HVAC Pressure Testing Procedure for Air Conditioners! Step By Step!
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- čas přidán 18. 05. 2018
- In This HVAC Video, I go over how to Accurately Pressure Test an Air Conditioner. I explain the Step by Step Procedure: where to connect, what to use, where to find pressure ratings at, why, and more in order to make sure that there are no leaks in the system. Supervision is needed by a licensed HVACR Tech while doing this as Experience and Apprenticeship garners Wisdom and Safety.
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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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czcams.com/users/shortsnQ0JNr5kNzM?feature=share4
Is it bad that I learn more from watching these videos than I did in school???🤔🤔🤔🤔
Ha ha, oh man!
czcams.com/users/shortsnQ0JNr5kNzM?feature=share4
Thank you Craig! It’s a real pleasure checking out your videos. You have a real passion for the trade and it’s great to watch.
Thanks a lot Ken!
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Nice clear video with explanation, Craig. Thanks!
Thanks Jack!
Great job explaining and showing proper techniques. I have watched a bunch of videos on this procedure and this is clearly the best on CZcams.
I look forward to the vacuum test process with the micron gauge. Thanks again for putting out real quality videos.
Thanks jimrika2!
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You are a genius. You made this simpler than eating/scooping rice with a spade😂😂😂 love it. Thank you
Finley someone that explained so I understood. Than you
A great and informative video. It helped a lot. Thank you
Glad to hear it!
czcams.com/users/shortsnQ0JNr5kNzM?feature=share4
Excellent
Great video. I like the leak detector with the dauber better than the spray bottle.
Yes Absolutely! Thanks Phillip!
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Thanks for your time..
My pleasure
Love your videos! Im a better installer because of them!
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My compressor has been outside and open with both lines open to the elements. I also emptied the oil. Now I want to check to see if it is ruined. I can braze service valves to the suction and pressure line after replacing the oil, then check suction and pressure with my guages? If so, how much pressure and vacuum should I expect?
Legend!
I'm installing a Daikin multi zone mini split. Compressor has a service valve on the liquid line and gas line. Do I pressure test using both service valves as shown in this video?
Is there anything wrong with going through just the suction side? I do residential installs and some guys have thought it was a leak when it was equalizing after adding nitrogen. When I do it through suction alone I can watch the high side and stop it where I want. I have mixed things about this some say it’s good to do another says it will mess up the txv. Not sure how it would mess up the txv since it bypasses it. We work with Goodman units that have tx*n4’ which are hard shut offs
Hi, I got Samsung mini split on my outdoor unit it shows 3.5mpa as max pressure but I can’t find what’s the max pressure of indoor unit what pressure should it test it with ?
Exelente mr thanks
Thanks Sergio!
Yea Than😮so much 🎉
I had a question, do you go right to charging after the vacuum,or do you release the vacuum first?Thanks
👍👍👍 excellent... video
Thanks Al!
Looks like a short radius copper elbow on the suction line, is that acceptable to use?
Does the little loss of refrigerant when you connect the pressure gauge have any impact on the system performance?
Just want to share a faster and more effective method of leak test. With all valves open, close the valve on the nitrogen cylinder. If there's a leak the right side of the nitrogen regulator indicating tank pressure will drop immediately.
It's best to start with all valves close. Leak test the nitrogen regulator by opening and closing the tank valve with the regulator valve close. To leak test the manifold gauge low and high side the valve core should be installed then use a tool to push the valve open.
greetings how coul i Know the temperatura after the expansion valve
very good ...
Thanks Pei Broker!
Pressure testing with nitrogen is the way to find leaks most of the time however I find with R410a system it doesn’t always work ! I am told that R410a molecules are much smaller than the R22’s or nitrogen’s so they can slip through microscopic cracks / leaks ! If pressure testing can’t find leaks then I use a leak detector !
Thanks for posting
Thanks Mason!
acservicetech You got me thinking about buying this same leak detector as yours !
Does it have any cartridges that need to be replaced from time to time like that H10 model ?
