Table 11-5.--Troubleshooting the A/M32C-17--Continued
INDICATION
PROBABLE CAUSE
SUGGESTED REMEDY
1. Check for infiltration of outside
C. Compressor runs
1. Excessive load. Infiltration
air into conditioned area. Check
continuously
of warm air. Insulation of
insulation.
conditioned area.
2. Reset or replace thermostat.
2. Thermostat set too low
3. Repair leak and charge system.
3. Lack of refrigerant--
bubbles in sight glass
4. Remove excess refrigerant.
4. Overcharge of refrigerant--
5. Overhaul compressor.
high discharge pressure
6. Repair or replace valve.
5. Leaky compressor valve--
compressor noisy or
abnormal suction and
discharge pressure
6. Solenoid valve stuck open
D. Compressor loses oil
1. Oil level too low
1. Add sufficient oil.
2. Clogged strainers or valves
2. Clean and repair or replace.
3. Loose expansion valve
3. Establish good contact between
remote bulb--excessively
remote bulb and suction line.
cold suction
4. Repair oil leak and add sufficient
4. Crankcase fittings leak
oil.
1. Tighten coupling and check align-
E. Noisy compressor
1. Loose drive coupling
ment.
operation
2. Lack of oil--compressor
2. Add oil.
cuts out on oil failure control
3. Dry or scored seal--squeak 3.
Check oil level.
or squeal when compressor
4.
Overhaul compressor.
runs
5.
Repair or replace.
4. Internal parts damaged--
6.
Tighten hold-down bolts. Check
compressor knocks
alignment.
5. Expansion valve stuck open
6. Compressor or clutch loose
on base
1. Add refrigerant.
F. System short of capacity
1. Flash gas in liquid line--
expansion valve hisses
2. Clean or replace.
2. Clogged strainer or solenoid
3.
Clean or defrost coils.
stop valve
4.
Repair or replace valve.
3. Ice or dirt on evaporator coils
5.
Check superheat and reset
4. Expansion valve stuck or
thermostatic expansion valves.
obstructed
5. Excess pressure drop in
evaporator--super heat too
high
11-34
