USACE / NAVFAC / AFCESA / NASA UFGS-23 81 00.00 20 (July 2006)
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Preparing Activity: NAVFAC Superseding
UFGS-23 81 00.00 20 (April 2006)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 23 81 00.00 20
UNITARY AIR CONDITIONING EQUIPMENT
07/06
NOTE: 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.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a Criteria Change Request
(CCR).
PART 1 GENERAL
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
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.
[AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI)AHRI 210/240(2006) Performance Rating of Unitary Air-Conditioning and Air-Source Heat Pump EquipmentAHRI 310/380(2004) Standard for Packaged Terminal Air-Conditioners and Heat PumpsAHRI 340/360(2004) Performance Rating of Commercial and Industrial Unitary Air-Conditioning and Heat Pump EquipmentAHRI 350(2000) Sound Rating of Non-Ducted Indoor Air-Conditioning EquipmentAHRI DCAACP(Online) Directory of Certified Applied Air-Conditioning ProductsAHRI DCUP(Online) Directory of Certified Unitary Products][AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING ENGINEERS (ASHRAE)ASHRAE 15 & 34WARNING: Text in tags exceeds the maximum length of 300 charactersASHRAE 52.2(2007; Addenda B 2008) Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle SizeASHRAE 55(2004; Interpertation 1: 2005; Errata 2006; Interpertation 2:2007; Errata 2007; Addendas a & B 2008) Thermal Environmental Conditions for Human OccupancyASHRAE 62.1(2007; INT 2007; INT 2-15 2008; Errata 2008; Addenda a, b, e, f and h 2008) Ventilation for Acceptable Indoor Air QualityASHRAE 90.1 - IP(2007) Energy Standard for Buildings Except Low-Rise Residential Buildings, I-P EditionASHRAE 90.1 - SI(2004; Addendas a through p, r through v, x,ak 2006; Supp to Addendas 2006; Errata 2007; Interpretations 8 - 15:2007; Errata 2008; INT 16-21 2008; Errata 2008; INT 22-26 2008) Energy Standard for Buildings Except Low-Rise Residential Buildings, SI Edition][AMERICAN WELDING SOCIETY (AWS)AWS A5.8/A5.8M(2004; Errata 2004) Specification for Filler Metals for Brazing and Braze Welding][ASME INTERNATIONAL (ASME)ASME B16.22(2001; R 2005) Standard for Wrought Copper and Copper Alloy Solder Joint Pressure FittingsASME B31.5(2006) Refrigeration Piping and Heat Transfer Components][ASSOCIATION OF HOME APPLIANCE MANUFACTURERS (AHAM)AHAM RAC-1(2005) Directory of Certified Room Air Conditioners][ASTM INTERNATIONAL (ASTM)ASTM A 123/A 123M(2008) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel ProductsASTM A 653/A 653M(2008) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip ProcessASTM B 117(2007a) Standing Practice for Operating Salt Spray (Fog) ApparatusASTM B 280(2008) Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field ServiceASTM B 88(2003) Standard Specification for Seamless Copper Water TubeASTM B 88M(2005) Standard Specification for Seamless Copper Water Tube (Metric)ASTM C 534/C 534M(2008) Standard Specification for Preformed Flexible Elastomeric Cellular Thermal Insulation in Sheet and Tubular FormASTM D 1654(2008) Evaluation of Painted or Coated Specimens Subjected to Corrosive EnvironmentsASTM E 2129(2005) Standard Practice for Data Collection for Sustainability Assessment of Building ProductsASTM E 84(2008a) Standard Test Method for Surface Burning Characteristics of Building MaterialsASTM F 1040(1987; R 2007) Standard Specification for Filter Units, Air Conditioning, Viscous - Impingement and Dry Types, ReplaceableASTM F 872(1984; R 1990) Filter Units, Air Conditioning: Viscous-Impingement Type, Cleanable][MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS INDUSTRY (MSS)MSS SP-58(2002) Standard for Pipe Hangers and Supports - Materials, Design and ManufactureMSS SP-69(2003; R 2004) Standard for Pipe Hangers and Supports - Selection and Application][NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NEMA ICS 1(2000; R 2005; R 2008) Standard for Industrial Control and Systems General RequirementsNEMA ICS 2(2000; Errata 2002; R 2005; Errata 2006) Standard for Industrial Control and Systems: Controllers, Contractors, and Overload Relays Rated Not More than 2000 Volts AC or 750 Volts DC: Part 8 - Disconnect Devices for Use in Industrial Control EquipmentNEMA ICS 6(1993; R 2006) Standard for Industrial Controls and Systems EnclosuresNEMA MG 1(2007; Errata 2008) Standard for Motors and Generators][U.S. DEPARTMENT OF DEFENSE (DOD)MIL-DTL-5541(Rev F) Chemical Conversion Coatings on Aluminum and Aluminum Alloys][U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA)Energy Star(1992; R 2006) Energy Star Energy Efficiency Labeling System][U.S. GENERAL SERVICES ADMINISTRATION (GSA)FS A-A-50502(Basic) Air Conditioners, (Unitary Heat Pump), Air to Air (3,000 to 300,000 BTU)FS OO-A-373(Rev D) Air Conditioners, Single Package TypeFS OO-A-374(Rev C) Air Conditioners with Remote Condensing Units or Remote Air-Cooled, and Water-Cooled Condenser Units, Unitary][U.S. GREEN BUILDING COUNCIL (USGBC)LEED(2002; R 2005) Leadership in Energy and Environmental Design(tm) Green Building Rating System for New Construction (LEED-NC)][UNDERWRITERS LABORATORIES (UL)UL 109(1997; Rev Jan 2005) Tube Fittings for Flammable and Combustible Fluids, Refrigeration Service, and Marine UseUL 484(2007) Room Air ConditionersUL 873(2007)Temperature-Indicating and -Regulating EquipmentUL 900(2004; Rev thru Nov 2007) Standard for Air Filter Units]1.2 DEFINITION
a. Year 2000 compliant - means computer controlled facility components that accurately process
date and time data (including, but not limited to, calculating, comparing, and sequencing) from,
into, and between the twentieth and twenty-first centuries, and the years 1999 and 2000 and
leap year calculations.
