{"id":11128,"date":"2024-05-23T02:20:50","date_gmt":"2024-05-23T02:20:50","guid":{"rendered":"https:\/\/topat10.com\/?p=11128"},"modified":"2024-05-23T02:20:50","modified_gmt":"2024-05-23T02:20:50","slug":"hvac-symbols-and-their-meanings","status":"publish","type":"post","link":"https:\/\/topat10.com\/?p=11128","title":{"rendered":"HVAC Symbols and Their Meanings"},"content":{"rendered":"<p> <br \/>\n<\/p>\n<div>\n<p>When troubleshooting a malfunctioning HVAC system, it\u2019s important to understand HVAC symbols. These symbols, found in electrical and electronic schematics, guide the design and repair of the system\u2019s circuit boards and wiring. You can become familiar with these symbols by reading your HVAC system manual. Interpreting HVAC symbols allows you to accurately interpret circuit diagrams, identify issues, and make decisions regarding the repair of your HVAC system<\/p>\n<p>HVAC schematics, including circuit diagrams or schematic diagrams feature mostly universal symbols. There are some variations between regions like Europe and North America. Mastering these HVAC symbols and their functions will help you with troubleshooting your HVAC system. This article provides you with common HVAC symbols and their meanings to support you in diagnosing your HVAC system issues.<\/p>\n<h2 class=\"wp-block-heading\" id=\"h-what-are-hvac-symbols\">What are HVAC Symbols?<\/h2>\n<p>Symbols are used in the construction trade for all different types of things like plumbing systems and HVAC systems. HVAC symbols can quickly show what something means without using lots of words or complicated terms. Abbreviations of complicated terms are often used with symbols. <\/p>\n<p>Some common symbols used in all HVAC system plans include HVAC ductwork, compressor and supply air fans.<\/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=\"Electric symbols for HVAC\" width=\"1170\" height=\"658\" src=\"https:\/\/www.youtube.com\/embed\/tkYC1ayn8Kc?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<p class=\"gb-headline gb-headline-e9d1e946 gb-headline-text\">Understanding the function of each HVAC system component helps you accurately diagnose the problem you\u2019re facing. Here are some of the commonly used HVAC symbols related to the schematics and electronic components of your HVAC system.<\/p>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<h2 class=\"wp-block-heading\" id=\"h-typical-hvac-symbols-in-circuit-diagram\">Typical HVAC Symbols in Circuit Diagram<\/h2>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"237\" height=\"105\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199436 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-5.webp\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"237\" height=\"105\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-5.webp\" alt=\"\" class=\"wp-image-199436 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Resistor\u00a0is a common part that is used in any printed circuit board. This passive part resists the flow of current. Change to similar value and rating if burnt.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"234\" height=\"126\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199437 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-1-3.webp\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"234\" height=\"126\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-1-3.webp\" alt=\"\" class=\"wp-image-199437 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>A variable resistor or potentiometer is a resistor whose resistance can be adjusted.<\/strong><\/em> <em><strong>Usually used when an adjustment is needed to the voltage.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"239\" height=\"119\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199438 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-2-2.webp\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"239\" height=\"119\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-2-2.webp\" alt=\"\" class=\"wp-image-199438 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><a href=\"https:\/\/todayshomeowner.com\/hvac\/guides\/what-are-air-conditioner-capacitors\/\"><strong><em>AC <\/em><\/strong><\/a><em style=\"font-weight: bold;\"><strong><a href=\"https:\/\/todayshomeowner.com\/hvac\/guides\/what-are-air-conditioner-capacitors\/\">Capacitors<\/a>\u00a0are another type of common part. Change to similar value and rating if damaged.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"238\" height=\"135\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199439 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-3-1.webp\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"238\" height=\"135\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-3-1.webp\" alt=\"\" class=\"wp-image-199439 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Electrolytic Capacitor\u00a0is usually used as smoothing capacitor in power supply regulation. Change to similar rating and value when damaged.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"237\" height=\"122\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199440 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-4-1.webp\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"237\" height=\"122\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-4-1.webp\" alt=\"\" class=\"wp-image-199440 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Variable Capacitor\u00a0is used in tuning the circuit to a required frequency.\u00a0<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"229\" height=\"92\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199441 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-5-1.webp\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"229\" height=\"92\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-5-1.webp\" alt=\"\" class=\"wp-image-199441 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Inductor\u00a0resists the flow of current. Change to similar value and rating if open circuit.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"234\" height=\"122\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199442 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-6.webp\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"234\" height=\"122\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-6.webp\" alt=\"\" class=\"wp-image-199442 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Variable Inductor\u00a0allows the value of the inductance to be changed. Usually used for tuning to a required frequency.