23 73 33.pdf

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.

ASSOCIATION OF HOME APPLIANCE MANUFACTURERS (AHAM)

AHAM RAC-1 (1982; R2008) Directory of Certified Room Air Conditioners

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

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

AMCA 500-L (2015) Laboratory Methods of Testing Louvers for Rating

AMERICAN BEARING MANUFACTURERS ASSOCIATION (ABMA)

ABMA 9 (2015) Load Ratings and Fatigue Life for Ball Bearings

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

ANSI Z21.22/CSA 4.4 (2015; R 2020) Relief Valves for Hot Water Supply Systems

ANSI Z21.47/CSA 2.3 (2021) Gas-Fired Central Furnaces

AIR-CONDITIONING, HEATING AND REFRIGERATION INSTITUTE (AHRI)

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

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

ANSI/AHRI/CSA 310/380 (2014) Standard for Packaged Terminal Air-Conditioners and Heat Pumps

AHRI 340/360 I-P (2015) Performance Rating of Commercial and Industrial Unitary Air-Conditioning and Heat Pump Equipment

AHRI 365 (2009) Commercial and Industrial Unitary Air-Conditioning Condensing Units

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 (2020) 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

ASHRAE 33 (2016) Method of Testing Forced Circulation Air Cooling and Air Heating Coils

ASHRAE 52.2 (2012) Method of Testing General Ventilation Air-Cleaning Devices for Removal Efficiency by Particle Size

ASHRAE 62.1 (2022) Ventilation for Acceptable Indoor Air Quality

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

ASME B16.3 (2021) Malleable Iron Threaded Fittings, Classes 150 and 300

ASME B16.5 (2020) Pipe Flanges and Flanged Fittings NPS 1/2 Through NPS 24 Metric/Inch Standard

ASME B16.9 (2018) Factory-Made Wrought Buttwelding Fittings

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

ASME B16.18 (2021) Cast Copper Alloy Solder Joint Pressure Fittings

ASME B16.22 (2021) Wrought Copper and Copper Alloy Solder Joint Pressure Fittings

ASME B16.23 (2021) Cast Copper Alloy Solder Joint Drainage Fittings - DWV

ASME B16.26 (2018) Standard for Cast Copper Alloy Fittings for Flared Copper Tubes

ASME B16.34 (2021) Valves - Flanged, Threaded and Welding End

ASME B16.39 (2020) Standard for Malleable Iron Threaded Pipe Unions; Classes 150, 250, and 300

ASME B31.1 (2020) Power Piping

ASME B31.5 (2020) Refrigeration Piping and Heat Transfer Components

ASME BPVC SEC I (2017) BPVC Section I-Rules for Construction of Power Boilers

AMERICAN SOCIETY OF SANITARY ENGINEERING (ASSE)

ASSE 1003 (2020) Performance Requirements for Water Pressure Reducing Valves for Domestic Water Distribution Systems - (ANSI approved 2010)

ASTM INTERNATIONAL (ASTM)

ASTM A53/A53M (2022) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A106/A106M (2019a) Standard Specification for Seamless Carbon Steel Pipe for High-Temperature Service

ASTM A193/A193M (2020) Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service and Other Special Purpose Applications

ASTM A194/A194M (2022) 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 (2020) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM B32 (2020) Standard Specification for Solder Metal

ASTM B42 (2020) Standard Specification for Seamless Copper Pipe, Standard Sizes

ASTM B88 (2020) Standard Specification for Seamless Copper Water Tube

ASTM B117 (2019) Standard Practice for Operating Salt Spray (Fog) Apparatus

ASTM B280 (2020) Standard Specification for Seamless Copper Tube for Air Conditioning and Refrigeration Field Service

ASTM B306 (2020) Standard Specification for Copper Drainage Tube (DWV)

ASTM C916 (2020) Standard Specification for Adhesives for Duct Thermal Insulation

ASTM C1071 (2019) Standard Specification for Fibrous Glass Duct Lining Insulation (Thermal and Sound Absorbing Material)

U.S. DEPARTMENT OF ENERGY (DOE)

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

FOUNDATION FOR CROSS-CONNECTION CONTROL AND HYDRAULIC RESEARCH

(FCCCHR)

FCCCHR List (continuously updated) List of Approved Backflow Prevention Assemblies

