Two Stage Gas Furnace Operation

On off time for 2 stage or modulating furnace this will include the time the burner ignite to the burner extinguishes.

Two stage gas furnace operation.

Two stage heating eliminates the temperature swings associated with standard furnaces regulating temperature to within as little as one degree of the thermostat setting. Instead of being either open or closed the gas valve can also be partly open. On is the highest flame setting and thus blows at its hottest level. There is no middle ground.

Gas furnaces sequence of operation why is furnace sequence of operation important. Two stage furnaces start in the first stage when the amount of heat required is lower instead of reaching full capacity all at once. And manufacturers and contractors have been pushing the save you money claim for over 20 years. What makes a two stage furnace any different than a regular furnace.

These furnaces have a two stage gas valve and a variable speed blower motor. This furnace turns either on or off. The lowest efficiency allowed by law for new gas furnaces is 78 percent and some new models achieve 97 percent. These motors were not new.

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. You could buy a two stage furnace with an ecm motor for over 15 years. Two stage gas furnaces test of operation. Two stage furnaces also known as dual stage furnaces can run at two different settings.

How a two stage furnace works. Gas furnaces sequence of operation troubleshooting. In this video i go over. But more importantly remember this changed in 2019.

The test will include ratios from low fire to high fire in this test. 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. A full stop or at maximum. Annual burner operating hours compared to annual energy consumption.

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 two stage furnace works by using a different set of programming than a normal one stage furnace. Additionally the test will include the. The blower fan can adjust its speed to meet your heating needs efficiency.

Are the components any different. A gas furnace made in the early 1970s typically has an afue of about 65 percent. Our forced air units can keep your home warm with models that automatically.