Air Conditioning Repair - Megaohm Meter
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- Опубликовано: 25 июн 2012
- Air condtioner repair Louisville | Home Performance Solutions | Call (502)749-4969
I show how to use a mega ohm meter to check electrical resistance on a central air conditioner..
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I use mine often much easier to show a customer than explain ohms readings. I always like to explain and show the customer why the problem exists. Nice tool I would highly recommend. Great video!
Eddie, this is a great tool to have in the ac/ heating business. I used the bigger ones made by megger to check generator winding insulation at Carrier Transicold... Great video.
Great video on the use of merger, be careful not to touch the low voltage sides of the coils or it may feed 500+ volts into the controllers boards (including thermostat) and puff smokes everything in circuit !! Never use it on low voltage side nothing is protected! Its enough to destroy every component inside boards and it takes a second! Best way is to know what to isolate and test individually (compressors & motors).
Great Video Eddie. Thank you .
Good job Eddie. I use mine all the time!!!!!
Excellent video,Excellent tool. I've been thinking about getting a mega-ohm meter.
Thumbs up!
Great vid Eddie, Thank you.
I always keep a megger and use it, had a problem with a compressor tested ok to ground with my fieldpiece meter but bad with my megger...now I always meg it first.
Kevin
Thanks Eddie for the video. Now really understand it better. I'm going to pick one up.
A excellent video very educational ,and iformative thanks for the information .
Thanks Eddie for the video, been watching a lot of your, talyn875, and fritz's videos, starting to run basic service through my boss's shop and been picking up this m500 as well as most of what you guys showcase appreciate it and helps a young tech with solid buys on great equip. Have a nice one and you guys all rock!!!
Should I check all 3 wires on the compressor or just the L1 to the compressor thx
Good Job Eddie !!! Keep it up!!!
I have wanted one of thosew things for a while. I used my meter to trace shorts, but that looks so much easier. Great video! You are right, that will be great for PM.
While your at it grab a short pro tool as well you won’t regret it...
Hi Eddie,
Thank you for this video. You are excellent teacher.
regards,
Stephane Doyon
Great video Eddie, good tutorial of a needed instrument for hvac techs. I was looking lately closely at the Fieldpiece SMG5 . Have used them, but never owned one myself or needed to own one personally (company had them). Now I work for my wife (business owner) and must buy my own,LOL. Take care.
I can tell you that I use mine all of the time.. It is a good investment!
Good video. I enjoy the videos.
Great video
Thanks for your help that help me alot
Thank you!
I'm a better informed consumer. Thanks Eddie even though the direction is more for your fellow tradesman!!!! :)
Eddie thanks a million !!
no problem, Thanks for watching!!
Спасибо за нужное и поучительно видео!
Thanks!!
Great video Eddie keep up the good work.
That's why I believe every tech should own one and they need to know how to properly use it
Love the vid
nice video
I will try to work on it soon..
I was going to buy the Fluke 1507 but the one I have is a real good visual for the home owner. I may still buy the 1507 though.
Thanks for watching
Yes, all three compressor wires were unhooked, and the start winding showed bad. Appreciate your videos. The sytem has never been opened since it was new. Bad compressor.
Thanks for the video,can this be used to check 24v or 120v coils
I appreciate you watching our videos!!
My goal is to show everyone what tools are available that will make your job easier and more profitable.
Great Video. I have a Fluke 87 with the ability to regester 50 megohms and megged a compressor ,it showed 14 meg and 15meg on two of the compressor leads .If it showed this much with this type of meter and the compressor runs is it going bad ? I really need to get a Supco like yours .
To be sure unplug the wires from the compressor and hook one of the wires from mega ohm meter straight to the compressor terminal and the other to ground and check it that way. If you get a reading there then its time to inform the customer that they have problems.
You also need to remember that if there is any moisture in the system the mega ohm meter will also pick that up , and that can trick you into thinking that there is a short.
Where would u attach the ground to it it's unplug from the compressor? The ground side in the compressor?
Check out the one by Fieldpiece, it uses 100 volts.
Basically it's a easy to read interface for the customer to understand. I see the selling value your explaining but vs a good brick meter is it worth keeping in the trouble shooting pack? Or is it better to whip out after trouble shooting if you desire to "show and tell" with your customer?
I was also under the impression that compressor windings under 1k mega ohms warranted proactive compressor replacement. Keep in mind I mainly do commercial refrigeration. Not entirely sure what comfort cooling calls for.
