged to draw through coil sections.

2.4.4 Multizone Units

Provide multizone type units arranged to draw through the cooling and heating sections and blow through the individual cooling and heating coils of each zone.

2.4.5 Heaters

Provide as an integral part of the evaporator-blower unit. Provide steam coils, hot water coils, or gas heaters.

April 2019 Page 16 Section 23 81 00

2.4.6 Compressors

For compressors over 20 tons, compressor speed shall not exceed 3450 rpm.

For systems over 10 tons provide automatic capacity reduction of at least 50 percent of rated capacity. Capacity reduction may be accomplished by cylinder unloading, use of multi- or variable speed compressors, use of multiple, but not more than four compressors, or a combination of the two methods. Units with cylinder unloading shall start with capacity reduction devices in the unloaded position. Units with multiple compressors shall have means to sequence starting of compressors. Provide compressors with devices to prevent short cycling when shut down by safety controls. Device shall delay operation of compressor motor for at least 3 minutes but not more than 6 minutes. Provide a pumpdown cycle for units 20 tons and over.

Provide reciprocating compressors with crankcase heaters in accordance with the manufacturer's recommendations. If compressors are paralleled, provide not less than two independent circuits.

2.4.7 Coils

Provide a separate air cooled condenser circuit for each compressor or parallel compressor installation. Provide a coating on condenser and evaporator coils and fins as specified in the paragraph entitled "Coatings for Finned Tube Coils." Coils to be coated shall be part of manufacturer's standard product for capacities and ratings indicated and specified.

Provide plate type fins.

2.4.8 Condenser Controls

Provide start-up and head pressure controls to allow for system operation at ambient temperatures down to minimum temperature at which the mechanical cooling equipment will be required to operate.

2.4.9 Fans

Provide belt-driven evaporator fans with adjustable pitch pulleys; except for units less than 5 ton capacity, direct drive with at least two speed taps may be used. Select pulleys at approximately midpoint of the adjustable range.

2.4.10 Filters

Provide filters of the type specified in this section.

2.4.11 Filter Boxes

Provide when filters are not included integral with air conditioning units.

Construct of not less than No. 20 US gage steel with track, hinged access doors with latches, and gaskets between frame and filters. Arrange filters to filter outside and return air. Provide removable filter assemblies, replaceable without the use of tools.

2.4.12 Mixing Boxes

Provide of the physical size to match the basic unit and include equal sized flanged openings, sized to individually handle full air flow. Arrange openings as indicated. Provide openings with dampers of parallel or opposed

April 2019 Page 17 Section 23 81 00 blade type. Provide opposed blade type for modulating dampers and parallel type for two-position dampers. Connect damper shafts together by one continuous linkage bar. Arrange dampers for automatic or manual operation so that when one starts to close from its opened position, the other starts to open from its closed position.

2.4.13 Thermostats

Following is typical specifications for a simple system with both single-stage cooling and single-stage heating. Modify as required to suit the application or project.

Provide adjustable type that conforms to applicable requirements of UL 873.

Provide combination heating-cooling type with contacts hermetically sealed against moisture, corrosion, lint, dust, and foreign material. Design to operate on not more than 1.5 degrees Fdifferential and of suitable range calibrated in degrees F. Provide adjustable heat anticipation and fixed cooling anticipation. Provide two independent temperature sensing elements electrically connected to control the compressor and heating equipment, respectively. Accomplish manual switching for system changeover from heating to cooling or cooling to heating and fan operation through the use of a thermostat subbase. Provide system selector switches to provide "COOL" and "OFF" and "HEAT" and fan selector switches to provide "AUTOMATIC" and "ON." Provide relays, contactors, and transformers located in a panel or panels for replacement and service.

2.4.13.1 Cooling

a. When thermostat is in "COOL" position with fan selector switch in "AUTO" position, compressor, evaporator fan, and condenser fan shall cycle together.

b. When thermostat is in "COOL" position with fan selector switch in "ON" position, compressor, and condenser fan shall cycle together and evaporator fan shall run continuously.

2.4.13.2 Heating

a. When thermostat is in "HEAT" position with fan selector switch in "AUTO" position, heater and supply air fan shall cycle together. Provide a separate thermostat to keep the fan running until the heater cools.

b. When thermostat is in "HEAT" position with fan selector switch in "ON" position, heater shall cycle and supply air fan shall run continuously.

