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 TM 55-1905-223-24-17
Table 4-1. Troubleshooting - CONT
Malfunction
Test or Inspection
Corrective Action
AIR CONDITIONING
3.
High operating head (discharge) pressure (above 230 psig).
STEP 1.
Check to see if refrigerant is overcharged.
a.
Remove excess refrigerant:
A/C-2 (Accommodations unit).
(1)
Shut down compressor and connect a portable gauge manifold hook up as
follows:
(2)
Connect combination (suction) hoseline of the manifold to the suction service
valve on the compressor. Connect the high pressure (discharge) hoseline of
the manifold to the discharge valve on the compressor.
(3)
Connect the common (middle) hoseline of the manifold to an empty R-22
refrigerant container. Open the valve on the empty container.
(4)
Make sure both gauge port handwheels on the manifold are closed fully
clockwise. Start compressor and run while adjusting pressure. Open
discharge and suction service valves on compressor three turns clockwise.
Suction and discharge pressures will register on the gauge manifold.
(5)
Crack open the gauge port handwheel on the high pressure (discharge) gauge
on the manifold momentarily 2 to 3 seconds. Close handwheel and observe
discharge pressure readings. Pressure should be between 170 and 230 psig.
If not, repeat above procedure.
(6)
When discharge pressure adjusted to proper level, close valve on R-22
container. Close (back-seat) discharge and suction service valves fully
counterclockwise.
(7)
Disconnect portable gauge manifold from compressor service valves and from
R-22 container.
STEP 2.
Check to see if compressor discharge stop valve partially closed (A/C-2; accommodations).
Turn valve fully counterclockwise.
4.
Low operating head (discharge) pressure (below 170 psig).
STEP 1.
Check for leaky compressor discharge or suction valve plate.
4-4
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