8 Servicin
BBW 46 / DBW 46
808
Fig. 809 Installation Arrangement of Exhaust Pipe Outlet
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. For further requirements refer to official
regulations.
NOTE
Accumulations of condensate in the exhaust line must be
directly drained, a condensate drain hole may be provided
as required.
8.7 Removal and Installation
CAUTION
In installed condition only the following disassembly or
removal procedures are permitted should the top cover be
accessible and enough space for removal allow such
action:
– replacement of circulation pump
– replacement of temperature limiter or fuse
– replacement of temperature sensor
– replacement of combustion air fan
– replacement of flame sensor
– replacement of glow plug
– replacement of felt disk in burner head
8.7.1 Removal and Installation of Heater
8.7.1.1 Removal
1. Disconnect vehicle battery.
2. Remove top cover (see 9.2.1).
WARNING
Allow coolant to cool down sufficiently to prevent skin
burns. Also depressurise cooling system and refit cap
afterwards.
3. Disconnect electrical connector of wiring harness from
heater.
WARNING
Take precautionary measures to avoid fires.
4. Disconnect fuel supply inlet on heater and fit
protective cap on hose end.
5. Remove hose clamps and disconnect coolant hose
from heater.
6. Disconnect combustion air inlet and exhaust outlet on
heater.
7. Open tightening strap on heater and remove heater
from its support.
8.7.1.2 Installation
1. Locate heater for installation and temporarily secure
with tightening strap.
2. Reconnect coolant hoses and secure with hose
clamps. Tighten hose clamps with 1.5 Nm.
3. Connect fuel supply line to heater fuel inlet.
4. Secure combustion air inlet and exhaust outlet on
heater.
5. Fasten tightening strap with 3.0 ± 0.3 Nm.
6. Connect wiring harness connector to heater.
7. Plug on and arrest top cover.
8. Reconnect vehicle battery.
9. Bleed fuel supply system (see 8.8.1).
10. Bleed coolant circuit.
11. Perform functional test and check CO
2
setting.
8.7.2 Replacement of Circulation Pump
NOTE
The replacement procedure for the circulation pump is
identical with the heater installed or removed.
Perform replacement in accordance with 9.2.6.
WARNING
When removing from installed condition allow coolant to
cool down sufficiently to prevent skin burns. Also
depressurise cooling system and refit cap afterwards.
10°
10°
Direction of exhaust
flow nearly 90° ± 10°
(41 Seiten)
(18 Seiten)
(72 Seiten)
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