Bubbles or foam visible Trouble shoot
●No bubble shown
High-pressure pipe is hot
abnormally.
H-L pressure of the
pressure gauge needle
indicates high pressure
abnormally
●Too much of refrigerant deflate.
●High pressure pipe is not
abnormal
● H.L pressure of the pressure
gauge needle indicates high
abnormally.
Abnormal
● Refrigerant in the
sight is shown clearly
● When engine RPM
operates with high low
some bubbles disappear
slowly
● Normal refrigerant gas situation
● High pressure pipe is hot
Low pressure pipe is cool
● High low pressure is normal
with below.
Low: 1.5~2.0kg/㎡
High: 14.5~15kg/㎡
normal
12-13
5.Diagnosing malfunctions.
(1) Tracing faults
SYMPTOM CONDITION CAUSE REMEDY
1.Compressor Abnormal
sound
Inlet sound
Outlet sound
Insufficient Lub. Replenish
Belt tension release Adjust
Release the bracket Tighten the bolts
Clutch fail Check
Abnormal
revolution
Inlet cause Damaged parts Check,replace
Slip the clutch Check,replace
Not Lub. Replenish
Outlet cause Belt tension
released
Adjust
Refrigerant or
oil leakage
Refrigerant or oil
leakage
Sealing washer
damaged
replace
Head bolt released Tighten the bolts
D-ring damaged Replace
Excessive
pressure
Low,High pressure Insufficient
refrigerator
Adjust
Compressor Replace