23 73 33 HEATING VENTILATING AND COOLING SYSTEM.pdf

Paradise Point BOQ Repairs Work Order #20-0046 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.

AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI)

AHRI 1060 I-P (2014) Performance Rating of Air-to-Air Heat Exchangers for Energy Recovery Ventilation Heat Equipment

AHRI DCAACP (Online) Directory of Certified Applied Air-Conditioning Products

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

AHRI 410 (2001; Addendum 1 2002; Addendum 2 2005;

Addendum 3 2011) Forced-Circulation Air-Cooling and Air-Heating Coils

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

AHRI 440 (2008) Performance Rating of Room Fan-Coils

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

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

ASHRAE 62.1 (2010) Ventilation for Acceptable Indoor Air Quality

ASHRAE 90.1 - IP (2016) Energy Standard for Buildings Except Low-Rise Residential Buildings

SECTION 23 73 33 Page 1

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (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 B16.11 (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

ASME B31.9 (2017) Building Services Piping

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 (2019) 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

SECTION 23 73 33 Page 2

ASTM B42 (2015a) Standard Specification for Seamless Copper Pipe, Standard Sizes

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

ASTM B117 (2016) Standard Practice for Operating Salt Spray (Fog) Apparatus

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

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 1940-1 (2003; R 2008) Mechanical Vibration - Balance Quality Requirements for Rotors in a Constant (Rigid) State - Part 1:

Specification and Verification of Balance Tolerances

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 250 (2018) Enclosures for Electrical Equipment (1000 Volts Maximum)

SECTION 23 73 33 Page 3

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

UNDERWRITERS LABORATORIES (UL)

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

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

UL 507 (2017; Reprint Aug 2018) UL Standard for Safety Electric Fans

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. Submit the following in accordance with Section 01 33 00.05 20

CONSTRUCTION SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Equipment layout drawings for:

(1) Air-Handling Units

(2) Dedicated Outside Air Unit

SD-03 Product Data

SECTION 23 73 33 Page 4

Mini-Split Heat Pump Systems Kitchen Hood

Air-cooled water chillers ; G

Room fan-coil air-conditioners ; G

Pumps; G, including performance curves for each impeller size

Fire dampers

Expansion tanks

Air separators

Heat tape

Pipe hangers and supports

Dampers

Diffusers, registers, and grilles

Flexible round ducts

Duct lining

Valves

Pipe and fittings

Air-Handling Units ; G

Boilers ; G

Dedicated Outside Air Unit ; G

SD-06 Test Reports

Mini-Split Heat Pump Systems

Dedicated Outside Air Unit

Air-Handling Units

Air-cooled water chillers

Boilers

SD-08 Manufacturer's Instructions

Installation manual

SD-10 Operation and Maintenance Data

Mini-Split Heat Pump Systems , Data Package 3

Air-Handling Units ;, Data Package 3

SECTION 23 73 33 Page 5

Boilers ;, Data Package 3

Dedicated Outside Air Unit ;, Data Package 3

Air-cooled water chillers , Data Package 3

Room fan-coil air-conditioners , Data Package 2

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

Air-cooled water chillers start-up report

Air-Handling Units start-up report

Mini-Split Heat Pump Systems start-up report

Room fan-coil air-conditioners start-up report

Boilers start-up report

Dedicated Outside Air Unit 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

SECTION 23 73 33 Page 6

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 Unit

Provide single package unit factory assembled, designed, tested, and rated in accordance with AHRI 410 and AHRI 1060 I-P . Unit shall be a split non-packaged indoor unit using 100% outside air, with cooling coil and heating coil, enthalpic plate energy recovery unit. Unit must be completely factory assembled, wired, tested and shipped in one piece. Unit must be capable of varying the amount of outside air delivered to the space based on occupancy, humidity, and indoor air quality.

a. Performance Requirements: General fabrication must comply with requirements in ASHRAE 62.1 , Section 5 - "Systems and Equipment," and Section 7 - "Construction and System Start-up. Maximum Overall U-Value must comply with requirements in ASHRAE 90.1 - IP .

Insulation R-Value R13(2") minimum. Include effects of metal-to-metal contact and thermal bridges in the calculations.

