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OPERATION
3.5.2
B - COOLING
1. Set blower switch (4) to high stage.
2. Rotate the air conditioner control knob (6) to the desired tem-
perature level.
NOTICE
When the air-conditioning is in operation the door and win-
dows should be closed to ensure maximum cooling perfor-
mance.
On rainy days with high atmospheric humidity select high
fan speed to prevent ice build up at the evaporator.
If icing occurs, select low cooling output with control knob
(6) and run blower (4) with high speed.
After de-icing of the evaporator operate the air conditioner at
medium cooling output.
NOTICE
If the Shovel has been exposed to the sun for a long
period it is recommended to ventilate the cab thoroughly
by opening doors or windows until the hot air is expelled.
The air conditioner should be operated at least 30 min-
utes once a month. This operation will keep seals from
drying out, causing possible damage to the compressor
and / or system due to loss of refrigerant.
For more information, refer to the separate Manual "AIR
CONDITIONING" in part 3 of this file.
The blower switch (1) for cab pressurizing should be in
position "0". Otherwise too much hot air will be sucked
into the operator's cab.
3.5.3
COMBINED OPERATION OF AIR CONDITIONING AND HEATING
Mainly on wet and rainy days, if no or little heating is desired, it is
possible to dehumidify (to dry) the cabin air by using the air condi-
tioner and heater. To do this, select intermediate control positions.
3.5 OPERATING THE HEATER, VENTILATION AND AIR CONDITIONING
CAUTION
193
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