HVAC Tips to Avoid Vacuum Problems! Top 15!
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- Опубликовано: 16 июн 2018
- In This Video, I go over The Top 15 HVAC Tips for Solving Vacuum Problems. After Pressure Testing Refrigerant Lines, we need to Dehydrate the System below 500 microns in order to prepare it for the Addition of Refrigerant. I go over Tips to make the Jobless Frustrating, Less Time Consuming, and Increase Productivity! You can also add a dab of vacuum pump oil to the rubber grommets of the vacuum hoses but make sure that none goes in the vacuum gauge. Supervision is needed by a licensed HVAC Tech while doing this 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
Here is the Link to the Appion Blue 3/8" to 1/4" Vacuum Hose- amzn.to/2uYlVyc
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
Here is the link to the pack of 25 C&D valve cores- amzn.to/2J1lurm
Here is the link for the C&D Valve Core Wrench, Container, and 3 valve cores- amzn.to/2EVGkps
Here is the Link for the newer UEI DL479 Multimeter with temp sensor- amzn.to/2jtsUbJ
Here is the Link for the FieldPiece ST4 Dual Temp Meter- amzn.to/2AhR6ph
Other tool links can be found in the video description section.
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i know im asking randomly but does anyone know of a tool to log back into an Instagram account..?
I was dumb lost the password. I would appreciate any tips you can offer me.
@Xavier Richard Instablaster ;)
@Chase Leonel i really appreciate your reply. I found the site on google and im in the hacking process now.
I see it takes a while so I will get back to you later with my results.
@Chase Leonel it worked and I finally got access to my account again. I'm so happy:D
Thank you so much, you saved my ass :D
@Xavier Richard You are welcome :D
Dude your way better than any instructor I’ve had in technical school. Kudos
I am glad you are enjoying the videos, thanks!
It's you're not your. Does that mean I'm a better English teacher than you had in high school?
@@andrewchondropoulos1267 lol
Also make sure to have a dab of refrigerant oil on the rubber grommets of your vacuum hoses. Some people use Nylog for this. I just use refrigerant oil. Make sure to not put a dab of oil on the micron gauge connections as you don't want any oil close to the micron gauge sensor, thanks!
If I accidentally did a pressure test on a system with nitrogen with a hose that I used for charging a system and introduced refrigerant oil into the system through the hose to the linesets will that effect me from getting a effective vaccum
Can mineral oil be used universally to lubricate service valves and o-rings? I'm just gearing up to install my first mini-split and love your video's. It's a Sennville multi zone and only has one side to pull vacuum on the service valves and I watched your video on that. I want to buy your training book and I'm wondering which bundle or package would be best for working on primarily mini splits?👍👍👍
Very logical line of videos. Bought your troubleshooting book and appreciating your experience. Starting my own business soon and found your channel relevant in that pursuit, and in my daily work in the meantime.
Watched again, your a class act!!
World class instruction.
Thanks a lot James!
As always great video. I appreciate the time and effort you put into your videos.
Thanks MC!
Another very informative and useful video by AC Service Tech !
Thanks Mason!
Another informative & well-explained video. Keeping everything together in a vacuum kit makes a lot of sense. I mark the hoses that I have pulled the cores out of with zip ties...it let's you know immediately & you can always cut them off if you ever need to reinstall the cores. I think lusing your oil blowout method may also help remove moisture. Did you mention cycling the valves on the core removal tools during the vacuum process in this video? Again, thank you for putting this information together & sharing it.
This channel is so helpful. Thank you. We appreciate you🙏🏻
Thanks a lot Leo!
Love the info and the 3 valve core puller setup.
Thanks Mr Tech for sharing
your expereince it is very well
explained.
Thanks Edwin!
Hey brotha, I'm a new man. rep who's new to the industry, and this is my first time viewing your work. I appreciate your attention to detail and correct instruction.
Thanks a lot Lonnie! Check out the website for articles as well, thanks
Very good detailed instructional video.
Thanks JD!
Great explanation!!!
