C04 Attachment 2 - Statement of Work.pdf

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Section C - Description/Specifications/Statement of Work

GENERAL SPECIFICATIONS

Duchesne Bunkhouse Air Conditioner Replacement

1.1 SCOPE OF CONTRACT

A. BASE BID – The work under this contract includes furnishing all labor, materials, equipment, tools, transportation, and incidentals necessary to remove the existing 5-ton air-cooled refrigerant condenser unit and associated indoor coil, and to provide and install a new 2.5-ton air-cooled condenser unit and compatible indoor coil at the Duchesne Bunkhouse. Work shall include, but is not limited to:

• Disconnecting, recovering, and properly disposing of all refrigerant in accordance with federal and state environmental regulations.

• Disconnecting and removing the existing condenser, indoor coil, associated piping, electrical connections, mounting hardware, and any other components required for a complete system removal.

• Providing and installing the new 2.5-ton condenser and coil, including all refrigerant piping, line sets, insulation, fittings, mounting pads, vibration isolation, and supports as required.

• Making all necessary electrical modifications, including reconnection to existing circuits, installation of new disconnects or breakers if required, and ensuring code-compliant grounding and bonding.

• Pressure-testing, evacuating, and charging the new system with the appropriate refrigerant type and quantity, following manufacturer specifications.

• Verifying proper airflow, condensate drainage, thermostat compatibility, and control wiring to ensure a fully functional and balanced system.

• Performing system start-up, testing, and commissioning to confirm proper operation and to meet manufacturer performance standards.

• Restoring and/or repairing all surfaces, penetrations, and finishes affected by the work, leaving the site in clean and workmanlike condition.

All work shall be completed in accordance with applicable codes, manufacturer instructions, and agency standards to provide a fully operational and complete HVAC system.

B. Quantities associated with these options are identified in the Schedule of Items.

1.2 PROJECT LOCATION

A. The project is located in the Duchesne Ranger District of the Ashley National Forest, Duchesne County. The address is 250 S 400 W, Duchesne, Utah 84021. The project may be accessed from State Highway 40.

1.3 SITE INFORMATION AND LIMITATIONS

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A. The following site conditions are considered incidental to the contract and the contractor will not be paid directly for any of the following items:

1. Water and electricity is available at the site for construction purposes.

2. Toilet facilities are available at the site.

1.4 WORK CAMPS, STAGING AND STORAGE AREAS

A. Areas for staging operations and storage of materials shall be approved by the CO. The Contractor must request in writing for approval from the CO to stage trailers on site.

B. No overnight camping will be allowed on site.

1.5 INSPECTION OF WORKSITE

A. The contractor acknowledges they have taken the necessary steps to ascertain the nature and location of work, and have investigated and satisfied themselves as to the general and local conditions that can affect the work or its cost. Any failure of the contractor to take the actions described and acknowledged in this paragraph will not relieve the Contractor from the responsibility of estimating properly the difficulty and cost of successfully performing the work, or for proceeding to successfully perform the work without additional expenses to the government.

1.6 START DATE

A. Summer/Fall 2026

1.7 CONTRACT TIME

A. Base Bid: 60 Calendar Days

1.8 SITE VISIT

A. Yes.

1.9 SPECIFICATIONS

A. The following specifications are attached. Some sections in the schedule of items refer to other sections not listed and are subsidiary to, or are included in payment for other pay items in this contract. These items are considered incidental and no additional compensation will be made.

000001 – Section C 013300 – Submittals 232300 – Refrigerant Piping 236313 – Air Cooled Refrigerant Condensers 238216 – Refrigerant Air Coils

END OF SECTION C October 2026

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USDA FOREST SERVICE, R-4

DUCHESNE BUNKHOUSE AIR CONDENSER REPLACEMENT

SECTION 232300 - REFRIGERANT PIPING

PART 2 - GENERAL

2.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

2.2 SUMMARY, Section Includes:

1. Refrigerant pipes and fittings.

2. Refrigerant piping valves and specialties.

3. Refrigerants.

2.3 MEASUREMENT & PAYMENT

A. No separate payment will be made for the work included under this section; rather payment shall be considered to be included in the items of work listed in the Schedule of Items.

2.4 SUBMITTALS

A. Product Data: For each type of valve and refrigerant piping specialty.

1. Include pressure drop, based on manufacturer's test data, for the following:

a. Thermostatic expansion valves.

b. Solenoid valves.

c. Hot-gas bypass valves.

d. Filter dryers.

e. Strainers.

f. Pressure-regulating valves.

