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b. Waterbox shall have standard Victaulic grooves. 2. Condenser shall be of shell and tube type con- struction, 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. Water box shall be Nozzle in Head (150 psig). b. Waterbox shall have standard Victaulic grooves. 3. Waterboxes shall have vents, drains, and covers to permit tube cleaning within the space shown on the drawings. A thermistor type temperature sensor with quick connects shall be factory installed in each water nozzle. 4. Tubes shall be individually replaceable from either end of the heat exchanger without affect- ing the strength and durability of the tube sheet and without causing leakage in adjacent tubes. 5. Tubing shall be copper, high-efficiency type, with integral internal and external enhance- ment unless otherwise noted. Tubes shall be nominal 3/4-in. OD with nominal wall thick- ness of 0.025 inches measured at the root of the fin at the enhanced areas and nominal wall thickness of 0.049 inches where the tubes are in contact with the end tube sheets unless oth- erwise noted. Tubes shall be rolled into tube sheets and shall be individually replaceable. Tube sheet holes shall be double grooved for joint structural integrity. 6. Cooler shall be designed to prevent liquid refrig- erant from entering the compressor. Devices that introduce pressure losses (such as mist eliminators) shall not be acceptable because they are subject to structural failures that can result in extensive compressor damage. 7. The condenser shell shall include a FLASC (Flash Subcooler) which cools the condensed liquid refrigerant to a reduced temperature, thereby increasing the refrigeration cycle efficiency. 8. A reseating type pressure relief valve shall be installed on each heat exchanger. If a non- reseating type is used, a backup reseating type shall be installed in series. E. Refrigerant Flow Control: To improve part load efficiency, liquid refrigerant shall be metered from the condenser to the cooler using a float-type metering valve to maintain the proper liquid level of refrigerant in the heat exchangers under both full and part load operating conditions. By maintaining a liquid seal at the flow valve, bypassed hot gas from the condenser to the cooler is eliminated. The float valve chamber shall have a bolted access cover to allow field inspection and the float valve shall be field serviceable. F. Controls, Safeties, and Diagnostics: 1. Controls: a. The chiller shall be provided with a factory installed and wired microprocessor control center. The control center shall include a 16 line by 40 character liquid crystal display, 4 function keys, stop button, and alarm light. The microprocessor can be configured for either English or SI units. b. All chiller and starter monitoring shall be dis- played at the chiller control panel. c. The controls shall make use of non-volatile memory. d. The chiller control system shall have the abil- ity to interface and communicate directly to the building control system. e. The default standard display screen shall simultaneously indicate the following mini- mum information: 1) date and time of day 2) 24 character primary system status message 3) 24 character secondary status message 4) chiller operating hours 5) entering chilled water temperature 6) leaving chilled water temperature 7) evaporator refrigerant temperature 8) entering condenser water temperature 9) leaving condenser water temperature 10) condenser refrigerant temperature 11) oil supply pressure 12) oil sump temperature 13) percent motor Rated Load Amps (RLA) f. In addition to the default screen, status screens shall be accessible to view the status of every point monitored by the control cen- ter including: 1) evaporator pressure 2) condenser pressure 3) bearing oil supply temperature 4) compressor discharge temperature 5) motor winding temperature 6) number of compressor starts 7) control point settings 8) discrete output status of various devices 9) compressor motor starter status 10) optional spare input channels 11) line current and voltage for each phase 12) frequency, kW, kWhr, demand kW 35PDF 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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