{"id":4899,"date":"2016-02-10T18:09:58","date_gmt":"2016-02-10T18:09:58","guid":{"rendered":"http:\/\/www.clubedarefrigeracao.com.br\/en\/?p=4899"},"modified":"2023-08-22T20:00:30","modified_gmt":"2023-08-22T20:00:30","slug":"failures-in-the-refrigeration-system","status":"publish","type":"post","link":"https:\/\/www.embraco.com\/blog\/en-us\/failures-in-the-refrigeration-system\/","title":{"rendered":"Failures in the refrigerantion system"},"content":{"rendered":"<p>[gravata] Know the causes and basic precautions to avoid them.\u00a0\u00a0[\/gravata]<\/p>\n<p dir=\"ltr\">The issue of possible causes for failures in refrigeration systems was presented in several Embraco mini-lectures during the last Febrava. There was great interest from participants therefore we\u2019ve decided to address this subject here, more broadly.<\/p>\n<p dir=\"ltr\">Embraco is very concerned about the issues that impact the quality of its products and various measures are taken to control production in order to reduce failures in the field. However, most of the compressors returned to Embraco as a field reject have no defects.<\/p>\n<p dir=\"ltr\">To begin with, we must emphasize that these failures can originate from problems related to an electrical or mechanical part.<\/p>\n<p dir=\"ltr\">Problems of electrical origin are concentrated in three aspects:<\/p>\n<ul>\n<li>\nCompressor motor;\n<\/li>\n<li>\nCompressor electric components;\n<\/li>\n<li>\nRefrigerator electric accessories.\n<\/li>\n<\/ul>\n<p>But those which have mechanical origin are mainly due to problems related to:<\/p>\n<ul>\n<li>\nMechanical kit;\n<\/li>\n<li>\nValves set;\n<\/li>\n<li>\nShocks during compressor transport.\n<\/li>\n<\/ul>\n<p>From analyzing actual customer cases, Embraco specialists have detected the six main problems that occur, explained below.<\/p>\n<div style=\"width: 305px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/www.clubedarefrigeracao.com.br\/wp-content\/uploads\/2015\/12\/Screen-Shot-12-17-15-at-10.08-AM.png\"><img decoding=\"async\" loading=\"lazy\" src=\"http:\/\/www.clubedarefrigeracao.com.br\/wp-content\/uploads\/2015\/12\/Screen-Shot-12-17-15-at-10.08-AM-295x300.png\" width=\"295\" height=\"300\" \/><\/a><p class=\"wp-caption-text\"><i>On the compressor above, there are corrosion spots (arrow 1) on the steel stator, due to moisture the sludge deposit (arrow 2) on the cylinder cover is formed by lubricant degradation, a process called &#8220;oil carbonization&#8217;. therefore, the oil loses its ability to lubricate the compressor and, associated with this sludge deposit, can lead to a locked compressor.<\/i><\/p><\/div>\n<p><b>1. Moisture<\/b><br \/>\nThe first step to avoid this problem is to perform the vacuum correctly, using a suitable pump and maintaining the process for a minimum of 30 minutes after reaching the state of 500 microns of mercury. This is the most important step to avoid moisture. It\u2019s worth remembering: to never use another compressor to perform the vacuum.<\/p>\n<p>Other problem sources are associated with the filter drier: it\u2019s important to replace it with a similar model when working on the refrigeration system.<br \/>\nLow quality refrigerants may also contain moisture, so it\u2019s necessary to be careful when buying them.<br \/>\nIt\u2019s also recommended to look for leaks in the tubing, because there\u2019s the possibility of moisture penetration directly through air infiltration<\/p>\n<p>A very clear sign that there is moisture in the system is the presence of a dark colored and strong odor oil. The lubricating oil, in its normal state, is colorless (tube on the left in the image below). If it\u2019s a clear yellow color (tube in the center) it\u2019s acceptable, but with signs of moisture. When it\u2019s dark (tube on the right), you can be sure that there\u2019s a problem.<\/p>\n<div style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"http:\/\/www.clubedarefrigeracao.com.br\/wp-content\/uploads\/2015\/12\/Placa-v\u00e1lvula.jpg\"><img decoding=\"async\" loading=\"lazy\" alt=\"Placa v\u00e1lvula carbonizada: umidade \u00e9  uma das poss\u00edveis causas\" src=\"http:\/\/www.clubedarefrigeracao.com.br\/wp-content\/uploads\/2015\/12\/Placa-v\u00e1lvula-300x208.jpg\" width=\"300\" height=\"208\" \/><\/a><p class=\"wp-caption-text\">Carbonized plate valve: moisture is one of the possible causes<\/p><\/div>\n<p><b>2. Valve Plate Carbonization<\/b><br \/>\nCorrect compressor installation or good preventive maintenance avoids valve plate carbonization. This problem has three causes:<\/p>\n<ul>\n<li>\nSystem operating with moisture;\n<\/li>\n<li>\nCondensing unit\u2019s fan failure;\n<\/li>\n<li>\nHigh operating temperature.