Brahma Burner management unit (burner control unit) CM11F 37100204

Brahma CM11F is an electronic burner management unit for automatic control of two-stage atmospheric gas burners in intermittent operation. It operates on 220–240 V AC and features a safety time of 5 seconds and a pre-purge time of 1.5 seconds. Flame monitoring is via ionisation, with a reaction time of less than 1 second on flame loss. The unit has a manual lockout reset, weighs 0.17 kg, and measures 107 x 81 x 36 mm. It is rated IP00 and can be installed in any position. Suitable for gas burners with or without a fan, it fits models such as Master and Oklima BV70, BV110, BV170, BV290, B230, and B360.

Parts of this type are selected by matching the supply voltage, safety time, pre-purge time, flame detection method, and burner stage configuration. The unit must be compatible with the burner's control circuit and mounting base. Installation requires a separate base (not included) and proper wiring polarity. The protection class IP00 necessitates installation inside a protective enclosure. Ensure the connector type (e.g., Molex) matches the existing harness.

Typical failures include failure to ignite, lockout after safety time, or immediate shutdown on flame loss. The equipment may show no response or repeated lockouts requiring manual reset. Check the ionisation electrode for contamination or damage, verify wiring connections, and ensure the supply voltage is within specified range. A faulty unit may also cause intermittent operation or failure to switch between stages.