Brahma 37106218 CM31F control box

Brahma CM31F is a microprocessor-based controller (“burner management unit”) from the EUROBOX series, designed for automatic ignition control, flame monitoring and safe operation of atmospheric gas burners with a fan (forced draught). The device operates in intermittent (cyclic) mode and is suitable for progressive (modulating) burners. Thanks to its characteristics, the CM31F is widely used in various heat‑generating equipment: gas-fired heating and combination boilers (domestic and industrial); hot air guns, warm air generators; air heaters, infrared heaters; water heaters, process furnaces, drying chambers; burners from Riello, Baltur, Weishaupt, Lamborghini and other brands. Main functions and features Specialisation for fan‑assisted burners – The CM31F model is specifically designed for atmospheric gas burners with forced air supply, ensuring optimal performance in such systems. Fully automatic combustion cycle – The unit autonomously manages the complete cycle: false flame check → pre‑purge → ignition (with ionisation flame control) → combustion monitoring → safe shutdown on flame loss. Fixed timing parameters for art. 37106218 – Pre‑purge time (tv/tp) = 10 seconds, safety time (ts) = 5 seconds. This version is one of the most popular for forced‑draught burners. Ionisation flame control – Flame detection via an ionisation electrode (rectification effect). Response time on flame loss is less than 1 second, meeting EN 298 requirements. High safety level – Non‑volatile (hardware) lockout with manual reset – under any abnormal condition (no flame, open ionisation circuit, ignition failure) the unit goes into safety lockout. Restart is only possible manually by pressing the Reset button on the housing after the cause has been eliminated. This prevents the burner from starting unintentionally. – Two independent safety contacts for redundancy of critical gas valve control circuits. – Built‑in EMC filter to suppress electromagnetic interference from the ignition transformer and other sources. – Overvoltage protection – built‑in varistor and fuse. – Integrated high‑voltage ignition transformer – simplifies installation and reduces external components. Compact housing made of impact‑resistant, self‑extinguishing plastic. Protection class IP00 (when used with a suitable base, IP40 can be achieved). Mounting in any position (on DIN rail or by screws). To achieve IP40 protection, a base with an appropriate design must be used. High reliability – Controller service life: more than 250,000 switching cycles under maximum rated load. Standards compliance – The device is certified according to European directives (CE) and fully complies with EN 298:2003 (automatic burner control systems for gas burners). Technical specifications Parameter Value Model Brahma CM31F Article numbers 37106218, 246.124.084 Rated voltage 220–240 V AC, 50/60 Hz Power consumption 9 VA Burner type Atmospheric gas burner with fan (progressive) Operating mode Intermittent (must be stopped at least once every 24 hours) Pre‑purge time (tv/tp) 10 seconds Safety time (ts) 5 seconds Minimum ionisation current 0.5 µA Response time on flame loss 5 µA). Lockout reset – When a safety lockout occurs, find and eliminate the cause, then press the Reset button on the housing. Maintenance – Periodically check the condition of the ionisation electrode, its insulation and the gap relative to the burner. Contamination or wear can cause 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. Advantages over alternatives Specialised timing (10/5 s) – Optimal choice for forced‑draught burners requiring a 10‑second purge and having a short safety time. Reliability – More than 250,000 cycles, built‑in overvoltage and EMC protection. Safety – Manual lockout reset + non‑volatile fault memory + double safety contacts meet the highest EN 298 standards. Ease of installation – Built‑in ignition transformer, compact housing, DIN rail mounting capability. Italian quality – High‑grade components, strict production control. Package contents Brahma CM31F burner control unit (art. 37106218) – 1 pc. Quick installation and operation guide (several languages). Note: Ionisation electrode, ignition electrode and connection base are sold separately. Storage conditions and warranty Store in a dry place, protected from direct sunlight, at a temperature between –20 °C and +70 °C. Warranty period is 12 months from the date of sale (please check with the seller) provided that installation and operating rules are followed. Order codes 37106218 (main Brahma article) 246.124.084 (alternative marking)