US5307990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adaptive forced warm air furnace using analog temperature and pressure sensors
Assignee: Honeywell Inc
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Filing: 1992-11-09
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Granted: 1994-05-03
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Expires: 2012-11-09
Abstract
Abstract Furnace control for a forced air furnace utilized in multi-zone heating. The forced air furnace is made up of return ducts, a heat exchanger, warm air ducts, a circulation blower, and a burner. The forced air furnace receives heating requests from external control means wherein the furnace provides heat to a zone or multiple zones to be heated. The control for the furnace comprises a temperature sensor for sensing the temperature of the heat exchanger, a regulator for regulating the burner to hold the temperature at the heat exchanger constant during the on cycle of the furnace, a pressure sensor for measuring the pressure in the heat exchanger and a controller for controlling the circulation blower in order to maintain a constant pressure within the heat exchanger.
Inventors
- 👤 Wilmer L. Adams
- 👤 Ralph H. Torborg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:47
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; F24H15/00; F24H15/20; F24H15/208; F24H15/242; F24H15/30; F24H15/305; F24H15/31; F24H15/345; F24H15/35; F24H15/355; F24H15/36; F24H15/40; F24H15/414; F24H15/421
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
148 words
A method for regulating circulation blower setpoints to maintain constant pressure in a forced air zoned heating system the forced air furnace having return ducts, a heat exchanger, warm air ducts, a circulation blower, and a burner, comprising the steps of: receiving a heating request from an external controller; energizing the burner in the furnace to heat the heat exchanger; sensing the temperature of the heat exchanger; energizing the circulation blower when the heat exchanger reaches a first predetermined temperature; regulating the burner to maintain a second predetermined temperature, said second predetermined temperature being higher than said first predetermined temperature; sensing the pressure in the heat exchanger; regulating the circulation blower at a circulation setpoint to maintain a constant pressure in the heat exchanger; de-energizing the burner when said heating request is satisfied; and de-energizing the circulation blower when said heat exchanger cools to said first predetermined temperature.
Claim 2
Independent Claim
148 words
A method for regulating circulation blower setpoints to maintain constant pressure in a forced air zoned heating system the forced air furnace having return ducts, a heat exchanger, warm air ducts, a circulation blower, and a burner, comprising the steps of: receiving a heating request from an external controller; energizing the burner in the furnace to heat the heat exchanger; sensing the temperature of the heat exchanger; energizing the circulation blower when the heat exchanger reaches a first predetermined temperature; regulating the burner to maintain a second predetermined temperature, said second predetermined temperature being higher than said first predetermined temperature; sensing the pressure in the heat exchanger; regulating the circulation blower at a circulation setpoint to maintain a constant pressure in the heat exchanger; de-energizing the burner when said heating request is satisfied; and de-energizing the circulation blower when said heat exchanger cools to said first predetermined temperature.
Claim 3
Independent Claim
153 words
A method for regulating circulation blower setpoints to maintain constant pressure in a forced air zoned heating system the forced air furnace having return ducts, a heat exchanger, warm air ducts, a circulation blower, and a burner, comprising the steps of: receiving a heating request from an external controller; energizing the burner in the furnace to heat the heat exchanger; energizing the circulation blower; sensing the pressure in the heat exchanger; regulating the circulation blower at a circulation setpoint to maintain a constant pressure in the heat exchanger; measuring the time required to satisfy said heating request; increasing the circulation blower setpoint to maintain a second constant pressure if said time required to satisfy said heating request increases; decreasing the circulation blower setpoint to maintain a third constant pressure if said time required to satisfy said heating request decreases; and de-energizing the burner and the circulation blower when said heating request is satisfied.
Claim 4
Independent Claim
153 words
A method for regulating circulation blower setpoints to maintain constant pressure in a forced air zoned heating system the forced air furnace having return ducts, a heat exchanger, warm air ducts, a circulation blower, and a burner, comprising the steps of: receiving a heating request from an external controller; energizing the burner in the furnace to heat the heat exchanger; energizing the circulation blower; sensing the pressure in the heat exchanger; regulating the circulation blower at a circulation setpoint to maintain a constant pressure in the heat exchanger; measuring the time required to satisfy said heating request; increasing the circulation blower setpoint to maintain a second constant pressure if said time required to satisfy said heating request increases; decreasing the circulation blower setpoint to maintain a third constant pressure if said time required to satisfy said heating request decreases; and de-energizing the burner and the circulation blower when said heating request is satisfied.
Claim 5
Dependent Claim
77 words
The method for regulating circulation blower setpoints of claim 2 further comprising the steps of: sensing the temperature of the heat exchanger; energizing the circulation blower when the heat exchanger reaches a first predetermined temperature; regulating the burner to maintain a second predetermined temperature, said second predetermined temperature being higher than said first predetermined; de-energizing the burner when said heating request is satisfied; de-energizing the circulation blower when said heat exchanger cools to said first predetermined temperature.
