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Page Title:
Conditions That Can Cause High Discharge Pressure |
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 TM 10-4110-262-13&P
0028 00
3. HIGH SUCTION PRESSURE-FROSTED SUCTION LINE
Basic Problem:
High Pressure Internal Liquid Leak to Low Side
a. Poor expansion valve bulb contact with suction line.
4. HIGH SUCTION PRESSURE-UNFROSTED SUCTION LINE
Basic Problem:
High Pressure Internal Vapor Leak to Low Side
a. Compressor valve plates leak.
b. Compressor piston or cylinder wear.
c.
Hot gas defrost valve leaks to low side.
Conditions That Can Cause High Discharge Pressure
1. High ambient temperature.
2. Air or non-condensables in system.
3. Restricted airflow across condenser. Dirty condenser fins etc.
4. A restriction in the high-pressure line between the compressor and the receiver tank.
5. Overcharge of refrigerant.
6. Incorrect refrigerant.
7. Condenser fan failure.
Conditions That Can Cause Low Discharge Pressure
1. Low box temperature.
2. Cold ambient temperature.
3. Low refrigerant charge.
4. Low-side restriction.
5. Worn compressor.
6. Incorrect refrigerant.
0028 00-6
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