Two Stage Gas Furnace Operation

These motors were not new.

Two stage gas furnace operation.

Gas furnaces sequence of operation troubleshooting. A full stop or at maximum. In this video i go over. A gas furnace made in the early 1970s typically has an afue of about 65 percent.

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. Gas furnaces sequence of operation why is furnace sequence of operation important. Instead of being either open or closed the gas valve can also be partly open. What makes a two stage furnace any different than a regular furnace.

Two stage heating eliminates the temperature swings associated with standard furnaces regulating temperature to within as little as one degree of the thermostat setting. 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. On off time for 2 stage or modulating furnace this will include the time the burner ignite to the burner extinguishes. Two stage furnaces also known as dual stage furnaces can run at two different settings.

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. There is no middle ground. The blower fan can adjust its speed to meet your heating needs efficiency. These furnaces have a two stage gas valve and a variable speed blower motor.

The lowest efficiency allowed by law for new gas furnaces is 78 percent and some new models achieve 97 percent. Are the components any different. This furnace turns either on or off. You could buy a two stage furnace with an ecm motor for over 15 years.

Annual burner operating hours compared to annual energy consumption. On is the highest flame setting and thus blows at its hottest level. 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. By far though most two stage furnaces were sold with the older less efficient motors.

And manufacturers and contractors have been pushing the save you money claim for over 20 years. Our forced air units can keep your home warm with models that automatically. Two stage furnaces start in the first stage when the amount of heat required is lower instead of reaching full capacity all at once. The test will include ratios from low fire to high fire in this test.

Additionally the test will include the. Two stage gas furnaces test of operation. But more importantly remember this changed in 2019.