operators_manual

distribution dial. When activated, the
indicator on the button illuminates. The
sleeper HVAC unit will function to the
settings of the sleeper control.
NOTE
On the Cab Control Unit, the sleeper
enable switch must be pressed to turn
ON power to the sleeper control unit.
In addition, if air conditioning is re-
quested in the sleeper, the air condi-
tioner switch on the cab control unit
will be turned ON and fan in the cab
heater and air conditioning unit will be
turn on low (if it was OFF) automatical-
ly.
NOTE
The sensor is located on the sleeper
HVAC control panel and measures the
sleeper air temperature at the panel.
There will be a time delay between
temperature control adjustment and
sleeper air temperature change. Also,
be careful of any heat source which
could affect the air temperature by the
sensor. Avoid hanging items (shirt,
jacket, hat, etc.) which could block the
airflow to the sensor.
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.
CONTROLS - Heating and Air Conditioning
Y53-6126-1A1 (01/21) 121
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