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"270\" height=\"255\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199443 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-7.webp\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"270\" height=\"255\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-7.webp\" alt=\"\" class=\"wp-image-199443 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Transformer\u00a0in HVAC circuit is usually used to step down the input AC voltage to a lower AC voltage that is further rectified to get the required DC voltage. Check the original input, output voltages and the VA if you need to change it.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"162\" height=\"242\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199444 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-8.webp\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"162\" height=\"242\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/download-8.webp\" alt=\"\" class=\"wp-image-199444 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>NPN Transistor\u00a0is used to switch a load by inputting a positive voltage of more than 0.7V between Base and Emitter terminals (Bipolar type of transistor). If damaged, get an equivalent part by checking its original part.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"160\" height=\"233\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199446 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/pnp-transistor-symbol-1.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"160\" height=\"233\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/pnp-transistor-symbol-1.png\" alt=\"\" class=\"wp-image-199446 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>PNP Transistor\u00a0is used to switch a load by inputting a positive voltage of more than 0.7V between Emitter and Base terminals\u00a0(Bipolar type of transistor). If damaged, get an equivalent part by checking its original part.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"243\" height=\"143\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199447 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/battery-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"243\" height=\"143\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/battery-symbol.png\" alt=\"\" class=\"wp-image-199447 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Batteries\u00a0are used in a design where there is no power supply available or as a backup DC power in case there is no supply. Change batteries to similar or equivalent type when the backup power is not working.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"223\" height=\"80\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199448 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/fuse-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"223\" height=\"80\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/fuse-symbol.png\" alt=\"\" class=\"wp-image-199448 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Fuse\u00a0is used as a protection in case of short circuit or overcurrent. If burnt, correct the problem and replace fuse with the same type and rating.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"242\" height=\"109\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199449 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/varistor-symbol.jpg\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"242\" height=\"109\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/varistor-symbol.jpg\" alt=\"\" class=\"wp-image-199449 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Varistor\u00a0is used to protect the circuit from surge in voltage or lightning. Replace with similar rating when burnt or damaged.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"231\" height=\"187\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199450 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/triac-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"231\" height=\"187\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/triac-symbol.png\" alt=\"\" class=\"wp-image-199450 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Triac\u00a0is usually used in motor control application where the speed of the motor is controlled by controlling the amount of power to it. Phase angle control is the typical one used in controlling fan motors.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"237\" height=\"124\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199451 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/zener-diode-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"237\" height=\"124\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/zener-diode-symbol.png\" alt=\"\" class=\"wp-image-199451 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Zener Diode\u00a0can be used to clamp the voltage to a fix level depending on its value. Change to similar rating when damaged.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"245\" height=\"100\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199452 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/diode-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"245\" height=\"100\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/diode-symbol.png\" alt=\"\" class=\"wp-image-199452 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Diode\u00a0allows the current to pass in one direction from anode to cathode. Change to same rating if burnt.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"262\" height=\"173\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199453 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/led-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"262\" height=\"173\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/led-symbol.png\" alt=\"\" class=\"wp-image-199453 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><strong><em>A LED\u00a0<\/em><\/strong><em><strong>or light emitting diode is used to display the status of the system. Seldom damaged, but if burnt, change to an equivalent type.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"235\" height=\"181\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199454 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/SCR-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"235\" height=\"181\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/SCR-symbol.png\" alt=\"\" class=\"wp-image-199454 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><strong><em>The SCR\u00a0or\u00a0Thyristor\u00a0can switch and carry high current by applying a small pulse to the gate of the device. Only half of the power cycle is used as this is a uni-directional device. \u00a0Change to an equivalent device if damaged.