Walls and roof deflection must be within L/240 of the span when subjected to a 15 in-w.g. pressure. Deflection limits must be measured at any point on the surface. Electrical components, devices, and accessories: Listed and labeled as defined in NFPA 70 , by a qualified testing agency, and marked for intended location and application.

b. Cabinet: 2" double wall with injected foam insulation. Exterior casing must be 20-gauge G90 galvanized steel minimum. Interior casing must be 20-gauge G90 galvanized steel minimum. Provide factory-installed shipping skids and lifting lugs. Base rail must be G90 galvanized steel rails for mounting on roof curb or pad as indicated. Comply with requirements in ASHRAE 62.1 for access for inspection, cleaning, and maintenance. Access doors to filters and cores must be hinged and gasketed. All other access doors must be removeable type with door handles, as a minimum. Material and construction of doors must match material and construction of cabinet in which doors are installed. Floor must be reinforced, metal surface; reinforced to limit deflection when walked on by service personnel. Insulation must be below metal walking surface.

Affix unit nameplates on the unit. Cabinet Insulation must be injected foam insulation using environmentally friendly foam blowing agent (or expansion agent) and family of polyurethane foam systems with no global warming potential (GWP), no ozone depletion potential (ODP) and no volatile organic compounds (VOCs) as the expansion agent. Condensate drain pans must have minimum one (1) percent slope in at least two planes to direct water toward drain connection and be large enough to collect condensate from cooling coils including coil piping connections, coil headers, and return bends. Extend drain pan downstream from leaving face to comply with ASHRAE 62.1. Minimum drain pan depth 2 inches deep, fabricated of Stainless-steel. Locate drain pan connection on one end of pan, at lowest point of pan terminated with threaded nipple. Surfaces in contact with airstream must comply with requirements in ASHRAE 62.1 for resistance to mold and erosion.

c. Supply and Exhaust Fans: Direct drive variable Flow

SECTION 23 73 33 Page 7

Electronically Commutated Motors with vibration isolation. Plenum fan must be single width, non-overloading, with backward-curved motorized impellers. Balance fan at G6.3 (6.3mm/sec) per ISO 1940-1 .

Motors must comply with NEMA designation, temperature rating, service factor, and efficiency requirements for motors. EC fan motor to have a IP54 rating. Totally enclosed. Motor bearings L10 lifetime rated bearing life and must exceed 30,000 hours. EC motor efficiency premium efficient per NEMA Standard, service Factor 1.00.

d. Heating and Cooling Coils: Coil rated in accordance with AHRI 410 .

Coil casing stainless steel. Tube material copper. Tube header copper. Fin material aluminum. Fin and tube joints mechanical bond. Coils shall be leak tested with air underwater. Provide phenolic epoxy corrosion-protection coating after assembly for exposure to ASTM B117 5,000 hour salt spray resistance test with no degradation. Provide adequate clearance for accessing, cleaning, servicing and maintaining the coil per coil manufacturer's recommendation.

e. Filter: 2 inch thick disposable pleated filter MERV13. Panel filters arranged for flat or angular orientation, Filters to be removable from one side.

f. Electrical: Factory-installed and -wired switches, motor controllers, transformers, and other necessary electrical devices shall provide a single-point field power connection to unit. The units shall have an electrical connection box to connect all high and low voltage connections. The electrical shall be constructed to permit single-point high voltage power supply connections

g. Fixed-plate cross-flow heat exchanger: Enthalpy core with no moving parts. Energy recovery core must be of the total enthalpy type, capable of transferring both sensible and latent energy between airstreams. Performance criteria are to be as specified in

AHRI 1060 I-P .

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

SECTION 23 73 33 Page 8 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 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

SECTION 23 73 33 Page 9 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 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

SECTION 23 73 33 Page 10 during maintenance activities, and shall deflect no more than .005-inches when sitting on a support structure.

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

SECTION 23 73 33 Page 11

2.1.3.5 Motors

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

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, air-cooled scroll compressor packaged chiller, 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

SECTION 23 73 33 Page 12 vertical direction. Provide guards to protect condenser fins from mechanical damage. Provide equipment guards around base of unit. All piping shall be a minimum schedule 40 mild steel, welded to pipe fitting standards.

a. Controls: BAS interface module to provide interface with the BACnet MSTP protocol. 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 factory-mounted thermal dispersion type 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. Controls must monitor phase loss, over and under voltage, load and line monitoring. Manual latch on critical faults and delayed restart on non-latched errors.

