Attachment_1D_-_Technical_Specification.docx

Department of General Services BU 7760 Event ID 0000036539 Procurement Division Attachment 1D

CENTRIFUGAL WATER CHILLERS

23 64 16 - 10 000000000009478

PART 1 GENERAL

1.01 SECTION INCLUDES

SECTION 23 64 16 CENTRIFUGAL WATER CHILLERS

A. Compressor-Drive Assembly.

B. Refrigeration.

C. Evaporator.

D. Condenser.

E. Insulation.

F. Electrical.

G. Variable Frequency Controller.

H. Controls.

I. Finish.

J. Accessories.

1.02 GENERAL REFERENCES

A. Division 20, including all Common Mechanical Requirements in Section 20 00 00, apply to this Section. Requirements noted in this Section are supplemental to the requirements of these General References.

1.03 RELATED REQUIREMENTS

A. Section 20 05 13 - Common Mechanical Motor Requirements.

B. Section 20 05 48 - Vibration and Seismic Controls C. Section 20 05 53 - Mechanical Identification D. Section 23 05 93 - Testing, Adjusting, and Balancing for HVAC.

E. Section 20 08 00 - Mechanical Commissioning F. Section 23 21 13 - Hydronic Piping.

G. Section 23 21 16 - Hydronic Piping Specialties H. Section 23 21 23 - Hydronic Pumps.

I. Section 23 25 00 - HVAC Water Treatment.

J. See structural and electrical drawings for further design criteria

1.04 REFERENCE STANDARDS

A. AHRI 110 - Air-conditioning, Heating, and Refrigerating Equipment Nameplate Voltages; Latest Edition.

B. AHRI 575 - Method of Measuring Machinery Sound Within an Equipment Space; Latest Edition.

C. AHRI 580 - Non-Condensable Gas Purge Equipment for Use with Low-Pressure Centrifugal Liquid Chillers; Latest Edition.

D. ASHRAE Std 15 - Safety Standard for Refrigeration Systems; 2024, with Errata (2025).

E. ASHRAE Std 34 - Designation and Safety Classification of Refrigerants; 2024, with Addendum (2025).

F. ASHRAE Std 135 - BACnet - A Data Communication Protocol for Building Automation and Control Networks; 2024, with Errata (2025).

G. ASHRAE Std 147 - Reducing the Release of Halogenated Refrigerants from Refrigerating and Air-Conditioning Equipment and Systems; 2019, with Addendum (2024).

H. ASME B16.5 - Pipe Flanges and Flanged Fittings: NPS 1/2 Through NPS 24 Metric/Inch Standard; 2025.

I. ASME BPVC-Vlll-1 - Boiler and Pressure Vessel Code, Section VIII, Division 1: Rules for Construction of Pressure Vessels; 2023, with Errata (2024).

J. ASTM C534/C534M - Standard Specification for Preformed Flexible Elastomeric Cellular Thermal Insulation in Sheet and Tubular Form; 2025.

K. IEC 60947-4-1 - Low-voltage switchgear and control gear - Part 4-1: Contactors and motor starters - Electromechanical contactors and motor-starters; Latest Edition.

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

M. NEMA AB 1 - Molded-Case Circuit Breakers, Molded Case Switches, and Circuit-Breaker Enclosures; Latest Edition.

N. NEMA ICS 2 - Industrial Control and Systems Controllers, Contactors and Overload Relays Rated 600 Volts; 2008 (Reaffirmed 2020).

0. NEMA BS 31047 - Heavy Duty Enclosed and Dead-Front Switches (600 Volts Maximum); 2013 (Reaffirmed 2023).

P. NFPA 70 - National Electrical Code; Most Recent Edition Adopted by Authority Having Jurisdiction, Including All Applicable Amendments and Supplements.

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

1.05 SUBMITTAL$

A. Action Submittals

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

2. 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.

3. Manufacturer's Certificate: Certify that components of package not furnished by manufacturer have been selected in accordance with manufacturer's requirements.

