Connecting The Controls - Webasto Thermo 90 ST B Installation Manual

Thermo 90 ST

11.2 Connecting the Controls

The heater can be switched on and off using the following Webasto controls:
• Switch, see circuit diagrams in Figures 30 and 32.
• Timer, see circuit diagrams in Figures 31 and 33.
Figure 30: Toggle switch
Connector X2 (Violet)
For truck operation, connect to red
jumper of heater control harness.
For Coach, Transit and School Bus
operation, connect to ignition source.
Figure 31: 7-Day, 3 Program Comfort Timer model 1531
All the cables and wires that are not required must be insulated against accidental
CAUTION
shorting or grounding.
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1
2
4
3
CONNECTOR X1
1
X3
5
(MATING END SHOWN)
Heater Control Harness Connection
Using a 12 or 24 Volt Switch
1. White (Ground)
2. Red (Power)
3. Black (On signal)
4. Green (Operation indication)
Heater Control Harness Connection
Using 1531 Comfort Timer
2 3 4
6 7 8
X1
X2
25
Electrical Connections
1. Red (Power)
2. Not Used
3. Green (Operation indication)
4. Optional (Dash lights)
5. White (Ground)
6. Black (On signal)
Webasto Product N.A., Inc.