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CONTROLS
GENERAL SYSTEM OPERATION
Heater Operation
The ATC automatically controls the Heater-
A/C to maintain the cab air temperature
close to the set point selected by the
temperature control pushbuttons. The ATC
will adjust the air temperature blown through
the ducts to maintain this temperature. If
more heat is desired, increase the set point
temperature by pushing the up temperature
button. If less heat is desired, decrease the
set point by pushing the down temperature
button.
To obtain maximum heating, set the set point
temperature to 32°C (90°F). The system will
put out maximum heat continuously, even if
the cab temperature exceeds the set point
temperature. Turn the blower fan speed to
maximum fan (not AUTO).
In AUTO mode, the fan speed will increase
as necessary to warm up the cab to the set
point temperature. Once the cab reaches the
set point temperature, the fan speed will
decrease.
Finer temperature control can be obtained by
leaving the control panel in °F units. The
temperature units can be changed from °C
to °F or °F to °C by toggling the °C/°F
button. The current temperature unit will then
be shown on the digital display.
A comfortable set point for heating is
between 22°C (72°F) and 26°C (78°F).
Change the temperature set point inn small
amounts for best results. Once a
comfortable temperature is reached, this
temperature will be maintained without
adjusting the set point
AIR CONDITIONER
DEFROSTING OR DEFOGGING
OPERATION
Note: If the air conditioner is set to high
when using the defroster, the difference
between the external and internal
temperatures increases, and fog may form
on the outside of the windows. If this
happens, either turn the air conditioner OFF
or push the temperature control button to
increase the internal temperature.
This mode is used to be-ice, defrost, or
defog the windows by pressing the key with
the defrost icon. In certain cold or humid
conditions, more heat and airflow is required
to clear the windows. The set point
temperature and the blower speed should be
adjusted as necessary to maintain a clear
windshield at all times. For maximum defrost,
increase the set point temperature to the
maximum setting (32°C or 90°F) and
increase the blower speed to maximum fan
(not AUTO).
The air conditioner is enabled when in
defrost mode. The A/C is used to dehumidify
the air entering the cab to remove the fog
from the windshield.
The fresh/recirc door is forced to the fresh
position in defrost mode. Fresh air is used to
help remove the fog from the windshield.
Pressing the defrost key when it is active
(indicated by an illuminated light) will
deactivate the defrost mode and the system
will return to the settings that were in place
before the defrost mode was enabled.
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