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Guide specifications (cont) 4. All sensors shall have quick disconnects to allow replacement of the sensor without replacement of the entire sensor wire. Pressure transducers shall be capable of field calibration to ensure accurate readings and to avoid unnecessary transducer replacement. Transducers shall be serviceable without the need for refrigerant charge removal or isolation. 5. Transmission shall be single ratio, single helical, parallel shaft speed increaser. Gears shall con- form to AGMA Standards, Quality II. 6. Journal bearings shall be of the steel backed babbitt lined type. Aluminum journal bearings are not acceptable. The thrust bearing shall be tilting pad or rolling element type. 7. Centrifugal compressors shall use variable inlet guide vanes to provide capacity modulation while also providing pre-whirl of the refrigerant vapor entering the impeller for more efficient compression at all loads. 8. Centrifugal compressors shall be provided with a factory-installed lubrication system to deliver oil under pressure to bearings and transmission. Included in the system shall be: a. Hermetic driven rotary vane oil pump with factory-installed motor contactor with over- load protection. b. Refrigerant-cooled oil cooler. Water-cooled oil coolers are not acceptable. c. Oil pressure regulator. d. Oil filter with isolation valves to allow filter change without removal of refrigerant charge. e. Oil sump heater controlled from unit microprocessor. f. Oil reservoir temperature sensor with main control center digital readout. g. When factory-mounted compressor motor starter or VFD is provided, all wiring to oil pump, oil heater, and controls shall be pre- wired in the factory. h. Compressor shall be fully field serviceable. Compressors which must be removed and returned to the factory for service shall be unacceptable. C. Motor: 1. Compressor motor shall be of the semi- hermetic, liquid refrigerant cooled, squirrel cage, induction type suitable for voltage shown on the equipment schedule. 2. If an open drive motor is provided, a compres- sor shaft seal leakage containment system shall be provided: • An oil reservoir shall collect oil and refrigerant that leaks past the seal. • A float device shall be provided to open when the reservoir is full, directing the refrigerant/ oil mixture back into the compressor housing. • A refrigerant sensor shall be located next to the open drive seal to detect leaks. 3. Motors shall be suitable for operation in a refrigerant atmosphere and shall be cooled by atomized refrigerant in contact with the motor windings. 4. Motor stator shall be arranged for service or removal with only minor compressor disassem- bly and without removing main refrigerant pip- ing connections. 5. Full load operation of the motor shall not exceed nameplate rating. 6. One motor winding temperature sensor (and one spare) shall be provided. 7. Should the mechanical contractor choose to provide a chiller with an open motor instead of the specified semi-hermetic motor, the contrac- tor shall install additional cooling equipment to dissipate the motor heat as per the following formula: Btuh = (FLkW motor) (0.05) (3413) Btuh = (FLkW motor) (171) and, alternately Tons = Btuh / 12,000 The additional piping, valves, air-handling equipment, insulation, wiring, switchgear changes, ductwork, and coordination with other trades shall be the responsibility of the mechan- ical contractor. Shop drawings reflecting any changes to the design shall be included in the submittal, and incorporated into the final as-built drawings for the project. 8. Also, if an open motor is provided, a mechani- cal room thermostat shall be provided and set at 104 F (40 C). If this temperature is exceeded, the chillers shall shut down and an alarm signal shall be generated to the central Energy Management System (EMS) display module prompting the service personnel to diagnose and repair the cause of the over tem- perature condition. The mechanical contractor shall be responsible for all changes to the design, including coordination with temperature control, electrical and other trades. In addition, the electrical power consumption of any auxil- iary ventilation and/or mechanical cooling required to maintain the mechanical room con- ditions stated above shall be considered in the determination of conformance to the scheduled chiller energy efficiency requirement. D. Cooler and Condenser: 1. Cooler shall be of shell and tube type construc- tion, each in separate shells. Units shall be fabricated with high-performance tubing, mini- mum 1⁄4 inch steel shell and tube sheets with fabricated steel waterboxes. a. Waterbox shall be Nozzle-in-Head Waterbox (150 psig). 34PDF Image | Carrier Product Data 19XR,XRV High-Efficiency Hermetic Centrifugal Liquid Chiller 50/60 Hz HFC-134a 19XR — 200 to 1500 Nominal Tons (703 to 5275 kW) 19XRV — 200 to 800 Nominal Tons (703 to 2813 kW)
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Carrier Product Data 19XR,XRV High-Efficiency Hermetic Centrifugal Liquid Chiller 50/60 Hz HFC-134a 19XR — 200 to 1500 Nominal Tons (703 to 5275 kW) 19XRV — 200 to 800 Nominal Tons (703 to 2813 kW)Original File Name Searched:
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