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SECTION 2 - OPERATION
2-30
2. Rotate the temperature control knob, 1,
counterclockwise (toward the red) to increase
the temperature and clockwise (toward the
blue) to decrease the temperature.
3. There are four positions on the pressurizer
fan switch, 2. The full counterclockwise
position is off. Each detent in the clockwise
direction increases the speed of the fan. The
fan speeds are low, high, and purge.
4. The recirculation knob, 3, controls the mix
between external air and recirculated cab air.
To increase the amount of fresh air entering
the cab, rotate the knob counterclockwise.
Rotate the knob clockwise to recirculate the
cab air. Do not block the recirculation vent, 4,
when recirculating cab air.
NOTE: The left-hand side of the cab roof
has a second recirculation vent that has a
fixed opening and is not adjustable.
5. To dehumidify the cab air during cold weather,
use the heater in conjunction with the air-
conditioning system to reduce air humidity.
Turn the air conditioner on and turn the
recirculation knob clockwise to recirculate the
cab air. Place the temperature control knob to
the desired heat level.
Air Conditioning
1. The air conditioning is activated by a two-
position rocker switch, 1. An indicator light on
the switch will glow when the air conditioning
is activated.
NOTE: The air-conditioning system uses
R134A refrigerant. DO NOT mix with other
refrigerants. DO NOT attempt to top off the
system with any other refrigerants. Rely
on a qualified technician for all air
conditioning repairs.
2. Rotate the temperature control knob, 2,
counterclockwise (toward the red) to increase
the temperature and clockwise (toward the
blue) to decrease the temperature.
3. There are four positions on the pressurizer
fan switch, 3. The full counterclockwise
position is off. Each detent in the clockwise
direction increases the speed of the fan. The
fan speeds are low, high, and purge.
Figure 2-42
2 3
4
1
Figure 2-43
31
2
4