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 13256-1 (2021) Water-Source Heat Pumps - Testing and Rating for Performance - Part 1:

Water-to-Air and Brine-to-Air Heat Pumps

ISO 13256-2 (2021 ) Water-Source Heat Pumps - Testing and Rating for Performance - Part 2:

Water-to-Water and Brine-to-Water Heat Pumps

MANUFACTURERS STANDARDIZATION SOCIETY OF THE VALVE AND FITTINGS

INDUSTRY (MSS)

MSS SP-58 (2018) Pipe Hangers and Supports - Materials, Design and Manufacture, Selection, Application, and Installation

MSS SP-67 (2022) Butterfly Valves

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

MSS SP-70 (2011) Gray Iron Gate Valves, Flanged and Threaded Ends

MSS SP-71 (2018) Gray Iron Swing Check Valves, Flanged and Threaded Ends

MSS SP-80 (2019) Bronze Gate, Globe, Angle and Check Valves

MSS SP-85 (2011) Gray Iron Globe & Angle Valves Flanged and Threaded Ends

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

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

NEMA MG 1 (2021) Motors and Generators

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 31 (2020) Standard for the Installation of Oil-Burning Equipment

NFPA 54 (2021) National Fuel Gas Code

NFPA 70 (2020; TIA 22-1; ERTA 1 2022) National Electrical Code

NFPA 90A (2021) Standard for the Installation of Air Conditioning and Ventilating Systems

NFPA 90B (2021) Standard for the Installation of Warm Air Heating and Air Conditioning Systems

NATIONAL ROOFING CONTRACTORS ASSOCIATION (NRCA)

NRCA 3740 (2005) The NRCA Waterproofing Manual

NRCA RoofMan (2020) The NRCA Roofing Manual

SHEET METAL AND AIR CONDITIONING CONTRACTORS' NATIONAL ASSOCIATION

(SMACNA)

SMACNA 1966 (2020) HVAC Duct Construction Standards Metal and Flexible, 4th Edition

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

UNDERWRITERS LABORATORIES (UL)

UL 1995 (2015; Reprint Aug 2022) UL Standard for Safety Heating and Cooling Equipment

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

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

UL 142 (2006; Reprint Jan 2021) UL Standard for Safety Steel Aboveground Tanks for Flammable and Combustible Liquids

UL 181 (2013; Reprint Dec 2021) UL Standard for Safety Factory-Made Air Ducts and Air Connectors

UL 296 (2017; Reprint Jan 2021) UL Standard for Safety Oil Burners

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

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

UL 726 (1995; Reprint Oct 2013) Oil-Fired Boiler Assemblies

UL 900 (2015) Standard for Air Filter Units

UL 1316 (2018) UL Standard for Safety Fiber Reinforced Underground Tanks for Flammable and Combustible Liquids

1.2 SYSTEM DESCRIPTION

Provide new and modify existing 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

Submit the following in accordance with Section 01 33 00 , "Submittal Procedures."

SD-02 Shop Drawings

Temperature control systems

Equipment layout drawings for:

SD-03 Product Data

Pipe hangers and supports

Flexible pipe connectors

Dampers

Filter boxes

Valves

Pipe and fittings

Pre-Fabricated Insulated Ductwork ; G

Dedicated Outside Air System ; G

SD-06 Test Reports

Dedicated Outside Air System ; G

SD-07 Certificates

Certification of welders' qualifications

Equipment field test plans

SD-08 Manufacturer's Instructions

Installation manual

SD-10 Operation and Maintenance Data

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

Dedicated Outside Air System ; G, Data Package 3

SD-11 Closeout Submittals

Air filter inventory

1.3.1 Temperature Control Systems

Drawings shall include point-to-point electrical wiring diagrams.

1.3.2 Equipment layout drawings

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

1.3.3 Installation Manual

Provide for each item of equipment.

1.3.4 Certification of Welders' Qualifications

Submit copy of Welder Qualification Tests (Form QW-482) prior to site welding.

