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Air Top 2000
8.6.5 Combustion Air Supply
Combustion air must under no circumstances be ex-
tracted from rooms with persons. The combustion air
inlet must not point towards the forward direction of mo-
tion. It must be located so that no clogging by contamina-
tion is to be expected.
For fuel operated heaters the combustion air tap must
be located in a possibly cool and splash water proof posi-
tion using a combustion air line.
If the air heater is located in a closed installation box,
combustion air must be taken in from and the exhaust
routed to the exterior. The feedthroughs must not allow
exhaust fumes to enter the vehicle interior.
If a contamniated combustion air supply is expected, a
combustion air filter (Ident No. 21963A) can be fitted
(Air Top 2000 D only).
8.6.6 Exhaust Line
Rigid pipes made of unalloyed or alloyed steel with a
minimum wall thickness of 1.0 mm have to be used as
exhaust line or flexible pipes made of alloyed steel only.
The exhaust pipe is secured to the air heater e.g. with a
clamp.
The exhaust muffler is preferably mounted near the air
heater. The direction of flow is optional.
ø 6,5
Fig. 808 Exhaust Muffler, Direction of Flow
Operation of the air heater is also permitted without
muffler.
8.6.7 Combustion Air Intake and Exhaust Lines
In order to avoid damage to the dosing pump cable, no
exhaust line may be used for the elongation of the com-
bustion air intake line.
Length of the combustion air intake and exhaust line:
with muffler:
max. 2.0 m
without muffler:
max. 5.0 m
NOTE
Both lines must be routed away from the heater in a de-
scending attitude. If this is not possible, a condensate
drain hole ø 4 mm must be provided at the lowest point.
Inner diameter of lines:
Combustion air line:
22 mm
Exhaust line:
22 mm
When exceeding an exhaust line length of 2 m, insulated
exhaust lines have to be used (below minimum dew
point).
Smallest bending radius:
In order to ensure the angle of 90° ± 10°, an attachment
is required not further than 150 mm away measured
from the exhaust pipe end.
Fig. 809 Exhaust Pipe Outlet, Installation Position
WARNING
Any exhaust exit direction other than the one shown in
Fig. 809 may cause fires.
Sum of bends:
Combustion air line:
max. 270°
Exhaust:
max. 270°
8
Servicing
NOTE
50 mm
Exhaust exit direction
nearly vertical 90° ± 10°
805
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