Heater and Air Conditioner

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.

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. 4.2 .

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.

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. 4.3 .

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 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. 4.4 . 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.

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

The bunk override (BUNK OVRD) switch allows the driver to remotely control the fan speed and temperature settings in the sleeper. See Fig. 4.1 . 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.

The fan switch controls the sleeper heater and air conditioner system fan speed. The sleeper climate control panel 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.

The temperature control switch is used to select the desired temperature in the sleeper. Turn the switch clockwise or to the red area for warm air. Turn the switch counterclockwise or to the blue area for cool air.

The air conditioner automatically turns on when necessary to maintain the selected temperature in the sleeper. If the sleeper air conditioner automatically turns on when the cab air conditioner is on, the cab air conditioner fan speed and temperature settings will override the sleeper air conditioner settings.

The CDTC system is disabled when the temperature control switch is in the maximum cool or maximum warm positions.

The bunk override switch allows the driver to remotely control the temperature and fan speed settings in the sleeper. The bunk override mode can be canceled by changing the sleeper fan speed or temperature setting. 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 on the switch will be off.

The Bergstrom NITE (No Idle Thermal Environment) parked, or no-idle, air conditioning system is a compact, electrically powered, 3000-BTU system. It is designed to provide a means of air conditioning to the sleeper area without having the engine running. It is completely self-contained, and runs on 12-volt deep-cycle batteries. The system is designed to maintain cool air in the sleeper interior. For optimal operation, the curtain between the cab and the sleeper must be closed when using the A/C system. The parked A/C unit will not cool down a hot sleeper that has been sitting in the sun without the vehicle A/C running. If the interior temperature is higher than desired, start the engine and run the vehicle A/C system until the desired sleeper temperature is achieved. This will help cool the sleeper to a temperature that the parked A/C system can maintain. Once the sleeper temperature is lowered, the system will maintain a comfortable setting.

The A/C unit is located under the lower bunk in the sleeper compartment. The unit gets its intake air from the under-bunk area through a grate in the top panel. An air intake grille is located on the front panel of the lower bunk. The outlet ducting runs from the left side of the unit to an outlet near the bunk occupant's face on the back wall of the sleeper. It is important to keep the air intake grille, and the area under the bunk, free of objects that might block air flow or put objectionable odors into the cooling air. Air for the condenser is taken in from under the cab and exhausted through another opening in the cab floor.

The system receives power from four deep-cycle batteries located between the frame rails. These batteries are completely isolated from the starting batteries to keep the starting batteries from being drawn down during operation.

The heater unit is located under the lower bunk in the sleeper compartment next to the A/C unit. The unit gets its intake air through a duct attached to a grille located on the right side of the front panel of the lower bunk. The outlet ducting runs from the back of the unit to a grille on the left side of the front panel of the lower bunk.

The control panel for the parked A/C and heater is located on the back wall of the sleeper near the left side. It has a temperature control dial, and a four-position mode selector switch. Turn the temperature control dial to the left for cooling, and to the right for heat. See Fig. 4.6 . See Table 4.1 for a description of the function of the mode switch.

The system must be turned off whenever it is not in use, or the batteries may not charge properly. After using the system, turn the mode switch to the OFF position, even if the unit is not running.