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TM5-4120-377-14
(e) Carefully pull junction box out far enough to gain access to button plug in end of pressure
regulating valve.
(f) Remove button plug from end of pressure regulating valve.
The following must be conducted with power on. Exercise extreme caution.
(g) Set TEMPerature control thermostat knob fully INCREASE (clockwise).
(h) Start air conditioner in COOL mode and allow suction pressure to stabilize.
(i) To adjust suction pressure, turn adjusting stem clockwise to raise (increase) pressure, or
counterclockwise to lower (decrease) pressure. If pressure is low (below 56 psi) and cannot be raised by
adjustment, pressure regulating valve must be replaced. If pressure is high (above 60 psi) and cannot be
lowered by adjustment, test operation of the quench valve (para 5-19) before replacing pressure regulating
valve.
(j) Turn unit OFF.
(k) If pressure regulating valve was properly adjusted:
(1) Reinstall button plug in end of pressure regulating valve.
Carefully slip junction box into place and aline mounting hardware.
Using screwdriver, tighten four captive panel fastener screws in junction box.
Insert bottom flange of lower front panel inside the lip of the cabinet base.
Push top of lower front panel into position.
Using screwdriver, secure lower front panel with two captive panel fastener screws.
Close service valves on unit.
Remove gages or service manifold from service valves.
Install service valve protective caps.
Using screwdriver, secure service valve cover with four screws and flat washers.
b. Removal
Preliminary procedure: Remove compressor. (See para 5-20.)
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