23 6423_SCROLL WATER CHILLERS.pdf

GORDON STATE COLLEGE REVISED DECEMBER 16, 2025

ALUMNI HALL CHILLER REPLACEMENT CONSTRUCTION DOCUMENTS

NBP#25072

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SECTION 23 6423 - SCROLL WATER CHILLERS

PART 1 GENERAL

1.1 SECTION INCLUDES

A. Factory-assembled packaged chiller.

B. Charge of refrigerant and oil.

C. Controls and control connections.

D. Chilled water connections.

E. Electrical power connections.

F. Start-up and training.

1.2 RELATED REQUIREMENTS

A. Section 03 3000 - CAST-IN-PLACE CONCRETE: Concrete housekeeping pads.

B. Section 23 0510 - General HVAC Requirements - Warranty.

C. Section 23 0913 - INSTRUMENTATION AND CONTROL DEVICES FOR HVAC

D. Section 23 0923 - DIRECT-DIGITAL CONTROL SYSTEM FOR HVAC.

E. Section 23 0994 - HVAC SEQUENCE OF OPERATION.

F. Section 23 2113 - HYDRONIC PIPING.

G. Section 23 2114 - HYDRONIC SPECIALTIES.

H. Section 26 0583 - Wiring Connections.

1.3 REFERENCE STANDARDS

A. AHRI 550/590 (I-P) - Performance Rating of Water-Chilling and Heat Pump Water-Heating

Packages Using the Vapor Compression Cycle; 2015.

B. ASHRAE Std 15 - Safety Standard for Refrigeration Systems; 2013.

C. ASHRAE Std 90.1 I-P - Energy Standard for Buildings Except Low-Rise Residential Buildings;

2013, Including All Amendments and Errata.

D. ASME BPVC-VIII-1 - Boiler and Pressure Vessel Code, Section VIII, Division 1 - Rules for

Construction of Pressure Vessels; 2015.

E. NEMA EN 10250 - Enclosures for Electrical Equipment (1000 Volts Maximum); 2024.

F. UL 1995 - Heating and Cooling Equipment; Current Edition, Including All Revisions.

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1.4 SUBMITTALS

A. Refer to Section 23 0510 - General Mechanical Requirements for submittal procedures.

B. Product Data: Provide rated capacities, weights, specialties and accessories, electrical requirements and wiring diagrams.

C. Shop Drawings: Indicate components, assembly, dimensions, weights and loadings, required clearances, and location and size of field connections. Indicate equipment, piping and connections, valves, strainers, and thermostatic valves required for complete system.

D. Manufacturer's Certificate: Certify that components furnished but not produced by manufacturer meet or exceed manufacturer's requirements.

E. Manufacturer's Performance Data: Indicate energy input versus cooling load output from 0 to

100 percent of full load at specified and minimum condenser water temperature for water-cooled chillers and at specified and minimum outdoor air temperature for air-cooled chillers.

F. Manufacturer's Instructions: Submit manufacturer's complete installation instructions.

G. Sustainable Design Documentation: Submit manufacturer's product data on refrigerant used, showing compliance with specified requirements.

H. Operation and Maintenance Data: Include start-up instructions, maintenance data, parts lists, controls, and accessories; include trouble-shooting guide.

I. Warranty: Submit manufacturer's warranty and ensure forms have been filled out in the

Owner's name and registered with manufacturer.

J. Certificate: Provide Manufacturer's Certificate complying with the requirements of the General

Conditions.

1.5 DELIVERY, STORAGE, AND HANDLING

A. Conform to manufacturer's written installation instructions for rigging, unloading, and transporting units.

B. Deliver units to the job site completely assembled and charged with refrigerant and oil by manufacturer.

1.6 WARRANTY

A. See Section 01 7800 - Closeout Submittals, for additional warranty requirements.

B. Manufacturer's Warranty: Provide minimum five year warranty to include coverage for materials and labor for complete assembly.

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PART 2 PRODUCTS

2.1 MANUFACTURERS

A. Carrier, a part of UTC Building and Industrial Systems, a unit of United Technologies Corp;

______: www.carrier.com.

B. Trane, a brand of Ingersoll Rand; ______: www.trane.com.

C. York International Corporation/Johnson Controls, Inc; ______: www.york.com.

D. Substitutions: See Section 01 6000 - Product Requirements.

1. The chilled water system has been designed based on specific capacities and characteristics of equipment specified in this section and other sections.

