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BBW 46 / DBW 46
Combustion Air Supply
The combustion air required must be drawn in from the out-
side of the vehicle.
The combustion air should be drawn in at a splash-water
protected location.
The combustion air intake opening must be so located that
the possibility of clogging due to contamination is remote.
It
must not point in the direction of travel.
The combustion air line can be so routed that it features sev-
eral bends (total of 270°, smallest bending radius 50 mm).
The combustion air line can have a length of max. 1000 mm.
On no account should the combustion air be extracted
from areas occupied by persons. If the heater is located in
an enclosed installation casing, a ventilation opening of at
least 3 cm2 is required.
Where the heater is installed in the vicinity of the vehicle tank
in a common installation space, combustion air must be
drawn in from the outside of the vehicle and the exhaust gas
be discharged to the atmosphere. The lead-through openings
must be splash-proof.
Exhaust Pipe
The exhaust pipe (inside diameter 22 mm) may have a
length of up to 5m and may feature several bends (in total
720°, smallest bending radius 50 mm).
The exhaust silencer is preferably to be mounted in the vi-
cinity of the heater.
It must not be installed near the combustion air intake
opening.
Operation of the BBW 46 / DBW 46 heater is also per-
missible without silencer.
The discharge opening of the exhaust pipe
in the direction of travel (see Fig. 14).
8
Fig 13:
Exhaust silencer
Direction of flow (optional)
direction of discharge approximately vertical 90°
Fig 14:
Exhaust Pipe Discharge Opening
Installation Position
Rigid pipes made of unalloyed steel with a minimum wall
thickness of 1.0 mm or flexible tubes of alloyed steel
should be used as exhaust pipes.
NOTE:
Any condensation water that may have collected in the ex-
haust pipe must be drained immediately. If necessary, it is
permitted to drill a condensation water drain hole.
must not point
Electrical Connections
Control Unit/Heater Connection
The electrical connection of the heaters is to be performed
in accordance with Fig. 16.
The connection of the digital timer should be carried out in
accordance with the circuit diagram shown in Fig. 15.
Vehicle Fan
The activation of the vehicle fan is controlled by the vehicle
fan relay, see circuit diagram shown in Fig. 16.
Connection of Telestart Receiver T60
The connection of Telestart receiver T60 is to be carried
out as shown in Fig. 16.
±
10°
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