Technical data

Air Top 2000 ST Servicing work
805
8.6.5 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.
NOTE
The combustion air must be extracted using a combustion
air line from a position that is as cool as possible and
protected from splashing water for petrol heaters.
If the heater is in a sealed installation box, the combustion
air must be drawn in from the outside and the emissions fed
to the outside. Pipe passage holes must be made in such a
way as to ensure that the ingress of exhaust fumes into the
interior of the vehicle should not occur.
If dirty combustion air is expected, a combustion air filter
may be fitted (only Air Top 2000 ST D). An intake silencer
must be used for an intake hose length of < 0.6 m.
8.6.6 Exhaust pipe
Rigid pipes of unalloyed or alloyed steel with a minimum
wall thickness of 1.0 mm or flexible piping of alloyed steel
only must be used as exhaust line. The exhaust pipe must be
secured to the heater and exhaust silencer with a pipe clip,
Part No. 20965A.
The exhaust silencer (Fig. 809) should ideally be installed
near the heater. The flow direction is arbitrary.
Fig. 809 Exhaust silencer
The heater may also be operated without a silencer.
8.6.7 Combustion air inlet and exhaust lines
To prevent damaging the metering pump cable, exhaust line
must not be used to extend the combustion air supply line.
Length of the combustion air intake and exhaust lines:
with silencer: max. 2.0 m
without silencer: max. 5.0 m
Both lines are to be installed falling away from the heater. If
this is not possible, a condensate drain hole with a diameter
of 4 mm must be made at its lowest point or a connection
element with a condensate drain used.
Internal diameter of the lines:
Combustion air line: 22 mm
Exhaust line: 22 mm
NOTE
If the exhaust line is 2 m or more, insulated exhaust lines
must be used (to prevent the temperature falling below the
dew point).
Minimum bending radius: 50 mm
An attachment is required no further than 150 mm from the
end of the exhaust pipe to ensure that the angle of
90° ± 10° is achieved.
Fig. 810 Exhaust pipe ends, installation position
WARNING
If the exhaust pipe ends is other than as shown in the
Fig. 810 it will pose a fire risk.
Total bends:
Combustion air line: max. 270°
Exhaust line: max. 270°
ø 6,5
10°
10°
Discharge direction
almost vertical
90° ± 10°