Part 5 - 23 73 33.pdf

Fire Station Repairs Work Order Number 19-0167 Camp Lejeune, North Carolina

SECTION 23 73 33

HEATING, VENTILATING, AND COOLING SYSTEM

01/07

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 in the text by the basic designation only.

AIR MOVEMENT AND CONTROL ASSOCIATION INTERNATIONAL, INC. (AMCA)

AMCA 210 (2016) Laboratory Methods of Testing Fans for Aerodynamic Performance Rating

AMCA 500 (1994) Test Methods for Louvers, Dampers and Shutters

AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI)

ANSI/AHRI 210/240 (2008; Add 1 2011; Add 2 2012) Performance Rating of Unitary Air-Conditioning & Air-Source Heat Pump Equipment

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI Z21.22 (1999; 2001) Relief Valves for Hot Water Supply Systems

ANSI Z83.8/CSA 2.6 (2013 American National Standard/CSA Standard for Gas Unit Heater, Gas Packaged Heaters, Gas Utility Heaters and Gas-Fired Duct Furnaces

AIR-CONDITIONING , HEATING AND REFRIGERATION INSTITUTE (A HRI)

ARI UD Directory of Certified Unitary Air Conditioning Equipment

ARI 210/240 (1994) Unitary Air-Conditioning and Air-Source Heat Pump Equipment

ARI 340/360 (2000) Commercial and Industrial Unitary Air-Conditioning and Heat Pump Equipment

ARI 7l0 (1995) Liquid-Line Driers

SECTION 23 73 33 Page 1

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING

ENGINEERS (ASHRAE)

ASHRAE 15 (2001) Safety Standard for Mechanical Refrigeration System

ASME INTERNATIONAL (ASME)

ASME B16.3 (2016) Malleable Iron Threaded Fittings, Classes 150 and 300

ASME B16.5 (2017) Pipe Flanges and Flanged Fittings NPS 1/2 Through NPS 24 Metric/Inch Standard

ASME B16.9 (2001) Factory-Made Wrought Steel Buttwelding Fittings

ASME B16.11 (2016) Forged Fittings, Socket-Welding and Threaded

ASME B16.18 (2001) Cast Copper Alloy Solder Joint Pressure Fittings

ASME/ANSI B16.22 (1995) Wrought Copper and Copper Alloy Solder Joint Pressure Fittings

ASME B16.23 (1992) Cast Copper Alloy Solder Joint Drainage Fittings - DWV

ASME/ANSI B16.26 (1988) Cast Copper Alloy Fittings for Flared Copper Tubes

ASME/ANSI B16.39 (1998) Malleable Iron Threaded Pipe Unions

ASME B31.1 (2016; Errata 2016) Power Piping

ASME/ANSI B31.5 (2001) Refrigeration Piping and Heat Transfer Components

AMERICAN SOCIETY OF SANITARY ENGINEERING (ASSE)

ASSE 1003 (2001) Water Pressure Reducing Valves

ASTM INTERNATIONAL (ASTM)

ASTM A53/A53M (2018) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A106 (1999el) Seamless Carbon Steel Pipe for High-Temperature Service

ASTM A193/A193M (2017) Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service and Other Special Purpose Applications

ASTM A194/A194M (2018) Standard Specification for Carbon Steel, Alloy Steel, and Stainless Steel

SECTION 23 73 33 Page 2

Nuts for Bolts for High-Pressure or High-Temperature Service, or Both

ASTM A525 (1991; Rev. B) Steel Sheet, Zinc-Coated (Galvanized) by the Hot-Dip Process

ASTM A653/A653M (2018) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM B32 (2008; R 2014) Standard Specification for Solder Metal

ASTM B42 (1998) Seamless Copper Pipe, Standard Sizes

ASTM B88 (2016) Standard Specification for Seamless Copper Water Tube

ASTM B280 (1999el) Seamless Copper Tube for Air Conditioning and Refrigeration Field Service

ASTM B306 (1999) Copper Drainage Tube (DWV)

U.S. DEPARTMENT OF ENERGY (DOE)

Energy Star (1992; R 2006) Energy Star Energy Efficiency Labeling System (FEMP)

FOUNDATION FOR CROSS-CONNECTION CONTROL AND HYDRAULIC RESEARCH

(FCCCHR)

FCCCHR-USC (2002) List of Approved Backflow Prevention Assemblies

MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS

INDUSTRY (MSS)

MSS SP-58 (2009) Pipe Hangers and Supports - Materials, Design and Manufacture, Selection, Application, and Installation

MSS SP-67 (2002) Butterfly Valves

MSS SP-69 (2003; Notice 2012) Pipe Hangers and Supports - Selection and Application (ANSI Approved American National Standard)

MSS SP-70 (1998) Cast Iron Gate Valves, Flanged and Threaded Ends

MSS SP-71 (1997) Cast Iron Swing Check Valves, Flanged and Threaded Ends

MSS SP-80 (1997) Bronze Gate, Globe, Angle and Check Valves

MSS SP-85 (1994) Cast Iron Globe & Angle Valves

SECTION 23 73 33 Page 3

Flanged and Threaded Ends

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2017; ERTA 1-2 2017; TIA 17-1; TIA 17-2;

TIA 17-3; TIA 17-4; TIA 17-5; TIA 17-6;

TIA 17-7; TIA 17-8; TIA 17-9; TIA 17-10;

TIA 17-11; TIA 17-12; TIA 17-13; TIA

17-14; TIA 17-15; TIA 17-16; TIA 17-17 )

National Electrical Code

NFPA 90A (1999) Installation of Air Conditioning and Ventilating Systems

NATIONAL ROOFING CONTRACTORS ASSOCIATION (NRCA)

NRCA R&W Manual (2001, 5th Ed) NRCA Roofing and Waterproofing Manual

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION

(SMACNA)

SMACNA HVAC Duct Const Stds (1995; Addenda Nov 1997; 6th Printing 2001) HVAC Duct Construction Standards - Metal and Flexible

SMACNA Leakage Test Mn1 (1985; 6th Printing 1997) HVAC Air Duct Leakage Test Manual

UNDERWRITERS LABORATORIES (UL)

UL Bld Mat Dir (1999) Building Materials Directory

UL 181 (1996; Rev Dec 1998) Factory-Made Air Ducts and Air Connectors

UL 507 (1999; Rev thru Sep 2001) Electric Fans

UL 555 (1999; Rev thru Jan 2002) Fire Dampers

UL 1025 (1980; R 1990, Bul. 1991) Electric Air Heaters

1.2 SYSTEM DESCRIPTION

Provide new heating, ventilating, and cooling (HVAC) systems complete and ready for operation. HVAC systems include equipment, ducts, and piping which is located within, on, under, and adjacent to buildings.

