Attachment 09 -236323 AirCooledClosedCircuitFluidCooler.pdf

Ann Arbor VA Healthcare System February 28, 2024 EHRM Infrastructure Upgrade Bid Documents Ann Arbor, MI, 48105 Project No: 506-21-705 Addendum 01 09/16/2024

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SECTION 23 63 23

AIR-COOLED, CLOSED-CIRCUIT FLUID COOLER

PART 1 - GENERAL

1.1 DESCRIPTION

A. Air-cooled closed-circuit fluid cooler with coils, fans, controls complete with accessories.

1.2 RELATED WORK

A. Section 00 72 00, GENERAL CONDITIONS.

B. Section 01 00 00, GENERAL REQUIREMENTS.

C. Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, and SAMPLES.

D. Section 01 91 00, GENERAL COMMISSIONING REQUIREMENTS.

E. Section 23 05 11, COMMON WORK RESULTS FOR HVAC and STEAM GENERATION.

F. Section 23 05 12, GENERAL MOTOR REQUIREMENTS FOR HVAC and STEAM

GENERATION EQUIPMENT.

G. Section 23 05 41, NOISE and VIBRATION CONTROL FOR HVAC PIPING and

EQUIPMENT.

H. Section 23 08 00, COMMISSIONING OF HVAC SYSTEMS.

I. Section 23 21 13, HYDRONIC PIPING.

J. Section 23 21 23, HYDRONIC PUMPS.

K. Section 26 29 11, LOW-VOLTAGE MOTOR STARTERS.

1.3 DEFINITION

A. Engineering Control Center (ECC): The centralized control point for the intelligent control network. The ECC comprises of personal computer and connected devices to form a single workstation.

B. BACNET: Building Automation Control Network Protocol, ASHRAE Standard

135.

C. Ethernet: A trademark for a system for exchanging messages between computers on a local area network using coaxial, fiber optic, or twisted-pair cables.

D. FTT-10: Echelon Transmitter-Free Topology Transceiver.

1.4 QUALITY ASSURANCE

A. Refer to Paragraph, QUALITY ASSURANCE, in Section 23 05 11, COMMON WORK

RESULTS FOR HVAC and STEAM GENERATION, and comply with the following.

B. Refer to PART 3 herein after and Section 01 00 00, GENERAL REQUIREMENTS for test performance.

C. Comply with AHRI requirements for testing and certification of the fluid cooler.

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D. Refer to paragraph, WARRANTY, Section 00 72 00, GENERAL CONDITIONS, except as noted below:

E. Refer to OSHA 29 CFR 1910.95(a) and (b) for Occupational Noise Exposure

Standard

1.5 APPLICABLE PUBLICATIONS

A. The publications listed below form a part of this specification to the extent referenced. The publications are referenced in the text by the basic designation only.

B. Air Conditioning, Heating and Refrigeration Institute (AHRI):

370-2015................Sound Rating of Large Outdoor Refrigerating and

Air-Conditioning Equipment

575-2017................Methods for Measuring Machinery Sound within

Equipment Space

C. American Society of Heating, Refrigerating, and Air-Conditioning

Engineers (ASHRAE):

15-2019.................Safety Standard for Mechanical Refrigeration

Systems

D. American Society of Mechanical Engineers (ASME):

CFVC VIII-1 2019 .......ASME Boiler and Pressure Vessel Code, Section

VIII, "Pressure Vessels - Division 1"

E. American Society of Testing Materials (ASTM):

C 534/C534M-2017........Preformed, Flexible Elastomeric Cellular

Thermal Insulation in Sheet and Tubular Form

C 612-2014..............Mineral-fiber Block and Board Thermal

Insulation

F. National Electrical Manufacturing Association (NEMA):

250-2014................Enclosures for Electrical Equipment (1000 Volts

Maximum)

G. National Fire Protection Association (NFPA):

70-2017.................National Electrical Code

H. Underwriters Laboratories, Inc. (UL):

1995-2015............... Heating and Cooling Equipment

1.6 SUBMITTALS

A. Submit in accordance with Specification Section 01 33 23, SHOP

DRAWINGS, PRODUCT DATA, and SAMPLES.

B. Manufacturer's Literature and Data.

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1. Fluid Cooler including motor starters, overcurrent protection, control panels, and vibration isolators. Submittal data shall include the following and be clearly marked:

a. Rated capacity.

b. Pressure drop.

c. Fan performance

d. Accessories.

e. Installation instructions.

f. Start up procedures.

g. Wiring diagrams, including factor-installed and field-installed wiring.

h. Sound/Noise data report. Manufacturer shall provide sound ratings. Noise warning labels shall be posted on equipment.

C. Maintenance and operating manuals for each piece of equipment in accordance with Section 01 00 00, GENERAL REQUIREMENTS.

D. Run test report for all fluid coolers.

E. Product Certificate: Signed by fluid cooler manufacturer certifying that fluid coolers furnished comply with AHRI requirements. The test report shall include calibrated curves, calibration records, and data sheets for the instrumentation used in factory tests.

PART 2 - PRODUCTS

2.1 AIR-COOLED, CLOSED-CIRCUIT FLUID COOLER

A. General: The fluid cooler shall consist of coil(s), housing, propeller fan(s) direct driven by individual fan motor(s), electrical controls and mounting legs. The fluid cooler shall provide water (or glycol) temperature control by adjusting the fans to adjust heat rejection capacity.

