Bryan goes deep into how to evacuate or “vacuum” an AC system, covering the Full Vacuum Procedure. This video is a collaboration with Paul from The Engineering Mindset channel.
🏆Check out Pauls video on how a vacuum pump works here: https://www.youtube.com/watch?v=pnqXEnn3DNk&feature=youtu.be
We take a deep dive into how to connect vacuum pumps, micron gauges, remove cores and much more to show you start to finish how to pull a deep vacuum on any air conditioner or refrigeration equipment.
Read all the tech tips, take the quizzes
and find our handy calculators at https://www.hvacrschool.com/
The vacuum pump shown in this video is the NAVAC NRP8DI – https://www.trutechtools.com/NAVAC-NRP8Di-Vacuum-Pump
Micron Gauge Shown is the BluVac Micro – https://www.trutechtools.com/Accutools-BluVac-Plus-Micro-Wireless-Digital-Micron-Gauge
Vacuum Hose Kit and Core Removers is the BluVac TruBlu Advanced – https://www.trutechtools.com/Tru-Blu-Advanced-Kit-BluVac-LTE
Core Depressor – S10767 – https://www.trutechtools.com/Accutools-S10767-Shrader-Depressor-Tool-1-4×1-4
Watch More of our Videos
Funny Videos from the Life of a Tech – https://www.youtube.com/playlist?list=PLjmMtP2_3aVt8i7Z1o9PmYen4XgC_X6QX
Pressure and Temperature Basics – https://youtu.be/Y2ex2OxIXT0
Make Flare Connections that don’t leak – https://youtu.be/BO7ZaLgfWTQ
Air Conditioning Compressor Basics – https://youtu.be/0lfa9rm8_x8
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Great video, Bryan. So many good tips!
First let me say I know nothing about HVAC systems. I am retired and basically I watch these videos for entertainment . I like learning new things and this is a good way to do it. My question “and this may show my stupidity” but when is the evacuation of a system necessary. Is it only done when components are changed out or at the initial installation I love watching your videos so keep them coming. Thanks
After the lines are vacuumed and you need to change the filter drier what has to be done to avoid the vacuumed line to absorb lots of air ?
Now a days no longer needed
Nice work
Is it imperative to recover refrigerant before the vacuum and recharge process
Great lesson! would you recommend running the evap motor to introduce heat to aid during the vacuum process?
Thank you.
Yeh, it is creating low pressure by "sucking" the molecules only
Thank you, perfect video to learn.
Have you ever heard of or used refrigerant gas instead of nitrogen to break the vacuum for the triple evacuation? My boss have reprimanded me for using nitrogen. Explanation is that refrigerant gas is dryer. Feedback please? I’m begging you and I would love some science behind it if there is any.
Thank you for your videos
I wish I could get the guys at the company I work for to understand this. I only do ductless systems. Nobody uses a torque wrench, nobody pressure checks to the right pressure and evacuations are just a joke. I’m the only one that installs and evacuates properly. The funny part about this whole thing is that I’m not an HVAC guy. I’m a licensed electrician who installs ductless units better than all the HVAC guys. I’m so tired of theses guys doing the customer wrong that I’m seriously considering going back out on my own. Thanks for all the good videos.
Wow very cool information
Can't possibly read all the comments and don't know how to search through them, so i'll ask the question, does the procedure remove water from the desiccant as well. And one more question please. What to do if you have mold inside the refrigerant and/or desiccant.
Is it a class 5 roaming vapor?
good day sir , do you have a video on how to use clamp multimeter
This video lasted longer than an accual pull down for most residential installers
good video!
There seems to be conflicting opinions on wether to expose your micron gauge to refrigerant or not…
Do you open the lines after the vacuum for the negative pressure so it don't introduce moister and break vacuum.
😫 OMG I've been doing it wrong! Ty HVAC School!
VERY IMPORTANT INFORMATION
this is why feildpeice sman is inferior to testo because the micron guage is internal to the manifold and not at the farthest point
so u dont need any dryer filter before the vacuum hose or smth ?
Some systems have the service ports at bastard angles. You're lucky to pull from one side without a valve for tool.
I have been doing HVAC for 15 years and this video blew my mind! Very insightful, thank you for the knowledge sir! Can you please tell me where I can get the hose and clamps for that set up? I have never seen this at a supply house and it is very effective!
I was never able to pull below 3500 microns on a 3-1/2 ton system with a 60 foot lineset. There were zero leaks in the system. Pump ran for hours. System has been running for 22 years.
Can you, use helium, instead of nitrogen?
👍
Never had any issues when pulling a vac or cleanout.. but have had many a issue when filling.. had one where all i had were small 1lb tanks to fill an r22 system because was only things i could get at the monent. But was a simple 5 ton and when i got to the 4th bottle with purging and by the books aside from the small tanks.. but it for whatever reason took damn near 4 hours. To put in that last bottle and hit the correct sh… dunno what the hell.. but that systems been up and running ever since i replaced the compressor and reversing valve, that was 4 years ago. But ive had that happen a couple times where suddenly filling slows down to damn near a hault…
Thank you. Better than any college professors
Given enough time, will all the moisture be able to be boiled out the system with POE oil Such a case of as a condenser coil rupture and open for several days with storms.
My friend…. what to do if we don't have vacuum pump when we change filter drier …
so how do you purge with nitrogen
ICP are complete garbage. Love changing those heat exchangers don't you.
👌👌👌👌 Superb presentation. .
Thank You Very Much.
superb video sir thanks
This is great. 5 years in the industry and I love learning ways to make my job easier and systems last longer
Hi .. when i close the vacuum pump.. after some minute's the testo gos 1500 micron its normal?
Does anyone know if there is a way to test an installed system to verify that it was vacuumed to the proper micron level by the HVAC company?