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Page Title:
TABLE 4-1.2. Pressure, Discharge and Suction Troubleshooting |
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 TM 5-4120-366-14
TABLE 4-1.2. Pressure, Discharge and Suction Troubleshooting
SUCTION
DISCHARGE
1. Check for high return air tempera-
1. Ensure condenser coil is not dirty or
HIGH
ture.
partially blocked.
2. Ensure equalizing solenoid valve is
2. Check for loose or missing lower front
open.
panel connector cover plate, circuit
breaker access cover, or filter mounting
3. Ensure compressor is running.
plate.
4. Check for expansion valve bulb
3. Check for excessive recirculation of
damage or poor contact with suction line.
hot condenser discharge air back into
condenser intake.
5. Test compressor.
4. Check for overcharge of refrigerant.
6. Test quench valve.
5. Check for air in refrigerant system.
7. Check for defective regulating valve.
6. Ensure fan motor is operating.
8. Test expansion valve.
7. Ensure condenser fan is not loose on
shaft.
8., Check for too much oil in refrigerant
system.
9. Check for high suction pressure.
1. Ensure return air filter is clean.
LOW
1. Check for low outside air tempera-
ture.
2. Check for partially blocked discharge
or return air ducts or openings.
2. Check for low refrigerant charge.
3. Ensure evaporator coil is clean.
3. Ensure compressor is operating,
4. Check for low return air tempera-
4. Test equalizing solenoid valve.
ture.
5. Check for defective pressure regulat-
5. Ensure refrigerant is fully charged.
ing valve.
6. Ensure liquid solenoid valve is
6. Test compressor.
closed.
7. Ensure fan motor is operating.
8. Check for loose evaporator fan.
9. Test expansion valve.
10. Check for excessive expansion valve
superheat.
4-22.2 Change 3
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