1.3.5 Equipment Field Test Plans

Submit within 120 calendar days after contract award for the following equipment.

a. Dedicated outside air system

1.3.6 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 System

Provide single package unit factory assembled, designed and tested. Unit shall be ARI certified or rated in ARI UD 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, fixed core heat exchanger and controls. Provide heating section when indicated. Insulate interior of casing with manufacturer's standard insulation. Base structure shall be fully welded G-90, painted exterior, and have integral lifting lugs which can be removed once the unit is installed. All roof and side wall seams shall be positively sealed to prevent water and air leakage. The OA and EA compartment shall have drains extended to exterior of unit.

2.1.1.1 Housing

Unit shall be constructed for outdoor installation on a concrete pad.

Housing may be constructed of Thermo-Composite Panels or painted galvanized sheet metal.

2.1.1.1.1 Thermo-Composite Panels

a. The unit housing shall be no-through metal with 2 Thermo-Composite and foam panel construction - interior and exterior. No-through metal construction will be inherent to all the component construction in the assembly.

b. All panels and access doors shall be double wall construction with R14 foam insulation for every 2 inches of construction.

c. Unit casing will have no exterior condensation at interior AHU temperatures down to 43F while unit exterior conditions are maintained at 95 F dry bulb / 85 F wet bulb.

d. Unit shall be completely factory assembled and shipped in one piece.

d. The panels shall be tested in accordance with SMACNA and ASHRAE 111 to have a deflection of no more than L/1150 at 10 and withstand air pressures up to 8 w.c with less than 1% leakage.

Fire resistance of the panel will be in compliance with UL 94 rated at 5VA; and a flame spread / smoke development in compliance with UL 723 ASTM E84 Class 1 rating.

e. Thermo-Composite panels shall be provided for the entire unit construction, including but not limited to, walls, doors, floors, roof, interior partitions, and electrical compartment. Panels shall be non-load bearing type.

f. The frame shall consist of anodized extruded aluminum profiles which incorporates a thermally broken construction; welded together for reinforcement and insulated for superior thermal performance.

g. Base structure shall be fully welded G-90, painted exterior, and have integral lifting lugs which can be removed once the unit is installed.

h. All roof and side wall seams shall be positively sealed to prevent water and air leakage. The OA and EA compartment shall have 1 in.

PVC drains extended to exterior of unit.

i. Access doors shall be provided to all major components to facilitate quick and easy access. Access doors will be made from the same material as the unit casing and shall incorporate thermal break construction. Fan access door(s) shall have Allegis type handles, with one handle interlinking multiple latches and threaded insert fastening handles for all remaining doors. If access doors do not open against unit operating pressure, provide safety latches that allow access doors to partially open after first handle movement and fully open after second handle movement. Removable panels provided for equipment pull out for coil(s), and air to air heat exchanger section(s) shall have key tooled threaded insert fasteners. Hinges shall be Nylon hinge type designed to open 180 degrees.

g. Unit shall have the entire exterior finished with a PVDF coating designed for UV resistance. Panels shall be painted manufacturer's standard color. Panels shall pass ASTM B117 3000-hour salt fog resistance test and ASTM D4585 3000-hour moisture condensation resistance test. In addition, paint must meet AAMA 620-02 standard for color, chalking, gloss retention, and abrasion resistance.

2.1.1.1.2 Painted Metal

a. Exterior panels shall be painted galvanized steel with minimum R13 injected foam insulation and galvanized steel liner.

2.1.1.1.3 Weather Hoods

The outdoor intake weather hood shall be completely constructed in aluminum. The hood shall ship loose for field installation by the installing contractor. The outdoor air hood shall be designed with a 4 extruded aluminum louver, bird screen and a plenum enclosure with drain holes. The louver blades shall be drainable type with a maximum 45 degree angle and curved with integral rain baffle. The louver design shall not allow more than 0.03 oz/ft2 water penetration when tested in accordance to AMCA 500. The pressure drop of the complete hood assembly shall not exceed 0.05 wc at a maximum 500 fpm face velocity. A Pre-filter rack system shall be installed within the weather hood enclosure. Filter access in the hood shall be accomplished via the louver that is installed with a stainless steel piano hinge and spring loaded latch.

2.1.1.1.4 Exhaust Air Louver

The exhaust air outlet louvers shall be 2 in. extruded aluminum, with non-restricting blade design and bird screen.

