OPERATION 3.5 OPERATING THE HEATER, VENTILATION AND AIR CONDITIONING 3.5.2 B - COOLING CONDITIONING" in part 3 of this file. G 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. 183 2. Rotate the air conditioner control knob (6) to the desired t perature level. em- in- or- b at hly ed.
- or NOTICE When the air-conditioning is in operation the door and w dows should be closed to ensure maximum cooling perf mance. CAUTION 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 kno (6) and run blower (4) with high speed. After de-icing of the evaporator operate the air conditioner medium cooling output. NOTICE G If the Shovel has been exposed to the sun for a long period it is recommended to ventilate the cab thoroug by opening doors or windows until the hot air is expell G 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 compress and / or system due to loss of refrigerant.