Trane CCRC 20, Installation, Operation And Maintenance Manual

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24 CXRC-SVX01J-EN
Startup and Shutdown
Startup
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When wired properly, the unit cycles condenser fans in
response to compressor interlock or the IntelliPak
controller output. The IntelliPak controller reads
saturated refrigerant temperatures and cycles the fans
appropriately. Refer to the section,
“Wiring
Diagrams,” p. 31 .
Normal Unit Shut Down
The unit can be stopped by opening the unit power
supply disconnect switch. However, normally the unit
operation stops due to interruption of the cooling
demand signal by the circuit cooling relays. The CCRC/
CIRC condensing unit should be shutdown by first
shutting down the indoor evaporative cooling unit. By
stopping the indoor unit, the request for condensing
has been terminated, thus stopping all condenser fans.
The disconnect switch on the CCRC/CIRC unit power
supply should then be opened. By not shutting down
the evaporator unit first before the condenser unit
results in a high-pressure situation and should be
avoided if possible.
Seasonal Shut Down
If the unit will be inoperative for an extended period,
lock out unit operation by disconnecting the
compressor interlock circuits and opening and locking
the main power disconnect switch.
If desired, large amounts of liquid refrigerant can be
isolated and stored in the condenser by closing the
liquid line service valves and operating the
compressors to pump the refrigerant into the
condenser and then valving off the hot gas line near
the condenser coil.
Seasonal Startup
1. Inspect the interior of the unit for debris.
2. Check control panel wiring connections for
corrosion and proper security. Check control panel
door for proper weather seal.
3. Inspect condenser fans. Blades must be secure on
fan shaft and rotate freely.
4. Inspect coil for obstructions and cleanliness. Clean
coil if required.
5. Inspect low ambient dampers. Damper blades must
be properly aligned, free from obstructions and
operate freely. You may have to disconnect
actuator linkage to inspect damper movement.
6. Close unit power supply disconnect switch.
7. Allow 24 hours of crankcase operation before
starting compressors. Crankcase heaters are
energized whenever the unit disconnect is closed
and the compressors are off.
The unit should now operate properly in response to
cooling demand at the system thermostat.