IRD820 - obsolete, no alternative ;Infrared Flicker Detector ZT930 ZT 930 24V DC TF 801 (013.31030), Öl-Gebläsebrenner FR 870 (013.31097), riegelung (-störung) MZ 770 S MZ 770 S MZ770S MMG 810.1 Mod.43 TFI 812.2 MOD.10 DKG-972 Mod.03 obsolete, replacement DKG 972-N Mod. 03; DMG-970 Mod. 02 MMI-810.1 Mod.03 DKG 972-N Mod. 03 Tmg740-2 obsolete, replacement TMG740-3 MOD. 32-32;Burner controller MMG 810.1 Mod. 33 (013.31345)