TBI-10
Potentiometer mounted on the main board panel for setting temperature between -20 and +10ºC.
Used with the controller and a TG-K310 duct sensor to set the minimum air temperature beforeentering in the heat exchanger.

TBI-30
Potentiometer mounted on the main board panel for setting temperature between 0 and +30ºC. Used with the controller and with a TG-K330 duct sensor to set the air temperature after the electric heater in post heating operation.