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TM5-4120-377-14
5-24. PRESSURE REGULATING VALVE
a. Adjustment/Test
(1) Valves are factory set to start opening when suction pressure decreases to 58 psig. Do not adjust
unless you are sure adjustment is necessary.
(2) Perform a refrigeration pressure check on unit in accordance with paragraph 5-12. Leave the gages
or service manifold attached.
(3) Set TEMPerature control thermostat knob fully INCREASE (clockwise), start air conditioner in COOL
mode, and observe pressure gages. Suction pressure should drop to 58 ± 2 psi (4.0 ± 0.14 kg/cm2) shortly
after compressor starts, and then remain constant.
(4) If unit fails above test, the pressure regulating valve must be adjusted.
(a) Turn unit OFF.
Figure 5-24. Pressure Regulating Valve Access
(b) Using screwdriver, loosen two captive panel fastener screws in lower front panel.
(c) Tilt top of lower front panel out and lift panel up to remove.
(d) Using screwdriver, loosen four captive panel fastener screws in junction box mounting flange.
Take care that wire harnesses, capillary line, and circuit breaker reset linkage are not
damaged.
5-50
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