4. Test Reports: Indicate energy input versus cooling load output from O to 100 percent of full load at specified and minimum condenser water temperature.

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

B. Operation and Maintenance Materials

1. Include start-up instructions, maintenance data, parts lists, controls, and accessories. Include trouble- shooting guide.

1.06 WARRANTIES

A. Provide a one-year warranty to include coverage for compressor including and complete chiller package as manufactured and delivered to site including materials.

B. Variable Frequency Drives of Variable Speed Drives: Provide manufacturer warranty for period of twelve months from date of installation or eighteen months from date of shipment whichever comes first. Warranty to include parts, labor, travel costs, and living expenses incurred by manufacturer to provide factory-authorized on-site services.

1.07 QUALITY ASSURANCE

A. Manufacturer Qualifications: Company specializing in manufacturing the Products specified in this section with minimum three years documented experience.

B. Products Requiring Electrical Connection: Listed and classified by Underwriters Laboratories Inc. as suitable for the purpose specified and indicated.

1.08 DELIVERY, STORAGE AND HANDLING

A. Comply with manufacturer's installation instructions for rigging, unloading, and transporting units.

PART 2 PRODUCTS

2.01 MANUFACTURERS

A. Daikin Applied.

B. Carrier Corporation.

C. Johnson Controls.

D. Trane.

2.02 MANUFACTURED UNIT

A. Description: Factory-assembled and -tested water-cooled chiller complete with semi hermetic, oil-free centrifugal compressor, compressor motor, compressor motor controller, lubrication system, evaporator, condenser, one or two magnetic bearings, heat-reclaim condenser as indicated, controls, interconnecting unit piping and wiring, and indicated accessories.

1. Disassemble chiller into major assemblies as required by the installation after factory testing and before packaging for shipment.

2. For chillers with dual compressors, provide each compressor with a dedicated motor and motor controller, and provide for continued operation when either compressor-drive assembly fails or is being serviced.

B. Fabricate chiller mounting base with reinforcement strong enough to resist chiller movement during a seismic event when chiller is anchored to field support structure.

2.03 COMPRESSOR-DRIVE ASSEMBLY

A. Description: Single-stage or multistage, variable-displacement, centrifugal-type compressor driven by an electric motor.

1. Where indicated, provide oil-free compressor technology using a permanent magnet synchronous motor, magnetic bearings, integral variable frequency controller, and digital electronic controls.

B. Compressor:

1. Casing: Cast iron, precision ground.

2. Impeller: High-strength cast aluminum or cast-aluminum alloy on carbon- or alloy-steel shaft.

C. Drive: Semi-hermetic design using an electric motor as the driver.

1. Gear Drives: For chillers with gear drives, provide single- or double-helical gear design continuously coated with oil while chiller is operating. Gears shall comply with American Gear Manufacturer Association standards.

2. Drive Coupling: For chillers with open drives, provide flexible disc with all-metal construction and no wearing parts to ensure long life without the need for lubrication.

3. Seals: Seal drive assembly to prevent refrigerant leakage.

D. Compressor Motor:

1. Continuous duty, squirrel-cage, induction-type, two-pole motor with energy efficiency required to suit chiller energy efficiency indicated.

2. Factory mounted, aligned, and balanced as part of compressor assembly before shipping.

3. Motor shall be of sufficient capacity to drive compressor throughout entire operating range without overload and with sufficient capacity to start and accelerate compressor without damage.

4. For chillers with open drives, provide motor with open-drip proof enclosure.

5. Provide motor with thermistor or RTD in single motor winding to monitor temperature and report information to chiller control panel.

6. Provide motor with thermistor or RTD to monitor bearing temperature and report information to chiller control panel.

7. Provide open-drive motor with internal electric heater, internally powered from chiller power supply.

E. Vibration Balance: Balance chiller compressor and drive assembly to provide a precision balance that is free of noticeable vibration over the entire operating range.

