Connection To The Vehicle Cooling System - Webasto Thermo 50 Installation Instructions Manual

Thermo 50
6

Connection to the vehicle cooling system

In thermostat circuits, only use thermostats which start to open at < 70 °C.
The heater is connected to the vehicle cooling system as shown in
Figs. 4 and 5. At least 4 litres of coolant must be circulated.
NOTE:
Leaking coolant must be collected in a suitable container.
The water hoses supplied by Webasto must always be used. If other
hoses are used, they must at least comply with DIN 73411. The hoses
must be routed without kinking and preferably uphill to ensure perfect
bleeding. Hose connections must be supported by hose clips so they
cannot slip off.
NOTE:
The hose clips on the heater must be fitted between the flared neck and
the heater.
The hose clips must be tightened with a torque of 2.0 + 0.5 Nm.
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.
Connection to the vehicle cooling system
6.1. Relocating the circulation pump
The circulation pump can be installed either in its intended position on
the heater or separately from the heater, in the water circuit.
Care must be taken to ensure without fail that water flows through the
heater in the right direction (water outlet at the top / water inlet at the
bottom), otherwise the heater will malfunction.
Fig. 6: Circulation pump U4847
Installation positions
37