CVHH-SVX001G-EN
89
Figure 54.
Sequence of operation: satisfied setpoint
Satisfied Setpoint
Preparing Shutdown
Shutting Down
Shutting Down
Running
Auto
Close IGV (0–50 sec)
Postlube 3 min
De-Energize Oil Pump
Command IGV Closed
De-Energize
Compressor
Open Oil Vent Line Valve
Confirm No Oil Pressure*
5 min after oil pump is de-energized
Confirm No Compressor Currents
Within 0–30 sec
Hold position of Oil Vent Line Valve
De-Energize Condenser
Water Pump Relay
Enforce All Running Mode Diagnostics
*Note: No oil pressure is less than 3 psid (20.7 kPaD)
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]).
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.
Summary of Contents for CVHH CenTraVac
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