Another thing to consider is not allowing the micron gauge to be leaning down allowing oil to be pulled into it getting it dirty. Dood your videos are on point your have the whole game on lock thank you thank you knowledge is power and your sharing that
Great Tip, thanks Chuck!
Thank you for sharing this. God information and simple to follow.
Also.. always have your micron gauge upright. Keeps oil droplets out while vacuuming.
Great Tip, Thanks TurboFlush!
So much to learn and so little time.
Ha ha yeah!
I’ve been going crazy on the vacuum lately, it’s a fun trial and error finding new ways to get it down quicker
Learn so much from you. Thank you
Happy to hear that!
Great help, thank you so much.
Thanks Shawn!
Thanks!
Great video thank you
Thanks Ron!
لايوجد فني تبريد بالعراق لديه مثل هذه المعلومات او الادوات التي تستعملها انت مدرسة في عالم التبريد استمر استاذ
Another Great video 😜
Thanks Phillip!
Great video as usual
Thanks Juan!
Hello to all,
The picture is my wife.
Just installed my first split 3 ton system. New air handler and outside unit precharged with 410A.
Brazed in a new line set with filter dryer at air handler and sight glass on liquid side outside, using Nitrogen at 3CFM.
Charge system to 400 psi with Nitrogen for 10 minutes and bubble checked for leaks. No loss, no problems so far!
Time for vacuum test! I have a 6 CFM Yellow Jacket pump with new oil, 3 Appion Valve Core removal tools, new CPS Micron gauge, and new Yellow Jacket 4 hose gauge set.
Valve cores have been removed since the brazing process. Set up the 3 Appion tools with CPS gauge as seen in video. Using only one 3/8 vacuum hose from pump to 4 hose gauge set, took about 30 minutes to pull down to 400 microns. Closed the 2 Appion valves with pump still running and starting losing vacuum. Checked/tightened all connections and opened valves again.
Pulled back down to 400, then with pump still running, closed valve to gauge only. Losing vacuum. Opened the valve, back to 400. Then it is starting to RAIN! Closed the valves and turned the pump
off and got everything under cover. Checked/tightened all connections, still losing vacuum and still raining. So with the test of closing just the valve to the gauge only and still losing vacuum, doing a 10 Minute test was not doable. I figured give it one more pump down to 400 microns, put the valve cores in, remove the CPS gauge and release the refrigerant to the system, put the tools in the truck and go home. When I got home, I saw there was vacuum pump oil in my gauge set lines. I checked the oil level in the pump and it was at the bottom of the sight glass.
OK, now I have vacuum pump oil mixed with refrigerant in my new system! What would you do?
Thanks,
Ricky
Great video, thx!!!
Thanks Willian!
Good tips
Thanks Kenny W!
I whole heartily appreciate your knowledge, and your help.
“ I’m just a hand 🖐🏼, trying not to be a foot 🦶 “
Thank you very much twoninecav!
good listen, thank you ...
Thanks Pei Broker!
Thanks nice video
Thanks Jonathan!
Good tips!
Thanks Bernie!
Awesome videos and really appreciate the channel. I have a question about what to do with a problem with an o-ring leak on a front seated low side vacuum service valve. The outdoor condensing unit is new but old stock and has never been put into service. I have brazed in the line-sets and can pull a deep vacuum from a service port at the evaporator coil, but the moment I remove the service cap on the outdoor unit, that vacuum is immediately lost. It is obvious that as long as the outdoor service valve caps are installed, I can keep the vacuum, but once I go to access the allan key low side service valve to release the pre-charge I can't get there because I immediately lose the deep vacuum within the line-set and indoor evaporator (it's a Trane air source heat pump that I am working on). I'm wondering about whether I can pull a deep vacuum on the system, and instead of releasing the pre-charge through the low-side condenser service valve maybe I can do this on the high-side condenser service valve just enough to create some positive pressure within the system (to maintain the vacuum). Then maybe I can return to the low-side condenser service valve and finish releasing the pre-charge and applying either refrigerant oil to wet the leaking service valve o-ring (and hope it seals), or apply Nylog and hope that I can seal the o-ring in this manner. Again, I can maintain vacuum if the service valve cap is installed, so my o-ring leak is obviously small but still significant in trying to put this unit into service. If I can somehow address the o-ring issue by wetting the service valve o-ring, or by using Nylog during the back-seating process (when releasing the pre-charge in a slightly pressurized system enacted through the high-side service port) then this might save me from having to do a complete evacuation, and the headache that comes with brazing in a new service port and the lineset heachaches that come with all that. Any ideas, from anyone who has already dealt with this type of situation?