1. Overspeed Test: 25 percent above design operating speed.

F. Service: Easily accessible for inspection and service.

1. Compressor's internal components shall be accessible without having to remove compressor-drive assembly from chiller.

2. Provide lifting lugs or eyebolts attached to casing.

G. Economizers: For multistage chillers, provide interstage economizers.

H. Capacity Control: Modulating, variable-inlet, guide-vane assembly combined with hot-gas bypass, if necessary, to achieve performance indicated.

1. Maintain stable operation that is free of surge, cavitation, and vibration throughout range of operation. Configure to achieve most energy-efficient operation possible.

2. Operating Range: From 100 to 15 percent of design capacity.

3. Condenser-Fluid Unloading Requirements over Operating Range: Constant-design entering condenser-fluid temperature.

4. Provide chillers with variable frequency controllers which shall modulate compressor speed with variable-inlet, guide-vane control to achieve optimum energy efficiency.

2.04 REFRIGERATION

A. Refrigerant:

1. Type: R-513a.

2. Compatibility: Chiller parts exposed to refrigerants shall be fully compatible with refrigerants, and pressure components shall be rated for refrigerant pressures.

B. Refrigerant Flow Control: Manufacturer's standard refrigerant flow-control device satisfying performance requirements indicated.

C. Pressure Relief Device:

1. Comply with requirements in ASHRAE Std 15 and in applicable portions of ASME BPVC- VIII-1.

D. Refrigeration Transfer: Provide service valves and other factory-installed accessories required to facilitate transfer of refrigerant from chiller to a remote refrigerant storage and recycling system. Comply with requirements in ASHRAE Std 15 and ASHRAE Std 147.

E. Purge System:

1. For chillers operating at sub atmospheric pressures , factory install an automatic purge system for collection and return of refrigerant and for removal of noncontinuable including, but not limited to, water, water vapor, and no condensable gases.

2. System shall be a thermal purge design, refrigerant or air cooled, equipped with a carbon filter that includes an automatic regeneration cycle.

3. Factory wire to chiller's main power supply and system complete with controls, piping, and refrigerant valves to isolate the purge system from the chiller.

4. Construct components of noncorrodible materials.

5. Controls shall interface with chiller control panel to indicate modes of operation, set points, data reports, diagnostics, and alarms.

6. Efficiency of not more than 0.02 lb. of refrigerant per pound of air when rated according to ARI 580.

7. Operation independent of chiller per ASHRAE Std 147.

2.05 EVAPORATOR

A. Description: Shell-and-tube design with water in tubes and refrigerant surrounding tubes within shell. Shell is separate from condenser.

B. Shell Material: Carbon-steel rolled plates with continuously welded seams or seamless pipe.

C. Designed to prevent liquid refrigerant carryover from entering compressor.

D. Provide evaporator with sight glass or other form of positive visual verification of liquid- refrigerant level.

E. Tubes:

1. Individually replaceable from either end and without damage to tube sheets and other tubes.

2. Mechanically expanded into end sheets and physically attached to intermediate tube sheets.

3. Material: Copper.

4. Nominal OD: Manufacturer's choice.

5. Minimum Wall Thickness: 0.025 inch (0.6 mm).

6. External Finish: Manufacturer's standard.

7. Internal Finish: Enhanced.

F. End Tube Sheets: Continuously welded to each end of shell; drilled and reamed to accommodate tubes with positive seal between fluid in tubes and refrigerant in shell.

G. Intermediate Tube Sheets: Installed in shell and spaced along length of tube at intervals required to eliminate vibration and to avoid contact of tubes resulting in abrasion and wear.

H. Water Box:

1. Cast-iron or carbon-steel construction; arranged to provide visual inspection and cleaning of tubes from either end without disturbing refrigerant in shell.

2. Standard type for water box with piping connections. Standard type for water box without piping connections.

3. Provide water boxes and marine water-box covers with lifting lugs or eyebolts.

4. Hinged water boxes.

5. Hinged marine water-box covers.

6. Nozzle Pipe Connections: Welded, ASME B16.5 , flat-face flange.

7. Thermistor or RTD temperature sensor factory installed in each nozzle.

8. Fit each water box with 3/4-inch (19-mm) drain connection at low point and vent connection at high point, each with threaded plug.

