Webasto Air Top 3500 ST Installation Instructions Manual - page 24
Electrical connections
Air Top 3500 ST / Air Top 5000 ST
56
11
Electrical connections
All lines that are not required must be insulated at their free end.
NOTE:
If the combination or standard timer is used, a touch-sensitive switch
may be installed in the sleeping section to act as a remote control and
improved convenience. The connections must be made as shown in the
circuit diagrams in Figures 32 and 33.
The electrical connection is made as shown in the system circuit
diagram (Figures 31, 32, 33 and 34).
11.1. Connection for installing the heater in a hazchem vehicle
(ADR)
To install the Air Top 3500 ST D and Air Top 5000 ST D heaters in
hazchem 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 in Figure 34.
NOTE:
The switch S3 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.
IMPORTANT
All ADR functions are ineffective if there is no earth at control unit input
X6/1 when the system is switched on. The control unit continues to run
briefly for a maximum of 40 seconds and then switches to "fault lock-out"
operating mode when a positive voltage is connected to control unit
input X6/1 (auxiliary power take-off on) or the engine is switched off.
IMPORTANT
In accordance with the regulations of the act governing the road/rail
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 combination timer, ensure that contact
4 on the combination timer remains free. The heater can then only be
taken into service using the immediate heat button. The use of other
timers in ADR vehicles is not permitted.
11.2. Heater connection
To connect the wiring harness, remove the control unit cover on the
heater and connected the wiring harness plug to the control unit.
NOTE:
Raise the control unit cover on both sides using a blunt blade
(Figure 24 arrows).
Before using the heater for the first time fit the control unit cover to
prevent the illegal escape of hot air (heater overheating).
Fig. 24: To remove the control unit cover