Resideo automatic oil burner control for 1-stage oil burners. Undervoltage-proof. Monitoring via MZ 770 S or IRD 1010. Replacement for TF 801, TF 830, TF 830.1, TF 830.2. If a flame sensor FZ 711 is still installed, it must be replaced with MZ770! Replaces Satronic / Honeywell.