1.3 RELATED REQUIREMENTS
Section 23 03 00.00 20 BASIC MECHANICAL MATERIALS AND METHODS, applies to this section with the additions and
modifications specified herein.
1.4 SUBMITTALS
NOTE: Submittals must be limited to those necessary for adequate quality control.
The importance of an item in the project should be one of the primary factors
in determining if a submittal for the item should be required.
A “G” following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a “G”. Only delete an existing
“G” if the submittal item is not complex and can be reviewed through the Contractor’s
Quality Control system. Only add a “G” if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "AE" for Architect-Engineer; "DO"
for District Office (Engineering Division or other organization in the District
Office); "AO" for Area Office; "RO" for Resident Office; and "PO" for Project
Office. Codes following the "G" typically are not used for Navy projects.
Submittal items not designated with a "G" are considered as being for information
only for Army projects and for Contractor Quality Control approval for Navy
projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are [for Contractor Quality Control approval.][for information only. When used, a designation following the
"G" designation identifies the office that will review the submittal for the Government.] The following shall
be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
Field-assembled refrigerant piping
Control system wiring diagrams
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.
Filters; (LEED)
[ Submit documentation indicating type of biobased material in product and biobased content.
Indicate relative dollar value of biobased content products to total dollar value of products
included in project. Submit documentation indicating relative dollar value of rapidly renewable
materials to total dollar value of products included in project.]
Thermostats
Refrigerant piping and accessories
Coatings for finned tube coils
For packaged terminal units, include indoor noise rating.
[Local/Regional Materials
Submit documentation indicating distance between manufacturing facility and the project site.
Indicate distance of raw material origin from the project site. Indicate relative dollar value
of local/regional materials to total dollar value of products included in project.]
[Environmental Data]
SD-06 Test Reports
Salt-spray tests
Start-up and initial operational tests
SD-08 Manufacturer's Instructions
Room air conditioners
Packaged terminal units
Heat pumps, air to air
Air conditioners
Filters
Thermostats
Refrigerant piping and accessories
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.
SD-11 Closeout Submittals
Posted operating instructions
1.5 QUALITY ASSURANCE
1.5.1 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.
1.5.2 Detail Drawing
For refrigerant piping, submit piping, including pipe sizes. Submit control system wiring diagrams.
1.5.3 Safety
Design, manufacture, and installation of unitary air conditioning equipment shall conform to ASHRAE 15 & 34
.
1.5.4 Posted Operating Instructions
Submit posted operating instructions for each packaged air conditioning unit.
1.5.5 Sizing
Size equipment based on Design Manual CS from the Air Conditioning Contractors of America; do not oversize.
1.6 REFRIGERANTS
NOTE: EPA, per the Significant New Alternative Policy rule, reviews refrigerant
substitutes on the basis of ozone depletion potential, global warming potential,
toxicity, flammability, and exposure potential. Lists of acceptable and unacceptable
substitutes are updated several times each year. A chronological list of SNAP
updates is available at http://www.epa.gov/ozone/snap/refrigerants/lists/index.html
or from the stratospheric ozone information hotline at 1 (800) 296-1996. Reducing
ozone depletion and global warming potential by reducing or eliminating CFC,
HCFC, and Halon use in air conditioning equipment contributes to the following
LEED credits: EA Prerequisite 3; EA4.
