freightliner CENTURY CLASS S Driver Manual page 70

Heater and Air Conditioner
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 bat-
teries located between the frame rails. These batter-
ies 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.
Operation
IMPORTANT: Before operating the Parked
HVAC system, make sure that the intake and
outlet vents for the A/C and heater units are
clear. Blocked vents will hamper the operation
of the unit.
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. 4.12. See
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.
4.9
Table 4.1 for a description
1
2
3
4
AUTO
5
6
08/29/2007
1. Temperature Control
Dial
2. Mode Switch
3. A/C Only
Fig. 4.12, Parked A/C and Heater Control Panel
Parked A/C and Heater Mode Switch Operation
Mode
Off Turns the unit off.
Allows the unit to automatically heat or
cool the sleeper, depending on the
temperature setting and the sleeper
AUTO
temperature. Adjusts the compressor,
heater, and fans to keep temperature
constant.
Allows only the heat portion of the system
Heat Only to run. Adjusts the heater only to keep the
temperature constant.
Allows only the A/C portion of the system
A/C Only to run. Adjusts compressor and fans only
to keep the temperature constant.
Table 4.1, Parked A/C and Heater Mode Switch
Operation
f831760
4. Heat Only
5. AUTO
6. Off
Function