System and method for controlling a furnace

Details System and method for controlling a furnace System and method for controlling a furnace

F - Mech Eng,Light,Heat,Weapons

24

H

F24H 9/20 (2006.01) F24H 3/02 (2006.01) F27D 19/00 (2006.01)

Patent

CA 2720801

Controlling a modulating gas furnace by monitoring a differential pressure associated with the modulating gas furnace using a low pressure limit switch configured to actuate at a first pressure, an intermediate pressure limit switch configured to actuate at a second pressure, and a high pressure limit switch configured to actuate at a third pressure, the second pressure being between the first and third pressure, selectively operating the modulating gas furnace in one of a cycling mode, a modulating mode in a lower range, and a modulating mode in an upper range, the modulating mode in the lower range being associated with an output capacity range between the output capacity ranges of the cycling mode and the modulating mode in the upper range, and selectively operating the furnace in response to at least one of the low pressure limit switch, the intermediate pressure limit switch, and the high pressure limit switch.

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