The meter will also show moisture in the windings. Say you had a leak and the system was flat over the winter, your megohm reading will be low. but after you pull a vacuum to 500 microns the moisture would be removed from the windings and your meg reading will rise. (Never check windings when system is in a vacuum)
Thanks Eddie. Btw can you do one on fuses and why we need them in the disconnect as opposed to just the breaker at the panel? Why not just another breaker at disconnect. Why do slow blow fuses blow when the breaker inside didn't, etc. do fuses "go bad" over time of high amperage not quite high enough to burn them out right away? I often see blown fuses and I take an amp draw and it's well below the rating and the condenser is clean.thanks
Have you seen a bad compressor that where the 2 line leads to the windings showed OK, but the start wire showed a short to ground? I disconnected all 3 wires and found this condition. Compressor was reaching LRA but would not start. Both capacitors were bad, One disconnect fuse was bad. Then I used the megohmeter and found the start winding showing bad and the 2 line wires showed good. The terminals on the compressor were not burnt or broken, but actually look very good.
Eddie, how come you only tested the Common black wire for the compressor instead of all 3? Just by testing the common connection to compressor would that be good enough if megging it out?
I love my Supco megger but find it more useful for finding wire problems in conduit. I like the precision readings from my $500 Fluke megger. According to the electrician talk sites I have read, acceptable readings are as low as 1Mohm/ 1,000 volts rated line to line voltage plus 1 Megaohm for safety margin. Example, 240volts = .24 Mohm + 1 Mohm = 1.25 Megaohm reading line to ground.
This has proved to be true on 480 volt systems, in my experience, as I have yet to find a circuit tripping overloads or breakers with less than 1 Megaohm reading line to ground unless it was a bad breaker/ overload/ overload setting. I have not tried it on scroll compressors yet but they are just another electric motor so don't see why it would be different
Meant to say "with more than 1 Megaohm line to ground"
If I had a reading from 30 to 100 Megs, I'd change the drier and let the system run for a month then recheck the winding reading. In many cases the reading will rise back to the good range. If it stays low , then it shows you have damaged winding insulation.
Any danger in using the Supco 500 on a residential unit that only runs off if 208 volts.
Hi thanks for your videos . Have you seen this paint brush looking coil cleaners. Do you know where to pick one up. buy the way mega meter is great
look like the real deal and great vid, my question on the fan motor capacitor does it need to have a hot line on one side I have two brown wires one brown with white stripe but I forgot if one of the black wire is connected too? and which side ?
Luba Luba when in doubt just look at your wiring schematic located inside the outdoor units panel. “Herm” is compressor, “fan” is fan, and “C” is common. Don’t get caught up in memorizing colors. Different companies use different colors for different things so don’t rely on colors.
seems like we need a class is Reading a Multimeter... Just Saying. Nice video for the Newbies...
Y am asking this question is ur meter shows 20 mega ohms bad .but other compressor companies they recommend 1mega ohms enough .
Trust me I know all about this, that's the main reason I made this video using the supco. People need to learn the proper way of using it.
I'm sure that I have a lot of people that wished I never put out videos like this but there are way more eager people wanting to learn the right way.
Have you ever gotten a bad reading on the meter and compressor still run? I had a tripped breaker then checked all 3 terminals on the compressor and got bad readings from all 3. But tried it and the compressor still ran pulling 10 amps.
Sounds to me like the meter did what it was supposed to an found the cause of an intermittent condition.
6:33 That's all it really is.
Eddie thanks for the video. Would you still purchase the supco 500, I have read conflicting reviews on that product.
I like the supco for the showing the homeowner that there is a short, it's easier for them the understand. I was looking into the one that Fieldpiece makes and I may order one. It's the smg5 and can be had for under $100.00
Ty
You rock!
Moisture will be picked up with a megger, make sure to moisture test before you say a compressor is bad
How do you do a moisture test
Dear sir iam also ac technician . What is the minimum recommend resistance value .
Just tell the Boss that you need the proper tools to do your job and that she needs to buy one for you!!
Let me know how that goes. lol
I have a meter and now know what to do with it, lol.
Just Do It!! lol
LOL!
Supco makes garbage tools!
you don't need a tool to do this this is basic trouble shooting
This is a great visual aid for the homeowner to show them that they have a problem. they will trust you more when they understand what they are seeing and this tool helps
I disagree nice tool to have in the bag but as a tech not really needed its Greek to the home owner
first of all your a good tech and I know your trying to help those starting out all good
guess what beer can cold is not ok anymore lol
MrAever I have used this tool with many homeowners and as long as your not talking super tech with them they always understand what a short is and this tool is the simplest tool to convince them. I have closed countless repairs and replacements with this method.
Thanks!