A0002 SPEC 23 81 47.pdf

FORT EUSTIS AIT BARRACKS PH4 794AITPH4

AMENDMENT 0002

SECTION 23 81 47

WATER-LOOP AND GROUND-LOOP HEAT PUMP SYSTEMS

08/08

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 within the text by the basic designation only.

AMERICAN SOCIETY OF HEATING, REFRIGERATING AND AIR-CONDITIONING

ENGINEERS (ASHRAE)

ASHRAE 52.1 (1992; Interpretation 1 2007) Gravimetric and Dust-Spot Procedures for Testing Air-Cleaning Devices Used in General Ventilation for Removing Particulate Matter

ASHRAE FUN IP (2017) Fundamentals Handbook, I-P Edition

ASHRAE Item 90376 (1997) Ground-Source Heat Pumps, Design of Geothermal Systems for Commercial and Institutional Buildings

ASME INTERNATIONAL (ASME)

ASME B31.5 (2016) Refrigeration Piping and Heat Transfer Components

ASME B31.9 (2014) 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 A653/A653M (2018) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

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

ASTM D3892 (1993; R 2009) Packaging/Packing of Plastics

ASTM F402 (2005; R 2012) Safe Handling of Solvent Cements, Primers, and Cleaners Used for Joining Thermoplastic Pipe and Fittings

INTERNATIONAL GROUND SOURCE HEAT PUMP ASSOCIATION (IGSHPA)

IGSHPA 21010 (1991) Grouting Procedures for

SECTION 23 81 47 Page 1

Ground-Source Heat Pump Systems

IGSHPA 21015 (2000) Grouting for Vertical GHP Systems

IGSHPA 21020 (1988) Closed-Loop/Ground-Source Heat Pump System/Installation Guide

IGSHPA 21030 (2005) Design and Installation Standards

IGSHPA 21060 (1989) Soil and Rock Classification Field Manual

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 13256-1 (1998) Water-Source Heat Pumps - Testing and Rating for Performance - Part 1:

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

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA MG 1 (2016; SUPP 2016) Motors and Generators

NEMA MG 11 (1977; R 2012) Energy Management Guide for Selection and Use of Single Phase Motors

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 704 (2017) Standard System for the Identification of the Hazards of Materials for Emergency Response

U.S. NATIONAL ARCHIVES AND RECORDS ADMINISTRATION (NARA)

29 CFR 1910 Occupational Safety and Health Standards

UNDERWRITERS LABORATORIES (UL)

UL 94 (2013; Reprint Sep 2017) UL Standard for Safety Tests for Flammability of Plastic Materials for Parts in Devices and Appliances

1.2 SYSTEM DESCRIPTION

Provide newwater-loop heat pump systems complete and ready for operation. Systems include heat pumps, system equipment, piping, pumps, electrical equipment, controls, and condenser. Installation of water-loop heat pump systems including equipment, materials, installation, workmanship, fabrication, assembly, erection, examination, inspection, and testing shall be in accordance with ASME B31.9 , ASME B31.5 , ASHRAE FUN IP , IGSHPA 21010 , IGSHPA 21015 , IGSHPA 21020 , IGSHPA 21030 , IGSHPA 21060 , NFPA 70 , and ASHRAE Item 90376 as supplemented and modified by this

SECTION 23 81 47 Page 2 section.

1.3 RELATED REQUIREMENTS

Requirements for cooling towers are specified in Section 23 65 00COOLING

TOWERS AND REMOTE EVAPORATIVELY-COOLED CONDENSERS.

Requirements for metal duct systems are specified in Section 23 00 00 AIR

SUPPLY, DISTRIBUTION,.VENTILATION, AND EXHAUST SYSTEMS.

1.4 SUBMITTALS

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

submittals not having a "G" designation are for Contractor Quality Control approval. Submittals with an "S" are for inclusion in the Sustainability eNotebook, in conformance to Section 01 33 29 SUSTAINABILITY REPORTING.

Submit the following in accordance with Section 01 33 00 SUBMITTAL

PROCEDURES:

SD-03 Product Data

Product data for integral or appurtenant space temperature controls (STC) supplied with the listed equipment shall include shall include point-to-point electrical wiring diagrams for each

STC.

Water-Source Water-to-Air Heat Pumps; G

Water-Source Water-to-Water Heat Pumps; G

Refrigerants - Provide MSDS Sheets for All Refrigerants

Plate Heat Exchangers; G

Heat Tape; G

Pumps; G

Pipe, Fittings, and Piping Components; G

Expansion Tanks; G

Air Separators; G

SD-06 Test Reports

Water-Source Water-To-Air Heat Pumps - Field Acceptance Test Plan;

G

Water-Source Water-To-Water Heat Pumps - Field Acceptance Test Plan;

G

Plate Heat Exchangers - Field Acceptance Test Plan; G

Water-Source Water-To-Air Heat Pumps - Field Acceptance Test Report;

G

SECTION 23 81 47 Page 3

Water-Source Water-To-Water Heat Pumps - Field Acceptance Test Report; G

Plate Heat Exchangers - Field Acceptance Test Report; G

SD-07 Certificates

Employer's record documents

ARI/ISO Performance Data For Water Source Heat Pumps; G

Hydrostatic Test; G

SD-08 Manufacturer's Instructions

Water-Source Water-To-Air Heat Pumps - Installation Instructions

Water-Source Water-To-Water Heat Pumps - Installation Instructions

Plate Heat Exchangers - Installation Instructions

ON-SITE TRAINING; G

SD-10 Operation and Maintenance Data

Water-source water-to-air heat pumps, Data Package 2; ; G

Water-source water-to-water heat pumps, Data Package 2; ; G

Plate Heat Exchangers, Data Package 2; ; G

Submit in accordance with Section 01 78 23 OPERATION AND

MAINTENANCE DATA.

