Technical data

Thermo 90 S / Thermo 90 ST Combustion air supply

7 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.

The combustion air intake line (internal diameter at least 30 mm) may be

0.5 m to 5 m long with several bends totalling 360°. The minimum

bending radius is 45 mm.

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 measuring at least 6 cm

is required if the heater

is installed in an enclosed box. The size of the ventilation opening must

be increased accordingly if the temperature in the box exceeds the

permitted ambient temperature of the heater (see Technical data).