B. Coils: Manufactured coil shall be constructed of copper tubes in a staggered tube pattern. Tubes shall be expanded into continuous, corrugated aluminum fins. The fins shall have full-depth fin collars completely covering the copper tubes, which are connected to heavy wall

Type “L” headers. Inlet coil connector tubes pass through relieved holes in the tube sheet for maximum resistance to piping strain and vibration. Coil shall be split flow into multiple coil circuits, combined to yield a fluid cooler with internal circuits. The supply and return lines shall be spun shut or brazed with a cap and shall include

23 63 23 - 4 a factory-installed Schrader valve. Coils shall be factory leak-tested at a minimum of 300 psig (2068kPag), dehydrated, then filled and sealed with an inert gas holding charge for shipment. Field relief of the

Schrader valve shall indicate a leak-free coil.

C. Housing: The fluid cooler housing shall be constructed of bright aluminum sheet and divided into individual fan sections by full-width baffles. Structural support members, including coil support frame, motor and drive support, shall be galvanized steel for strength and corrosion resistance. Aluminum legs shall be provided to mount unit for vertical air discharge and shall have rigging holes for hoisting the unit into position. An electrical panel shall be inside an integral

NEMA 3R weatherproof section of the housing. The electrical panel shall provide at least 5,000A SCCR.

D. Propeller fans: The propeller fan shall have aluminum blades secured to a corrosion protected steel hub. Fans shall be se-cured to the fan motor shaft by means of a keyed hub and dual setscrews. Fan diameter shall be 26" (660mm) or less. Fans shall be factory-balanced and run before shipment. Fan guards shall be heavy gauge, close-mesh steel wire with corrosion-resistant polyester paint finish that shall be rated to pass a 1000-hour salt spray test.

E. Motors: The fan motor shall be continuous air-over design and shall be equipped with a rain shield and permanently sealed bearing. Motors shall be rigidly mounted on die-formed galvanized steel supports. The fixed-speed fan motor(s) shall have a TEAO enclosure with individual overload protection and disconnect for each motor.

F. Electrical Controls: Electrical controls, overload protection devices and service connection terminals shall be provided, and factory wired inside the integral electrical panel section of the housing. A unit locking disconnect switch shall be factory mounted and wired to the electrical panel and controlled via an externally mounted locking door handle. Provide an interlock circuit to enable fluid cooler operation from and external signal. Provide factory wiring such that only supply wiring, interlock wiring shall be required at fluid cooler installation.

G. Fan Controls: Provide controls to sense the leaving glycol temperature and cycle the multiple fixed-speed fans to maintain leaving water temperatures. Provide aquastats with field adjustable setpoints.

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PART 3 – EXECUTION

3.1 EXAMINATION

A. Examine roughing-in for equipment bases, anchor-bolt sizes and locations, piping and electrical to verify actual locations and sizes before fluid cooler installation and other conditions that might affect fluid cooler performance, maintenance, and operation. Equipment locations shown on drawings are approximate. Determine exact locations before proceeding with installation.

3.2 EQUIPMENT INSTALLATION

A. Install fluid cooler on roof equipment rails with isolation pads or vibration isolators.

1. Vibration isolator types and installation requirements are specified in Section 23 05 41, NOISE and VIBRATION CONTROL FOR HVAC PIPING and

EQUIPMENT

3. Secure fluid cooler to equipment rails according to manufacturer’s written instructions .

4. Install accessories and any other equipment furnished loose by the manufacturer, including aquastats, according to the manufacturer written instructions and electrical requirements.

5. Fluid Coolers shall be installed in a manner as to provide easy access for tube pull and removal of coils and motors .

B. Install hydronic piping as specified in Section 23 23 00, HYDRONIC

PIPING .

D. Install thermometers and gages as recommended by the manufacturer and/or as shown on drawings.

E. Piping Connections:

1. Make piping connections to the fluid cooler for chilled water, and other connections as necessary for proper operation and maintenance of the equipment.

2. Make equipment connections with unions, flanges and couplings for easy removal and replacement of equipment.

3.3 STARTUP AND TESTING

A. Engage manufacturer's factory-trained representative to perform startup and testing service.

B. Inspect, equipment installation, including field-assembled components, and piping and electrical connections.

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C. After complete installation startup checks, according to the manufacturers written instructions, do the following to demonstrate to the COR that the equipment operate and perform as intended.

1. Check bearing lubrication and oil levels.

3. Verify proper motor rotation.

4. Verify thermometers and gages are installed.

5. Test and adjust all controls and safeties. Replace or correct all malfunctioning controls, safeties and equipment as soon as possible to avoid any delay in the use of the equipment.

6. Prepare a written report outlining the results of tests and inspections, and submit it to the COR.

D. The Commissioning Agent will observe startup and contractor testing of selected equipment. Coordinate the startup and contractor testing schedules with the COR and Commissioning Agent. Provide a minimum of 7 days prior notice.

E. Provide services of manufacturer’s technical representative for four hours to instruct VA personnel in operation and maintenance of computer room air conditioning equipment.

3.4 COMMISSIONING

A. Provide commissioning documentation in accordance with the requirements of Section 01 91 00 GENERAL COMMISSIONING REQUIREMENTS and Section 23

08 00 – COMMISSIONING OF HVAC SYSTEMS for all inspection, start up, and contractor testing required above and required by the System Readiness

Checklist provided by the Commissioning Agent.

B. Components provided under this section of the specification will be tested as part of a larger system. Refer to Section 23 08 00 –

COMMISSIONING OF HVAC SYSTEMS and related sections for contractor responsibilities for system commissioning.

3.5 DEMONSTRATION AND TRAINING

A. Provide services of manufacturer’s technical representative for four hours to instruct VA personnel in operation and maintenance of units.

Coordinate this training with that of the cooling tower, if furnished together.

B. Submit training plans and instructor qualifications in accordance with the requirements of Section 23 08 00 – COMMISSIONING OF HVAC SYSTEMS.

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