Air Conditioning Repair - How to ohm a compressor
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- Опубликовано: 2 окт 2024
- Air condtioner repair Louisville | Home Performance Solutions | Call (502)749-4969
I show how to check windings and look for a short to ground
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Thank you for sharing your video tutorials. Watching with full support from Canada 🇨🇦.
Eddie, been watching your videos and they are much appreciated. You and a couple of other guys on YT are doing a great service to us new-bees getting into the field. Im sure I speak for many that your intentions are well received and very admirable. Thanks again!
You must also ohm each terminal to the compressor case (ground). Scratch off the paint to get a good ground connection. If any internal motor winding is shorted inside to case you will see this short. It will read less than the other readings if shorted. If good it will read open on all terminals to case ground. Also circuit breaker in house will pop every time ac comes on. Unhook compressor wires turn on ac and if breaker does not trip guaranteed shorted out compressor.............
Thanks for sharing your videos about the troubleshooting of the air conditioning. Greetings from one of your subscribers from Canada
Very thorough instructions.
Another great video!
Great video Eddie as usual. Want to add one thing safety wise for new techs. Whenever you are testing compressor terminals at the compressor, never get in front of it, always remain to the side. It can/will cause severe injury IF a terminal blows out under pressure. That can/does happen when touching them to test if old and/or loose, etc. Fritz is coming over, what are y'all cooking, LOL ? Take care, Brett
Was the compressor contactor bypassed at the start of the video? Looks like the load wires were pulled off the line side. Great video!
He can measure airflow and try to get it around 350 cfm per ton but you are not going to get it much lower airflow than that before you start running into trouble.
Good Luck!!
Use a 500 VDC Mega ohmmeter from a grounded screw
(don't scratch the paint off!) to the Run or start lead. Should be a half a meg of resistance to ground
Like the marked "GRD" connector on the right?
Thank you, very well done.
Great vid!!! VERY informative and well done.
Awesome.. thank you for posting this.
This help me out alot
Can you also amp the compressor out and if it pulls to much amps then it's a bad compressor?
Excellent
Just want to send a personal "Thank you," Eddie. After getting the news from a "licensed HVAC tech," then watching this video, I decided to check the winding's on the compressor myself. One wire had burnt off the connection at the compressor. I did the repair myself and turned the unit on and BAM, I have AC again !!! Instead of paying anywhere from $1000.00 to $3000.00 for a replacement unit, I paid $2.99 for a pack of 10each connectors (only needed one). Thank you thank you thank you !!! After a couple of days I received a phone call from the tech himself apologizing for the incorrect & nearly costly diagnosis !!
Rodney Richard
Opening disclaimer says this is only for licensed and trained HVAC techs only? Are there licensed and trained HVAC Techs that don't know how to ohm a compressor?
Lol.
And what is a neutral wire? I'm not trolling, I'm getting in the field and I wanna know as much as possible before I start class.
Thanks!! I am working on it..
I have a Guardian ac unit single phase. I get 3.1, 2.0, and 4.5 is that a bad compressor?
Thanks Eddie, the first video that concretely tells you how to identify start, run and common, by going directly to the horses mouth.
Good demo
Thanks Great Video. I like be thorough & this another thing learned. Always room to learned. +++1
Bro just take the wires off the compressor, take your meter put it to continuity, and go from each lead to ground . If it rings out to ground on any lead , u have a shorted compressor .
Oversized equipment is also a problem because it cools so fast. Your air conditioner needs to run really long cycles to remove humidity. Ideally if its 90 degrees or higher outside it should run pretty much non stop all day.
Very helpful step by step hvac educational video thanks alot keep them coming...
good video man, I've been working HVAC a long time your video is just simple but all you need to know here.
I'm truly excited that you enjoy watching the video!! I really enjoy making them to keep myself up to date and for everyone of you on RUclips!!
Yes a dvd would be cool
Great job explaining how to check the AC compressor for open winding and shorts.
I was able determined that my compressor was not damaged My local AC guy was impressed that I even had a voltmeter..lol
Gave me a full tutorial on how to troubleshoot the 24 volt system... It was more complicated that I could handle.. The dual capacitor had failed and the fan wasn't running, but the compressor was, thanks to the hard start capacitor.... Lack of fan cooling lead to the hi pressure trip and the reset switch was broken... So the pressure switch was done as well.
Took him over an hour to go thru everything and replace the capacitor.. Working like new now.
I think your tutorial impressed him enough to give me a very good price for the repair.
