operators_manual

• Adjust the air temperature to
maximum cool by rotating the
temperature dial counterclockwise.
• Engage the air conditioner
compressor by pressing the air
conditioner button.
• Set the air source to recirculation
mode by pressing the outside air/
recirculation air button. The button
indicator light should be
illuminated.
For Maximum Heating
• Adjust the fan speed to high by
rotating the fan control dial
clockwise.
• Set the air distribution dial to the
floor setting.
• Adjust the air temperature to
maximum heat by rotating the
temperature dial clockwise.
NOTE
The engine must be at operating tem-
perature for maximum heating. If oper-
ating in AUTO mode, heating airflow is
not allowed until the engine warms
sufficiently to provide required coolant
temperatures.
Air Dehumidification
The air conditioner system can be used to
reduce the humidity level of the cab and
clear fog from the windshield.
• Adjust fan speed to the desired
airflow setting.
• Engage the air conditioner
compressor by pressing the air
conditioner button.
• Set the air source to outside air
mode by pressing the outside air/
recirculation air button. The button
indicator light should NOT be
illuminated.
NOTE
The A/C compressor may not engage
when the outside temperature is below
34ºF (1ºC).
Cab Air Distribution
Equal distribution of air is important in
maintaining a constant cab interior
temperature. For best performance, all
vents should remain open to allow AUTO
mode to function properly. To maintain the
selected cab temperature, AUTO mode
may provide an air temperature from the
vents that differs from the temperature set
point. To ensure proper operation, it is
recommended that the driver redirects the
air instead of adjusting the temperature set
point or closing the vent. The system may
have difficulties in obtaining the desired
cabin temperature if the temperature
setting is repeatedly changed.
The mode of air distribution inside the cab
is set using the air distribution dial. Five
icons on the dial indicate the primary mode
options. The driver may also select a
secondary mode in between the primary
modes indicated by points on the dial.
Airflow is provided to the side windows in
all modes.
Outside Air/Recirculation Air
Selecting air recirculation mode completely
isolates the cab interior from the outside
air. This mode is helpful in preventing dust,
pollen, and odors from entering the cab.
Additionally, recirculation mode can reduce
the amount of time needed to cool down
the vehicle while in maximum cool down.
Note that the mode may increase fogging
on the windshield. A coarse air filter is
CONTROLS - Heating and Air Conditioning
122 Y53-6126-1A1 (01/21)
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