JB Vacuum Pumps!!! Best in the business!
Thanks for the vid. I've had an issue recently with pump oil being drawn back up into the hose attached to the liquid service port. Any tips on how to stop this?
Great tips! Enjoyed the video. The Bluevac micron gauges are designed to handle positive pressure up to 500 psi specifically so pressure can be put back into the system prior to removing the micron gauge. Im not sure of other manufactures. Keep up the good content!
Yeah the cps ones are also rated for high pressure but I just try not to foul up the sensor with any refrigerant oil. Thanks for what you are doing for newer techs in the field HVAC in SC !
@@acservicetechchannel
Sensor fouling is easily resolved . IMO
Bluevac all the way and the higher price bluevac has a 2nd reading which will inform you if your actually pulling down a vacuum. Example when liquid refrigerant is degassing out of oil in compressor the gauge can see it.
How do you accomplish that sir? @dgsrks102030
Excellent tips!!! ~ Good vid! I think is best when possible to have specialized set ups for different procedures as explained!!!
Absolutely, thank you very much KungFuMaintenance!
Good video happy Father’s Day
Thanks Chen Chris!
Hey Craig, for tip #3, could you switch the position of your micron gauge and hose on the removal tool? Take the cores out and be able to valve off the micron gauge once vacuum is complete?
creategood video good information greetings from argentina
Thanks Sergio!
Excellent!!!
Very useful tips!
Thanks Mico!
Great!!!
Thanks Boris!
Noticed you have the Imperial manifold set. Really like that manufacturer. In my day, they made a great product. Is Stride still making a good manifold?
Great advice and excellent video.
Sure are, thanks Melvin!
Great videos
Glad you like them!
I'm a service tech also in Texas
Great stuff here. What's the secret, if there is one, to using core removal tool on Fujitsu mini
I vacuum my hoses while attach to the unit before opening up the entire system to be vacuum and utilize the manual low-loss fitting on the hoses, which helps to check the external connections pressure capabilities.
JB tools recently released a VCRT with a slide isolation valve for the vacuum gauge port. I just received it but haven’t tried it yet - same with the vacuum gauge I got tired of using my manifold.
Thank you, I've had 3 technicians come out recently and not be able to figure out the problem. Your videos helped me to help them fix the problem. I'm not placing blame on anyone but if they had your style of teaching in the courses, I believe the field would see much better technicians.
I appreciate it very much Brian!
Pro tip, buy a micron gauge that is rated to withstand positive pressure as well. The one in the video CPS provides will blow clear into the next yard if it sees too much positive pressure
When I have problems with leaking service valves I've used a few drops of NyLog to seal it long enough to get my service finished. I run the valve all the way down (just as you have shown in the video), wipe a long-stick Q-tip soaked with the appropriate NyLog, in the bore, and then re-back-seat the valve back out. This usually does the trick
That's awesome, great job!
Soo... do younpressure test it?
Yes, funny thing is, they typically hold during the pressure test but fail during the vacuum test. That is why we are adding the oil or nylog, thanks!
They typically never hold pressure for me... Ive recently had to do a coil clean on a old system and i noticed I had a leaky valve..... So I didn't know what to do because refrigerant was pumped Down and I count pull the proper vacuum to recover ... So what i did was; wrap the service valve with teflon tape around the threads & added some Nylog and tighten the cap on....and pressure & vacuum held....
So my question is, is there something could of go wrong by doing that?
You were right. like I said in the video, in an instance like that with a pumped down unit, all we can really do is to try to seal the cap on to get our vacuum and break the vacuum with refrigerant using the other valve. After there is positive pressure, we can add the oil or nylog to the moving valve o-ring. You did the right thing, thanks!
