Brahma 37106225 CM31F control box

Brahma CM31F is a microprocessor-based controller (“burner management unit”) from the CM series, designed for automatic ignition control, flame monitoring and safe operation of forced‑draught (fan‑assisted) atmospheric gas burners of progressive (modulating) type, operating in intermittent (cyclic) mode. The device is equally effective for forced‑air burners and (in some configurations) for fanless burners. Applications: gas heating and combination boilers (domestic and industrial); hot air guns, warm air generators (Master BV70, BV110, BV170, BV290, B230, B360, OKLIMA and others); air heaters, infrared heaters, radiant tube heaters; water heaters, process furnaces, combi steamers; burners from Riello, Baltur, Weishaupt, Lamborghini and other brands. Important information about timing parameters The CM31F model is available in several versions that differ in pre‑purge time (tv/tp), safety time (ts) and waiting time (tw). For article 37106225 these parameters are preset by the manufacturer. Before purchasing, always compare the marking on your old unit with the specifications of the new one. Typical combinations for CM31F: tv/tp = 1.5 s, ts = 10 s, tw = 1.5 s (e.g., art. 37106206) tv/tp = 20 s, ts = 5 s, tw = 20 s (e.g., art. 37106225 — probable parameters) tv/tp = 20 s, ts = 10 s, tw = 20 s (other versions) Check the actual values with the seller or from the marking on the housing. Parameter mismatch will lead to improper operation or safety lockouts. Main functions and features Support for progressive (modulating) burners with fan: Provides smooth power modulation, optimising fuel consumption and reducing the number of starts/stops. Manual lockout reset (non‑volatile lockout): Under any abnormal condition (no flame, open ionisation circuit, ignition failure) the unit goes into 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 and meets the highest safety class. 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. Built‑in high‑voltage ignition transformer: No external ignition unit required; spark voltage 20 kV. Two independent safety contacts: Redundancy for gas valve control circuits for maximum safety. EMC filter: Suppresses electromagnetic interference from the ignition transformer, ensuring stable operation of the electronics. Built‑in varistor and fuse: Protection against voltage surges and short circuits. It is recommended to use an external fast‑acting fuse of suitable rating (the internal fuse is not replaceable). High reliability: Controller service life: more than 250,000 switching cycles under maximum load. Compact impact‑resistant housing made of self‑extinguishing plastic. Mounting in any position (on DIN rail or by screws). Protection class IP00 (requires installation in a protective enclosure/control cabinet). Standards compliance: Certified according to EN 298:2003 (classification code AMCLXN) and complies with CE directives (CE PIN 0694BR1154). Technical specifications Parameter Value Model Brahma CM31F Article numbers 37106225, 246.124.085 Rated voltage 220–240 V AC, 50/60 Hz (110–120 V version available) Power consumption 7 VA (start‑up up to 10 VA) Burner type Atmospheric gas with fan, progressive Operating mode Intermittent (must be stopped at least once every 24 hours) Pre‑purge time (tv/tp) Check on housing label (presumably 20 s) Safety time (ts) Check on housing label (presumably 5 s) Waiting time (tw) Check on housing label (presumably 20 s) Minimum ionisation current 1.2 µA Response time on flame loss 5 µA for reliable operation). Lockout reset: When a safety lockout occurs, find and eliminate the cause, then manually 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. 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 Specialisation for progressive burners with fan: Optimal power control, fuel savings. Highest safety level: Manual lockout reset, two independent safety contacts, instant flame monitoring (<1 s). Reliability: More than 250,000 cycles, built‑in overvoltage protection and EMC filter. Ease of installation: Built‑in powerful ignition transformer (20 kV), compact housing, DIN rail mounting. Italian quality: High‑grade components, strict production control, compliance with European EN 298 standards. Package contents Brahma CM31F burner control unit (art. 37106225) – 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. The warranty period is typically 6–12 months from the date of sale (please check with the seller) provided that installation and operating rules are followed. Order codes 37106225 (main Brahma article) 246.124.085 (alternative marking)