Controlled via external 0..10VDC signal.
PTC – electronic protection from insufficient airflow. The heater is only allowed to work if the airflow velocity is 1,5m/s or higher.
PS – mechanical protection against loss or insufficient airflow with differential pressure switch. The heater if not allowed to heat unless a minimum airflow of 1,5m/s is reached.
By ordering the PS, an internal contactor for power supply is added to the heater as well.
Upon request internal contactor for power supply can be added in the heater.