2.4.13.3 Supply Air Fan

a. When fan selector switch is in "AUTO" position with thermostat in "OFF" position, fan shall not run.

b. When fan selector switch is in "ON" position, fan shall run continuously.

April 2019 Page 18 Section 23 81 00

2.5 FILTERS

Provide filters to filter outside air and return air and locate as indicated. Provide replaceable (throw-away) type filters . Filters shall conform to UL 900 . Polyurethane filters shall not be used on units with multiframe filters.

2.5.1 Replaceable Type Filters

ASTM F1040 throw-away frames and media, standard dust holding capacity, 350 fpm maximum face velocity, and 2 inches thick. Filters shall have a minimum efficiency reporting value as required by project documents when tested in accordance with ASHRAE 52.2.

2.5.2 High Efficiency Filters

Filters shall have a MERV of 17 when tested in accordance with ASHRAE 52.2.

Filter assembly shall include; holding frame and fastener assembly, filter cartridge, mounting frame, and retainer assembly. Reinforce filter media with glass fiber mat. Pressure drop across clean filter shall not exceed recommended amount of watergage. Precede high efficiency filters with a UL Class 2 replaceable type filter.

2.5.3 Manometers

Provide inclined-type manometers for filter stations of 2,000 cfm capacity or larger including filters furnished as integral parts of air-handling units and filters installed separately. Provide sufficient length to read at least one inch of water column with 10 major graduations, and equipped with spirit level. Equip manometers with overpressure safety traps to prevent loss of fluid, and two three-way vent valves for checking zero setting. Mercury shall not be used as the operating fluid.

2.6 COATINGS FOR FINNED TUBE COILS

Where stipulated in equipment specifications of this section, coat finned tube coils of the affected equipment as specified below. Apply coating at the premises of a company specializing in such work. Degrease and prepare for coating in accordance with the coating applicator's procedures for the type of metals involved. Completed coating shall show no evidence of softening, blistering, cracking, crazing, flaking, loss of adhesion, or "bridging" between the fins.

2.6.1 Phenolic Coating

Provide a resin base thermosetting phenolic coating. Apply coating by immersion dipping of the entire coil. Provide a minimum of two coats. Bake or heat dry coils following immersions. After final immersion and prior to final baking, spray entire coil with particular emphasis given to building up coating on sheared edges. Total dry film thickness shall be 2.5 to 3.0 mils.

2.6.2 Chemical Conversion Coating with Polyelastomer Finish Coat

Dip coils in a chemical conversion solution to molecularly deposit a corrosion resistant coating by electrolysis action. Chemical conversion

April 2019 Page 19 Section 23 81 00 coatings shall conform to MIL-DTL-5541, Class 1A. Cure conversion coating at a temperature of 110 to 140 degrees F for a minimum of 3 hours. Coat coil surfaces with a complex polymer primer with a dry film thickness of 1 mil. Cure primer coat for a minimum of 1 hour. Using dip tank method, provide three coats of a complex polyelastomer finish coat. After each of the first two finish coats, cure the coils for 1 hour. Following the third coat, spray a fog coat of an inert sealer on the coil surfaces. Total dry film thickness shall be 2.5 to 3.0 mils. Cure finish coat for a minimum of 3 hours. Coating materials shall have 300 percent flexibility, operate in temperatures of minus 50 to plus 220 degrees F, and protect against atmospheres of a pH range of 1 to 14.

2.7 MOTORS AND STARTERS

NEMA MG 1, NEMA ICS 1, and NEMA ICS 2. Variable speed. Motors less than 1 hp shall meet NEMA High Efficiency requirements. Motors 1 hp and larger shall meet NEMA Premium Efficiency requirements. Determine specific motor characteristics to ensure provision of correctly sized starters and overload heaters. Provide motors to operate at full capacity with a voltage variation of plus or minus 10 percent of the motor voltage rating. Motor size shall be sufficient for the duty to be performed and shall not exceed its full load nameplate current rating when driven equipment is operated at specified capacity under the most severe conditions likely to be encountered. When motor size provided differs from size indicated or specified, the Contractor shall make the necessary adjustments to the wiring, disconnect devices, and branch circuit protection to accommodate equipment actually provided. Provide the application or project required type of starter enclosures in accordance with NEMA ICS 6.