2.1.1.1.5 Access Doors

Access doors shall be provided to all major components to facilitate quick and easy access. Access doors will be made from the same material as the unit casing and shall incorporate thermal break construction. Fan access door(s) shall have Allegis type handles, with one handle interlinking multiple latches and threaded insert fastening handles for all remaining doors. If access doors do not open against unit operating pressure, provide safety latches that allow access doors to partially open after first handle movement and fully open after second handle movement.

Removable panels provided for equipment pull out for coil(s), and air to air heat exchanger section(s) shall have key tooled threaded insert fasteners. Hinges shall be designed to open 180 degrees.

2.1.1.2 Heat Recovery Fixed Plate

2.1.1.2.1 Enthalpy Plate Heat Exchangers

a. The enthalpy plate energy exchanger shall transfer both sensible and latent energies between outgoing and incoming air streams in a cross flow arrangement.

b. The enthalpy plate exchanger media shall be impregnated with a polymeric desiccant.

c. The hydroscopic polymer shall exchange water by direct vapor transfer using molecular transport without the need of condensation.

d. The plate exchanger shall be constructed of alternate layers of corrugated open mesh aluminum material and polymeric desiccant impregnated media.

e. The enthalpy plate exchanger design shall minimize pressure drop and optimize energy transfer.

f. The enthalpy plate exchanger core shall be assembled into a strong, self-supporting frame made of aluminum corner extrusions and 16 gauge aluminum end plates.

g. The corners of enthalpy plate exchanger shall be sealed with a 2 components casting resin. The exchanger shall be silicone free.

h. The aluminum corner extrusions shall be hollow to accept mounting screws and shall provide a 45 corner support angle.

i. The enthalpy plate exchanger shall operate at temperatures between -40F and 140F.

j. The enthalpy plate exchanger shall withstand, without more than 10 % increase of pressure drop, pressure differentials of at least 5 w.g.. It shall withstand pressure differential of 10 w.g. without permanent deformation.

k. The enthalpy plate exchanger shall bear the AHRI 1060 I-P Certified Product Seal. Sensible, latent and total effectiveness along with pressure drop, EATR and OACF rating shall be clearly documented with performance tests conducted in accordance with ASHRAE Standard 84-91 and per the official AHRI laboratory.

l. Bacteria & mold resistance: The membrane shall not promote the growth of mold or bacteria and must have successfully passed AATCC30-2013 with no growth of Aspergillus Niger observed after 14 days.

m. Longevity test (frosting/defrosting cycles): The exchanger must have successfully passed 1920 frosting/defrosting cycles with less than 10% change of its performance.

2.1.1.3 Fans

Wall mounted, direct driven plenum fans (horizontal or vertical) shall be installed with perimeter gasketed isolation.

a. Fans shall be direct drive radial centrifugal fans with free running impeller. Fans shall be compact, optimized and construction made of galvanized sheet steel with backward curved 7-blade high efficiency impeller, protected by an epoxy powder coating

b. The impeller shall be balanced with hub to an admissible vibration severity of less than 2.8 mm/s in conformity with DIN ISO 14694 and proof shall be supplied for each individual impeller. Tests shall be made according to DIN ISO 1940 Part 1, quality of balancing G2.5/6.3

c. The single inlet shall be mounted onto constant speed direct drive motor, equipped with an air flow optimized inlet cone from galvanized sheet steel

d. Fans shall be certified as per ISO 5801 and in accordance to AMCA standards.

e. Fan/ fan bank will require to be operated by a Variable speed drive.

f. Plenum fan shall come equipped with guard grilles for the air intake side.

2.1.1.4 Fan Motors

a. The fan motors shall meet NEMA standard dimensions and comply with the Energy policy Act of 1997.

b. Motors shall have premium efficiencies with low noise and vibration output. Motors shall be certified and built in accordance to ISO 9001 quality control system.

c. Motors shall have ODP enclosure with Premium efficiency performance.

d. Units shall be designed for constant application. Please refer to the unit schedule for the application type.

e. A shaft grounding brush kit will be provided to prevent electrical damage to motor bearings by safely channeling harmful shaft currents to ground.