\n<\/li>\n<\/ul>\n<p>Therefore, to prevent this, it\u2019s necessary to avoid moisture (see point 1 of this article), check the fan condition and be attentive to compressor overheating.<\/p>\n<p><b>3. Insulation Melting\/Corrosion<\/b><br \/>\nThis problem is caused by similar factors that lead to valve plate carbonization. In other words, preventive measures should be the same.<\/p>\n<div style=\"width: 310px\" class=\"wp-caption alignright\"><a href=\"http:\/\/www.clubedarefrigeracao.com.br\/wp-content\/uploads\/2015\/12\/Isolamento.jpg\"><img decoding=\"async\" loading=\"lazy\" alt=\"Umidade tamb\u00e9m pode provocar  problemas no isolamento\" src=\"http:\/\/www.clubedarefrigeracao.com.br\/wp-content\/uploads\/2015\/12\/Isolamento-300x242.jpg\" width=\"300\" height=\"242\" \/><\/a><p class=\"wp-caption-text\">Moisture can also cause problems in the insulation<\/p><\/div>\n<p><b>4. Rupture of the cylinder cover gasket<\/b><br \/>\nThis typically occurs when the system has excess refrigerant or excess pressure (see table above). To prevent this problem, be attentive to the gas charge that is specified on the label, performing the charge with a precision scale.<\/p>\n<p>Other possible causes for this rupture include the lack of care when installing as well as an obstruction in the tubing and capillary.<\/p>\n<p><b>5. Burned starting coil<\/b><br \/>\nIn this case, the cause is always of electric origin:<\/p>\n<ul>\n<li>\nInappropriate or defective relay;\n<\/li>\n<li>\nInappropriate or defective thermal protector;\n<\/li>\n<li>\nExtremely high or low voltage (outside the acceptable variation range of 10%);\n<\/li>\n<li>\nStart with no electrical device.\n<\/li>\n<\/ul>\n<div style=\"width: 310px\" class=\"wp-caption alignleft\"><a href=\"http:\/\/www.clubedarefrigeracao.com.br\/wp-content\/uploads\/2015\/12\/Screen-Shot-12-17-15-at-10.13-AM-001.png\"><img decoding=\"async\" loading=\"lazy\" class=\"  \" alt=\"Screen Shot 12-17-15 at 10.13 AM 001\" src=\"http:\/\/www.clubedarefrigeracao.com.br\/wp-content\/uploads\/2015\/12\/Screen-Shot-12-17-15-at-10.13-AM-001-300x276.png\" width=\"300\" height=\"300\" \/><\/a><p class=\"wp-caption-text\">Burned coil: electrical source<\/p><\/div>\n<p><b>6. Problems in the compressor\u2019s thermal protection cycle<\/b><br \/>\nFor this situation, there are several explanations, which should be analyzed by the contractor:<\/p>\n<ul style=\"text-align: left\">\n<li>\nExcessive refrigerant charge, generating very high pressures and amperage;\n<\/li>\n<li>\nExtremely high or low voltage;\n<\/li>\n<li>\nInappropriate or defective relay or thermal protector;\n<\/li>\n<li>\nInadequate or faulty starting capacitor;\n<\/li>\n<li>\nPartially clogged tubing;\n<\/li>\n<li>\nPressures not equalized on startup;\n<\/li>\n<li>\nCompressor inadequate for application with expansion valve;\n<\/li>\n<li>\nCompressor with mechanical or electrical fault.\n<\/li>\n<\/ul>\n<p>It\u2019s necessary to be aware of these failure points, which are the most common in refrigeration systems.<\/p>\n<p><a href=\"http:\/\/www.clubedarefrigeracao.com.br\/en\/wp-content\/uploads\/sites\/3\/2016\/02\/tabela-PRESSURES-FOR-EACH-TYPE-OF-REFRIGERANT-FLUID-AND-APPLICATION.png\"><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-4925\" alt=\"tabela-PRESSURES-FOR-EACH-TYPE-OF-REFRIGERANT-FLUID-AND-APPLICATION\" src=\"http:\/\/www.clubedarefrigeracao.com.br\/en\/wp-content\/uploads\/sites\/3\/2016\/02\/tabela-PRESSURES-FOR-EACH-TYPE-OF-REFRIGERANT-FLUID-AND-APPLICATION.png\" width=\"602\" height=\"365\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>[gravata] Know the causes and basic precautions to avoid them.\u00a0\u00a0[\/gravata] The issue of possible causes for failures in refrigeration systems was presented in several Embraco mini-lectures during the last Febrava. There was great interest from participants therefore we\u2019ve decided to address this subject here, more broadly. Embraco is very concerned about the issues that impact [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":5192,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[49],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v20.13 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Failures in the refrigerantion system - Refrigeration Club - En-us<\/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.embraco.com\/blog\/en-us\/failures-in-the-refrigeration-system\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Failures in the refrigerantion system - Refrigeration Club - En-us\" \/>\n<meta property=\"og:description\" content=\"[gravata] Know the causes and basic precautions to avoid them.\u00a0\u00a0[\/gravata] The issue of possible causes for failures in refrigeration systems was presented in several Embraco mini-lectures during the last Febrava. 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