Honeywell Automatic gas firing device DKW 972-N mod.05 0422005

The Honeywell DKW 972-N mod.05 is an automatic gas firing device designed for diesel burners on air heaters and for burners with a capacity above 30 kg/h. It supports intermittent operation, with or without heating liquid fuel, and is suitable for 1- or 2-stage burners. The device provides restart and subsequent ventilation after flame disappearance, with a ventilation time of 60 seconds. It can be used with a photoresistor (MZ 770 S), an infrared sensor (IRD 1010.1), or a UV sensor (UVD 970). The unit weighs 190 g including base, has protection class IP40, and can be installed in any position.

Parts of this type are selected by matching the control box to the burner's specifications, including the flame sensor type (photoresistor, infrared, or UV) and the required ventilation time. The installation position is flexible, but the flame sensor cable length must not exceed 2 meters. Ensure the control box is compatible with the burner's capacity and operational mode (intermittent, 1- or 2-stage).

Common failure modes for this kind of device include failure to ignite, flame loss during operation, or inability to restart after a flame failure. Symptoms may include the burner not starting, frequent shutdowns, or prolonged ventilation cycles. Check the flame sensor and its cable for damage or disconnection, and verify that the control box receives proper power and signals.