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 TM 55-1905-219-14-8
4-28. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
(a) Check oil level in compressor crankcase. The level should be at the center of the bull's-eye
sight glass. If necessary, add Carrier No. PP36-1 oil. Check compressor motor lubrication.
(b)
Open any stop valves in refrigerant, oil and sea water lines to pressure gauges and control
switches.
(c)
Line up condenser sea water circulating system:
1
Open condenser water regulator cut-out valves, water regulator bypass valve, water regulator
actuating line valve, and condenser water inlet valve.
2
Close condenser water vents and drains.
3
Open sea water circulating pump suction and discharge valves, water pump gauge line valve
at the pump, and any other valves in pump discharge line.
NOTE
On systems having sea water circulating pumps, water supply from firemain
should be obtained in case of emergency, or when ship is beached, by opening
condenser water supply valve from firemain.
4
Open any valves in condenser overboard discharge line.
(d)
Line up refrigerant system valves:
1
Open compressor discharge stop valve, condenser inlet and outlet valves, condenser-receiver
equalizing line valve, and heat interchanger liquid inlet valve.
2
Close charging and drain valves, purge valve, and heat interchanger liquid bypass valve.
3
Open dryer bypass line valve.
4
Close dryer inlet and outlet valves.
5
Open thermal expansion and solenoid cut-out valves, thermal expansion valve equalizing line
valve and coil return (outlet) valves at the evaporator.
6
Close hand expansion valves at the evaporator.
7 Close hot gas defrosting supply valves at compressor and cooling coil. Close hot gas de-
frosting hand expansion valves.
4-835
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