Installing Coolant Hoses; Installing Circulation Pump; Checking - Webasto Thermo Top Evo Installation Instructions Manual

Coolant circuit
7.3.

Installing coolant hoses

Ensure the correct direction of flow of the coolant when integrating the
coolant hoses in the coolant circuit. To simplify installation, the coolant
hoses, the water inlet and outlet on the heater and the circulation pump are
marked with white arrow markings.
The clamps on the heat exchanger fittings must be mounted between 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 upward via the
connection piece. Incorrect installation can result in malfunctions of the
circulation pump.
See Fig. 7: U4847 Econ circulation pump.
7
Also see chapter 11.2, "Connecting 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 pressure
specified by the vehicle manufacturer.