Refrigerants shall have an Ozone Depletion Factor (ODF) of 0.05 or less. The ODF shall be in accordance with
the "Montreal Protocol On Substances That Deplete The Ozone Layer," September 1987, sponsored by the United Nations
Environment Programme. CFCs[ and HCFCs][ and Halons] shall not be permitted. Refrigerant shall be an approved
alternative refrigerant per EPA's Significant New Alternative Policy (SNAP) listing. [Use HCFC-22 refrigerant.]
1.7 ENVIRONMENTAL REQUIREMENTS
For proper Indoor Environmental Quality, maintain positive pressure within the building. 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.
1.8 SUSTAINABLE DESIGN REQUIREMENTS
1.8.1 Local/Regional Materials
NOTE: Using local materials can help minimize transportation impacts, including
fossil fuel consumption, air pollution, and labor.
Use materials or products extracted, harvested, or recovered, as well as manufactured, within a [500][_____]
mile [800][_____] kilometer radius from the project site, if available from a minimum of three sources.
1.8.2 Environmental Data
NOTE: ASTM E 2129 provides for detailed documentation of the sustainability
aspects of products used in the project. This level of detail may be useful
to the Contractor, Government, building occupants, or the public in assessing
the sustainability of these products.
[Submit Table 1 of ASTM E 2129 for the following products: [_____].]
PART 2 PRODUCTS
NOTE: Equipment having a higher efficiency than required by ASHRAE 90.1 or
FS A-A-50502 shall be specified if shown to be life-cycle cost effective. Minimum
efficiencies shall be according to Energy Star (http://www.energystar.gov/index.cfm?fuseaction=find_a_product.
) and FEMP (http://www.eere.energy.gov/femp/technologies/eeproducts.cfm) recommendations.
The Energy Policy Act of 2005 requires new buildings to use 30 percent less
energy than the ASHRAE 90.1 level. Efficient cooling equipment and components
contribute to the following LEED credits: EA Prerequisite 2; EA1.
2.1 ROOM AIR CONDITIONERS
NOTE: FEMP recommends a SEER of 12.0 for air conditioners smaller than 65 MBtu/hr,
an EER of 11.0 and IPLV of 11.4 for 65 to 135 MBtu/hr air conditioners, and
an EER of 10.8 and IPLV of 11.2 for 135 to 240 MBtu/hr air conditioners. Air
conditioners with a SEER of 14.0 are readily available.
AHAM RAC-1 and UL 484. Minimum [seasonal ]energy efficiency ratio ([S]EER) shall be [in accordance with ASHRAE 90.1 - SI
ASHRAE 90.1 -
IP, at a minimum.] [ [_____] [S]EER.] [Minimum integrated part load value (IPLV) shall be [in accordance with
ASHRAE 90.1 - SI ASHRAE 90.1 -
IP, at a minimum.] [[_____] IPLV.]] Provide units removable from inside the building for servicing without removing
the outside cabinet. 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. Provide
air filters of the [throw-away] [or] [permanent washable] 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. 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. [Provide light tight units serving dark rooms.]
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
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
Mount controls in cabinet. Manual controls shall permit operation of either the fan or the fan and refrigerating
equipment. Fan control shall provide two fan speed settings. Automatic controls shall include a thermostat
for controlling air temperature. Thermostat shall have an adjustable range, including 22 to 27 degrees C 72
to 80 degrees Fand shall automatically turn the refrigeration system on or off to maintain the preselected temperature
within plus or minus 20 degrees C 4 degrees F.
2.2 PACKAGED TERMINAL UNITS
NOTE: Equipment having a higher efficiency than required by ASHRAE 90.1 or
FS A-A-50502 shall be specified if shown to be life-cycle cost effective. The
Energy Policy Act of 2005 requires new buildings to use 30 percent less energy
than the ASHRAE 90.1 level.
NOTE: Include "suitability for ductwork" requirement when part of conditioned
air is to be ducted to an adjacent room. Require factory fabricated duct package.
2.2.1 Heat Pumps
NOTE: FEMP recommends 12.0 SEER and 7.7 HSPF for small (less than 65 MBtu/hr)
air-cooled heat pumps; 10.1 EER, 10.4 IPLV, and 3.2 COP for medium (65-135 MBtu/hr)
air-cooled heat pumps; and 9.3 EER, 9.5 IPLV, and 3.1 COP for large (136-240
MBtu/hr) air-cooled heat pumps.
AHRI 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 - SI ASHRAE 90.1 - IP, at a minimum.] [Heat pumps shall have a minimum energy
efficiency ratio (EER) of [_____], a minimum Coefficient of Performance (COP) of [_____], and a minimum integrated
part load value (IPLV) of [_____].] Provide units listed in AHRI DCAACP. [Provide supplemental electric resistance
heaters integral with unit.] [Provide units suitable for use with minimal ductwork having a total external static
resistance up to 25 Pa 0.1 inch of water.]
