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Figure 59. Sequence of operation: running
Starter
Status Is
"Running"
Starting
Chiller Is Running
Compressor
Modulate IGV/AFD*
for LWT Control
Enforce All Running Mode Diagnostics
*Note: AFD applies to CVH only.
Figure 60. Sequence of operation: satisfied setpoint
Satisfied Setpoint
Running
Preparing Shutdown
Close IGV (0 to 50 seconds)
Command IGV Closed
Enforce All Running Mode Diagnostics
*Note: CVH: No oil pressure is less than 3 psid (20.7 kPaD)
CVG: No oil pressure is opened Oil Differential Pressure Switch
If the STOP key is pressed on the operator interface, the
chiller will follow the same stop sequence as described
earlier 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 (refer to the following figure
[normal shut-down to stopped and run inhibit]).
CDHF-SVX01N-EN
Limit Mode
Chiller Is Running—Limit
Modulate IGV/AFD*
for LWT Control
Shutting Down
Postlube
(CVH: 3 minutes)
(CVG: 1 minute)
De-Energize
Compressor
Confirm No Compressor Currents
Within 0 to 30 seconds
De-Energize Condenser
Water Pump Relay
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
sequence-closed and the compressor motor is
immediately turned off.
S S t t a a r r t t - - u u p p a a n n d d S S h h u u t t - - d d o o w w n n
Exit
Limit Mode
Chiller Is Running
Modulate IGV/AFD*
for LWT Control
Shutting Down
De-Energize Oil Pump
Confirm No Oil Pressure*
5 minutes After Oil Pump is De-Energized
Chiller
Is
Running
Auto
77
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