TROUBLESHOOTING BY MANIFOLD GAUGE SET READINGS
PROBLEM: Insufficient Cooling
Indications:
Low side pressure - LOW.
High side pressure - LOW.
Discharge air is only slightly cool.
- Low refrigerant charge, causing pressures to be
slightly lower than normal.
Check for leaks by performing leak test.
After locating the source of the leak, recover the
Possible Causes
Suggested Corrective Actions
If No Leaks Are Found:
If Leaks Are Found:
PROBLEM: Little or No Cooling
Indications:
Low side pressure - VERY LOW
High side pressure - VERY LOW
Discharge air is warm.
No bubbles observed in sight glass, may show oil
streaks.
- Pressure sensing switch may have compressor
- Refrigerant excessively low; leak in system.
Add refrigerant (make sure system has at least
50% of its normal amount) and leak test system.
It may be necessary to use a jumper wire to
-
pressor has shut down due to faulty pressure
the system if necessary, Replace the receiver-drier
clutch disengaged.
Possible Causes
Suggested Corrective Actions
Recover the refrigerant and use a scale to
charge the proper amount into the system.
Check system performance.
refrigerant, and repair the leak. Evacuate the
system and recharge using a scale. Add oil as
necessary. Check AC operation and perform-
ance test the system.
enable the compressor to operate, if the com-
sensing switch. Repair any leaks and evacuate
if the system was opened. Recharge the system
using a scale and add oil as necessary. Check
AC operation and do system performance test.
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