HVAC Full Vacuum Procedure From Start to Finish!
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- čas přidán 29. 05. 2018
- In this HVACR Training Video, I go over how to Perform a Fast and Deep Vacuum for Dehydration of an Air Conditioning System. I go over the Pump, Hose, Valve Core Removal Tool, Micron Gauge Setup, and Step By Step Process to Complete this Procedure Effectively. I go over some hiccups along the way and how to deal with them. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
Tools Used In The Video
CPS 4 CFM Vacuum Pump - amzn.to/2DxgPwY
CPS Vacuum Micron Gauge - amzn.to/2v1nM3O
Appion Valve Core Removal Tool - amzn.to/2uYr8WL
Refrigerant hoses with valves amzn.to/2aBumVI
SDMN5 Dual Digital Water Column Manometer: amzn.to/2x176im
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Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided. ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬
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For those that are looking for the tools used in the videos: (Linked Below)
Here is a link to the JB 6 CFM Vacuum Pump amzn.to/2nqbvo8
Here is the link to the Appion Valve Core Removal Tool- amzn.to/2uYr8WL
Here is the link to the CPS Vacuum Micron Gauge- amzn.to/2v1nM3O
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Here is the Link to the Appion Red 3/8" to 1/4" Vacuum Hose- amzn.to/2uYg6Ro
Here is the link to the Yellow Jacket 1/4" by 1/4" heavy duty hose straight- amzn.to/2umtcod
Here is a link for RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn
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I'm about to order the tools to pull a vacuum using your list, but I'm confused as to which hoses I need. You have a red and yellow hose in the video, but a red, blue, and yellow hose listed. The yellow hose is not yellow once I click on the link.
This is what I'm ordering:
3)Appion Valve Core Removal Tool- amzn.to/2uYr8WL
1)CPS Vacuum Micron Gauge- amzn.to/2v1nM3O
1)Appion Red 3/8" to 1/4" Vacuum Hose- amzn.to/2uYg6Ro
1)Yellow Jacket 1/4" by 1/4" heavy duty hose straight- amzn.to/2umtcod
1)RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn
1)www.amazon.com/dp/B00SV8BCB4/?cv_ct_id=amzn1.idea.3TU6QWW7V7OQI&cv_ct_pg=storefront&cv_ct_wn=aip-storefront&ref=exp_cov_acservicetech_lv_dp_vv_d
Should I just buy a manifold gauge set and use it's hoses for a vacuum? I only intend on doing this once.
You may want to put a comment near the start of the video to remind technicians to use a A2L compatible compressor when using A2L and A3 refrigerants.
So if my line set broke and dumped everything out, to recharge do I vacuum the new line set and the unit by leaving the valves open? Or do I close then and vacuum just the new lines before adding the 410
Aaaaaaaaàaaaaaàaaaaalpapalp
I've been watching your videos for some time, and I just now got the set up for this vacuum. It's absolutely incredible. Thank you for taking time to teach us newer techs the right way of doing things.
Finally got it up and running. The only delays we had was because we realized we needed some extra parts (I’ll list that below) czcams.com/users/postUgkxihMYiJNXcHdbH-7ihymsLz61l7jVyb5O . So we have a loft where our current hvac just couldn’t seem to keep cool during the summer. We have been using a window unit since we bought this house over 6 years ago (all the houses in this neighborhood were built in the 80’s and majority of the houses built like ours use a window unit). I hate window units because they are just so noisy and the one we had really only cools one side of the loft. I had contemplated upgrading our current HVAC, but with all the rising prices these days, it would take years before saving up enough to do that. With the advice of my father-in-law (used to run an HVAC business), he recommended we get an inverter instead. We thought we bought everything we needed, but there were just a few other parts we didn’t anticipate needing (which is what caused most of our delay). My friend and father-in-law did all the work to get it installed and running and now we have nice cool air circulating nicely throughout the entire loft. It is very quiet and even the outside unit is much quieter than our main HVAC unit. Saved ourselves thousands getting this.