Reduced voltage starters shall be used when voltage-regulation problems are anticipated including inadequate power supply, poor distribution facilities, and presence of electrical or electronic equipment sensitive to voltage fluctuation.

2.8 REFRIGERANT PIPING AND ACCESSORIES

Provide accessories as specified in FS OO-A-373, FS OO-A-374, or CID A-A- 50502 and this section. Provide suction line accumulators as recommended by equipment manufacturer's installation instructions. Provide a filter-drier in the liquid line.

2.8.1 Factory Charged Tubing

Provide extra soft, deoxidized, bright annealed copper tubing conforming to ASTM B280, factory dehydrated and furnished with a balanced charge of refrigerant recommended by manufacturer of equipment being connected.

Factory insulate suction line tubing with 3/8 inch minimum thickness of closed cell, foamed plastic conforming to ASTM C534/C534M with a permeance rating not to exceed 1.0. Provide quick-connectors with caps or plugs to protect couplings. Include couplings for suction and liquid line connections of the indoor and outdoor sections.

2.8.2 Field-Assembled Refrigerant Piping

Material and dimensional requirements for field-assembled refrigerant piping, valves, fittings, and accessories shall conform to ANSI/ASHRAE 15 &

April 2019 Page 20 Section 23 81 00

34 and ASME B31.5, except as herein specified. Factory clean, dehydrate, and seal piping before delivery to the project location. Provide seamless copper tubing, hard drawn, Type K or L, conforming to ASTM B88, except that tubing with outside diameters of 1/4 inch and 3/8 inch shall have nominal wall thickness of not less than 0.030 inch and 0.032 inch, respectively.

Soft annealed copper tubing conforming to ASTM B280 may be used where flare connections to equipment are required only in nominal sizes less than one inch outside diameter.

2.8.3 Fittings

ASME B16.22 for solder-joint fittings. UL 109 for flared tube fittings.

2.8.4 Brazing Filler Material

AWS A5.8/A5.8M.

2.8.5 Pipe Hangers and Supports

MSS SP-69 and MSS SP-58, except as indicated otherwise.

2.8.6 Pipe Sleeves

Provide sleeves where piping passes through walls, floors, roofs, and partitions. Secure sleeves in proper position and location during construction. Provide sleeves of sufficient length to pass through entire thickness of walls, floors, roofs, and partitions. Provide not less than

0.25 inch space between exterior of piping or pipe insulation and interior of sleeve. Firmly pack space with insulation and caulk at both ends of the sleeve with plastic waterproof cement which will dry to a firm but pliable mass, or provide a segmented elastomeric seal.

2.8.6.1 Sleeves in Masonry and Concrete Walls, Floors, and Roofs

Provide Schedule 40 or Standard Weight zinc-coated steel pipe sleeves.

Extend sleeves in floor slabs 3 inches above finished floor.

2.8.6.2 Sleeves in Partitions and Non-Masonry Structures

Provide zinc-coated steel sheet sleeves having a nominal weight of not less than 0.90 pound per square foot, in partitions and other than masonry and concrete walls, floors, and roofs.

2.9 FINISHES

Provide steel surfaces of equipment including packaged terminal units, heat pumps, and air conditioners, that do not have a zinc coating conforming to ASTM A123/A123M or ASTM A653/A653M, or a duplex coating of zinc and paint, with a factory applied coating or paint system. Provide a coating or paint system on actual equipment identical to that on salt-spray test specimens with respect to materials, conditions of application, and dry-film thickness.

April 2019 Page 21 Section 23 81 00

2.10 SOURCE QUALITY CONTROL

2.10.1 Salt-Spray Tests

Salt-spray test the factory-applied coating or paint system of equipment including packaged terminal units, heat pumps, and air conditioners in accordance with ASTM B117. Conduct test for 500 hours for equipment installed outdoors, or 125 hours for equipment installed indoors. Test specimens shall have a standard scribe mark as defined in ASTM D1654. Upon completion of exposure, evaluate and rate the coating or paint system in accordance with procedures A and B of ASTM D1654. Rating of failure at the scribe mark shall not be less than six, average creepage not greater than 1/8 inch. Rating of the unscribed area shall not be less than 10, no failure.