2.1.1.5 Variable Frequency Drive

VFDs will be used to set or regulate the fan speed and airflow for these units.

a. The VFD shall have PID function for constant flow applications.

b. The VFDs will be installed with integral brake transistor, overload protection, and adjustable pulse-width modulation (PWM).

c. The VFD shall use Insulated Gate Bipolar Transistor (IGBT) technology to convert three phase input power to coded PWM output and have 4-20mA analog output terminals that are fully programmable for variable flow applications.

d. The VFD shall be equipped with a keypad with status indicators, easy access functions, and monitoring functions during motor operation.

e. In the event of a momentary power failure or fault the VFD shall read the inverter speed and direction of a coasting motor and shall automatically restart the motor smoothly.

f. VFDs will be installed with bypass.

2.1.1.6 Pre-Filters

Filters shall be installed upstream of the heat exchanger and coils, in both airstreams. The filters shall be MERV 8. Each filter shall consist of 100% synthetic media, expanded metal on the downstream and enclosing with high wet-strength beverage board with diagonal support bonded on air entering and air exiting side of each pleat. Filters shall be placed in a completely sealed, galvanized holding frame.

2.1.1.7 Final Filters

Final filters shall be MERV 13. Each filter shall consist of 100% high lofted ultrafine synthetic media, in a galvanized steel frame with header, diagonal support bracing, contour stabilizers and metal media support grid. Media is adhesively bonded to all four sides of the frame. Filters shall be placed in a completely sealed, galvanized holding frame.

2.1.1.8 Dampers

Dampers shall be installed included with unit and of seacoast design.

Dampers shall be low leak type with rubber edges, opposed blades, and constructed from extruded aluminum. The exhaust air outlet shall have a standard aluminum gravity type damper. Dampers shall be installed in the compartments with linkage rod for actuators. Actuators shall be 24V factory installed: two-position. All actuators shall have spring return mechanism and auxiliary switches. Dampers will be installed in the failed close positions unless otherwise noted.

2.1.1.9 Condensing Unit

Provide an integral air cooled condensing section with variable speed compressors. The condensing section shall be factory piped, wired, and charged with R-32 or R-545B refrigerant. The section shall be from the same manufacturer as the air handling unit. Factory mounting and piping an air cooled condensing unit, provided by a third party is not acceptable.

Furthermore, the exterior cabinet of the air cooled section shall be of the same construction and paint color as the air handling unit.

a. Compressors shall be variable speed scroll type that can modulate from 30% to 100% capacity per compressor. Variable capacity compressors which do not modulate the speed of the scrolls are not considered equal to a variable speed scroll since they consume more energy at the same capacity output. Mechanically stepped scrolls which are unloaded via a digital signal to a solenoid valve, in a timed sequence, will not be acceptable for this application. The variable speed scrolls shall be operated via a factory supplied variable speed controller per compressor, and all tandem compressors will modulate in unison. Using a single variable speed controller on the lead circuit alone is not efficient during part load conditions, therefore will not be acceptable for this application. Each compressor and controller assembly shall be equipped with the following features: PERMANENT MAGNET MOTOR, electronic expansion valve, a crankcase heater function, anti-short cycling, built-in phase loss detector, EMC filter, oil return management system, and reverse rotation protection. All refrigeration parts, including the compressor and the speed controller will be located in a closed and vented service compartment, separate from the condenser coil airflow.

Compressors located in compartments open to the outside are not acceptable. Compressors shall be mounted on rubber isolators to limit vibration transmission and shall include flexible hoses on both the suction and discharge refrigeration lines.

b. All air cooled condensing units above 18 tons will have a minimum of two compressors.

c. Condenser fans shall have 7 air foil type blades with external mounted asynchronous motors that are class F insulated, IP54 and 100% variable speed. Each condenser fan bank shall be provided with a variable voltage controller which modulates via refrigerant head pressure control for superior part load performance. All the condenser fans in a fan bank shall modulate in unison for each respective circuit. Staging condenser fans are not an acceptable mode of control for head pressure control. Protective guards shall be included on all condenser fans, and condenser coils. The coil protective guards shall be ideal to keep coil at maximum operating performance, protect the condenser from hail damage and allow for easy cleaning with quick release latches. The condenser coils shall be micro-channel design for maximum efficiency performance, consist of a single pass arrangement with integral receiver, and be pressure tested at 650 psig. Coil construction shall consist of aluminum alloys for the fins, tubes and manifolds. Copper tube, aluminum fin condenser coils are not also acceptable as they require more refrigeration charge for the same capacity output .

d. The following components shall be included in each refrigeration circuit: Liquid line filter dryer, hi and low pressure switch, hi and low pressure transducers, suction and liquid lines shutoff valves and suction line accumulators. In addition, refrigeration piping must use Shrader type connections for all components, including but not limited to valves and transducers. Under no circumstances shall the units leave the factory without a complete run test and a copy of the QC report shall be provided upon request.