I've been in the commercial kitchen repair industry for 15 years and this is top notch. Awesome job man. Great tip for using that third valve core removal tool! I'm stealing this idea and subscribing.
You skipped the entire part where you hooked it up!
I thought I was the only one noticing that.
The gas ballast (if equipped) should be left open until 1200 microns, then closed, thereby bypassing the oil in the pump. Another nice trick to clean your oil and reuse it is to simply run the pump with ballast open, you'll actually see, in about 20 minutes, the oil clear right up if it's milky. The oil industry doesn't like this trick to be known.
We usually only keep the gas ballast open until around 10,000 to 15,000 microns, thanks!
Excellent, clear explanation. I appreciate the time and effort you are putting into every video. New techs need to subscribe and take notes.
Thanks Jimrika2!
My Brother has his own small A/C company and I help him when he needs help but he doesn't have time to teach me so these videos are Awesome !!!
Thanks robjoder!
Well have you asked ?? It's a bad doo if somebody doesn't have time for their family .
Our company is in ohio Gutridge if you are interested in an apprenticeship
@@jsmitty4675 I'm near teays valley WV. If this is still avaible message me . I'd be interested
Excellent explanation and refresher for those of us that has been away from HVAC awhile. What you don’t use, you lose! Thanks
Thanks Raymond!
That’s a fact! Left for 10 years, went back to school for industrial maintenance mechanic and did that for 8 years. That was enough. I rather deal with a much safer work environment and much less stress
Great Resource for HVAC Community! Thanks for the hard work in putting these videos out there!
Thanks Stewart Plumbing!
I've learned so from this channel, I literally have a notebook full of notes just from these videos. Keep up the great work 👍🏽👍🏽👍🏽
Thanks MC!
I've been watching many of your videos and they are by far the most informative. Thank you.
Thanks Lenny C!
Excellent video, I didn't know you could pull a vacuum this fast. Most of my vacuums took 1-2 hours because I never took out the schrader valves or uses hoses free of valve core depressors. Thanks man, this should save some time.
It really does, check out the recovery and pressure testing videos too other processes, thanks
Old comment I know but wanted to point out that aside from the valve core removal, the key is in those larger hoses and as short as possible. Huge time saver.
Instead of spending all the extra cash on another CRT I just use a yellow jacket 45° all brass ball valve to the micron gauge. Also, I have the same 6 cfm pump and I made my own manifold. 3/8 Tee (NPT) to (2) 3/8 NPT to 3/8 flare. I started using 90° fittings so both flare fittings face forward. Good video.
Got ya, sounds good! Sometimes in the past I found that the yellow jacket ball valve wouldn't hold at deep vacuum so that is why I switched to the valve core removal tool rated at 20 microns. Glad to hear it is working for you!
Excellent videos you have, i always watch them and they have helped me. Thank you
Thanks Moises!
Thank you for taking the time to make and share this terrific video...it was informative, brief, to the point and easy to understand...
Thanks a lot James!
Same vacuum pump we use at tech school. Great video man!
Thanks KuatoLives!
Why u not vacuum at highest low vacuum level like 15 micron?
Excellent video. Thank you for making this informative video.
Thanks Maurice!
Thanks bro for all the time you take to explain great work.
Thanks for your comment JAMDYAC!
Enjoyed the video. Keep up the great work!
Thanks HVAC in SC! You have great work as well!
Very nice video, good info. Saves time and vacuum life. 👍🏼
Yes absolutely, Thanks Manuel Torres!
great video, great job on explaining the whole process.
Thanks Felipe!
Great example in real time. Saving that for review later for sure. Thx as always Craig!
Glad it was helpful!
I bought the Red hose, yellow hose and 1 Appion core remover since I already had 2 and tried this set up today. This works great. I pulled a vacuum down to 363 microns in 10 minutes and I didn't even change the oil on my vacuum pump.
Was it also a new line set?