Thank you
The next one I am going to look into is an ultrasonic. Yes they do get changed
acservicetech I see ! I have the UEI RLD10 and I am pretty happy with it but wanted to upgrade it
Hey Mason, I really appreciate your gift! Thank you very much! In reference to the ultrasonic leak detectors, I have heard good things from both Robinair 16455 and Superior AccuTrak VPE-GN Pro however I do not personally have experience with them. I don't want to steer you wrong. I need to do more research myself, thanks
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Craig! After all the steps were taken and now you are ready to add refrigerant to the system. In this case ,Do you add a new poe mineral oil to the system ? ( depending on what type of oil the manufacturer demands)I don’t know if you have a video showing the oil part.🤔🤔
Always 👍🏾👍🏾👍🏾👍🏾👍🏾
Thanks Tank!
Are the king valves closed or opened ?
Hi mate
Just wondering if I close the service valves of an old unit and discharge the pipes vapor refrigerant and then use the existing tubes for installation of a new same unit without replacing the tubes.
Is there gonna be a problem with vacuum process or any other issue?
Thnx
You would need to recover the old refrigerant if it is a cfc, hcfc, hfc refrigerant. If there are no leaks then you could reuse the line set if they are the proper outside diameter, thanks
Hi, got a question. For example if I got a new evaporator and condenser with new copper pipe for AC line and I joined them together that means the line is new and dry so, do I still need nitrogen test and vaccum the line before filling the refrigerant in the line?
Absolutely
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Hi, i have one question which i couldnt find the answer, appreciated if you could help.
Teacher in school said we have to do the high pressure test before the appliance is installed, isolate the piping system.
But i found no one doing that? Everyone just connect everything, then do the test
How many times can you do a pressure and vacuum before releasing refrigerant??
Could you do a video on how to read models for tonnage? I'm sure some would find that useful especially new tech's.
I will keep that in mind Jevin!
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Great vid. Bought some supply’s from the amazon store some good stuff on there. Keep up the great vid s. Kenneth Johnson
Thanks a lot Kenneth!
Hi there, I am new and I am trying to get into this trade, before I take any courses at the college in Lithuania I want to learn as much as possible myself to be able to compare different methods of doing it. I have a question is it necessary to remove valve cores or is it possible to do the nitrogen testing with them inside ?
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Hello AC Service Tech, making a donation for your expertise here shortly! Question. I am Nitrogen pressure testing at 310 PSI...using a fieldpiece SMAN480 digital gauge. What is an an acceptable drop in PSI over time? I'm noticing a 2-3 psi drop per hour. 308 psi, now down to 304 psi after several hours. I leave checked, no bubbles. Isolated from my nitrogen cylinder. Can't find anything online. Do we test for 10 mins and without significant drop, go on to vacuuming down to 250 microns. I don't think I have a leak, but seeing my digital gauges go down is concerning. I've heard temperatures can affect the nitrogen pressure. I have a 90 ft long line set. Really needing to get this AC running...appreciate any help!
Yes it may be falling due to temperature. Usually we only do a 10 min test due to time and then we can also confirm that no leaks exist as well during the standing vacuum test at 250 microns, thanks and I try to spend a extra time answering our patrons questions from patreon.com/acservicetech through patreon or through the email at info@acservivetech.com thanks
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Seeing as you don't like to have your manifold gauge attached when performing a system vacuum, how do you feel about the new 4-port digital manifold gauges?
I use them when teaching just so I can show multiple types of sets so students are aware of each type. They are nice for doing a triple evacuation but like you said, the 4 ports are made so that you can pull a vacuum through them and I don't like to have a gauge set attached when vacuuming, thanks!
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Can you pressure test with schrader valve on ?
Yes just faster wo
Hi I’m new to this. Can you explain why do we use nitrogen and when to use it? I couldn’t find a decent explanation anywhere on the why and when.
It is dry and inert so anything with oxygen can cause another gas to be more flammable. We don't use air for pressure testing because of the humidity in the air and the oxygen. We are trying to dehydrate the tubing in preparation for the refrigerant. Refrigerant oil when mixed with water creates alcohol and acids, thanks!
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Is it ok to use Argon to do a pressure test? I already have a full tank for my MIG welder and I rarely use it.
Yes any dry inert gas can be used, thanks!
@@acservicetechchannel thank you!!!!
We use valve core tools but I do not see any hooked up to yours??? Explain I was told if you take out valve core without a shut off valve core tool refrigerant goes everywhere? I'm about 2 months into field training
This was just a pressure test on an empty system I was installing. We pressure test for leaks with nitrogen, thanks and keep watching and asking questions! Thanks!