1.3 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for Contractor Quality Control approval. Submittals with an "S" are for inclusion in the Sustainability eNotebook, in conformance to Section 01 33 29.05 20 SUSTAINABILITY REPORTING FOR DESIGN-BUILD. Submit the following in accordance with Section 01 33 00.05 20 CONSTRUCTION SUBMITTAL PROCEDURES:

SECTION 23 73 33 Page 4

SD-03 Product Data

Split-system heat pumps ; G

Energy Star Label for Heat Pump Product ; S

Exhaust fans

Fire dampers

Expansion tanks

Heat tape

Pipe hangers and supports

Flexible pipe connectors

Dampers

Diffusers, registers, and grilles

Outside air intake louvers

Flexible round ducts

Valves

Indoor Air Quality for Duct Sealants ; S

Pipe and fittings

Dedicated Outside Air Systems ; G

Mini-Split Heat Pump Systems ; G

Gas-Fired Unit Heater ; G

Electric Unit Heaters

Air Separation And Sediment Removal Tanks

SD-06 Test Reports

Dedicated Outside Air Systems ; G

SD-08 Manufacturer's Instructions

Installation manual

SD-10 Operation and Maintenance Data

Dedicated Outside Air Systems ; G, Data Package 3

Mini-Split Heat Pump Systems , Data Package 3

Split-system heat pumps , Data Package 3

SECTION 23 73 33 Page 5

Electric Unit heaters , Data Package 2

Exhaust fans , Data Package 2

Fire dampers , Data Package 1

Submit in accordance with Section 01 78 00, " Closeout Submittals ."

SD-11 Closeout Submittals

Dedicated Outside Air Systems ; G

Air filter inventory

Indoor Air Quality During Construction ; S

1.3.1 Installation Manual

Provide for each item of equipment.

1.3.2 Air Filter Inventory

Submit an inventory of sizes and quantity of air filters required to be replaced. Inventory shall indicate location of each piece of equipment.

Include sketches of drawings.

PART 2 PRODUCTS

2.1 EQUIPMENT

Dehydrate, purge, and charge refrigerant circuit with refrigerant and oil at factory. Factory oil and refrigerant charge shall be full amount required for operation, if within limits permitted by the Department of Transportation; otherwise, a holding charge shall be furnished. Field charging, where only a holding charge is shipped, shall be accomplished without breaking permanent refrigerant connections. Equipment using R-11, R-12, R-13, R-113, R-114, R-115, R-500, or R-502 as a refrigerant will not be permitted. 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 Program. Refrigerants that operate any where in the cycle below 20 psia will not be permitted. Efficiency of equipment shall meet the minimum's of Table 15701-1.

2.1.1 Dedicated Outside Air Systems (Interior - Small Capacity)

2.1.1.1 Cabinet

a. Cabinet shall be unpainted, non-weatherized and constructed of scratch resistant heavy duty galvanized G90 steel.

b. Cabinet access panels shall fit into recessed pockets within the cabinet structure and held in place with screws or tool-operated quick-turn fasteners. Recessed areas will be lined with flexible gasket to minimize air leakage. Some access panels shall have inserts to easily facilitate panel removal. Service panels for

SECTION 23 73 33 Page 6 filter maintenance are hinged for ease of service.

c. Panels shall allow side access to key internal components to facilitate installation, maintenance and servicing of the unit.

The front end panel will be hinged to allow for ease of access.

d. Duct flanges shall be factory-installed prior to shipment for side supply and exhaust/return air configurations. This side panel is field reversible and duct flanges and panel gasket must be moved for opposite side supply and exhaust/return air configuration

e. The back of the cabinet shall have an inlet and outlet for outside air intake and exhaust air discharge. The cabinet shall be suitable for installation adjacent to an exterior wall or interior space within the building.

f. Double Wall with Solid Liner - Cabinet and removable panels shall be double-wall construction with interior panels consisting of solid galvanized metal.

2.1.1.2 Enthalpy Wheel

a. The system shall utilize a total enthalpy wheel to capture waste heat energy from the building exhaust air stream for conditioning of the entering outdoor air stream. The energy recovery component shall incorporate a rotary wheel in an insulated cassette frame complete with seals, drive motor and drive belt. The wheel shall not allow more than 5% crossover between the supply and exhaust air stream. The total energy recovery wheel shall be coated with silica gel desiccant permanently bonded without the use of binders or adhesives, which may degrade desiccant performance. The substrate shall be lightweight polymer and shall not degrade nor require additional coatings for application in marine or coastal environments. Coated segments shall be washable with detergent or alkaline coil cleaner and water. Desiccant shall not dissolve nor deliquesce in the presence of water or high humidity. The wheel shall be wound continuously with one flat and one structured layer in an ideal parallel plate geometry providing laminar flow and minimum pressure drop-to-efficiency ratios. The layers shall be effectively captured in stainless steel wheel frames or aluminum and stainless steel segment frames that provide a rigid and self-supporting matrix. The wheels shall be provided with removable energy transfer matrix. Wheel frame construction shall be a welded hub, spoke and rim assembly of stainless, plated and/or coated steel and shall be self-supporting without matrix segments in place. Segments shall be removable without the use of tools to facilitate maintenance and cleaning. Wheel bearings shall be selected to provide an L-10 life in excess of 400,000 hours.

