The Honeywell (Satronic) TFI 812.2 is a control box designed for safe operation and flame monitoring of two‑stage atmospheric gas burners. It features voltage‑drop fail‑safe shutdown to prevent fault‑triggered restarts and supports both ionization probe and infrared flicker flame detection systems.

Key Features and Technical Specifications:

• Standards: Complies with DIN 4788 Part 3 (04.89), EN 298; suitable for stationary warm air generators per DIN 4794

• Flame Detection: Supports ionisation probe and infrared flicker detectors

• Fail‑Safe Function: Voltage‑drop shutdown prevents unsafe restart after supply drops

• Housing: Flame-retardant, transparent plug-in plastic with thermo-mechanical timing and reset device

• Variants:

Mod. 5 (02601U): Pre‑ignition ≈ 15 s; nominal safety interval 5 s
Mod. 10 (02602U): Pre‑ignition ≈ 10 s; nominal safety interval 10 s

• Electrical Specs:
Supply: 220–240 V, 50 Hz (40–60 Hz)
Power consumption: 5 VA
Fuse: 10 A fast or 6 A slow
Output: Max 4 A per terminal; total max 6 A

• Timing Features:
2nd-stage delay approx. 20 s
Reset delay after lockout approx. 60 s

• Operating Conditions:
Ambient: –20 °C to +60 °C
Sensitivity: 1.5 µA; min ionization current 2–3 µA

Honeywell (Satronic) – TFI 812.2 – Gas-Burner Control Box