BBW - DBW 46 - VW-Bus-T4.de

BBW 46 / DBW 46
Connection to the Vehicle’s Cooling System
The heater is to be connected to the vehicle’s cooling system
in accordance with Figs 3, 4, 5 and 6. A minimum of 4
litres of coolant must be maintained in the cooling circuit.
7
1 2 3 4 5
6
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 without any kinks and – to
ensure proper venting – in an upward pitch, if
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
the heater.
The hose clamps must be tightened to a torque of 2.0 +
0.5 Nm.
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 return
line as shown in Fig. 3.
Fuel system integration with non-return valve in the
tank or fuel system integration in the case of singleline
fuel supply
Tank extractor with 90°-elbow is to be installed in the tank
fitting (Fig. 7)
5
Fig 5:
7
1
Integration into Engine/Water
Circuit “Inline Integration”
2
3
8
4
9
5
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 system
is ensured.
During heating operation, inadequate bleeding may lead to
a malfunction due to overheating.
8,5
500
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
6
Re-Positioning of Circulating Pump
The circulating pump may be integrated into the water circuit
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!
Bild 7: Tankarmatur 90°
Lochbild
Mindestabstand 25 mm
Bild 8: Webasto-Tankentnehmer
5