Two Stage Gas Furnace Operation

Annual burner operating hours compared to annual energy consumption.

Two stage gas furnace operation.

To understand a single stage furnace s operation imagine traveling to a destination in a car whose accelerator regulates the speed at either of two settings. These motors were not new. A two stage furnace works by using a different set of programming than a normal one stage furnace. On is the highest flame setting and thus blows at its hottest level.

The lowest efficiency allowed by law for new gas furnaces is 78 percent and some new models achieve 97 percent. This furnace turns either on or off. These furnaces have a two stage gas valve and a variable speed blower motor. Simply put when it is only moderately cold inside then the furnace s control board opens the fuel control valve to the partially open position and heats the house to the desired temperature before turning off.

If a technician is to properly troubleshoot a gas furnace he needs to know the proper sequence of operation for the particular furnace he is troubleshooting. By far though most two stage furnaces were sold with the older less efficient motors. The blower fan can adjust its speed to meet your heating needs efficiency. How a two stage furnace works.

Two stage furnaces start in the first stage when the amount of heat required is lower instead of reaching full capacity all at once. Are the components any different. Additionally the test will include the. Our forced air units can keep your home warm with models that automatically.

Instead of being either open or closed the gas valve can also be partly open. But more importantly remember this changed in 2019. What makes a two stage furnace any different than a regular furnace. Carrier gas furnaces offer a model to suit every need with intelligent multi stage variable speed models in our premium infinity series deluxe two stage choices in our performance series and 90 afue efficient models in our value driven comfort series.

A gas furnace made in the early 1970s typically has an afue of about 65 percent. Gas furnaces sequence of operation why is furnace sequence of operation important. Two stage furnaces also known as dual stage furnaces can run at two different settings. Gas furnaces sequence of operation troubleshooting.

In gas furnace troubleshooting i believe the most common furnace to fail is the furnace that. On off time for 2 stage or modulating furnace this will include the time the burner ignite to the burner extinguishes. In this video i go over. Two stage gas furnaces test of operation.

A full stop or at maximum. You could buy a two stage furnace with an ecm motor for over 15 years. There is no middle ground.