Technical data

BBW 46 / DBW 46 8 Servicin
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801
8. Servicin
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8.1 General
This section describes the servicing procedures allowed
on the heater when installed.
8.2 Work on the Heater
As long as the heater is in operation or in run-down, the
battery main power supply must not be disconnected to
prevent the heater from overheating and response of the
overheat protection.
For any type of work on the heater the main power supply
cable is to be disconnected from the vehicle battery.
When performing extensive repairs on the heater its
complete removal is considered appropriate.
After work on the heating circuit replenish with a water and
anti-freeze mixture according to manufacturer's
instructions and bleed water circuit thoroughly.
Repairs requiring a change of location the relevant
installation instructions and the vehicle specific heater
installation proposal have to be observed.
8.3 Work on the Vehicle
CAUTION
In the vicinity of the heater a temperature of 100 °C and in
the vicinity of the control unit 85 °C must never be
exceeded (e.g. during paint work on the vehicle).
8.4 Heater Test Run
The heater must not be operated, not even with the timer,
in enclosed areas like garages or workshops not provided
with exhaust ventilation facilities.
8.5 Servicin
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To ensure functional reliability of the heater the following
servicing should be performed before each heating
season:
• clean air heater exterior (prevent the ingress of water).
• examine electrical connections for corrosion of
contacts and for security.
• check combustion air and exhaust ducts for damage
and obstructions.
• check fuel line and fuel filter for leakage.
• check coolant circuit and circulation pump for leakage.
• check hoses for cracks.
• replace fuel filter if installed.
• perform heater test run (check exhaust CO
2
contents
during test run).