Webasto Thermo 90 ST Installation Instructions Manual - page 20
Thermo 90 S / Thermo 90 ST
Electrical connections
49
9
Electrical connections
9.1.
Control module / heater connection
The electrical connection of the heaters is made as shown in the circuit
diagrams in Figures 15, 16, 17, 18, 19, 20, 21 and 22.
9.2.
Connection when installing Thermo 90 S-ADR
and Thermo 90 ST-ADR in a hazchem vehicle (ADR)
To install the Thermo 90 S-ADR and Thermo 90 ST-ADR heaters in haz-
chem vehicles, the requirements of ADR/RID part 9 para. 9.2.4.7 –
Combustion heating systems, must also be satisfied. The electrical
connection is made as shown in the circuit diagram, Figs. 17, 18, 21
NOTE:
The switch S7 must be installed in such a way that a positive potential
is connected to appropriate input of the control module when a pumping
device is switched on.
If there is no earth via Y2 or H5 at control module input X12/5
(Thermo 90 S) or X8/5 (Thermo 90 ST) when it is switched on, all the
ADR functions are disabled.
After activating the positive potential at control module input X12/5
(Thermo 90 S) or X8/5 (Thermo 90 ST) (auxiliary power take-off on) a
brief run-on time of 20 seconds on the Thermo 90 S (40 seconds on the
Thermo 90 ST) will take place, following which the control module will be
in “Fault lock-out” mode.
IMPORTANT
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
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.
9.3.
Connecting the controls
The heater can be switched on and off using the following Webasto
controls:
– Timer, see circuit diagrams in Figures 15, 16, 19 or 20.
– Switch, see circuit diagrams in Figures 17, 18, 21 or 22.
9.4.
Vehicle fan
The vehicle's own heater fan is controlled using a relay, see circuit
diagram Figs. 15, 16, 17, 18, 19, 20, 21, 22 or using a relay with a cabin
thermostat.
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