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 TM 55-1905-223-24-17
Table 2-2. Troubleshooting - CONT
Malfunction
Test or Inspection
Corrective Action
AIR CONDITIONING - CONT
STEP 3.
Check to see if condenser water inlet temperature is above 900F.
Make sure the water intake line is clear of hot water discharges or other external sources of
heat.
9.
Low operating head (discharge) pressure below normal.
STEP 1.
Check to see if water inlet temperature is too low.
Adjust water flow by adjusting the water regulating valve to 210 psig (discharge/head
pressure) (A/C-2). (Valve is automatically adjusted on self-contained units.)
STEP 2.
Check for excessive water flow through condenser.
Adjust the water regulating valve in seawater discharge line to 210 psig on A/C-2 by
loosening the locknut and turning the adjusting screw.
STEP 3.
Check to see if compressor suction stop valve is partially closed (A/C-2; accommodations).
Open valve fully counterclockwise.
10.
Higher than normal suction pressure.
STEP 1.
Check for over-feeding of refrigerant in expansion valve equipped unit (A/C-2).
Make sure thermal bulb on expansion valve is firmly secured to the refrigerant line.
11.
Compressor crank-case cold (sweating or frosting).
STEP 1.
Check to see if operating thermostat is set too low or is defective.
Adjust thermostat.
WARNING
Do not open crankcase until compressor has been isolated and refrigerant charge removed.
STEP 2.
Check for too much oil in system (A/C-2 only).
Remove excess oil. Adjust level to the half-way point in the observation window (sight
glass) on compressor (Item 5, Table 2-1).
STEP 3.
Check for expansion valve (on valve-equipped unit; A/C-2).
Check to see that the thermal bulb of the expansion valve is firmly attached in place.
2-22
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