-Join our updates list for an email strictly from us for new videos, articles, products and website features! www.acservicetech.com Mini Split Book on Our Website- www.acservicetech.com/mini-split-book Mini Split Book on Amazon- amzn.to/3ytHJSs Mini Split Book on TruTech Tools- www.trutechtools.com/BooksGuides Mini Split E-Book on Google- play.google.com/store/books/details?id=HN-iEAAAQBAJ Mini Split E-Book on Apple- books.apple.com/us/book/id6445178399
Hi Craig! Love your videos! AMANA furnace with a B1 code (module not communicating with blower motor) emerson aa25650l variable speed. Meter reading from R-W is 0.04V at the control board and the rest of Tstat wires are 27V. Do you know what could be the problem? Thanks very much!
Hi I just had A unit where we put all new wiring box / outlet then change the capacitor but end up with no running fan after ordering a motor fan condencer got it changed the fan started working but the house isn't sending a cool air in the house ?? So I'm afraid there's a problem with a bad compressor or just cuz of the hot weather that I need to hose it down with water then cool it off then try it works? I wish I could get some guidance from anyone here that faces similar problems? Thank you
Great video!! Suggestions and beyond ; 1. If the IOL is stuck open and it shouldn't be (Cold compressor etc), try hitting it with a 2x4 to unstick it temporarily until the repair/replacement can me made. Sometimes a sudden shock will get it to close. Sounds unprofessional, but if you get it going for the weekend, you're a hero! 2. After turning off the power to the outdoor unit, push the contactor fully in- to make sure the power is off and to bleed the capacitors at the same time so you don't get bit. Check as well with the meter to make sure power is off. 3. If nothing is running outside and it should be, don't be fooled. A bad duel capacitor can cause the compressor and the motor both to overheat and shut down. 4. Plastic forceps come in handy for quick connecting a temp wire or meter to another wire or capacitor for testing. 5. Always test a grounded compressor at the compressor itself, the wiring to the compressor may be shorted to ground (Made that mistake one cold day covered in snow- but only once) lol 6. A float drain switch in the main drain can flicker the low voltage on and off quickly causing chatter at the outdoor contactor and also cause the scroll compressor to run backwards resulting in a no cooling situation and a noisy compressor complaint. Install a time delay relay in the circuit and set it for one minute minimum. 7. Always verify your meter is working by testing it on live voltage first! Assuming the power is off because you don't read voltage just might mean your meter just quit working. I've enjoyed HVAC work for over 48 years and I still love it!
Hands down the best teacher and UA-cam channel on here. For someone who likes troubleshooting and fixing their own equipment these videos are incredible.
If you get OL between any terminals, common to run, run to start, start to common, you’ll get OL on your meter. That’s means the winding is open. It’s possible to just have one of the 3 open, 2 of 3 open or all 3 open. If the compressor is severely overheated the windings will be open until the internal overload resets. You can cool the compressor off with cold water or ice. A lot of times you’ll hear the internal overload reset, it’s a mechanical “click” noise. If you check any terminal to ground (any terminal to copper ref line works best) you’ll get continuity or a “beep.” If you get a beep on any that compressor is dead. On a 3 phase compressor all resistance (ohms) from terminal to terminal are EQUAL. On a single phase compressor common to run and common to start=start to run….run to start is the LARGEST RESISTANCE VALUE, common to run is the LOWEST RESISTANCE VALUE.
Hi Craig my situation is same like you mentioned Compressor, , Start - to run 2.9k ohm, and common - to start =OL, and common - to run = OL OPEN, And I haven't turn on ac for days even crazy hot weather too, is there anyway I can fix it??? And I also check , common - to ground green =OL, Run - to ground 39k ohm + and meter ohm keep on increasing, and Start - to ground 39k ohm+ meter keep increasing???is there way to fix or I have to replace a 5 months brandnew compressor?? Thank you for your help and your time
The contact is pulled in, but the compressor nor fan start. Got readings for compressor wires and terminals, but one wire from condenser fan had no reading. Will dead fan motor prohibit compressor from starting? 1996 Goodman 3 phase condenser unit.
I've been messing with a Honda generator and it's gen Head. I kinda, sorta see some similarities between the two. Then again the extent of my voltage meter experience is the continuity setting on my volt meter. Great channel by the way.
Not all failures are burnouts. There are 3 types of Compressor failures opens, shorts and burn outs. A standard VOM may not find a high impedance short to ground a merger maybe required. I’m a HVAC&R service tech with 40+ years of experience.
Generally shorts to ground are not a burnouts or have significant amounts of acid in the system. A burnout will generate acid from insignificant to severe and often create sludge if any doubt use an acid test kit. At a minimum a high capacity liquid line dryer should be installed when changing a compressor and the refrigerant should always be changed.
