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  2. Flame lift-off - Wikipedia

    en.wikipedia.org/wiki/Flame_lift-off

    Flame lift-off in oil fired pressure jet burners is an unwanted condition in which the flame and burner become separated. This condition is most commonly created by excessive combustion air and often results in the loss of flame as the photoelectric cell fails to register the light of the flame, this in turn results in a safety lockout of the control box.

  3. Pilot light - Wikipedia

    en.wikipedia.org/wiki/Pilot_light

    An alternative to the pilot light is a system to create a high voltage electrical arc or spark between two electrodes, in order to light the gas flowing to the burner. Fail-safe design for such a system requires the burner flame to be detected by passing an electric current through the flame, which is received by the flame rectification circuit ...

  4. Forced-air gas - Wikipedia

    en.wikipedia.org/wiki/Forced-air_gas

    Each room has an outlet from the duct system, often mounted in the floor or low on the wall – some rooms will also have an opening into the cold air return duct. Depending on the age of the system, forced-air gas furnaces use either a pilot light or a solid-state ignition system (spark or hot surface ignition) to light the natural gas burner. [3]

  5. Flame supervision device - Wikipedia

    en.wikipedia.org/wiki/Flame_supervision_device

    For gas appliances, a flame supervision device (FSD) – alternative name: flame failure device (FFD) – is a general term for any device designed to stop flammable gas going to the burner of a gas appliance if the flame is extinguished. This is to prevent a dangerous buildup of gas within the appliance, its chimney or the room. [1]

  6. Central heating - Wikipedia

    en.wikipedia.org/wiki/Central_heating

    This limit controller may shut the furnace off if the blower fails or if something is blocking the air flow. The heated air is then sent back through the home through supply ducts. In larger commercial applications, central heating is provided through an air handler which incorporates similar components as a furnace but on a larger scale.

  7. Boiler explosion - Wikipedia

    en.wikipedia.org/wiki/Boiler_explosion

    [9] [13] Even a well-maintained firebox will fail explosively if the water level in the boiler is allowed to fall far enough to leave the top plate of the firebox (crown sheet) uncovered. [14] This can occur when crossing the summit of the hill, as the water flows to the front part of the boiler and can expose the firebox crown sheet.

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