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Page Title: Table 5-3. Normal Operating Pressures (In Full Cooling Mode)
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ARMY TM 9-4120-381-14 NAVY EE-000-CA-MMA-010/7053-AC AIR FORCE TO 35E9-136-31 5-18. REFRIGERANT PRESSURE CHECK-Continued. SERVICE-Continued g. Open manual service valve (para 5-39). h. Adjust cool control thermostat (para 4-87) to lowest temperature setting. i. Connect air conditioner input power at source. j. Turn MODE SELECT SWITCH to COOL mode. k. With unit operating, allow gauges to stabilize.  Take readings of the two gauges. (1) If discharge and suction pressures are at, or near, same value, a pressure equalizer solenoid valve malfunction or an internal compressor failure is indicated. (2) If  discharge  pressure  is  low  and  suction  pressure  is  normal,  (refer  to  Table  5-3),  a  low  refrigerant  charge  is indicated. (3) If  discharge  pressure  is  normal  and  suction  pressure  is  either  high  or  low,  failure  or  maladjustment  of  the pressure regulator valve or expansion valve is indicated. (4) If  discharge  pressure  is  high  and  suction  pressure  is  normal,  a  malfunction  of  the  condenser  fan,  refrigerant overcharge, or clogged filter drier is indicated. I. When pressure tests are completed, proceed with maintenance action indicated. m. Turn mode switch to OFF. n. Disconnect air conditioner input power at source. o. Remove jumper wires installed in step f. FOLLOW ON PROCEDURE 1. Reset cool control thermostat (para 4-87). 2. Close left electric plate (para 4-30). 3. Remove service manifold hoses from service valves. 4. Install protective caps (para 5-11) to high and low pressure service valve stems. 5. Connect air conditioner input power at source. Table 5-3. Normal Operating Pressures (In Full Cooling Mode) 5-36

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