2.1.1.10 Coils

Coils shall be factory installed in the unit.

2.1.1.10.1 DX Coils

a. Coils shall be designed with respective circuits to match the design requirements. All coils shall have a distributor per circuit connection. Coils shall be circuited for counter-flow heat transfer to provide maximum mean effective temperature difference for maximum heat transfer rates.

b. Primary surface shall be round seamless copper tube staggered in the direction of airflow. Secondary surface shall consist of rippled aluminum plate fins for higher capacity and structural strength. Fins shall have full drawn collars to provide a continuous surface cover over the entire tube for maximum heat transfer. Tubes shall be mechanically expanded into the fins to provide a continuous primary to secondary compression bond over the entire finned length for maximum heat transfer rates. Headers shall have intruded tube holes to provide a large brazing surface for maximum strength and inherent flexibility.

c. Casing shall be constructed of continuous galvanized steel.

d. The complete coil shall be tested with 315 pounds air pressure under warm water and be suitable for operation at 250 psig working pressures. Maximum finned coil height shall be 60" and shall not exceed 500 FPM face velocity.

e. Drain pan shall be provided on cooling coils. Cooling coils shall sit on stainless steel tubular support rails, which shall stand a minimum of (2) two inches above the highest point of the floor drain pan. Stacked coils shall be provided for larger airflows and intermediate drain pans shall be provided for each coil bank.

Drain pans shall be stainless steel with 1.25" stainless steel drain connections on one side only. Pan shall be sloped in two planes.

f. All coils shall be rated in accordance with AHRI standard 410.

2.1.1.10.2 DX Hot Gas Reheat

a. The hot gas reheat coil shall be installed at minimum 8" from the moisture producing DX cooling coil. A Plexiglas panel between the two items shall be required to visually inspect the DX cooling coil surface area, and also have the ability to clean the coils when necessary.

b. A modulating valve shall be provided to control air leaving temperature for dehumidification.

c. Coils shall be designed with respective circuits to match the design requirements. Coils shall be circuited for counter-flow heat transfer to provide maximum mean effective temperature difference for maximum heat transfer rates.

d. Primary surface shall be round seamless copper tube staggered in the direction of airflow. Secondary surface shall consist of rippled aluminum plate fins for higher capacity and structural strength. Fins shall have full drawn collars to provide a continuous surface cover over the entire tube for maximum heat transfer. Tubes shall be mechanically expanded into the fins to provide a continuous primary to secondary compression bond over the entire finned length for maximum heat transfer rates. Headers shall have intruded tube holes to provide a large brazing surface for maximum strength and inherent flexibility.

e. Casing shall be constructed of continuous galvanized steel.

f. The complete coil shall be tested with 315 pounds air pressure under warm water and be suitable for operation at 250 psig working pressures.

g. All coils shall be rated in accordance with AHRI standard 410.

2.1.1.11 Power and Safety Control

The power and control center shall be integral to the unit housing and rated equivalent to NEMA 3R.

a. Under no circumstances shall any wiring or parts be field installed. If units show up at the job site without wiring by the manufacturer, the contractor will have to send back units to the manufacturer at the contractors' expense to get them factory wired and re-tested.

b. Panels that are externally mounted to the unit shall not be accepted, regardless of the NEMA rating they may have. A separate access door shall be provided with an approved locking device.

c. All electrical components contained in the panel shall be UL/CSA certified and labeled. The unit shall be complete with VFDs, fuses, relays, phase protection for compressorized units, terminals for main ON/OFF and step-down transformer. All components shall be factory wired for single point power connection by the manufacturer of the unit. A non-fused safety disconnect switch shall be factory installed for ON/OFF servicing.

d. An electrical pipe chase for power and control feeding shall be provided next to the control panel.

e. Any power or control wiring that is field installed shall not be accepted under any circumstances. The Short Circuit Current Rating (SCCR) is 5 kA rms symmetrical, 600V Maximum or as noted on schedule.

f. GFI, lights, and switches shall be factory installed and wired to a common junction box. A separate power connection 120V/1 will be required.

