Webasto Thermo 90 ST Installation Instructions Manual - page 20
Exhaust gas
49
9
Exhaust System
9.1.
Exhaust pipe
The exhaust pipe (inside diameter 38 mm) can be routed with several bends
(360° altogether, minimum bending radius 85 mm).
The total line length must be between 0.5 and 5 mm.
Lines approved by Webasto must be used as exhaust pipes.
9.2.
Exhaust silencer
It is not permissible to operate the Thermo 90 ST WDT heater without
exhaust silencer.
The exhaust silencer must be installed near the heater and must not be
installed near the intake opening for the combustion air.
9.3.
Recommendations for installation
The exhaust silencer and the exhaust pipe may not be fastened to tem-
perature-sensitive vehicle parts (e.g. brake line, electr. lines, vehicle control
units, headlights, underbody protection, plastic parts, etc.) and must be a
sufficient distance of at least 40 mm from them.
Only approved Webasto spacer brackets may be used with this application.
The exhaust pipes are sufficiently fixed in place to ensure the minimum
distances even during driving.
It is recommended that the exhaust application be installed splash-water
protected.
The exhaust pipe is secured to the heater using a clamping collar, for
example.
Exhaust gases escaping from condensed-water drain holes may not blow
onto temperature-sensitive vehicle parts.
The exhaust outlet must be located so as to prevent emissions from
entering the vehicle through ventilators, heated air inlets or opening
windows.
(Requirement from ECE-R 122, Point 5.3.4.1.).
The exhaust outlet must be unobstructed. It must not be directed at vehicle
parts. The exhaust outlet may not be located within the range of throw of
the wheels.
Watch the maximum steering angle of the front wheels. It must be ensured
that the exhaust outlet is not clogged and cannot be damaged under any
operating conditions.
The opening of the exhaust pipe must not point in the direction of travel.
The exhaust pipe should be secured no further than 150 mm from the end
of the exhaust pipe to ensure that the angle of 90° ± 10° is achieved
See Fig. 14.
After passing through the underbody cover, the exhaust pipe must be ex-
tended by another 10 mm.
When installing the exhaust silencer, it must be ensured that
the condensed water can run off through the condensed-wa-
ter drain hole of the silencer.
Collections of condensed water in the exhaust pipe must be
drained off directly. If necessary, a condensed-water drain hole
may be drilled at the lowest point.