MTA TAEevo TECH Guide Spec.pdf
PDF 145 KB Posted
- Attached to
- Buckley SFB - BDOC Chiller Replacement
- Solicitation number
- FA254326Q0027
About this file
This is a technical specification document for air-cooled scroll water chillers conforming to industry standard Section 23 64 23.13.
The specification requires factory-assembled and tested chillers featuring one or more hermetic scroll compressors, finned coil evaporators immersed in pressurized buffer tanks, air-cooled condensers, and integrated controls. Units must operate reliably between -4°F and 109°F ambient temperature, with leaving solution temperatures ranging from 15°F to 86°F and inlet solution temperatures from 25°F to 95°F. All components must be mounted in unitized construction with single-point power connection. Chillers must include crankcase heaters, level sensors in evaporator tanks, ½-inch insulation of closed cell foam, and vent/drain connections with ball valves. Optional configurations include integrated pumps with nominal head pressures of 43 psig or 72 psig. Air-cooled condensers utilize aluminum fins, copper tubes, and galvanized steel casings with axial fans directly connected to UL-marked electric motors. Electrical systems must be UL508A-compliant, NEMA 3R rated, with 460-volt, 3-phase, 60-hertz power (230-volt option available for models up to model 161). Controllers must be standalone, microprocessor-based systems with nonvolatile memory, freeze protection, low-limit controls, pump interlocking capabilities, and MODBUS protocol communication. Each chiller requires comprehensive factory testing per ISA/IEC 17050-1, including component verification, electrical checks, pressure tests, and leak detection. The specified manufacturer is MTA (now part of Trane), with alternate manufacturers requiring prior written engineer approval. Units include one-year parts and labor warranty with factory-authorized startup and local technician support. Standard domestic North America packaging is provided, with chillers capable of withstanding indefinite storage at temperatures between -4°F and 120°F.
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Text version
SECTION 23 64 23.13 -AIR-COOLED SCROLL WATER CHILLERS
GENERAL
1.1 SUMMARY
A. This Section includes design, performance criteria, refrigerants, controls, and installation requirements for air cooled scroll chillers.
1.2 PERFORMANCE REQUIREMENTS
A. Unit shall consist of one or more scroll compressors, finned coil evaporator immersed in a pressure rated buffer tank, air cooled condenser, and operating controls with equipment protection.
B. Performance: Refer to schedule for specific operating conditions
C. Chiller shall be equipped for single-point power connection.
1.3 SUBMITTALS
A. Product Data: For each type of product indicated. Include refrigerant, rated capacities, operating characteristics, furnished specialties, and accessories.
1. Dimensioned plan and including required service clearances and location of all field piping and electrical connections.
2. Performance at application specific conditions.
3. Electrical and water quality requirements during operation, standby and shutdown.
4. Installation and Operating Manuals
5. Fluid capacity of evaporator.
6. Wiring Diagrams: For power, signal, and control wiring.
7. Refrigeration diagram for the chiller.
1.4 QUALITY ASSURANCE
A. Each chiller shall be tested in accordance with ISA/IEC 17050-1.
B. Each chiller shall come with a testing certificate verifying that the following quality checks:
1. All components have been checked to ensure secure fitting to the unit.
2. The following checks have been completed on the electrical equipment:
a. Grounding of all electronics
b. Insulation resistance
c. Voltage
d. Residual voltage
3. Verification of the control circuit including any pressure and temperature transducers that may be present.
4. Ensuring proper rotation direction of fans, pumps, and compressors
5. Settings for nominal flow and verification of pump head (if pump is present)
6. Operation of level sensor in the evaporator
7. Trip pressure of condenser pressure switches and high and low pressure switches
8. Verification of safety devices
C. Any parts subject to pressure shall be tested to their maximum working pressure, including verification of the refrigerant circuit, and hydraulic pressure through the evaporator.
D. The refrigerant and hydraulic circuits shall be verified to ensure that there are no leaks.
1.5 DELIVERY, STORAGE, AND HANDLING
A. Ship each chiller with a full charge of refrigerant. Charge each chiller with nitrogen if refrigerant is shipped in containers separate from chiller.
B. Package chiller for domestic shipping with a North America destination. Export packaging and shipping is available.
C. Chiller shall be capable of withstanding -4⁰F (-20⁰C) to 120⁰F (48⁰C) storage temperatures for an indefinite period of time.
1.6 WARRANTY AND START-UP
A. Units shall come with a standard 1-year parts, and labor warranty.
B. Start-up shall be completed by factory authorized personnel.
C. Manufacturer must have a local technician (cannot be flown in) to service chiller and meet warranty requirements.
PART 2 - PRODUCTS
2.1 MANUFACTURERS
A. MTA - Now Part of Trane
B. Alternate manufacturers must have prior written approval by the engineer of record before the bidding process.
2.2 MANUFACTURED UNIT
A. Description: Factory-assembled and tested chiller complete with hermetic compressor, evaporator, condenser, controls, interconnecting unit piping and wiring, and indicated accessories.