Rim shall be continuous rolled stainless steel and the wheel shall be connected to the shaft by means of taper locks. All diameter and perimeter seals shall be provided as part of the cassette assembly and shall be factory set. Drive belts of stretch urethane shall be provided for wheel rim drive without the need for external tensioners or adjustment.

2.1.1.3 Plate Heat Exchanger

a. The plate heat exchanger will have a maximum temperature of 190°F.

The plate heat exchanger shall have a maximum leakage of 0.1% at

SECTION 23 73 33 Page 7 nominal air flow with non-silicone sealant at 400 Pa WC differential pressure. The plate material shall be aluminum. The frame material corner profiles shall be aluminum or aluzinc.

2.1.1.4 Refrigerant Circuit

a. Refrigerant circuit shall be provided with high and low-side Schrader access valves, sight glass with integral moisture indicator, filter-drier, maximum operating pressure (MOP) expansion valve with external equalizer line, expansion valve with internal equalizer line, manual reset high and auto-reset low pressure safety switches.

b. Refrigerant circuit will be factory leak tested, evacuated, and charged with R-410A refrigerant and run tested prior to shipment.

c. Units shall contain a 1-row auxiliary/reheat coil and a receiver tank for refrigerant management. The auxiliary/reheat coil shall be constructed of copper tubing mechanically expanded into aluminum fins. The fin spacing shall be 13 fins per inch. The auxiliary/reheat coil shall be vertically mounted a minimum of 8" after the evaporator coil for ease of cleaning and to prevent re-hydration of the condensate from the evaporator coil.

d. Compressor section is to be provided with resealable refrigerant fittings in order to allow for compressor change at the ceiling level requiring no recovery of refrigerant, brazing, and evacuation or charging of the unit using a factory compressor retrofit kit.

e. Heat Pump Cycle unit will be equipped with a solenoid valve operating a 4 way valve. In addition the refrigeration circuit will shall contain a suction accumulator.

2.1.1.5 Compressor

a. Refrigerant circuit (.75 ton) shall utilize a single reciprocating compressor. Reciprocating compressors shall be mounted on vibration isolators to ensure quiet operation. Each reciprocating compressor shall be protected internally from overheating

b. Compressor shall be mounted outside the air stream in an insulated compartment.

c. Compressor circuit shall be protected with a high and low pressure safety switch.

2.1.1.6 Evaporator Coil Section

a. It shall be made with heavy wall seamless copper tubes mechanically expanded into tempered aluminum fins with drawn self-spacing collars. Coil end sheets shall be hot-dipped galvanized. Coils shall be 6 rows deep and 13 FPI for uniform performance and optimum part load and humidity operation. All coils shall be factory leak checked under pressure

b. A maximum operating pressure (MOP), adjustable thermostatic expansion valves, externally equalized, shall feed the evaporator coil.

SECTION 23 73 33 Page 8

c. Evaporator coil section shall be equipped with a double sloped 304 stainless steel drain pan with 3/4" NPT female connection condensate drain connection located on the side of the cabinet.

Drain pan shall extend to the entire length and width of the evaporator coil.

2.1.1.7 Condenser Coil Section

a. It shall be made with heavy wall seamless copper tubes mechanically expanded into tempered aluminum fins with drawn self-spacing collars. Coil end sheets shall be hot-dipped galvanized. Coils shall be 4 rows deep and 18 FPI for uniform performance and optimum part load and humidity operation. All coils shall be factory leak checked under pressure.

b. A maximum operating pressure (MOP), adjustable thermostatic expansion valve, internally equalized shall feed the evaporator coil.

c. Condenser coil section shall be equipped with a double sloped 304 stainless steel drain pan with 3/4" NPT female connection condensate drain connection located on the side of the cabinet.

Drain pan shall extend to the entire length and width of the condenser coil.

2.1.1.8 Blower / Motor Assemblies

a. Unit supply and exhaust fans shall consist of centrifugal backward curve fans with electronically commutated motors (ECM). The motor RPM shall be directly set by the package unit control system. The balancing contractor shall have direct access to set the motor RPM through the unit control system

b. Section shall include a factory-installed, fan motor fault proving switch. Upon loss of fan motor operation, this control shall enunciate.

2.1.1.9 Electrical System

a. Unit shall have a single isolated electrical control panel located out of the air stream. Access to the control panel shall be from the right or left side of the unit. A single point power connection shall be provided through the right or left side of the cabinet. Power shall be connected to factory installed terminal blocks. Ground lug shall be affixed in the control panel.

b. A low-voltage transformer, with protection, shall be provided to supply 24 VAC to the control circuit.

c. Terminal strips and blocks shall be factory installed internal to the control box and be clearly labeled for control wiring connections. External control wires shall enter the cabinet through the right or left side of the cabinet

d. Terminal blocks shall be factory provided for a Remote On / Off switch capability. Controls shall be suitably wired and enabled to accept a signal from a field supplied Remote On / Off switch.

SECTION 23 73 33 Page 9

e. Terminal blocks shall be factory provided for a Fire / Smoke Detector sensor interface. Controls shall be suitably wired and enabled to accept a signal from a Fire / Smoke Detector.

f. Terminal blocks shall be factory provided for an External Condensate Pump / Float Switch interface. Controls shall be suitably wired and enabled to accept a signal from an External Condensate Pump / Float Switch.

g. Unit shall contain a self-contained programmable thermostat.

2.1.1.10 Air Filtration

a. Filter rack shall be factory mounted in the unit cabinet and shall be accessible from either side.

b. Filters shall be nominal 2" depth pleated, MERV 8, throwaway type panel filters consisting of cotton and synthetic or synthetic only media with galvanized expanded metal backing and moisture resistant enclosing frame. The filter shall be classified for flammability by Underwriters Laboratories, Inc. as Class 2.

c. Filter face area shall contain not less than 10 pleats per lineal foot. Media support shall be heavy gauge expanded, electro-galvanized metal with grid members being no less than 0.025"wide, providing an open area of not less than 96%. The grid shall be 100% bonded to the media on the air exiting side to eliminate media vibration and pull-away. The grid shall be formed to provide a uniform V-shaped pleat with the open area on the air exiting matched to the open area on the air entering side for maximum utilization of the media and low airflow resistance. The enclosing frame shall be constructed of a rigid, high wet strength board.