B. Shop Drawings:

1. Show layout of refrigerant piping and specialties, including pipe, tube, and fitting sizes; flow capacities; valve arrangements and locations; slopes of horizontal runs;

oil traps; double risers; wall and floor penetrations; and equipment connection details.

2. Show piping size and piping layout, including oil traps, double risers, specialties, and pipe and tube sizes to accommodate, as a minimum, equipment provided, elevation difference between compressor and evaporator, and length of piping to ensure proper operation and compliance with warranties of connected equipment.

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3. Show interface and spatial relationships between piping and equipment.

C. Field quality-control reports.

D. Operation and Maintenance Data: For refrigerant valves and piping specialties to include in maintenance manuals.

2.5 QUALITY ASSURANCE

A. Welding Qualifications: Qualify procedures and personnel according to 2010 ASME Boiler and Pressure Vessel Code: Section IX, "Welding and Brazing Qualifications."

B. Comply with ASHRAE 15, "Safety Code for Refrigeration Systems."

C. Comply with ASME B31.5, "Refrigeration Piping and Heat Transfer Components."

2.6 PRODUCT STORAGE AND HANDLING

A. Store piping with end caps in place to ensure that piping interior and exterior are clean when installed.

PART 3 - PRODUCTS

3.1 PERFORMANCE REQUIREMENTS

A. Line Test Pressure for Refrigerant R-410A:

1. Suction Lines for Air-Conditioning Applications: 300 psig.

2. Suction Lines for Heat-Pump Applications: 535 psig.

3. Hot-Gas and Liquid Lines: 535 psig.

3.2 COPPER TUBE AND FITTINGS

A. Copper Tube: ASTM B 88, Type K or L] or ASTM B 280, Type ACR].

B. Wrought-Copper Fittings: ASME B16.22.

C. Wrought-Copper Unions: ASME B16.22.

D. Brazing Filler Metals: AWS A5.8/A5.8M.

E. Flexible Connectors:

1. Body: Tin-bronze bellows with woven, flexible, tinned-bronze-wire-reinforced protective jacket.

2. End Connections: Socket ends.

3. Offset Performance: Capable of minimum 3/4-inch misalignment in minimum 7-inch- long assembly.

4. Working Pressure Rating: Factory test at minimum 500 psig.

5. Maximum Operating Temperature: 250 deg F.

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3.3 VALVES AND SPECIALTIES

A. Diaphragm Packless Valves:

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following:

a. Danfoss Inc.

b. Heldon Products; Henry Technologies.

c. Parker Hannifin Corp.

d. Paul Mueller Company.

2. Body and Bonnet: Forged brass or cast bronze; globe design with straight-through or angle pattern.

3. Diaphragm: Phosphor bronze and stainless steel with stainless-steel spring.

4. Operator: Rising stem and hand wheel.

5. Seat: Nylon.

6. End Connections: Socket, union, or flanged.

7. Working Pressure Rating: 500 psig.

8. Maximum Operating Temperature: 275 deg F.

B. Packed-Angle Valves:

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following:

a. Danfoss Inc.

b. Heldon Products; Henry Technologies.

c. Parker Hannifin Corp.

d. Paul Mueller Company.

2. Body and Bonnet: Forged brass or cast bronze.

3. Packing: Molded stem, back seating, and replaceable under pressure.

4. Operator: Rising stem.

5. Seat: Nonrotating, self-aligning polytetrafluoroethylene.

6. Seal Cap: Forged-brass or valox hex cap.

7. End Connections: Socket, union, threaded, or flanged.

8. Working Pressure Rating: 500 psig.

9. Maximum Operating Temperature: 275 deg F.

C. Check Valves:

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following:

a. Danfoss Inc.

b. Emerson Climate Technologies.

c. Heldon Products; Henry Technologies.

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d. Parker Hannifin Corp.

e. Paul Mueller Company.

