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WEBASTO DBW SERIES HEATERS OPERATING INSTRUCTIONS
Timer Operation Modes (Model CDN-1224)
Truck or Bus Operation
By flipping one of the dip switches on the back of the unit, the timer can be set for either truck or bus operation. The
tables shown below illustrates the timing sequence associated with operation in either of these modes.
Bus Application
Ignition wire is connected to ignition source and dip switch #3 is in bus mode.
Whether the heater is turned on manually or automatically, it will stay on until the timer duration ends. Except, when
the heater is turned on manually while the bus is running (ignition key turned on), the heater will shut off when the
ignition key is turned off, or the heater on/off button is pressed.
Truck Application for Preheat Mode Only
Ignition wire is disconnected and dip switch #3 is in truck mode.
Pre-set Mode Heater on Timer duration ends Heater turns off after time duration ends
Manual Mode Heater on Timer duration ends Heater turns off after time duration ends
Truck Application for Preheat and Sleeping Modes
Ignition wire is connected to constant (battery) power source and dip switch #3 is in truck mode.
Pre-set Mode Heater on Timer duration ends Heater turns off after time duration ends
Manual Mode Heater on Unlimited duration Heater stays on until turned off manually
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