Smelling the refrigerant works too. Spraying just a little of bit of refrigerant in your hand and if its smell like burnout tells you that you have a burnout compressor as well. That's just another easy way to identify a burnout compressor.
The oil will also be black. Or darkened. It does have a terrible smell when it burns out or I have seen a ton of foam which indicates liquid migrating to the compressor oil and sludging it
So basically if the compressor is off on overload it would read OL between windings? And if it’s shorted to ground you would get continuity(tone) from the shorted winding to ground ?
That means we are looking a variations in current related to different resistance, or the resistance and current are inversely proportional. As the resistance goes down the current goes up !
Hi guys, im a service technician in Botswana and love the great work y'all are doing with the videos! Coincidentally i had a similar problem just the other day with a Maclaren 12000 btu packaged unit! The compressor was heating up and much like in the video the thermal overload kept it from starting! I did an ohm test, continuity test and ground test to the compressor and everything checked out! I also tested the capacitor and also did a visual test and still everything seemed legit! I then took the decision to remove the thermal overload to see whether the compressor would start (big mistake) long story short the compressor overheated and shutdown! Can you help on what could have been the problem and what could i have done different
If you get acid smell from refrigerant, it's a bad burnout. Put ammeter around all 3 compressor wires. If meter moves at startup, compressor is grounded.
@@acservicetechchannel Good day Sir First of all sorry to how can i speak English but i hope you understand... What are the possible problems to compress Air dryer with alarm overload and everytime i turn on the breaker it always tripping (3 phase)
While the system was running, my guages were reading equal pressures on both high and low sides. I checked the capacitor, and it was good. Disconnected all three wires to the compressor, I was reading 1.3 ohms between the 2 terminals and OL between the other 2 terminals. My guess compressor is bad.
I have a Copeland that is 23 years old. Just have R22 with 30psi on the low side. I charged it up to 60 psi a few weeks ago. My current problem. No leaks found yet...
Also your vacuum videos really saves me a lot of time. I use your 3 core tool removal tool method with 2 hoses, I pull a vacuum in 5 minutes or less with valves open! My company wants me to train everyone on how to do it, I did give you credit. I wish more guys would spend time mastering their trade away from work.
Is it a failed compressor if the compressor is pulling double LRA even after installing a hard start kit but the windings have continuity? Compressor isn’t tripping the circuit breaker either
Yes that would be a failed compressor if it is mechanically locked up like that. Sometimes you can give it a bump and it will free up but that's a stop gap solution
When it comes to identifying the compressor winding, I usually teach the winding opposite the highest resistance is the common winding. The second highest resistance is start and the lowest resistance is run winding. The major question is, why is the start resistance greater that the run resistance?
During startup the condenser makes a loud thumping noise, does it mean the compressor is bad? It’s a new build. The technician came out twice and said the compressor is not bad. I don’t believe it. My neighbor isn’t having the same issue.
I'm a 63 year old female and yes we still get Cheated. A service guy checked my wire outside said compressor was leaking in my house but never went inside, anyway wanted, $2,600 to fix it. I have no son or husband so any small info the better for me. Thank you
Hello Craig, which of your books would be best to learn the fundamentals of hvac split and troubleshooting methods? Am trying to save costs by DIY as much as I possibly can. Thanks.
My technician came today and put the clamp on the black wire while the system was running. He said the compressor was bad based on that reading alone. What should be the voltage when connecting a compressor to the black common line while running? Can you really tell if a compressor is bad by just clamping the black wire?
How do you know when the compressor all 3 has to be the same value and when the 2 has to match the 3 value C-S= 3 C-R= 3 S-R= 3 Thanks AND C-S= 3 C-R= 2 S-R= 5
Great video. What is it that is causing the ac breaker trip frequently? Checked all the electrical of the condenser unit and all seems to be good. The capacitor is new the fan motor has no issues the contactor looks good. Could it be the compressor causing it? If so how to diagnose and fix? Thanks.
Check the circuit breaker itself...Make sure that ac breaker it not warming up or hot when you start/running the compressor, check the temp of the circuit breaker-using HVAC infrared thermometer...Also, With your HVAC clamp on ammeter, check the Starting Load Current SLA and Running Load Current RLA...
@@thembones12 Thanks for the reply. Just for your information, it was the compressor. It was overloaded with Freon. Overcharged with the Freon. Recovery of the freon did the trick. The breaker has not tripped since then. Thanks.
I had a compressor blowing the breaker. I check resistance from C to R and got OL, C to Start was 47, start to R was also 47. But it wasn't grounded. The compressor wouldn't start tho. So I changed it. Did I do the right thing or did I miss diagnose something?
