How to Evacuate an Air Conditioning System (Fast and Deep Vacuum)
July 7, 2018
Evacuation refers to when we pull the inside of the A/C circuit into a vacuum. Under vacuum conditions, the water would boil at a lower temperature due to the removal of atmospheric pressure (14.7 PSIA). Evacuation essentially sucks the air and gaseous contaminants out of an A/C system’s refrigerant circuit. Liquid water, however, can’t be sucked out of a system; it must be boiled out.
Before evacuation, we want to make sure that the suction pressure stays relatively constant over the span of several minutes.
We use core removal tools (CRTs) when we do our evacuations. These tools allow us to insert or remove Schrader cores when the valve is in the open position. We simply attach the CRT to the refrigerant line in the closed position, tighten it down, open the valve, push the core to unscrew and remove it, close the valve, and remove the section that contains the core.
Removing the cores during evacuation allows us to get faster evacuations when we connect our hoses to the CRT. Schrader cores provide a restriction, and we can speed up our evacuations by removing that restriction with a good CRT. We also recommend attaching the micron gauge to the CRT’s side port.
After seeing that our suction pressure has held steady, we can pull the vacuum. Bryan attaches the CRTs on both sides with the vacuum-rated hoses and micron gauge. We don’t pull the vacuum through the gauges; we use hoses and pull through the CRTs. We keep the hoses sealed up until we need them so that we reduce the risk of contamination.
When we start up the vacuum pump, we notice that the dehydration period is short and that the vacuum pulls down very quickly. We are using the BluVac app, which allows us to see the saturation temperature of water under the pressure conditions, which is extremely low (-13 degrees Fahrenheit vs, the usual 212 degrees Fahrenheit). We pull down to 300 microns, which is what we recommend. When we reach that target, we valve off the CRTs and do our decay test.
Our vacuum rig consists of two large (1/2″) hoses in a T formation with a 3/8″ connector down to a 1/2″ connector. The connector is 1/4″ at the CRT.
The decay rate is the rate at which the pressure rises after pulling down a vacuum. The BluVac app can determine that our decay rate is well within an acceptable range within a few minutes, but many traditional decay tests last longer.
The BluVac app displays the maximum decay target and your decay target on the same graph; you can configure the app to suit your testing procedures and set your targets to make sure the app shows the data you need.
Comments
Great Video! We use the two hose direct vacuum method as well. However most times we have found that after getting to about 250 microns we isolate the pump and the microns rise above 500 after 15 minutes of standing sometimes over 1000! Does this indicate a leak somewhere? The nitrogen test holds and does not drop so the microns rising throws us off. What could it be?
Great Video! We use the two hose direct vacuum method as well. However most times we have found that after getting to about 250 microns we isolate the pump and the microns rise above 500 after 15 minutes of standing sometimes over 1000! Does this indicate a leak somewhere? The nitrogen test holds and does not drop so the microns rising throws us off. What could it be?
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Уверенность в своем луке укрепляет личную уверенность.
Этот подход подчеркивает ваш уровень ответственности и внимание к мелочам.
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Через гардероб вы имеете шанс проявить свою индивидуальность и вкус.
Люди часто воспринимают опрятных людей как более успешных.
Следовательно, вложения в собственный стиль — это инвестиции в ваше успешное будущее.
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The abundance of answers somehow leaves many people more lost than before.
What is deeply personal gets handed out as though it applies to everyone equally.
Fatigue arrives, or tension, or a shift in appetite—signals the body offers if we slow down enough to notice.
No two bodies move through life at the same pace.
Paying attention surfaces details we didn’t know we were missing.
Over time, health shifts from being something we pursue to something we inhabit.
Maintained over time, attention becomes a steadying force—quiet but reliable.
If you’re ready to trust what you feel again rather than second-guessing it.
To see the subtle patterns that have been quietly directing your experience.
Building knowledge through attention, not habit alone.
When we truly listen, health stops being a destination and becomes a story still being written.
That intersection—between what the body communicates and what research can explain—is where insight stops being abstract and starts being actionable.
That’s precisely why it makes sense to look more closely at losartan for diabetic kidney disease.
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Окружающие неосознанно воспринимают опрятных индивидов как более успешных.
Следовательно, инвестиции в свой образ — это вклад в свое успешное будущее.
Стильный внешний вид формирует сильное впечатление о человеке.
Он работает на восприятие вас коллегами сразу.
Уверенность в своем образе укрепляет вашу уверенность.
Он подчеркивает ваш уровень ответственности и внимание к деталям.
https://r6.balmain1.ru/P6uHuawnZZW/
Посредством гардероб вы имеете шанс проявить свою личность и вкус.
Окружающие неосознанно воспринимают опрятных индивидов как более успешных.
Следовательно, инвестиции в свой образ — это вклад в свое успешное будущее.
Стильный вид формирует сильное мнение о человеке.
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Стильный вид формирует сильное мнение о человеке.
Ваш образ работает на оценку вас окружающими мгновенно.
Хорошее самочувствие в своем луке повышает личную самооценку.
Этот подход демонстрирует ваш стандарт ответственности и уважение к деталям.
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Посредством одежду вы можете проявить свою личность и вкус.
Люди часто оценивают стильных индивидов как более успешных.
Поэтому, вложения в свой стиль — это инвестиции в свое успешное будущее.
Опрятный внешний вид создает сильное мнение о человеке.
Ваш образ работает на оценку вас коллегами сразу.
Хорошее самочувствие в подобранном луке укрепляет вашу самооценку.
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Через гардероб вы можете выразить свою личность и вкус.
Окружающие неосознанно оценивают стильных людей как более успешных.
Поэтому, вложения в собственный стиль — это вклад в ваше будущее.
Опрятный внешний вид создает сильное мнение о человеке.
Ваш образ работает на оценку вас коллегами сразу.
Хорошее самочувствие в подобранном луке укрепляет вашу самооценку.
Этот подход подчеркивает высокий стандарт ответственности и уважение к деталям.
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Через гардероб вы можете выразить свою личность и вкус.
Окружающие неосознанно оценивают стильных людей как более успешных.
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A put-together appearance conveys competence in the office.
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Stylish clothing allow you to express your individual personality.
People often judge well-dressed people as more capable and reliable.
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