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i
Note that the battery may discharge if the
auxiliary ventilation is left running.
Electrical auxiliary air conditioning
General notes
The auxiliary air conditioning cools the air inside
the vehicle to the set temperature regardless of
whether the engine is running or not.
The auxiliary air conditioning is operated using
the automatic climate control panel
Y
(
page 116) or the bed/berth switch panel
Y
(
page 124).
The auxiliary air conditioning can be activated/
deactivated manually (immediate cooling mode)
or up to 2 switch-on times can be defined.
The operating time of the auxiliary air condition-
ing system depends on:
the external conditions – outside temperature
R
and sunlight
the set interior temperature
R
the charge status and age of the batteries
R
the use of other electrical consumers
R
the driving cycle
R
The operating time of the auxiliary air condition-
ing system can be up to 8 hours. The operating
time of the auxiliary air conditioning system
decreases with the age of the batteries.
The auxiliary air conditioning system is not sup-
plied with voltage from separate auxiliary bat-
teries but solely from the vehicle's battery. The
output of the auxiliary air conditioning system is
automatically reduced in increments or
switched off to preserve the starting ability of
the vehicle and the service life of the battery.
After an automatic deactivation, the auxiliary air
conditioning system can be switched on again
once the battery has been loaded after a suffi-
cient driving time. In short-distance driving, the
charging phases are too short to sufficiently
charge the batteries to operate the auxiliary air
conditioning system. In this case, use of the
auxiliary air conditioning system may be restric-
ted.
Observe the notes on battery maintenance and
Y
care (
page 366).
i
When driving, cool the cab to a comfortable
temperature. At very high exterior tempera-
tures, minimise using other electrical devices
Electrical auxiliary air conditioning
in the cab before and while using the auxiliary
air conditioning.
If you close the curtains and move the backrests
forwards, less heat will enter the cab and the
auxiliary air conditioning will be more effective.
The auxiliary air conditioning control system
supplements the cooled air inside the vehicle
with fresh air when required. This means you
can keep the windows closed during an over-
night stop or when parked for long periods.
When switched on, the blower of the auxiliary air
conditioning operates in an automatic mode,
which can be switched off if necessary. In auto-
matic mode, the auxiliary air conditioning con-
trols the airflow automatically. In automatic
mode, when the temperature of the outside air is
sufficiently low to cool the air inside the vehicle,
the auxiliary air conditioning switches to a fresh
air mode. Therefore, the service life increases
since the battery is treated with sufficient care.
If auxiliary heating is activated manually or by
the switch-on time, auxiliary air conditioning
Y
(
page 126) and residual engine heat utilisa-
Y
tion (
page 122) are deactivated automatically.
Setting the air distribution
For an even distribution of air in the cab, the air-
recirculation mode and the blower of the auto-
matic air conditioning are automatically
switched on. Fresh air intake is automatically
fed into the air inside the vehicle.
In automatic mode the cooled air flows from the
centre and side air vents. Adjust the centre and
side air vents as necessary.
If you also use the upper bed:
X
Close the side air vents.
X
Open the centre air vents fully and adjust so
that the airflow is directed inwards and up as
much as possible.
123
Z
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