Claim 6
Independent Claim
143 words
A method for regulating circulation blower setpoints to maintain constant pressure in a forced air zoned heating system the forced air furnace having return ducts, a heat exchanger, warm air ducts, a circulation blower, and a burner, comprising the steps of: receiving a heating request from an external controller; energizing the burner in the furnace to heat the heat exchanger; energizing the circulation blower; sensing the pressure in the heat exchanger; regulating the circulation blower at a circulation setpoint to maintain a constant pressure in the heat exchanger; measuring cycle "on " time of said furnace; increasing said circulation blower setpoint to maintain a second constant pressure if said "on " time increases; decreasing said circulation blower setpoint to maintain a third constant pressure if said "on " time decreases; de-energizing the burner and the circulation blower when said heating request is satisfied.
Claim 7
Independent Claim
143 words
A method for regulating circulation blower setpoints to maintain constant pressure in a forced air zoned heating system the forced air furnace having return ducts, a heat exchanger, warm air ducts, a circulation blower, and a burner, comprising the steps of: receiving a heating request from an external controller; energizing the burner in the furnace to heat the heat exchanger; energizing the circulation blower; sensing the pressure in the heat exchanger; regulating the circulation blower at a circulation setpoint to maintain a constant pressure in the heat exchanger; measuring cycle "on " time of said furnace; increasing said circulation blower setpoint to maintain a second constant pressure if said "on " time increases; decreasing said circulation blower setpoint to maintain a third constant pressure if said "on " time decreases; de-energizing the burner and the circulation blower when said heating request is satisfied.
Claim 8
Dependent Claim
81 words
The method for regulating circulation blower setpoints of claim 4 further comprising the steps of: sensing the temperature of the heat exchanger; energizing the circulation blower when the air temperature in the heat exchanger reaches a first predetermined temperature; regulating the burner to maintain a second predetermined temperature, said second predetermined temperature being higher than said first predetermined; de-energizing the burner when said heating request is satisfied; de-energizing the circulation blower when said heat exchanger cools to said first predetermined temperature.
Claim 9
Dependent Claim
255 words
A furnace control for a forced air control heating system for multi-zone heating, the forced air furnace having return ducts, a heat exchanger, warm air ducts, a circulation blower, and a burner, the forced air furnace receiving the heating requests for external control means, wherein said furnace provides heat to at least one zone to be heated, the burner heating the heat exchanger, the circulation blower forcing air from the return ducts through the heat exchanger and out the warm air duct to the zone to be heated, said furnace control comprising: temperature sensor for sensing the temperature of the heat exchanger; regulation means for regulating the burner, said temperature sensor providing a signal representative of the air temperature in the heat exchanger to said regulation means, said regulation means regulating the burner such that said heat exchanger is held to a constant temperature after reaching a preset temperature during the external controller request for heat; a pressure sensor for measuring the pressure in the heat exchanger; a controller for controlling the circulation blower, said pressure sensing means providing a signal representative of said pressure in the heat exchanger to said controller, said controller regulating the circulation blower wherein said pressure in the heat exchanger is held constant; and wherein said controller further comprises timing means, wherein said furnace satisfies said request for heat in a period of time, wherein said timing means times said period of time, said controller increasing said pressure if said period of time is greater than a first predetermined time.
Claim 10
Dependent Claim
255 words
A furnace control for a forced air control heating system for multi-zone heating, the forced air furnace having return ducts, a heat exchanger, warm air ducts, a circulation blower, and a burner, the forced air furnace receiving the heating requests for external control means, wherein said furnace provides heat to at least one zone to be heated, the burner heating the heat exchanger, the circulation blower forcing air from the return ducts through the heat exchanger and out the warm air duct to the zone to be heated, said furnace control comprising: temperature sensor for sensing the temperature of the heat exchanger; regulation means for regulating the burner, said temperature sensor providing a signal representative of the air temperature in the heat exchanger to said regulation means, said regulation means regulating the burner such that said heat exchanger is held to a constant temperature after reaching a preset temperature during the external controller request for heat; a pressure sensor for measuring the pressure in the heat exchanger; a controller for controlling the circulation blower, said pressure sensing means providing a signal representative of said pressure in the heat exchanger to said controller, said controller regulating the circulation blower wherein said pressure in the heat exchanger is held constant; and wherein said controller further comprises timing means, wherein said furnace satisfies said request for heat in a period of time, wherein said timing means times said period of time, said controller increasing said pressure if said period of time is greater than a first predetermined time.
Claim 11
Dependent Claim
24 words
The furnace control of claim 6 wherein said controller decreases said pressure if said period of time is less than a second predetermined time.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-02 | 1997-11-01 | 1998-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-02 | 2001-11-01 | 2002-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-02 | 2005-11-01 | 2006-05-03 | $7700.00 | Window Closed / Lapsed |