Webasto Thermo 230 Instructions De Montage page 55

Th23_EA_degbfr_g.book Seite 51 Dienstag, 15. Februar 2005 2:03 14
Thermo 230/231/300/301/350
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
All manuals and user guides at all-guides.com
Connection to the vehicle cooling system
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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