2. Body: Ductile iron, forged brass, or cast bronze; globe pattern.

3. Bonnet: Bolted ductile iron, forged brass, or cast bronze; or brass hex plug.

4. Piston: Removable polytetrafluoroethylene seat.

5. Closing Spring: Stainless steel.

6. Manual Opening Stem: Seal cap, plated-steel stem, and graphite seal.

7. End Connections: Socket, union, threaded, or flanged.

8. Maximum Opening Pressure: 0.50 psig.

9. Working Pressure Rating: 500 psig.

10. Maximum Operating Temperature: 275 deg F.

D. Service Valves:

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following

a. Danfoss Inc.

b. Emerson Climate Technologies.

c. Heldon Products; Henry Technologies.

d. Parker Hannifin Corp.

e. Paul Mueller Company.

f. Refrigeration Sales, Inc.

2. Body: Forged brass with brass cap including key end to remove core.

3. Core: Removable ball-type check valve with stainless-steel spring.

4. Seat: Polytetrafluoroethylene.

5. End Connections: Copper spring.

6. Working Pressure Rating: 500 psig.

E. Thermostatic Expansion Valves: Comply with AHRI 750.

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following:

a. Danfoss Inc.

b. Emerson Climate Technologies.

c. Heldon Products; Henry Technologies.

d. Paul Mueller Company.

2. Body, Bonnet, and Seal Cap: Forged brass or steel.

3. Diaphragm, Piston, Closing Spring, and Seat Insert: Stainless steel.

4. Packing and Gaskets: Non-asbestos.

5. Capillary and Bulb: Copper tubing filled with refrigerant charge.

6. Suction Temperature: 40 deg F].

7. Superheat: Adjustable] ].

8. Reverse-flow option (for heat-pump applications).

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9. End Connections: Socket, flare, or threaded union.

10. Working Pressure Rating: ] 450 psig].

F. Straight-Type Strainers:

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following:

a. Danfoss Inc.

b. Heldon Products; Henry Technologies.

c. Parker Hannifin Corp.

2. Body: Welded steel with corrosion-resistant coating.

3. Screen: 100-mesh stainless steel.

4. End Connections: Socket or flare.

5. Working Pressure Rating: 500 psig.

6. Maximum Operating Temperature: 275 deg F.

G. Angle-Type Strainers:

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following:

a. Danfoss Inc.

b. Heldon Products; Henry Technologies.

c. Parker Hannifin Corp.

2. Body: Forged brass or cast bronze.

3. Drain Plug: Brass hex plug.

4. Screen: 100-mesh monel.

5. End Connections: Socket or flare.

6. Working Pressure Rating: 500 psig.

7. Maximum Operating Temperature: 275 deg F.

H. Moisture/Liquid Indicators:

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following:

a. Danfoss Inc.

b. Emerson Climate Technologies.

c. Heldon Products; Henry Technologies.

d. Parker Hannifin Corp.

2. Body: Forged brass.

3. Window: Replaceable, clear, fused glass window with indicating element protected by filter screen.

4. Indicator: Color coded to show moisture content in parts per million (ppm).

5. Minimum Moisture Indicator Sensitivity: Indicate moisture above 60 ppm.

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6. End Connections: Socket or flare.

7. Working Pressure Rating: 500 psig.

8. Maximum Operating Temperature: 240 deg F.

I. Permanent Filter Dryers: Comply with AHRI 730.

1. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following:

a. Danfoss Inc.

b. Emerson Climate Technologies.

c. Heldon Products; Henry Technologies.

d. Parker Hannifin Corp.

2. Body and Cover: Painted-steel shell.

3. Filter Media: 10 micron, pleated with integral end rings; stainless-steel support.

4. Desiccant Media: Activated alumina].

5. Designed for reverse flow (for heat-pump applications).

6. End Connections: Socket.

7. Access Ports: NPS 1/4 connections at entering and leaving sides for pressure differential measurement.

8. Maximum Pressure Loss: 2 psig].

9. Working Pressure Rating: 500 psig.

10. Maximum Operating Temperature: 240 deg F.

3.4 REFRIGERANTS

A. ASHRAE 34, R-410A: Pentafluoroethane/Difluoromethane.

1. Manufacturers: Subject to compliance with requirements, provide products by one of the following:

a. Arkema Inc.

b. DuPont Fluorochemicals Div.

c. Genetron Refrigerants; Honeywell International Inc.

d. Mexichem Fluor Inc.

PART 4 - EXECUTION

4.1 PIPING APPLICATIONS FOR REFRIGERANT R-410A

A. Suction Lines NPS 3-1/2 and Smaller for Conventional Air-Conditioning Applications:

Copper, Type ACR, drawn-temper tubing and wrought-copper fittings with brazed joints.

