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Connection to the Vehicle's Cooling System
The heater is to be connected to the vehicle's cooling sys-
tem in accordance with Figs 3, 4, 5 and 6. A minimum of 4
litres of coolant must be maintained in the cooling circuit.
2
4
1
3
7
Fig 5:
Integration into Engine/Water
Circuit "Inline Integration"
1
2
9
3
7
4
8
Fig 6:
Integration into Engine/Water
Circuit "Thermostat Integration"
Legend of Figs. 5 and 6:
1 Expansion tank
2 Thermostat
3 Vehicle engine
4 Circulating pump
5 Heating device
6 Heat exchanger of heater
7 Radiator
8 Thermostat
9 Non-return valve
The integration of the heater into the cooling circuit is to be
performed in the flow line of the vehicle's heat exchanger.
As a rule, the water hoses supplied by Webasto with the
heater should be used. If this is not the case, the hoses
must comply with DIN 73411 requirements as a minimum.
The hoses are to be routed
ensure proper venting – in an upward pitch, if
5
possible. Hose connections must be secured against
slipping off by means of hose clamps.
NOTE:
When securing the hose clamps to the heater, be sure to
fit them between the bead (thicker part) of the hose and
6
the heater.
The hose clamps must be tightened to a torque of 2.0 +
0.5 Nm.
Before the heater is started up for the first time, or after the
coolant has been replaced, it must be ensured that the
cooling system is properly bled. Heater and piping should
be installed in such a way that static bleeding of the sys-
tem is ensured.
5
During heating operation, inadequate bleeding may lead to
a malfunction due to overheating.
6
Re-Positioning of Circulating Pump
The circulating pump may be integrated into the water cir-
cuit either by installation at the location provided on the
heater or at a heater-remote location.
It is important that the correct direction of flow through the
heater be observed (water outlet at top / water inlet at
bottom) as otherwise malfunctions will occur!
Connection to the Fuel System
Fuel system integration without non-return valve
in the tank
The heater's fuel supply circuit must be integrated in the re-
turn line as shown in Fig. 3.
without any kinks and – to
Fuel system integration with non-return valve in the
tank or fuel system integration in the case of single-
line fuel supply
Tank extractor with 90°-elbow is to be installed in the tank
fitting (Fig. 7)
Bild 7:
Bild 8:
BBW 46 / DBW 46
5
8,5
500
Tankarmatur 90°
Lochbild
Mindestabstand 25 mm
Webasto-Tankentnehmer
5
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