23 73 33 REVISED.pdf

Building 1 Renovation Work Order #19-0037 Camp Lejeune, Jacksonville, NC

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.

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI Z83.8/CSA 2.6 (2016; Errata 2017) Gas Unit Heaters, Gas Packaged Heaters, Gas Utility Heaters, and Gas-Fired Duct Furnaces

AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI)

AHRI DCUP (Online) Directory of Certified Unitary Products

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

AHRI 430 (2009) Central-Station Air-Handling Units

AHRI 550/590 I-P (2015; ERTA 2016) Performance Rating Of Water-Chilling and Heat Pump Water-Heating Packages Using the Vapor Compression Cycle

AHRI 710 I-P (2009) Performance Rating of Liquid-Line Driers

AHRI 880 I-P (2011) Performance Rating of Air Terminals

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING

ENGINEERS (ASHRAE)

ASHRAE 15 & 34 (2013) ASHRAE Standard 34-2016 Safety Standard for Refrigeration Systems/ASHRAE Standard 34-2016 Designation and Safety Classification of Refrigerants-ASHRAE Standard 34-2016

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

SECTION 23 73 33 Page 4

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

ASME B16.18 (2018) Cast Copper Alloy Solder Joint Pressure Fittings

ASME B16.22 (2013) Standard for Wrought Copper and Copper Alloy Solder Joint Pressure Fittings

ASME B16.23 (2011) 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 (2018) Power Piping

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

ASTM INTERNATIONAL (ASTM)

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

ASTM A106/A106M (2018) Standard Specification for 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 Nuts for Bolts for High-Pressure or High-Temperature Service, or Both

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 (2015a) Standard Specification for Seamless Copper Pipe, Standard Sizes

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

ASTM B280 (2018) Standard Specification for Seamless Copper Tube for Air Conditioning and

SECTION 23 73 33 Page 5

Refrigeration Field Service

ASTM B306 (2013) Standard Specification for Copper Drainage Tube (DWV)

ASTM C1071 (2016) Standard Specification for Fibrous Glass Duct Lining Insulation (Thermal and Sound Absorbing Material)

FOUNDATION FOR CROSS-CONNECTION CONTROL AND HYDRAULIC RESEARCH

(FCCCHR)

FCCCHR List (continuously updated) 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 (2017; Errata 1 2017) Butterfly Valves

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

MSS SP-71 (2011; Errata 2013) Gray Iron Swing Check Valves, Flanged and Threaded Ends

MSS SP-80 (2013) Bronze Gate, Globe, Angle and Check Valves

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA ICS 6 (1993; R 2016) Industrial Control and Systems: Enclosures

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 (2018) Standard for the Installation of Air Conditioning and Ventilating Systems

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION

(SMACNA)

SMACNA 1966 (2005) HVAC Duct Construction Standards Metal and Flexible, 3rd Edition

SMACNA 1972 CD (2012) HVAC Air Duct Leakage Test Manual - 2nd Edition

SECTION 23 73 33 Page 6

UNDERWRITERS LABORATORIES (UL)

UL Bld Mat Dir (updated continuously online) Building Materials Directory

UL Elec Equip Dir (2011) Electrical Appliance and Utilization Equipment Directory

UL 181 (2013; Reprint Apr 2017) UL Standard for Safety Factory-Made Air Ducts and Air Connectors

UL 555 (2006; Reprint Aug 2016) UL Standard for Safety Fire Dampers

1.2 SYSTEM DESCRIPTION

Provide 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:

SD-02 Shop Drawings

Equipment layout drawings for:

(1) Dedicated outside air systems

(2) Air-Handling Units

SD-03 Product Data

Dedicated outside air systems ; G

Mini-Split Heat Pump Systems

Air-cooled water chillers ; G

Variable air volume (VAV) terminals

Pumps, including performance curves for each impeller size

Fire dampers

Expansion tanks

Air separators

Heat tape

SECTION 23 73 33 Page 7

Pipe hangers and supports

Dampers

Diffusers, registers, and grilles

Pre-Fabricated Insulated Ductwork ; G

Flexible round ducts

Duct lining

Valves

Pipe and fittings

Air-Handling Units ; G

Cabinet Unit Heaters

Gas-Fired Unit Heater

SD-06 Test Reports

Dedicated outside air systems

Mini-Split Heat Pump Systems

Air-Handling Units

Air-cooled water chillers : greater than 180,000 Btuh.