2.1.1.11 Options

a. Baked Phenolic Coil Coating - Finned tube coil shall be protected with a pure Phenolic thermosetting resinous coating. Metal preparation to provide a surface profile degreasing and etching or phosphatizing by immersion. The coating shall be applied in multiple coats by immersion. After each coat immersion, the coating shall be partially cured in an oven. Following the final immersion and application of (1) spray coat, the coating shall be totally cured in an oven.

The total Dry Film Thickness of the coating shall be approximately 2 mils, thereby providing good protection without adversely affecting heat transfer. Dry Film Thickness varies depending upon fin spacing and the number of tubes and rows in depth. The coating shall withstand dry heat up to 205 °C (400 °F) and show no sign of attack after 3000 hours of salt spray test to A.S.T.M.

Specification B117.

2.1.2 Mini-Split Heat Pump Systems

Provide units factory assembled, designed, tested, and rated in accordance with ANSI/AHRI 210/240 . System shall consist of a slim silhouette, compact, wall mounted indoor fan coil section with wired remote controller and a slim silhouette horizontal discharge outdoor unit which shall be of

SECTION 23 73 33 Page 10 an inverter driven heat pump design. Provide proof of Energy Star Label for Heat Pump Product .

a. Outdoor Unit Cabinet: The casing shall be fabricated of galvanized steel, finished with an electrostatically applied, thermally fused acrylic or polyester powder coating in manufacturer's standard color. Assembly hardware shall be cadmium plated. Provide unit with two (2) steel mounting feet, traverse mounted across the cabinet base pan, welded mount, providing four

(4) slotted mounting holes. Assembly shall withstand lateral wind gust up to 155 MPH.

b. Outdoor Unit Fan: The unit shall be furnished with a direct drive, high performance propeller type fan. The condenser fan motor shall be a variable speed, direct current (DC) motor and shall have permanently lubricated bearings. Fan speed shall be switch automatically according to the number of operating indoor units and the compressor operating frequency. The fan motor shall be mounted with vibration isolation. The fan shall be provided with a raised guard to prevent contact with moving parts. The outdoor unit shall have horizontal discharge airflow.

c. Outdoor Unit Coil: The outdoor unit coil shall be of nonferrous construction with lanced or corrugated plate fins on copper tubing. The coil shall be protected with an integral guard.

Refrigerant flow from the outdoor unit to the indoor units shall be independently controlled by means of individual electronic linear expansion valves for each indoor unit. Outdoor unit shall be pre-charged with sufficient R-410a refrigerant for up to thirty three (33) feet of refrigerant piping. All refrigerant lines between outdoor and indoor units shall be of annealed, refrigeration grade copper tubing, ARC Type, meeting ASTM B280 requirements, individually insulated in twin-tube, flexible, closed-cell, CFC-free (ozone depletion potential of zero), elastomeric material for the insulation of refrigerant pipes and tubes with thermal conductivity equal to or better than 0.27 BTU-inch/hour per Sq Ft / °F, a water vapor transmission equal to or better than 0.08 Perm-inch and superior fire ratings such that insulation will not contribute significantly to fire and up to 1" thick insulation shall have a Flame-Spread Index of less than 25 and a Smoke-development Index of less than 50 as tested by ASTM E

84. All refrigerant connections between outdoor and indoor units shall be flare type.

d. Outdoor Unit Compressor: The compressor shall be a high performance, hermetic, inverter driven, variable speed, dual rotary type. The compressor motor shall be direct current (DC) type equipped with a factory supplied and installed inverter drive package. The outdoor unit shall be equipped with a suction side refrigerant accumulator. The compressor shall be equipped with an internal thermal overload. The outdoor unit must have the ability to operate over the full capacity range with a maximum height difference of 40 feet and have refrigerant tubing length of 65 feet. The compressor shall be mounted to avoid the transmission of vibration.

e. Outdoor Unit Electrical: The unit electrical power shall be voltage as indicated in schedule. The outdoor unit shall be controlled by the microprocessors located in the indoor unit and

SECTION 23 73 33 Page 11 in the outdoor unit communicating system status, operation, and instructions digitally over A-Control - a system directing that the indoor unit be powered directly from the outdoor unit using a 3-wire, 14 ga. AWG connection plus ground. The outdoor unit shall be equipped with Pulse Amplitude Modulation (PAM) compressor inverter drive control.

f. Indoor Unit Cabinet: The casing shall have a smooth front, white finish. Provide a separate, metal installation-plate that secures the indoor unit firmly to the wall. The installation-plate shall be securely attached to the wall using appropriate anchor method.

Installing contractor shall determine the best method and be responsible for proper mounting of the installation plate to the wall.

g. Indoor Unit Fan: The indoor unit fan shall be an assembly with a line-flow fan direct driven by a single motor. The fan shall be statically and dynamically balanced and be powered by a motor with permanently lubricated bearing. Manual adjustable guide vanes shall be provided with the ability to change the airflow from side to side (left to right).Provide an integral, motorized, multi-position, horizontal air sweep flow louver. Unit shall be capable of five (5) positions plus Auto and Swing, controlled from the remote controller. The indoor fan shall operate at one of four (4) speeds. All speeds shall be selected from the remote controller.

h. Indoor Unit Filter: Return air shall be filtered by means of washable filter.

i. Indoor Unit Coil: The indoor unit coil shall be of nonferrous construction with smooth plate fins on copper tubing. All tube joints shall be brazed with phoscopper or silver alloy. The coils shall be pressure tested at the factory. A sloped, corrosion resistant condensate pan with drain shall be provided under the coil. An drain pan level switch shall be provided and installed on the condensate pan to prevent condensate from overflowing.

j. Indoor Unit Electrical: The unit electrical power shall be voltage as indicated in schedule. The system shall be equipped with a system directing that the indoor unit be powered directly from the outdoor unit.

k. System Control: Provide indoor unit with a wired remote controller mounted where indicated on plans. The wired remote controller shall be approximately 5" x 5" in size and white in color with a LCD display.

