Product overview
Details that help confirm the fit.
The Danfoss OBC 82.12 is a microprocessor-based electronic controller designed for the automatic sequencing, flame supervision and safety shutdown of two-stage forced-draught oil burners with a maximum oil throughput of 30 kg/h.
The controller can be used with burners equipped with an oil preheater as well as burners without a preheater. Digital control provides precise and reproducible operating timings that remain stable despite changes in supply voltage and ambient temperature.
When the boiler thermostat requests heat, the controller begins the oil-preheating sequence where applicable. After the oil reaches the required release temperature and the preheater thermostat closes, the burner motor starts the prepurge cycle and the ignition transformer is energised.
Following the programmed prepurge and pre-ignition period, the first-stage fuel valve V1 opens and supplies oil to the burner nozzle. The second-stage valve V2 subsequently opens according to the controller’s programmed sequence. When the boiler thermostat ends the heating demand, all output relays are de-energised and the controller returns to standby.
The OBC 82.12 continuously supervises the burner operating cycle and flame signal. If flame establishment fails or an unsafe operating condition is detected, the controller stops the burner and enters safety lockout.
A two-colour LED provides preheating, operating and lockout information. When the controller is in lockout, the detected fault can be displayed as a flash code using the reset button. Undervoltage is displayed automatically as eight flashes.
The controller limits automatic restart attempts after flame failure to three within the same operating period. It also limits the oil-preheating period to ten minutes. If the preheater does not reach its release temperature within the permitted period, the controller enters alarm mode.
Typical applications include two-stage oil burners, heating boilers, hot-water boilers, steam boilers and domestic or commercial liquid-fuel heating systems.
Installation, wiring, flame-detector selection, commissioning and fault diagnosis must be performed by qualified burner-service personnel. The complete Danfoss order code, burner wiring, timing sequence and flame detector must be checked before replacement.
Model, voltage, rotation, pressure range and mounting can vary. Final compatibility is confirmed against the nameplate or existing component.
