What Is a Good Vacum Reading for a Good Vacum Pump
Anyone that has ever picked up a vacuum pump has asked or been asked this question, and to be truthful it is similar asking "How many licks volition it take to get to the centre of a Tootsie Roll Tootsie Pop?" In the words of the wise old owl, "The world may never know."
Modern twenty-four hour period 
evacuation techniques are meant to degas and dehydrate a system, cleaning it of contaminants to a level that assures that not-condensibles – and more importantly, moisture – volition cause no harm to the refrigerant or the refrigerant oil in the organization. Wet with oil forms sludge, and wet with refrigerant forms hydrofluoric and hydrochloric acids. All of these can cause permanent damage to the refrigeration system.
How long an evacuation takes depends on many factors in this order, including but not limited to, the size of the system, the level of organisation contagion, the diameter and length of the vacuum hoses, the presence of the Schrader cores in the service valves, dryness of the vacuum pump oil, and lastly, the size of the vacuum pump.
More important than how long will an evacuation take is understanding when the evacuation is complete. Removal of the air is an like shooting fish in a barrel process, but the removal of moisture is much more than difficult and simply takes time. Moisture has potent molecular bonds and does non easily gratuitous itself from the surfaces it attaches to. It takes heat energy and time for the bonds to break and a deep vacuum for the pump to ultimately carry that moisture out of the system.
The best advice that can be given, when it comes to evacuation, is to brand certain the preparation of the copper tubing is kept the primary priority. Keeping the organization clean (contaminate gratuitous), dry and leak complimentary during associates volition save far more time on the back end then the doubt it will introduce into the time required to clean the system through the evacuation process.
To properly clean (degas and dehydrate) the organisation, an accurate vacuum gauge is an indispensable component of the evacuation system. The employ of an electronic vacuum approximate is the simply way to determine when the dehydration process is consummate. Using an electronic micron judge like the BluVac+ Professional and its accompanying application volition bear witness yous the characteristics of moisture allowing you to hands identify a moisture vs a dry system. At 5,000 microns, 99.34% of the degassing has occurred, but the wet removal is just get-go. If yous cannot achieve a vacuum below 5000, information technology is a good indicator of a arrangement leak, a leak in your vacuum hoses, contaminated vacuum pump oil, etc.
In one case you are below 5,000 microns you tin can be assured that aridity is occurring and that moisture is beingness boiled off and removed the through evacuation process. Significant levels of dehydration are not occurring until the vacuum level is below 1,000 microns.
When is comes to the vacuum gauge reading and the bodily vacuum level, and an important distinction must be made. Pulling below 500 microns and being below 500 microns are two totally different things. A adept vacuum rig coupled to a large pump tin can overpower the aridity process, pulling beneath 500, but not removing the moisture which simply takes time. It is non until the vacuum has been isolated that nosotros can determine the ultimate level of vacuum. Cadre tools are essential to isolate the vacuum pump and rig from the system when the ultimate vacuum level is being measured. The system needs to agree below the target vacuum to assure that adequate aridity has occurred.
The following are guidelines for an acceptable standing level of vacuum. For systems containing mineral oil similar R22 systems, a finishing vacuum of 500 microns with a decay belongings below yard microns generally considered acceptable, whether we are talking a new installation or a organisation opened for service. For the system containing POE oil, like that of a R410a or R404a system, a finishing vacuum of 250 with a decay holding 500 microns or less should be achieved, and never a decay rising over ane,000 microns on an R410a system opened for service. For ultra-low-temperature, refrigeration, a finishing vacuum as low as 20 microns may exist required with a decay holding below 200 microns (for these systems, consult the manufacturer if at all possible). Each of these requirements is focused on the acceptable level of moisture remaining in the organisation, again because at these levels the majority of degassing has already occurred. The fourth dimension immune for disuse depends upon the size of the organization, but generally, 10 minutes minimum with 1 minute added per ton is a good guideline.
The moral of the story is this: A proper evacuation may take 15 minutes, 15 hours, or 15 days, it merely takes what it takes. While removing cores, using large diameter hoses, clean oil, and a properly sized pump will definitely shorten the time required to complete the process, the true fourth dimension required is a function of the cleanliness and dryness of the system beingness evacuated.
Evacuation cannot be rushed or shortcut because the consequences are far worse than the lost fourth dimension in the process. The best and virtually important matter to remember is cleanliness is side by side to godliness when it comes to preparation and finally, evacuation. This means proceed the system pipage clean, your vacuum rig clean, the oil make clean, and follow good processes. This is a signal that cannot be understated when trying to shorten the fourth dimension required to complete the process properly.
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Source: https://accutools.com/how-long-should-you-evacuate-a-system
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