When a fan system is used to extract heat from a heat exchanger which in turn is heated by a thermo top.
In this way, when the heating is activated and a temperature is selected, the system will activate the output of pin 5 and 6 of block 28 to energize a relay to start the fans.
The temperature reading will be taken by the vehicle’s interior probe and it will decide when to turn the heating fan on or off.
The system will automatically start the boiler if the user turns on the heat, as well as, it will warn the user when he/she tries to turn off the boiler with the heat on.
Go to “Professional Settings” and select:
Boiler model: WEBASTO THERMO TOP Heating model:
WEBASTO THERMO TOP AIR