I. Additional Corrosion Protection:

1. Electrolytic corrosion-inhibitor anode.

2. Coat wet surfaces with a corrosion-resistant finish.

3. Using same material as tubes, clad surfaces of end tube sheets in contact with fluid. Coat other wet surfaces, including water boxes, with a corrosion-resistant finish.

2.06 CONDENSER

A. Description: Shell-and-tube design with water in tubes and refrigerant surrounding tubes within shell. Shell is separate from evaporator.

B. Shell Material: Carbon-steel rolled plates with continuously welded seams or seamless pipe.

C. Designed to prevent direct impingement of high-velocity hot gas from compressor discharge on tubes.

D. Provide condenser with sight glass or other form of positive visual verification of refrigerant charge and condition.

E. Tubes:

1. Individually replaceable from either end and without damage to tube sheets and other tubes.

2. Mechanically expanded into end sheets and physically attached to intermediate tube sheets.

3. Material: Copper.

4. Nominal OD: Manufacturer's choice.

5. Minimum Wall Thickness: 0.025 inch (0.6 mm).

6. External Finish: Manufacturer's standard.

7. Internal Finish: Enhanced.

F. End Tube Sheets: Continuously welded to each end of shell; drilled and reamed to accommodate tubes with positive seal between fluid in tubes and refrigerant in shell.

G. Intermediate Tube Sheets: Installed in shell and spaced along length of tube at intervals required to eliminate vibration and to avoid contact of tubes resulting in abrasion and wear.

H. Water Box:

1. Cast-iron or carbon-steel construction; arranged to provide visual inspection and cleaning of tubes from either end without disturbing refrigerant in shell.

2. Standard type for water box with piping connections. Standard type for water box without piping connections.

3. Provide water boxes with lifting lugs or eyebolts.

4. Hinged water boxes.

5. Hinged marine water-box covers.

6. Nozzle Pipe Connections: Grooved for mechanical-joint coupling.

7. Thermistor or RTD temperature sensor factory installed in each nozzle.

8. Fit each water box with 3/4-inch (19-mm) drain connection at low point and vent connection at high point, each with threaded plug.

I. Additional Corrosion Protection:

1. Electrolytic corrosion-inhibitor anode.

2. Coat wet surfaces with a corrosion-resistant finish.

3. Using same material as tubes, clad surfaces of end tube sheets in contact with fluid. Coat other wet surfaces, including water boxes, with a corrosion-resistant finish.

2.07 INSULATION

A. Closed-cell, flexible elastomeric thermal insulation complying with ASTM C534/C534M, Type I for tubular materials and Type II for sheet materials.

1. Thickness: 3/4 inch (19 mm).

B. Adhesive: As recommended by insulation manufacturer.

C. Factory-applied insulation over all cold surfaces of chiller capable of forming condensation. Components shall include, but not be limited to, evaporator shell and end tube sheets, evaporator water boxes including nozzles, refrigerant suction pipe from evaporator to compressor, cold surfaces of compressor, refrigerant-cooled motor, and auxiliary piping.

1. Apply adhesive to 100 percent of insulation contact surface.

2. Before insulating steel surfaces, prepare surfaces for paint, and prime and paint as indicated for other painted components. Do not insulate unpainted steel surfaces.

3. Seal seams and joints to provide a vapor barrier.

4. After adhesive has fully cured, paint exposed surfaces of insulation to match other painted parts.

2.08 ELECTRICAL

A. Factory installed and wired and functionally tested at factory before shipment.

B. Single-point, field-power connection to confused disconnect switch. Minimum withstand rating shall be as required by electrical power distribution system, but not less than 65,000 A.