2.2.2 Air Conditioners
NOTE: FEMP recommends a SEER of 12.0 for air conditioners smaller than 65 MBtu/hr,
an EER of 11.0 and IPLV of 11.4 for 65 to 135 MBtu/hr air conditioners, and
an EER of 10.8 and IPLV of 11.2 for 135 to 240 MBtu/hr air conditioners. Air
conditioners with a SEER of 14.0 are readily available.
AHRI 310/380, UL 484, air-cooled, thru-wall type, ARI certified, and UL listed. Provide units with [heating
only] [cooling only] [combination heating and cooling] section with indicated capacity. Minimum [seasonal ]energy
efficiency ratio ([S]EER) shall be [in accordance with ASHRAE 90.1 - SI ASHRAE 90.1 - IP, at a minimum.] [[_____]
[S]EER.] [Minimum integrated part load value (IPLV) shall be [in accordance with ASHRAE 90.1 - SI ASHRAE 90.1 - IP
, at a minimum.] [[_____] IPLV.]] Provide units listed in AHRI DCAACP. [Provide units suitable for use with
minimal ductwork having a total external static resistance up to 25 Pa 0.1 inch of water.]
2.2.3 Indoor Noise Rating
NOTE: Develop and specify the sound level requirements for specific equipment
applications. Ensure at least three manufacturers can meet the noise rating
specified.
Rate in accordance with AHRI 350. Indoor rating shall not exceed [_____] bels while entire unit is operating
at any fan or compressor speed.
2.2.4 Room Cabinets
Fabricate of 18-gage minimum steel (MSS). Provide removeable front panel and access panels for equipment machinery,
coils, controls, and filters. In lieu of steel, front panel may be constructed of high impact styrine 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 E 84. Caulk around floor mounted units at the floor.
Locate wall-mounted units 65 mm 2 1/2 inches minimum above the floor.
2.2.5 Grilles
Provide manufacturer's [standard] [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.]
2.2.7 Heating Section for Air Conditioners
NOTE: Choose the applicable text from the following.
[a. Electric Coils: Electric resistance heating elements with high temperature-limit safety
device, factory-mounted, and wired to chassis.]
[b. 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.]
[c. 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.]
d. 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 E 84.
2.2.8 Refrigeration Sections
NOTE: Several manufacturers' units have a low operating temperature of 2 degrees
C 35 degrees F as standard. For areas where the temperature will be below 2
degrees C 35 degrees F and year round operation of the unit is essential, special
accessories will have to be specified for operation below 2 degrees C 35 degrees
F.
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 2 degrees C 35 degrees F outdoor temperature
and 21 degrees C 70 degrees F indoor temperature, without compressor short cycling while delivering not less
than 100 percent of rated cooling capacity. 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.
NOTE: Research project location conditions to determine the environmental effects
on finned tube coils. The research should include a survey of existing similar
equipment. If needed, rewrite the specifications based on the conclusions of
the research. Consideration should be given to the following combinations based
on past experience of these materials in dealing with the local conditions.
1. Copper tube and aluminum fins, coated;
2. Copper tube and copper fins, coated;
3. Aluminum tube and aluminum fins, coated;
4. Aluminum tube and aluminum fins, uncoated;
5. Copper tube and copper fins, uncoated; and
6. Copper tube and aluminum fins, uncoated.
b. Coils: Constructed of seamless copper or aluminum tubing with copper or aluminum fins bonded
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.]
c. Outdoor Fans: Direct connected centrifugal type with aluminum or plastic wheel and forward
curved blades or direct connected aluminum propeller type. Design fans so that condensate will
evaporate without drip, splash, or spray on building exterior.
d. Indoor Fans: Direct connected centrifugal type with aluminum, galvanized steel, or plastic
wheel and forward curved blades. Provide minimum two-speed motor with built-in overload protection.
2.2.9 Ventilation Damper Assembly
NOTE: Delete requirement for ventilation damper when outside air is supplied
to the space by a central system.
Operated by automatic actuator. 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.
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 at least have positions for off, high
or low fan speed for [heating] [and] [cooling], and fan only operation. [Provide remote mounted night set-back
thermostat.]
2.3 HEAT PUMPS, AIR TO AIR
NOTE: Equipment having a higher efficiency than required by ASHRAE 90.1 or
FS A-A-50502 shall be specified if shown to be life-cycle cost effective. The
Energy Policy Act of 2005 requires new buildings to use 30 percent less energy
than the ASHRAE 90.1 level.
NOTE: Refer to Military Handbook 1190, "Facility Planning and Design Guide,"
for restrictions on heat pump usage. Select the appropriate Type and Class
from the latest edition of FS A-A-50502.
