DBW 2010 / 2016 8 Servicing Work
808
8.8 Start-up
After the heater has been installed, the coolant circuit and
the fuel supply system must be carefully bled. The specifica-
tions of the vehicle manufacturer must be observed when
doing so. All coolant and fuel connections must be checked
for leaks and secure attachment during the test run. Should
a fault occur in the heater during operation, then trouble-
shooting must be carried out (see Section 5).
8.8.1 Bleeding water circuit
NOTE
Bleeding must always be carried out according to the manu-
facturer's instructions. The circulation pump must not be
switched on for bleeding.
Set the original vehicle heating system to "hot" and top up
the coolant according to manufacturer's instructions. Oper-
ating the heater without antifreeze is not permitted.
Then allow the vehicle engine to run at increased idling speed
until the radiator thermostat has opened. Switch off the vehi-
cle engine and check the coolant level; top up the coolant if
necessary.
Switch on the heater and the original vehicle heater fan with
the vehicle engine switched off. After a certain cooling time,
the heater must automatically switch on and deactivate. If
the heater is then not switched on again, the temperature
limiter on the heater has been tripped, as the heater has not
been properly bled yet. Reset the temperature limiter (press
the button on the temperature limiter) and repeat the entire
bleeding process.
NOTE
The heater can be equipped with an automatically resettable
temperature limiter. In this case, manual resetting is elimi-
nated.
8.8.2 Bleeding fuel supply system
When the heater is switched on, the fuel pump primes the
fuel and fills the entire fuel supply system.
Should combustion not yet begin with the first starting proc-
ess, the heater must be switched off and then switched on
again.
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