System and Method for Controlling A Furnace
First Claim
1. A method of controlling a modulating gas furnace, comprising:
- 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, wherein the second pressure is between the first pressure and the 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 modulating gas furnace in response to at least one of the low pressure limit switch, the intermediate pressure limit switch, and the high pressure limit switch.
1 Assignment
0 Petitions
Accused Products
Abstract
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.
-
Citations
21 Claims
-
1. A method of controlling a modulating gas furnace, comprising:
-
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, wherein the second pressure is between the first pressure and the 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 modulating gas furnace in response to at least one of the low pressure limit switch, the intermediate pressure limit switch, and the high pressure limit switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
-
-
20. A modulating gas furnace, comprising:
-
a plurality of pressure switches configured to monitor a pressure differential associated with the modulating gas furnace; and a modulating combustion system configured for selective operation at a first output capacity range and a second output capacity range; wherein operation of the modulating combustion system in response to the plurality of pressure switches while operating at the first output capacity range differs from the operation of the modulating combustion system in response to the plurality of pressure switches while operating at the second output capacity range. - View Dependent Claims (21)
-
Specification