Installation; Installation Location/Installation Position Of The Heater And Control Unit; Installing Heater; Installing Control Unit - Webasto Thermo 90 ST WDT Installation Instructions Manual

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Installation

The water heater must be installed outside the passenger cabin.
If the vehicle manufacturer has issued instructions, they must be
followed.
3.1. Installation location/installation position of the heater and
control unit
Body sections and any other components in the vicinity of the heater must
be protected from excessive heat and the possibility of fuel or oil
contamination.
(Requirement from ECE-R 122, Point 5.3.2.1.).
The heater shall not constitute a risk of fire, even in the case of overheating.
This requirement shall be deemed to be met if the installation ensures an
adequate distance to all parts and suitable ventilation, by the use of fire
resistant materials or by the use of heat shields.
(Requirement from ECE-R 122, Point 5.3.2.2.).
Installation should be carried out as low as possible to ensure automatic
bleeding of the heater and circulation pump. This is particularly important
as the circulation pump is not self-priming.
The heater may not be installed:
– in the direct area of radiation of exhaust systems
– below the wading line of the vehicle.
– above the coolant expansion tank.
Technical Information
Fig. 1 Permissible installation positions for Thermo 90 ST WDT
3.2.

Installing heater

Every reasonable precaution should be taken in positioning the heater to
minimize the risk of injury and damage to personal property.
(Requirement from ECE-R 122, Point 5.3.2.5.).
The heater must be secured on the bracket with at least 3x M8 bolts with
18 Nm.
3.3.

Installing control unit

The control unit must be secured with at least 4x M6 nuts with 8 Nm. The
installation position can be selected as desired, however the permissible
protection type must be observed! A suitable connection between the eart-
hing pins and the vehicle earth must be provided to ensure EMC protection.
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