Combustion Air Supply - Webasto Thermo 230 Installation Instructions Manual

Thermo 230/231/300/301/350
8

Combustion air supply

Under no circumstances may the combustion air be taken from areas
occupied by people. The combustion air intake opening must not point
in the direction of travel. It must be located so that it cannot become
clogged with dirt or snow and cannot suck in splashing water.
Maximum dimensions of the air intake line:
– Internal diameter: 55 mm
– Maximum line length: 5 m without the exhaust extension
– Maximum bends: 270°
– Total length of air intake line and exhaust pipe max. 5m
The combustion air intake must not be routed above the exhaust outlet.
NOTE:
If the combustion air intake line cannot be installed so that it slopes
downwards, a water drain hole with a diameter of 4 mm is to be made at
its lowest point.
If the heater is installed in a general installation space near the vehicle's
fuel tank, the combustion air must be taken in from the outside and the
exhaust fumes discharged into the atmosphere. The openings must be
splash-proof.
A ventilation opening is required if the heater is installed in an enclosed
box.
Thermo 230 / Thermo 231 / Thermo 300 / Thermo 301 30 cm
Thermo 350
The size of the ventilation opening must be increased subject to
consultation with Webasto if the temperature in the box exceeds the
permitted ambient temperature of the heater (see Technical data).
2
2
35 cm
Combustion air supply
53