Thanks a lot for these videos, they are really helping me learn
Thanks Prince!
thank you for this good explanation video!! I was wondering, after you remove the core and after you vacuum the system, how do you add refrigerant while the core removal tool connected to the compressor and while the schrader is removed? also, how would you purge the hoses while using the core removal tool?
Thank you for the cool video! Very good explanation.)
Thanks Tapch MC!
thank you for sharing your knowledge
Thank you very much David!
Happy Sunday,tks ,,God bless, from the good Land Milwaukee WI
May the Lord Bless you too Emil, Thanks!
Good idea on core removers as a valve! Thanks for helping.
No problem!
Thanks for sharing this wonderful video!
Thanks a lot William!
as far as opening the service valves, if you buy the napa carlyle 3/8 drive 3/16 and 5/16 allen key bits, they will never fail you. the allen key is about 3 inches long and if you use a long handled ratchet, you will always have the proper depth into the service valve and leverage with the ratchet. it helps tremendously opening service valves
great vid thanks for sharing. much more confident on my ac install tomorrow lol
You got this!
Thank for all your videos they have helped a lot
Glad to help Steve!
Question. I had two 3/8 hoses hooked up with 3 valve core tools with the micron gauge and I was able to pull to 390 microns but when it was finished & I went to isolate the vacuum and close the shut offs, I was instantly losing like 300 microns then it would hold. it passed nitrogen test also any ideas of what was happening?
I vacuumed my mini split down to 150. It rises 1 micron about every 10 seconds. Should I just run the vacuum longer or wait and see what it stops at if it stops?
Thank you for this fine video. Can't help but learn from it. I had a misfortune on a Service call. Hard lesson. Vacuum hoses didn't have Check-valves. Started the evacuation process and took a lunch. The Vaccum Pump blew the circuit breaker and the line-set sucked the oil out of my vacuum pump and contaminated the whole system. Was a bitch or flush out and recharge (R-22). Didn't make any money that day. Never gonna do that again! Anyway, thanks for the video.
This was an informative video. Love how you made It easy to understand.
Thanks a lot John!
@@acservicetechchannel
Hi there. Is it normal when pulling vacuum. You turn the vacuum off and the vacuum doesnt hold the pressure??
From your experience. If you have a leaking flare nut on the line sets on the mini split unit that loses gas every season. We're during the upcoming season you fill the system up topping it off, and have done this three years. I've noticed that the system now doesn't cool as well as it did when I first installed it. In your opinion and experience. Could the unit have taken in air affecting the performance of the unit. Where it would be a wise thing to remove all the gas and pull a new vacuum and install new freon to get it to cool the way it did when it was first installed.
Hello there, I the vacuum on the new system as per this video. Than ready to open service valve on suction side. Open the valve cap to do so. I lost the vacuum in the line set. What I'm doing wrong..? Thanks
Perfect work!
Thanks William!
You opened service valves with wrench to break the vacuum. But I never saw you close them back up. Could you kindly explain!
You don’t close them back up. Opening the service valves is what allows the refrigerant to run through the system.
Hi, after replacing a suction line and liquid line service valve do you perform the vacuum with both valves open? If so, wouldn't the vacuum pump pull compressor oil out of the system? Thanks
Absolutely love this video and also the comments. This is kind of a physics question: When drawing a vacuum from both ports simultaneously, is it possible the vacuum can work against itself? Hope the question makes sense. Thank you.
So quick. I gotta start doing it this way
Great explanation!!
Great video 😁
Thanks Phillip!
One question when doing the vacuum pump pressure test do you also have to take out the piston in the coil or do you leave it in there??
Well done - thanks!
Thanks great video
Thanks Darren!
Would it be best after reinstalling the valve core to pull the stem back and valve off before removing the stem of the tool, just in case the valve core didn’t seat correctly in which case refrigerant would be release from the system. If you valve it off first you have full control of the refrigerant? Hope that made sense.
Great video thanks a lot helps when you forget lol also helps for the apprentices
Glad to help!
super video thank you very much
Thanks Mike!
