Case 5: No Refrigerant Circulation
Measurement pressureLow-pressure: Below 20 psi
(137 kPa, 1.40 kg/Sq.cm)
High-pressure: Below 88 psi
(608 kPa, 6.20 kg/Sq.cm)
Condition
Refrigerant flow obstructed by moisture or dirt, causing freezing or blockage of expansion valve.
Step 1
1. Turn air conditioner OFF for about 10 minutes. Turn air conditioner ON to determine whether blockage is due to moisture or dirt.
a. If caused by moisture: System will operate normally after being OFF for 10 minutes. (Ice melts and relieves blockage.)
b. If caused by dirt: System remains abnormal after being OFF 10 minutes. Go to Step 2.
Step 2
1. Remove expansion valve.
2. Blow out dirt with compressed air.
3. If unable to remove dirt, replace expansion valve.
4. Evacuate, charge, and test system. Refer to operating instructions of your refrigerant recovery/recycling/charging station for proper procedures.