Are you recommend using nylog on the connecting part like vacuum gauge etc connection. The problem with many tools observed is that they leak, i was thinking if nylog is help in this case
I have a pump similar to this and it has a pressure gauge on it on the intake and I want to install a regulator. I tried a 1/4" ball valve but it was too big. It seems like it's a male 3/16" connection on the pump after the regulator or something? Do you know the parts that would be the most cost effective way to add a valve/regulator to control the amount of vacuum created? The section of the hardware store I went to didn't have anything smaller than 1/4" female. Should I of looked in plumbing?
Your videos are top notch! I have combed RUclips for installing mini-split systems and many of them are just DYI, which in the beginning was helpful. I am a contractor with little to no experience in HVAC, but I want to install a mini-split in my home. Being a contractor I can do most of the work myself, including electrical. So, I thought I could just call a local HVAC company to come on out and do the pressure test and release the freon. Boy was I wrong! No one will come out to do that for you! They want it all or nothing! I had quotes from $4,500 - $6,500 for an 18,000 BTU split that I could buy online for $1,000 or less.
That is when I thought, hey, I'm a smart guy. I have good aptitude, I'll just learn how to do this myself. That is when I found a lot of information and some conflicting; do a nitrogen pressure test, don't need it on a new system. Vacuum for a set time? No, you must use a micron gauge. You see where I'm going with this.
So now after over a month of studying and watching your videos I believe I am ready to install my unit. I do have a question. I am installing a Pioneer unit and after contacting them regarding installation, I was informed that as long as I follow their provided installation process, the unit is covered under warranty. They, however, do not require a nitrogen pressure test, just an evacuation for 20 - 30 minutes, then let it sit in a vacuum to see if pressure rises indicating a leak. Do you think I need to pressure test anyway and use a micron guage for evacuation which they also do not require?
Thanks again for your great educational videos.
On a minisplit, you will need just two valve core removal tools and a micron gauge. A single hose to the vacuum pump is good. This is because the txv is in the outdoor unit and there is no restriction half way down the line at the inlet of the evaporator coil. Do the vacuum the same way I do in this video with the two valve core removal tools attached to each other with the micron gauge hanging off of it. I would do the pressure test but a standing vacuum test for ten minutes with the pump off to see if the vacuum rises will also be a leak test. make sure to use refrigerant oil or nylog for the flare joints and use a torque wrench to the specified torque need. I have all the tools linked at amazon.com/shop/acservicetech make sure you are EPA608 certified to handle refrigerants, and here is the video, thanks- ruclips.net/video/wYZ8Wudksb0/видео.html
Thank you again, I am all set, already ordered my mini-split and all the equipment. I do have one other question. I see that most people connect these with 2 pole 20A breakers run to a 30A disconnect is that what you would suggest? The specs on the pioneer indicate that it does not pull more than 7A to heat or cool.
BTW, I would like to donate to your channel, do you have a way for one time donations or just Patreon, not sure how that works. Thanks again, you channel has been great,
There should be a rating on the rating plate of the unit that would say max fuse or max breaker. You would install that breaker size along with a wire that would be rated for that breaker size or higher. If you do that then you could install a disconnect that is non fusible or fusible with the same size fuses as the breaker. If the breaker and wire that is existing were higher sized then you could fuse it down at the fusible disconnect. Most disconnects are rated as 30amp or 60amp in fusible or non fusible models so you would be using a 30amp one. We just go by that max fuse or breaker size listed on the outdoor unit. You could support through paypal.me/acservicetech and also buy purchasing anything on amazon after going through the amazon.com/shop/acservicetech link and the items purchased do not have to be any item I have linked on the page and the items will be the same price as normal on amazon, thanks Erick and glad to help!
Yes, I knew it would be on the unit, but I thought I could save some time by getting my wiring done before it arrived. Sent you some coffee money... or beer :)
Ha ha, thanks. You might be able to look up the specs sheet by doing a google search of the model # or contacting the manufacturer, thanks Erick!
Can non-condensibles enter compressor and oil and if so, what’s your idea on removing?