I wouldn’t just assume that the test lead in your left hand was in good contact with ground. It would be better to ensure your test lead is well grounded by first grounding both test leads at separate points on the machine and confirming good continuity, then test your compressor windings.
Or how about using the actual "GRD" connector on the right side...maybe leave the factory paint intact?
@@henseleric The ground screw is a good choice. You just have to make sure that your meter lead is in contact with ground. The paint or even other films on a metal surface can be insulators and can interrupt the flow of current necessary for your meter to detect an open circuit. Whenever you are checking for the absence of something, weather it is continuity or a voltage, you must be sure of your connections. It’s like checking for no voltage on an electrical conductor before you touch it. You better be sure your meter is working and in in contact with the surface you are checking.
Excellent video. Learn something new all the time and in our line of work its very helpful. Thumbs up.
make sure that the unit is clean and don't assume that it is just because the exterior is. The coils are around two inches thick and a lot of dirt can be in between the fins. also make sure all of the connections on the compressor are tight.
After you make sure everytthing is ok then you can go by amp draw.
Hey Eddie !!!
Great Job Brother !!!
Once the Light goes off , and a Tech realizes that Common to Run = Lowest Resistance
Common to Start = Medium Resistance and Start to Run = Highest Resistance the World is your Oyster !!!
Got a Trojan Horse on Headquarters Computer !!! (SUK) ...
I'll come out and see ya tomorrow , when we get Her under Control !!!
I had a call at a golf course on the beer keg walk in cooler,it was in a golf cart metal building.The condensing unit was on top of the cooler.I got in front of the compressor took off the plastic cover and turned the power on, there was a short across the terminals inside the red fusite plastic, it melted a hole in the fusite plastic, the electricity continued to arch while the refrigerant charge discharged through the hole, directly into my face.It was like being inside a comet.
I don’t care who you are,...that right there was funny. Not for you, but your telling of this experience was great! You should write comedy. Lol
Straightforward way for new techs to be able to ohms a compressor. Good video.
Love this vid, it's hard to find a good reliable and straight out educational video on RUclips and you gave some what if options to do if your not sure or can't find out were the wires go, This is a great vid thanks.
any hvac tech knows where the wires go regardless if you look at them or not, the thinnest gauge wire from the compressor is always usually red, and that goes to Herm on the capacitor, the common will go to T2 on the contactor and the run (usually yellow) is T1 on the contactor. noting that different manufacturers can swap T1 and T2 depending on the wiring of the line to load. but black will always follow black, and colors are always colors on the contactor. Caps have 2/3/4 poles, 4 is always common, 3 is always herm, 2 is always fan.
Before I watched this all the way through, I was gonna have some tech questions, but I was patient and watched and you did an awesome job.. Nice job on the ohm value and I was really glad to see you pulled the cat head and checked the compressor terminals.. A lot of techs don't lol
Great info. Thank you. I do have a quick question though after testing mine: This heat pump's compressor reads as follows (at the unit itself): C+R = 1.0. C+S = 1.2 R+S= ONLY 1.4 when it seems that it should add up to 2.2 based your example. Does this mean I have a potential problem with my compressor?
its basically the same as a ground meaning its the return path of the hot wire that ends up being absorbed by the earth from the utility pole
you can also say that power is sent out (black wire) to power a motor or other part then it is returned back to the source (white wire,neutral) and then sent into the earth
i hope that makes a little sense..
Somehow it does not... but good video. Also the introduction is hilarious!
Totally Ass Awesome, Thank You so much for passing on this kind of valuable information, I'm a Master Electrician and you did it beautifully. Great Video,
Good video
Question : I have a one and a half ton 220volts split unit AC. After few seconds of turning it on the clamp meter reads 22A then rise to reach 37A for few seconds then it stops and the clamp meter reads zero or 0.1A What could be the problem?
Great post! Thanks for this wonderful video! Our technicians are professionally trained and licensed. You can place your trust on us. Make an appointment with us now. For more info visit us at www.southperthairconditioning.com/
SIMPLE, LUCID, INFORMATIVE, NO-NONSENSE VIDEO, Kudos brother, that,s the way an instruction video should be, Thanks and keep it up.
Does the decrease in the resistance value between the common terminal and the start terminal imply that the compressor is malfunctioning?
Example, the resistance between the common & start is 1 while the resistance between the common & the run is 1.3 (resistance total between run & start is 2.3).
Noting that the compressor needs a start capacitor to make it running. Without that start capacitor, the compressor cannot work.