2.1.1.12 Air Temperature Control Package

The unit shall be delivered with factory installed control system. Under no circumstances shall control be provided by other than the manufacturer of the equipment. Field installed control package by the ATC will not be acceptable.

a. The control system shall consist of a microprocessor with LCD display, 7 day time clock, 20 day holiday schedule, occupied/unoccupied mode switch, warm up mode, cool down mode, hi-lo limit discharge control, fan status, temperature and humidity sensors when applicable, scroll buttons to change settings as required and alarm history.

b. Supply air temperature and humidity sensors shall be provided by equipment manufacturer and field mounted in the supply duct and wired by DDC contractor.

c. All electrical components contained in the panel shall be UL/CSA certified and labeled. The unit shall be complete with VFDs, fuses, relays, phase protection for compressorized units, terminals for main ON/OFF and step-down transformer. All components shall be factory wired for single point power connection by the manufacturer of the unit. A non-fused safety disconnect switch shall be factory installed for ON/OFF servicing.

d. Communication Interface Card: The microprocessor shall be capable of communicating with the following protocol language: BACnet

MS/TP RS-485.

2.1.1.13 Accessories

a. Door interlocking switch (for fan section).

2.2 ELECTRICAL

2.2.1 Electrical Motors, Controllers, Contactors, and Disconnects

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

2.2.2 Electrical Work

Provide under Section 26 20 00 , "Interior Wiring Systems." Provide control wiring under Section 23 09 00 Instrumentation and Control for

HVAC.

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 whereindicated 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 ductinsulation with bearings at both ends of the shafts. Provide adjustmentquadrant with indicator and locking devices. Provide galvanized steeldampers one gage heavier than duct in which dampers are installed.

Provide automatic dampers under Section 23 09 00 Instrumentation and Control for HVAC.

2.3.4 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.

2.3.5 Filter Boxes

Provide when filters are not provided integral with the air-conditioning units or air-handling units. Construct filter boxes of zinc-coated steel with track, hinged access doors with latches, seal gaskets between frame, and filters. Arrange filters to filter outside air intake and return air. Filter assemblies shall be removable from filter box and replaceable without use of tools. Replaceable filter rack shall be designed to accept 2 inch thick filters.

a. Replaceable filters: Provide UL listed throwaway 1 inch thick fiberglass filters, standard dust-holding capacity, 350 fpm maximum face velocity.

b. High efficiency filters: Provide UL Class 2, mean efficiency of 30 percent when tested in accordance with ASHRAE 52.2 . Filter assembly shall include holding frame and fastener assembly, filter cartridge, and mounting frame and retainer assembly. High efficiency filters shall be preceded by replaceable filter.

2.3.6 Pre-Fabricated Insulated Ductwork

Outdoor Installations: Provide double layered (total 50 mm thick minimum), 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 1709. Ductwork shall be fabricated per "SMACNA HVAC Phenolic Duct Construction Standards." Duct shall be fabricated not to pond water.

2.4 PIPING SYSTEMS

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

2.4.1 Soldered Joint Copper Tubing

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

Provide manufactured tee for installing flow switches, pressure guages, thermometers, pressure and temperature ports and similar devices. Sweat or brazed manifolds, T-Drilling and drawn/extruded collars are not permitted to be used.

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

b. Cold drain piping from drain pans.

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

2.4.3 Copper Cold Drain Piping

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

2.4.4 Steel Piping Systems

Provide steel piping for the following piping systems.

a. Steam and condensate piping.

b. Fuel oil vent, and fill piping.

c. Gas piping.

2.4.4.1 Steel Pipe

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

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

2.4.4.2 Steel Pipe Fittings

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

2.4.4.3 Steel Pipe Unions

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

2.4.4.4 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.

2.4.4.5 Direct Buried Steel Piping

Provide pipe and fittings with exterior coal tar epoxy painting system.

2.4.5 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.

2.4.5.1 Check Valves

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

2.4.5.2 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.

2.4.5.3 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.

2.4.5.4 Square Head Cocks

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

2.4.5.5 Combination Pressure and Temperature Relief Valves

ANSI Z21.22/CSA 4.4 , copper alloy body, automatic reseating, test lever, and discharge capacity based on AGA temperature steam rating.