What do I do if I’m getting bubbles in the vacuum pump sight glass? Working on an automotive R134a system, if that matters. Vacuum pump was overfilled. Got the level right and it’s a lot better but still some tiny bubbles.
Hey Craig!
How are you doing. Great tips!
Question: what would cause an excessive amount of oil at the vacuum pump fittings/hoses? Noticed there are times when vacing a new system the hose to the vacuum can have an excessive amount of oil. I’m assuming it’s the vacuum oil? The vacuum pump would have the right amount of oil.
Maybe it’s the pump?
Really enjoy your passion for the trade!
Thanks!
It sounds like the vacuum pump you are using does not have an oil check valve or that it is stuck in the open position. Older vacuum pumps would have the problem you are discussing. It would draw the oil up into the hoses, thanks!
The GOAT of hvac training! I recently purchased all new vacuum set up with the tools you suggest with the exception I got a Field Piece micron gauge instead of CPS. On my first attempt in the field I couldn't get the vacuum to hold so I went back to my old way of doing it and got the job done. Afterward I hooked my two Appion removal tools and micron gauge directly to the vacuum pump as you would to the vapor line of a system and same result it would get down to less than 100 microns but it wouln't hold under 500 microns. Everything is new, I used Nylog on every connection. I even rotated out the 2 removal tools with the 3rd one and I exercised the shut offs before I actually shut off the vacuum and still no success. Any thoughts?
It could from the air stuck in the valve core tool's valve. Did you close them once or twice during the vacuum and then open them back up quickly. It could also be the particular vacuum gauge, thanks and check out some of my other vacuum videos where I show step by step using them.
@@acservicetechchannel Thank you for the reply I don't know how you find the time. Yes I opened and closed the valves several times. I've watched all of your vacuum vids over and over. I'm thinking its the gauge as well. It's a brand new Field Piece I think I'll take it back and try a CPS or Supco. You are awesome and great at what you do. You inspire me to want to do what no else is doing and hope to be able to teach the way you do one day.
What should you do if you accidentally suck in refrigerant in the vac? Thank you very much!
I was originally taught, way back when, to change vacuum pump oil after every evacuation. Pro's outweigh the con's on why so often, so thats what I try to do.
i work on small appliances(less than 4lbs of refrigerant) that only have a low side port so there is no 2-hose vacuuming option, and adding a high side port is usually impossible due to the design of the equipment. i have experienced water freezing in the system when using a powerful high-cfm vacuum pump, so now i use a cheap robinair single-stage that pulls the vacuum slowly, which prevents the system from freezing up. i do occasionally get the oil blob in the evaporator and the rising-falling micron reading, when i see it happening it just means a few more hours of pumping to get the system below 300 microns. yes, hours... this is due to the small tubing sizes i work with, 3/8" and smaller. most common failure i deal with is a fractured suction line that vents the refrigerant and then allows the compressor to suck in air and contaminate the entire system with it. and no low pressure cutout switches on most of the equipment so eventually the compressors burn up when enough oil leaks out of the system.
Yeah I was mainly speaking to larger systems but the water likely would not freeze if you left the door to the freezer and refrigerator open with the inside fan on. The freezing likely occurs when you have removed the heat from the tubing and the tubing cannot absorb more heat. Yeah small appliances like that are a little different that air conditioning, thanks Marzsit!
on automobile applications I have been using pag oil in my vacuum pump. is there any problem with using this? Also I want to get a simple digital micron gauge to know when the system is dry and for leak testing. can you give me any advice? thanks. I would just be hooking up to r134 service ports. on my gauges i bring it to -28 inches I am not sure what that is in microns. many times i have to flush the systems and i would love to be able to know precisely that i have boiled off all the alcohol, moisture and know there are no leaks. most of the time i just pull a deep vacuum for a few hours then let it sit and see if the vacuum gauge shows any leak but this is time consuming.
17-18 min hilarious. Thanks for the laughs 😂
Daniel what does that mean?
@@acservicetechchannel o you just repeating yourself at the end. Couldn't make up your mind which ending sounded the best. Probably didn't notice it until you put it up that you included several re recordings.
