Daimler Freightliner Cascadia 2021, Driver Manual

Page: 172 / 322

Fan Switch
The fan knob activates the fan, which forces air
through the air outlets. The fan knob has ten fan
speeds and an OFF position. See
Fig. 8.5 .
To operate the fan knob, turn the knob clockwise to
increase airflow; turn the fan knob counterclockwise
to decrease airflow. If the vehicle has Optimized Idle,
the fan will not operate with the key in accessory
mode. Optimized Idle may also turn the fan off to
reduce stress on the batteries. Refer to
Chapter 13
for more information.
When the cab air conditioner (A/C) is on, it is normal
for the sleeper fan to operate at low speed even if
the sleeper fan knob is in the off position. This is
necessary to protect the evaporator in the sleeper
heater and air conditioner system from freezing. At
lower fan speed settings, a slight increase in airflow
levels may appear at times, as the control acts to
regulate the evaporator temperature.
When the park brake is set, any temperature or
blower speed setting changes on the bunk HVAC
unit control panel will be mimicked by the front HVAC
unit. For example, if you set bunk blower speed to HI
and the temperature to COLD, the front unit will also
operate on HI/COLD.
When the park brake is not set, the front and rear
HVAC settings function independently, unless the
bunk override button is pressed, or "minimum AC
support" is required.
Minimum AC support is when the front unit is off and
the bunk unit is set such that AC is requested (needs
the AC compressor to run). In this case, the front unit
will go into minimum AC support mode by operating
the front blower at minimum speed to prevent the
front unit evaporator from freezing up. This is also
true, if the rear unit is off and the front unit is set
such that AC is requested, in order to prevent the
bunk evaporator from freezing up.
Temperature Control Knob
The temperature control knob is used to select the
desired temperature in the sleeper. Turn the switch
counterclockwise for cool air, or clockwise for hot air.
Air Conditioning Button
The A/C cools and dehumidifies the air inside the
sleeper. Press the air conditioning button, located in
the center of the temperature control knob to turn the
A/C on and off.
Smartway Certified Parked Heater
Operation
All vehicles equipped with diesel operated coolant
heaters are "Smartway Certified". The coolant heater
will keep the engine coolant between approximately
150 and 180°F (65 and 82°C). Heated coolant is
routed through the auxiliary HVAC heater core to
allow heater-only function of the auxiliary HVAC sys-
tem.
System Operation
1. Turn the block heater on.
2.
Set the temperature dial to the desired heat set-
ting.
3.
Turn the HVAC blower on.
Accessory Heaters
Optional accessary heaters are available from the
factory in several configurations. Familiarize yourself
with the equipment on your specific vehicle, and fol-
low the manufacturer’s operating and maintenance
instructions.
WARNING
Do not operate fuel-operated heaters in an area
where flammable vapors, including gasoline or
diesel fumes, are present, such as at filling sta-
tions and oil depots. Turn off a fuel-operated
heater and allow it shut down completely before
entering an area where flammable gases or liq-
uids are present. Heaters continue to operate for
up to three minutes after being turned off.
09/09/2016 f611328
3
1
2
1. Fan Knob
2. Temperature Control Knob
3. Air Conditioning Button
Fig. 8.5, Sleeper Climate Control Panel
Climate Controls
8.3