Webasto Thermo Pro 90 D, Installation Manual

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www.webasto.us 23 Webasto Thermo & Comfort N.A., Inc.
Thermo Pro 90 Combustion Air Supply
9. 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 in that it cannot become clogged with
dirt or snow and cannot suck in splashing water.
IMPORTANT!
The combustion air must be extracted using
a combustion air tube from a position that
is as cool as possible and protected from
splashing water.
The combustion air intake tube (internal diameter at least
30 mm) may be 0.5 m to 5 m (1.6 ft to 16 ft) long with
several bends totalling 360°. The minimum bending
radius is 45 mm (1.75 inches).
The combustion air intake must not be routed in the
vicinity of the exhaust discharge.
IMPORTANT!
A minimum of 0.5m of the combustion air
tube must be installed on every
application.
IMPORTANT!
If the combustion air intake tube cannot be
installed so that it slopes downwards, a
water drain hole with a diameter of 4 mm
(5/32”) is to be made at its lowest point.
If the heater is installed in the vicinity of a fuel source, the
combustion air tube must be routed in a way to prevent
fumes from entering. The openings must be splash-
proof.
A ventilation opening measuring at least 7 cm² 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).