Ha ha wow, thanks and you are the first person to mention it to me. Thank you very much, wow!
hello sir i am from Indonesia. may i ask one thing if ac split unit no more gas or refrigerant at all . when we vacuum.the system should we open service valve and high pressure (small pipe) valve all the way? thanks
I just purchased a used one and turned it on but the vacuum suction was pretty low but it did suck. The oil was low. Could this be the cause?
Do we store these with oil or drain oil out before storing?
Another Excellent video..just wanna ask how to vacuum a unit fitted with EXV..pls reply
If you are talking a minisplit, you would just use one line going to the two valve core removal tools that you have mounted together on the one suction port with the micron gauge on it. The exv is located in the outdoor unit so there won't be a vacuum restriction half way down the line at the evap coil, thanks
acservicetech thanks so much for the info..cheers
Do you have a link where we can buy or rent a small 10 or 20 pound DOT approved Nitrogen tank & gauges including places where we can fill it per state too. Thanks!!
I love my sman 380v manifold BUT the low side valve leaks at anything below 1000 micron. I have done the dielectric grease mod and it's still leaking. Someone should make an aftermarket replacement valve kit with tighter orings. I tried using a slightly larger diameter oring but it wont seat without being cut on the sharp lip inside the valve. Rounding the lip or making the inside barrel of the valve a few thousandths smaller would help alot.
I wish I had one of those removal tools. I just installed my condenser,txv,new coil,3/4 line set. I use the sman 460 micron guage....not the most accurate but I kinda fudge it a little.
Those 3 valve core removal tools have become essential to me for vacuum and recovery, thanks Jason!
We use VCR very rarely. Normally we remove a valve core with screwdriver style core remover, then reinstall after you've charged to about 5psi.
No VCR required
@@Froggability same 🤙
Hello great video! I have a question. The oil in my vacuum pump wasn't changed for a long time and now it overheats and shuts down. I found wires on the motor melted through, probably because it is working too hard and overheating. If I replace the seals in the pump and flip the impellers, will that help the pump to run well again or is there something more that could be damaged? P.S. the oil is now changed :)
It is possible. I have found that after running bad oil for a while, the pump may not be able to get a deep vacuum even after the oil is changed a couple times with new. It may be worth a shot though! If it doesn't work I have the pump I use linked at amazon.com/shop/acservicetech and cps has a decent price on a 4 cfm-amzn.to/2I9ca7A -I still think it may be worth a shot though, thanks!
At 8:17, how can water freeze in a system when decreasing system pressure? Aren't you lowing the boiling point of any water present in the system?
I'm a newbie, but when you're pulling a vacuum in an already charged system that has a leak you want to repair, are you vacuuming all of the liquid refrigerant into the compressor and tightening the allen key/hex valve of the liquid line thereafter to isolate the liquid refrigerant in the compressor OR are you vacuuming all of the liquid refrigerant into an external recovery tank rated for your R rating? Thanks!
You could either pull the refrigerant back to the condenser & isolate with the service valved or use a recovery machine to move it into a recovery tank...it really depends on the repair...I hope this helps
How can I use a two hose evacuation on a mini split? ;)
You don't have to since there is no metering device at the indoor coil. Vacuuming from one side is good for them since the metering device is in the outdoor unit, thanks
Do you have merchandise like shirts?
Just want to know what kind of tool you used to remove core depressor from the hose?
Depending on the valve core manufacturer, a valve core removing driver will work or you can use needle nose to unscrew it out, thanks!
Big fan of your channel been seeing this problem maybe you can help? I work for Vending Machine company and been seeing 1 or 2 refer units they bring with low charge. And I nitro test them and holds for 30 mins plus I put 205 psi in them. And they drop to 500 microns and hold there vacuum. Have in mind they have no service ports so I add them on.. So how is possible for these to units to low charge if there is no leak? And units they bring are like 7 to 10 years old mind you. Have you ever come across this??
You could do the pressure test with a digital gauge set to see small incremental changes. If the system holds vacuum for 10 minutes then there shouldn't be any leaks. You are putting on brazed or sweated on ports correct?
