Forced-Air Furnace Operation. Its Stages

Forced-Air Furnace Operation. Its Stages

The most common type of heating system found in homes is forced-air furnaces. They blow heated air through ductwork and out vents. Over the last 50 years there were many changes and advances in home comfort technology. However, furnaces remained in the top slot because of their effective heating power, and (with gas furnaces) efficient energy use.

The advantage of furnaces is considered to serve long.  However they require diligent yearly maintenance and timely repairs. Make your call at Jupiter Air Conditioning and Heating for skilled heating service in Burbank, CA. We are serving Los Angeles with quality heating and cooling for a long time.

Forced-air furnaces work. Stages

A control board manages the stages of a furnace, signaling to the components when they should turn on and off. The thermostat sends the signals to initiate the heating stages whenever the thermostat’s sensors register that the house requires heating.

First, the blower motor of the furnace comes on, which draws air from the return vent into a combustion chamber. The control board signals to the gas valve to open up the flow of gas into the burner, where the gas jets are located. Once the gas flow begins, an electronic igniter turns on, growing hot enough to the point that it ignites the gas jets along the burner. Older systems use a standing pilot light, and some use an intermittent pilot that comes on via an electric spark when needed.

The next stage involves transferring the heat from the gas jets to the air from the blower. The high temperature combustion gas enters a clamshell chamber called the heat exchanger. The metal walls of the exchanger grow hot, and this heat transfers to the air from the blower.

The blower moves the heated air along and into the air handler, where the air is then distributed into the ductwork system. The sealed ducts maintain the air pressure of the conditioned air, carrying it all the way to the vents into the rooms while losing as little warmth as possible. As this happens in the vents, the exhaust gas remaining in the heat exchanger vents out of the furnace through the exhaust flue, safely rising out a chimney to the outside.

Once the thermostat senses that the target temperature has been reached, the control board shuts off the gas valve to the burner. The blower motor remains on until the temperature inside the furnace itself drops.

Don’t try repairs on your own

Gas furnaces can be dangerous if handled improperly. Don’t open the furnace cabinet yourself or attempt any repair work unless you are a professional HVAC technician. If you face the problem with your furnace heating service in Burbank, CA, call Jupiter Air Conditioning and Heating Service any time of the day or night for the service that will safely restore it.