Cab Climate-Control Panel
Fan Control
The fan switch controls the rate that air is blown
through the selected air outlets. It has 8 fan-speed
settings, and an OFF position. See
Fig. 7.1. To in-
crease the airflow, turn the switch clockwise to a
higher number. To decrease the airflow, turn the
switch counterclockwise to a lower number. Setting
the fan switch at the OFF position disables the cab
air conditioning (A/C), and sets the air source to
fresh-air mode.
NOTE: When the sleeper A/C is running, even
though the cab fan switch may be in the OFF
position, the cab fan will operate at low speed.
This is necessary to protect the evaporator in
the cab HVAC system from freezing.
There is a slight delay between the time the engine
is started and the blower is operational. It can take
an additional 4 seconds for the blower to reach high
speed. The blower motor performs a self-test imme-
diately after the engine is started, which causes the
delay.
Air Selection
The air-selection switch allows you to direct the flow
of air through the face outlets, the floor outlets, the
defrost (windshield) outlets, or a combination of
these outlets.There are a total of 9 possible air-
selection modes. See
Fig. 7.2.
1.
Face Mode: Directs all airflow through the face
outlets in the instrument panel.
2.
Selection between Face Mode and Bi-Level
Mode: Directs 75 percent of the airflow through
the face outlets, and 25 percent through the floor
outlets.
3.
Bi-Level Mode: Directs the airflow equally to the
face outlets and floor outlets.
4.
Selection between Bi-Level Mode and Floor
Mode: Directs 25 percent of the airflow through
the face outlets, and 75 percent through the floor
outlets.
5.
Floor Mode: Directs all airflow through the floor
outlets.
6.
Selection between Floor Mode and Floor/
Defog Mode: Directs 75 percent of the airflow
through the floor outlets, and 25 percent through
the defrost outlets.
7.
Defog Mode: Directs the airflow equally to the
floor outlets and the defrost outlets. The air con-
ditioner automatically turns on in this mode. The
recirculation button will not work in this mode.
8.
Selection between Defog Mode and Defrost
Mode: Directs 75 percent of the airflow through
the defrost outlets, and 25 percent through the
floor outlets. The air conditioner automatically
turns on in this mode. The recirculation button
will not work in this mode.
08/21/2009
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1. Climate-Control Panel
2. Fan Switch
3. Recirculation Button
4. Air-Selection Switch
5. Air-Conditioning Button
6. Temperature-Control Switch
7. Bunk-Override Switch
Fig. 7.1, Cab Climate-Control Panel
Climate Control
7.1
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