CVHE-SVX02M-EN
73
Figure 51. Sequence of operation: power up to starting
Now that the compressor motor is running in the
“Delta” configuration, the inlet guide vanes will
modulate, opening and closing to the chiller load
variation by operation of the stepper vane motor
actuator to satisfy chilled water setpoint. The chiller
continues to run in its appropriate mode of operation:
Normal, Softload, Limit Mode, and so on (refer to
Figure 52, p. 74).
If the chilled water temperature drops below the chilled
water setpoint by an amount set as the differential to
stop setpoint, a normal chiller stop sequence is
initiated as follows:
1. The inlet guide vanes are driven closed (up to
50 seconds).
2. After the inlet guide vanes are closed, the stop relay
and the condenser water pump relays open to turn
off. The oil and refrigerant pump motor will
continue to run for 3 minutes post-lube while the
compressor coasts to a stop. The chilled water
pump will continue to run while the UC800
monitors leaving chilled water temperature,
preparing for the next compressor motor start
based on the differential to start setpoint.
Figure 53, p. 74 illustrates this sequence.
SSttaarrtt--uupp aanndd SShhuutt--ddoowwnn
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