FS A-A-50502, except as modified in this article; Type [_____], Class [_____]. List units with capacities smaller
than 39,555 watt 135,000 Btu/hr in the [AHRI DCUP]; in lieu of listing in the ARI Directory, a letter of certification
from ARI that the units have been certified and will be listed in the next Directory will be acceptable. Provide
factory assembled units complete with accessories, wiring, piping, and controls. Provide units with [outlet grilles.]
[supplemental electric heaters.] [humidifiers.] [air filters as specified in the paragraph entitled "Filters."]
2.3.1 Energy Performance
NOTE: FEMP recommends 12.0 SEER and 7.7 HSPF for small (less than 65 MBtu/hr)
air-cooled heat pumps; 10.1 EER, 10.4 IPLV, and 3.2 COP for medium (65-135 MBtu/hr)
air-cooled heat pumps; and 9.3 EER, 9.5 IPLV, and 3.1 COP for large (136-240
MBtu/hr) air-cooled heat pumps. Heat pumps with a SEER of 14.0 are readily
available.
[Energy performance shall be in accordance with FS A-A-50502. ][Minimum energy efficiency shall be in accordance
with ASHRAE 90.1 - SI ASHRAE 90.1 -
IP.][Heat pumps shall have [a minimum [seasonal] energy efficiency ratio ([S]EER) of [_____],] [a minimum Heating
Seasonal Performance Factor (HSPF) of [_____],] [a minimum Integrated Part Load Value (IPLV) of [_____],] and
[a minimum COP of [_____].]]
2.3.2 Air Coils
NOTE: Research project location conditions to determine the environmental effects
on finned tube coils. The research should include a survey of existing similar
equipment. If needed, rewrite the specifications based on the conclusions of
the research. Consideration should be given to the following combinations based
on past experience of these materials in dealing with the local conditions.
1. Copper tube and aluminum fins, coated;
2. Copper tube and copper fins, coated;
3. Aluminum tube and aluminum fins, coated;
4. Aluminum tube and aluminum fins, uncoated;
5. Copper tube and copper fins, uncoated; and
6. Copper tube and aluminum fins, uncoated.
Extended-surface fin and tube type with seamless copper or aluminum tubes with copper or aluminum fins securely
bonded to the tubes. On coils with all-aluminum construction, provide tubes of aluminum alloy 1100, 1200, or
3102; provide fins of aluminum alloy 7072; and provide tube sheets of aluminum alloy 7072 or 5052. [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 Supplemental Electric Heaters
NOTE: Determine if supplemental electric heaters are required.
Provide electrical resistance heaters [integral with the unit] [for remote installation in ductwork]. Heaters
shall have a total capacity as indicated. Provide internal fusing for heaters.
2.3.4 Compressors
For compressors above 70 kW 20 tons, compressor speed shall not exceed 3450 rpm. For equipment over 35 kW 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.
2.3.5 Mounting Provisions
Provide units that permit mounting as indicated. [Provide suitable lifting attachment plates to enable equipment
to be lifted to normal position.]
2.3.6 Temperature Controls
NOTE: This is an example temperature controls paragraph for a simple air-source
heat pump system. Modify it, or add to it, to suit the requirements of the actual
system as designed. For complex, systems write a temperature controls paragraph
as required.
Provide controls as specified in FS 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 FS 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.
2.3.7 Accessories
In addition to accessories specified in FS A-A-50502, provide the following accessories for heat pump units.
a. Protective grille around outside unit coils
[b. Start capacitor kit]
2.4 AIR CONDITIONERS
NOTE: Select the appropriate Type, Style, and Class from the latest edition
of FS OO-A-373 or FS OO-A-374.
NOTE: Equipment having a higher efficiency than required by ASHRAE 90.1 or
FS A-A-50502 shall be specified if shown to be life-cycle cost effective. The
Energy Policy Act of 2005 requires new buildings to use 30 percent less energy
than the ASHRAE 90.1 level.
NOTE: For units 39,555 watt 135,000 Btu/hrand larger, include bracketed sentence
concerning liquid subcooling.
2.4.1 Single Package Type
NOTE: FEMP recommends a SEER of 12.0 for air conditioners smaller than 65 MBtu/hr,
an EER of 11.0 and IPLV of 11.4 for 65 to 135 MBtu/hr air conditioners, and
an EER of 10.8 and IPLV of 11.2 for 135 to 240 MBtu/hr air conditioners. Air
conditioners with a SEER of 14.0 are readily available.
FS OO-A-373, except as modified herein; Type [_____], Style [_____], Class [_____]. 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] [combination heating and
cooling] units. Provide units suitable for [indoor] [outdoor] [roof top] installation. [Provide units with
suitable lifting attachments, [remote control panel] [roof curb and flashing], [and] [transition plenums].]