2.1.3 Gas-Fired Unit Heater

ANSI Z83.8/CSA 2.6 and AGA label

2.1.3.1 Casing

Minimum 22 gage steel or aluminum. Provide removable access panels.

2.1.3.2 Heat Exchanger

Minimum 20 gage all-welded steel construction with corrosion-resistant aluminum finish.

SECTION 23 73 33 Page 12

2.1.3.3 Burners

Die-formed, slot ports, and steel construction with aluminum paint.

2.1.3.4 Draft Diverter

All-welded steel construction and an integral part of each heat exchanger section. Allows backdrafts to bypass burner assembly without affecting normal operation.

2.1.3.5 Controls

Consisting of a combination pressure regulator, main shutoff valve, pilot cock, pilot safety switch for 100 percent shutoff, high temperature limit switch, and time-delay fan switch. Include power and control connections in an integral junction box.

2.1.3.6 Venting

Indoor, separated combustion, power vented.

2.1.3.7 Efficiency

Minimum steady state efficiencies shall be 78 percent at maximum rated capacity and 75 percent at minimum rated capacity that is provided and allowed by the controls.

2.1.4 Split-System Heat Pumps

Provide units factory assembled, designed, tested, and rated in accordance with ARI 210/240 or ARI 340/360 . Units shall be ARI certified or rated in ARI UD . Outside unit shall include compressor and condenser. Provide guards to protect condenser fins. Unit shall include blower fan, evaporator coil, filters, and controls. Provide additional heating section when indicated. Insulate interior of inside unit casing with manufacturer's standard insulation. Insulate interior of inside unit casing with manufacturer's standard insulation.

a. Filter section: Provide UL listed throwaway 1 inch thick fiberglass filters, standard dust-holding capacity, 350 fpm maximum face velocity. Provide gasketed hinged access panel with quick opening half-twist latches at end of filter rack. Filter rack shall accept 2 inch thick filters.

b. Safety controls: Provide low refrigerant pressure protection and pressure relief device. Provide compressor motor with thermal and overload protection, 5 minute anti-recycle timer, and start capacitor kit. Provide compressor with electrical crankcase heater and internal high pressure protection. The above safety controls are not required when scroll compressors are provided.

d. Space temperature controls: Space temperature controls:

Provide controls under Section 23 09 23.13 , "BACnet DIRECT DIGITAL

CONTROL SYSTEMS FOR HVAC."

SECTION 23 73 33 Page 13

2.1.5 Electric Unit Heaters

UL 1025 ; wattage, voltage, phase, number of steps, Btu/hr and CFM as indicated. Provide control-circuit terminals and single source of power supply. Heaters 5 Kw and larger shall be 3-phase, with load balanced on each of the three phases. Limit leaving air temperature to 140 degrees F with entering air of 60 degrees F .

2.1.5.1 Enclosure

Minimum 20 gage steel.

2.1.5.2 Heating Element

Nickel chromium heating wire element, free from expansion noise and 60 Hz hum. Embed element in magnesium-oxide insulating refractory. Seal element in high-mass steel or corrosion-resisting metallic sheath with fins. Enclose element ends in terminal box. Provide not more than six fins per inch . Limit fin surface temperature 550 degrees F at any point during normal operation.

2.1.5.3 Controls

Include limit controls for overheat protection of heaters. For remote thermostatic operation, provide contactor rated for 100,000 duty cycles.

Provide a control transformer to supply 120-volt thermostat control circuit for each heater as required.

2.1.5.4 Wiring

Completely factory-prewired to terminal strips, ready to receive branch circuit and control connections for 140 degrees F copper wiring.

2.1.5.5 Thermostat

Provide tamper resistant integral thermostat, adjustable without requiring removal of heater components. Thermostat operating range shall be approximately 50 degrees F to a maximum of 75 degrees F with operating differential of 3 degrees F or less.

2.1.6 Exhaust Fans

AMCA 210 with AMCA seal. Provide centrifugal type exhaust fans with aluminum housing, fan wheel, and bird screen. Motors shall be completely shielded from the airstream. Provide exhaust opening and gravity closing type automatic backdraft dampers. Provide NRCA R&W Manual roof curb for roof mounted exhaust fans as recommended by fan manufacturer.

2.1.7 Bathroom Exhaust Fans

UL 507 and UL listed for ceiling installation, HVI (Home Ventilating Institute) certified, with AMCA seal. Unit shall be 2.5 zones or less at rated cfm and static pressure.

SECTION 23 73 33 Page 14

2.2 ELECTRICAL

2.2.1 Electrical Motors, Controllers, Contactors, and Disconnects

Furnish with respective pieces of equipment. Motors, controllers, contactors, and disconnects shall conform to Section 26 20 00 , "Interior Wiring Systems." Provide electrical connections under Section, 26 20 00 , "Interior Wiring Systems." Provide controllers and contactors with maximum of 120-volt control circuits, and auxiliary contacts for use with controls furnished. When motors and equipment furnished are larger than sizes indicated, the cost of providing additional electrical service and related work shall be included under this section.

2.2.2 Electrical Work

Provide under Section 26 20 00 , "Interior Wiring Systems." Provide control wiring under Section 23 09 23.13 , "BACnet DIRECT DIGITAL CONTROL

SYSTEMS FOR HVAC."

2.3 METAL DUCT SYSTEMS

Provide shop-fabricated, zinc-coated steel ducts conforming to ASTM A525 or ASTM A653/A653M coating designation G60. Fabricate, construct, brace, reinforce, install, support, and seal ducts and accessories, and test ducts in accordance with SMACNA HVAC Duct Const Stds and SMACNA Leakage Test Mn1 . Cover duct transverse joints with single component synthetic rubber type compound suitable for use with passivated coating on zinc-coated steel. Lap joints in direction of flow. Provide ducts straight and smooth on inside with neatly finished airtight joints.

Provide air supply and return openings in ducts with air diffusers, registers, or grilles. Provide validation of Indoor Air Quality for Duct Sealants .

