LiuGong CLG835H, Service Manual

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Fault Diagnosis and Judgment
January 24, 2017
Overhauling method CLG835H
1. Touch compressor air intake hose
joint (thick joint) by hand to feel no
coldness.
2. There are no big differences in tem-
perature of the high temperature
zone and the low temperature zone
of a condenser.
3. The temperature of each part of res-
ervoir is basically the same to that of
condenser outlet and close to ambi-
ent temperature.
4. There is obvious temperature differ-
ence at both ends of the blocked
part.
Line between sight glass
outlet and compressor air
intake port is blocked or
crushed by foreign matter Remove blocked pipelines,
blow out foreign matters or
release the one being
pressed to flat; If gray black
or brown black color appears
in sight glass, please make
sure to replace reservoir.
1. Touch compressor air intake hose
joint (thick joint) by hand to feel no
coldness.
2. There are no big differences in tem-
perature of the high temperature
zone and the low temperature zone
of a condenser.
3. There is obvious temperature differ-
ence at both ends of the blocked
part.
4. Bubble visible in sight glass.
Line between condenser
outlet and sight glass
inlet is blocked by for-
eign matter
1. Touch compressor air intake hose
joint (thick joint) by hand to feel no
coldness.
2. There are no big differences in tem-
perature of the high temperature
zone and the low temperature zone
of a condenser.
3. Bubble visible in sight glass.
4. The bottom of the reservoir is cold
and even has condensing dew.
Filter of reservoir is
blocked by dirt Replace the refrigerant res-
ervoir
Pressure of low pressure
sid
e and hi
gh
pre
ssu
re
si
de are both hi
gh
5. Bubble visible in sight glass.
6. Touch compressor air intake hose
joint (thick joint) by hand to feel no
coldness.
7. The upper end and lower end of res-
ervoir do not have temperature differ-
ence, and temperature is higher than
or equal to ambient temperature.
Less refrigerant
Detect leakage, repair and
add refrigerant
1. Observe sight glass in the case of
compressor operation, and no air
bubble in sight glass within 5~10 sec-
onds after refrigeration is switched
off.
2. Temperature in the condenser nor-
mal temperature zone almost has no
difference with ambient temperature.
3. The condenser high temperature
zone is hotter than normal situation.
Redundant refrigerant
Release or recycle some
refrigerant
1. Observe air bubbles in sight glass in
the case of compressor operation.
2. The pointer of high pressure gauge
vibrates sharply and frequently.
The cooling system has
non-condensing gas such
as air
Release refrigerant, vacuum
pumping, and fill refrigerant
once again as specified in
Removal and Installation of
A/C Components
Items Fault conditions Cause
Troubleshooting meth-
ods