I have a question about the vacuum procedure, when pulling a vacuum and I have a fixed orifice, should I remove the orifice to perform an oil blowout and leave it out during the vacuum pump or just leave it in? Its a R22 and I'm retrofitting for R422B
I have a question. I am new in the field and I am servicing a system after somebody cut the lines to steal the condenser but couldn't leave with. So there is no refrigerant left in the condenser. After brazing the lines back how to proper vacuum the system before adding refrigerant. It's a R22 system. Thanks for any advice.
You would pressure test for leaks first. You would perform a vacuum like this and then weigh liquid refrigerant into the high side like this. Then you would check the charge with superheat or subcooling accordingly, thanks- czcams.com/video/ncgLDYrvN6w/video.html
Excellent
Fellas! I need an advice. I vacuumed the 16 ft long line. Left the manifold connected. (While having the low pressure blue valve shut). After 1 hour, I could see the needle was going slightly down. (To -29?). After 10 hours, the system pressure goes back to 0. The question is, if this outcome normal? Online I read people say 15 minutes is enough to test lines with vacuum. Does it mean I loose vacuum due to the manifold connections? Or is there a great chance of a leak?
Thank you!
Dear how about if the system has capillary tubes and the superheat is very high and the sub cooling is normal within manufacturer range and the ac isn’t cooling the room properly. should I replace the filter drier and capillary tubes . I am not a technician and I just want to diagnose the issue .thank you
Hi , Do you have a video on vacuuming a 4 zone 36000 BTU mini split , 4 9000 BTU INDOOR UNITS ..
Do you have to vacuum line sets individually or is there a way to do it in one shot ?
Thanks
Love the different service wrench sizes..they have 3
Ha ha, that was the correct size but didn't quite fit well, the smaller two sizes were certainly too small thanks!
Working on my 2005 honda crv. Holds vacuum, however, When i remove lines from the high and low side. They both start sucking in air thru the fittings. Whats causing this? Im removing lines properly.
The question I have to ask is: is this kind of vacuum produced when the machine is fully charged with freon? when making a vacuum on a repair due to a change of compressor it can be done or in that case if it has to be done with the set of pressure gauges on. I appreciate the attention provided .
When vacuum testing a dry system, I can reach 300 microns for thw line set, but when I open up the service valves on the outdoor unit, I can only achieve 1000 micron. Is there something in the component that prevents it from reaching
I always use fresh oil on each vacuum. And some systems need the oil changed after 5 min of run time. Apion..they are the best core tools..love them. How about a triple purge? Also I use the t and 3/8 hoses on my REFCO..9cfm.
I don't do a triple evac if the standing vacuum holds at the 200 or 300 micron level. This proves the moisture is gone. Yeah those appion's are awesome, thanks David!
Can I still perform recovery, vacuum, etc with valve cores in because my 2007 Goodman heat pump and ac unit valves are side by side and an appion valve core removal tool doesn’t fit?
how to quiet a TXV DURING DEFROST on a new outdoor condenser sounds like air brakes. Is there a way to quiet it or wire it so the heat scripts come on instead of that air brake sound?
My ac wasnt cooling so i hooked up some gauges and there was a vacuum. Compressor and condenser fan were operating normally. This is an r22 system. What are your thoughts about the vacuum and converting to r407c? Thanks.
If there is dye in a system does it evaporate. In other words will it affect getting it to hold a low micron level?
Good job!
Thank you. Very good video.
Thanks Kenny!
Does the pump also gets rid of any left over freon in the copper lines if you'' re replacing an R22 condenser To a 410A condenser?
Love this guys videos
Thanks Timothy!
May I ask what is the purpose of opening the gas valve and close it after machine started? Can the gas valve be left open? What is its purpose anyway? Tks
Great video thanks for sharing
Thanks Brian!
Very good instruction. Could this process be done with only 1 valve core removal tool and 1 hose ?
Great video.
