9 Operating your furnace
9.1 How it works Your furnace is equipped with a self-regulated combustion air supply control system. Using two temperature sensors in the combustion chamber that measure the temperature in real time, your furnace will automatically adjust the amount of combustion air required for the cleanest and most efficient combustion. Coupled with the thermostat, the furnace will automatically modulate the combustion rate according to the thermostatic demand. When the thermostat calls for heat, combustion will be at its maximum burn rate. Conversely, when the thermostat is satisfied with heat, the combustion burn rate will be slowed down to maximum. A third temperature sensor located in the plenum controls the air distribution fan. This will distribute the necessary heat in your ducts to satisfy the thermostat while maintaining a safe temperature in your heating system.
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