1. Branch power circuit to each motor, electric heater, dedicated electrical load, and controls with disconnect switch or circuit breaker.

a. NEMA BS 31047, heavy-duty, fusible switch with rejection-type fuse clips rated for fuses. Select and size fuses to provide Type 2 protection according to IEC 60947-4- 1.

b. NEMA AB 1, motor-circuit protector (circuit breaker) with field-adjustable, short- circuit-trip set point.

2. NEMA ICS 2-rated motor controller for auxiliary motors, hand-off-auto switch, and overcurrent protection for each motor. Provide variable frequency controller for each variable-speed motor furnished.

3. Control-circuit transformer with primary and secondary side fuses.

C. Terminal blocks with numbered and color-coded wiring to match wiring diagram. Spare wiring terminal block for connection to external controls or equipment.

D. Factory-installed wiring outside of enclosures shall be in metal raceway except make terminal connections with not more than a 24-inch length of liquid tight conduit.

E. Factory install and wire capacitor bank for the purpose of power factor correction to 0.95 at all operating conditions.

1. If capacitors are mounted in a dedicated enclosure, use same NEMA enclosure type as motor controller. Provide enclosure with service entrance knockouts and bushings for conduit.

2. Capacitors shall be non-PCB dielectric fluid, metallized electrode design, low loss with low-temperature rise. The kVAr ratings shall be indicated and shall not exceed the maximum limitations set by NFPA 70. Provide individual cells as required.

3. Provide each cell with current-limiting replaceable fuses and carbon-film discharge resistors to reduce residual voltage to less than 50 V within one minute after de- energizing.

4. Provide a ground terminal and a terminal block or individual connectors for phase connection.

2.09 VARIABLE FREQUENCY CONTROLLER

A. Motor controller shall be factory mounted and wired on the chiller to provide a single-point, field- power termination to the chiller and its auxiliaries.

B. Description: NEMA ICS 2; listed and labeled as a complete unit and arranged to provide variable speed by adjusting output voltage and frequency.

C. Enclosure: Unit mounted, NEMA EN 10250, Type 1, with hinged full-front access door with lock and key.

D. Integral Disconnecting Means: Door-interlocked, NEMA AB 1, instantaneous-trip circuit breaker with lockable handle. Minimum withstand rating shall be as required by electrical power distribution system, but not less than 65,000 A.

E. Technology: Pulse width modulated (PWM) output with insulated gate bipolar transistors (IGBT); suitable for variable torque loads.

F. Controller shall consist of a rectifier converter section, a digital/analog driver regulator section, and an inverter output section.

1. Rectifier section shall be a full-wave diode bridge that changes fixed-voltage, fixed- frequency, ac line power to a fixed dc voltage. Silicon controller rectifiers, current source inverters, and paralleling of devices are unacceptable. Rectifier shall be insensitive to phase rotation of the ac line.

2. Regulator shall provide full digital control of frequency and voltage.

3. Inverter section shall change fixed dc voltage to variable-frequency, variable ac voltage, for application to a squirrel-cage motor. Inverter shall produce a sine-coded, pulse width modulated (PWM) output wave form and shall conduct no radio-frequency interference back to the input power supply.

G. Output Rating: Three phase; with voltage proportional to frequency throughout voltage range.

H. Operating Requirements:

1. Input AC Voltage Tolerance: 460-V ac, plus 10 percent or 506 V maximum .

2. Input frequency tolerance of 60 Hz, plus or minus 2 Hz.

3. Capable of driving full load, without derating, under the following conditions:

a. Ambient Temperature: 0 to 50 deg C.

b. Relative Humidity: Up to 90 percent (noncondensing).

c. Altitude: 3300 feet (1005 m).

4. Minimum Efficiency: 96 percent at 60 Hz, full load.

5. Minimum Displacement Primary-Side Power Factor: 95 percent without harmonic filter, 98 percent with harmonic filter.

6. Overload Capability: 1.05 times the full-load current for 7 seconds.

7. Starting Torque: As required by compressor-drive assembly.

8. Speed Regulation: Plus or minus 1 percent.

9. Isolated control interface to allow controller to follow control signal over a 10:1 speed range.

10. To avoid equipment resonant vibrations, provide critical speed lockout circuitry to allow bands of operating frequency at which controller shall not operate continuously.

