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Your electric furnace is not going to be able to do you much good without your contactor. You will need this in order to keep the temperature in your home nice and comfortable during the winter season. Sequencer. A sequencer used on an electric furnace is something that will turn your heating elements either on or off. It can do this to more than one should this be necessary. A sequencer is needed because it helps to keep the current spike that is electric down. This is something that can happen whenever your electrical device becomes energized in any way. It does not take much for your electrical device to become energized.
The first type are simple ignition controls which control the gas valve, the ignitor (either a spark generator or hot surface ignitor), and a flame sensing circuit. These controls are more common on older less efficient units. The other type is usually referred to as an integrated furnace control.n a call for heat, they first start the induced draft motor (if the furnace has one). Then, the inducer causes a pressure switch to close. The control then either ignites the pilot, starts the direct spark ignitor, or starts the warmup of the hot surface ignitor.