SD-08 Manufacturer's Instructions

Installation manual

SD-10 Operation and Maintenance Data

Dedicated outside air systems , Data Package 3

Mini-Split Heat Pump Systems , Data Package 3

Air-Handling Units ;, Data Package 3

Cabinet Unit Heaters ;, Data Package 3

Air-cooled water chillers , Data Package 3

Pumps, Data Package 2

Fire dampers , Data Package 1

Submit in accordance with Section 01 78 23 , "Operation and Maintenance Data."

SD-11 Closeout Submittals

Dedicated outside air systems start-up report

SECTION 23 73 33 Page 8

Air-cooled water chillers start-up report

Air-Handling Units start-up report

Mini-Split Heat Pump Systems start-up report

Air filter inventory

1.3.1 Equipment layout drawings

Submit drawings showing equipment layout including foot print, piping, conduit, control cabinets, door swings, and power disconnects.

1.3.2 Installation Manual

Provide for each item of equipment.

1.3.3 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

Provide single package unit factory assembled, designed and tested. Unit shall be ARI certified or rated in AHRI DCUP for cooling. Provide guards to protect condenser fins. Unit shall be listed in UL Elec Equip Dir .

Unit shall include fans, evaporator coil, filters, low leakage dampers, compressor, condenser, and controls. Provide heating section when indicated. Insulate interior of casing with manufacturer's standard insulation.

2.1.1.1 Casing Construction

Unit shall be constructed for outdoor installation on a roof curb.

2.1.1.1.1 Duct Connections

Duct connection shall be sidewall. Horizontal duct connections shall be made possible without the use of a transitional curb.

SECTION 23 73 33 Page 9

2.1.1.1.2 Base

Base rails shall be constructed of a minimum of heavy gage galvanized steel with 16 gage integral floor pan. Base must have a minimum 4" overhang over the top of a roof curb to prevent water infiltration. Floor seams shall have a raised rib joint. There shall be no penetrations through the floor of the unit within the perimeter of the curb.

2.1.1.1.3 Panels

Casing shall be constructed with minimum 2-inch, foam-injected, double-wall panels with an insulation value of R-12. Individual panels shall be constructed so that they are thermally broken (there shall be no metal-to-metal contact between the interior and exterior sheet metal of each panel). Interior side of panel shall be 22 gage G-90 galvanized steel. Exterior side of panel shall be 22 gage painted steel rated for 1,000 hours in accordance with ASTM B117 and as prepared per ASTM D1654.

2.1.1.1.4 Insulation

Insulation of shall be 2 lb per ft3 foam insulation with an average R-value of 12. Insulation water absorption must be no more that 0.038 lb per ft per ASTM D 2842 and show "no growth" per ASTM G21 biocide testing.

3.4.5.3. No insulation shall be exposed to the air stream. Fiberglass insulation is not acceptable.

2.1.1.1.5 Access Doors

Access doors shall be provided for access to all components requiring regular maintenance or inspection. Access doors shall have a minimum of two quarter-turn compression latches with adjustable catches. Access door construction shall be identical to unit casing. Interior side of access doors shall be 22 gage G-90 galvanized steel. Exterior side of panel shall be 22 gage painted steel rated for 1000 hours in accordance with ASTM B117 and as prepared per ASTM D1654. Access doors shall be sealed with a full-perimeter gasket constructed of Mylar-encased low-density foam.

2.1.1.2 Blowers/Motors

Provide fans of type and class as specified on the schedule. Direct drive fans provided with ECM motors shall have a welded-aluminum impeller that is dynamically balanced as an assembly. Fan shall be maintenance free throughout its operating life. Fans shall be balanced to G6.3 per AMCA

204. No vibration isolation is necessary. Motor contains integrated PID controller and accepts 0-10VDC input for variable speed control

2.1.1.3 Dampers

2.1.1.3.1 Motorized Dampers

a. Motorized dampers shall be low leakage type with aluminum construction, airfoil blades, vinyl edge seals, metal jamb seals, and synthetic bearings.

b. Provide outside air shut-off damper, 2-position actuator.

c. Provide exhaust air shut-off damper, 2-position actuator.

SECTION 23 73 33 Page 10

2.1.1.4 Filters

2.1.1.4.1 Outdoor air intake hood

Filter rack shall accommodate 1" media. Manufacturer shall provide 1 set of 1" aluminum filter media. Filter sections shall be accessible outside the unit and located in the outdoor air intake hood.

