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 TM 55-1905-220-14-8
4-29. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
Temperature Control Switch Data
Manufacturer
Detroit Switch
Model
2504150RN
Range
250 to 90
F
(-3.90 to 32.20C)
Differential
20to 5
F
(-16.7to -15 )
C
Recommended Settings:
Close
80 (26.70C)
F
Open
78 (25.60C)
F
(20) Water Regulating Valve.
The water regulating valve automatically controls the sea water flow through the condenser to maintain a
relatively constant condensing pressure to temperature. The water regulating valve is actuated by the
refrigerant head pressure in the condenser and must be adjusted so as to maintain the required condensing
pressure and to shut off water flow when the compressor is stopped. The water regulating valve is usually
located in the condenser water outlet line and is provided with a bypass to permit servicing.
(21) Water Pressure Failure Control Switch.
The water pressure failure control switch (when provided) stops the compressor in the event that sea
water pressure to the condenser should fall below the operating minimum (5 psig (34.5 kPa)). The water
pressure failure switch will allow the compressor to start again when water pressure is restored to the minimum
level required at start up (15 psig (103.4 kPa)).
Water Pressure Failure Switch Data
Manufacturer
Detroit Switch
Model
223875CB3
Range
20" vac to 80 psig
(551.6 kPa)
Differential
9 to 15 psi
(62.1 to 103.4 kPa)
Recommended Settings:
Close
15 psi (103.4 kPa)
Open
5 psi (34.5 kPa)
4-850
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