So, two questions are here:
1. Do these resistance values indicate an issue with the compressor?
2. Does this need of start capacitor to start the compressor indicate that there is an issue with the compressor?
Thanks
Ok. The question I can not get a answer on is what is the range of ohms that is considered normal? I understand testing Run and start and it all added up to 3, I got that part but what if it added up to 1.2 OHMs? Could it be .8 ohms? Could it go higher than 5? Is there a point the ohms are too high or too low? Or it dosent matter as long as C to R and C to S add up and equal close to R to S? What if I get .3 on one leg and 4.9 on the other? How high or low can these ohms go before condemning the compressor?
Great explanation , thank you Ed
Really nice video. Question: if you want to check the total inrush at start-up. Do you recommend putting the clamp meter on the common wire from the compressor or the run wire coming from the compressor? Thank you.
so what if the "run" + "start" does not quite equal the total of "com +Run" and "com + start?" No mention of what this means. toss the compressor? or if it's only off by .5 - it's okay? Still good? is there room for it being off by .5? No mention in your video of what to do. None of the other videos will say either.
thx for vid!
Thanks for the video just had this in my motor controls class tonight. I am training to become a hvac tech. You and Fritz have really been helping me out a ton with the videos!
good video thanks
Thanks!!
Good luck with that computer!
Toilet paper? At least he could have used a dollar bill like most tech that I know. lol
I am sorry but I personally don't know anyone in your area. I would have to recommend that you try hvac-talk dotcom. Tell them that you want airflow verified with a anemometer and a static pressure test performed.
Hopefully someone there will be able to point you in the right direction.
Good luck and let me know how it goes..
Eddie, great video been in the field for a short time now but sometimes I have to research certain trouble shooting procedures because if I don't perform them I tend to forget. thanks and keep posting !!!
only for professionals? you got to be kidding me, professionals won't even seat down to watch your vids, this is for us the un-experienced with the guts to try it.
don't watch his videos if you don't appreciate them, this is a great resource for younger guys in the trade and should not be undermined.
I never meant to say undermined, I do appreciate your vids and big time take advantage of them, so just chill out, you are cool.
bullshit...newer guys need this.Take your time getting home,I'm not through with your fat wife...lol
by the way, these are the numbers that I got: from R-C: 1.3; from C-S: 0.7; from S-R: 1.9. Did not add up the 2 from S-R. Also, when tested the wires to the casing, all three wires beeped. disconnected the wires; rested and the same thing. can you explain why i did get some numbers but it beepd when tested to the casing?
He he. I mean...besides a leaking evaporator.....What did you replace it with? You guys are Carrier right? I am really enjoying your instrument videos. Keep it up!
I will message you soon. If you dont mind I would like to speak with you personally via phone. I would really enjoy talking shop with you.
If a compressor C-S =2.0; C-R= 1.7; S-R= only 2.9, these windings still good? No short from any terminal to shell (scratched off the shell paint). Amp draw was zero on "C" and 3A on "R" , that could indicate virtually all the R-22 leaked out? The lower the load on compressor, the lower the amp draw? Didn't have guages.
I can't believe that I missed these comments!! Sorry for the delayed response!
Thanks for watching and never stop learning this stuff...
I'm working on replacing a 4 ton scroll compressor on a Rudd rooftop unit. I installed the new compr. in pulled a good Vacumm and use about one lb of R-22 I turned the system on compressor came on but it was too noisy I was charging it with gas refrigerant but after a good 7 minutes compressor turned off. Top of the compressor was too hot and it wouldn't come back on so replaced with another new compressor and it did the very same thing. That unit has an accumulator. Im wondering if I made a mistake by not adding enough refrigerant before the start up. I was afraid that liquid would get inside compressor. I need help plz. Thx
You are spot on the safety part of this repair.. never have any body part in front of the compressor when checking them out.. Thanks for pointing that out..
we didn't cook anything this time lol..
I have re-watched this video a few times and you say if you hook up your leads between S and R and it beeps and then you go from run to common and run to start( which is the same as S to R) and no beep...that means it is out on overload. That makes no sense to me!
It may just be semantics but there is one detail that may need clarification. You state that it takes more electricity(current) for the start winding. The start winding has a higher resistance than the run winding even though the start winding is physically smaller(smaller diameter wire). Ohm's law applies......A higher resistance means that it takes less current compared to the run winding which has the lower resistance. Not to be confused with overall "start-up" current which is higher than "running" current which is true for most any motor as it requires more current to overcome the force of the inertial mass when it's not moving. If I recall correctly the start winding provides a phase shift to get the motor moving. At least that's my understanding. Please correct me if I'm wrong.
great video! tested my compressor and is bad. would it be better to buy a new compressor or just buy another hvac sytem?