2. When substitution of a different manufacturer or model number is desired, submit sufficient information to demonstrate to the Design Professional that the substitute will have the same or better performance as that specified AND that the related equipment in the system will perform acceptably with the substitute.

2.2 CHILLERS

A. Chillers: Factory assemble and test chiller consisting of compressor(s), compressor motor(s), evaporator, condenser, enclosure, refrigeration circuits(s) and specialties, interconnecting piping, across the line starters, and microprocessor-based controls.

1. Rating: AHRI 550/590 (I-P).

2. Safety: UL 1995 and ASHRAE Std 15.

3. Construction & Testing: ASME BPVC-VIII-1 as applicable for construction type.

4. Products Requiring Electrical Connection: Listed and classified by Underwriters

Laboratories Inc. or testing firm acceptable to the Authority Having Jurisdiction as suitable for the purpose specified and indicated.

5. Energy Efficiency:

a. In accordance with the requirements of the Georgia State Energy Code.

6. Enclosures:

a. Frame:

1) Heavy-gage steel.

2) Factory apply hot-dipped galvanized or air-dried paint finish.

b. Steel Chiller Cabinets:

1) Factory apply baked on enamel or baked on powder paint finish.

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c. Electrical Equipment: NEMA EN 10250 or UL 1995 as applicable.

2.3 COMPRESSORS AND EVAPORATOR

A. Compressors: Hermetic scroll type.

1. Unit: Fully hermetic type with multiple, direct drive compressors with discharge and suction service valves.

2. Vibration Control: Factory installed internal isolators or field installed external isolators.

3. Oil Lubrication System: Initial oil charge, oil sump, heater, oil level, and sight glass.

4. Capacity Reduction System: Compressor staging with control down to 12 percent of full load without the activation of hot gas by-bass.

5. Motor: 3600 or 3500 rpm, suction gas-cooled, with thermal or current overload protection.

B. Evaporator: Provide shell and tube or brazed plate type.

1. Shell and tube type.

a. Shell, removable heads and tube support sheets constructed of carbon steel.

b. Tubes: Mechanically expand and fasten, seamless, externally or internally enhanced, copper tubes into intermediate tube support sheets along the length of shell to avoid contact and relative motion between tubes.

c. Refrigerant Working-Side Pressure Rating: 400 psig minimum.

d. Water Working-Side Pressure Rating: 150 psig minimum.

e. Provide with grooved connections.

f. Insulation for all cold surfaces.

1) Insulation is factory installed on shell and suction piping.

2) 0.75 inches minimum thick, closed cell, expanded polyvinyl chloride, polyurethane, or vinyl nitrate polymer insulation with a maximum k value of 0.28.

g. Provide factory installed vents and water drain connections on evaporator or piping.

h. Provide factory installed fittings for temperature control sensors on evaporator or piping.

i. Freeze Protection for Outdoor Locations: Provide thermostatically controlled electric heater to protect from freezing at ambient temperatures down to minus 20 degrees F.

2. Brazed plate type.

a. Plate Material: 316 stainless steel.

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b. Refrigerant Working-Side Pressure Rating: 430 psig minimum.

c. Water Working-Side Pressure Rating: 150 psig minimum.

d. Provide with grooved connections.

e. Provide a wye strainer for installation on the chilled water return at the connection to the chiller, 20 mesh or otherwise per the manufacturer's recommendations.

f. Insulation for all cold surfaces.

1) Insulation is factory installed on evaporator, connections, and suction piping.

2) 0.75 inches minimum thick, closed cell, expanded polyvinyl chloride, polyurethane, or Armaflex II insulation with a maximum k value of 0.28.

g. Provide factory installed vents and water drain connections on evaporator or piping.

h. Provide factory installed fittings for temperature control sensors on evaporator or piping.

i. Freeze Protection for Outdoor Locations: Provide thermostatically controlled electric heater to protect from freezing at ambient temperatures down to minus 20 degrees F.

2.4 AIR-COOLED CONDENSER AND FANS

A. Provide finned-tube, brazed one-piece, or flat tube-plate-manifold type.

1. Finned-tube type.

a. Mechanically bond aluminum fins to copper tubing and protect with corrosion resistant materials or coatings.

b. Clean, dehydrate and test.

c. Leak Test: 650 psig minimum.

