{"id":11523,"date":"2024-06-19T11:20:50","date_gmt":"2024-06-19T11:20:50","guid":{"rendered":"https:\/\/topat10.com\/?p=11523"},"modified":"2024-06-19T11:20:50","modified_gmt":"2024-06-19T11:20:50","slug":"heat-pump-thermostat-wiring-diagram","status":"publish","type":"post","link":"https:\/\/topat10.com\/?p=11523","title":{"rendered":"Heat Pump Thermostat Wiring Diagram"},"content":{"rendered":"<p> <br \/>\n<\/p>\n<div>\n<p>If you are looking for a better understanding of heat pump thermostat wiring, here is an example of a typical electronic type heat pump control wiring that is located inside your house.<\/p>\n<p>There are many types of smart programmable thermostats on the market, so please check that you can replace the type of thermostat that you are using with a newer one. You can buy a new programmable heat pump thermostat for less than $100.<\/p>\n<h2 class=\"wp-block-heading\">Getting Started with Heat Pump Thermostat Wiring<\/h2>\n<p>Normally, an electronic thermostat in the United States is powered by a 24V AC power source, which comes from a 110V\/24V power transformer. If you are not sure, always refer to the operating manual of the thermostat in your house before trying to do any troubleshooting or replacement work. As always, if you are not trained to handle electrical equipment, please get a qualified HVAC technician to do it.<\/p>\n<p>It is always a good idea to take a picture of the current HVAC system thermostat wiring before you start removing them. That way, you know where the wiring colors go for reference.<\/p>\n<p>In the heat pump system, there are at least 8 wires that need to be connected to the thermostat for proper operation. Watch this video from AC Service Tech LLC for a quick overview of each color-coded wire:<\/p>\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\">\n<div class=\"wp-block-embed__wrapper\">\n<noscript><\/p>\n<div class=\"jlvid_container\"><iframe title=\"Heat Pump Thermostat Wiring Explained! Colors, Terminals, Functions, Circuit Path!\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/tf2OxCDwlFY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p><\/noscript>\n<\/div>\n<\/figure>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">Will Any Smart Thermostat Work With a Heat Pump?<\/h2>\n<p>Not all smart thermostats are compatible with heat pumps. While you\u2019re shopping, be sure to pick one that specifically supports heat pumps. Look for thermostats that have the necessary wiring terminals, such as the O\/B terminal for the reversing valve, and ensure that the thermostat\u2019s software is designed to control heat pump operation efficiently.<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\" id=\"h-overview-of-different-heat-pump-terminals\">Overview of Different Heat Pump Terminals<\/h2>\n<div class=\"gb-grid-wrapper gb-grid-wrapper-5b91010b\">\n<div class=\"gb-grid-column gb-grid-column-67e6b79d\">\n<div class=\"gb-container gb-container-67e6b79d\">\n<p>As shown in the diagram, you will need to power up the thermostat, and the 24V AC power is connected to the\u00a0<strong>R<\/strong>\u00a0and\u00a0<strong>C<\/strong>\u00a0terminals. The color of wire\u00a0R\u00a0is usually\u00a0<strong>RED wire,<\/strong>\u00a0and\u00a0C\u00a0is\u00a0<strong>BLACK<\/strong> wire.\u00a0The C\u00a0wire is known as the common wire. These two connections will ensure that there is power to the thermostat that you are operating.\u00a0<\/p>\n<p>The\u00a0<strong>Y<\/strong>\u00a0terminal is where the signal to the cooling air conditioner signal is connected. This terminal will call for the need to cool the room when the set temperature is lower than the room temperature. The\u00a0<strong>G<\/strong>\u00a0terminal is connected to the indoor fan with the green wire, which circulates the air in the room.<\/p>\n<\/div>\n<\/div>\n<div class=\"gb-grid-column gb-grid-column-cf35ff1e\">\n<div class=\"gb-container gb-container-cf35ff1e\">\n<figure class=\"gb-block-image gb-block-image-97588f4d\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"420\" height=\"343\" class=\"gb-image gb-image-97588f4d lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" title=\"ezgif-4-ed88576113\" data-lazy-data-sizes=\"auto\" data-srcset=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/ezgif-4-ed88576113-e1694696752214.jpeg 420w, https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/ezgif-4-ed88576113-e1694696752214-300x245.jpeg 300w\" data-lazy-data-sizes=\"(max-width: 420px) 100vw, 