I do enjoy your videos, great job there, but I do I have a question. I have a heatpump ( portable ac) and it is kinda noicy and I did some research on that and I learnt about using something called ac compressor blanket which wraps the compressor completely to insolate the noise it produces, can I use that on my portable ac compressor? If yes can I make a homemade cushion ac blanket and use that instead? What is your advice, please let me know. Thanks👍
apparently i have a hydronic ac unit and two HVAC guys didn't even want to fix it. they didn't even want to check nor even try to diagnose it. the fan run outside and so my unit fan inside the house and the only think it does is cool and then suddenly warm air through out the day and I would feel cool few times but never how it used to. so two hvac guys did not even bother trying to even check it.
Great video...thanks. This is what I have, does it indicate a bad relay? Whirlpool WRT111SFDW03. 7 years old. 11.2 cu ft size. Freezer on top. Start relay P/N: WPW10448874, aka W10448874. Capacitor ("cap") P/N: WPW10662129 Test relay connections with capacitor on the relay. Results: when together I can get cap to charge and discharge thru the start relay, just like it does when it's off the relay. With cap off and on, neither of the lower holes have continuity with each other. The hole on lower left has 0.0 ohms resistance thru the bottom blade of the back of the plug. The lower right hole has no continuity with anything but can be used to charge the capacitor for testing. The upper hole has 0.1 ohm resistance to the top blade on the opposite side. Remove relay cover and visually check. I cannot get combination relay apart without breaking it, so I haven't committed to that, yet. Ohm test the fridge compressor pins again. Make sure the Common (top) and lower pins are within 3 ohms. And the two pins at bottom should read about the sum of the Common with the Start and Run pins. See UA-cam video... Results: Top and Lower Right : 4.4 ohm. Top to Lower Left: 6.0 ohm. Two bottom pins: 10.4 ohm. None of the pins are shorted to ground. My problem is it suddenly stopped cooling without noises or warning, but I caught it from hearing loud buzzing noise from compressor and relay area, and compressor was very hot. No smoke or smells though, and wires did not seem to be hot. Do you think it's the combination relay? Many thankz!
So we had a power outage and then suddenly the ac breaker tripped. Now it trips the second the ac unit kicks in. It appears to be the compressor itself, however, it measures fine and does not appear to be shorted to ground and everything measures out normal. Could it still be a bad compressor or something else? I disconnected the compressor and just let the fan run and it stays on without tripping. Kind of irritated the a/c tech came and didn't even do any measuring and just immediately insisted the compressor is bad.
You’re missing one of the possible diagnosis. It is called a turn to turn short . If the resistance readings don’t add up like in your example,something is wrong with the windings themselves. Insulation has broken down and the windings can be shorted to each other, or a individual winding can have a turn to. Turn short. Compressor windings should also be tested to ground with a megger, which is a high voltage insulation tester. It will find ground faults that your 9 volt ohmmeter can’t find.
I read ohms to ground between a compressor winding and the copper line to it and when I plugged it in it ran just fine.It was a scroll compressor.Not sure how it was possible but I almost condemned it for no reason
I have had this scinerio a few times. Compressor blowing the breaker. Testing at the compressor two windings had continuity to the tubing but not the third. The two shorted show continuity to each other but not the third. I ordered out the new compressor and someone else goes back and later tells me there was nothing wrong with the compressor. The fan would test out fine. Can an open overload create a path to ground? I did have someone tell me not to use too high of a range on the meter because it can give a false reading. I have been using just the straight continuity setting with the tone.
I had a carrier 2 stage residential compressor that threw me off. All terminals with plug removed showed continuity to ground but the terminals ohm out at .6 .8. .2. Not exact numbers but close. Normally the ohms are higher plus I never seen them add up when it is grounded. The compressor had 2 plugs which I never seen before. The other plug had only 2 terminals that I did not test. It was 2 stage obvious. Would trip breaker as soon as the unit turned on. Unplugged compressor and the fan would run. Another odd thing is it would trip as soon as I put the disconnect in without the contactor engaged
Daikin 1.5 ton inverter split ac. 5yrd old. R32 gas running pressure 150psi. Current 6.3amps Both indoor and outdoor coils have been cleaned. Service Technician says it's ok. But it's not cooling. Temp in the indoor blower showed 16'c or 60'My brand new split AC showed indoor temp at 6'c or 43'f Previously compressor would heat up and trip. So got the outdoor pcb repaired. Now it doesn't trip but keeps running. And does not cool the air. The discharge line had a bad pinch in it. It ran throughput last season. Am out of ideas any help greatly appreciated. TIA
I called technician over my fan not starting after a power outage on the community. After he came and inspected I noticed that the circuit breaker was not fully engaged and after fully place that in the right place. He can started unit and the fan start spinning. He proceed to take out the fan and got into the unit and mess with the therminal plug it slightly out and then place the fan back and started again and told me that I have to replace the whole compressor because now I have a freon leak. How can an electrical issue not causing the dan to spin, will make the the final to blow when all the pins are present and the AC Wwas not on for longer than a minute and no creo was added??