I have this same setup with 2 1/2” hoses and my vacuum never holds but I don’t think I have leaks bc it passes pressure test. I check with soap bubbles and I’m pretty positive there is no leaks. What am I doing wrong?
Why not 3/8" lines on both the liquid and suction lines. How long for the blowout? Thanks for these videos.
When do you use the clamp meter to measure the "A"
Are there any problems cross threading a Schrader valve using the valve core removal or does the tool help align the valve properly?
A true professional.
Thanks James!
..only, if he did'nt use a hammer on that outdoor unit :) (funny) :)
Question, the AC condensing unit is isolated when running a vacuum correct? unless there is no refrigerant at all in condensing unit?
4th time I’ve watched this. Thanks man I’m an apartment maint tech so I don’t get to do this very often
Awesome, I'm glad the videos are being used!
Ok first off great video. But I have a question, it's a 60-65 ft lineset and the outdoor comes orecharged for 15 ft of lineset so 45-50 ft * .6 Oz per foot needed how did you add the 27-30ish ounces of 410?
Thanks for showing how to do vacuum test and a leak check
Am I to understand that the two vertical core valves are closed during these procedures eliminating the compressor? In other words, just the tubing from the valves thru to the evaporating coil are tested?
Why did you release the refrigerant by opening the low side first ?? My helper did it once and it made a loud hissing sound like something is leaking. Thank you for sharing your knowledge and experiences.
Only thing I do different is adding a wireless transducer on the non-micron gauge core removal reference and only pressurize to 20ish psi. Allows for easier core install and lower de minimis.
Another great video
Thanks a lot Luis!
What if you need to add refrigerant? Can you just use either of the top valves on the Apion Schrader removal tool?
I had a method for pulling vacuum...even used it to check for leaks...and later found after isolating the condenser & filling it with Nitrogen, that it would lose 3 pounds over a 24 hour period...I just upgraded to a digital manifold & will purchase 1 more Appion valve core tool & try your set-up :)
Yes I love this setup. I just did a new install today and once set up, it took only 3 minutes to get to 190 microns and the standing vacuum test held 20 microns above that for ten minutes. It works well and usually takes between 3-10 minutes to get the level low enough, thanks
How much should the micron reading increase after you're done pulling a vacuum?
Thanks for all your videos. Very helpful! Could I pull a vacuum from just one service valve using one hose? Is it just quicker to use two hoses or is there any other reason. I know smaller mini splits only have one service valve anyways.
Minisplits have the metering device for the evap at the outdoor unit so there is no restriction halfway down the line like on standard split systems. That is why we pull from both sides and it is faster and you microns readings will be more accurate. No need to on minisplits, thanks
Is it better or recommended to put micron gauge on discharge side of the core remover since its the furthest from the vacuum pump.
Your video is the bomb.
would it be good to put the vacuum meter more up, to avoid oil into the sensor
Great video, thanks for posting. As far as breaking vacuum goes, I understood it to be a bad thing to open the service valves. I was told this is because the vacuum could pull too much oil out of the compressor. Am I operating on bad information? Also, I've found that the cooler you keep the service valves (while brazing), the easier they are to open.
It certainly doesn't hurt to break the vacuum with refrigerant from the bottle. The manufacturer will usually say it is ok to open the service valves to break the vacuum. They tell you which one they would like to open first to avoid any oil lost into the tubes and out of the compressor for the initial startup, thanks!
Best videos out there,,,,I have a question what side you open 1st when you install a condenser..low side or high side?and do you need to break vacuum? Or can I open valves with unit in vacuum?
Can you put the Schrader valves back in before breaking the vacuum?
man you are a BEAST! I watch all your videos and You are making me a better technician. Ac is my passion but i’m really into ice machines…. Do you have any videos on Commercial isomatics or Mitsubishi’s? Contact dealing with harvesting motors or timing relays. I also have really enjoyed learning walk-in freezers in about the defrost termination any kind of information on that we’d love to see it