Brahma 37789001 NDTM12 control box

Brahma NDTM12 (37789001) is a modern, fully automatic microprocessor controller for the safe start‑up and operation of gas and oil burners. It handles all stages of operation: from fan activation to continuous flame monitoring. Thanks to a built‑in EMC filter, the unit is resistant to electromagnetic interference and ensures stable operation even in demanding industrial environments. Main features For modulating burners: The controller is ideally suited for systems requiring smooth power adjustment. Two independent safety contacts for gas valve control. Flame monitoring via a photodetector. Built‑in ignition transformer and interference‑suppression EMC filter for stable performance. Overheat protection (safety thermostat) and undervoltage protection (below 175 V). Impact‑resistant plastic housing protects internal components from damage, dust and dirt. Varistor protects the controller against mains voltage surges. Built‑in 4 A fuse protects internal circuits against short circuits. Intelligent self‑diagnosis: Forced restart every 24 hours of continuous operation for internal system self‑check. Fault reset options: Versions available with manual (button) or electric (power interruption) reset. Easy connection: Built‑in fuse and overvoltage protection. Wide compatibility: For boilers, air heaters, furnaces, hot air guns and other heat‑engineering equipment. Main specifications Parameter Value Article numbers 37789001, 246.124.214 Category Burner control units Manufacturer Brahma Supply voltage 220‑240 V, 50/60 Hz Power consumption 30 VA Pre‑purge time (tv/tp) 60 seconds Safety time (ts) 4 seconds Waiting time (tw) 60 seconds Operating temperature range –20 °C to +70 °C Protection class IP00 Dimensions (L × W × H) 107 × 81 × 36 mm Weight 0.2 kg Certification CE (PIN 0694BP0610), EN298, EN230:2005 Applications Used in automatic control of gas and oil burners for: Heating, steam and combination boilers Air heaters and hot air guns Furnaces, water heaters and other process equipment Electrical connections Installation must comply with national electrical safety requirements. Phase and neutral must be connected correctly – incorrect wiring can lead to malfunction and unsafe conditions. Proper earthing of the control unit, the burner metal housing and the mains supply must be ensured. Always check all connections before initial start‑up. Operating principle The NDTM12 controller automatically manages the burner according to the following sequence: Start: When the thermostat contacts close, the controller supplies power to the fan motor. Pre‑purge: The fan runs, purging the combustion chamber for 60 seconds. Ignition: The ignition transformer is energised and gas is supplied to the main valve. Flame monitoring: Within 4 seconds (safety time), the system waits for a signal from the photodetector. Stable operation: If flame is present, the ignition transformer is de‑energised and the burner continues normal operation. Safety shutdown: If flame does not appear within 4 seconds or is lost during operation (response time less than 1 second), the control unit shuts off the gas and enters lockout. Manual intervention (pressing the Reset button) is required to restart. Forced restart: After every 24 hours of continuous operation, the controller automatically restarts to perform internal self‑diagnosis. Order codes 37789001, 246.124.214