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. Coils shall be microchannel design and shall have a series of flat tubes containing multiple, parallel flow microchannels layered between the refrigerant manifolds.

d. Options: Provide phase loss with under/over voltage protection and with LED indication of the fault type. Provide rubber-in-shear vibration isolators for field installation. Provide wye strainer, to be installed at the evaporator inlet and sized for the design flow rate, with perforation diameter of 0.125" with blowdown port and Victaulic couplings (factory mounted or field installed) Strainer must be installed directly onto the inlet of the evaporator.

e. Base Requirements: All chiller evaporators must be shell and tube design. Power source shall be on 2 separate circuits. One for main chiller disconnect, and one for crankcase heaters and heat trace for freeze protection. Heat trace shall protect evaporator, and all piping that is subject to freezing. A 20 amp convenience utlet (GFCI) shall be installed at the chiller for maintenance needs.

Noise levels shall not exceed 85 decibels 32 feet from chiller.

All compressors shall have sound attenuating blankets. Condenser

SECTION 23 73 33 Page 13 coils shall be protected by louvered coil guards and compressor housing shall have equivalent protection. Chiller must sit on Seismic feet, and rubber pads installed on bottom rails to elevate side rails to allow wash down of debris from under chiller.

Control panel shall have access to microprocessor (controller) for viewing or setup, without interrupting machine operation. Hinged control panel are desired and must be water proof, and not mounted on the outside of the chiller. Multiple scroll compressor shall be utilized so as to prevent large capacity lost due to compressor failures. Compressor modules must have isolation valves and controls to lock out individual compressor stages. Each condenser circuit shall have isolation valves, service valves and replaceable core filter driers. Factory supplied strainer and circuit setters shall be install on return. Sight glasses shall be installed.

2.1.5 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.

2.1.5.1 Casing

Minimum 21 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. Space fins at maximum 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 thermal overheat protection of heaters. For remote thermostatic operation, provide contactor rated for 100,000 duty cycles. Provide room thermostat for pilot duty.

2.1.5.4 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 Accessories

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

2.1.6 Room Fan-Coil Air-Conditioners

Provide units factory assembled, designed, tested, and rated in accordance with AHRI 440 . Units shall be ARI certified or listed in AHRI DCAACP for cooling. Units shall include single hot water and chilled water coil, double width centrifugal fans, three-speed split capacitor motors with integral thermal overload protection, insulated drain pans under cooling

SECTION 23 73 33 Page 14 coils and valves, and filters. Insulate interior of casing with manufacturer's standard insulation.

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

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

HVAC."

c. Horizontal units:

(1) Cabinet units: Provide hinged bottom panel with latches for access to filters and fan motors. Provide adjustable double deflection or stamped discharge grilles as indicated. Provide bottom return air grille.

d. Vertical units: Provide concealed, recessed, and cabinet units where indicated. Provide unit levelers, subbases, and removable front cover for access to filters and fan motors.

(1) Recessed unit: Provide removable front cover for access to entire unit. Provide discharge air registers and return air grille in front cover. Provide top discharge air outlet with one-inch duct collar where supply ducted.

2.1.7 Fire-Tube Condensing Boilers

Boiler shall be natural gas fired, fully condensing, and fire tube design. The boiler shall be factory-fabricated, factory-assembled, and factory-tested, fire-tube condensing boiler with heat exchanger sealed pressure tight, built on a steel base; including insulated jacket;

flue-gas vent; combustion-air intake connections; water supply, return, and condensate drain connections; and controls.

a. Heat Exchanger: The heater exchanger shall bear the ASME "H" stamp for 160 psi working pressure and shall be National Board listed. The heat exchanger shall be constructed of a fully welded 316L stainless steel and of fire tube design. The heat exchanger shall be designed for a single-pass water flow to limit the water side pressure drop. Cast iron, aluminum, or condensing copper tube boilers will not be accepted..

b. Pressure Vessel: The pressure vessel shall be in accordance with ASME Section IV pressure vessel code. The pressure vessel shall be designed for a single-pass water flow to limit the water side pressure drop. The pressure vessel shall contain a volume of water no less than 13 gallons.

c. Burner: Natural gas, forced draft single burner premix design.

The burner shall be high temperature stainless steel with a woven Fecralloy outer covering to provide modulating firing rates. The burner shall be capable of the stated gas train turndown without loss of combustion efficiency.

d. Blower: Boiler shall be equipped with a pulse width modulating blower system to precisely control the fuel/air mixture to provide modulating boiler firing rates for maximum efficiency. The burner firing sequence of operation shall include pre-purge, firing, SECTION 23 73 33 Page 15 modulation, and post-purge operation.

e. Gas Train: The boiler shall be supplied with a negative pressure regulation gas train and shall be capable of 10:1 turndown.

f. Ignition: Spark ignition with 100 percent main-valve shutoff with electronic flame supervision.

g. Casing:

(1) Heavy gauge primed and painted steel jacket with snap-in closures.

