Back to results
US 10,712,047 B2Granted
Method of field conversion of a heating system to a multiple stage modulating gas fired heat exchanger
AssigneeLennox Industries Inc.
InventorsEric Perez, Steven Schneider, Bryan Smith, John Tran
Life of this patent
Estimating the term…
Abstract
A heating system retrofitted to be operable through multiple heat stages at a constant fuel-air mixture includes a tube heat exchanger having a plurality of burners, a combustion air blower (CAB) having an exhaust vent connected with the plurality of burners, the CAB operable at a first speed and a second speed, a first valve connecting a fuel source to a first subset of the plurality of burners, and a second valve connecting a fuel source to a second subset of the plurality of burners.
Claims6
A method, comprising:
- retrofitting a heating system to have a modulating gas-fired heat exchanger that is operable through multiple heat stages at a constant fuel-air mixture, wherein the heating system includes the heat exchanger having burners on a manifold, a combustion air blower (CAB) having an exhaust vent connected with the burners, and a first valve connecting a fuel source to the burners, the first valve comprising a first flow configuration, the first flow configuration consisting of a closed setting, a low-flow setting, and a high-flow setting, and a controller connected to the CAB and the first valve to operate the burners between a low fire mode and a high fire mode, the retrofitting comprising:
- connecting a first subset of the burners on the manifold to the fuel source through the first valve and connecting a second subset of the burners on the manifold to the fuel source through a second valve, the second valve comprising a second flow configuration, the second flow configuration consisting of a closed setting, a low-flow setting, and a high-flow setting;
- and
- wherein the first valve and the second valve are upstream in relation to the manifold.
1 more element
Dependencies are inferred from the claim text.