Brahma Burner control unit CM31 30179535

The Brahma CM31 is a microprocessor-based burner control unit for atmospheric gas burners with forced draft, operating in intermittent mode. It features a non-volatile lockout with manual reset, an ionisation flame detector with a reaction time of less than 1 second, and a safety time of 10 seconds. The pre-purge time is 1.5 seconds, and it operates at a supply voltage of 230 V. It is certified to CE, EN298:1993, and EN298:2003, and is designed for progressive (modulating) gas burners.

Parts of this type are selected by matching the supply voltage, safety time, pre-purge time, flame detection method, and burner stage type. The control unit must be compatible with the burner's fuel type and air supply configuration. Installation involves connecting the unit to the burner's wiring, ensuring the flame detector is properly positioned, and verifying that the reset mechanism is accessible. Always compare the model and specifications with the original unit before ordering.

Common failure modes for this kind of control unit include failure to start, lockout without obvious cause, or intermittent shutdowns. When the unit fails, the burner may not ignite, or it may shut down during operation, often indicated by a red LED. Check the flame detector for contamination or damage, verify the wiring connections, and ensure the gas supply is adequate. If the unit locks out, it requires a manual reset after addressing the underlying issue.