2.1.1.4.2 Outdoor air filters

Outdoor air filter rack shall accommodate factory-provided 2" MERV 8 filters. Filter sections shall be accessible through a 2" foam-injected, double-wall, hinged access door with quarter-turn latches.

2.1.1.4.3 Supply air filters

Supply air filter rack shall accommodate 2" MERV 8 filters. Filter sections shall be accessible through a 2" thick, foam-injected, double-wall, hinged access door with quarter-turn latches.

2.1.1.4.4 Return air filters

Return air filter rack shall accommodate 2" MERV 8 filters. Filter sections shall be accessible through a 2" thick, foam-injected, double-wall, hinged access door with quarter-turn latches.

2.1.1.5 Cooling - Packaged Air Cooled DX

Unit shall be provided with a complete factory piped, wired, tested and charged air-cooled DX cooling. Refrigeration systems shall be equipped with two independent refrigerant circuits. Refrigeration system shall be provided with thermal expansion valve (TXV) incorporating adjustable superheat.

2.1.1.5.1 Evaporator coil

Evaporator coil shall be rated in accordance to ARI standards and pressure tested for 250 psi working pressure.Refrigeration system shall have interlaced evaporator coils. Coil casing shall be constructed of 304 stainless steel casing. Coil tubes shall be constructed of 1/2" diameter, 0.016" thick seamless copper tubing. Coil fins shall be constructed of 0.0060" thick aluminum.

2.1.1.5.2 Drain Pan

Drain pan shall be constructed of a minimum of 18 gage 201 stainless steel. Drain pan shall be double-sloped to ensure condensate removal from unit. Drain pan shall extend a minimum of 8" past the evaporator coil to ensure condensate retention.

2.1.1.5.3 Modulating hot-gas reheat

Modulating hot-gas reheat coil shall be separated from the evaporator coil by a minimum of 6" in the direction of airflow to prevent the re-evaporation of condensate, provide room for coil cleaning, and allow control system to monitor evaporator coil leaving air temperature. Coil shall be rated in accordance to ARI standards and pressure tested for 250 psi working pressure. Coil casing shall be constructed of 304 stainless steel casing. Coil tubes shall be constructed of 5/16" diameter, 0.016"

SECTION 23 73 33 Page 11 thick seamless copper tubing. Coil fins shall be constructed of 0.0060" thick aluminum fins. Hot-gas reheat shall be controlled through a factory-supplied modulating control valve.

2.1.1.5.4 Compressors

Compressors shall have direct-drive, hermetic, digital scroll type compressors with centrifugal type oil pumps. Motor shall be suction gas-cooled and shall have a voltage utilization range of plus or minus 10 percent of unit nameplate voltage. Internal overloads shall be provided with the scroll compressors. Crankcase heaters shall be included.

Compressor shall be able to fully modulate from 20%-100%..

Compressors shall be installed in an isolated compartment separate from supply airflow, return airflow, microprocessor controller, non-fused disconnect, compressor relays, fan motor VFD, and all other electrical components inside the unit. Compressors shall be installed using manufacturer's recommended rubber vibration isolators.

2.1.1.5.5 Condenser Coils

Provide condenser coils with galvanized casing, seamless copper tubes, and aluminum fins. Coil casing shall be constructed of 304 stainless steel casing. Coil tubes shall be constructed of 5/16" diameter, 0.016" thick seamless copper tubing. Coil fins shall be constructed of 0.0060" thick aluminum fins.

2.1.1.5.6 Condensing Fans

Condensing section shall be equipped with high-performance 1200 rpm condensing fans. Condensing fan blades shall be constructed out of a polymer, sickle-shaped blades with serrated trailing edges for sound reduction. Individual fans shall be capable of an Lw(A) of 75 dB as tested to ISO 5801. Condensing fan motor shall be electrically-commutated and capable of modulation without the need of an external variable frequency drive. All condensing fans shall modulate in unison to maintain the head pressure set point.

2.1.1.5.7 Options

Provide hot gas bypass shall be provided on lead refrigeration circuit.

Lead refrigeration circuit shall utilize Digital Scroll compressor capable of 10:1 turndown. Coating shall be applied on the evaporator, condenser and hot gas reheat coils passing ASTM B117 90 5,000 hour salt spray resistance test as installed.

