There are many types of electronic furnace ignition, but we'll only discuss two here. The first type is hot surface ignition. It involves a silicon carbon element that continues to heat up until it has reached a temperature capable of igniting the gas flowing into the furnace. If for some reason the silicon carbon element does not reach a high enough temperature to start combustion, a flame sensor will automatically shut off the gas valve.
The next type we'll discuss is mercury bulb ignition. These systems detect whether or not the pilot has been successfully lit. The perform the same role as the thermocouple. It's important to note that this type of electronic furnace ignition is falling more and more out of favor because mercury is hazardous to both humans and the environment. You may want to find out which type of furnace you have, and you can do so by contacting an HVAC professional through ac repair in Chatham NJ.
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