Coolant circuit
24
7 Integration in Coolant System
7.1. Connection
The heater is connected to the vehicle cooling system as shown in fig. 5, 6
and 7. The coolant quantity present must at least be equivalent to the vol-
ume specified in chapter 15, "Technical Data".
It is preferable to integrate the heater in the coolant system at the heat ex-
changer inlet.
Legend fig. 5:
1) Radiator
4) Internal combustion engine
7) Circulation pump
10) Water heater
14) Heat exchanger for vehicle heater
28) Expansion tank
29) Thermostat
The coolant hoses supplied by Webasto must always be used. If other hoses
are used, they must at least comply with the standard DIN 73411, material
class B. The hoses must be routed without kinking
and preferably uphill
from the heater to ensure perfect bleeding.
Hoses with an internal diameter of 20 mm must be used.
Hose connections must be secured against slipping off with clips.
7.2. Installing coolant hoses
The clamps on the coolant 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 the clamps approved by Webasto may be used to secure
the coolant hoses.
The hose clamps must be tightened with a tightening torque of
2.0 + 0.5 Nm.
7.3. Retrofitting or detaching circulation pump
The circulation pump can be integrated in the coolant circuit both at the
location provided on the heater or detached from the heater.
The circulation pump must be installed in the coolant circuit on the pres-
sure side on the heater heat-exchanger inlet (see fig.5).
Any coolant running off should be collected using an appropri-
ate container.
1317098B_EA_TT_ZEC_DE_EN_ZH.book Page 24 Tuesday, July 3, 2012 1:08 PM
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