[Minimum energy efficiency shall be in accordance with ASHRAE 90.1 - SI ASHRAE 90.1 - IP, at a minimum.] [Units
shall have a minimum [SEER of [_____]] [EER of [_____]] [IPLV of [_____]] when tested in accordance with AHRI 210/240
or AHRI 340/360 as applicable.] List units with capacities smaller than 39,555 watt 135,000 Btu/hr in the AHRI DCUP
; in lieu of listing in the ARI Directory, a letter of certification from ARI that the units have been certified
and will be listed in the next Directory will be acceptable. Provide capacity, electrical characteristics, and
operating conditions as indicated. [Condensers shall provide not less than minus 12 degrees C 10 degrees F liquid
subcooling at standard ratings.]
2.4.2 Split-System Type
NOTE: FEMP recommends a SEER of 12.0 for air conditioners smaller than 65 MBtu/hr,
an EER of 11.0 and IPLV of 11.4 for 65 to 135 MBtu/hr air conditioners, and
an EER of 10.8 and IPLV of 11.2 for 135 to 240 MBtu/hr air conditioners.
FS OO-A-374, except as modified herein; Type [_____], Style [_____], Class [_____]. 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 - SI ASHRAE 90.1 - IP
, at a minimum.] [Units shall have a minimum [SEER] [EER] of [_____] when tested in accordance with AHRI 210/240
or AHRI 340/360 as applicable.] List units with capacities smaller than 135,000 Btu/hr in the AHRI DCUP; in
lieu of listing in the ARI Directory, a letter of certification from ARI that units have been certified and will
be listed in the next Directory will be acceptable. 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
NOTE: In high humidity areas, use draw-thru type in order to utilize the fan
energy for reheat.
Provide single zone type units arranged to [draw] [or] [blow] through coil sections. [Air may be blown or drawn
through heating section.]
2.4.4 Multizone Units
Provide multizone type units arranged to [blow through the cooling and heating sections] [draw through the cooling
and heating sections] [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] [a separate unit for installation in the duct work].
Provide [steam coils] [hot water coils] [gas heaters] [oil heaters] [electric open coils] [electric strip tubular
heaters] [electric fin tubular heaters].
2.4.6 Compressors
For compressors over 70 kW 20 tons, compressor speed shall not exceed 3450 rpm. For systems over 35 kW 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 70 kW 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
NOTE: Research project location conditions to determine the environmental effects
on finned tube coils. The research should include a survey of existing similar
equipment. If needed, rewrite the specifications based on the conclusions of
the research. Consideration should be given to the following combinations based
on past experience of these materials in dealing with the local conditions.
1. Copper tube and aluminum fins, coated;
2. Copper tube and copper fins, coated;
3. Aluminum tube and aluminum fins, coated;
4. Aluminum tube and aluminum fins, uncoated;
5. Copper tube and copper fins, uncoated; and
6. Copper tube and aluminum fins, uncoated.
On coils with all-aluminum construction, provide tubes of aluminum alloy 1100, 1200, or 3102; provide fins of
aluminum alloy 7072; and provide tube sheets of aluminum alloy 7072 or 5052. 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
NOTE: Insert minimum temperature at which the mechanical cooling equipment
will be required to operate.
Provide start-up and head pressure controls to allow for system operation at ambient temperatures down to [_____]
degrees C degrees F.
2.4.9 Fans
Provide belt-driven evaporator fans with adjustable pitch pulleys; except for units less than 17 1/2 kW 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 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
NOTE: Typical specifications for a simple system with both single-stage cooling
and single-stage heating. Modify as required to suit the 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 0.83 degrees C 1.5 degrees Fdifferential and of suitable range calibrated in degrees
C 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.
2.5 FILTERS
NOTE: MERV 13 filters are typically at least 152 mm6 inches deep with 0.8 inch
wg pressure drop or higher, making them only feasible in applied, belt-driven
central station air handling units. Terminal equipment or smaller packaged
rooftop equipment cannot achieve this level of filtration or generate the static
pressure needed to deliver proper airflow when using this high efficiency filtration.
Typically MERV 6 or 8 is the highest efficiency filter that can be applied for
that equipment.
NOTE: Use of biobased materials that are rapidly renewable contributes to the
following LEED credit: MR6. Coordinate with Section 01 33 29 LEED(tm) DOCUMENTATION.
Provide filters to filter outside air and return air and locate [as indicated] [inside air conditioners] [inside
filter box] [inside combination air filter mixing box]. Provide [replaceable (throw-away)] [high efficiency]
[cleanable (reusable)] type. Filters shall conform to UL 900, [Class 1] [or] [Class 2]. Polyurethane filters
shall not be used on units with multiframe filters.[ Filters shall contain a minimum of [85][95][_____] percent
biobased material like cotton.]
2.5.1 Replaceable Type Filters
ASTM F 1040 throw-away frames and media, standard dust holding capacity, 1.79 m/s 350 fpm maximum face velocity,
and [25 mm one inch] [50 mm 2 inches] thick. Filters shall have a minimum efficiency reporting value (MERV)
of [6][8][_____] 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 [_____] Pa inches of watergage. Precede
high efficiency filters with a UL Class 2 replaceable type filter.