2. Brazed one-piece type.

a. Construct of same material to avoid galvanic corrosion.

b. Braze coils and headers as one assembly.

c. Clean, dehydrate and test.

d. Leak Test: 650 psig minimum.

3. Flat tube-plate-manifold type.

a. Construct all components of same aluminum alloy to avoid galvanic corrosion.

b. Braze manifolds, flat tubes and fin-plates together to form single coil assembly.

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c. Clean, dehydrate and test.

d. Leak Test: 656 psig minimum.

B. Coil Guards: Provide corrosion proof, louvered panels, heavy gage wire panels, or grilles, factory installed. Provide coil protection for shipping by enclosing entire condenser coil with heavy plastic to prevent coil damage during shipping or rigging.

C. Fans and Motors:

1. Fans: Dynamically balance propeller type fans of reinforced polymer or glass fiber reinforced composite corrosion resistant construction equipped with sealed, permanently lubricated ball bearings.

2. Discharge Fan Guards: Corrosion resistant, heavy gage, steel wire.

3. Discharge Direction: Vertical.

4. Motors: Direct drive, totally enclosed for outdoor use with current overload protection.

a. Provide variable speed on first fan of each circuit (minimum).

2.5 REFRIGERATION CIRCUITS

A. Provide multiple independent refrigeration circuit(s) with multiple compressor(s) per circuit for units over 50 tons capacity.

B. Provide liquid line shut-off valve, filter-drier, expansion valve, and refrigerant relief device for each independent circuit.

2.6 ENCLOSURES

A. House components in welded steel frame with galvanized steel panels with weather resistant, baked enamel finish.

B. Protect components underneath unit with tamperproof welded wire mesh guards.

C. Protect the condenser coil sections with louvered panel enclosures.

2.7 UNIT MOUNTING

A. Mount chiller assembly on elastomeric pads evenly distributed under the chiller frame load points.

B. Neoprene Pad Isolators:

1. Rubber or neoprene waffle pads.

a. Hardness: 30 durometer.

b. Thickness: Minimum 1/2 inch each pad.

c. Maximum Loading: 50 psi.

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d. Rib Height: Maximum 0.7 times width.

2. Configuration: 1/2 inch thick waffle pads bonded each side of 1/4 inch thick steel plate.

2.8 INTEGRATED MICROPROCESSOR BASED DDC CONTROLS PACKAGE

A. Pre-wire, assemble, factory mount, and test operating and safety control system consisting of a digital display or gages, on-auto-off switch, motor starters, disconnect switches, power and control wiring. Provide controls, monitoring, programmable set-points, alarms, and BAS as defined below:

1. Automatic Adjustable Operating Controls:

a. Temperature of chilled water leaving chiller.

b. Chiller system capacity control based on set-points and system load.

c. Compressor short-cycling prevention.

d. Lead/lag for multiple compressors.

e. Automatic reset on power source failure.

f. Load limiting.

g. Sequencing of condenser fans.

2. Normal Operation Monitoring and Open Cover-less Displays:

a. Hours of operation.

b. Suction and discharge refrigerant pressures.

c. Automatic diagnostics.

d. Number of starts.

e. On/off compressor status.

f. Entering and leaving chilled water temperatures.

g. Status of operation.

h. Weekly purge cycle totalization if applicable.

i. Oil pressure.

3. Set-Points:

a. Leaving chilled water temperature.

b. Date/time.

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4. Automatic Chiller Shut-Down Safety Controls and Alarm:

a. Automatic Reset:

1) Chilled water flow interlock.

2) Voltage protection (over/under).

3) Phase reversal protection.

b. Manual Reset:

1) Evaporator low pressure.

2) High motor winding temperature.

3) Low chilled water temperature.

4) Low chilled water flow.

5) High condenser refrigerant discharge pressure.

6) Motor current overload and phase loss.

7) Low oil flow.

5. Building Automation System (BAS) Communications via Shielded Cable:

a. Minimum Data Transmission to BAS:

1) All system operating conditions.

2) Capacity control information.

3) Safety shutdown conditions.

b. Minimum Operating Commands from BAS:

1) Remote unit start/stop.

2) Remote chilled water reset.

2.9 BUILDING AUTOMATION SYSTEM (BAS) INTERFACE:

A. The manufacturer shall provide the hardware and software necessary to permit the monitoring and control of the chiller from the existing JCI Building Automation System. Provide termination for remote signaling of system status and alarms. Provide BACnet open protocol for interface with the BAS.