420px\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/ezgif-4-ed88576113-e1694696752214.jpeg\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"420\" height=\"343\" class=\"gb-image gb-image-97588f4d lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/ezgif-4-ed88576113-e1694696752214.jpeg\" alt=\"\" title=\"ezgif-4-ed88576113\" data-sizes=\"auto\" data-srcset=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/ezgif-4-ed88576113-e1694696752214.jpeg 420w, https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/ezgif-4-ed88576113-e1694696752214-300x245.jpeg 300w\" data-sizes=\"(max-width: 420px) 100vw, 420px\"\/><\/noscript><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<p class=\"gb-headline gb-headline-ec73fb3a gb-headline-text\">The reversing valve is a device that reverses the flow of the refrigerant in the piping system. Usually, the reversing valve is energized when running cool mode. However, there are models where the reversing valve is off when running cool mode.<\/p>\n<p>Therefore, it is important the check the manufacturer\u2019s specifications of the heat pump system that you are using before you can make a proper connection to the thermostat.<\/p>\n<p>The\u00a0<strong>O<\/strong>\u00a0terminal connects to the orange wire and is used when the system that you are using has a reversing valve (or four-way valve), which activates when running cooling mode. If the reversing valve is turned on when running heat mode, you will need to connect the reversing valve to\u00a0the <strong>B<\/strong>\u00a0terminal. Only one connection is active at any one time, that is either\u00a0<strong>O<\/strong>\u00a0or\u00a0<strong>B<\/strong>\u00a0terminal is used but not both.<\/p>\n<p>In some equipment, there is a 2nd stage of cooling that helps to increase the cooling capacity of the room. In this case, the terminal\u00a0<strong>Y2<\/strong>\u00a0is usually used. The color of the wire varies.\u00a0<\/p>\n<p>Sometimes, there is a 2nd stage of heating where additional heating is provided to supplement the primary heating system. This is usually installed in regions where extreme winter occurs. In this case, the terminal\u00a0<strong>W2<\/strong>\u00a0will be present.<\/p>\n<p>Related: <a href=\"https:\/\/todayshomeowner.com\/hvac\/guides\/what-does-hold-mean-on-thermostat\/\">What Does Hold Mean on a Thermostat?<\/a><\/p>\n<section id=\"th-tips-block_7df8358c1c5a5079e222db3480253cc3\" class=\"th-block th-tips\" style=\"color: ; background-color: ;\">\n<div class=\"thTipsContainer\">\n<p>Today\u2019s Homeowner Tips<\/p>\n<p>Some thermostats may have a feature called Emergency Heat or Auxiliary Heat, which, when set, will shut off the heat pump. It will then turn on an electric heat strip, which becomes the primary heat source. This feature should only be used for a while as the energy cost is usually higher than a heat pump system. The terminal used is E.<\/p>\n<\/p><\/div>\n<\/section>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"gb-headline gb-headline-242b8a05 gb-headline-text\">Features To Look For in Heat Pump Thermostats<\/h2>\n<p>Look out for the following features that are incorporated in most modern programmable heat pump thermostats.<\/p>\n<ul>\n<li>Low voltage checking prompts you that the incoming power is low.<\/li>\n<li>Error codes that tell you the reason why your system is not running properly.<\/li>\n<li>3-minutes minimum compressor off time to prevent the short cycling of the compressor. Short cycling of the compressor will shorten its lifetime.<\/li>\n<li>Programmable day and night settings of the set temperature.<\/li>\n<li>Weekend settings and setback functions for vacations.<\/li>\n<li>Ability to check the status of the thermostat and control the settings remotely via smartphones or computers. The presence of this feature will raise the cost of the thermostat.<\/li>\n<\/ul>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\">Final Thoughts<\/h2>\n<p>Before purchasing a new thermostat for your heat pump, homeowners need to make sure the model they purchase is compatible with heat pumps (and not just a furnace\/air conditioner combo). Once you have a compatible model with your heating and cooling system, use the above chart and color coding to properly DIY wire your new thermostat to your heat pump. Thankfully, many manufacturers and installers are moving to a universal contact block that just snaps all wires into the back of the thermostat. In this case, all you have to do is remove a single plug from the old thermostat and insert it into the new one. If you have any issues, get help from a local HVAC technician.