CA2126141A1 - Limit Switch Control Especially for Warm Air Furnaces - Google Patents
Limit Switch Control Especially for Warm Air FurnacesInfo
- Publication number
- CA2126141A1 CA2126141A1 CA2126141A CA2126141A CA2126141A1 CA 2126141 A1 CA2126141 A1 CA 2126141A1 CA 2126141 A CA2126141 A CA 2126141A CA 2126141 A CA2126141 A CA 2126141A CA 2126141 A1 CA2126141 A1 CA 2126141A1
- Authority
- CA
- Canada
- Prior art keywords
- limit switch
- furnace
- switch control
- warm air
- control especially
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/06—Regulating fuel supply conjointly with draught
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2223/00—Signal processing; Details thereof
- F23N2223/08—Microprocessor; Microcomputer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/10—Measuring temperature stack temperature
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/02—Ventilators in stacks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/10—Ventilators forcing air through heat exchangers
Abstract
A control system to control the operation of a furnace (10) having a fuel control unit (26) to supply fuel to a burner (24) includes a limit switch (48) within furnace (10) to detect an overheated condition. The limit switch (48) opens when a reference temperature is reached, shutting down the furnace (10). A logic unit (40) senses the state of the limit switch (48) and measures the shutdown period, and notes whether the shutdown period exceeds a predetermined interval. The logic unit (40) opens a lockout switch (38') that controls the fuel control unit (26) if the furnace is subject to a number of consecutive prolonged shutdowns that exceeds a predetermined limit.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/165,354 US5377909A (en) | 1993-12-10 | 1993-12-10 | Limit switch control especially for warm air furnaces |
US08/165,354 | 1993-12-10 |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2126141A1 true CA2126141A1 (en) | 1995-06-11 |
CA2126141C CA2126141C (en) | 1999-01-12 |
Family
ID=22598553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002126141A Expired - Fee Related CA2126141C (en) | 1993-12-10 | 1994-06-17 | Limit switch control especially for warm air furnaces |
Country Status (2)
Country | Link |
---|---|
US (1) | US5377909A (en) |
CA (1) | CA2126141C (en) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5520327A (en) * | 1994-09-23 | 1996-05-28 | Carrier Corporation | Electronic thermostat having safety feature |
US5865611A (en) * | 1996-10-09 | 1999-02-02 | Rheem Manufacturing Company | Fuel-fired modulating furnace calibration apparatus and methods |
US5971284A (en) * | 1997-03-25 | 1999-10-26 | Intellidyne, Llc | Apparatus for regulating heater cycles to improve forced-air heating system efficiency |
US5984003A (en) * | 1998-10-22 | 1999-11-16 | Emerson Electric Co. | System and method for controlling operation of a multi-speed circulation blower in a heating and cooling apparatus |
US20060275719A1 (en) * | 2005-06-07 | 2006-12-07 | Honeywell International Inc. | Warm air furnace baselining and diagnostic enhancements using rewritable non-volatile memory |
US20110271880A1 (en) * | 2010-05-04 | 2011-11-10 | Carrier Corporation | Redundant Modulating Furnace Gas Valve Closure System and Method |
US9915435B2 (en) | 2015-08-21 | 2018-03-13 | Google Llc | Intelligent HVAC control including automatic furnace shutdown event processing |
US10215438B2 (en) | 2015-09-03 | 2019-02-26 | Carrier Corporation | System and method of determining a limit fault in an HVAC unit |
US10845064B2 (en) * | 2017-02-15 | 2020-11-24 | Johnson Controls Technology Company | Heating, ventilation, and air conditioning control system |
CN116880896B (en) * | 2023-09-06 | 2024-01-09 | 山东天岳先进科技股份有限公司 | Recovery method, system, terminal and storage medium of crystal growth furnace control machine |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3549088A (en) * | 1969-05-08 | 1970-12-22 | Texas Instruments Inc | Electrothermal furnace control |
US3921899A (en) * | 1974-07-19 | 1975-11-25 | Clair Hamilton | Electronic furnace control system |
US4140274A (en) * | 1977-05-11 | 1979-02-20 | Nabinger Herman G | Control device for a warm air furnace |
NL7907138A (en) * | 1979-09-26 | 1981-03-30 | Neom Bv | Central heating control system - uses electronic logic to control operation of fuel valve, fan and alarm |
US4408711A (en) * | 1980-11-14 | 1983-10-11 | Levine Michael R | Thermostat with adaptive operating cycle |
US4502625A (en) * | 1983-08-31 | 1985-03-05 | Honeywell Inc. | Furnace control apparatus having a circulator failure detection circuit for a downflow furnace |
US4667874A (en) * | 1985-07-23 | 1987-05-26 | Harold R. Johnson | Energy saving furnace controller |
US4792089A (en) * | 1985-11-26 | 1988-12-20 | Carrier Corporation | Self-correcting microprocessor control system and method for a furnace |
US4638942A (en) * | 1985-12-02 | 1987-01-27 | Carrier Corporation | Adaptive microprocessor control system and method for providing high and low heating modes in a furnace |
US4815524A (en) * | 1987-06-29 | 1989-03-28 | Carrier Corporation | Control system for a furnace operating in the continuous blower mode |
US4887767A (en) * | 1988-10-21 | 1989-12-19 | Carrier Corporation | Limit switch control method for a two-stage furnace |
US4951870A (en) * | 1990-02-21 | 1990-08-28 | Carrier Corporation | Overtemperature control |
US5197664A (en) * | 1991-10-30 | 1993-03-30 | Inter-City Products Corporation (Usa) | Method and apparatus for reducing thermal stress on heat exchangers |
-
1993
- 1993-12-10 US US08/165,354 patent/US5377909A/en not_active Expired - Lifetime
-
1994
- 1994-06-17 CA CA002126141A patent/CA2126141C/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
US5377909A (en) | 1995-01-03 |
CA2126141C (en) | 1999-01-12 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request | ||
MKLA | Lapsed |