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2) Output power devices shall be Insulated Gate Bipolar Transistors IGBTs). 3) Converter section with full-wave fixed diode bridge rectifier shall convert incoming fixed voltage/frequency to fixed DC voltage. 4) DC Link shall filter and smooth the con- verted DC Voltage. 5) Transistorized inverter and control regu- lator shall convert fixed DC voltage to a sinusoidal PWM wave form. 6) Integrated controls shall coordinate motor speed and guide vane position to optimize chiller performance over a wide variety of operating conditions. 7) Surge prevention and surge protection algorithms shall take action to prevent surge and move chiller operation away from surge. b. Enclosure: 1) Pre-painted unit mounted, NEMA 1 cab- inet shall include hinged, lockable doors and removable lifting lugs. 2) VFD shall have a short circuit interrupt and withstand rating of at least 100,000 amps. 3) Provisions to padlock main disconnect handle in the “Off” positions shall be provided. Mechanical interlock to pre- vent opening cabinet door with discon- nect in the “On” position or moving disconnect to the “ON” position while the door is open shall be provided. 4) Provisions shall be made for top entry of incoming line power cables. c. Heat Sink: 1) The heat sink shall be refrigerant cooled. Heat sink and mating flanges shall be suitable for ASME design work- ing pressure of 185 psig. 2) Refrigerant cooling shall be metered by standard TXV controls to maintain heat sink temperature within acceptable lim- its for ambient temperature. d. VFD Rating: 1) Drive shall be suitable for nameplate voltage ±10%. 2) Drive shall be suitable for continuous operation at 100% of nameplate amps and 150% of nameplate amps for 5 seconds. 3) Drive shall comply with applicable ANSI, NEMA, UL and NEC standards. 4) Drive shall be suitable for operation in ambient temperatures between 40 and 104 F, 95% humidity (non-condensing) for altitudes up to 6000 feet above sea level. Specific drive performance at job- site ambient temperature and elevation shall be provided by the manufacturer in the bid. e. User Interface: Displays shall provide interface for program- ming and display of VFD and Chiller param- eters. Viewable parameters include: 1) Operating, configuration and fault messages 2) Frequency in Hertz 3) Load and line side voltage and current (at the VFD) 4) kW f. VFD Performance: 1) VFD full load efficiency shall meet or exceed 97% at 100% VFD Rated Ampacity. 2) Displacement Input Power Factor shall meet or exceed 95% Soft start, linear acceleration, coast to stop. 3) Base motor frequency shall be either 50 or 60 hertz. Adjustable frequency range from 38 to 60 hertz or 32.5 to 50 hertz. g. VFD Electrical Service: (single point power): 1) VFD shall have input circuit breaker with minimum 100,000 amp interrupt capacity. 2) VFD shall have standard 15 amp branch oil pump circuit breaker to provide power for chiller oil pump. 3) VFD shall have standard 3 KVA control power transformer with circuit breaker provides power for oil heater, VFD con- trols and chiller controls. 4) The branch oil pump circuit breaker and control power transformer shall be fac- tory wired. 5) Input power shall be 380/480 vac, ±10 percent, 3 Phase, 50/60 Hz, ±2% Hz. h. Discrete Outputs: 115v discrete contact outputs shall be pro- vided for: 1) Circuit breaker shunt trip 2) Chilled water pump 3) Condenser water pump 4) Alarm status. i. Analog Output: An analog (4 to 20 mA) output for head pressure reference shall be provided. This signal shall be suitable to control a 2-way or 3-way water regulating valve in the con- denser piping. 41PDF 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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