Trane CVHE Installation, Operation And Maintenance Manual page 62

Start-up and Shut-down
If the chilled water temperature drops below the chilled
water set point 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.
Figure 39. Sequence of operation: running
Figure 40. Sequence of operation: satisfied setpoint
If the STOP key is pressed on the operator interface, the
chiller will follow the same stop sequence as above except
the chilled water pump relay will also open and stop the
chilled water pump after the chilled water pump delay
timer has timed out after compressor shut down (see
Figure 41).
If the "Immediate Stop" is initiated, a panic stop occurs
which follows the same stop sequence as pressing the
STOP key once except the inlet guide vanes are not
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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 main processor module monitors leaving
chilled water temperature preparing for the next
compressor motor start based on the "differential to
start" setpoint.
Figure 40, p. 62 illustrates this sequence.
sequence closed and the compressor motor is
immediately turned off.
CVHE-SVX02H-EN