2.1.1.6 Heating - Indirect Gas Furnace

Unit shall be provided with AGA-certified, forced-draft, 10:1 turndown indirect gas furnace. Furnace assembly shall include electronic modulating gas valve, two-speed combustion fan and 409 stainless steel heat exchanger.

2.1.1.7 Electrical

Units shall be factory wired with a single point power connection. Units shall be wired according to NEC and listed per ETL. ETL listing shall cover all components of the ventilator and not be limited to the control panel. All major electrical components shall be UL listed. Unit shall be constructed with an integral control center isolated from supply airflow, SECTION 23 73 33 Page 12 exhaust airflow, compressors, and heating elements.

The following items shall be provided and wired within the control center by the factory: non-fused disconnect, sub-circuit fusing, low voltage transformers, terminal block, fan motor variable frequency drives.

Electrical panel must house all high voltage components such as terminal blocks, variable frequency drives, and fuse blocks.

Unit shall include a factory supplied, mounted, and wired phase and voltage monitor.

2.1.1.8 Controls

Units shall include factory supplied, mounted, wired, and tested stand-alone microprocessor controls. Microprocessor controller shall be factory-programmed for discharge air control and use an internal 7-day time clock. Microprocessor controller shall be mounted in a weather-proof enclosure and accessible without exposing the operator to high voltage wiring or having to turn off or circumvent the main disconnect.

Microprocessor controller shall include local liquid crystal display (LCD) for user interface.

The following sensors shall be factory supplied, mounted, and wired inside the unit: outdoor air humidity sensor, outdoor air temperature sensor, evaporator coil leaving air temperature sensor, supply air filter pressure monitoring.

The following devices shall be factory supplied but ship loose and require field installation and wiring: supply air temperature sensor and smoke detectors.

Microprocessor controller shall include BACnet MS/TP communications for building management system interface.

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 an inverter driven heat pump design.

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

SECTION 23 73 33 Page 13 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 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

SECTION 23 73 33 Page 14 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 Air-Handling Units

Provide units factory assembled, designed, tested, and rated in accordance with AHRI 430 . Units shall be ARI certified for cooling. Provide heating and cooling units including hot water coils and chilled water coils. Unit shall include fan section, coil section with drain pan, low leakage opposed blade damper section, variable frequency motor controller, filter section and access panels. Insulate interior of casing with manufacturer's standard insulation. Provide nylon bushings for dampers. Unit layout and configuration shall be as defined in project plans and schedule.

2.1.3.1 Unit Casing

a. The entire air handler shall be constructed of galvanized steel.

Casing finished to meet ASTM B117 250-hour salt-spray test. The removal of access panels or access doors shall not affect the structural integrity of the unit. All removable panels shall be gasketed. All doors shall have gasketing around full perimeter to prevent air leakage. Contractor shall be responsible to provide connection flanges and all other framework that is needed to properly support the unit.

b. All panels shall be 2-inch double wall construction to facilitate cleaning of unit interior. Casing deflection shall not exceed .005-inch deflection per linear foot under negative or positive pressure, up to unit casings maximum design limit of pressure.

c. Unit floor shall be of sufficient strength to support 300-lb load during maintenance activities, and shall deflect no more than .005-inches when sitting on a support structure.

SECTION 23 73 33 Page 15

d. Panel insulation shall provide a minimum thermal resistance (R) value of 13 ft^2*h*F/Btu throughout the entire unit. Insulation settling prohibited. Panel assembly shall comply with NFPA 90A.

e. Access panels and/or access doors shall be provided in all sections to allow access to drain pan, coil(s), motor, drive components and bearings for cleaning, inspection, and maintenance.

f. Access panels and doors shall be fully removable without the use of specialized tools to allow complete access of interior surfaces.

2.1.3.2 Access Doors

a. Access doors shall be 2-inch double-wall construction. Interior and exterior shall be of the same construction as the interior and exterior wall panels.

b. Gasketing shall be provided around the full perimeter of the doors.

c. Door hardware shall be surface-mounted.

d. Handle hardware shall be designed to prevent unintended closure.

e. Access doors shall be hinged and removable without the use of specialized tools to al.

f. All doors shall be a 60-inch high when sufficient unit height is available, or the maximum height allowed by the unit height.

2.1.3.3 Primary Drain Pan

a. The drain pan shall be designed in accordance with ASHRAE 62.1 being of sufficient size to collect all condensation produced from the coil and sloped in two planes, pitched toward drain connections, promoting positive drainage to eliminate stagnant water conditions when unit is installed level and trapped per manufacturer's requirements. The outlet shall be located at the lowest point of the pan and shall be sufficient diameter to preclude drain pan overflow under any normally expected operating condition. Drainpan shall be stainless steel.

