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Page Title: Table 6-3. Low Head Pressure
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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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