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DIAGNOSIS OF Ale SYSTEM
CONDITION 7
LARGE AMOUNT OF AIR IN SYSTEM
LOW SIDE HIGH
lOW
SIDE
HAND
VALVE
CLOSED
LOW SIDE HOSE
CONNECTED
TO
lOW
SIDE SERVICE
CONNECTOR
AMBIENT
~TEMP. 95° F.
HIGH SIDE HIGH
HIGH
SIDE HOSE
CONNECTED
TO
HIGH
SIDE SERVICE
CONNECTOR
I
I
, j
Complaint
Little or no cooling
Condition
1.
Low side gauge reading too high. Should be
15-30 psi.
2.
High side gauge reading too high. Should be
185-205 psi at ambient temperature
of 95°F.
See chart for pressures at other
ambient
tem peratu res.
3.
Occasional bubbles evident in sight glass.
4.
Discharge air from evaporator
is not cool.
Diagnosis
Air
in system.
Refrigerant
contaminated
by
non-condensables (air and/or moisture).
Correction
1.
Discharge refrigerant
from system.
2.
Replace
Receiver-Drier
which
may
be
saturated with moisture.
3.
Evacuate system using vacuum pump.
4.
Charge system with NEW Refrigerant-12.
5.
Operate system and check performance.
N4-10
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Troubleshooting