You MUST always check at the compressor incase a wire is rubbed out or broken inside. You MUST check each compressor wire end to end to make certain a wire is not open. Why guess? Just take a second and take note or take a photo.
Awesome great detail keep up the good work
Great video! Great tool for new techs! So what happened to the old Goodman?
how about the 3 phase compressor? how can identify the common,,run,,,and start?because last time i check the compressor motor those all connection are same reading? L1,L2,L3 all are same value?
Since they all read the same, the compressor windings are probably good. Sequence doesn't matter on a 3 phase compressor. BUT, if you are working on a 3 phase 240/120 system it will have a "wild leg" that will have a higher potential to ground than the other 2 phases. About 277 volts depending on how well balanced the building electrical system is. It shouldn't matter in refrigeration equipment but can cause serious problems if it is mistaken for one of the other phases. It should be marked orange.
I need to explain my comment "can cause serious problems if it is mistaken for one of the other phases". I meant in regards to other wiring in the building or structure. In a common 3 phase refrigeration system it is treated like the other 2 phases. The only time that it could mater is in some strange control wiring setup that doesn't have a 240/208 volt primary control transformer.
Man wish you love here in iowa to fix my ac unit on my mobile home..i call a person that works on cooling and heating units they told me that the compressor went bad and to replace a new one or used so I'm looking about grand or some any sugestions please.
Come on now its a goodman! lol, jk..
customer added a 800 sqft addition and only wanted one system so we upsized the equipment.
Is a Goodman a piece of crap? I hope not; I just bought a new one.
Nice work done just keep showing us the best of all thank you,buh pls sometime checking the compressor dot really show
hello eddie quit question .. I have a compressor it runs good but after 45 mns it tripp the breaker off
great video, but you mentioned that the middle and the lowest value should equal the highest value. my question is what if they don't?
Thank you 🙏
What ever it takes to get the job done correctly.
Thanks for watching!!
My classroom portable air conditioner have a major problem. Portable Air unit Is on, but the few minutes later the air conditioner have very lond sound and is shaking too dramatic for few secords until the cold air is off for 10 minites later, the cold is on again then later the air unit same problem again. Did you know whats happen going on the classroom portable air conditioner problem is?
With alots of time per few minutes for same problem.
Amazing info but dude! Get a new fucking meter! That beep is extremely annoying when checking ohms.
luis Martinez : Really? That beeping noise bothered you? It didn't bother me at all and it didnt seem to bother Eddie either.
I must admit, once the video finished and I came away just that much more knowledgeable for the experience, I thought to myself that I wished my cheap Harbor Freight multi-meter would beep like that.
You sound kind of high strung. May I suggest decaf from now on? Or maybe lay off the meth? Or maybe turn the volume down just a bit? Or ?
middleclassic lmao! You're ridiculous for a grandpa. Just cuz you do meth doesn't everyone does. Tone it done a bit. You may get a heart attack typing so upset. The noise didn't bother cuz you couldn't hear with your deaf looking ass.
3phas 220 ti1t2 t3 line
Greetings from Milwaukee Wisconsin, thanks, very good explanation
How to ohm a compressor
No problem and thank you for watching!!
Great video clip
Very interesting . Thank You for sharing
Like it
No problem
Thanks for watching!!
Good explanation...
ॐ true nature
That' Scary!! Be careful out there!!
Looks like you started a bunch of homeowners working on their own equipment! Somebody's going to shock the crap out of themselves on a capacitor! Lol! Good video though
Yeah , good catch, he forgot to say how to discharge the cap,, i guess theyll get discharged when some one grabs one thats loaded up,, i aint tellin,, i guess im just evil , but all should feel free to post before and after pics after you grab a charged one,,
its the neutral wire on a 110v system.
Yes it was replaced with a carrier..
Message me anytime!!
lol I know what you mean!!
Good call!! This must have a high end Goodman they actually marked its termsnal's!! Hehe :)
My pleasure..
Very nice video with lot of information , thanks
cool video for learning how to check compressors!
Great video...very helpful for the DIYer
excellent instruction
Thank You for watching!!
Eddie, this is a very helpful tutorial video, thank you for posting it!