Recycled R-134a refrigerant cannot exceed what levels of contaminants?<\/p>\n\n\n\n
A) Moisture: 50 PPM by weight
B) Refrigerant oil: 500 PPM by weight
C) Non-condensable gases (air): 150 PPM by weight
D) all the above<\/p>\n\n\n\n
When external portable containers are used for transfer of recycled refrigerant, they must be evacuated to at least __<\/em><\/strong>, before being put into service.<\/p>\n\n\n\n A) 2 in Hg The Correct Answer and Explanation is:<\/mark><\/strong><\/p>\n\n\n\n Let’s break down each part of your question carefully.<\/p>\n\n\n\n Options:<\/strong> R-134a is a commonly used refrigerant, especially in automotive air conditioning and refrigeration systems. When refrigerants are recycled, it\u2019s critical to control contamination levels to ensure the system\u2019s efficiency, safety, and longevity. Contaminants such as moisture, oil, and non-condensable gases can severely impact the refrigeration cycle and equipment operation.<\/p>\n\n\n\n Because all these contaminant limits are critical and specified, option D) all the above<\/strong> is correct.<\/p>\n\n\n\n Options:<\/strong> When using external portable containers to transfer recycled refrigerant, it is essential to evacuate these containers to remove air and moisture before filling them with refrigerant. The evacuation process ensures that the container has minimal contamination, preventing the introduction of air, moisture, or other impurities into the refrigeration system.<\/p>\n\n\n\n Evacuating to 27 in Hg ensures that the container is as free of contaminants as possible before refrigerant transfer, maintaining system integrity and performance.<\/p>\n\n\n\n Both practices are crucial to maintaining the performance, reliability, and safety of refrigeration systems using recycled refrigerant<\/p>\n","protected":false},"excerpt":{"rendered":" Recycled R-134a refrigerant cannot exceed what levels of contaminants? A) Moisture: 50 PPM by weightB) Refrigerant oil: 500 PPM by weightC) Non-condensable gases (air): 150 PPM by weightD) all the above When external portable containers are used for transfer of recycled refrigerant, they must be evacuated to at least __, before being put into service. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-216761","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/216761","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=216761"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/216761\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=216761"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=216761"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=216761"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}<\/ol>\n\n\n\n
B) 10 in Hg
C) 17 in Hg
D) 27 in Hg<\/p>\n\n\n\n
\n\n\n\nQuestion 1: Contaminant Limits in Recycled R-134a Refrigerant<\/h3>\n\n\n\n
A) Moisture: 50 PPM by weight
B) Refrigerant oil: 500 PPM by weight
C) Non-condensable gases (air): 150 PPM by weight
D) All the above<\/p>\n\n\n\n
\n\n\n\nCorrect answer: D) all the above<\/strong><\/h3>\n\n\n\n
\n\n\n\nExplanation:<\/h3>\n\n\n\n
\n
Moisture in refrigerants can lead to the formation of acids and corrosion inside the system. It also causes ice formation in expansion valves or capillary tubes, leading to blockages. For recycled R-134a refrigerant, moisture levels must not exceed 50 parts per million (PPM) by weight<\/strong> to avoid these problems.<\/li>\n\n\n\n
Oil contamination beyond acceptable levels can cause lubrication issues and reduced heat transfer efficiency. While oil is necessary for compressor lubrication, excess oil in the refrigerant can impair system performance, cause clogging, and reduce heat exchange efficiency. The maximum allowable limit for refrigerant oil in recycled R-134a is 500 PPM by weight<\/strong>.<\/li>\n\n\n\n
Air and other non-condensable gases trapped in the refrigerant can cause higher operating pressures and reduced cooling capacity. These gases do not condense and remain in the system, causing increased pressure, corrosion, and inefficient operation. The maximum allowable non-condensable gases in recycled refrigerant is 150 PPM by weight<\/strong>.<\/li>\n<\/ol>\n\n\n\n
\n\n\n\nQuestion 2: Evacuation Level for External Portable Containers Used in Refrigerant Transfer<\/h3>\n\n\n\n
A) 2 in Hg
B) 10 in Hg
C) 17 in Hg
D) 27 in Hg<\/p>\n\n\n\n
\n\n\n\nCorrect answer: D) 27 in Hg<\/strong><\/h3>\n\n\n\n
\n\n\n\nExplanation:<\/h3>\n\n\n\n
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\n\n\n\nSummary<\/h3>\n\n\n\n
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