Komatsu D475A-5E0 Operation & Maintenance Manual page 136

OPERATION
EFFECTIVE USE OF AIR CONDITIONER
WHEN IT IS DESIRED TO COOL INSIDE OF CAB QUICKLY
If the machine is left in the sun in the middle of summer, the temperature inside the cab may become extremely high.
If this happens and it is desired to cool the cab quickly, first open all the doors and windows to remove all the hot
air, then turn the air conditioner on.
After starting the engine, press auto switch (5) and use temperature setting switch (3) to set the temperature to 18.0.
Run the engine at a slightly higher speed for 2 or 3 minutes, then close the doors and windows.
When the temperature inside the cab goes down, adjust to the desired temperature.
WHEN WINDOW IS MISTED
In the rainy season, when the humidity inside the cab is high, if the windows mist up, run the air conditioner to remove
the mist. When the outside air is extremely humid, if the temperature inside the cab is too low, the outside of the
glass may mist up. If this happens, adjust the set temperature or stop the air conditioner to adjust the temperature
inside the cab.
ACTION WHEN NOT USING AIR CONDITIONER
At times of the year when the air conditioner is not used, run the air conditioner for several minutes with the engine
at low speed once a month to maintain the lubricating oil film on all parts of the compressor. (Running in of air
conditioner)
In winter, when the temperature inside the cab is low, the air conditioner may not work. If this happens, use a heater
to raise the temperature inside the cab and run the air conditioner.
NOTICE
When running the air conditioner, always start with the engine running at low speed. Never start the air conditioner when the
engine is running at high speed. It will cause failure of the air conditioner.
If water gets into the control panel or sunlight sensor, it may lead to unexpected failure, be careful not to let water get on these
parts. In addition, never bring any open flame near these parts.
For the auto function of the air conditioner to work properly, always keep the sunlight sensor clean and do not leave anything
around the sunlight sensor that may interfere with its sensor function.
EXPLANATION OF COMPONENTS
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