Brahma Microprocessor-based control unit NDE31 37555003

The Brahma NDE31 (SKU 37555003) is a microprocessor-based control unit for automatic ignition, flame monitoring, and safe operation of forced-draught burners. It operates in intermittent mode with a fixed pre-purge time of 15 seconds and a safety time of 5 seconds. The unit supports gas or liquid fuel (diesel, oil) and is suitable for two-stage and progressive burners. It works with an ionisation electrode or photodiode FD for flame detection. Supply voltage is 220–240 V, protection class is IP40, and dimensions are 10.7 x 8.1 x 3.6 cm. Operating temperature range is -20 to 70 °C.

Control boxes of this type are selected by matching supply voltage, safety time, pre-purge time, flame detector type, and burner stage compatibility. Ensure the mounting dimensions and protection class fit the intended enclosure. Verify the fuel type and operating mode (intermittent) align with the burner's requirements. Compare the existing unit's model and specifications before ordering.

Typical failures include loss of flame detection, lockout due to ignition failure, or malfunction of the internal relay. Symptoms may include the burner failing to start, repeated lockouts, or erratic operation. Check the flame detector, wiring, and supply voltage, and inspect for visible damage or overheating.