<\/em><\/strong><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"193\" height=\"185\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199455 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/speaker-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"193\" height=\"185\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/speaker-symbol.png\" alt=\"\" class=\"wp-image-199455 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>A speaker\u00a0or\u00a0horn\u00a0is used to emit sound to inform the user of events that happen.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"132\" height=\"111\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199456 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/power-ground-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"132\" height=\"111\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/power-ground-symbol.png\" alt=\"\" class=\"wp-image-199456 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Power ground of the circuit.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"393\" height=\"308\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199457 size-full lazyload\" data-lazy-data-sizes=\"auto\" data-srcset=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/optocoupler-symbol.png 393w, https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/optocoupler-symbol-300x235.png 300w\" data-lazy-data-sizes=\"(max-width: 393px) 100vw, 393px\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/optocoupler-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"393\" height=\"308\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/optocoupler-symbol.png\" alt=\"\" class=\"wp-image-199457 size-full lazyload\" data-sizes=\"auto\" data-srcset=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/optocoupler-symbol.png 393w, https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/optocoupler-symbol-300x235.png 300w\" data-sizes=\"(max-width: 393px) 100vw, 393px\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Opto-coupler\u00a0is usually used to isolate a high-power circuit from another circuit for safety reasons via the optical circuit. When the diode is on, it will cause the load that is connected to the transistor to turn on. The primary circuit and the secondary circuit are electrically isolated.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"329\" height=\"243\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199458 size-full lazyload\" data-lazy-data-sizes=\"auto\" data-srcset=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/op-amp-symbol.png 329w, https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/op-amp-symbol-300x222.png 300w\" data-lazy-data-sizes=\"(max-width: 329px) 100vw, 329px\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/op-amp-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"329\" height=\"243\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/op-amp-symbol.png\" alt=\"\" class=\"wp-image-199458 size-full lazyload\" data-sizes=\"auto\" data-srcset=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/op-amp-symbol.png 329w, https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/op-amp-symbol-300x222.png 300w\" data-sizes=\"(max-width: 329px) 100vw, 329px\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Op-Amp\u00a0is another useful device that has many applications. There are usually a few of this devices in a semiconductor package.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"232\" height=\"99\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199459 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/crystal-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"232\" height=\"99\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/crystal-symbol.png\" alt=\"\" class=\"wp-image-199459 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Crystal\u00a0is needed to provide clock that runs the microprocessor or microcontroller.\u00a0<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"339\" height=\"340\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199462 size-full lazyload\" data-lazy-data-sizes=\"auto\" data-srcset=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/diode-bridge-symbol.png 339w, https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/diode-bridge-symbol-300x300.png 300w, https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/diode-bridge-symbol-150x150.png 150w\" data-lazy-data-sizes=\"(max-width: 339px) 100vw, 339px\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/diode-bridge-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"339\" height=\"340\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/diode-bridge-symbol.png\" alt=\"\" class=\"wp-image-199462 size-full lazyload\" data-sizes=\"auto\" data-srcset=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/diode-bridge-symbol.png 339w, https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/diode-bridge-symbol-300x300.png 300w, https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/diode-bridge-symbol-150x150.png 150w\" data-sizes=\"(max-width: 339px) 100vw, 339px\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Diode bridge\u00a0is a combination of four diodes that are connected to convert AC voltage to DC voltage.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"152\" height=\"238\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199468 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/igbt-symbol-2.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"152\" height=\"238\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/igbt-symbol-2.png\" alt=\"\" class=\"wp-image-199468 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>IGBT\u00a0or\u00a0insulated gate bipolar transistor\u00a0is used to switch high current load. Usually used in inverter or power supply circuit.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"156\" height=\"143\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199463 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/Vcc-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"156\" height=\"143\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/Vcc-symbol.png\" alt=\"\" class=\"wp-image-199463 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>The Vcc is the DC power supply that has been rectified and is usually used to power up semiconductor devices and other DC circuitry.