Hey I’m getting your set up but instead of getting the cps I think I’m going to get the $200 BluVac+ Micro Wireless Digital Micron Gauge with Coupler and Bluetooth it’s the mini affordable one they sell what do you think? Sounds much better than cps and field piece from my research.
I actually ordered the blu vac+ LTE looks like a great product a bit spending I will update on how it works. Thanks for all theses videos my vacuuming down systems will be much better I’ve been taught to use my field piece gauge manifold for 3 years now and it’s time for a good vacuum set up.
Will one valve core removal tool size fit in both lines??? Or do I have to buy one for each line?
You need AT LEAST two. Hooking up a vacuum pump, micron gauge, and manifold (or refrigerant line) is too many connections for one port, on one valve core tool. Doing it with three valve core tools, like the way shown in this video, is how I do it... and it's bullet-proof. No chance of ruining the vacuum, you worked so hard to get, by changing lines before you re-charge. Just be SURE to exercise all the valves while you are pulling the vacuum. Nothing more frustrating than have your micron gauge shoot back up when you shut the valve (to keep refrigerant out of the micron gauge).
Yes Alex, you would need three valve core removal tools. The same size typically fits on both sides. For residential light commercial, we use 1/4" ones. I have them linked at amazon.com/shop/acservicetech - Check out "acservicetech vacuum playlist" for more vacuum videos, thanks
Thanks Leo!
hi, i have an older vacuum pump that exhaust at end of handle. At beginning of start up i see my gage goes to 29"hg really quick with some vapor exiting end of handle ( i can feel the pressure coming out with my finger). But after about 10min of running time it's almost like nothing was coming out end of handle anymore. I couldn't feel any air pressure coming out at all. However, my gage still reads 29"hg. Is my pump defective? thanks.
After 10 min it's pulled out 99% already. Your machine is probably not defective
I wanted to prepare and finalise my self install on my Mini Split System Installation (needing longer line set and additional freon put into the system by a HVAC Tech) awaiting the HVAC tech appointment next week. Would you happen to know if its ok to uncap my line set and install on one end to the (Head Unit ) and not finish the startup till the xtra freon is installed? Would there be any issue with existing moisture in the lines from sitting for a week or so?
As long as the line set is not sitting open it is fine if it is connected to the indoor unit, thanks
@@acservicetechchannel Thanks!
Hi I bought 2nd hand Samsung mini split my question is that on my service valves I can only connect gauge or vacuum pump to low pressure side there’s no connection to high pressure side how do I deal with that how to vacuum it how to know what’s pressure like on the high side maybe it’s just stupid question but I’m learning it thanks for help
You can vacuum on the low side port only since there is no metering device half way down the lineset at the evap coil. It is usually in the outdoor unit on minisplits. We used the total weight method to verify the charge. It is by the weight listed on the rating plate of the outdoor unit and shows the max cumulative length of line set that is included in the factory charge, thanks!
Bluevac micron gauges are rated for refrigerant pressure so you don't have to valve them off
Hey Joe, I believe they all are rated for high operating pressure in case of an accident but we don't want to cause a leak and we don't want to get refrigerant oil on the sensor. BlueVac is a great pic too, thanks!
Hope someone can answer this!!!
What are the pros or cons of removing the valve core with a regula screwdriver compared to this fancy one
If the system is empty then you can remove the valve core with any tool but you must have the valve core removal tool attached to pull the vacuum through it and to put the valve core back in after the system has positive refrigerant pressure, thanks!
HI these tips for Gas 22 or for Gas 410 .thank you very much .I am from Iraq
Yes these tips are for a system preparation, regardless of then refrigerant type used, thanks!
How do you like that pump on the video?
When you say pull it down to 500 microns is that the same as 29 in of mercury? Thanks!
500 is 29.9" and to give you an example 4000 microns is 29.76" so always make sure to use a micron gauge and not an hg gauge, thanks Blade!
What's confusing me is when I find a conversion calculator and punch in 500 microns it converts to .01968503766106 in Hg.
Thats wrong then. Go to refrigerants.com/pdf/NRI-PTCHART.pdf That is National Refrigerants. They have a micron to HG conversion table that will explain, thanks Blade!