SD-11 Closeout Submittals

As-Built Drawings; G

Energy Efficient Equipment for Water Source Heat Pump Systems Closed-loop Heat Pump Systems; S

Ozone Depleting Substances; S

Indoor Air Quality During Construction; S

1.5 QUALITY ASSURANCE

1.5.1 Material and Equipment Qualifications

Provide materials and equipment that are standard products of manufacturers regularly engaged in the manufacture of such products, which are of a similar material, design and workmanship. Standard products shall have been in satisfactory commercial or industrial use for 2 years prior to bid opening. The 2-year use shall include applications of equipment and materials under similar circumstances and of similar size.

The product shall have been for sale on the commercial market through advertisements, manufacturers' catalogs, or brochures during the 2 year period.

SECTION 23 81 47 Page 4

1.5.2 Alternative Qualifications

Products having less than a two-year field service record will be acceptable if a certified record of satisfactory field operation for not less than 6000 hours, exclusive of the manufacturer's factory or laboratory tests, can be shown.

1.5.3 Service Support

The equipment items shall be supported by service organizations. Submit a certified list of qualified permanent service organizations for support of the equipment which includes their addresses and qualifications. These service organizations shall be reasonably convenient to the equipment installation and able to render satisfactory service to the equipment on a regular and emergency basis during the warranty period of the contract.

1.5.4 Manufacturer's Nameplate

Each item of equipment shall have a nameplate bearing the manufacturer's name, address, model number, and serial number securely affixed in a conspicuous place; the nameplate of the distributing agent will not be acceptable. As applicable the ENERGY STAR label also affixed to the equipment.

1.5.5 Modification of References

In each of the publications referred to herein, consider the advisory provisions to be mandatory, as though the word, "shall" had been substituted for "should" wherever it appears. Interpret references in these publications to the "authority having jurisdiction", or words of similar meaning, to mean the Contracting Officer.

1.5.5.1 Definitions

For the International Code Council (ICC) Codes referenced in the contract documents, advisory provisions shall be considered mandatory, the word "should" shall be interpreted as "shall." Reference to the "code official" shall be interpreted to mean the "Contracting Officer."

References to the "permit holder" shall be interpreted to mean the "Contractor."

1.5.5.2 Administrative Interpretations

For ICC Codes referenced in the contract documents, the provisions of Chapter 1, "Administrator," do not apply. These administrative requirements are covered by the applicable Federal Acquisition Regulations (FAR) included in this contract and by the authority granted to the Officer in Charge of Construction to administer the construction of this project. References in the ICC Codes to sections of Chapter 1, shall be applied appropriately by the Contracting Officer as authorized by his administrative cognizance and the FAR.

1.5.6 System Diagrams

After completion, but before final acceptance, submit System diagrams that show the layout of equipment, piping, and circulation pumps, and typed condensed operation manuals explaining preventative maintenance procedures, methods of checking the system for normal, safe operation, and

SECTION 23 81 47 Page 5 procedures for safely starting and stopping the system shall be framed under glass or laminated plastic. After approval, these items shall be posted where directed.

1.6 DELIVERY, STORAGE, AND HANDLING

Materials delivered and placed in storage shall be stored with protection from the weather, excessive humidity variation, excessive temperature variation, dirt, dust and/or other contaminants. Proper protection and care of material before, during and after installation is the Contractor's responsibility. Any material found to be damaged shall be replaced at the Contractor's expense. During installation, piping shall be capped to keep out dirt and other foreign matter. A material safety data sheet in conformance with 29 CFR 1910 Section 1200(g) shall accompany each chemical delivered for use in pipe installation. At a minimum, this includes all solvents, solvent cements, glues and other materials that may contain hazardous compounds. Handling shall be in accordance with ASTM F402.

Storage facilities shall be classified and marked in accordance with NFPA 704 . Materials shall be stored with protection from puncture, dirt, grease, moisture, mechanical abrasions, excessive heat, ultraviolet (UV) radiation damage, or other damage. Pipe and fittings shall be handled and stored in accordance with the manufacturer's recommendation. Plastic pipe shall be packed, packaged and marked in accordance with ASTM D3892. Upon delivery of piping, fitting, components, and equipment to the site, inspect items for damage and verify items meet project requirements.

1.7 SAFETY REQUIREMENTS

Exposed moving parts, parts that produce high operating temperature, parts which may be electrically energized, and parts that may be a hazard to operating personnel shall be insulated, fully enclosed, guarded, or fitted with other types of safety devices. Safety devices shall be installed so that proper operation of equipment is not impaired.

1.8 PROJECT/SITE CONDITIONS

1.8.1 Verification of Dimensions

The Contractor shall become familiar with all details of the work, verify all dimensions indicated in the field, and advise the Contracting Officer of any discrepancy before performing any work.

