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 TM 55-1905-220-14-8
4-29. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
(d) For adjustment procedures refer to paragraph 4-34.
High Pressure Control Switch Data
Manufacturer
Detroit Switch
Part No.
223876CB7
Range
60 to 350 psig
(412.7 to 2413.3 kPa)
Differential
24 to 90 psi
(165.5 to 620.5 kPa)
Recommended Settings:
Close Setting
125 psig (861.9 kPa)
Open Setting
175 psig (1206.6 kPa)
Low Pressure Control Switch Data
Manufacturer
Detroit Switch
Part No.
223875CB3
Range
20" vac to 80 psig
(551.6 kPa)
Differential
9 to 15 psi
(62.1 to 103.4 kPa)
Recommended Settings:
Close Setting
37 psig (255.1 kPa)
Open Setting
28 psig (193.1 kPa)
(14) Oil Pressure Safety Switch.
The oil pressure safety switch is a differential pressure control which measures net oil pressure
(difference between oil pump discharge pressure and crankcase pressure) and stops the compressor in the
event that: (a) compressor lubricating oil pressure should drop below a safe minimum during operation, i.e.,
less than 12 psi (82.7 kPa) above crankcase pressure; or (b) oil pressure should fail to build up to a satisfactory
minimum at start up, i.e., at least 18 psi (124.1 kPa) above crankcase pressure. The oil safety switch is
interlocked with a time delay mechanism to permit a short operating period (less than one minute) at start up
under low oil pressure to allow oil pressure to develop.
4-847
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