B. Hot-Gas and Liquid Lines, and Suction Lines for Heat-Pump Applications: Copper, Type ACR, annealed- or drawn-temper tubing and wrought-copper fittings with brazed joints.

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C. Safety-Relief-Valve Discharge Piping: Copper, Type ACR, annealed- or drawn-temper tubing and wrought-copper fittings with brazed or soldered joints.

4.2 VALVE AND SPECIALTY APPLICATIONS

A. Install diaphragm packless or packed-angle valves in suction and discharge lines of compressor.

B. Install service valves for gage taps at inlet and outlet of hot-gas bypass valves and strainers if they are not an integral part of valves and strainers.

C. Install a check valve at the compressor discharge and a liquid accumulator at the compressor suction connection.

D. Except as otherwise indicated, install diaphragm packless or packed-angle valves on inlet and outlet side of filter dryers.

E. Install a full-size, three-valve bypass around filter dryers.

F. Install solenoid valves upstream from each expansion valve and hot-gas bypass valve.

Install solenoid valves in horizontal lines with coil at top.

G. Install thermostatic expansion valves as close as possible to distributors on evaporators.

1. Install valve so diaphragm case is warmer than bulb.

2. Secure bulb to clean, straight, horizontal section of suction line using two bulb straps. Do not mount bulb in a trap or at bottom of the line.

3. If external equalizer lines are required, make connection where it will reflect suction-line pressure at bulb location.

H. Install safety relief valves where required by 2010 ASME Boiler and Pressure Vessel Code. Pipe safety-relief-valve discharge line to outside according to ASHRAE 15.

I. Install moisture/liquid indicators in liquid line at the inlet of the thermostatic expansion valve or at the inlet of the evaporator coil capillary tube.

J. Install strainers upstream from and adjacent to the following unless they are furnished as an integral assembly for the device being protected:

1. Solenoid valves.

2. Thermostatic expansion valves.

3. Hot-gas bypass valves.

4. Compressor.

K. Install filter dryers in liquid line between compressor and thermostatic expansion valve, and in the suction line at the compressor.

L. Install flexible connectors at compressors.

4.3 PIPING INSTALLATION

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A. Drawing plans, schematics, and diagrams indicate general location and arrangement of piping systems; indicated locations and arrangements were used to size pipe and calculate friction loss, expansion, pump sizing, and other design considerations. Install piping as indicated unless deviations to layout are approved on Shop Drawings.

B. Install refrigerant piping according to ASHRAE 15.

C. Install piping in concealed locations unless otherwise indicated and except in equipment rooms and service areas.

D. Install piping indicated to be exposed and piping in equipment rooms and service areas at right angles or parallel to building walls. Diagonal runs are prohibited unless specifically indicated otherwise.

E. Install piping above accessible ceilings to allow sufficient space for ceiling panel removal.

F. Install piping adjacent to machines to allow service and maintenance.

G. Install piping free of sags and bends.

H. Install fittings for changes in direction and branch connections.

I. Select system components with pressure rating equal to or greater than system operating pressure.

J. Install piping as short and direct as possible, with a minimum number of joints, elbows, and fittings.

K. Arrange piping to allow inspection and service of refrigeration equipment. Install valves and specialties in accessible locations to allow for service and inspection. Install access doors or panels as specified in Division 08 Sections if valves or equipment requiring maintenance is concealed behind finished surfaces.

L. Install refrigerant piping in protective conduit where installed belowground.

M. Install refrigerant piping in rigid or flexible conduit in locations where exposed to mechanical injury.

N. Slope refrigerant piping as follows:

1. Install horizontal hot-gas discharge piping with a uniform slope downward away from compressor.

2. Install horizontal suction lines with a uniform slope downward to compressor.

3. Install traps and double risers to entrain oil in vertical runs.

4. Liquid lines may be installed level.

O. When brazing or soldering, remove solenoid-valve coils and sight glasses; also remove valve stems, seats, and packing, and accessible internal parts of refrigerant specialties.

Do not apply heat near expansion-valve bulb.

P. Install piping with adequate clearance between pipe and adjacent walls and hangers or between pipes for insulation installation.

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Q. Identify refrigerant piping and valves according to Section 230553 "Identification for HVAC Piping and Equipment."

R. Install sleeves for piping penetrations of walls, ceilings, and floors. Comply with requirements for sleeves specified in Section 230517 "Sleeves and Sleeve Seals for HVAC Piping."