2.1.3.4 Fans

a. Fan sections shall have a minimum of one hinged and latched access door located on the drive side of the unit to allow inspection and maintenance of the fan, motor, and drive components.

b. Provide fans of type and class as specified on the schedule.

Direct drive fans provided with ECM motors shall have a welded-aluminum impeller that is dynamically balanced as an assembly. Fan shall be maintenance free throughout its operating life. Fans shall be balanced to G6.3 per AMCA 204. No vibration isolation is necessary. Motor contains integrated PID controller and accepts 0-10VDC input for variable speed control

2.1.3.5 Motors

a. All motors shall be factory-installed and run tested.

SECTION 23 73 33 Page 16

2.1.3.6 Coil/Access Section

a. Unit(s) shall include a separate section housing a coil section and access section as one assembly. Refer to drawings to determine which unit(s) includes the additional section.

b. Section shall include a stainless steel drain pan and an access door of sufficient size to allow for visual inspection of the leaving face of the first coil in the airstream and entering face of the second coil in the airstream shall be included as standard in this section.

c. Access door shall be of the same construction as all other doors on the unit. Refer to door specification for location of door(s).

d. Coils to be coated for exposure to ASTM B117-90 6,000 hour salt spray resistance test with no degradation.

2.1.3.7 Filters

a. Provide factory-fabricated filter section of the same construction and finish as unit casings. Filter section shall have side access filter guides and access door(s) extending the full height of the casing to facilitate filter removal. Provide fixed filter blockoffs as required to prevent air bypass around filters.

Blockoffs shall not need to be removed during filter replacement.

Filters to be of size, and quantity needed to maximize filter face area of each particular unit size.

b. Filter type, MERV rating, and arrangement shall be provided as defined in project plans and schedule.

2.1.3.8 Dampers

a. All dampers shall be internally mounted. Dampers shall be premium ultra low leak and located as indicated on the schedule and plans. Parallel blade arrangement shall be provided as indicated on the schedule and drawings. Dampers shall be double-skin airfoil design. Leakage rate shall not exceed 3 CFM/square foot at one inch water gauge complying with ASHRAE 90.1 maximum damper leakage and shall be AMCA licensed for Class 1A. All leakage testing and pressure ratings shall be based on AMCA Standard 500-D.

2.1.4 Air-Cooled Water Chillers

Provide single package units factory assembled, designed, tested, and rated in accordance with AHRI 550/590 I-P with air-cooled condensers. Provide not less than two independent refrigerant circuits for multicompressor units.

Provide direct expansion shell and tube design, refrigerant circuits, including electric-motor-driven refrigerant compressors with integral crankcase heater, air-cooled condenser, receiver, chiller, piping, controls, and accessories mounted in a cabinet. Provide refrigerant, internal pressure relief device, solenoid valve, combination liquid-line strainer-drier, expansion valve, and service valves. Condenser discharge air shall be in vertical direction. Provide guards to protect condenser fins from mechanical damage. Provide equipment guards around base of unit. Crankcase heaters are not required when scroll compressors are

SECTION 23 73 33 Page 17 provided.

a. Controls: Provide factory-wired digital electronic controls including adjustable programmable thermostat for chilled water temperature control, high-low pressure control, low water temperature safety thermostat, ON-OFF unit switch, and nonrecycling pump-down relay. Controls shall also include maximum operating pressure expansion valves and programming of microprocessor chiller controls or high temperature controller for operation of compressors in cool down mode for start-up or changeover when entering water temperature is in 60 to 90 degree F range. Provide electrical interlock between water chiller and chilled water pump to prevent chiller from operating unless pump is running. Provide flow switch or flow sensors in chilled water return piping to stop compressor in event of water flow failure.

Condenser fan electric motors shall be drip-proof, with built-in three-phase overload protection, mounted inside the casing.

Compressor motor stoppage due to thermal and pressure overload shall require manual restart. Provide control and interlock wiring. Provide thermostat controlled electric heater cable around chiller and exterior piping for freeze protection down to 0 degree F air temperature, to operate when ambient exterior air temperature falls below 40 degrees F. Provide low ambient control to 15 degrees F

b. Weatherproof casing: Provide removable gasketed panels designed to exclude driving rain for access to compressors, motors, and controls.

c. Coils to be coated for exposure to ASTM B117-90 5,000 hour salt spray resistance test with no degradation.