2.3.1 Flexible Duct Connectors

Provide airtight flexible duct connectors at duct connections to each air-conditioning unit, air-handling unit, exhaust fan, and ventilating fan.

Support connectors at each end with metal angle frame bands, securely bolt in place. Provide not less than 20 ounce glass fabric duct connectors coated on both sides with neoprene.

2.3.2 Turning Vanes

Provide fabricated tees and square elbows with turning vanes in accordance with SMACNA HVAC Duct Const Stds for vanned elbows. Turning vanes shall be single wall with trailing edges.

2.3.3 Dampers

Provide factory manufactured opposed blade adjustable manual dampers where indicated for duct heights of 12 inches and larger. Provide factory manufactured single leaf dampers for duct heights less than 12 inches.

Provide damper shafts with 2 inch standoffs to clear 2 inches of duct insulation with bearings at both ends of the shafts. Provide adjustment quadrant with indicator and locking devices. Provide galvanized steel dampers one gage heavier than duct in which dampers are installed.

Provide automatic dampers under Section 23 09 23.13 , "BACnet Direct Digital Control Systems for HVAC."

SECTION 23 73 33 Page 15

2.3.4 Diffusers, Registers, and Grilles

Provide factory-fabricated metal units with edges rolled or rounded where exposed to view, and factory primed with white enamel finish. Provide each diffuser and register with factory-fabricated, group-operated, adjustable, opposed-blade, air-volume-control dampers, key or screwdriver operated from the face of unit without the use of a tool. Provide each unit with rubber or plastic installation gaskets. Diffusers in same room shall have same face design.

a. Diffusers: Provide round, square, or rectangular diffusers as indicated. Ceiling diffusers shall be designed to deliver air in a horizontal direction. Provide baffles or other devices as required for proper air distribution pattern.

b. Registers: Provide double deflection supply registers arranged to control air direction, throw, and drop. Exhaust and return air registers shall have single set of nondirectional face bars or vanes having the same appearance as supply registers. Provide face bars or vanes spaced not more than 0.75 inch on center and not less than 0.62 inch depth.

c. Grilles: Provide as specified for registers without air-volume-control dampers.

2.3.5 Outside Air Intake Louvers

Louvers shall bear AMCA certified ratings program seal for air performance and water penetration in accordance with AMCA 500. Maximum pressure drop shall be 0.1 inch WG, unless indicated otherwise. Louvers shall have maximum water penetration of 0.20 ounce per square foot of free area at free velocity of 800 fpm. Provide aluminum alloy with anodized finish frames and blades assembled with stainless steel screws, including 0.5-inch mesh aluminum screen mounted in extruded aluminum frame.

2.3.6 Access Doors

Provide for access to volume dampers, fire dampers, plenum chambers, and where indicated. Provide each door with double wall zinc-coated steel construction, gasketed airtight, with continuous hinges and cam latches.

Insulate access doors with one-inch thick rigid insulation. Provide 12 inch by 12 inch door, except where larger sizes are indicated, or provide 12 inches by height of duct when duct is less than 12 inches high.

2.3.7 Fire Dampers

UL 555 and NFPA 90A. Dampers shall be listed in UL Bld Mat Dir . Dampers when open shall not protrude into the ducts.

2.3.8 Flexible Round Ducts

UL 181 and NFPA 90A with factory-applied insulation, vapor barrier, and end connections. Fire hazard rating of duct assembly shall not exceed 25 for flame spread and 50 for smoke developed. Provide ducts designed for working pressures of 2 inches W.G. positive and 1.5 inches W.G. negative.

Flexible round duct length shall not exceed 5 feet. Secure connections by

SECTION 23 73 33 Page 16 applying adhesive for 2 inches over rigid duct, apply flexible duct 2 inches over rigid duct, apply metal clamp, and provide minimum of three No.

8 sheet metal screws through clamp and rigid duct.

a. Inner duct core: Flexible core shall be interlocking spiral or helically corrugated and constructed of zinc-coated steel, aluminum, or stainless steel; or shall be constructed of inner liner of continuous galvanized spring steel wire helix fused to continuous, fire-retardant, flexible vapor barrier film, inner duct core.

b. Insulation: Inner duct core shall be insulated with mineral fiber blanket type flexible insulation, minimum of one inch thick.

Insulation shall be covered on exterior with manufacturer's standard fire retardant vapor barrier jacket for flexible round duct.

2.4 PIPING SYSTEMS

Provide the following pipe and fittings . Provide dielectric fittings, unions or flanges between steel piping and copper tubing for all piping sizes; except that copper alloy valves and strainers may be used without dielectric fittings, unions or flanges. Water piping sizes 4 inches and smaller shall be copper tubing. Water piping sizes larger than 4 inches shall be copper tubing or steel piping. If steel piping is provided, provide a solids-from-water separator.

2.4.1 Soldered Joint Copper Tubing

Provide ASTM B88, Type L for aboveground piping, Type K for buried piping, with ASME B16.18 or ASME/ANSI B16.22 solder joint fittings, unions, and flanges; provide adapters as required. Provide ASTM B42 copper pipe nipples with threaded end connections. Provide ASTM B32, 95-5 tin-antimony solder, or provide Plumbing Code approved lead-free solder.

2.4.2 Copper Tubing Piping Systems

Provide copper tubing for the following piping systems, except water piping sizes larger than 4 inches shall be copper tubing or steel piping.

a. Chilled water, chilled-hot water, and hot water piping.

b. Cold drain piping from drain pans.

c. Fuel oil supply and return piping with ASME/ANSI B16.26 flared fittings or compression type fittings.

2.4.3 Copper Cold Drain Piping

Provide copper tubing in accordance with paragraph entitled "Copper Tubing" for piping sizes one inch and smaller. Provide ASTM B306 copper tubing and ASME B16.23 solder joint fittings for piping sizes larger than one inch. In lieu of copper tubing, 1.25 inch Schedule 40 polyvinyl chloride (PVC) plastic pipe, fittings, and solvent cement may be provided.

