92
AGZ 026B through 130B
IOMM AGZ-5
Shutdown
Temporary
1. Put both circuit switches to the OFF position (Pumpdown and Stop).
2. After compressors have stopped, put System Switch (S1) to OFF (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 to the OFF position (Pumpdown and Stop position).
3. After the compressors have stopped, put System Switch (S1) to the OFF position
(emergency stop).
4. Front seat both refrigerant circuit discharge valves (if applicable).
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 to the unit is on, 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 warn
against start-up before the refrigerant valves are in the correct operating position.
At start-up, electrical power must be on for 24 hours before starting the chiller.
To start the chiller after an extended shutdown, follow the prestart-up and start-up
instructions.
Water Piping Checkout
1. Check the pump operation and vent all air from the system.
2. Circulate evaporator water, checking for proper system pressure and evaporator
pressure drop. Compare the pressure drop to the evaporator water pressure drop
curve.
3. Clean all water strainers before placing the chiller into service.
Refrigerant Piping Checkout
1. Check all exposed brazed joints for evidence of leaks. Joints may have been
damaged during shipping or when the unit was installed.
2. Check that all refrigerant valves are either opened or closed as required for proper
operation of the chiller.
3. A thorough leak test must be done using an approved electronic leak detector.
Check all valve stem packing for leaks. Replace all refrigerant valve caps and
tighten.
4. Check all refrigerant lines to insure that they will not vibrate against each other or
against other chiller components and are properly supported.
5. Check all flare connections and all refrigerant threaded connectors.
6. Look for any signs of refrigerant leaks around the condenser coils and for damage
during shipping or installation.
Summary of Contents for AGZ026BS
Page 103: ...IOMM AGZ 5 AGZ 026B through 130B 103...
Page 104: ...104 AGZ 026B through 130B IOMM AGZ 5...
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