Webasto Thermo Top Evo - B, Installation Instructions Manual

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Coolant circuit
24
7 Integration in coolant system
7.1. Connection
The heater is connected to the vehicle cooling system as shown in Fig. 4, 6
and 7. The coolant quantity present must at least be equivalent to the vol-
ume specified in Kapitel 15, "Technical data".
Legend fig. 4:
1) Radiator
4) Internal combustion engine
7) Circulation pump
10) Water heater
14) Heat exchanger for vehicle heater
28) Expansion tank
29) Thermostat
It is preferable to integrate the heater in the coolant system at the heat ex-
changer inlet.
Any coolant running off should be collected using an appropri-
ate container.
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.
Only hoses with an inside diameter of 18 mm may be chosen.
Hose connections must be secured against slipping off with clips.
7.2. Installing coolant connection pieces
Never mount the retaining plate and the water connection
pieces when the heater has been installed.
The contact surfaces of the O-rings in the heat exchanger must be clean
and must not have any damage.
The O-rings must be wetted with water before being mounted in the heat
exchanger.
Lay the O-rings in the openings of the heat exchanger. Mount the water
connection pieces in the retaining plate. Move the connection pieces into
the required installation position.
Fasten the retaining plate with the coolant connection pieces on the heat
exchanger. DG 5X15 mm self-tapping screw, torque 7 Nm.
To ensure the self-bleeding of the heater, the water-outlet connection piece
must be positioned pointing 0° to 90° upward if possible.
See fig. 8: Installing water connection pieces.
Ensure proper positioning of the sensor cable!
See fig. 5: Position of sensor cable.