2.4.4 Copper Refrigerant Tubing

Provide ASTM B280, cleaned, dehydrated, and sealed. Provide

SECTION 23 73 33 Page 17

ASME/ANSI B16.22 solder joint refrigerant fittings and adapters.

Provide silver brazing alloy solder and silver brazing alloy flux. During brazing operations bleed a small amount of dry oil-free nitrogen continuously through the refrigerant tubing. Provide ASME/ANSI B16.26 flared fittings.

2.4.5 Steel Piping Systems

Provide steel piping for the following piping systems.

a. Steam and condensate piping.

b. Fuel oil vent, and fill piping.

c. Gas piping.

2.4.5.1 Steel Pipe

Provide ASTM A53/A53M Type E or Type S, or ASTM A106 steel pipe; except ASTM A53/A53M, Type F steel pipe may be provided for water pipe sizes larger than 4 inches and for steam pipe less than 100 psig. Provide Weight Class STD or Schedule No. 40 black steel pipe for welding end connections. Provide Weight Class XS or Schedule No. 80 black steel pipe for threaded end connections and for condensate piping.

2.4.5.2 Steel Pipe Fittings

Provide ASME B16.3 or ASME B16.11 threaded fittings, and ASME/ANSI B16.39 threaded unions. Provide ASME B16.9 buttwelding fittings of the same material and weight as the piping in which fittings are installed; provide backing rings compatible with piping materials being buttwelded. Provide ASME B16.11 socket welding fittings.

2.4.5.3 Steel Pipe Unions

Provide ASME/ANSI B16.39 , Class 150, unions with threaded end connections on one side of threaded valve in steel piping systems.

2.4.5.4 Steel Pipe Flanges

Provide ASME B16.5 , Class 150 welding neck flanges. Extend bolts no less than two full threads beyond the nut with the bolts tightened to the required torque.

a. Gaskets: Provide one piece factory cut gaskets suitable for the intended service. Provide full-face gaskets for flat-face flanged joints, and ring gaskets for raised-face flanged joints.

b. Bolts: Provide ASTM A193/A193M , Grade B7 bolts.

c. Nuts: ASTM A194/A194M , Grade 7.

d. Washers: Provide steel flat circular washers under bolt heads and nuts.

2.4.6 Valves

Valves shall have flanged end connections, except valves smaller than 2.5

SECTION 23 73 33 Page 18 inches may have threaded end connections with a union on one side of the valve. Solder end connections may be used for connections between copper alloy valves and copper tubing.

2.4.6.1 Gate Valves

MSS SP-80 , Class 125, except sizes 2.5 inches and larger shall conform to MSS SP-70 , Class 125.

2.4.6.2 Globe and Angle Valves

MSS SP-80 , Class 125, except sizes 2.5 inches and larger shall conform to MSS SP-85 , Class 125.

2.4.6.3 Check Valves

MSS SP-80 , Class 125, swing check; except sizes 2.5 inches and larger shall conform to MSS SP-71 , Class 125.

2.4.6.4 Butterfly Valves

MSS SP-67 , except sizes 2.5 inches and larger shall have lugged or wafer body designed for installation between ASME Class 150 flanges.

Valves shall have two-position lever handles, except when infinite position lever handles are indicated.

2.4.6.5 Ball Valves

Full port design, copper alloy body, except sizes 2.5 inches and larger shall be cast-iron body. Valves shall have two-position lever handles.

Ball valves may be provided in lieu of gate valves.

2.4.6.6 Square Head Cocks

Provide copper alloy or cast-iron body with copper alloy plugs, suitable for 125 psig water working pressure.

2.4.6.7 Air Venting Valves

Provide copper alloy body valves with automatic or manual air vent as indicated.

2.4.6.8 Combination Pressure and Temperature Relief Valves

ANSI Z21.22 , copper alloy body, automatic reseating, test lever, and discharge capacity based on AGA temperature steam rating.

2.4.6.9 Water Pressure Reducing Valves

ASSE 1003 , copper alloy body, automatic reseating, with test lever.

2.4.6.10 Water Temperature Regulating Valves

Provide copper alloy body, direct acting, pilot operated, for the intended service.

SECTION 23 73 33 Page 19

2.4.6.11 Flow Control Balancing Valves

Copper alloy or cast iron body, copper alloy or stainless internal working parts, and integral pointer that indicates the degree of valve opening.

Valves shall be suitable for 125 psig at 190 degrees F hot water. Valve shall function as a service valve when in fully closed position. Valve body shall have factory-installed tappings for differential pressure meter connections for verification of pressure differential across valve orifice. Meter connections shall have positive check valves or shutoff valves. Each valve shall have metal tag showing the gallons per minute flow for each differential pressure reading.

2.4.6.12 Backflow Prevention Assemblies

Provide reduced pressure principle type backflow prevention assemblies which are approved by and has a current "Certificate of Approval" from the FCCCHR-USC. Listing of the particular make, model/design, and size in the current FCCCHR-USC will be acceptable as the required proof.

2.4.6.13 Refrigerant Valves

ASME/ANSI B31.5 , and shall be copper alloy. Provide valves in each system for servicing and for isolating system components in compliance with

ASHRAE 15.

2.5 PIPING ACCESSORIES

2.5.1 Pipe Hangers and Supports

Provide MSS SP-58 and MSS SP-69 , Type 1 with adjustable type steel support rods, except as specified or indicated otherwise. Attach to steel joists with Type 19 or 23 clamps and retaining straps. Attach to Steel W or S beams with Type 21, 28, 29, or 30 clamps. Attach to steel angles and vertical web steel channels with Type 20 clamp with beam clamp channel adapter. Attach to horizontal web steel channel and wood with drilled hole on centerline and double nut and washer. Attach to concrete with Type 18 insert or drilled expansion anchor. Provide Type 40 insulation protection shield for insulated piping.

2.5.2 Strainers

Pressure and temperature range shall be for the intended service. Provide blowoff outlet with pipe nipple, gate valve, and discharge pipe nipple.

