Webasto Thermo 350 Service Manual download pdf (Page 20)

Thermo 230/231/300/301/350 Connection to the vehicle cooling system

6 Connection to the vehicle cooling system

The heater is connected to the vehicle cooling system as shown in Figu-

res 1, 2, 5 and 10. The system must contain at least 10 litres of coolant.

A minimum of 20% of a good quality antifreeze should be maintained in

the heating circuit of the heater at all times.

The water hoses supplied by Webasto must always be used. If you do

not use these hoses, the hoses that you do use must comply with DIN

73411. The hoses must be installed without kinks

and (to ensure perfect

bleeding of the heater) rising if possible. Hose connections must be

supported by hose clips to prevent them slipping.

NOTE:

The specified tightening torques of the hose clamps used must be

complied with.

Only pressure valves with an opening pressure of min. 0.4 bar and max.

2.0 bar may be used in the vehicle’s cooling system or in a separate

heating system.

The cooling system must be bled carefully before using the heater for

the first time or after replacing the coolant. The heater and lines should

be installed in such a way as to ensure static bleeding.

Perfect ventilation can be identified by the circulating pump operating

almost silently. Poor bleeding may cause the resetting temperature

limiter to trip whilst the heater is operating.

When using circulating pump U 4851, approximately 15 seconds after

switch-on the circulating pump is automatically switched off when there

is a lack of coolant or the pump impeller is obstructed; it may be

restarted after approximately 2 minutes.

When using Aquavent 6000 S circulating pump, approximately 45

seconds after switch-on the circulating pump is automatically switched

off when there is a lack of coolant or the pump impeller is obstructed; it

may be restarted after approximately 2 minutes.

Also in the case of Thermo 230/231/300/301/350 heaters featuring

control unit SG 1572 D in combination with a programmed check of the

circulating pump, will the heater be switched off when there is a lack of

coolant.

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Webasto Thermo 350 Service Manual Page 20