{"id":99,"date":"2018-11-30T10:40:51","date_gmt":"2018-11-30T16:40:51","guid":{"rendered":"https:\/\/www.ableheatcool.biz\/hvac-blog\/?p=99"},"modified":"2018-11-30T10:40:51","modified_gmt":"2018-11-30T16:40:51","slug":"heating-equipment-limit-switches","status":"publish","type":"post","link":"https:\/\/www.ableheatcool.biz\/hvac-blog\/heating-equipment-limit-switches\/","title":{"rendered":"Heating Equipment Limit Switches"},"content":{"rendered":"

1) What\u2019s a Limit Switch?<\/strong><\/p>\n

\"\"Limit switches are components in every piece of heating equipment, be it gas furnaces or air handlers with electric heat.<\/p>\n

2) Are Limit Switches Important?<\/strong><\/p>\n

Yes, especially the high limit switch.\u00a0 It\u2019s named appropriately and is a safety measure to turn off the gas furnace or AHU with electric heat strips if the temperature inside the unit goes above the degree limit of the switch.\u00a0 Example: 160* degree limit switch is in place; the blower motor stops working and stops moving air through the unit. However, the flames are still on or the electric heat strips are still on and the temperature continues to rise.\u00a0 When the inside of the unit reaches the high limit of 160*, the switch turns off the unit.<\/p>\n

3) \u00a0Common Limit Switches<\/strong><\/p>\n

High limit switch \u2013 <\/strong>discussed above
\nFan Control limit switch <\/strong>\u2013 The fan control switch monitors the temperature inside the heating equipment.\u00a0 When the desired temperature is reached, the fan switch turns on the blower motor to push warm, cozy air through the ducts and out the registers.<\/p>\n

Causes that Trip a Limit Switch:<\/strong><\/p>\n

A dirty\/clogged filter \u2013 restricts and blocks proper air flow into the furnace or AHU and will cause the temperature to rise.\u00a0 If the temperature raises high enough, the High limit switch will trip and will shut off the unit. Check the filter regularly and change it as needed.<\/p>\n

The blower motor \u2013 check if the blower motor is working\u2026is air moving out of the registers?\u00a0 \u00a0Manually change the thermostat fan setting from \u201cauto\u201d to the \u201con\u201d position and check air flow from the registers.\u00a0 If the blower motor is not working and no air is being blown through the furnace or AHU, it will reach the \u201cdegree limit\u201d of the switch and the high limit switch will trip, shutting off the unit.<\/p>\n

There are many parts and controls working together to keep that comfortable warm temperature in our homes. If the filter is clean and the blower motor is working, a limit switch can wear out and fail. \u00a0There is always a reason that causes limit switches to trip and it may be time to call for a furnace repair service <\/a>professional to thoroughly check the heating equipment for safety and proper operation.<\/p>\n","protected":false},"excerpt":{"rendered":"

1) What\u2019s a Limit Switch? Limit switches are components in every piece of heating equipment, be it gas furnaces or air handlers with electric heat. 2) Are Limit Switches Important? Yes, especially the high limit switch.\u00a0 It\u2019s named appropriately and is a safety measure to turn off the gas furnace or AHU with electric heat strips if the temperature inside the unit goes above the degree limit of the switch.\u00a0 Example: 160* degree limit switch is in place; the blower … Continue reading Heating Equipment Limit Switches<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-99","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHeating Equipment Limit Switches - ABLE Heat and Cool - HVAC Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ableheatcool.biz\/hvac-blog\/heating-equipment-limit-switches\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Heating Equipment Limit Switches - ABLE Heat and Cool - HVAC Blog\" \/>\n<meta property=\"og:description\" content=\"1) What\u2019s a Limit Switch? Limit switches are components in every piece of heating equipment, be it gas furnaces or air handlers with electric heat. 2) Are Limit Switches Important? Yes, especially the high limit switch.\u00a0 It\u2019s named appropriately and is a safety measure to turn off the gas furnace or AHU with electric heat strips if the temperature inside the unit goes above the degree limit of the switch.\u00a0 Example: 160* degree limit switch is in place; the blower … Continue reading Heating Equipment Limit Switches\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ableheatcool.biz\/hvac-blog\/heating-equipment-limit-switches\/\" \/>\n<meta property=\"og:site_name\" content=\"ABLE Heat and Cool - HVAC Blog\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/ABLEheatcool\" \/>\n<meta property=\"article:published_time\" content=\"2018-11-30T16:40:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.ableheatcool.biz\/hvac-blog\/wp-content\/uploads\/Bryant-Furnace-3.jpg\" \/>\n<meta name=\"author\" content=\"ABLEHeatCool\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@ableheatandcool\" \/>\n<meta name=\"twitter:site\" content=\"@ableheatandcool\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.ableheatcool.biz\\\/hvac-blog\\\/heating-equipment-limit-switches\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.ableheatcool.biz\\\/hvac-blog\\\/heating-equipment-limit-switches\\\/\"},\"author\":{\"name\":\"ABLEHeatCool\",\"@id\":\"https:\\\/\\\/www.ableheatcool.biz\\\/hvac-blog\\\/#\\\/schema\\\/person\\\/2d6027751f6103f0222d4ded93619862\"},\"headline\":\"Heating Equipment Limit Switches\",\"datePublished\":\"2018-11-30T16:40:51+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.ableheatcool.biz\\\/hvac-blog\\\/heating-equipment-limit-switches\\\/\"},\"wordCount\":379,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/www.ableheatcool.biz\\\/hvac-blog\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/www.ableheatcool.biz\\\/hvac-blog\\\/heating-equipment-limit-switches\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.ableheatcool.biz\\\/hvac-blog\\\/wp-content\\\/uploads\\\/Bryant-Furnace-3.jpg\",\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.ableheatcool.biz\\\/hvac-blog\\\/heating-equipment-limit-switches\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.ableheatcool.biz\\\/hvac-blog\\\/heating-equipment-limit-switches\\\/\",\"url\":\"https:\\\/\\\/www.ableheatcool.biz\\\/hvac-blog\\\/heating-equipment-limit-switches\\\/\",\"name\":\"Heating Equipment Limit Switches - 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