Page text (OCR transcript)
AIR CONDITIONING SYSTEM — Troubleshooting
3. INSUFFICIENT REFRIGERANT
Condition: Insufficient cooling
Symptom seen in
refrigeration system | Probable cause | Diagnosis | Remedy
Pressure low at both low
and high pressure sides
Bubbles seen in sight
glass
Insufficient cooling
performance | Gas leakage at some place
in refrigeration system | Insufficient refrigerant in
system
or
Refrigerant leaking | Check with leak tester and
repair
or
Charge refrigerant to proper
amount
4. POOR CIRCULATION OF REFRIGERANT
Condition: Insufficient cooling
Symptom seen in
refrigeration system | Probable cause | Diagnosis | Remedy
Pressure low at both low
and high pressure sides
Frost on tubes from
receiver to unit | Refrigerant flow obstructed
by dirt in receiver | Receiver clogged | Replace receiver
