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An oil furnace has a step up transformer to generate a spark to ignite the oil spray at the tip of the nozzle.

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14y ago

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Where is a step up transformer used in the home?

An example would be if you had a oil furnace, the ignition system would be a step up transformer. The step up 120 volt to 15000 volt transformer is used to ignite the fuel that comes out of the nozzle under high pressure to make the fuel burn.


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Does an oil furnace have a pilot light?

Well, the answer is "yes and no". A True oil FURNACE or BOILER does NOT not normally have a 'pilot light". Instead, they have some type of electrical ignition system. In the past--this was accomplished with an "iron" type of transformer that increased the 120 volt line voltage to 6-10 thousand volts, enough to cause a spark to jump across a pair of electrodes mounted above the "nozzle" where the oil sprays out of.This spark would ignite the oil and a very intense , hot flame would then shoot out into the combustion chamber--producing the heat, which in turn heated air or water to heat the building. This is only active when the furnace is on, and so--no oil is wasted to keep a pilot lit, as in a gas furnace with a pilot. Nowadays--the oil is still lit by a spark across electrodes, BUT the inefficent, heavy, sometimes unreliable 'iron" transformer is being replaced by an "electronic ignitor" which contains a transformer, BUT it is powered by an electronic "switching supply" circuit, resulting in MUCH more voltage-14 to 20K volts, and using a LOT less AC power to do this. So--no most oil burners do NOT have a pilot light, like a gas furnace sometimes does. BUT--I HAVE seen , many years ago, oil fueled "space heaters" which DID use a pilot flame. These do NOT normally have a pump like a normal furnace, ad depend on gravity to feed the oil to the burner. The pilot functioned the same way that a gas furnace pilot does--but probably had a wick-type element to be able to burn-like a kerosene heater does.