Case 6: Expansion Valve Stuck Open

Measured pressure
Low-pressure: Above 35.6 psi
(245 kPa, 2.50 kg/cm2)

High-pressure: 307-326 psi
(2,119-2,247 kPa, 21.6-22.9 kg/Sq.cm)

Condition
Insufficient cooling.




Step 1
1. Check whether there is frost or heavy dew on suction pipe (between cooling unit and compressor).
2. If neither is found, refer to "Case 2: Excessive refrigerant or Insufficient Condenser Cooling'.
3. If either is found, replace expansion valve.