2.5.3 Cleanable Type Filters
ASTM F 872, Type II, UL Class 2. Provide sufficient oil to coat filters six times based on one pint of oil per
each 0.93 square meter 10 square feet of filter area. Provide washing and charging tanks for cleaning and coating
filters. Filters shall have a MERV of [6][8][_____] when tested in accordance with ASHRAE 52.2.
2.5.4 Manometers
NOTE: Prohibit the use of mercury as the operating fluid when air handling
units are to be in areas designated as "mercury-free."
Provide inclined-type manometers for filter stations of 944 L/s 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 250 Pa 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
NOTE: Include this article when coating of finned tube coils is required by
the equipment specifications paragraph.
NOTE: Research project location conditions to determine the environmental effects
on finned tube coils. The research should include a survey of existing similar
equipment. If needed, rewrite the specifications based on the conclusions of
the research. Consideration should be given to the following combinations based
on past experience of these materials in dealing with the local conditions.
1. Copper tube and aluminum fins, coated;
2. Copper tube and copper fins, coated;
3. Aluminum tube and aluminum fins, coated;
4. Aluminum tube and aluminum fins, uncoated;
5. Copper tube and copper fins, uncoated; and
6. Copper tube and aluminum fins, uncoated.
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 0.064 to 0.076 mm 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 coatings shall conform to MIL-DTL-5541, Class 1A. Cure conversion coating at a
temperature of 43 to 60 degrees C 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 0.025 mm 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 0.064 to 0.076 mm 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 46 to plus
104 degrees C 50 to plus 220 degrees F, and protect against atmospheres of a pH range of 1 to 14.
2.6.3 Vinyl Coating
NOTE: Include the paragraph below only in PACNAVFACENGCOM projects.
Apply coating using an airless fog nozzle. For each coat, make at least two passes with the nozzle. Materials
to be applied are as follows:
Total dry film thickness, 0.165 mm 6.5 mils maximum.
Vinyl Primer, 24 percent solids by volume: One coat 0.051 mm 2 mils thick
Vinyl Copolymer, 30 percent solids by volume: One coat 0.114 mm 4.5 mils thick.
2.7 MOTORS AND STARTERS
NOTE: Reduced voltage starters should be specified when voltage-regulation
problems are anticipated including inadequate power supply, poor distribution
facilities, and presence of electrical or electronic equipment sensitive to
voltage fluctuation.
NEMA MG 1, NEMA ICS 1, and NEMA ICS 2. Variable speed. Motors less than 3/4 kW 1 hp shall meet NEMA High Efficiency
requirements. Motors 3/4 kW 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 reduced voltage type motor starters.] Provide [general-purpose] [weather-resistant] [watertight] [explosion
proof] type starter enclosures in accordance with NEMA ICS 6.
2.8 REFRIGERANT PIPING AND ACCESSORIES
NOTE: Include and edit this paragraph when refrigerant piping is not included
in other project specifications.
Provide accessories as specified in [FS OO-A-373] [FS OO-A-374] [FS 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 B 280, factory dehydrated and
furnished with a balanced charge of refrigerant recommended by manufacturer of equipment being connected. Factory
insulate suction line tubing with 9.52 mm 3/8 inchminimum thickness of closed cell, foamed plastic conforming
to ASTM C 534/C 534M 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 ASHRAE 15 & 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 B 88M ASTM B 88, except that tubing with outside diameters of 6.35 mm 1/4 inch and 9.52 mm
3/8 inch shall have nominal wall thickness of not less than 7.62 mm 0.030 inch and 0.81 mm 0.032 inch, respectively.
Soft annealed copper tubing conforming to ASTM B 280 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, Type [_____], 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 6.35 mm 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 80 mm 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 4.39 kg per square meter 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 A 123/A 123M] [ASTM A 653/A 653M]&\, 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.
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 B 117. 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 D 1654. Upon completion of exposure, evaluate and rate the coating or paint system in accordance
with procedures A and B of ASTM D 1654. Rating of failure at the scribe mark shall not be less than six, average
creepage not greater than 3.18 mm 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 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.
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. Do not install valves in risers.
3.2.4 Refrigerant Driers, Sight Glass Indicators, and Strainers
Provide refrigerant driers, sight glass liquid indicators, and strainers in refrigerant piping in accordance
with [FS OO-A-373] [FS OO-A-374] [FS A-A-50502] when not furnished by the manufacturer as part of the equipment.
Install driers in liquid line with service valves and valved bypass line the same size as liquid line in which
dryer is installed. Size of driers shall be determined by piping and installation of the unit on location.
Install dryers of 820 mL 50 cubic inches and larger vertically with the cover for removing cartridge at the bottom.