2.4.5.6 Refrigerant Valves

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

ASHRAE 15 & 34 .

2.5 PIPING ACCESSORIES

2.5.1 Pipe Hangers and Supports

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

2.5.2 Strainers

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

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

2.5.3 Traps

Provide traps of the types indicated with stainless steel internals.

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

2.5.4 Thermometers

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

2.5.5 Pipe Sleeves

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

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

2.5.5.1 Sleeves in Masonry and Concrete

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

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

2.5.5.2 Sleeves not in Masonry and Concrete

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

2.5.6 Flexible Pipe Connectors

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

2.5.7 Escutcheon Plates

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

2.6 PROGRAMMABLE THERMOSTATS

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

a. Low voltage

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

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

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

e. Installation shall include initial programming

f. Temporary temperature override

g. Display clock

h. Display shall prompt for program modifications, or functions of buttons shall be self evident, or instructions shall be permanently mounted on inside of flip down keyboard cover.

Thermostat shall be capable of being completely programmed without the use of separate instructions.

PART 3 EXECUTION

3.1 INSTALLATION

3.1.1 HVAC System

Installation of HVAC system including equipment, materials, installation, workmanship, fabrication, assembly, erection, examination, inspection, and testing shall be in accordance with ASME B31.1 , ASME B31.5 , NFPA 70 , and in accordance with the manufacturer's recommendations.

3.1.2 Connections to Existing Systems

Notify the Contracting Officer in writing at least 15 calendar days prior to the date the connections are required. Obtain approval before interrupting service. Furnish materials required to make connections into existing systems and perform excavating, backfilling, compacting, and other incidental labor as required. Furnish labor and tools for making actual connections to existing systems.

3.2 PIPING

Test, inspect, and approve piping before burying, covering, or concealing. Provide fittings for changes in direction of piping and for connections. Make changes in piping sizes through tapered reducing fittings; bushings will not be permitted. Install valves with stems horizontal or above. Provide flanges or unions at valves, traps, strainers, and connections to equipment; unions are not required in copper tubing piping systems.

a. Threaded connections: Provide Teflon pipe thread paste on male threads. Do not thread metal pipe into plastic piping.

b. Pipe hangers and supports: Provide additional pipe hangers and supports at in-line water pumps and flanged valves.

c. Piping to receive insulation: Provide temporary wood spacers between the pipe hangers and supports, and the pipe in order to properly slope the piping and establish final elevations. Provide temporary wood spacers of same thickness as insulation to be provided under Section 23 09 00 , "Thermal Insulation For Mechanical Systems." Support plastic piping every 4 feet.

Support metal piping as follows.

MAXIMUM SPACING (FEET)

Nominal Pipe One and Size (inches) under 1.25 1.5 2 2.5 3 3.5 4 5 6

Copper Tubing 6 7 8 8 9 10 11 12 13 14

Steel Pipe 7 8 9 10 11 12 13 14 16 17

d. Cleaning of piping: Keep interior and ends of new piping and existing piping affected by Contractor's operations, cleaned of water and foreign matter during installation by using plugs or other approved methods. When work is not in progress, securely close open ends of pipe and fittings to prevent entry of water and foreign matter. Inspect piping before placing into position.

e. Demolition: Remove materials so as not to damage materials which are to remain. Replace existing work damaged by Contractor's operations with new work of same construction.

f. Tee Joints: Extracted tee joints may be made in copper tube.

Make joint with an appropriate tool by drilling a pilot hole and drawing out the tube surface to form a collar having a minimum height of three times the thickness of the tube wall. To prevent the branch tube from being inserted beyond the depth of the extracted joint, provide dimpled depth stops. Notch the branch tube for proper penetration into fitting to assure a free flow joint. Braze extracted joints using a copper phosphorous classification brazing filler metal. Soldered joints shall not be permitted.

3.3 ADJUSTMENTS

Adjust controls and equipment so as to give satisfactory operation.

Adjust entire water temperature control system and place in operation so that water quantities circulated are as indicated. Air duct systems shall be adjusted and balanced so that air quantities at outlets are as indicated and so that distribution from supply outlets is free from drafts and has uniform velocity over the face of each outlet.

3.4 INSTRUCTING OPERATING PERSONNEL

Upon completion of work and at time…