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OPERATION
HANDLE AIR CONDITIONER
NOTICE
•
To prevent putting any excessive load on the engine or compressor, use the air conditioner only
when the engine is running.
•
When running in 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, take care
not to let water get on these parts.
In addition, never bring any open flame near them.
•
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.
•
Where there is dust or bad smell in the using environment of the machine, use the RECIRC mode.
•
When turning the cooling on, if the temperature inside the cab is high, open the doors and windows to bring
in fresh air before using the air conditioner.
•
When performing inspection and maintenance of the machine equipped with the air conditioner, refer to the
tables in "METHOD FOR CHECKING AND MAINTENANCE AIR CONDITIONER (4-36)".
•
To allow the air conditioner to show its full performance, have inspection and maintenance performed peri-
odically. When adding refrigerant or performing other maintenance, special tools and instruments are nee-
ded, so ask your Komatsu distributor to perform inspection and maintenance.
•
When the air conditioner is not used every day, to prevent loss of the film of oil at various parts, run the air
conditioner with the engine at low speed from time to time and perform cooling or dry heating for several
minutes.
•
To prevent leakage of the refrigerant from the air conditioner cooling circuit, operate the air conditioner for
several minutes 2 or 3 times a month during the off-season. If the air conditioner is left for a long time when
the refrigerant is leaking, internal rust may occur, causing failure.
•
When the temperature inside the cab is low, the air conditioner may not work. In this case, circulate recircu-
lation air to warm the inside of the cab. After that, turn the air conditioner switch ON, the air conditioner will
work.
•
If any abnormality is detected in any equipment or sensor used on the air conditioner, the air conditioner
system caution lamp lights up on the monitor screen. If the air conditioner system caution lamp lights up,
ask your Komatsu distributor for inspection and repair.
Ventilation
•
When running the air conditioner for a long time, turn the lever to FRESH position once an hour to perform
ventilation and cooling.
•
If you smoke when the air conditioner is on, the smoke may hurt your eyes. In such case, open the window
and turn the lever to FRESH for a while for ventilation and cooling to drive smoke out.
Temperature control
For reasons of health, the optimum setting for cooling is considered to be when it feels slightly cool (5 to 6 °C
lower than the ambient temperature) when you enter the cab.
Be careful to select the appropriate temperature.
HANDLE AIR CONDITIONER
3-211
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