Honeywell TFI 812.2 mod. 5 is a gas burner control box capable of controlling and monitoring 2‑stage atmospheric gas burners. It supports ionisation probe or infrared flicker flame detection, features a fail‑safe under‑voltage shutdown to prevent unsafe restart, includes a pre‑ignition time of approximately 15 sec and a nominal safety interval of 5 sec. It complies with DIN 4788 Part 3, EN 298 and is also usable in stationary warm‑air generators per DIN 4794.
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