32 AGZ 030A through 065A IOM 686
7. There will be a delay of 2 minutes after closing S1. The time delay is due to the compressor
inherent motor protection. This may allow more than one compressor to start after this time
period. This should only occur on initial start-up or when power to the chiller has been turned off
and back on. The panel Alarm Light will turn off.
8. After the chiller has been operating for a period of time and has become stable, check the
following:
§ Compressor oil level. (Some Scroll compressors do not have oil sight glasses)
§ Refrigerant sight glass for flashing.
§ Rotation of condenser fans.
9. Complete the “Compressorized Equipment Warranty Form”.
Shutdown
Temporary
1. Put both circuit switches to Pumpdown and Stop.
2. After compressors have stopped, put System Switch (S1) to Emergency Stop.
3. Turn off chilled water pump. Chilled water pump to operate while compressors are pumping
down.
To start the chiller after a temporary shutdown follow the start up instructions.
Extended
1. Front seat both condenser liquid line service valves.
2. Put both circuit switches in Pumpdown and Stop position.
3. After the compressors have stopped, put System Switch (S1) in Emergency Stop position.
4. Front seat both refrigerant circuit discharge valves.
5. If chilled water system is not drained, maintain power to the evaporator heater to prevent freezing.
Maintain heat tracing on the chilled water lines.
6. Drain evaporator and water piping to prevent freezing.
7. If electrical power is on to unit, the compressor crankcase heaters will keep the liquid refrigerant
out of the compressor oil. This will minimize start up time when putting the unit back into
service. The evaporator heater will be able to function.
8. If electrical power is off, make provisions to power the evaporator heater (if chilled water system
is not drained). Tag all opened electrical disconnect switches to warm against startup before the
refrigerant valves are in the correct operating position. When starting the unit, electrical power
must be on for 24 hours before starting the chiller.
To start the chiller after an extended shutdown, follow the pre startup and startup instructions.
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