11. Capable of being restarted into a motor coasting in either the forward or reverse direction without tripping.

I. Internal Adjustability Capabilities:

1. Minimum Output Frequency: 6 Hz.

2. Maximum Output Frequency: 60 Hz.

3. Acceleration: 2 seconds to a minimum of 60 seconds.

4. Deceleration: 2 seconds to a minimum of 60 seconds.

5. Current Limit: 30 percent to a minimum of 100 percent of maximum rating.

J. Self-Protection and Reliability Features: Subjecting the controller to any of the following conditions shall not result in component failure or the need for replacement:

1. Overtemperature.

2. Short circuit at controller output.

3. Ground fault at controller output. Variable frequency controller shall be able to start a grounded motor.

4. Open circuit at controller output.

5. Input undervoltage.

6. Input overvoltage.

7. Loss of input phase.

8. Reverse phase.

9. AC line switching transients.

10. Instantaneous overload, line to line or line to ground.

11. Sustained overload exceeding 100 percent of controller rated current.

12. Starting a rotating motor.

K. Motor Protection: Controller shall protect motor against overvoltage and undervoltage, phase loss, reverse phase, overcurrent, overtemperature, and ground fault.

L. Automatic Reset and Restart: Capable of three restarts after controller fault or on return of power after an interruption and before shutting down for manual reset or fault correction. Controller shall be capable of automatic restart on phase-loss and overvoltage and undervoltage trips.

M. Visual Indication: On face of controller enclosure or chiller control enclosure; indicating the following conditions:

1. Power on.

2. Run.

3. Overvoltage.

4. Line fault.

5. Overcurrent.

6. External fault.

7. Motor speed (percent).

8. Fault or alarm status (code).

9. DC-link voltage.

10. Motor output voltage.

11. Input kilovolt amperes.

12. Total power factor.

13. Input kilowatts.

14. Input kilowatt-hours.

15. Three-phase input voltage.

16. Three-phase output voltage.

17. Three-phase input current.

18. Three-phase output current.

19. Three-phase input voltage total harmonic distortion.

20. Three-phase input current total harmonic distortion.

21. Output frequency (Hertz).

22. Elapsed operating time (hours).

23. Diagnostic and service parameters.

N. Operator Interface: At controller or chiller control panel; with start-stop and auto-manual selector with manual-speed-control potentiometer.

O. Control Signal Interface:

1. Electric Input Signal Interface: A minimum of two analog inputs (0 to 10 V or 0/4-20 mA) and six programmable digital inputs.

P. Active Harmonic Distortion Filter: Factory mounted and wired to limit total voltage and current distortion to 5 percent.

Q. Input Line Conditioning: .

R. Cooling: Air cooled.

S. Accessories: Devices shall be factory installed in controller enclosure unless otherwise indicated.

1. Control Relays: Auxiliary and adjustable time-delay relays.

T. Chiller Capacity Control Interface: Equip chiller with adaptive control logic to automatically adjust the compressor motor speed and the compressor pre-rotation inlet vane position independently to achieve maximum part-load efficiency in response to sensor inputs that are integral to the chiller controls.

2.10 CONTROLS

A. Control: Standalone and microprocessor based, with all memory stored in nonvolatile memory so that reprogramming is not required on loss of electrical power.

B. Enclosure: Unit mounted, NEMA EN 10250, Type 1, hinged or lockable; factory wired with a single-point, field-power connection and a separate control circuit.

