Tips For Optimal Air Conditioner Usage - Hitachi 120-3 class Operator's Manual

Hydraulic excavator
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TIPS FOR OPTIMAL AIR CONDITIONER USAGE

For Rapid Cooling
Temperature in the cab may rise over 80 °C (176 °F) when
the machine is exposed to sun light in the summer.
In this case, ventilate air in the cab first by opening the
windows for rapid cooling. After starting the engine, press
AUTO switch (9). Set temperature to "18.0" on LCD (7) us-
ing temperature control switch (11). Turn circulation mode
switch (12) ON.
When Windows Become Clouded
If the insides of the windows become clouded during rainy
weather or on humid days, operate the air conditioner to
aid in keeping the windows clear. When the atmosphere is
very damp, and if the air conditioner has run excessively, the
outside of the windows may become clouded. If this hap-
pens, turn off the air conditioner to adjust the temperature
in the cab.
Off-Season Air Conditioner Maintenance
To protect each part of the compressor from a lack of lubri-
cant, operate the air conditioner at least once a month for
several minutes with the engine running at a slow speed
during off-season. When the cab temperature is lower than
15 °C (59 °F), the air conditioner may not operate. If this hap-
pens, warm the cab using the heater first.
IMPORTANT:
Do not suddenly increase the engine
speed.
Refer to the item "Check Air Conditioner
Filter" in the Maintenance Section for
maintenance of the air conditioner filters.
Always clean the auto air conditioner
sensor for effective air conditioner per-
formance. Avoid placing any obstructions
around the sensor.
OPERATOR'S STATION
1-64
7
12
11
Air Conditioner Sensor
9
M178-01-081
M1J1-01-028

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