Webasto Air Top HL32 D Workshop Manual

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6 Components
6.3 Exhaust and Com}lustion Air System
6.3.1 Pressure Equalizer (Exhaust/Intake Duct)
Description: The pressure equalizer is designed for
combustion air inlet and exhaust outlet and is connected
to the appropriate lines.
The pressure equalizer prevents the flame in the heater
from being "blown out". It prevents pressure differences
between combustion air inlet and exhaust outlet.
Note: The pressure equalizer is normally only required
for heaters with part load operation. For boats and
ships its installation is mandatory. In the area of the
outer skin of the vessel an insulating plate made of
V2A steel is to be inserted.
exhaust
intake pipe
Check: Remove dirt on and in the pressure equalizer.
Ensure that passage is unobstructed. Check hose connections
for security.
6.3.2 Exhaust Silencer
Check: Check for unobstructed passage and check
C02-content, if necessary.
In the case of severely contaminated heat exchangers
or flexible exhaust pipes the exhaust silencer must be
replaced.
)
Note: On boats and ships. insulation of the exhaust silencer
is only permitted using insulating tape (order no.
428 132, by the meter. or 443 247, on 25 m-rolls). Insulation
must be applied in at least 3 layers.
6.3.3 Flexible Exhaust Pipe
Check: Check for contamination. damage and restriction
of cross-sectional area (e.g. due to accumulated
condensation water. sharp bends). The maximum permissible
pipe lengths specified in the Installation Instructions
are to be adhered to.
Note: On boats and ships, insulation of the exhaust
pipe is only permitted using insulating tape (order no.
428 132, by the meter, or 443 247, on 25 m-rolls). Insulation
must be applied in at least 3 layers.
6.3.4 Combustion Air Pipe
condensate drain hole
Check: Check for unobstructed passage. The opening
must not point in upward direction so as to prevent the
ingress of water.
Note: The maximum permissible pipe lengths specified
in the Installation Instructions are to be adhered to.
The combustion air should be extracted from a dustfree
area, if possible.
26
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