1.8.2 Drawings

Because of the small scale of the drawings, it is not possible to indicate all offsets, fittings, and accessories that may be required. The Contractor shall carefully investigate the plumbing, fire protection, electrical, structural and finish conditions that would affect the work to be performed and shall arrange such work accordingly, furnishing required offsets, fittings, and accessories to meet such conditions.

1.8.3 Accessibility

Install all work so that parts requiring periodic inspection, operation, maintenance, and repair are readily accessible. Install concealed valves, expansion joints, controls, dampers, and equipment requiring access, in locations freely accessible through access doors.

SECTION 23 81 47 Page 6

1.9 COORDINATION OF WORK AND SYSTEM PERFORMANCE

a. Pump supports, piping offsets, fittings, and any other accessories required shall be furnished as required to provide a complete installation and to eliminate interference with other construction.

PART 2 PRODUCTS

2.1 PRODUCT SUSTAINABILITY CRITERIA

For products in this section, where applicable and to extent allowed by performance criteria, provide and document the following:

2.1.1 Energy Efficient Equipment for Water Source Heat Pump Systems

Provide water source heat pump systems meeting the efficiency requirements as stated within this section and provide documentation in conformance with Section 01 33 29 SUSTAINABILITY REPORTING paragraph ENERGY EFFICIENT

EQUIPMENT.

2.1.2 Ozone Depleting Substances

Water source heat pump systems must not use CFC-based refrigerants, and must have an Ozone Depletion Potential (ODP) no greater than 0.0, with exception to R-123, in conformance with this section. Provide documentation in conformance with Section 01 33 29 SUSTAINABILITY REPORTING paragraph OZONE DEPLETING SUBSTANCES.

2.2 EQUIPMENT

Equipment using CFC-based refrigerants, or refrigerants with ozone depleting potential (ODP) greater than 0.0 will not be permitted.

2.2.1 Water-Source Water-to-Air Heat Pumps (WAHP)

Provide water-source water-to-air heat pump units factory assembled, designed, tested, and rated in accordance with ISO 13256-1 . Units shall be ISO 13256-1 certified, or listed in ISO 13256-1 directory. Units shall include fans, refrigerant-to-air heat exchangers, filters, dampers, compressor, reversing valve, expansion valve, refrigerant-to-water heat exchangers, desuperheater, hose kits, bypass for flushing and purging, pump module, and controls. A permanent label shall be affixed to each heat pump unit indicating basic information for that unit. The information shall include: nominal flow rate gpm, pressure drop feet, temperature drop/rise degree F, and capacity Btu/hr. Provide certificates of ARI/ISO Performance Data For Water Source Heat Pumps.

a. Cabinet: Provide manufacturer's standard galvanized steel cabinet finished with corrosion resistant epoxy coating or lacquer acrylic.

Provide access panels for inspection and access to internal parts.

Insulate cabinet with minimum 1/2 inch multi-density, fiberglass insulation with exposed edges sealed or tucked under flanges to prevent introduction of fibers into the airstream. Female threaded pipe condensate drain connections, supply water connections, and return water connections shall be copper threaded fittings mechanically fastened to the cabinet. Water piping shall be insulated. Construct cabinet with compartments and locate the compressor, reversing valve, and water coil out of the airstream.

Insulate the divider between the compressor and fan sections. The

SECTION 23 81 47 Page 7 control box shall be located within the unit.Unit air inlet/outlet connections shall be as shown on the drawing.

b. Fans: Provide centrifugal type, direct drive fans with permanently lubricated motors. Motors shall be an Electronically Commutated Motor (ECM) microprocessor controlled DC type motor with internal programming factory set for the specific unit and featuring soft start/stop and a delay off feature for maximum efficiency and quiet operation. There will further be provisions for adjusting the air delivery of the motor and blower by plus or minus 15 percent from rated air flow.

c. Refrigerant-to-Air Heat Exchanger: Provide coil constructed of rifled copper tubes with plate aluminum fins designed for refrigerant working pressure of 450 psi. Fins shall be mechanically bonded to tubes. The condensate drain pan shall be epoxy coated and insulated. Provide internal traps on vertical units. Provide drain pan with overflow protection. Drain pan shall be corrosion-resistant material and insualted to prevent sweating. the bottom of the drain pan shall be sloped on two planes which pitches the condensate to the drain connection.

d. Filter Section: Provide replaceable 2 inch thick UL listed fiberglass type filters with standard dust-holding capacityMERV 8. Mount filters in filter frames and provide access panels or doors for removal and replacement of filters.

e. Compressor: Provide hermetically sealed scroll or rotary type compressor, installed on vibration isolators enclosed in an acoustically treated enclosure. Provide high and low pressure switches, low suction temperature cut-out, motor thermal overload protection, 5 minute anti-recycle timer, and start capacitor kit.

Provide capability to reset compressor lockout circuit at the remote thermostat and at the disconnect. Provide units with factory installed sound attenuation package.

f. Reversing Valve: Provide solenoid activated refrigerant reversing valves energized only during the cooling mode and designed to fail in the heating position.

g. Refrigerant-to-Water Heat Exchangers: Provide interlock to shut off circulator pump when the compressor is off. Provide refrigerant-to-water heat exchangers of coaxial type (tube-in-tube), with inner cupronickel water tube and outer steel refrigerant tube.

