{"id":4663,"date":"2024-10-21T12:30:54","date_gmt":"2024-10-21T12:30:54","guid":{"rendered":"https:\/\/briskaircool.com\/?p=4663"},"modified":"2024-10-21T12:30:54","modified_gmt":"2024-10-21T12:30:54","slug":"from-belts-to-blowers-understanding-the-key-components-of-your-furnace","status":"publish","type":"post","link":"https:\/\/briskaircool.com\/from-belts-to-blowers-understanding-the-key-components-of-your-furnace\/","title":{"rendered":"From Belts to Blowers: Understanding the Key Components of Your Furnace"},"content":{"rendered":"

A gas furnace consists of numerous different components and is far more complex than most people realize. For a furnace to run and heat effectively, all the components need to be in good shape and work correctly. <\/p>\n

Draft Inducer and Pressure Switch<\/h2>\n

When the thermostat signals a gas furnace that it needs to run, the first thing that happens is that the furnace’s draft inducer turns on. The main purpose of the draft inducer is to pull the hot combustion fumes the burners produce up through the heat exchanger and then ensure they flow outside through the exhaust flue. <\/p>\n

This allows the furnace to work safely and heat effectively while preventing the fumes from building up within the combustion chamber and starving the burner flames of oxygen. The upward airflow the draft inducer produces creates negative pressure within the furnace, which causes the pressure valve to close. When the valve closes, it creates a circuit that allows the gas valve in the furnace to open. <\/p>\n

Electronic Igniter<\/h2>\n

While some people may still have an old furnace with a pilot light, the majority of furnaces in use nowadays use an electronic igniter to light the burners. If the furnace has a hot-surface igniter, it usually turns on at the same time as the draft inducer to ensure it is hot enough to ignite the burners as soon as the pressure switch triggers the gas valve to open. Some furnaces use a direct-spark igniter instead, in which case the igniter normally doesn’t start sparking until the gas valve opens. <\/p>\n

Flame Sensor<\/h2>\n

The flame sensor is one of the most important safety features in a modern gas furnace, and its role is to prevent gas from continuing to flow should the igniter fail to light the burners or if the burners ever suddenly go out. It works by using an electrical current to detect the flames coming off the burners. If the burners don’t light or the sensor doesn’t detect the flames for any reason, the furnace’s control board will close the gas valve within a few seconds. This is important since you could end up with a major fire or even an explosion if gas were to continue flowing when the burners aren’t lit. <\/p>\n

Heat Exchanger and Temperature Limit Switch<\/h2>\n

A furnace heats the air flowing through it by drawing the hot combustion gases coming off the burners upward through several metal tubes that make up the heat exchanger. The fumes quickly cause these tubes to get extremely hot, and the heat then continually radiates off of the tubes into the air flowing over them. The result of this process is that the air usually reaches a temperature of around 120 to 140 degrees Fahrenheit before exiting the furnace. <\/p>\n

Another essential component that works hand in hand with the heat exchanger is the temperature limit switch, which continually measures the temperature inside the furnace. You’ve probably noticed that it takes around 30 seconds from when you hear your furnace light until it starts circulating air. This is because the temperature limit switch is what signals the furnace blower to turn on and off, and it won’t ever tell the blower to run until the heat exchanger is sufficiently hot. <\/p>\n

The switch then continues to monitor the temperature throughout the heating cycle and triggers the gas valve to close the furnace to shut off if the heat exchanger gets too hot. This is to prevent damage or the risk of fire that can occur if the furnace overheats. <\/p>\n

Once the building has reached the correct temperature, the thermostat then signals the furnace to shut off. However, the blower will continue running until the temperature limit switch senses that the heat exchanger is sufficiently cool. This is partly to ensure that the remaining latent heat in the heat exchanger isn’t wasted and also because the heat exchanger could still end up overheating if the blower were to shut off immediately.<\/p>\n

Furnace Blower<\/h2>\n

The last major component is the blower, which is the fan that draws air into the furnace and then moves the hot air coming out of the furnace around the building. If you have central air conditioning, the blower also circulates air when your air conditioning is on. Older HVAC systems sometimes have a belt-driven blower motor, whereas newer systems typically use bearings to drive the blower motor. <\/p>\n

Either the belt or bearings can end up wearing out over time, resulting in the blower starting to make a loud squealing or screeching noise. If you hear this type of noise, shut your heating off until you can get the belt or bearings replaced. The reason is that a worn-out belt or worn-out bearings can easily make the blower motor overheat and burn out. This will cost much more to repair than it would to just replace the belt or bearings. <\/p>\n

As one of the most experienced HVAC companies in the Coral Springs area, Brisk Air is the place to turn for your indoor comfort needs. We’ve been in business since 1972 and specialize in the full range of heating and air conditioning services. Do you have an issue with one of your furnace’s components or need to install a new furnace<\/a>, AC or heat pump? <\/p>\n

For any of these HVAC problems and lots more, give Brisk Air a call to get the reliable, professional heating service<\/a> your home or business deserves!<\/p>\n","protected":false},"excerpt":{"rendered":"A gas furnace consists of numerous different components and is far more complex than most people realize. For a furnace to run and heat effectively, all the components need to be in good shape and work correctly. Draft Inducer and Pressure Switch When the thermostat signals a gas furnace that it needs to run, the first thing that happens is that the furnace’s draft inducer turns on. The main purpose of the draft inducer is to pull the hot combustion fumes the burners produce up through the heat exchanger and then ensure they flow outside","protected":false},"author":2,"featured_media":3944,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[17,13],"class_list":["post-4663","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-heating","tag-heating-maintenance","tag-heating-systems"],"yoast_head":"\nBelts to Blowers: Understand Key Components of Furnaces | Brisk Air<\/title>\n<meta name=\"description\" content=\"Interested in knowing more about the key components of your furnace? 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