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he TF 974 oil burner safety control boxes are suitable for oil burners which may be equipped with an oil preheater up to 30 kg/h capacity.
1-stage operation post-ignition time ca. 20 sec. low voltage protection according to EN230
A special contact in the control unit short-circuits the thermo-switch of the fuel heater as soon as the burner is operating and the flame signal is present. Therefore interruption of the burner operation due to decreasing oil temperature can be prevented (e.g. in case of high oil flow). If the control box goes into lock-out mode, the oil preheater power supply is also disconnected.
The TF 974 features a manual reset from lockout provided by a push button with an integrated lockout signal lamp. A central fixing screw locks the control box to the wiring base. The wiring base and control box have a positive plug-in arrangement. A variety of cable entry points provides utmost flexibility of electrical wiring
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