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DIAGNOSIS OF Ale SYSTEM
CONDITION
1
REFRIGERANT
SLIGHTLY LOW
LOW sloe LOW
LOW SIDE
HAND
VALVE
CLOSED
LOW SIDE HOSE
CONNECTED
TO
LOW sIDe SERVICE
CONNECTOR
AMBIENT:
TEMP: 95° F.
HIGH sIDe LOW
HIGH
SIDE HOSE
CONNECTED
TO
HIGH
SIDE SERVICE
CONNECTOR
:1
Complaint
Little or no cooling.
Condition
1.
Low side gauge reading too low. Should be
15-30 psi.
2.
High side gauge reading too low. Should be
185-205 psi ambient temperature of 95°F. See
Chart
for
pressures
at
other
ambient
temperatures.
3.
Stream of bubbles visible in sight glass.
4.
Discharge air from evaporator
only slightly
cool.
Diagnosis
System low on refrigerant.
May be caused by
small leak.
Correction
1.
Leak test system.
2.
Discharge refrigerant from system if necessary
to replace units or lines.
3.
Repair leaks.
4.
Check compressor oil level. System may have
lost oil due to leakage.
5.
Evacuate system using vacuum pump.
6.
Charge system with NEW Refrigerant-12.
7.
Operate system and check performance.
N4·4
I
I
,
J
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Troubleshooting
