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TM 9-4120-389-14
5-18. PRESSURE REGULATING VALVE
Preliminary procedure: Remove top cover.
a.
Adjustment/Test
(1)
Valves are factory set to start opening when suction pressure decreases to 58 psig. Do not
adjust.
(2)
Perform a refrigeration pressure check on unit in accordance with para. 5-9. Leave the
service manifold attached.
NOTE
To test, ensure that unit is in bypass cycle.
(3)
Set temperature control thermostat knob fully WARMER (clockwise), start air conditioner in
COOL mode, and observe pressure gauges. Suction pressure should drop to a minimum 50-60 psig (13 deg.
F) shortly after compressor starts, and then remain constant.
(4)
If suction pressure remains below 50-60 psig replace pressure regulating valve.
Change 3 5-45
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