B. The information communicated between the BAS and the factory mounted unit controllers shall include the reading and writing of data to allow unit monitoring, control and alarm notification as specified in the unit sequence of operation and the unit points list.

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C. Points for BAS Control and Monitoring:

1. Interface shall include refrigerant temperatures and pressures, chilled water entering and leaving temperatures, remote reset control, electrical information including volts and amps in each phase and all specific safety and cycling shutdowns displayed at the chiller control panel.

2. Relay output energized upon detecting a fault requiring manual reset.

3. Relay output energized whenever unit is operating in a limit mode for an extended period of time.

4. Analog input to control leaving chilled water temperature set-point based upon a 4-20ma or 0-10 VDC signal from the building automation system.

5. Programmable soft during pull-down period via ramped current limit or fully adjustable, temperature pull-down rate.

6. Leaving chilled water reset temperature.

2.10 POWER WIRING

A. Provide factory wired units with a single point of electrical connection and grounding lug.

B. Provide across-the-line starter, non-recycling compressor overload, starter relay for each compressor. Provide manual reset current overload protection.

C. Minimum short circuit rating: 42,000 amperes rms symmetrical.

D. Provide starter relay for each condenser fan and motor with built-in overload protection.

E. Power block terminals shall be provided for different wire size connections. Wiring shall be numbered and color coded for ease of trouble-shooting.

F. Provide a surge capacitor and lightning arrestor in starter cabinet for protection from power surges due to lightning and switching transients.

G. Ground shall be #6 A.W.G. Provide separate driven ground for ground mounted and connect to building steel for roof mounted units.

H. Provide motor protector.

I. Provide separate power connection for power for evaporator heat tape.

J. Provide unit mounted GFCI WP duplex for maintenance.

K. Control Power Transformers: 120 volt secondary. 45 VA minimum. Provide fused primary, secondary, and bond unfused leg of secondary to enclosure.

L. Exposed compressor and fan motor power wiring shall be routed in liquid tight conduit.

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PART 3 EXECUTION

3.1 INSTALLATION

A. Install in accordance with manufacturer's instructions.

B. Align chiller package on steel or concrete foundations.

C. Install units on vibration isolators.

D. Connect to electrical service.

E. Connect to chilled water piping. Install strainer supplied with chiller on return to chiller for braized plate heat exchangers.

F. Water Piping:

1. Piping shall be aligned and supported to eliminate all stresses on flanges and nozzles before tightening bolts.

2. Arrange piping for easy dismantling to permit tube cleaning.

3. Ball vent and ball drain valves with hose end connection shall be installed.

G. Tubing and Wiring: Installed in ducts or conduit running horizontally or vertically. Vertical runs shall be bent to conform to machine surfaces. Free hanging capillaries and wires will not be accepted

H. Connect to primary electrical service. Provide a separate 120 volt circuit if required by the chiller manufacturer for the evaporator freeze protection heaters.

I. Arrange piping for easy dismantling to permit tube cleaning and removal.

3.2 STARTING EQUIPMENT

A. Start no equipment or systems until all prefunctional checklists have been completed and approved by the manufacturer's representative.

B. Provide services of factory trained representative for minimum one day to leak test, refrigerant pressure test, start-up, commission the machine and calibrate controls. The technician shall observe a minimum of four (4) hours of operation for the chiller and shall submit a log of all chiller operating conditions during this period.

C. Supply initial charge of refrigerant and oil.

D. Provide start-up certificate in accordance with the General Conditions.

3.3 CLOSEOUT ACTIVITIES

A. See Section 01 7800 - Closeout Submittals, for closeout submittals.

B. See Section 01 7900 - Demonstration and Training, for additional requirements.

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C. Demonstration: Demonstrate operation of system to the Owner's personnel.

1. Use operation and maintenance data as reference during demonstration.

2. Briefly describe function, operation, and maintenance of each component.

D. Training: Train the Owner's personnel on operation and maintenance of system.

1. Use operation and maintenance manual as training reference, supplemented with additional training materials as required.

2. Provide minimum of two hours of training.

3. Instructor: Manufacturer's training personnel.

4. Location: At project site.

3.4 SCHEDULES

A. Refer to schedule on Drawings.

END OF SECTION