2.1.5 Cabinet Unit Heaters

Provide units factory assembled, designed, and tested. Units shall include single heating hot water, centrifugal fans, three-speed split capacitor motors with integral thermal overload protection, and filters.

a. Filters: Provide UL listed throwaway fiberglass filters, standard dust-holding capacity.

b. Space temperature controls: Provide controls under Section 23 09 23.13 , "BACnet DIRECT DIGITAL CONTROL SYSTEMS FOR HVAC."

c. Vertical units: Provide cabinet units. Provide unit levelers, subbases, and removable front cover for access to filters and fan motors.

(1) Cabinet unit: Provide removable front, side, and top panels. Provide adjustable double deflection or stamped discharge grille as indicated.

2.1.6 Gas-Fired Unit Heater

ANSI Z83.8/CSA 2.6 and AGA label. Self-contained and factory assembled, propeller or centrifugal fan with capacities expressed as Btu per hour output and cubic foot-per-minute air delivery, operating conditions, and mounting arrangements as indicated. Average fan bearing life shall be

SECTION 23 73 33 Page 18 minimum 200,000 hours at operating conditions. Provide fan motor with direct or belt drive. Construct fan-guard motor mount of steel wire.

Equip each heater with individually adjustable package discharge louver.

Louvers may be substituted by discharge cones or diffusers. Provide thermostats as indicated. Furnish circuit breaker disconnect switch.

2.1.6.1 Casing

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

2.1.6.2 Heat Exchanger

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

2.1.6.3 Burners

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

2.1.6.4 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.

2.1.6.5 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.

2.1.6.6 Venting

Indoor, separated combustion, power vented.

2.1.6.7 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.

2.1.7 Electric Unit Heater

UL listed; wattage, voltage, phase, and number of steps as indicated.

Provide control-circuit terminals and single source of power supply.

Heater 5 Kw and larger shall be three-phase, with load balanced on each of the three phases. Limit leaving air temperature below 140 degrees F at 60 degrees F entering air.

2.1.7.1 Casing

Minimum 21 gage steel.

2.1.7.2 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

SECTION 23 73 33 Page 19 fins. Enclose element ends in terminal box. Space fins at maximum six fins per inch. Limit fin surface temperature 550 degrees F at any point during normal operation.

2.1.7.3 Controls

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

2.1.7.4 Wiring

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

2.1.7.5 Accessories

Provide fan switching devices to independently operate fan motor for summer ventilation and winter heat recovery.

2.1.8 Variable Air Volume (VAV) Terminals

Provide units factory assembled, designed, tested, and rated in accordance with AHRI 880 I-P . Units shall include casing, VAV damper or valve and primary air inlet cone with high and low pressure flow sensors.

Provide hot water heating coils.

a. Casing: Provide removable access panels for servicing internal components without disturbing duct connections. Insulate inside of casing with manufacturer's standard insulation. Units shall have round primary damper or valve and unit mounting brackets.

b. Flow sensor: Sensor shall be ring or cross type with minimum of two pickup points which average the velocity across the inlet.

Flow measurement shall be within plus or minus 5 percent of rated airflow with 1.5 diameters of straight duct upstream of unit and inlet static variation of 0.5 to 5.0 inches W.G. Flow measuring taps and calibration flow chart shall be supplied with each unit for field balancing airflows.

c. Primary VAV damper or valve: Galvanized steel damper blade shall close against gasket inside unit. Connect damper to operating shaft with a positive mechanical connection. Provide nylon bearing for damper shaft. Cylindrical die cast aluminum valve inlet tapered to fit round flexible ducts with integral flow diffuser and beveled self-centering disc. Damper or valve leakage at shutoff shall not exceed 2 percent of capacity at 1-inch W.G.

pressure.

d. Regulator: Volume regulator shall be electronic. Electronic controls contained in NEMA ICS 6 , electric Type 1 enclosure sealed from airflow. Controls shall be mounted on side of unit or on air valve. System powered regulators shall not be permitted. Volume regulator shall reset primary air volume as determined by thermostat, within upstream static pressure variation noted in paragraph entitled "Flow Sensor." Volume regulators shall be field adjustable and factory set and

SECTION 23 73 33 Page 20 calibrated to indicated maximum and minimum primary airflows.