The refrigerant side of the heat exchanger shall be tested and rated for 450 psig refrigerant working pressure. The water side of the heat exchanger shall be tested and rated for 400 psig working pressure. A parallel capillary tube/thermal expansion valve assembly shall provide superheat over the entire liquid temperature range.

Refrigerant-to-water heat exchangers and refrigerant piping shall be insulated to prevent condensation on the piping containing low temperature water.

h. Factory or field InstalledPump Module: Provide pump module with a single bronze pump and a brass shut-off valve. Cast iron pumps are also acceptable. The pump module kits shall contain the necessary components for the installation, operation and maintenance of the water circuit of a closed-loop distributed pumping application.

i. Sound Attenuation: Provide actory installed option, sound attenuating

SECTION 23 81 47 Page 8 compressor blankets combined with high technology sound attenuating material that is strategically applied within the air handling compartment to further reduce sound transmitted by the unit while in operation. For units with rotary compressors provide sound attenuating material in the compressor compartment in lieu of a compressor blanket. Compressor sound blanket is not recommended on a unit with a rotary compressor.

Hose Kits: Kits shall include two 2 foot long stainless steel braided hoses with swivel connectors on one end, an manual flow control valve with test ports, two shutoff ball valves with memory stops (one with test port), blow down ball valve, and Y-strainer. Hoses shall be fire rated to meet UL 94 . Hoses shall have a maximum working pressure of 300 psi.

k. Bypass for Purging and Flushing: Provide a bypass around the heat pump unit condenser coil. The bypass includes isolation valves and piping that allows for purging and flushing of the system piping.

Provide the necessary flushing pump, hoses, and isolation valves.

l. Hanger Kits: Provide horizontal units with hanger kits consisting of galvanized steel brackets, bolts, washers, and vibration isolators.

The hanger kit shall be designed to support the unit from below and suspend from threaded rods.

m. Controls: Controls and safety devices shall be factory wired and mounted within the control box of the unit cabinet.

(1) Provide a microprocessor based controller that communicates with building BAS. The microprocessor shall control sequencing, high and low pressure switch monitoring, freeze protection, lockout control, night setback, emergency shutdown, short cycle protection, random start, LED mode and fault indicators, fault memory, input and output diagnostics, and a communications port.

Provide a factory-installed low voltage terminal block for field control wiring and a low voltage transformer. Provide communications capability for remote direct digital control (DDC). Use standard BACnet communication protocol

2.2.2 100% Outdoor Air Water-Source water-to-air heat pumps (OAHP)

Provide water-source water-to-air heat pump units that are completely factory assembled, tested, piped, wired and shipped in one section. Units shall include fans, filters, dampers, compressor(s), refrigerant receiver, evaporator dehumidification/cooling coil, heat exchanger (water-to-refrigerant evaporator coil and water-to-refrigerant condenser coil), air-cooled condenser coil, hose kits, controls and energy recovery enthalpy wheel(where indicated). A permanent label shall be affixed to each heat pump unit indicating the basic information for that unit. The information shall include: nominal flow rate gpm, pressure drop feet, temperature drop/rise degree F, and capacity Btu/hr.

a. Cabinet: Provide manufacturer's standard galvanized steel or stainless steel cabinet with no-through metal with 2" thick foam panel construction finished with corrosion resistant epoxy coating powder coated paint, or lacquer acrylic. Provide access panels for inspection and access to internal parts. All access panels shall be serviceable from one side of the unit. Provide door interlocking switch for the fan sections to stop fans upon door opening. Threaded pipe condensate drain connections, supply water connections, and return water

SECTION 23 81 47 Page 9 connections shall be mechanically fastened to the cabinet. Water piping shall be insulated. Construct cabinet with compartments and locate the compressor and water coils out of the airstream. Insulate the divider between the compressor and fan sections. The control box shall be located within the unit. Outdoor units shall include a rain hood and a low leak outdoor air isolation damper.

b. Fans: Provide direct drive radial centrifugal fans with free runing impeller. Motors shall be premium efficiency, ball bearing, open type with internal thermal overload protection. The fan and motor assembly must be capable of overcoming the external static pressures as show on the equipment schedule. Fans shall have a VFD to set ro regulate the fan speed and airflow. The fan housing and motor assembly shall be isolated from the unit cabinetry with a minimum of 95% efficient spring isolators or high efficiency rubber isolators. Fahs shall have flexible connectiotions to reduce vibration transmission.

c. Filter Section: Provide replaceable UL listed pleated filters with minimum MERV 13 rating in accordance with ASHRAE 52.1 .

Mount filters in filter frames and provide access panels or doors for removal and replacement of filters.

d. Refrigeration System: The system's operating refrigerant shall be R-410A. The compressor(s) shall be scroll type. Provide high and low pressure safety switches with internal protection from overloading.

The unit shall be provided with a refrigerant receiver to assist the unit in operating at the highest efficiency over the entire operating range of load conditions.

Unwanted heat shall be rejected back to the condenser water loop for maximum energy efficiency. In cooling mode, the water to refrigerant condenser allows refrigerant energy to be released into the condenser water loop. In heat pump heating mode, the refrigerant extracts heat from the water loop and the water-to-refrigerant condenser operates as a condenser to discharge any overage of compressor energy generated and not needed to control the unit leaving air temperature.