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<div class=\"wp-block-media-text alignwide is-stacked-on-mobile\" style=\"grid-template-columns:25% auto\">\n<figure class=\"wp-block-media-text__media\"><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"233\" height=\"134\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"\" class=\"wp-image-199464 size-full lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/lamp-symbol.png\"\/><noscript><img loading=\"lazy\" loading=\"lazy\" decoding=\"async\" width=\"233\" height=\"134\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/05\/lamp-symbol.png\" alt=\"\" class=\"wp-image-199464 size-full lazyload\"\/><\/noscript><\/figure>\n<div class=\"wp-block-media-text__content\">\n<p><em><strong>Lamp\u00a0is used as a visual indicator of the status of a system.<\/strong><\/em><\/p>\n<\/div>\n<\/div>\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n<p>Understanding and using the HVAC symbols and terms in this chart will help to diagnose and address many common issues with your HVAC system. Accurately interpreting these HVAC control symbols will pinpoint problems and necessary repairs. If unable to understand the abbreviations, terms and HVAC symbols I recommend you contact a professional technician. They are experts at diagnosing issues with airflow, refrigerant, HVAC ductwork, actuators and other HVAC system components. A technician familiar with HVAC control symbols has the necessary tools to handle complex issues, so that your system operates efficiently and safely.<\/p>\n<p>Related: <a href=\"https:\/\/todayshomeowner.com\/hvac\/guides\/types-of-hvac-measuring-instruments\/\">Types of HVAC Measuring Instruments<\/a><\/p>\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\/laurieengle\/\">Laurie Engle<\/a>. <\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div><\/div>\n<div>\n<section class=\"bothAR bothARcolOne th-block th-author-contributor\">\n<div class=\"th-author-contributor--photo\">\n                <img loading=\"lazy\" decoding=\"async\" width=\"130\" height=\"130\" loading=\"lazy\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"avatar for Alora Bopray\" class=\"lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/07\/alora-headshot.png\"\/><noscript><img loading=\"lazy\" decoding=\"async\" width=\"130\" height=\"130\" loading=\"lazy\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/07\/alora-headshot.png\" class=\"lazyload\" alt=\"avatar for Alora Bopray\"\/><\/noscript>\n            <\/div>\n<div class=\"th-author-contributor--data\">\n<p class=\"th-author-contributor--data-name\">Alora Bopray<\/p>\n<p class=\"th-author-contributor--data-position\">Staff Writer<\/p>\n<\/p><\/div>\n<p>\n                Alora Bopray is a digital content producer for the home warranty, HVAC, and plumbing categories at Today&#8217;s Homeowner. She earned her bachelor&#8217;s degree in psychology from the University of St. Scholastica and her master&#8217;s degree from the University of Denver. Before becoming a writer for Today&#8217;s Homeowner, Alora wrote as a freelance writer for dozens of home improvement clients and informed homeowners about the solar industry as a writer for EcoWatch. When she&#8217;s not writing, Alora can be found planning her next DIY home improvement project or plotting her next novel.            <\/p>\n<p class=\"th-author-contributor--cta\"><a href=\"https:\/\/todayshomeowner.com\/author\/abopray\/\"><span>Learn More<\/span><\/a><\/p>\n<\/section>\n<section class=\"bothAR th-block th-author-contributor\">\n<div class=\"th-author-contributor--photo\">\n                    <img loading=\"lazy\" decoding=\"async\" width=\"130\" height=\"130\" loading=\"lazy\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"data:image\/svg+xml,%3Csvg%20xmlns=\" http:=\"\" alt=\"photo of Laurie Engle\" class=\"lazyload\" data-lazy-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/10\/LaurieEngleHeadshot.png\"\/><noscript><img loading=\"lazy\" decoding=\"async\" width=\"130\" height=\"130\" loading=\"lazy\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" data-src=\"https:\/\/d7fcfvvxwoz9e.cloudfront.net\/dom43635\/wp-content\/uploads\/2023\/10\/LaurieEngleHeadshot.png\" class=\"lazyload\" alt=\"photo of Laurie Engle\"\/><\/noscript>\n                <\/div>\n<div class=\"th-author-contributor--data\">\n<p class=\"th-author-contributor--data-name\">Laurie Engle<\/p>\n<p class=\"th-author-contributor--data-position\">Expert Writer &amp; Reviewer<\/p>\n<\/p><\/div>\n<p>\n                    Laurie Engle is a freelance writer who provides insights to homeowners on topics such as the home warranty industry, relocation issues, and real estate trends. As a licensed Realtor since 2001 Laurie has acquired extensive expertise in dealing with home warranty companies and navigating the intricacies of the real estate market. In addition to her commitment to helping clients with their home buying and selling needs, she maintains a sharp awareness of market dynamics, including property values, interest rates, and local regulations.                <\/p>\n<p class=\"th-author-contributor--cta\"><a href=\"https:\/\/todayshomeowner.com\/author\/laurieengle\/\"><span>Learn More<\/span><\/a><\/p>\n<\/section><\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>When troubleshooting a malfunctioning HVAC system, it\u2019s important to understand HVAC symbols. These symbols, found in electrical and electronic schematics, guide the design and repair of the system\u2019s circuit boards and wiring. You can become familiar with these symbols by reading your HVAC system manual. Interpreting HVAC symbols allows you to accurately interpret circuit diagrams, [&hellip;]<\/p>\n","protected":false},"author":222,"featured_media":11129,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[124],"tags":[],"class_list":["post-11128","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 v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>HVAC Symbols and Their Meanings | Unlock Informed Choices with Us<\/title>\n<meta name=\"description\" content=\"Knowing how to read the HVAC symbols used in schematic diagrams will enable you to understand how the electronics of a HVAC system works.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, 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