Volume regulators shall be direct acting and normally open upon loss of power.

e. Hydronic Heating Coils : opper tube, with mechanically bonded aluminum fins spaced no closer than 0.1 inch, and rated for a minimum working pressure of 200 psig and a maximum entering-water temperature of 220 deg F. Include manual air vent and drain valve .

2.1.9 Pumps

a. In-Line pumps: Provide pumps constructed of manufacturer's standard materials suitable for chilled water and hot water heating systems. Pumps shall have mechanical seals and drip-proof electric motors.

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."

2.3 METAL DUCT SYSTEMS

Provide shop-fabricated, zinc-coated steel ducts conforming to ASTM A653/A653M coating designation G60. Fabricate, construct, brace, reinforce, install, support, and seal ducts and accessories, and test ducts in accordance with SMACNA 1966 and SMACNA 1972 CD. 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.

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 1966 for vanned elbows. Turning vanes shall be single wall with trailing edges.

SECTION 23 73 33 Page 21

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.

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 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.

2.3.6 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.

2.3.7 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 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.

SECTION 23 73 33 Page 22

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.

2.3.8 Duct Lining

Provide for all transfer ductwork . Provide ASTM C1071 fiberglass duct lining, minimum of one inch thick, with black-pigmented fire-resistant coating on side exposed to airstream. Secure to duct interior with 100 percent coverage of adhesive and with mechanical fastening devices, spaced in accordance with SMACNA 1966. Provide metal nosing at duct lining beginnings and endings.

2.4 Pre-Fabricated Insulated Ductwork

Outdoor Installations: Provide double layered (total 50 mm thick min), double walled phenolic foam pre-insulated rectangular ductwork for all outdoor installations. Duct panels shall be manufactured of CFC/HCFC free phenolic foam (or other approved) bonded on both sides to a factory applied foil facing with a minimum thickness of 60 micron internal and 200 micron external. Phenolic panels are to be pre-fabricated and assembled into male/female interlocking sections. Thermal resistance R-10 minimum to include equivalent R-Value at all joints with no metal pass through.

Outdoor cladding shall meet UL 181. Ductwork shall be fabricated per "SMACNA HVAC Phenolic Duct Construction Standards." Duct shall be fabricated not to pond water.

2.5 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.

2.5.1 Soldered Joint Copper Tubing

Provide ASTM B88, Type L for aboveground piping, Type K for buried piping, with ASME B16.18 or ASME 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.

SECTION 23 73 33 Page 23

2.5.2 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.

2.5.3 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.

2.5.4 Copper Refrigerant Tubing

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

2.5.5 Buried Preinsulated Water Piping

Provide buried preinsulated water piping in conduit complete and ready for operation. Install in accordance with fabricator's published literature. Provide copper tubing for carrier piping; carrier piping sizes larger than 4 inches may be steel piping. Minimum depth of cover shall be 2 feet.

a. Factory-applied insulation: Provide polyurethane or polyisocyanate insulation, rated for not less than 250 degrees F service, completely filling the space between carrier pipe and conduit.

b. Factory-applied conduit: Provide each section of carrier pipe with insulation and conduit complete with waterproof conduit caps at both ends. Mark each section of conduit with fabricator's name, product identification, and publications to which the items conform. Provide same type of insulation and conduit material over field-insulated joints and fittings; provide waterproof shrink sleeves over field-insulated joints to overlap not less than 6 inches of each conduit section.

c. Bedding: Accurately grade trench bedding with minimum of 6 inches of sand. Backfill sand to minimum of 6 inches above and below conduit. Lay bedding to firmly support conduit along entire length.

d. Buried utility warning tape: Provide detectable tape for warning of buried piping.

2.5.6 Steel Piping Systems

Provide steel piping for the following piping systems.

SECTION 23 73 33 Page 24

a. Gas piping .

2.5.6.1 Steel Pipe

Provide ASTM A53/A53M Type E or Type S, or ASTM A106/A106M steel pipe.

Provide Weight Class XS or Schedule No. 80 black steel pipe for threaded end connections.

2.5.6.2 Steel Pipe Fittings

Provide ASME B16.3 or ASME B16.11 threaded fittings, and ASME/ANSI B16.39 threaded unions.

2.5.6.3 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.

2.5.6.4 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.

2.5.7 Valves

Valves shall have flanged end connections, except valves smaller than 2.5 inches may have threaded end connections with a union on one side of the valve.