The system shall be designed for simultaneous heat of rejection to both the air-cooled condenser and the water-to-refrigerant condenser while controlling the leaving air temperature within +/- 2 deg F.

i. Refrigerant and Water Circuiting:

The evaporator dehumidification/cooling coil fins shall be die formed, lanced aluminum with extruded fin collars to provide maximum heat transfer, and shall be damage resistant. The evaporator dehumidification/cooling coil tubing shall be fabricated from seamless drawn copper. The inner tubing shall be ½" in diameter, or shall be rifled to produce turbulent refrigeration flow and to enhance the heat transfer process. The tubes shall be hydraulically expanded into the fins to form a permanent metal-to-metal bond for maximum heat transfer and stability. The evaporator dehumidification/cooling coil shall be leak tested with nitrogen.

The heat exchanger shall include two water coils: a water-to-refrigerant evaporator coil (liquid chiller) that is piped in series with a water-to-refrigerant condenser coil. The water-to-refrigerant condenser coil shall be first in series with

SECTION 23 81 47 Page 10 respect to incoming water flow from the water loop. The heat exchanger shall be a brazed plate type. The heat exchanger shall consist of stainless steel plates, copper brazed together to allow a maximum working temperature of 350 deg F. The heat exchanger shall be factory leak-tested with helium at minimum 500 psi for quality assurance, and must have a maximum working pressure of 450 psi. The brazed plate heat exchanger shall be UL listed.

The air-cooled condenser coil (hot gas reheat/heat pump heating coil) fins shall be die-formed, aluminum and shall be damage resistant. The air-cooled condenser coil tubing shall be fabricated from seamless drawn copper. The tubes shall be hydraulically expanded into the fins to form a permanent metal-to-metal bond for maximum heat transfer and stability. The air-cooled condenser coil shall be leak tested with nitrogen. The air-cooled condenser coil shall be positioned with a 5 inch minimum clearance from the evaporator dehumidification/cooling coil to avoid water re-evaporation. Direct connection of the air-cooled condenser coil to the evaporator dehumidification/cooling coil is not allowed.

e. Electrical Control Panel: The electrical control panel shall be easily accessible. The unit shall be provided with single point power connection to serve controls, fans, and compressor(s). The electrical control shall include low voltage transformers to supply 24VAC control power.

f. Drain Pan: Drain pans shall be stainless steel and sloped. The drain pan shall meet requirements of ASHRAE Standard 62. Provide dondensate overflow switch for drain pans.

g. Enthalpy Wheel:

1. The enthalpy wheel shall recover both sensible and latent heat and be AHRI 1060 certified.

2. The matrix shall be a minimum of 8 inches thick to achieve optimal performance and be constructed from a corrugated aluminum alloy. The corrugation shall be uniform to obtain minimum pressure drops through the wheel. Wheels with varying flute sizes are not acceptable. Wheels with non-metallic matrices will not be considered for this application.

3. Wheels with varying flute sizes are not acceptable. Wheels with non-metallic matrices will not be considered for this application.

4. The media shall be specifically treated and coated with Silica Gel desiccant to assist and enhance latent heat transfer. Any other types of desiccants, including 3A or 4A Molecular Sieves will not be considered for HVAC applications.

5. A heavy duty wheel hub will contain the bearings in a closed compartment for wheel sizes up to 96 inches diameter. These shall be maintenance free while larger sizes require periodic lubrication. In addition, segmented wheel shall be provided on diameter sizes above 96 inches.

6. The seal shall made from a dual band ultra-high molecular weight polyethylene and be self-lubricating, wear resistant, and air tight

SECTION 23 81 47 Page 11 against prolonged use. Seals shall be full contact compression type, on both sides of the wheel to ensure minimal leakage. Specially designed stainless steel clips are used to position the seal across the face of the wheel. Any seal that is non-contact is not to be considered a seal and will not acceptable. Labyrinth type seals do not operate properly under different air stream pressures therefore shall not be acceptable in any circumstances.

7. Drive system shall be operated by a fractional horsepower motor (maximum 1 HP), reducing gear-box, pulley and V-belt. Belts shall be made of multi-link high-tech urethane/polyester composite. An access panel shall be provided for maintenance on the drive system. A double purge sector (2 x 5º) shall be factory installed to reduce cross contamination to under 0.04%. Frost control prevention shall be provided by the unit manufacturer and accounted for if outdoor air temperatures are below 10°F at equal airflows and return relative humidity below 30%. Frost control shall be accomplished by a variable speed drive and controlling the leaving air condition of the exhaust air. Other methods of frost control will not be considered for this application. Wheel speed shall not rotate faster than 20 RPM. Any rotational speed above 20 RPM will be unacceptable since this will reduce the efficiency of the purge section.

8. Media cleaning shall be accomplished with any of the following methods: compressed air, low pressure steam, hot water or light detergent without degrading the latent recovery

h. Controls: Controls and safety devices shall be factory wired and mounted within the control box of the unit cabinet.

A digital control system shall be used to accurately and precisely control the 100% outdoor air heat pump system, including dehumidification and leaving air temperature requirements. The controller shall provide precise system control and feature an easy-to-read display which indicates actual operating and set-points. The unit shall include a discharge temperature sensor used to control the discharge set point. Use BACnet Protocol to interface with the BAS system. Provide points as called for in drawing points list.

