Gas Furnace Parts And Function

A gas furnace is an indispensable appliance in every house located in the colder regions of the world. The basic modus operand of gas furnace is that it converts gas into heat which is circulated to the rooms through network of ducts. Although today people are opting for greener means of heating and cooling such as geothermal heat pumps or solar heating, these units are often integrated with furnace units to supply heat in extreme climates when the main unit is not able to meet the requirement. A gas furnace is rated above furnaces that run on, coal and oil to heat homes, as it is more eco-friendly than other. Gas furnaces are powered by natural gas. A good model can operate at 95% efficiency. This implies that the dollars you pay for per unit of energy gets converted into heat for your home’s indoors.

The parts of a gas furnace

Before we take a look at how a furnace works, let’s take look at its parts. It can be broadly divided into three categories. The first category would include the burner, heat exchanger, vent, and draft inducer. The second category consists of safety devices and controls. The third consists of the blower and air movement. All the parts work in tandem to give you perfect efficiency and comfort.

How does it work?

Gas finance is a forced air system. It gets activated as soon as air temperature drops below the programmed setting on a thermostat. The temperature in the thermostat can be set manually. It also can automatically sense the room air and therefore decide for the amount of heating required. It thereby alerts the furnace. As soon as the furnace gets signal from the thermostat, a valve open which allows the fuel to travel to burner. The fuel is ignited by an electronic igniter. The gas when com busted generates heat which starts rising up through the heat exchanger situated above the burner. On the other hand the cold air is taken in through the return duct and passed through a filter and then comes to an enclosed space known as the plenum which is located opposite to the heat exchanger. The exchanger then heats the air very quickly. This hot air which is circulated throughout the house though ducts. The remaining exhaust is vented out from gas furnace. The exhaust gas is sent outside the house.





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