Brahma 37056010 CM31U control box

Brahma CM31U is a fully solid‑state microprocessor controller (“burner control unit”) designed for automation, monitoring and safety of atmospheric gas burners of progressive (modulating) type. It works equally effectively with or without a fan. Purpose and applications Brahma CM31U is a key component for a wide range of heat‑generating equipment, including: Gas and combination boilers for domestic and industrial use. Hot air guns (including popular Master, OKLIMA models) and warm air generators. Infrared (IR) heaters, air heaters and radiant tube heaters. Water heaters, industrial and domestic furnaces, as well as cookers. The controller is suitable for burners from leading brands such as Riello, Baltur, Immergas, Weishaupt and many others. Main functions and features Non‑volatile lockout with manual reset (Manual Reset): This is the main feature of the CM series, providing the highest safety class. In any abnormal situation (e.g., no flame) the device automatically locks out. To restart, the Reset button on the housing must be pressed manually after the cause has been eliminated. This eliminates the risk of unintentional burner start‑up. Instant ionisation flame monitoring: Flame detection is based on the rectifying properties of the flame. Response time on flame loss is less than 1 second, guaranteeing instantaneous gas shut‑off. Two independent safety contacts: A critically important safety feature. The gas valve output is equipped with two independent contacts connected in series. This redundancy ensures backup and eliminates the possibility of gas leakage if one of them fails. High reliability and service life: The robust construction ensures more than 250,000 operating cycles, guaranteeing durability even under intensive conditions. Built‑in powerful high‑voltage ignition transformer: Provides stable and reliable ignition of the fuel‑air mixture without the need to purchase and install an additional external ignition unit. Auxiliary contact: Designed for systems with intermittent power supply, for example low‑power ignition or control of the main gas valve. Important: This contact is not isolated from the main supply voltage by reinforced insulation, therefore it is not suitable for controlling extra‑low voltage (SELV) circuits. Built‑in electronic protection: A built‑in varistor and fuse protect the device against voltage surges and short circuits on outputs (valves, fan, lockout signal). Impact‑resistant housing: Made of non‑flammable plastic, effectively protecting the internal electronics from dust, dirt and mechanical damage. Compliance with international standards: Fully complies with European safety standards EN298:1993 and EN298:2003 for burner control systems and has CE certification. Technical specifications Parameter Value Model Brahma CM31U Article numbers 37056010, 246.124.067 Rated supply voltage 230 V AC, 50/60 Hz (110‑120 V version available on request) Power consumption 9 VA Pre‑purge time (tv/tp) 1.5 seconds Safety time (ts) 10 seconds Waiting time (tw) 1.5 seconds Response time on flame loss 250,000 operations Important: Protection class IP00 means the device has no built‑in protection against dust or moisture. To ensure reliable and safe operation, it must be installed inside a protective control cabinet with a minimum protection rating of IP20. Compatibility and replacement Compatible burners: Brahma CM31U is suitable for a wide range of progressive atmospheric gas burners with a fan, as well as for burners without a fan. Direct replacement: Article numbers 37056010 and 246.124.067 are identical and fully interchangeable. Accessories: A Microflat‑type connection base is required (purchased separately). The connection diagram is printed on the device housing. Cables for connection are included in the package. Installation and operation Mounting: The device can be mounted in any position. Due to IP00 protection class, it is strongly recommended to install the unit in dry, well‑ventilated locations, always inside a protective enclosure/control cabinet that prevents dust and moisture ingress. Wiring: Always disconnect power before starting work! Strictly follow the correct connection of live and neutral wires, as well as gas valve control and flame sensor circuits according to the diagram on the housing. External protection: It is recommended to additionally protect the unit with an external fast‑acting fuse (the internal fuse is not replaceable). Initial start‑up: Before start‑up, ensure the combustion chamber has been purged, the ionisation electrode is correctly positioned and provides a stable signal current (recommended >5 µA for reliable operation). Lockout reset: When a safety lockout occurs (controller stops starting the burner, red LED lit), find and eliminate the cause (e.g., check gas supply, electrode condition, etc.), then manually press the Reset button on the housing. Maintenance: Periodically check the condition of contacts, wiring integrity, and the cleanliness and position of the ionisation electrode. Contamination or wear of the flame sensor can lead to false trips. Operating mode: The unit is designed for intermittent operation. To maximise service life and safety, the system must be forced to stop at least once every 24 hours to perform the built‑in self‑diagnosis. Advantages over alternatives Highest safety level: Manual reset (non‑volatile lockout), two independent safety contacts, instant flame monitoring ( 250,000 cycles and built‑in protection against voltage fluctuations. Economy and comfort: Progressive (modulating) power control optimises fuel consumption and reduces the number of burner starts/stops. Easy integration: Compact dimensions and standard interfaces simplify installation and replacement. Package contents Brahma CM31U burner control unit (art. 37056010) – 1 pc. Cable set for connection – 1 set. Quick installation and operation guide – 1 pc. Note: The connection base is purchased separately. Storage conditions and warranty Warranty period: Typically 6‑12 months from the date of sale (please check with the seller) provided that installation and operating rules are followed. Storage conditions: Store in a dry place, protected from direct sunlight, at a temperature between –20 °C and +70 °C. Order codes 37056010 (main Brahma article) 246.124.067 (alternative Brahma marking)