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XI. REFRIGERATING UNIT REPAIRING PROCEDURE
STANDARD PROCEDURE
Diagnosing the trouble
Discharging the refrigerant
Removing the Compressor
Checking the compressor oil
A little discoloration
(light yellow)
Setting the compressor and the dryer
Vacuum pumping and pot the electric parts
Charging the refrigerant
Leakage test
Test Run
Pinch-off seal of charge pipes
Finish
Severe discoloration
(light brown)
Purging the pipe at
high-pressure side
Purging the pipe at
low-pressure side
Joining compressor
and accumulator assy'
IMPORTANT THINGS
Refer to the TROUBLESHOOTING
* For purging the pipe, use HFC-134a as liquid state.
* Never use HCFC-141b, HCFC-22 for purging.
* Do not keep the pipes open to air more than 30 minutes.
These process in total should be finished within
* Rubber caps should be removed just before
compressor is used. Never leave the compressor
without the caps and open to the air.
Be sure to connect the adaptor with vacuum
Charge cylinder should be exclusive - use for
This is to prevent different refrigerant
( CFC-12, HCFC-22, CFC-113, HFCFC-141b, R-
502) from mixing with HFC-134a.
-9-
30 minutes.
pump.
HFC-134a.
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