S. Install sleeve seals for piping penetrations of concrete walls and slabs. Comply with requirements for sleeve seals specified in Section 230517 "Sleeves and Sleeve Seals for HVAC Piping."

T. Install escutcheons for piping penetrations of walls, ceilings, and floors. Comply with requirements for escutcheons specified in Section 230518 "Escutcheons for HVAC Piping."

4.4 PIPE JOINT CONSTRUCTION

A. Ream ends of pipes and tubes and remove burrs. Bevel plain ends of steel pipe.

B. Remove scale, slag, dirt, and debris from inside and outside of pipe and fittings before assembly.

C. Fill pipe and fittings with an inert gas (nitrogen or carbon dioxide), during brazing or welding, to prevent scale formation.

D. Soldered Joints: Construct joints according to ASTM B 828 or CDA's "Copper Tube Handbook."

E. Brazed Joints: Construct joints according to AWS's "Brazing Handbook," Chapter "Pipe and Tube."

1. Use Type BCuP (copper-phosphorus) alloy for joining copper socket fittings with copper pipe.

2. Use Type BAg (cadmium-free silver) alloy for joining copper with bronze or steel.

4.5 HANGERS AND SUPPORTS

A. Comply with requirements for pipe hangers and supports specified in Section 230529 "Hangers and Supports for HVAC Piping and Equipment."

B. Install the following pipe attachments:

1. Adjustable steel clevis hangers for individual horizontal runs less than 20 feet long.

2. Roller hangers and spring hangers for individual horizontal runs 20 feet or longer.

3. Pipe Roller: MSS SP-58, Type 44 for multiple horizontal piping 20 feet or longer, supported on a trapeze.

4. Spring hangers to support vertical runs.

5. Copper-clad hangers and supports for hangers and supports in direct contact with copper pipe.

C. Install hangers for copper tubing with the following maximum spacing and minimum rod diameters:

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1. NPS 1/2: Maximum span, 60 inches; minimum rod, 1/4 inch.

2. NPS 5/8: Maximum span, 60 inches; minimum rod, 1/4 inch.

3. NPS 1: Maximum span, 72 inches; minimum rod, 1/4 inch.

4. NPS 1-1/4: Maximum span, 96 inches; minimum rod, 3/8 inch.

5. NPS 1-1/2: Maximum span, 96 inches; minimum rod, 3/8 inch.

6. NPS 2: Maximum span, 96 inches; minimum rod, 3/8 inch.

7. NPS 2-1/2: Maximum span, 108 inches; minimum rod, 3/8 inch.

8. NPS 3: Maximum span, 10 feet; minimum rod, 3/8 inch.

9. NPS 4: Maximum span, 12 feet; minimum rod, 1/2 inch.

D. Support multifloor vertical runs at least at each floor.

4.6 FIELD QUALITY CONTROL

A. Perform the following tests and inspections:

1. Comply with ASME B31.5, Chapter VI.

2. Test refrigerant piping, specialties, and receivers. Isolate compressor, condenser, evaporator, and safety devices from test pressure if they are not rated above the test pressure.

3. Test high- and low-pressure side piping of each system separately at not less than the pressures indicated in "Performance Requirements" Article.

a. Fill system with nitrogen to the required test pressure.

b. System shall maintain test pressure at the manifold gage throughout duration of test.

c. Test joints and fittings with electronic leak detector or by brushing a small amount of soap and glycerin solution over joints.

d. Remake leaking joints using new materials, and retest until satisfactory results are achieved.

B. Prepare test and inspection reports.

4.7 SYSTEM CHARGING

A. Charge system using the following procedures:

1. Install core in filter dryers after leak test but before evacuation.

2. Evacuate entire refrigerant system with a vacuum pump to 500 micrometers. If vacuum holds for 12 hours, system is ready for charging.

3. Break vacuum with refrigerant gas, allowing pressure to build up to 2 psig.

4. Charge system with a new filter-dryer core in charging line.

4.8 ADJUSTING

A. Adjust thermostatic expansion valve to obtain proper evaporator superheat.

B. Adjust high- and low-pressure switch settings to avoid short cycling in response to fluctuating suction pressure.

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C. Adjust set-point temperature of air-conditioning or chilled-water controllers to the system design temperature.

