Shorten combustion air line only at the end that is not pro-
vided with a fastening clip.
Prior to installing the heater make sure that the combus-
tion air intake connection has been mounted to the heater.
Under no circumstances must the combustion air be ex-
tracted from driver’s cabs or passenger compartments. If
the heater is installed in an enclosed housing a vent hole
of at least 3 cm
2
is required.
If the temperature in the installation housing exceeds the
permissible ambient temperature of the heater the vent
hole must be enlarged after consulting Webasto.
The combustion air intake opening must be so positioned
as to prevent any clogging due to contamination. It must
not point in the direction of travel.
When the heater is installed in the vicinity of the vehicle
tank in a common installation space, combustion air intake
must be from the outside of the vehicle and the exhaust
gas must be discharged to atmosphere. Appropriate cu-
touts must be splash-proof.
Support Plate
The support plate must be secured to the chassis or the in-
termediate support using at least 4 M6 screws.
It is mandatory that washers and spring lock washers be
used.
In the case of level chassis surfaces, the washers used
must be at least 22 mm in diameter.
No sheet-metal screws must be used to secure the heater
mounting plate (support plate).
Insert Plate
The insert plate serves to connect exhaust gas and com-
bustion air lines.
The heater may be fastened to the mounting plate turned
by 180° provided the insert plate has also been turned ac-
cordingly.
The exhaust gas line is preassembled at the insert plate
whereas the combustion air line is to be attached by
means of a hose clamp during installation.
The insert plate is to be mounted to the bracket by means
of 2 M3 screws.
NOTE:
A coding is provided on the insert plate to ensure proper at-
tachment of exhaust gas and combustion air connections
of the heater relative to the insert plate.
Gasket at Exhaust Gas Outlet
Make sure that the gasket is fitted.
The gasket provided at the exhaust gas outlet of
the heater is to be replaced prior to each reinstal-
lation.
Exhaust Gas Pipe
The exhaust gas line (inside diameter 22 mm) is permitted
to have a length of up to 2 m and may feature several
bends (total of 270°, smallest bending radius 50 mm).
The exhaust gas line as a whole must not be shorter than
500 mm.
The exhaust muffler should preferably be installed near the
heater, but at least 200 mm away from the heater.
The exhaust silencer must not be mounted in the vicinity of
the combustion air intake opening.
M3 x 8 DIN695
Insert plate
Exhaust
gas pipe
CAUTION:
Do not use sheet-metal
screws for attaching in-
sert plate.
Fig. 9: Insert plate
Mounting position
Fig. 10: Exhaust Gas Seal
Thermo Top
22
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