<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<div id=\"hm-faq-block_69e5d1688eb615135d46a74d628562db 1\" class=\"hm-faq hm-faq--two-column\">\n<h2 class=\"hm-faq__title \" data-toc-text=\"Frequently Asked Questions\">Frequently Asked Questions<\/h2>\n<div class=\"hm-faq__item\">\n<h3 class=\"faqQuestion accordion mb-0\">\n                        Can I replace my old heat pump thermostat with a new programmable one?                    <\/h3>\n<div class=\"faqAnswer panel\">\n<p>Yes, you can replace your old heat pump thermostat with a new programmable or smart one. Just double-check that the new thermostat is compatible with your heat pump and has the necessary wiring terminals.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<hr class=\"my-2\"\/>\n<div class=\"hm-faq__item\">\n<h3 class=\"faqQuestion accordion mb-0\">\n                        What should I do if my heat pump thermostat is not working properly?                    <\/h3>\n<div class=\"faqAnswer panel\">\n<p>If it doesn\u2019t work, check the wiring for any loose connections or damaged wires. If the issue persists, look at the thermostat\u2019s manual for troubleshooting tips or contact an HVAC technician for assistance.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<hr class=\"my-2\"\/>\n<div class=\"hm-faq__item\">\n<h3 class=\"faqQuestion accordion mb-0\">\n                        Can I install a heat pump thermostat myself, or do I need a professional                    <\/h3>\n<div class=\"faqAnswer panel\">\n<p>Yes, you can install it yourself. However, if you\u2019re not comfortable messing with wires, I recommend hiring an HVAC company to do it for you.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<hr class=\"my-2\"\/>\n                    <\/div>\n<div class=\"gb-container gb-container-582f500d\">\n<p>Article Update Log<\/p>\n<div class=\"gb-grid-wrapper gb-grid-wrapper-4ccf9a66\">\n<div class=\"gb-grid-column gb-grid-column-a62d97de\">\n<div class=\"gb-container gb-container-a62d97de\">\n<div class=\"gb-headline gb-headline-1a89dba4 gb-headline-text provider-box\">Reviewed for accuracy, cost data, industry best practices, and expert advice by <a href=\"https:\/\/todayshomeowner.com\/author\/jjachura\/\" target=\"_blank\" rel=\"noreferrer noopener\">Jonathon Jachura<\/a>.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>If you are looking for a better understanding of heat pump thermostat wiring, here is an example of a typical electronic type heat pump control wiring that is located inside your house. There are many types of smart programmable thermostats on the market, so please check that you can replace the type of thermostat that [&hellip;]<\/p>\n","protected":false},"author":222,"featured_media":11524,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[124],"tags":[],"class_list":["post-11523","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-home-improvement"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Heat Pump Thermostat Wiring Diagram | Unlock Informed Choices with Us<\/title>\n<meta name=\"description\" content=\"Learn the color codes of a typical heat pump thermostat Wiring in your house. 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There are many types of smart programmable thermostats on the market, so please check that you can replace the type of thermostat that&hellip;","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/topat10.com\/index.php?rest_route=\/wp\/v2\/posts\/11523","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/topat10.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/topat10.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/topat10.com\/index.php?rest_route=\/wp\/v2\/users\/222"}],"replies":[{"embeddable":true,"href":"https:\/\/topat10.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=11523"}],"version-history":[{"count":0,"href":"https:\/\/topat10.com\/index.php?rest_route=\/wp\/v2\/posts\/11523\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/topat10.com\/index.php?rest_route=\/wp\/v2\/media\/11524"}],"wp:attachment":[{"href":"https:\/\/topat10.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11523"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/topat10.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11523"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/topat10.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}