Kromschroder Burner control unit BCU370WI2FEU0D3 88600204

This burner control unit controls, ignites and monitors industrial forced draught burners of unlimited capacity in intermittent or continuous operation. It is designed for gas firing and operates from a 230 V supply. Flame detection can be by ionisation or UV sensor, with a maximum sensor cable length of 50 m. The unit has an integrated tightness control with a test period of 10 s, a pre-purge time of 20 s, pre-ignition time of 3 s, and a safety time of 1 s. It provides up to 4 burner start-up attempts and has a switch-off threshold of 1 µA. The housing is IP54 rated, made of impact-resistant and heat-resistant plastic, and weighs 1.8 kg.

Burner control units of this type are selected by matching the mains voltage, operation mode (intermittent or continuous), and flame detection method (ionisation or UV) to the burner and its fuel type. The unit requires connection to an external air pressure switch for pre-purge and operation monitoring. Cable routing must respect maximum lengths: ignition cables to 1 m, and ionisation or UV sensor cables to 50 m. Installation requires accessible terminal connections and earthing to the equipment frame; the spacious wiring chamber accommodates standard industrial wiring practices.

Typical failure modes include loss of flame signal, failure to ignite, or lockout after repeated start-up attempts. When the unit locks out, the burner shuts down and the fault is indicated on the display; the unit may attempt up to 4 start-ups before locking out. Check the flame detector (ionisation or UV) and its cable, the air pressure switch and its monitoring during pre-purge and operation, and the gas pressure monitoring. A flame failure during operation triggers a burner restart. Verify the supply voltage and the wiring in the lower section, and confirm the tightness control and fan run-up are functioning.