Webasto DBW 46 Wartungshandbuch PDF herunterladen (Seite 19)

8 Servicin

BBW 46 / DBW 46

802

8.6 Visual Inspections and

Installation Re

ulations

8.6.1 Connection to the Vehicle Cooling

System

The installation location of the heater should be as low as

possible to ensure self-venting of the heater and

circulation pump. This applies in particular to the

circulation pump, which is not self-sucking.

The heater is to be connected to the vehicle cooling

system according to Fig. 801 or 802. The amount of

coolant used in the circuit must be at least 4 litres.

The coolant hoses supplied by Webasto must be installed,

other hoses must meet at least the DIN 73411

requirement. The hoses are to be routed upwards and

without kinks to ensure proper venting. Hose connections

must be protected against slippage using hose clamps.

NOTE

The hose clamps are to be torque-tightened with 1.5 Nm

(hose clamps previously used) or with 5 Nm (new, wide

hose clamps).

Old New

After replacing the coolant ensure that the cooling system

is bled thoroughly. The heater and hoses must be

installed so that a static venting is guaranteed.

Insufficient venting may cause malfunctions during

operation by overheating.

Proper venting may be verified by a circulation pump

operating almost noiseless. During operation improper

venting may cause a response of the resettable

temperature limiter or of the temperature fuse.

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Webasto DBW 46 Wartungshandbuch Seite 19