Komatsu PC220LC -8 Operation & Maintenance Manual page 149

DETAILED CONTROLS AND GAUGES
Method of Operation
The air conditioner can be operated automatically or manually. Select the method of operation as desired.
Automatic Operation
1. Turn auto switch (5) ON.
The monitors for the set temperature (a) and air flow (b) are
also displayed.
2. Use temperature set switch (3) to set to the desired
temperature. The air flow, combination of vents, and selection
of fresh or recirculated air is automatically selected according
to the set temperature, and the air conditioner is operated
automatically to provide the set temperature.
REMARK
When vent display monitor (c) displays (d) or (e), and engine
coolant temperature is low, the air flow is automatically limited to
prevent cold air from blowing out.
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OPERATION