Provide stainless steel strainer element with perforations of 0.047 inch for water, 0.031 inch for steam mixed with condensate, and 0.016 inch for steam. Provide copper alloy or cast-iron body strainers in steam and condensate systems up to 100 psig. Provide steel body strainers in steam and condensate systems 100 psig and greater.

2.5.3 Traps

Provide traps of the types indicated with stainless steel internals.

Pressure and temperature range shall be for the intended service. Traps for steam at 100 psig and greater shall be minimum of ASME Class 150.

SECTION 23 73 33 Page 20

2.5.4 Pressure Gages

Provide single style pressure gage with 4.5-inch dial, brass or aluminum case, bronze tube, gage cock, pressure snubber, and syphon. Provide scale range for intended service.

2.5.5 Thermometers

Provide bi-metal dial type thermometers with stainless steel case, stem, and fixed thread connection; 3 inch diameter dial with glass face gasketed within the case; and accuracy within 2 percent of scale range. Provide scale range for intended service.

2.5.6 Pipe Sleeves

Provide where piping passes entirely through walls, ceilings, roofs, and floors. Secure sleeves in position and location during construction.

Provide sleeves of sufficient length to pass through entire thickness of walls, ceilings, roofs, and floors. Provide one-inch minimum clearance between exterior of piping or pipe insulation, and interior of sleeve or core-drilled hole. Firmly pack space with mineral wool insulation. Seal space at both ends of sleeve or core-drilled hole with plastic waterproof cement which will dry to a firm but pliable mass, or provide a mechanically adjustable segmented elastomeric seal. In fire walls and fire floors, seal both ends of sleeves or core-drilled holes with UL listed fill, void, or cavity material.

2.5.6.1 Sleeves in Masonry and Concrete

Provide steel pipe sleeves or schedule 40 PVC plastic pipe sleeves.

Sleeves are not required where drain, waste, and vent (DWV) piping passes through concrete floor slabs located on grade. Core drilling of masonry and concrete may be provided in lieu of pipe sleeves when cavities in the core-drilled hole are completely grouted smooth.

2.5.6.2 Sleeves not in Masonry and Concrete

Provide 26 gage galvanized steel sheet or PVC plastic pipe sleeves.

2.5.7 Flexible Pipe Connectors

Provide flexible bronze or stainless steel piping connectors with single braid where indicated. Connectors shall be suitable for the intended service.

2.5.8 Sight Glass and Refrigerant Drier

ARI 7l0 . Provide in refrigerant liquid piping.

2.5.9 Expansion Tanks

Construct of steel for minimum working pressure of 125 psig. Tank shall have polypropylene or butyl lined diaphragm which keeps the air charge separated from the water.

2.5.10 Air Separation and Sediment Removal Tanks

External air separation tank shall be steel combination air and sediment separator with internal coalescing medium to remove entrained air and

SECTION 23 73 33 Page 21 suspended solids. It shall be constructed, tested and stamped in accordance with ASME BPVC SEC VIII D1 for a working pressure of 125 psi.

Provide tangential inlet and outlet connections, flanged for sizes 2 1/2 inches and larger. Each unit shall have an internal design suitable for creating the required vortex and subsequent air separation. Provide with automatic air release device and galvanized steel strainer. Provide a blow down connection with a gate valve and piped to nearest floor drain.

2.5.11 Escutcheon Plates

Provide one piece or split hinge metal plates for piping entering floors, walls, and ceilings in exposed spaces. Provide polished stainless steel plates or chromium-plated finish on copper alloy plates in finished spaces. Provide paint finish on metal plates in unfinished spaces.

2.6 HEAT TAPE FOR FREEZE PROTECTION OF PIPING

Provide parallel conduction type that is composed of two copper conductors separated by conductive material and all encased in an insulating jacket.

The heat tape shall be self-regulating that decreases heat output as temperature increases at each point along the length of tape. Provide voltage as indicated. Provide heat tape complete with fittings, adapters, and fittings, adapters, and other devices to connect tape to standard rigid steel conduit junction boxes, switches, or other devices as indicated. Provide tape sealants and jumper connectors up to 5-inches in length for connecting multiple runs. Provide a thermostat that activates the heat tape on drop of outside air temperature at 38 F. Thermostat shall have maximum tolerance of plus or minus 5 degrees F and maximum operating differential of 6 degrees F within temperature operating range.

Wattage per foot of pipe at 50 F shall be as follows. This wattage may be achieved by spiraling the tape around the pipe.

Pipe Diameter (Inches) 1/2 3/4 1 1.25 1.5 2 3 4 6 8

Watt/Foot 2 2 2.5 2.5 3 3.5 4 6 7 8

2.6.1 Pressure/Temperature Test Ports (Plugs)

Provide solid bras test plugs where indicated. Test plug shall be capable of receiving a pressure or temperature probe 1/8-inch o.d. Dual seal core shall be rated zero leakage from vacuum to 200 psig and 0 F to 220 F. Each plug shall be extended through pipe insulation and be capped.

2.7 ACCESS DOORS FOR VALVES

Provide factory-prefabricated and primed flush face steel access doors including steel door frame for with continuous hinges and turn-screw-operated latch. Provide door frame installation in plaster and masonry walls. Furnish doors under this section; install doors under appropriate section of this specification.

2.8 CHEMICAL FEED TANK

Construct of steel for minimum working pressure of 125 psig. Provide chemical pipe, fittings, and valves as specified for water piping. Add borate-nitrite corrosion inhibitors to initial fill water for heating and

SECTION 23 73 33 Page 22 cooling water systems in concentrations of one-half ounce per gallon of system water.

2.9 PROGRAMMABLE THERMOSTATS

Provide programmable microelectonic thermostats. The thermostats shall have the following attributes:

a. Low voltage

b. Battery backup to maintain programming in the event of power failure

c. Automatic control of single stage heating and single stage cooling

d. Minimum 4 temperature settings per day, minimum of separate weekday/weekend day schedule, or 7 day schedules per week

e. Installation shall include initial programming

f. Temporary temperature override

g. Display clock

h. Display shall prompt for program modifications, or functions of buttons…