Your calculator is giving you "Absolute Pressure" (referenced to 0.0 being an absolute vacuum). Gauge pressure (what us old HVAC techs use) is zero-referenced against ambient air pressure, so it is equal to absolute pressure minus atmospheric pressure. We just omit the minus sign. If you do this stuff day in and day out...the convention makes sense (to us, anyway) because it's the way our gauges communicate pressure information to us.
Thanks man! That helps a lot! Maybe the conversion calculators I've found aren't even dealing with vacuum. They all pretty much give that same answer though.
.0196 microns of mercury = 29.9 in hg.
Do you which valve core tool I would need for m hvac?
Did you mean MVAC for vehicles? or for buildings? For buildings I use the appion valve core removal tools. I have them linked at amazon.com/shop/acservicetech thanks
is the smaller vacuum pump you list on your Amazon tools large enough for residential units?
Yes the 3cf would be fine. It is more about using the three appion valve core removal tools to remove the restrictions at the valve cores than the size of the vacuum pump, thanks
@@acservicetechchannel three tools? only see the valve core removal tool?
Yes I use three appion 1/4" valve core removal tools, two hoses, and the cps vacuum gauge for all of my vacuums. Check out the video "acservicetech full vacuum procedure", thanks!
@@acservicetechchannel will do, thank you
is there any way to avoid using second valve core removal tool for a vacuum gauge?
Not unless you do what some people do which is either contaminate the sensor of the vacuum gauge with refrigerant oil or replace the valve core before breaking the vacuum with refrigerant which I would not recommend, thanks!
Use a ball valve instead of a VCR
Cps micron gauge is rated for 400psig ... I use the side port on appion crt and release the charge then pull the gauge off
Thanks Dennis, I use a third valve core removal tool to valve off the gauge to try to avoid any excess pressure or the potential for the sensor to get dirty with refrigerant oil, thanks.
Do you know why I'm getting vacuum pump oil in my hose when I finish vacuuming my ductless AC system.
Your vacuum pump must not have a check valve. Older pumps used to do that but newer ones usually have a check valve to stop the oil siphon, thanks!
You turned the power off too soon
Altitude effects how much vacuum you can pull. I am at about 5300 ft above sea level and can only pull 25 inches of vacuum. No matter which vacuum pump I use.
If i pull a vacuum to 34 microns without a valve core remover do i really need the valve core remover
No
Accutools BluVac micron gauges can withstand up to 500 psi . Pretty unlikely to freeze water unless you are using massive hoses and a big pump. Usually if do have any ice sublimation will take place. Triple evacuation is a waste of time.
Yeah the cps ones are also rated for high pressure but I just try not to foul up the sensor with any refrigerant oil. I agree completely too. Thanks for what you are doing for newer techs in the field Ulises!
AC Service Tech LLC for sure. I wish your channel was around when I was getting started. Keep it up.
Thanks a lot Ulises, it means a lot!
2 stage 12 cfm or larger is the best
Happy father's day
Thanks Ron! Happy Fathers Day to you too!
My LG smart inverter doesn't have a service port how do u vacumn ???
It should have a service port on the vapor side. Mini splits usually only have one port, thanks!
@@acservicetechchannel thank u but the LG split system is multi zone and it's doesn't ,,have u ever used an online service tee ?? I saw one on another system today
Adding new seals to old removal tools makes replaceing unit schrader valves valves back onto the unit service port nearly impossible.
Hey Max, the valve core removal tools usually come with the exact size that they have in there, thanks!
acservicetech. Reread comment, edit made.
So you are having problems with putting new orings in your valve core removal tool and you are saying that they are blocking the path of your schrader valve going back in? What tool are working with? Where are the orings coming from? Thanks Max
acservicetech. Yellow jacket removal tools with the same yellow jacket schrader valve seal replacement kit thats usually available at supply house.
acservicetech. How many times do you replace the seals on your removal tools.
how many hp should my vacuum pump have
we use 3 to 6 cfm usually for residential but check out my other vacuum videos where I show the hose setup and valve core removal tools. That is much more important than the vacuum pump size for speed and effectiveness, thanks