2.2.3 Plate Heat Exchangers

Plates, frames, and gaskets shall be designed for a working pressure of 150 psi, factory tested at 300 psiand designed for working temperature of 120 deg F Medium temperature water, low temperature water, and pressure relief valve connections shall be located in accordance with the manufacturer's standard practice. Connections larger than 3 inches shall be ASME 300 pound flanged. Plates shall be corrugated Type 304 stainless steel.

2.3 ELECTRICAL WORK

Provide electrical motor driven equipment specified complete with motors, motor starters, and controls as specified herein and in Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM. Provide high efficiency type, single-phase, fractional-horsepower alternating-current motors, including motors that are part of a system, in accordance with NEMA MG 11. In addition to the requirements of Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM, provide polyphase, squirrel-cage medium induction motors, including motors that

SECTION 23 81 47 Page 12

E4TEEZAG

Polygon are part of a system, that meet the efficiency ratings for premium efficiency motors in accordance with NEMA MG 1. Provide motors in accordance with NEMA MG 1 and of sufficient size to drive the load at the specified capacity without exceeding the nameplate rating of the motor.

Motors shall be rated for continuous duty with the enclosure specified.

Motor duty requirements shall allow for maximum frequency start-stop operation and minimum encountered interval between start and stop. Motor torque shall be capable of accelerating the connected load within 20 seconds with 80 percent of the rated voltage maintained at motor terminals during one starting period.

Motor bearings shall be fitted with grease supply fittings and grease relief to outside of the enclosure.

Manual or automatic control and protective or signal devices required for the operation specified and any control wiring required for controls and devices specified, but not shown, shall be provided. For packaged equipment, the manufacturer shall provide controllers including the required monitors and timed restart.

Where two-speed or variable-speed motors are indicated, solid-state variable-speed controller may be provided to accomplish the same function. Use solid-state variable -speed controllers for motors rated

7.45 kW (10 hp) or less and adjustable frequency drives for larger motors.

2.4 ABOVEGROUND PIPING SYSTEMS

Provide above ground piping as specified in Section 23 05 15 Common Piping for HVAC, and Section 23 64 26 CHILLED, CHILLED-HOT, CONDENSER WATER

PIPING SYSTEMS.

2.5 PIPING ACCESSORIES

Provide above ground piping as specified in Section 23 05 15 Common Piping for HVAC, and Section 23 64 26 CHILLED, CHILLED-HOT, CONDENSER WATER

PIPING SYSTEMS.

2.5.1 Building Surface Penetrations

Except as indicated otherwise, provide pipe sleeves as specified in this section. 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.

Sleeves shall not be installed in structural members except where indicated or approved. Except as indicated otherwise piping sleeves shall comply with requirements specified. Sleeves in non-load bearing surfaces shall be galvanized sheet metal, conforming to ASTM A653/A653M , Coating Class G-90, 20 gauge. Sleeves in load bearing surfaces shall be uncoated carbon steel pipe, conforming to ASTM A53/A53M, Schedule 30. Sealants shall be applied to moisture and oil-free surfaces and elastomers to not less than 1/2 inch depth. Sleeves shall not be installed in structural members.

SECTION 23 81 47 Page 13

Each sleeve shall extend through its respective wall, floor, or roof, and shall be cut flush with each surface. Sleeves shall be of such size as to provide a minimum of 1/4 inch all-around clearance between bare pipe and sleeves or between jacketed-insulation and sleeves. Except in pipe chases or interior walls, the annular space between pipe and sleeve or between jacket over-insulation and sleeve shall be sealed in accordance with Section 07 92 00 JOINT SEALANTS.

2.5.1.1 Sleeves in Masonry and Concrete

Provide steel standard weight pipe sleeves. Pipes passing through concrete or masonry wall or concrete floors or roofs shall be provided with pipe sleeves fitted into place at the time of construction. 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.

2.6 ACCESS DOORS FOR VALVES

Provide factory fabricated and primed flush face steel access doors including steel door frame equipped with continuous hinges and turn-screw-operated latch. Provide door frame installation in plaster and masonry walls. Provide access door size as indicated.

2.7 CHEMICAL FEED PROVISIONS

Provide chemical feed provisions as specified in Section 23 64 26 CHILLED, CHILLED-HOT, CONDENSER WATER PIPING SYSTEMS.

2.8 PAINTING OF NEW EQUIPMENT

New equipment painting shall be factory applied or shop applied, and shall be as specified herein. New equipment surfaces constructed of non-ferrous surfaces and materials do not have to be factory or shop painted.

2.8.1 Factory Painting Systems

Manufacturer's standard factory painting systems may be provided subject to certification that the factory painting system applied will withstand 125 hours in a salt-spray fog test, except that equipment located outdoors shall withstand 500 hours in a salt-spray fog test. Salt-spray fog test shall be in accordance with ASTM B117, and for that test the acceptance criteria shall be as follows: immediately after completion of the test, the paint shall show no signs of blistering, wrinkling, or cracking, and no loss of adhesion; and the specimen shall show no signs of rust creepage beyond 0.125 inch on either side of the scratch mark.

The film thickness of the factory painting system applied on the equipment shall not be less than the film thickness used on the test specimen. If manufacturer's standard factory painting system is being proposed for use on surfaces subject to temperatures above 120 degrees F, the factory painting system shall be designed for the temperature service.

