Safety circuit for furnace
There is disclosed a modification in the control circuitry of a gas furnace having a primary or main limit whereby the primary circuit subsumes the functions of a the secondary or manual reset limit circuit. The control circuit incorporates a microprocessor capable of sensing conditions in the furna...
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| creator | WHITAKER MARK T SWILIK, JR. ROBERT C |
| description | There is disclosed a modification in the control circuitry of a gas furnace having a primary or main limit whereby the primary circuit subsumes the functions of a the secondary or manual reset limit circuit. The control circuit incorporates a microprocessor capable of sensing conditions in the furnace, enabling and disabling the various furnace components. When an overtemperature condition is sensed the furnace is thereupon disabled by a process that executes in the microprocessor and comprises the repeated steps of: sensing if the limit switch is open; determining, in the event that the limit switch is open, whether the limit switch remains open for a period that exceeds a predetermined time interval; incrementing a cycle count in the event that the limit switch has remained open for the predetermined time period; waiting for the limit switch to reset in the event that the incremented cycle count does not exceed a predetermined value, and reinitiating the combustion cycle if the step of waiting was performed; and disabling the furnace in the event that the incremented cycle count exceeds the predetermined value. |
| format | Patent |
| fullrecord | <record><control><sourceid>epo_EVB</sourceid><recordid>TN_cdi_epo_espacenet_US5372120A</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><sourcerecordid>US5372120A</sourcerecordid><originalsourceid>FETCH-epo_espacenet_US5372120A3</originalsourceid><addsrcrecordid>eNrjZJAKTkxLLalUSM4sSi7NLFFIyy9SSCstyktMTuVhYE1LzClO5YXS3Azybq4hzh66qQX58anFBUAleakl8aHBpsbmRoZGBo7GhFUAAMBiIj0</addsrcrecordid><sourcetype>Open Access Repository</sourcetype><iscdi>true</iscdi><recordtype>patent</recordtype></control><display><type>patent</type><title>Safety circuit for furnace</title><source>esp@cenet</source><creator>WHITAKER; MARK T ; SWILIK, JR.; ROBERT C</creator><creatorcontrib>WHITAKER; MARK T ; SWILIK, JR.; ROBERT C</creatorcontrib><description>There is disclosed a modification in the control circuitry of a gas furnace having a primary or main limit whereby the primary circuit subsumes the functions of a the secondary or manual reset limit circuit. The control circuit incorporates a microprocessor capable of sensing conditions in the furnace, enabling and disabling the various furnace components. When an overtemperature condition is sensed the furnace is thereupon disabled by a process that executes in the microprocessor and comprises the repeated steps of: sensing if the limit switch is open; determining, in the event that the limit switch is open, whether the limit switch remains open for a period that exceeds a predetermined time interval; incrementing a cycle count in the event that the limit switch has remained open for the predetermined time period; waiting for the limit switch to reset in the event that the incremented cycle count does not exceed a predetermined value, and reinitiating the combustion cycle if the step of waiting was performed; and disabling the furnace in the event that the incremented cycle count exceeds the predetermined value.</description><edition>5</edition><language>eng</language><subject>BLASTING ; COMBUSTION APPARATUS ; COMBUSTION PROCESSES ; FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEATGENERATING MEANS, IN GENERAL ; HEATING ; LIGHTING ; MECHANICAL ENGINEERING ; RANGES ; REGULATING OR CONTROLLING COMBUSTION ; VENTILATING ; WEAPONS</subject><creationdate>1994</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19941213&DB=EPODOC&CC=US&NR=5372120A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76289</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19941213&DB=EPODOC&CC=US&NR=5372120A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>WHITAKER; MARK T</creatorcontrib><creatorcontrib>SWILIK, JR.; ROBERT C</creatorcontrib><title>Safety circuit for furnace</title><description>There is disclosed a modification in the control circuitry of a gas furnace having a primary or main limit whereby the primary circuit subsumes the functions of a the secondary or manual reset limit circuit. The control circuit incorporates a microprocessor capable of sensing conditions in the furnace, enabling and disabling the various furnace components. When an overtemperature