C. Operator Interface: Multiple-character digital or graphic display with dynamic update of information and with keypad or touch-sensitive display located on front of control enclosure. In either imperial or metric units selectable through the interface, display the following information:

1. Date and time.

2. Operating or alarm status.

3. Fault history with not less than last 10 faults displayed.

4. Set points of controllable parameters.

5. Trend data.

6. Operating hours.

7. Number of chiller starts.

8. Outdoor-air temperature or space temperature if required for chilled-water reset.

9. Entering- and leaving-fluid temperatures of evaporator and condenser.

10. Difference in fluid temperatures of evaporator and condenser.

11. Fluid flow of evaporator and condenser.

12. Fluid pressure drop of evaporator and condenser.

13. Refrigerant pressures in evaporator and condenser.

14. Refrigerant saturation temperature in evaporator and condenser shell.

15. Compressor refrigerant suction and discharge temperature.

16. Compressor bearing temperature.

17. Motor bearing temperature.

18. Motor winding temperature.

19. Oil temperature.

20. Oil discharge pressure.

21. Phase current.

22. Percent of motor rated load amperage.

23. Phase voltage.

24. Demand power (kilowatts).

25. Energy use (kilowatt-hours).

26. Power factor.

27. For chillers equipped with variable frequency controllers and harmonic filters, include the following:

a. Output voltage and frequency.

b. Voltage total harmonic distortion for each phase.

c. Supply current total demand distortion for each phase.

d. Inlet vane position.

e. Controller internal ambient temperature.

f. Heatsink temperature.

28. Purge suction temperature if purge system is provided.

29. Purge elapsed time if purge system is provided.

D. Control Functions:

1. Manual or automatic startup and shutdown time schedule.

2. Entering and leaving chilled-water temperatures, control set points, and motor load limits. Evaporator fluid temperature shall be reset based on return-water temperature.

3. Current limit and demand limit.

4. Condenser-fluid temperature.

5. External chiller emergency stop.

6. Variable evaporator flow.

7. Thermal storage.

8. Heat reclaim.

E. Manually Reset Safety Controls: The following conditions shall shut down chiller and require manual reset:

1. Low evaporator pressure; high condenser pressure.

2. Low evaporator fluid temperature.

3. Low oil differential pressure.

4. High or low oil pressure.

5. High oil temperature.

6. High compressor-discharge temperature.

7. Loss of condenser-fluid flow.

8. Loss of evaporator fluid flow.

9. Motor overcurrent.

10. Motor overvoltage.

11. Motor undervoltage.

12. Motor phase reversal.

13. Motor phase failure.

14. Sensor- or detection-circuit fault.

15. Processor communication loss.

16. Motor controller fault.

17. Extended compressor surge.

18. Excessive air-leakage detection for chillers using R-123 refrigerant.

F. Trending: Capability to trend analog data of up to five parameters simultaneously over an adjustable period and frequency of polling.

G. Security Access: Provide electronic security access to controls through identification and password with at least three levels of access: view only; view and operate; and view, operate, and service.

H. Control Authority: At least four conditions: Off, local manual control at chiller, local automatic control at chiller, and automatic control through a remote source.

I. Communication Port: RS-232 port, USB 2.0 port, or equivalent connection capable of connecting a printer and a notebook computer.

J. BAS Interface: Factory-installed hardware and software to enable the BAS to monitor, control, and display chiller status and alarms.

1. Hardwired Points:

a. Monitoring: On-off status, common trouble alarm.

b. Control: On-off operation, chilled-water, discharge temperature set-point adjustment.

2. ASHRAE Std 135 (BACnet) communication interface with the BAS shall enable the BAS operator to remotely control and monitor the chiller from an operator workstation. Control features and monitoring points displayed locally at chiller control panel shall be available through the BAS.

2.11 FINISH

A. Paint chiller, using manufacturer's standard procedures, except comply with the following minimum requirements:

1. Provide at least one coat of primer with a total dry film thickness of at least 2 mils.

2. Provide at least two coats of alkyd-modified, vinyl enamel finish with a total dry film thickness of at least 4 mils.

3. Paint surfaces that are to be insulated before applying the insulation.

4. Paint installed insulation to match adjacent uninsulated surfaces.

5. Color of finish coat to be manufacturer's standard .

B. Provide Owner with quart container of paint used in application of topcoat to use in touchup applications after Project Closeout.

