Danfoss High-voltage ignition transformer EBI4 CM S 052F4047

Danfoss EBI4 CM S high-voltage ignition transformer, SKU 052F4047, operates at 220–240 V supply voltage and 50–60 Hz frequency. It provides a secondary current of 30 mA and draws a primary current of 0.25 A. This transformer is used in burners to step up mains voltage to produce a spark for igniting the fuel-air mixture during the ignition phase. The ignition cables are silicone-insulated to withstand high voltage and heat.

When selecting a replacement ignition transformer of this type, verify the primary voltage (typically 230 V, but 110 V and 24 V versions exist) and secondary output (voltage and current) against the burner control requirements and electrode gap specifications. Parts are chosen by secondary voltage and current, primary voltage, duty cycle, mounting arrangement, terminal type, and cable connector pattern. Before ordering, compare these specifications with the existing unit and ensure the mounting form matches.

Common failure modes include internal short circuits or open windings, leading to no spark or weak spark. A hardened or cracked ignition cable can leak the spark to earth, mimicking a faulty transformer. Check the cable condition before replacing the transformer itself. If the burner fails to ignite or has intermittent ignition, inspect the transformer and cables for damage.