Brahma 37500020 NDM11PR control box

Brahma NDM11PR burner control unit (art. 37500020) is a microprocessor burner management unit for automatic ignition and flame monitoring in atmospheric progressive burners operating on gas or liquid fuel in intermittent mode. The device combines all necessary functions in a compact housing: pre‑purge, ignition, flame monitoring and safety lockout. The NDM11PR model is ideally suited for burners that require a fixed ventilation time before ignition and is widely used in domestic and small industrial heating systems. Main technical specifications Parameter Value Supply voltage 220–240 V, 50/60 Hz Flame control Ionisation electrode or photodiode FD Burner type Atmospheric, progressive Fuel type Gas, liquid fuel Operating mode Intermittent Pre‑purge time 30 seconds Safety time (Ts) 3 seconds Operating temperature –20 °C to +70 °C Protection class IP40 Dimensions (H×W×D) 10.7 × 8.1 × 3.6 cm Key features Built‑in high‑voltage ignition transformer – no external unit required, simplifies installation. Microprocessor control with self‑diagnosis and LED indication of operating modes and fault codes. 30‑second pre‑purge – removes residual fuel from the combustion chamber before ignition. Universal flame control – ionisation (gas) or photodiode FD (liquid fuel). Safety lockout – on flame loss or ignition failure, the unit goes into emergency mode; reset by briefly interrupting power or by a button (if available). Protection against interference and voltage surges – built‑in EMC filter and varistor. Compact IP40 housing – protection against dust and splashes, convenient for mounting on a DIN rail or inside equipment. Applications Atmospheric progressive gas and oil burners Domestic heating boilers Water heaters and convectors Hot air guns and infrared heaters Baking ovens and drying chambers Order codes 37500020, 246.124.245