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 TM 55-1905-220-14-8
4-29. AIR CONDITIONING SYSTEM - MAINTENANCE INSTRUCTIONS (Continued).
(8) Oil Pressure Safety Switch.
(a) The operation of the oil pressure safety switch should be checked periodically (at least once
a month) and whenever the compressor is put back in operation after it has cut-out on the oil safety switch.
Test operation of oil safety switch.
CAUTION
Do not bypass or manually control oil safety switch to operate
compressor if switch has cut-out. To protect compressor from
damage, find and correct cause of low oil pressure before
placing compressor back in operation. Possible causes of low
oil pressure are given in paragraph 4-29f(6) and
troubleshooting procedures in volume 3.
(9) Oil Pressure Gauges.
(a) The compressor is provided with: (1) and oil pressure gauge which indicates the oil pump
discharge pressure, and (2) a control oil pressure gauge which indicates the oil pressure metered to the
capacity control system. The oil pump pressure gauge is mounted either on the compressor or on a separate
gauge board. The control oil pressure gauge is mounted on the compressor.
(b) After the capacity control system has been adjusted, isolate the control oil pressure gauge by
closing the shut-off valve at the compressor. Leave the oil pump pressure gauge in operation, but crack the
shut-off valve so that the needle does not vibrate excessively.
4-879
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