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TM 9-4120-367-14
TM 07592B-14/1
6.1 PRESSURE TEST. - Continued
Table 6-3. Low Head Pressure
Possible Cause
Remedy
1. Low refrigerant charge.
1. Completely charge, then leak test, repair, and
recharge to 5.5 Ibs (2.5 kg).
2. Restriction in liquid line.
2. Locate and repair.
3. Charging valve leaking.
3. Replace.
4. Fan thermostat defective.
4. Replace.
5. Actuating cylinder defective.
5. Replace.
Table 6-4. Low Suction Pressure
Possible Cause
1. Low refrigerant charge.
2. Restriction in expansion valve.
3. Low evaporator airflow.
4. Outdoor ambient at or near 0°F (-18°C).
Remedy
1. Completely charge, then leak test, repair and
recharge to 5.5 Ibs (2.5 kg).
2. Repair or replace.
3. Restriction, dirty filter, dirty mist eliminator, mo-
tor or blower.
4. It will be necessary to jumper LPCO to operate
at this outdoor temperature.
6-5
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