2.8.2 Shop Painting Systems for Metal Surfaces

Clean, pretreat, prime and paint metal surfaces; except stainless steel, aluminum, or bronze alloy surfaces need not be painted. Apply coatings to clean dry surfaces. Clean the surfaces to remove dust, dirt, rust, oil and grease by wire brushing and solvent degreasing prior to application of paint, except metal surfaces subject to temperatures in excess of 120

SECTION 23 81 47 Page 14 degrees F shall be cleaned to bare metal.

Where more than one coat of paint is specified, apply the second coat after the preceding coat is thoroughly dry. Lightly sand damaged painting and retouch before applying the succeeding coat. Color of finish coat shall be aluminum or light gray.

a. Temperatures Less Than 120 Degrees F: Immediately after cleaning, the metal surfaces subject to temperatures less than 120 degrees F shall receive one coat of pretreatment primer applied to a minimum dry film thickness of 0.3 mil, one coat of primer applied to a minimum dry film thickness of one mil; and two coats of enamel applied to a minimum dry film thickness of one mil per coat.

b. Temperatures Between 120 and 400 Degrees F: Metal surfaces subject to temperatures between 120 and 400 degrees F shall receive two coats of 400 degrees F heat-resisting enamel applied to a total minimum thickness of 2 mils.

c. Temperatures Greater Than 400 Degrees F: Metal surfaces subject to temperatures greater than 400 degrees F shall receive two coats of 600 degrees F heat-resisting paint applied to a total minimum dry film thickness of 2 mils.

2.9 CONTROLS

Controls for the water-loopheat pump systems complete and ready for operation. shall be integrated with the HVAC system controls package specified in Section , 23 09 00 INSTRUMENTATION AND CONTROL FOR HVAC.

Systems include heat pumps, system equipment, piping, pumps, electrical equipment, controls, and condenser Controls shall be designed in accordance with the manufacturer's recommendations and to comply with the sequence of controls shown on the drawings.

PART 3 EXECUTION

3.1 CONSTRUCTION-RELATED SUSTAINABILITY CRITERIA

Perform and document the following:

3.1.1 Indoor Air Quality During Construction

Provide documentation showing that after construction ends, and prior to occupancy, new filters were installed in conformance with Section 01 33 29 SUSTAINABILITY REPORTING paragraph INDOOR AIR QUALITY DURING CONSTRUCTION.

3.2 INSTALLATION

3.2.1 Heat Pump System

Maintenance access to each piece of equipment shall not be compromised by any type of piping, electrical conduit, or any other utility. Further, install equipment in accordance with NFPA 70 and with the manufacturer's written installation instructions, including the following:

Water-source water-to-air heat pumps - installation instructions

Water-source water-to-water heat pumps - installation instructions

SECTION 23 81 47 Page 15

100% Outdoor Air Water-Source water-to-air heat pumps (OAHP) -installation instructions

Plate Heat Exchangers - installation instructions As-Built Drawings of the installed systems. As-built drawings shall also show and document the as-constructed locations of the well field with dimensions, including all wells and loop fields.

3.3 ABOVEGROUND PIPING

Provide above ground piping as specified in Section 23 64 26 CHILLED, CHILLED-HOT, CONDENSER WATER PIPING SYSTEMS.

a. 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.

b. Flushing and Purging of Piping: Before connection of the header to the polyethylene ground heat exchanger loops, flush and purge the entire aboveground piping system thoroughly in accordance with IGSHPA 21020 recommendations and leave filled with clean water. If the header is not immediately joined to the ground heat exchanger loop, the open ends shall be taped or capped. Purge and vent the above ground system piping of all air.

3.4 FIELD PAINTING AND FINISHING

Requirements for field painting and finishing are specified in Section

09 90 00 PAINTS AND COATINGS.

3.5 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. Adjust and balance air duct systems 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.

3.6 INSTRUCTING OPERATING PERSONNEL

Upon completion of work and at time designated by Contracting Officer, provide services of water source heat pump manufacturer's technical representative for period of not less than one 8-hour working day for instruction of Government operating personnel in proper operation and maintenance of equipment.

3.7 FIELD QUALITY CONTROL

Upon completion and before final acceptance of work, test each system in service to demonstrate compliance with the contract requirements. Adjust controls and balance systems prior to final acceptance of completed systems. Test controls through every cycle of operation. Test safety controls to demonstrate performance of required function. Correct defects in work provided by Contractor and repeat tests. Furnish fuel, water, electricity, instruments, connecting devices, and personnel for tests.

SECTION 23 81 47 Page 16

Flush and clean piping before placing in operation. Clean equipment, piping, strainers, ducts, and filters.

3.7.1 Piping Systems Except for Ground Heat Exchanger and Refrigerant

For above ground piping systems, and steel or copper piping systems:

Before insulating, hydrostatically test each new piping system at not less than 188 psi based on 1.5 times a system pressure of 125 psig. Maintain pressure for 2 hours with no leakage or reduction in gage pressure.

Obtain approval before applying insulation.

