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 TM 55-1905-219-14-8
4-28. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
8
During pulldown, bypass suction pressure regulator. Open bypass valve and close cut-out
valves.
9
After pulldown, place suction pressure regulator on the line. Open cut-out valves and close
bypass valve.
10 Close suction pressure regulator test connection or gauge line valve.
(e) Start sea water circulating through condenser. Test for water flow by slightly opening drains at
bottom of condenser water heads. At short intervals, open vents atop condenser water heads to release all air
from water side and fill condenser tubes with water. When venting is completed (water will squirt from the
vents) close vents.
(f)
Start air circulating fans in fan rooms and compartments.
(g) Check electrical power supply to all solenoid valves. Power supply may be fan motor
controller, compressor motor controller, or separate source. Solenoids powered from compressor motor
controller will not be energized until compressor is started.
(h)
On initial start-up, charge refrigerant. Refer to paragraph 4-28e(5).
(i)
Open compressor suction stop valve approximately one full turn.
(j)
With compressor motor controller selector switch in AUTO position, push START button. If
motor controller is equipped with L.P. BYPASS button, momentarily push START button while holding in
L.P.BYPASS button continuously. When motor is running at full speed, release L.P. BYPASS button. Proceed
with step (k) immediately.
NOTE
On systems where the condenser water pump motor controller is interlocked with the
compressor motor controller, the pump will start first. As soon as sea water pressure
to the condenser has built up closing the water pressure failure switch contacts, the
compressor will also start. Vent condenser water side as per step (g).
(k) Continue to open compressor suction stop valve as suction pressure is reduced to normal (cut-
in pressure of low pressure control switch). Open suction valve slowly to prevent rapid pumping down of low
pressure side which could cause oil foaming with consequent pumping of oil from compressor crankcase.
4-836
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