Trane CVHH CenTraVac Installation, Operation And Maintenance Manual page 88

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
shall be energized to cool the oil.
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
Figure 53. 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: If the Oil Tank Temperature rises above the Oil Cooler Control Setpoint whilte the
compressor is running, the Oil Cooler Solenoid Valve shall be energized to cool the unit.
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continue to run for 3 minutes post-lube while the
compressor coasts to a stop. The oil vent line valve
will then open. 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.
the following figure (satisfied setpoint) illustrates this
sequence.
Limit Mode
Chiller Is Running—Limit
Modulate IGV/AFD
for Limit control
Exit
Limit Mode
Chiller Is Running
Modulate IGV/AFD
for LWT control
CVHH-SVX001G-EN
Chiller
Is
Running