3.7.2 Refrigerant Piping Pressure Test and Evacuation

Perform the following when field piping connections are provided.

a. Pressure Test: Test refrigerant piping using dry, oil-free nitrogen, and prove tight at 300 psi on the high side and 150 psi on the low side. Maintain pressure for 2 hours with no leakage or reduction in gage pressure.

b. Evacuation: Use a high vacuum pump and certified micron gage to reduce the absolute pressure on both sides of system simultaneously to 300 microns. After reaching this point charge system with proper refrigerant until pressure of 0 psi is obtained. Repeat evacuation-charging procedure for two more cycles, totaling to three evacuation-charging cycles. On final evacuation, secure pump and maintain 300 microns for 2 hours before charging with required final refrigerant.

3.7.3 Equipment Tests

3.7.3.1 Field Testing

Test each item of equipment in operation, for continuous period of not more than 24 hours under every condition of operation in accordance with each equipment manufacturer's recommendation. Verify that each item of equipment operating parameters are within limits recommended by the manufacturer.

3.7.3.2 Field Test Plans

Furnish water-source heat pump field test plans developed by each equipment manufacturer detailing recommended field test procedures for each item of equipment. Field test plans developed by the installing Contractor, or the equipment sales agency furnishing the equipment will not be acceptable. The Contracting Officer will review and approve the field test plan for each item of equipment listed below prior to commencement of field testing of the equipment.

a. Equipment Items to Test:

Water-source water-to-air heat pumps - field acceptance test plan

Water-source water-to-water heat pumps - field acceptance test plan

100% Outdoor Air Water-Source water-to-air heat pumps (OAHP) - field acceptance test plan

Plate Heat Exchangers - field acceptance test plan

SECTION 23 81 47 Page 17

b. Coordinated Testing: Indicate in each field test plan when work required by this section requires coordination with test work required by other specification sections. Furnish test procedures for the simultaneous or integrated testing of equipment controls which interlock and interface with controls factory prewired or external controls for the equipment provided under Section 23 09 00

INSTRUMENTATION AND CONTROL FOR HVAC

c. Prerequisite Testing: Equipment for which performance testing is dependent upon the completion of the work covered by 23 05 93 TESTING, ADJUSTING, AND BALANCING FOR HVAC shall have that work completed as a prerequisite to testing work under this section. Indicate in each field test plan when such prerequisite work is required.

d. Test Procedure: Indicate in each field test plan each equipment manufacturer's published installation, start-up, and field acceptance test procedures. Include in each test plan a detailed step-by-step procedure for testing automatic controls provided by the manufacturer. Each test plan shall include the required test reporting forms to be completed by the Contractor's testing representatives. Structure procedures to test the controls through all modes of control to confirm that the controls are performing with the intended sequence of control. Controllers shall be verified to be properly calibrated and have the proper set point to provide stable control of their respective equipment.

e. Performance Variables: Each test plan shall list performance variables that are required to be measured or tested as part of the field test. Include in the listed variables performance requirements indicated on the equipment schedules on the design drawings. Furnish with each test procedure a description of acceptable results that have been verified. Identify the acceptable limits or tolerances within which each tested performance variable shall acceptably operate.

f. Job Specific: Each test plan shall be job specific and shall address the particular item of equipment and particular conditions which exist with this contract. Generic or general preprinted test procedures are not acceptable.

g. Specialized Components: Each test plan shall include procedures for field testing and field adjusting specialized components, such as hot gas bypass control valves, or pressure valves.

3.7.3.3 Field Test Reports

a. Equipment Items to Test:

Water-source water-to-air heat pumps - field acceptance test report

Water-source water-to-water heat pumps - field acceptance test report

100% Outdoor Air Water-Source water-to-air heat pumps (OAHP) - field acceptance test report

Plate Heat Exchangers - field acceptance test report

b. Manufacturer's Recommended Test: Conduct the manufacturer's recommended field testing in compliance with the approved test plan

SECTION 23 81 47 Page 18 specified above. Furnish a factory trained field representative authorized by and to represent the equipment manufacturer at the complete execution of the field testing.

c. Operational Test: Conduct a standard continuous 24 hour operational test for each item of equipment. Equipment shutdown before the test period is completed shall result in the test period being started again and run for the required duration. For the duration of the test period, compile an operational log of each item of equipment. Log required entries every 2 hours. Use the test report forms for logging the operational variables.

d. Notice of Tests: Conduct the manufacturer's recommended tests and the operational tests; record the required data using the approved reporting forms. Notify the Contracting Officer in writing at least 15 calendar days prior to the testing. Within 30 calendar days after acceptable completion of testing, submit each test report for review and approval.

e. Report Forms: Type data entries and writing on the test report forms. Completed test report forms for each item of equipment shall be reviewed, approved, and signed by the Contractor's test director and the QC Manager. The manufacturer's field test representative shall review, approve, and sign the report of the manufacturer's recommended test. Signatures shall be accompanied by the person's name typed.

f. Deficiency Resolution: The test requirements acceptably met;

deficiencies identified during the tests shall be corrected in compliance with the manufacturer's recommendations and corrections retested to verify compliance.

3.7.4 Additional Field Testing

Requirements for testing, adjusting, and balancing (TAB) of ducts, piping, and equipment are specified in Section 23 05 93 TESTING, ADJUSTING, AND BALANCING FOR HVAC. Testing, adjusting, and balancing shall begin only when the entire HVAC system, including controls, has been completed with the exception of performance tests. -- End of Section --

SECTION 23 81 47 Page 19

1.5.6 System Diagrams

1.9 COORDINATION OF WORK AND SYSTEM PERFORMANCE