2.12 ACCESSORIES

A. Flow Switches:

1. Chiller manufacturer shall furnish a switch for each condenser and verify field-mounting location before installation. Paddle and pressure differential type switches are not acceptable.

a. Thermal-dispersion water flow switch B. Vibration Isolation:

1. Chiller manufacturer shall furnish vibration isolation for each chiller.

2. Neoprene Pad:

a. Two layers of 0.375-inch- thick, ribbed- or waffle-pattern neoprene pads separated by a 16-gage, stainless-steel plate.

b. Fabricate pads from 40- to 50-durometer neoprene.

c. Provide stainless-steel square bearing plate to load the pad uniformly between 20 and 40 psig with a 0.12- to 0.16-inch deflection.

C. Sound Barrier:

1. Furnish removable and reusable sound-barrier covers over the compressor housing, hermetic motor, compressor suction and discharge piping, and condenser shell.

2. Provide for repeated installation and removal without use of tape or calk.

3. Inner and outer cover shall consist of a PTFE-impregnated fiberglass cloth enclosing heavy-density, needled fiberglass insulation material with a mass-loaded vinyl acoustic barrier.

4. Covers shall be double sewn and lock stitched with edges folded and sewn so no raw cut edges are exposed.

5. Form covers around control devices, gages, conduit, piping, and supports without degrading sound-barrier performance.

6. Continuously lap all exposed seams at least 2 inches for better sound containment.

7. Permanently label each section of cover to indicate its location, description, size, and number sequence.

8. Randomly place stainless-steel quilting pins to prevent covers from shifting and sagging.

D. Tool Kit: Chiller manufacturer shall assemble a tool kit specially designed for use in serving the chiller(s) furnished. Include special tools required to service chiller components not readily available to Owner service personnel in performing routine maintenance. Place tools in a lockable case with hinged cover. Provide a list of each tool furnished and attach the list to underside of case cover.

2.13 SOURCE QUALITY CONTROL

A. Perform functional run tests of chillers before shipping.

B. For chillers located indoors, rate sound power level according to ARI 575.

2.14 CHILLERS WITH OPEN MOTORS

A. For chillers with open type motors provide the following:

1. Chilled water fan coil units in the chiller rooms with total cooling capacity equal to the heat dissipation of the chiller motors.

2. Provide FCUs with flexible piping connectors, INSULATED PIPING connected to the chilled water piping loop, power supply, control valves, shutoff valves and appurtenances, as required.

3. Provide FCUs with DOC controls and connect to the campus BMS system.

4. Submit design of the system, signed by a registered mechanical engineer.

5. Increase performance of primary chilled water pumps to account for additional fan coil units.

PART 3 EXECUTION

3.04 START UP SERVICE

A. Engage a factory-authorized service representative to perform startup service.

1. Complete installation and startup checks according to manufacturer's written instructions.

2. Verify that refrigerant charge is sufficient and chiller has been leak tested.

3. Verify that pumps are installed and functional.

4. Verify that thermometers and gages are installed.

5. Operate chiller for run-in period.

6. Check bearing lubrication and oil levels.

7. Verify that refrigerant pressure relief device is vented outside.

8. Verify proper motor rotation.

9. Verify static deflection of vibration isolators, including deflection during chiller startup and shutdown.

10. Verify and record performance of fluid flow and low-temperature interlocks for evaporator and condenser.

11. Verify and record performance of chiller protection devices.

12. Test and adjust controls and safeties. Replace damaged or malfunctioning controls and equipment.

B. Inspect field-assembled components, equipment installation, and piping and electrical connections for proper assembly, installation, and connection.

C. Prepare test and inspection startup reports.

3.05 DEMONSTRATION AND TRAINING

A. Engage a factory-authorized service representative to train Owner's maintenance personnel to adjust, operate, and maintain chillers.

B. Video record the training sessions.

END OF SECTION