PART 3 EXECUTION

3.1 EQUIPMENT INSTALLATION

Install equipment and components in a manner to ensure proper and sequential operation of equipment and equipment controls. Install equipment not covered in this section, or in manufacturer's instructions, as recommended by manufacturer's representative. Provide proper foundations for mounting of equipment, accessories, appurtenances, piping and controls including, but not limited to, supports, vibration isolators, stands, guides, anchors, clamps and brackets. Foundations for equipment shall conform to equipment manufacturer's recommendation, unless otherwise indicated. Set anchor bolts and sleeves using templates. Provide anchor bolts of adequate length, and provide with welded-on plates on the head end embedded in the concrete.

Level equipment bases, using jacks or steel wedges, and neatly grout-in with a nonshrinking type of grouting mortar. Locate equipment to allow working space for servicing including shaft removal, disassembling compressor cylinders and pistons, replacing or adjusting drives, motors, or shaft seals, access to water heads and valves of shell and tube equipment, tube cleaning or replacement, access to automatic controls, refrigerant charging, lubrication, oil draining and working clearance under overhead lines.

Provide electric isolation between dissimilar metals for the purpose of minimizing galvanic corrosion.

3.1.1 Packaged Terminal Air Conditioners and Heat Pumps

Wall sleeve installation shall provide a positive weathertight and airtight seal.

3.1.2 Unitary Air Conditioning System

Install as indicated, in accordance with requirements of ANSI/ASHRAE 15 & 34, and the manufacturer's installation and operational instructions.

3.1.3 Room Air Conditioners

Install units in accordance with manufacturer's instructions. Provide structural mountings, closures, and seals for weathertight assembly. Pitch unit as recommended by manufacturer to ensure condensate drain to drain pan without overflow.

April 2019 Page 22 Section 23 81 00

3.2 PIPING

Brazing, bending, forming and assembly of refrigerant piping shall conform to ASME B31.5.

3.2.1 Pipe Hangers and Supports

Design and fabrication of pipe hangers, supports, and welding attachments shall conform to MSS SP-58. Installation of hanger types and supports for bare and covered pipes shall conform to MSS SP-69 for the system temperature range. Unless otherwise indicated, horizontal and vertical piping attachments shall conform to MSS SP-58.

3.2.2 Refrigerant Piping

Cut pipe to measurements established at the site and work into place without springing or forcing. Install piping with sufficient flexibility to provide for expansion and contraction due to temperature fluctuation. Where pipe passes through building structure pipe joints shall not be concealed, but shall be located where they may be readily inspected. Install piping to be insulated with sufficient clearance to permit application of insulation.

Install piping as indicated and detailed, to avoid interference with other piping, conduit, or equipment. Except where specifically indicated otherwise, run piping plumb and straight and parallel to walls and ceilings.

Trapping of lines will not be permitted except where indicated. Provide sleeves of suitable size for lines passing through building structure.

Braze refrigerant piping with silver solder complying with AWS A5.8/A5.8M.

Inside of tubing and fittings shall be free of flux. Clean parts to be jointed with emery cloth and keep hot until solder has penetrated full depth of fitting and extra flux has been expelled. Cool joints in air and remove flame marks and traces of flux. During brazing operation, prevent oxide film from forming on inside of tubing by slowly flowing dry nitrogen through tubing to expel air. Make provisions to automatically return oil on halocarbon systems. Installation of piping shall comply with ASME B31.5.

3.2.3 Returning Oil From Refrigerant System

Install refrigerant lines so that gas velocity in the evaporator suction line is sufficient to move oil along with gas to the compressor. Where equipment location requires vertical risers, line shall be sized to maintain sufficient velocity to lift oil at minimum system loading and corresponding reduction of gas volume. Install a double riser when excess velocity and pressure drop would result from full system loading. Larger riser shall have a trap, of minimum volume, obtained by use of 90- and 45-degree ells.

Arrange small riser with inlet close to bottom of horizontal line, and connect to top of upper horizontal line.