9.
Defrost Mode: Directs all airflow through the
defrost outlets. The air conditioner automatically
turns on in this mode. The recirculation button
will not work in this mode.
Temperature Control
The temperature-control switch is used to set the de-
sired temperature. Turn the temperature-control
switch clockwise, to the red area, for warm air. Turn
the switch counterclockwise, to the blue area, for
cool air.
Air Conditioning
The air conditioner cools and dehumidifies the air
inside the cab. Press the air-conditioning button to
turn the air conditioner ON and OFF. See
Fig. 7.3.
When the A/C is operating, the amber indicator on
the air-conditioning button will be illuminated regard-
less of whether the request for A/C comes from the
cab climate-control panel, or the sleeper climate-
control panel. When the instrument panel lights are
on, the snowflake indicator on the air-conditioning
button will be illuminated.
The A/C will automatically disable when the outside-
air temperature is low enough to make air condition-
ing ineffective, or conditions exist that put the HVAC
system into protection mode.
Recirculation
The recirculation mode limits the amount of outside
air entering the cab. It can be used to prevent dusty
or smoky air from entering the cab. The recirculation
mode can also decrease the time required to cool or
heat the cab interior during extreme outside tempera-
ture conditions. Press the recirculation button to acti-
vate it, or cancel it. When the recirculation mode is
ON, the amber indicator on the recirculation button
will be illuminated. See
Fig. 7.4.
The recirculation button will not work when the air-
selection switch is in one of the following modes:
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2
3
4
5
6
7
8
9
1. Face Mode
2. Selection Between Face Mode and Bi-Level Mode
3. Bi-Level Mode
4. Selection Between Bi-Level Mode and Floor Mode
5. Floor Mode
6. Selection Between Floor Mode and Floor/Defog
Mode
7. Defog Mode
8. Selection Between Defog Mode and Defrost Mode
9. Defrost Mode
Fig. 7.2, Air Selection Modes
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1. Amber Indicator
Fig. 7.3, Air-Conditioning Button
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1. Amber Indicator
Fig. 7.4, Recirculation Button
Climate Control
7.2
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