User Manual

Air Conditioner Operating Tips
CAUTION
During extreme cold weather, DO NOT
blow
hot defroster air onto cold wind-
shields. This could crack the glass.
Turn the Air Flow Control Dial to De-
frost and adjust the fan speed accord-
ingly while the engine warms. If the
engine is already warm, move the
Temperature Control Dial to "cool,"
then gradually increase the tempera-
ture when you see that the windshield
is starting to warm up. Failure to com-
ply may result in equipment damage.
Defrosting and Defogging the
Windshield
The cab windshield and side windows can
be cleared of ice and fog in two ways. The
first is to use the MAX defrost mode. The
second is to manually adjust the air
distribution dial to the defrost position.
The manual defrost/defogging mode differs
from the MAX defrost mode by allowing the
driver to select an air temperature other
than full heat. This allows the driver to
maintain a constant cab temperature while
defrosting the windshield. However, note
that performance may be reduced.
•
Adjust the fan speed to high by
rotating the fan control dial
clockwise.
• Set the air distribution dial to the
defrost mode setting. This
automatically engages the outside
air and the air conditioner
compressor.
• Adjust the temperature dial to add
heat as needed.
For maximum performance, adjust the
temperature to maximum heat by rotating
the temperature dial clockwise. The driver
may also use the floor/defrost setting on
the air control
For Maximum Cooling
• Adjust the fan speed to high by
rotating the fan control dial
clockwise.
• Set the air distribution dial to the
panel setting.
• 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.
CONTROLS - Heating and Air Conditioning
110 Y53-6113-1A1 (11/20)
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