Technical data

8. Service Tasks DBW 2010 / 2012 / 2020 / 2022 / 300 / 350
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8.8 Commissioning
The air in the cooling liquid circuit and the fuel supply
system must be carefully evacuated after the heating
device has been mounted. The instructions of the vehicle
manufacturer must be observed during the course of this
act. The imperviousness and tightness of all cooling liquid
and fuel connections must be checked during the test
operation. The error search acts must be carried out if the
heating device indicates defect during the operation (refer
to Section 5).
8.8.1 Evacuating the air from the water circuit
WARNING
As a matter of principle, the acts of the evacuation of air
will be carried out in accordance with the instructions of
the manufacturer. The circulation pump should not be
used for the evacuation of air.
Bring the heating system of the vehicle to the “warm”
position and fill the system with water and cooling liquid
(in order to protect against corrosion), which must consist
of at least 10 % anti-freeze (glycol based). The protection
against corrosion will not be accomplished when only
water will be used and a partial loss of cooling water will
ensue in case of excessive warming resulting from the
fact that the boiling point of water is low and consequently
it will be necessary to constantly add water. The
admixtures in the cooling liquid should not harm metal,
plastic or rubber parts and should not lead to the
formation of sediments.
After that, operate the vehicle engine at high revolution of
idle status until the radiator thermostat will be opened.
Stop the vehicle engine and check the level of the cooling
liquid and add cooling liquid if necessary.
Operate the heating device and the heater fan while the
vehicle engine is not working. The heating device should
be set in motion after a certain cooling period and stop
the operation. In the case that the heating device will be
re-activated after this, the heat constrainer in the heating
devices will be triggered because the air in the heating
device has not been fully evacuated. Set the heat
constrainer to zero (push the button of the heat
constrainer) and repeat the act of air evacuation.
WARNING
The heating device may be equipped with a heat
constrainer that will be set automatically to zero. In that
case, there will be no need to manually set to zero
8.8.2 The evacuation of air from the fuel supply
system
The fuel pump will take fuel when the heating device will
be operated and fills the entire fuel supply system.
In the case that the combustion does not start in this first
operation, the heating device must be shut off and started
once again.