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Guide specifications (cont) g. Schedule Function: The chiller controls shall be configurable for manual or automatic start-up and shutdown. In automatic operation mode, the controls shall be capable of automatically starting and stopping the chiller according to a stored user programmable occupancy schedule. The controls shall include built-in provisions for accepting: 1) A minimum of two 365-day occupancy schedules. 2) Minimum of 8 separate occupied/ unoccupied periods per day 3) Daylight savings start/end 4) 18 user-defined holidays 5) Means of configuring an occupancy timed override 6) Chillerstart-upandshutdownviaremote contact closure h. Service Function: The controls shall provide a password pro- tected service function which allows autho- rized individuals to view an alarm history file which shall contain the last 25 alarm/alert messages with time and date stamp. These messages shall be displayed in text form, not codes. i. Network Window Function: Each chiller control panel shall be capable of viewing multiple point values and statuses from other like controls connected on a common network, including controller main- tenance data. The operator shall be able to alter the remote controller’s set points or time schedule and to force point values or statuses for those points that are operator forcible. The control panel shall also have access to the alarm history file of all like con- trollers connected on the network. j. Pump Control: Upon request to start the compressor, the control system shall start the chilled water pump, condenser water pumps and verify that flows have been established. k. Ramp Loading: A user-configurable ramp loading rate, effec- tive during the chilled water temperature pulldown period, shall control the rate of guide vane opening to prevent a rapid increase in compressor power consumption. The controls shall allow configuration of the ramp loading rate in either degrees/minute of chilled water temperature pulldown or percent motor amps/minute. During the ramp loading period, a message shall be dis- played informing the operator that the chiller is operating in ramp loading mode. l. Chilled Water Reset: The control center shall allow reset of the chilled water temperature set point based on any one of the following criteria: 1) Chilled water reset based on an external 4 to 20 mA signal. 2) Chilled water reset based on a remote temperature sensor (such as outdoor air). 3) Chilled water reset based on water tem- perature rise across the evaporator. m. Demand Limit: The control center shall limit amp draw of the compressor to the rated load amps or to a lower value based on one of the following criteria: 1) Demand limit based on a user input ranging from 40% to 100% of compres- sor rated load amps 2) Demand limit based on external 4 to 20 mA signal. n. Controlled Compressor Shutdown: The controls shall be capable of being con- figured to soft stop the compressor. When the stop button is pressed or remote con- tacts open with this feature active, the guide vanes shall close to a configured amperage level and the machine shall then shut down. The display shall indicate “shutdown in progress” 2. Safeties: a. Unit shall automatically shut down when any of the following conditions occur: (Each of these protective limits shall require manual reset and cause an alarm message to be dis- played on the control panel screen, inform- ing the operator of the shutdown cause.) 1) motor overcurrent 2) over voltage* 3) under voltage* 4) single cycle dropout* 5) bearing oil high temperature 6) low evaporator refrigerant temperature 7) high condenser pressure 8) high motor temperature 9) high compressor discharge temperature 10) low oil pressure 11) prolonged surge 12) loss of cooler water flow 13) loss of condenser water flow 14) starter fault *Shall not require manual reset or cause an alarm if auto-restart after power failure is enabled. 36PDF 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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