Pressure switch assembly for a furnace
First Claim
1. A pressure switch assembly for use with a furnace controller having a first input and a second input, the pressure switch assembly comprising:
- a first pressure switch configured to actuate at a first combustion pressure level and connected to the first input;
a second pressure switch configured to actuate at a second combustion pressure level; and
a third pressure switch configured to actuate at a third combustion pressure level,wherein pressure signals provided on the second input from at least one of the second pressure switch and the third pressure switch are used by the furnace controller to derive actuation states of the second and third pressure switches.
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Accused Products
Abstract
A pressure switch assembly is used with a furnace controller having a first input and a second input. A first pressure switch is configured to actuate at a first combustion pressure level and is connected to the first input. A second pressure switch is configured to actuate at a second combustion pressure level, and a third pressure switch is configured to actuate at a third combustion pressure level. Pressure signals provided on the second input from at least one of the second pressure switch and the third pressure switch are used by the furnace controller to derive actuation states of the second and third pressure switches.
64 Citations
17 Claims
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1. A pressure switch assembly for use with a furnace controller having a first input and a second input, the pressure switch assembly comprising:
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a first pressure switch configured to actuate at a first combustion pressure level and connected to the first input; a second pressure switch configured to actuate at a second combustion pressure level; and a third pressure switch configured to actuate at a third combustion pressure level, wherein pressure signals provided on the second input from at least one of the second pressure switch and the third pressure switch are used by the furnace controller to derive actuation states of the second and third pressure switches. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A gas-fired induced-draft furnace that has low, medium, and high firing rates, the furnace comprising:
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a furnace controller having a first pressure switch input and a second pressure switch input; a heat exchanger; and a pressure switch assembly configured to sense low, medium, and high pressures across the heat exchanger corresponding to the low, medium, and high firing rates and to generate pressure signals that vary in accordance with differential pressure sensed across the heat exchanger, wherein the pressure signals are provided on the first and second pressure switch inputs. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method of producing three stages of operation from a furnace including a furnace controller having a first pressure switch input and a second pressure switch input, the method comprising:
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connecting a first single pole, single throw pressure switch to the first pressure switch input that actuates at a first combustion pressure level; connecting a single pole, double throw pressure switch to the second pressure switch input, wherein the single pole, double throw pressure switch actuates to a first contact at a second combustion pressure level and to a second contact at a third combustion pressure level; connecting a second single pole, single throw pressure switch to the first contact that is actuates at the second combustion pressure level; and connecting a third single pole, single throw pressure switch to the second contact that actuates at the third combustion pressure level. - View Dependent Claims (17)
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Specification