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Auxiliary heating
Important safety notes
G
DANGER
If the exhaust pipe is blocked or sufficient
ventilation is not possible, toxic exhaust
fumes may enter the vehicle, especially car-
bon monoxide. This is the case in enclosed
spaces or if the vehicle is stuck in snow, for
example. There is a risk of fatal injuries.
Switch off the auxiliary heating in enclosed
spaces without extraction systems, e.g. in a
garage. If the vehicle is stuck in snow and you
have to leave the auxiliary heating running,
keep the exhaust pipe and the area around the
vehicle clear of snow. To guarantee a suffi-
cient supply of fresh air, open a window on the
side of the vehicle away from the wind.
G
WARNING
You could burn yourself on the exhaust pipe if
the auxiliary heating system has been run-
ning. There is a risk of injury.
Let the exhaust pipe cool down before carry-
ing out work on the auxiliary heating system.
!
If the auxiliary heating has not been used for
an extended period, exposure to heat and
condensation can lead to deposits forming in
the auxiliary heating fuel system. These
deposits can cause the auxiliary heating to
malfunction. Have the auxiliary heating
checked and repaired at a qualified specialist
workshop before using it again.
The auxiliary heating system should be
!
switched on once a month for approximately
15 minutes. Otherwise, the auxiliary heating
could be damaged.
!
The auxiliary heating may only be operated
with conventional diesel fuel. Operating with
100 % fatty acid methyl ester (FAME) fuel or
diesel fuel with an admixture of more than
10 % fatty acid methyl ester (FAME) fuel can
lead to malfunctions and is therefore not per-
mitted.
An additional fuel tank for conventional diesel
fuel is required for the auxiliary heating sys-
tem, if you operate the vehicle:
Auxiliary heating
using fatty acid methyl ester (FAME) fuel
R
using conventional diesel fuel with the addi-
R
tion of more than 10 % fatty acid methyl
ester (FAME) fuel
The auxiliary heating system operates inde-
pendently of the engine and complements the
vehicle heating. Auxiliary heating can also be
switched on when the engine is running and at
low outside temperatures to support the heating
(heater booster function).
Auxiliary heating is operated using the control
panel of the heating, air-conditioning system or
automatic climate control (
the bed/berth switch panel.
Auxiliary heating heats the cab. If your vehicle is
equipped with an engine preheating system,
auxiliary heating can also heat the coolant. The
engine preheating system therefore also
reduces the load on the engine and saves fuel.
Auxiliary heating can be activated/deactivated
manually or up to 2 switch-on times can be
defined.
If auxiliary heating is activated manually or via
the switch-on times, auxiliary air conditioning
Y
(
page 123) and residual engine heat utilisation
Y
(
page 122) are deactivated automatically.
Mandatory switch-off
!
Only use the battery isolator switch when
the auxiliary heating is running if there is a risk
of danger. If the heater is switched off without
a run-on period, it may be damaged.
Vehicles transporting hazardous goods: you
must switch off the heater before entering a
hazardous area (e.g. a refinery).
For safety reasons for these vehicles:
no switch-on time can be set
R
the engine preheating can only be activated
R
with the immediate heating mode
The heater automatically switches off if you
switch off the engine or engage power take-off.
The combustion air blower continues to operate
briefly after it has been switched off and then
switches off automatically.
Y
page 116) or using
Z
125
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