If AC is working fine, is it important to get the pressure checked regularly?
No, only if you suspect a leak due to lack of cooling or heating
Everybody has there own way of pressure testing the system. After the pressure stabilizes I release the nitrogen and keep about 3 to 5 lbs inside the system, then hook up my vacuum pump and start this process. I was taught this keeps moisture from being introduced back into the system. You don't do this, in your opinion does this matter? and why? Thanks in advance.
If the pressure is released to atmospheric then it won't suck new humid air into the tube. We don't usually leave them open for more than a couple minutes anyway. You also don't want to add accidental positive pressure into your micron gauge. It won't really hurt in reference to having the 5 psi if your micron gauge is valved off. When texts talk about not introducing moisture into the system, they are speaking about taking a partial vacuum and accidentally breaking a recovery or vacuum with air but once you are at 0psig I really fell it is negligible, thanks Master and Warren!
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could you accomplish the same thing with a vacuum pump?
Vacuum gauge will verify if there are no leaks as well as by holding a vacuum test but we pressurize first to check usually. The combination is highly effective, thanks
Vacuum takes a lot longer and if any non condensable exist it will give a false reading. Pressure is good to find leaks or bad braze joints etc. nitrogen also helps to remove contamination.
Yes and thanks Matt!
why not purge your hoses before opening?
How can you tell if a system has only nitrogen in it? Is there a way of doing this with guages?
Release some pressure, if pressure back again like before then it's refrigent if pressure goes down then it's nitrogen,
So why does a new manual still say to pressure test to 150psi
There’s times I pressure test the system and I let it wait to stabilize, but after 15-20 mins I see it drop at least 5,7 psi. There’s no obvious leak, I bubble check it and nothing. But once I put it in a vacuum it’ll hold. Do you know what could be going on? It happens more than I’d like to.
Oscarbm1234 Someone told me all the vacuum that you can put on is equal to a 15 psi pressure test.
According to him a vaccum test is not an adequate leak test.
Granted a vacuum test would find bad leaks but not a slow seasonal leak.
Oscar, nitrogen changes pressure due to temp so if you take the tank out a hot truck and then put it in a system that is slightly cooler then the pressure will fall a bit. Nitrogen will change in pressure according to temp but not nearly as much as air or refrigerant. A vacuum test will tell if there is a leak , thanks
Hey Blade, They were talking 0 psig equals 14.7 psia so if you bring a vacuum down below 500 microns then you would be in negative pressure but in terms of a vacuum, we are talking a very deep level. This is why we do both, a pressure test and vacuum test to be sure. The thing is that we are able to see the micron movement at a much smaller incremental amount so it is easier to tell if there is a leak compared to watching a compound gauge or even a digital gauge, thanks
acservicetech So a vacuum will find even the smallest of leaks?
A vacuum will find a very small leak but once again, I am advocating that both pressure testing and vacuum test procedures both be used to make sure, thanks
how much liquid nitrogen do you need to have on hand to pressure test a system.
Good question, i see no-one has answered it 🤔
I don't believe it's LN, just pressurized gas.
Nitrogen is the right way to check the pressure but why most of the peoples using free-on to check the pressure and they don’t pull the vacuum too it’s sad.
Spread that knowledge...Some aspiring HVAC tech can learn the right way to do things...Also, maybe show them what it's like to work on the 4th of July in a dirty attic in florida for unappreciative home owners...:)...Glad I'm a carpenter...:)
godbluffvdgg were you in HVAC trade before?
Nah, but I've done it, and been in the trades as a Remodeling Business owner for 3 decades up in the philly area...I know lots of contractors...I've heard the war stories...:)
I come from a family of carpenters and was a carpenter doing remodeling, doors windows, additions. It is all fun stuff. Attics are the unfortunate item though but the HVACR practices and procedures are interesting as well as the diagnosis and the ability to rescue someone who is having a problem, thanks godbluffvdogg and Lwanga!
Just bear in mind that the unit does not turn on in terms of pump down
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There’s no insulation on that line set
That was during an installation where a section of insulation was added afterward, thanks!
Too much yak. Get to the point.