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Coolant circuit
Legend Fig. 5:
21) Heat exchanger inlet
22) Heat exchanger outlet
30) Sensor cable
7.3.
Installing coolant hoses
The clamps on the heat-exchanger connection pieces must be mounted be-
tween the bead and the hose shoulder.
Care must be taken to bleed the cooling system before the heater is taken
into service for the first time or after refilling with fresh coolant. Heater and
lines should be installed in such a way as to ensure static bleeding.
Malfunctions due to overheating may occur during operation if the heater
and lines have not been bled correctly.
Only spring band clamps approved by Webasto may be used for
the installation of the coolant hoses.
7.4.
Installing circulation pump
The circulation pump must be installed in the coolant circuit on the pressure
side on the heater heat-exchanger inlet (see fig. 4).
Ensure the correct direction of flow of the circulation pump to the vehicle
coolant circuit. The installation position of the circulation pump must be
chosen so that the circulation pump is self-bleeding. It must be possible for
the air volume trapped in the circulation pump to automatically escape up-
ward via the connection piece. Incorrect installation can result in malfunc-
tions of the circulation pump.
See fig. 7: Installation positions of U4847 Econ circulation pump.
7.5.
Checking
After the heater and all coolant-carrying components have been installed,
the entire coolant system must be checked for leaks with the system pres-
sure specified by the vehicle manufacturer.
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