B. Chiller Frame and Housing - All components shall be mounted onto a unitized construction.
Compressors and controls shall be contained within a sheet metal enclosure to protect critical components from the external conditions.
C. [Optional] Chiller must include a pump with a nominal head pressure of 43 psig for the evaporator fluid that is integrated within the frame of the chiller.
D. [Optional] Chiller must include a pump with a nominal head pressure of 72 psig for the evaporator fluid that is integrated within the frame of the chiller.
E. DESIGN REQUIREMENTS
1. Unit shall consist of one or more scroll compressors, finned coil evaporator immersed in a buffer tank, and operating controls with equipment protection.
2. Chiller shall be equipped for single-point power connection, unless otherwise specified.
3. All pumps and water tanks shall be integrated within the frame of the chiller.
F. Chiller Operation
1. Chiller shall be capable of starting and running at ambient temperatures from -4⁰F to 109⁰F
(-20°C to 42⁰C).
2. Chiller shall be capable of operating with a leaving solution temperature range 15⁰F to 86⁰F (-10°C to 30⁰C).
3. Chiller shall be capable of operating with an inlet solution temperature range of 25°F to
95°F (-5°C to 35°C).
2.3 COMPRESSORS
A. Description: Refrigerant compressors with orbiting scrolls, 2-pole electric motor on rubber antivibration dampers.
B. A crankcase heater shall be provided and turn on when the unit stops running to prevent dilution of the oil when the compressor is off.
C. The compressors shall be installed in a compartment separate from the condenser section to allow for maintenance on the unit while it is running.
2.4 EVAPORATOR
A. Description: The finned tube coil with copper tubes and aluminum fins and galvanized steel casing.
B. The evaporator coil shall be immersed in a pressurized buffer tank to provide onboard storage of a low temperature coolant.
C. The evaporator tank shall include baffles to guide water across the tubes and provide a flow path that is resistant to fouling with a low coolant pressure drop.
D. The buffer tank shall include a level sensor to protect the pump and to avoid pumping water during a leak.
E. The evaporator tank shall be insulated with 1/2” of closed cell foam.
F. The evaporator tank shall have a ½” vent connection and ½” drain connection with ball valves.
2.5 AIR COOLED CONDENSER
A. Air cooled packaged chillers and controls shall be capable of reliable operation between - 4°F [optional -4°] and 109°F ambient air temperature.
B. Air-cooled condensers shall utilize aluminum fins with refrigeration-duty copper tubes and galvanized steel casing.
C. [TAEevo TECH 020 – 602] The positioning of condenser coils shall only be on one side of the chiller, to allow for installation where available floor space is limited, next to walls or other obstacles.
D. [TAEevo TECH 031- 802] The condenser shall be protected by removable and cleanable metal filters protect the condenser coils from contamination.
E. The chiller shall be provided with axial fans directly connected to the UL marked electric motor.
F. The fans shall be statically and dynamically balanced and equipped with external safety grilles.
G. [Optional for TAEevo TECH 031 – 802] The condenser fans motors shall be EC brushless motors with head pressure control to allow for low ambient operation.
2.6 ELECTRICAL
A. Factory installed and wired, and functionally tested at factory before shipment.
B. Terminal blocks with numbered wiring to match wiring diagram. Spare wiring terminal block for connection to external controls.
C. The electrical cabinet shall be designed, wired, and labeled in compliance with UL508A.
D. The electrical cabinet shall be NEMA 3R rated (or equivalent).
E. The chiller controller shall be mounted to the door of the electrical cabinet, and be protected by an openable transparent polycarbonate cover.
F. The electrical panel door shall be equipped with a main disconnect switch with safety door lock to prevent the electrical cabinet door from being opened with the power on to the unit.
G. The power section shall include automatic thermal-magnetic cut-outs, and a phase monitor for the protection of compressors, fans, and centrifugal pumps.
H. Chiller must be 460 volts, 3 phase, and 60 hertz. (Option for models up to model 161 of 230 volt, 3 phase, and 60 hertz).
2.7 CHILLER 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. The controller fitted to the chiller package shall be an embedded real- time microprocessor device that utilizes control software written specifically for chiller applications. User operation shall be accomplished by using either a LED push button interface or an LCD graphic interface.
C. The self-contained controls system controls all temperature controls along with the safeties and alarming.
D. Chiller shall provide evaporator freeze protection and low limit control to avoid low evaporator refrigerant temperature trip-outs during critical periods of chiller operation.
E. Chiller shall be interlocked with pump to disable the pump when the tank level is low to avoid the pump running dry.
F. Controller shall be capable of communicating via MODBUS protocol.
File details come from the government source that posted it. Updated .