Combustion acoustic noise prevention in a heating furnace
First Claim
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1. A control module for preventing acoustic resonance noise generation from a heat exchanger of a heating furnace, comprising:
- a circuit board, the circuit board configured to operate an induction fan of the heating furnace at more than one speed for a given heat demand mode of the heating furnace and further configured, in response to a request for a high heat demand mode, to cause the induction fan of the furnace to operate at a low speed during, and for a stabilization period after, flame ignition of a burner coupled to the heat exchanger of the heating furnace, the circuit board further configured to cause a fuel input rate to the burner of the heating furnace, configured as a multi-stage heating furnace, to be less than a fuel input rate for the high heat demand mode until the end of the stabilization period;
wherein the low speed is less than a higher speed designed to support the heating furnace operating at a maximum rated thermal output, and wherein the circuit board is further configured to cause the induction fan to operate at the high speed following the stabilization period.
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Abstract
A control module for preventing acoustic resonance noise generation from a heat exchanger of a heating furnace, comprising a control signal generated by the control module. The control signal is configured to operate an induction fan of the heating furnace at more than one speed for a given heat demand mode of the heating furnace.
28 Citations
11 Claims
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1. A control module for preventing acoustic resonance noise generation from a heat exchanger of a heating furnace, comprising:
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a circuit board, the circuit board configured to operate an induction fan of the heating furnace at more than one speed for a given heat demand mode of the heating furnace and further configured, in response to a request for a high heat demand mode, to cause the induction fan of the furnace to operate at a low speed during, and for a stabilization period after, flame ignition of a burner coupled to the heat exchanger of the heating furnace, the circuit board further configured to cause a fuel input rate to the burner of the heating furnace, configured as a multi-stage heating furnace, to be less than a fuel input rate for the high heat demand mode until the end of the stabilization period; wherein the low speed is less than a higher speed designed to support the heating furnace operating at a maximum rated thermal output, and wherein the circuit board is further configured to cause the induction fan to operate at the high speed following the stabilization period. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A fuel-fired heating furnace, comprising:
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heat exchanger assembly; a burner assembly coupled to the heat exchanger assembly and configured to produce a flame within the heat exchanger assembly; an induction assembly, the induction assembly including an induction fan configured to draw air through the heat exchanger assembly; and a control module configured to operate the induction fan at more than one speed for a given heat demand mode of the heating furnace, and further configured, in response to a request for a high heat demand mode, to cause the induction fan to operate at a low speed during, and for a stabilization period after, flame ignition within the burner assembly, the control module further configured to cause a fuel input rate to the burner of the heating furnace, configured as a multi-stage heating furnace, to be less than a fuel input rate for the high heat demand mode until the end of the stabilization period; wherein the low speed is less than a high speed designed to support the heating furnace operating at a maximum rated thermal output, and wherein the circuit board is further configured to cause the induction fan to operate at the high speed following the stabilization period.
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9. A method of preventing acoustic resonance noise generation from a heat exchanger of a fuel-fired heating furnace, comprising:
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providing an induction fan of the heating furnace capable of operating at more than one speed for a given heat demand mode of the heating furnace; receiving a request for a high heat demand mode; operating the induction fan of the furnace at a low speed during, and for a stabilization period after, flame ignition of a burner coupled to the heat exchanger of the heating furnace, wherein the low speed is less than a high speed designed to support the heating furnace operating at a maximum rated thermal output; supplying fuel to the burner of the heating furnace at a fuel input rate that is less than a high heat demand mode fuel input rate until the end of the stabilization period; causing the induction fan to operate at the high speed following the stabilization period. - View Dependent Claims (10, 11)
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Specification