Install moisture indicators in the liquid line downstream of the drier. Indicator connections shall be the same
size as the liquid line in which it is installed.
3.2.5 Strainer Locations and Installation
Locate strainers close to equipment they are to protect. Provide a strainer in common refrigerant liquid supply
to two or more thermal valves in parallel when each thermal valve has a built-in strainer. Install strainers
with screen down and in direction of flow as indicated on strainer's body.
3.2.6 Solenoid Valve Installation
Install solenoid valves in horizontal lines with stem vertical and with flow in direction indicated on valve.
If not incorporated as integral part of the valve, provide a strainer upstream of the solenoid valve. Provide
service valves upstream of the solenoid valve, upstream of the strainer, and downstream of the solenoid valve.
Remove the internal parts of the solenoid valve when brazing the valve.
3.3 AUXILIARY DRAIN PANS, DRAIN CONNECTIONS, AND DRAIN LINES
Provide auxiliary drain pans under units located above finished ceilings or over mechanical or electrical equipment
where condensate overflow will cause damage to ceilings, piping, and equipment below. Provide separate drain
lines for the unit drain and auxiliary drain pans. Trap drain pans from the bottom to ensure complete pan drainage.
Provide drain lines full size of drain opening. Traps and piping to drainage disposal points shall conform to
Section 22 00 00 PLUMBING SYSTEMS.
3.4 ACCESS PANELS
Provide access panels for concealed valves, controls, dampers, and other fittings requiring inspection and maintenance.
3.5 AIR FILTERS
Allow access space for servicing filters. Install filters with suitable sealing to prevent bypassing of air.
3.6 FLASHING AND PITCH POCKETS
NOTE: Show details of flashings and pitch pockets on drawings.
Provide flashing and pitch pockets for equipment supports and roof penetrations and flashing where piping or
ductwork passes through exterior walls in accordance with Section 07 60 00 FLASHING AND SHEET METAL.
3.7 IDENTIFICATION TAGS AND PLATES
Provide equipment, gages, thermometers, valves, and controllers with tags numbered and stamped for their use.
Provide plates and tags of brass or
suitable nonferrous material, securely mounted or attached. Provide minimum letter and numeral size of 3.18
mm 1/8 inch high.
3.8 FIELD QUALITY CONTROL
3.8.1 Leak Testing
Upon completion of installation of air conditioning equipment, test factory- and field-installed refrigerant
piping with an electronic-type leak detector. Use same type of refrigerant to be provided in the system for
leak testing. When nitrogen is used to boost system pressure for testing, ensure that it is eliminated from
the system before charging. Minimum refrigerant leak field test pressure shall be as specified in ASHRAE 15 & 34
, except that test pressure shall not exceed 1034 kPa (gage) 150 psig on hermetic compressors unless otherwise
specified as a low side test pressure on the equipment nameplate. If leaks are detected at time of installation
or during warranty period, remove the entire refrigerant charge from the system, correct leaks, and retest system.
3.8.2 Evacuation, Dehydration, and Charging
After field charged refrigerant system is found to be without leaks or after leaks have been repaired on field-charged
and factory-charged systems, evacuate the system using a reliable gage and a vacuum pump capable of pulling a
vacuum of at least 133 Pa one mm Hg absolute. Evacuate system in accordance with the triple-evacuation and blotter
method or in accordance with equipment manufacturer's printed instructions and recharge system.
3.8.3 Start-Up and Initial Operational Tests
Test the air conditioning systems and systems components for proper operation. Adjust safety and automatic control
instruments as necessary to ensure proper operation and sequence. Conduct operational tests for not less than
8 hours.
3.8.4 Performance Tests
NOTE: List the readings desired for a particular system if not covered by Section
15950, "HVAC Testing/Adjusting/Balancing."
Upon completion of evacuation, charging, startup, final leak testing, and proper adjustment of controls, test
the systems to demonstrate compliance with performance and capacity requirements. Test systems for not less
than 8 hours, record readings hourly. At the end of the test period, average the readings, and the average shall
be considered to be the system performance. Record the following readings:
[_____]
[_____]
3.9 WASTE MANAGEMENT
NOTE: Diverting waste from the landfill contributes to the following LEED credit:
MR2. Coordinate with Section 01572 CONSTRUCTION AND DEMOLITION WASTE MANAGEMENT.
Separate waste in accordance with the Waste Management Plan, placing copper materials in designated areas for
reuse. Close and seal tightly all partly used adhesives and solvents; store protected in a well-ventilated,
fire-safe area at moderate temperature.
3.10 SCHEDULE
Some metric measurements in this section are based on mathematical conversion of inch-pound measurements, and
not on metric measurements commonly agreed on by the manufacturers or other parties. The inch-pound and metric
measurements shown are as follows:
Products Inch-Pound Metric
a. [_____ _____ _____]