(2) NEMA 250, Type 1A control compartment enclosures.

(3) Baked-enamel protective finish.

(4) Minimum 1/2-inch-thick, mineral fiber insulation surrounding the heat exchanger.

(5) Inlet and vent duct collar combustion-air connections.

2.1.7.1 Trim

Include devices sized to comply with ASME B31.9 .

a. Aquastat controllers operating, firing rate, and high limit.

b. Safety Relief Valve: ASME rated 50 psig setting.

c. Pressure and Temperature Gage: Minimum 3-1/2-inch- diameter, combination water-pressure and -temperature gage. Gages shall have operating-pressure and -temperature ranges, so normal operating range is about 50 percent of full range.

d. Boiler Air Vent: Manual.

e. Drain Valve: Minimum NPS 3/4 hose-end gate valve.

f. Circulation Pump: Variable speed boiler pump to keep a constant Delta T at all modulation rates.

2.1.7.2 Controller

The boiler shall include controls with a multi-colored graphic LCD display with USB port connection. The boiler shall have the capability to accept a 0-10 VDC input connection for BMS control of modulation or setpoint, enable disable of the boiler, variable system pump signal and a 0-10VDC output of boiler modulation rate. The Boiler shall have built-in sequencing options for "lead lag" or "efficiency optimized" modulation logic, with both capable of rotation while maintaining modulation of up to eight boilers without utilization of an external controller.

2.1.7.3 Building Automation System Interface

Factory install hardware and software to enable building automation system to monitor, control, and display boiler status and alarms. A communication interface with building automation system shall enable building automation system operator to remotely control and monitor the

SECTION 23 73 33 Page 16 boiler from an operator workstation. Control features available, and monitoring points displayed, locally at boiler control panel shall be available through building automation system

2.1.7.4 Venting

Exhaust flue must be Category IV approved PVC, CPVC, PP or stainless steel sealed vent material from one of the approved manufacturers listed in the Installation and Operation manual. Boilers exhaust vent length must be able to extend to 100 equivalent feet.

2.1.7.5 Burner and Hydrostatic Test

Factory adjust burner to eliminate excess oxygen, carbon dioxide, oxides of nitrogen emissions, and carbon monoxide in flue gas and to achieve combustion efficiency; perform hydrostatic test.

2.1.8 Kitchen Hood

Provide 30" wide wall-mount, under cabinet range hood with integral wet chemical fire suppression system and light bulb. Unit shall be wall mounted so that the bottom of the mounting bracket sits 24” to 30” above the cooktop. Unit shall be of stainless steel construction (#18 & #20 GA, polished 304) with no sharp edges and brushed finish. Unit shall have fire suppression system factory installed. Activation of the mechanical fire suppression system shall be by 212 or 280 degree fusible link. Wet chemical extinguishing agent shall be pressurized potassium citrate / potassium acetate mix. Unit shall have centrifugal fan with minimum air delivery of 140 CFM with fan speed controller. Unit shall be ETL listed, tested to UL300A stanfards, fan motor shall be permanantly lubricated and meet UL 507 . Unit shall include a fuel shut-off device for electric appliances, activated at suppression system discharge. Unit shall also automatically disconnect range element once a certain pre-set temperature in reached. Unit shall have multiple alarm contacts pre-installed (local, remote & trouble alarms) and an audible buzzer. Lighting shall be by 60w shatter-proof bulb.

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.

SECTION 23 73 33 Page 17

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.

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

SECTION 23 73 33 Page 18 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.

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 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

SECTION 23 73 33 Page 19 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 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.

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 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.

2.4.5 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

SECTION 23 73 33 Page 20 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.

2.4.6 Steel Piping Systems

Provide steel piping for the following piping systems.

a. Gas piping .

2.4.6.1 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.

2.4.6.2 Steel Pipe Fittings

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

2.4.6.3 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.

2.4.6.4 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.

2.4.7 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. Solder end connections may be used for connections between copper alloy valves and copper tubing.

2.4.7.1 Check Valves

MSS SP-80 , Class 125, swing check; except sizes 2.5 inches and larger

SECTION 23 73 33 Page 21 shall conform to MSS SP-71 , Class 125.

2.4.7.2 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.

2.4.7.3 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.

2.4.7.4 Air Venting Valves

Pro…