Komatsu PC200-8M0 Shop Manual page 1179

100 Air conditioner
Procedure for testing and troubleshooting
*1: By error display or abnormal display on "Electrical Systems" screen on the machine monitor.
*2: Simple checking of refrigerant volume through sight glass.
Start up the engine, set the air conditioner switch to ON, and then wait for five minutes before proceeding
with the inspection.
A) If the continuous stream of bubbles can be seen, the system contains insufficient refrigerant.
B) If the bubbles can be seen intermittently, the refrigerant volume is sufficient.
C) If no bubbles can be seen (i.e., the liquid is perfectly clear), the system contains too much refrigerant
or no refrigerant at all.
The above should be treated as general guidelines as certain exceptions do exist.
See "Troubleshooting with gauge pressure" and use gauge pressure to determine whether or not the
condition is normal.
S: Sight glass condition
R: Receiver drier internal condition
LR: Liquid refrigerant
*3: If any leakage of refrigerant is occurring, the compressor oil circulating within the air conditioner circuit will
definitely be leaking from the same point.
In such a case, retighten in accordance with the table of retightening torques from "Precautions for discon-
necting and connecting air conditioner piping."
*4: Start the engine and perform the check with the air conditioner switch set to ON.
PC200, 200LC, 220, 220LC-8M0
SEN06151-00
21
80-100