D. Perform the following adjustments before operating the refrigeration system, according to manufacturer's written instructions:

1. Open shutoff valves in condenser water circuit.

2. Verify that compressor oil level is correct.

3. Open compressor suction and discharge valves.

4. Open refrigerant valves except bypass valves that are used for other purposes.

5. Check open compressor-motor alignment and verify lubrication for motors and bearings.

END OF SECTION 232300

October 2026

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DUCHESNE BUNKHOUSE AIR CONDENSER UNIT REPLACEMENT

SECTION 236313 - AIR-COOLED REFRIGERANT CONDENSERS

PART 5 - GENERAL

5.1 SUMMARY

A. Section includes packaged, air-cooled refrigerant condensers for outdoor installation.

5.2 MEASUREMENT & PAYMENT

A. Separate payment will be made for the work included under this section; rather payment shall be considered to be included in the items of work listed in the Schedule of Items.

5.3 SUBMITTALS

A. Product Data: For each type of product indicated.

B. Shop Drawings: For air-cooled refrigerant condensers. Include plans, elevations, sections, details, and attachments to other work.

1. Detail equipment assemblies and indicate dimensions, weights, loads, required clearances, method of field assembly, components, and location and size of each field connection.

2. Wiring Diagrams: For power, signal, and control wiring.

C. Operation and maintenance data.

5.4 QUALITY ASSURANCE

A. Electrical Components, Devices, and Accessories: Listed and labeled as defined in NFPA 70, by a qualified testing agency, and marked for intended location and application.

B. ASHRAE/IESNA 90.1 Compliance: Applicable requirements in ASHRAE/IESNA 90.1, Section 6 - "Heating, Ventilating, and Air-Conditioning."

PART 6 - PRODUCTS

6.1 MANUFACTURERS

A. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following

1. Carrier Corporation; a unit of United Technologies Corp.

2. Daikin Applied.

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3. Lennox.

4. Trane.

6.2 MANUFACTURED UNITS

A. Description: Factory assembled and tested; consisting of casing, condenser coils, condenser fans and motors, and unit controls.

B. Refrigerant: R-410A.

C. Condenser Coil: Factory tested at 425 psig.

1. Tube: Minimum 3/8-inch- diameter seamless copper. 5/8-inch- diameter seamless copper.

2. Coil Fin: Aluminum.

3. Circuit: To match compressors.

D. Condenser Fans and Drives: Propeller fans with aluminum or galvanized-steel fan blades, for vertical air discharge; directly driven with permanently lubricated ball-bearing motors with integral current- and thermal-overload protection.

1. Weather-proof motors with rain shield and shaft slinger.

2. Extend grease lines to outside of casing.

E. Condenser Fans and Drives: Forward-curved centrifugal fans for vertical air discharge.

1. Fan on steel shaft with self-aligning ball bearings.

2. V-belt drive with minimum of two belts; variable pitch drive pulley.

3. Motor mounted on adjustable slide base.

F. Operating and Safety Controls: Include condenser fan motor thermal and overload cutouts; 115-V control transformer, if required; magnetic contactors for condenser fan motors and a nonfused factory-mounted and -wired disconnect switch for single external electrical power connection.

1. Fan Cycling Control: Head pressure switches.

G. Casings: Galvanized or zinc-coated steel treated and finished with manufacturer's standard paint coating, designed for outdoor installation with weather protection for components and controls, and with the following:

1. Removable panels for access to controls, condenser fans, motors, and drives.

2. Plated -steel fan guards.

3. Lifting eyes.

6.3 CAPACITIES AND CHARACTERISTICS: See Drawings.

6.4 MOTORS

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A. Comply with NEMA designation, temperature rating, service factor, enclosure type, and efficiency requirements for motors specified in Section 230513 "Common Motor Requirements for HVAC Equipment."

1. Enclosure Type: Totally enclosed, fan cooled.

2. Motor Sizes: Minimum size as indicated. If not indicated, large enough so driven load will not require motor to operate in service factor range above 1.0.

3. Mount unit-mounted disconnect switches on exterior of unit.

6.5 SOURCE QUALITY CONTROL

A. Testing Requirements: Factory test sound-power-level ratings according to ARI 270.

PART 7 - EXECUTION

7.1 INSTALLATION

A. Install units level and plumb, firmly anchored in locations indicated; maintain manufacturer's recommended clearances.

