Cab Climate Control Panel

The climate control panel allows you to control the heating and air conditioning functions of the heater and air conditioner. See Fig..

Bunk Override Switch

Fan Switch

Recirculation Button

Air Selection Switch

Air Conditioning Button

Temperature Control Switch

Fig. 1, CDTC Climate Control Panel

Fan Switch

The fan switch controls the fan speed and forces fresh air or recirculated air through the selected air outlets. The fan switch has eight fan speeds and an off position.

To increase airflow, turn the switch clockwise or to a higher number. To decrease the airflow, turn the switch counterclockwise or to a lower number. Setting the fan switch to the off position disables the air conditioner and places the air source in the fresh air mode.

There is a two-second delay between the time the engine is started and the blower is operational. It can take an additional four seconds for the blower to reach high speed. The blower motor performs a self-test immediately after the engine is started, which causes the delay.

Air Selection Switch

The air selection switch allows you to control the flow of air through the face outlets, the floor outlets, the defrost (windshield) outlets, or a combination of these outlets to give you nine air selection modes. See Fig..

Face Mode

Selection Between Face Mode and Bi-Level Mode

Bi-Level Mode

Selection Between Bi-Level Mode and Floor Mode

Floor Mode

Selection Between Floor Mode and Floor/Defog Mode

Defog Mode

Selection Between Defog Mode and Defrost Mode

Defrost Mode

Fig. 2, Air Selection Switch Modes

1. Face Mode: Directs all airflow through the face or instrument panel outlets.

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 conditioner 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.

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 Switch

The temperature control switch is used to select the desired temperature. On the manual and CDTC climate control panel, turn the switch clockwise or to the red area for warm air. Turn the switch counterclockwise or 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..

Amber Indicator

Fig. 3, Air Conditioning Button

When the air conditioner is operating, the amber indicator on the air conditioning button will be on whether the request for air conditioning 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 on.

The air conditioner will be automatically disabled when:

• The outside air temperature is low enough to make air conditioning ineffective;

• The engine is running at low rpm;

• Specific conditions exist that result in the heater and air conditioner system going into protection mode.

Recirculation

The recirculation mode limits the amount of outside air entering the cab. Press the recirculation button to prevent dusty or smoky air from entering the cab. See Fig.. The recirculation mode can also decrease the time required to cool or heat the cab interior during extreme outside temperature conditions. When the recirculation mode is on, the amber indicator on the recirculation button will be on.

Amber Indicator

Fig. 4, Recirculation Button

The recirculation button will not work when the air selection switch is in one of the following modes:

• defog mode

• the selection between defog mode and defrost mode

• defrost mode

Bunk Override Switch, Optional

The bunk override (BUNK OVRD) switch allows the driver to remotely control the fan speed and temperature settings in the sleeper. See Fig.. Press the upper half of the bunk override switch to override the sleeper settings with the cab settings. The amber indicator on the switch is on when the bunk override mode is on. If the fan speed or temperature setting on the sleeper climate control panel is adjusted when the bunk override mode is on, the bunk override mode will be canceled.

When the heating and air conditioning system is in the bunk override mode, the cab climate control panel can be adjusted without affecting the sleeper settings. To reset the sleeper settings, set the fan speed and temperature settings on the cab climate control panel to the desired sleeper settings and press the upper half of the bunk override switch again. The cab climate control panel can again be adjusted without affecting the sleeper settings.

Press the lower half of the bunk override switch to cancel the override mode. After the override mode is canceled, the sleeper heater and air conditioner system will operate from the sleeper fan speed and temperature settings and the amber indicator will be off.