condition is sensed the furnace is thereupon disabled by a process that executes in the microprocessor and comprises the repeated steps of: sensing if the limit switch is open; determining, in the event that the limit switch is open, whether the limit switch remains open for a period that exceeds a predetermined time interval; incrementing a cycle count in the event that the limit switch has remained open for the predetermined time period; waiting for the limit switch to reset in the event that the incremented cycle count does not exceed a predetermined value, and reinitiating the combustion cycle if the step of waiting was performed; and disabling the furnace in the event that the incremented cycle count exceeds the predetermined value.</description><subject>BLASTING</subject><subject>COMBUSTION APPARATUS</subject><subject>COMBUSTION PROCESSES</subject><subject>FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEATGENERATING MEANS, IN GENERAL</subject><subject>HEATING</subject><subject>LIGHTING</subject><subject>MECHANICAL ENGINEERING</subject><subject>RANGES</subject><subject>REGULATING OR CONTROLLING COMBUSTION</subject><subject>VENTILATING</subject><subject>WEAPONS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1994</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZJAKTkxLLalUSM4sSi7NLFFIyy9SSCstyktMTuVhYE1LzClO5YXS3Azybq4hzh66qQX58anFBUAleakl8aHBpsbmRoZGBo7GhFUAAMBiIj0</recordid><startdate>19941213</startdate><enddate>19941213</enddate><creator>WHITAKER; MARK T</creator><creator>SWILIK, JR.; ROBERT C</creator><scope>EVB</scope></search><sort><creationdate>19941213</creationdate><title>Safety circuit for furnace</title><author>WHITAKER; MARK T ; SWILIK, JR.; ROBERT C</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US5372120A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1994</creationdate><topic>BLASTING</topic><topic>COMBUSTION APPARATUS</topic><topic>COMBUSTION PROCESSES</topic><topic>FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEATGENERATING MEANS, IN GENERAL</topic><topic>HEATING</topic><topic>LIGHTING</topic><topic>MECHANICAL ENGINEERING</topic><topic>RANGES</topic><topic>REGULATING OR CONTROLLING COMBUSTION</topic><topic>VENTILATING</topic><topic>WEAPONS</topic><toplevel>online_resources</toplevel><creatorcontrib>WHITAKER; MARK T</creatorcontrib><creatorcontrib>SWILIK, JR.; ROBERT C</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>WHITAKER; MARK T</au><au>SWILIK, JR.; ROBERT C</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Safety circuit for furnace</title><date>1994-12-13</date><risdate>1994</risdate><abstract>There is disclosed a modification in the control circuitry of a gas furnace having a primary or main limit whereby the primary circuit subsumes the functions of a the secondary or manual reset limit circuit. The control circuit incorporates a microprocessor capable of sensing conditions in the furnace, enabling and disabling the various furnace components. When an overtemperature condition is sensed the furnace is thereupon disabled by a process that executes in the microprocessor and comprises the repeated steps of: sensing if the limit switch is open; determining, in the event that the limit switch is open, whether the limit switch remains open for a period that exceeds a predetermined time interval; incrementing a cycle count in the event that the limit switch has remained open for the predetermined time period; waiting for the limit switch to reset in the event that the incremented cycle count does not exceed a predetermined value, and reinitiating the combustion cycle if the step of waiting was performed; and disabling the furnace in the event that the incremented cycle count exceeds the predetermined value.</abstract><edition>5</edition><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| subjects | BLASTING COMBUSTION APPARATUS COMBUSTION PROCESSES FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEATGENERATING MEANS, IN GENERAL HEATING LIGHTING MECHANICAL ENGINEERING RANGES REGULATING OR CONTROLLING COMBUSTION VENTILATING WEAPONS |
| title | Safety circuit for furnace |
| url | https://sfx.bib-bvb.de/sfx_tum?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&ctx_tim=2025-02-04T14%3A36%3A08IST&url_ver=Z39.88-2004&url_ctx_fmt=infofi/fmt:kev:mtx:ctx&rfr_id=info:sid/primo.exlibrisgroup.com:primo3-Article-epo_EVB&rft_val_fmt=info:ofi/fmt:kev:mtx:patent&rft.genre=patent&rft.au=WHITAKER;%20MARK%20T&rft.date=1994-12-13&rft_id=info:doi/&rft_dat=%3Cepo_EVB%3EUS5372120A%3C/epo_EVB%3E%3Curl%3E%3C/url%3E&disable_directlink=true&sfx.directlink=off&sfx.report_link=0&rft_id=info:oai/&rft_id=info:pmid/&rfr_iscdi=true |