B. Equipment Mounting:

1. Install air-cooled condenser refrigerant condensers on cast-in-place concrete equipment bases. Comply with requirements for equipment bases and foundations specified in Division 03 Sections.

2. Comply with requirements for vibration isolation and seismic control devices specified in Section 230548 "Vibration and Seismic Controls for HVAC."

C. Maintain manufacturer's recommended clearances for service and maintenance.

D. Loose Components: Install electrical components, devices, and accessories that are not factory mounted.

7.2 CONNECTIONS

A. Install piping adjacent to machine to allow service and maintenance.

B. Refrigerant Piping: Connect piping to unit with pressure relief, service valve, filter-dryer, and moisture indicator on each refrigerant-circuit liquid line. Refrigerant piping and specialties are specified in Section 232300 "Refrigerant Piping."

7.3 FIELD QUALITY CONTROL

A. Perform tests and inspections.

B. Tests and Inspections:

1. Perform electrical test and visual and mechanical inspection.

2. Leak Test: After installation, charge system and test for leaks. Repair leaks and retest until no leaks exist.

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3. Operational Test: After electrical circuitry has been energized, start units to confirm proper motor rotation and unit operation. Complete manufacturer's starting checklist.

4. Test and adjust controls and safeties. Replace damaged and malfunctioning controls and equipment.

5. Verify proper airflow over coils.

C. Verify that vibration isolation and flexible connections properly dampen vibration transmission to structure.

D. Air-cooled refrigerant condensers will be considered defective if they do not pass tests and inspections.

E. Prepare test and inspection reports.

END OF SECTION 236313

MARCH 2020

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DUCHESNE BUNKHOUSE AIR CONDENSER UNIT REPLACEMENT

PART 8 -

SECTION 238216 - REFRIGERANT AIR COILS

PART 9 - GENERAL

9.1 SUMMARY

A. Section includes refrigerant air coils.

9.2 MEASUREMENT & PAYMENT

A. No separate payment will be made for the work included under this section; rather payment shall be considered to be included in the items of work listed in the Schedule of Items.

9.3 ACTION SUBMITTALS

A. Product Data: For each type of product.

9.4 CLOSEOUT SUBMITTALS

A. Operation and maintenance data.

PART 10 - PRODUCTS

10.1 DESCRIPTION

A. ASHRAE Compliance: Comply with applicable requirements in ASHRAE 62.1, Section 5 - "Systems and Equipment" and Section 7 - "Construction and Startup."

10.2 REFRIGERANT AIR COILS

A. Manufacturers: Subject to compliance with requirements, available manufacturers offering products that may be incorporated into the Work include, but are not limited to the following:

1. Carrier Corporation; a unit of United Technologies Corp.

2. Daikin

3. Lennox Industries, Inc.; Lennox International.

4. Trane.

B. Performance Ratings: Tested and rated according to AHRI 410 and ASHRAE 33.

C. Minimum Working-Pressure Rating: 300 psig.

D. Source Quality Control: Factory tested to 450 psig.

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E. Tubes: ASTM B 743 copper, minimum 0.020 inch thick.

F. Fins: Aluminum, minimum 0.006 inch thick.

G. Suction and Distributor Piping: ASTM B 88, Type L copper tube with brazed joints.

H. Frames: Galvanized-steel channel frame, minimum 0.052 inch thick for slip-in or flanged mounting.

I. Capacities and Characteristics: See Drawings.

PART 11 - EXECUTION

11.1 INSTALLATION

A. Install coils level and plumb.

B. Install coils in metal ducts and casings constructed according to SMACNA's "HVAC Duct Construction Standards, Metal and Flexible."

C. Connect condensate drain pan under each cooling coil.

1. Construct drain pans to extend beyond coil length and width and to connect to condensate trap and drainage.

2. Extend drain pan upstream and downstream from coil face.

3. Extend drain pan under coil headers and exposed supply piping.

D. Install moisture eliminators for cooling coils. Extend drain pan under moisture eliminator.

E. Straighten bent fins on air coils.

F. Clean coils using materials and methods recommended in writing by manufacturers, and clean inside of casings and enclosures to remove dust and debris.

G. Piping installation requirements are specified in other Sections. Drawings indicate general arrangement of piping, fittings, and specialties.

H. Install piping adjacent to coils to allow service and maintenance.

I. Connect refrigerant piping according to Section 232300 "Refrigerant Piping."

END OF SECTION 238216.13

MARCH 2020