Electrical Connections - Webasto Thermo 50 Instructions De Montage

Thermo50_02_gb_g.fm Seite 44 Dienstag, 27. Mai 2003 12:08 12

Electrical connections

10 Electrical connections
10.1. Connection of control unit / heater
The electrical connection of the heaters is made as shown in
Figs. 17 to 22.
10.2. Connecting the controls
The heater can be switched on and off using the following Webasto
controls:
– Timer see circuit diagram Fig. 17.
– Switch see circuit diagram Fig. 18.
10.3. Connection when installing Thermo 50 in a hazchem vehicle
(ADR)
The electrical connection is made as shown in the circuit diagram,
Figs. 19 to 22.
NOTE:
The switch of the auxiliary power take-off must be installed in such a way
that either a positive or a negative potential is connected to input X14 of
the control unit when a pumping device is switched on.
IMPORTANT:
All ADR functions are ineffective if there is no earth at control unit input
X14 when the system is switched on. The control unit continues to run
briefly for 20 seconds and then switches to "fault lock-out" operating
mode when a positive voltage is connected to control unit input X14
(auxiliary power take-off on).
In accordance with the technical specifications of the act governing the
road haulage of hazardous materials, heaters are only allowed to be
taken into service with a special manually operated switch fitted in the
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cab. If the system is equipped with a standard clock, ensure that
contact 4 on the standard clock remains free. The heater can then only
be taken into service using the immediate heat button (circuit diagram
available on request).
The use of other timers in ADR vehicles is not permitted.
10.4. Vehicle fan
The vehicle's own heater fan is controlled using a relay, see circuit
diagram Figs. 17 to 22, or using a relay with a cabin thermostat.
Thermo 50