Is it possible for the compressor to test ok accross the terminals but when it's powered up goes to earth? I'm having that issue at the moment. I have OL from terminals on compressor to the housing. But when the compressor is running there is voltage in the housing causing it to trip the curcuit breaker.
Hello I have a 35 years old GE fridge I get resistance from the compressor Common to Starting reading is 2kohms, Common to running 25ohms, and starting to running more or less 2k. Is the compressor ok? My fridge is running but normally it runs loud but now my compressor runs more silent and turn off after few seconds or minutes. I test also the 3 pins of the compressor to ground it has a resistance about 10kohms. So I need to replace compressor?
I got a hp 3 ton scroll ,comp plug burnt up. replaced compressor and plug. start up pressures equalized amps at 2.0. rated for 12amps. 208 1phase. replaced IT again, start it up same thing. any ideas?
Could a guy ruin the thermal overload by getting the compressor too hot on a swap out because he didn’t use any method to help keep it cool while brazing??
My AC Breaker trips instantly when setting to cool. The outdoor unit is a Carrier 2020 model that was installed new last year. Anything ese I can try before having to call a tech? short on cash. 1. I tested the 3 compressor pins and they all show OL. 2. I disconnected the compressor to see if breaker would trip without it and breaker does not trip, Fan Spins also.(This makes me think there is not an issue with Breaker nor contactor and maybe it is an issue with the compressor or wiring.) 3. Outdoor unit is very clean, and I dont see any visual wiring issues.
Hey there, did you find the issue? My compressor does the same thing. Tests fine but trips the breaker when powered up. Not getting any replies on here. I did try disconnecting the earth lead on the compressor briefly just to see if it would run... and it runs perfectly. But it makes the housing live!
Might be a silly question, but; do 3 phase units need to be located in areas where three phase is available or do they come with a unit of capacitance and coil/s to artificially make the third phase? Thanks
your right its a silly question but thats okay. theres nothing wrong with asking a question so long as you realize that. 3 phase units are generally installed in larger commercial buildings, malls, shopping centers. They use large units that have multiple compressors and fan motors. They have special power panels that delivers 3 phase. I have actually seen a house that had a 3 phase roof top unit. Ive also seen 3 phase on a really old high rise pent house building. This guy bought 2 pent houses of the country club in las vegas and joined them together. hes got like 6 10 ton 3 phase Trane units. 2 many splits and im not sure what else. He bought it as is and i went up there. he had like 3 bad compressors, a bad control board, and ... a leak on one of the mini splits where it goes into the evap. Tons of problems. but that guy bought all that for hardly anything its probably worth a F load now.
@@barbarafogle3541 good point. but it wasnt. lol. it was one of those crazy calls lol. ive seen so many even worse than this i did over 50k service calls. i had one where the fuse in the attic kept blowing. no joke an old dead dried up spider had on hand on the 24 and another on the 120 on the contactor in the condenser. i removed the spider and no more fuses blown. that sounds impossible but i swear to u its no lie. you see all kinds of crazy unbelievable crap
@@hvacwiz7877 haha. I had that happen with rain frogs. Only they got behind the control board in a mobile home split furnace. They come down thru the old fresh air makeup. Also up through the condensate drain on pack units. I probable changes that board 4 times before I found a frog all fried.
I like talking about this stuff. Ever found the tiny tiny little spider's web in a pressure switch on a gas furnace. Never know he was in there in till you take it apart. Work one day and not the other. Check it , it reads fine. You sound like a real tech , not like most of these parts changer.
-Join our updates list for an email strictly from us for new videos, articles, products and website features! www.acservicetech.com
Mini Split Book on Our Website- www.acservicetech.com/mini-split-book
Mini Split Book on Amazon- amzn.to/3ytHJSs
Mini Split Book on TruTech Tools- www.trutechtools.com/BooksGuides
Mini Split E-Book on Google- play.google.com/store/books/details?id=HN-iEAAAQBAJ
Mini Split E-Book on Apple- books.apple.com/us/book/id6445178399
Hi Craig! Love your videos! AMANA furnace with a B1 code (module not communicating with blower motor) emerson aa25650l variable speed.
Meter reading from R-W is 0.04V at the control board and the rest of Tstat wires are 27V.
Do you know what could be the problem? Thanks very much!
The motor is working fine as per ohms test at the 3 pin connector
Do you have a video on low, medium and high temp compressor difference?
Thanks for all the amazing knowledge boss
Hi I just had A unit where we put all new wiring box / outlet then change the capacitor but end up with no running fan after ordering a motor fan condencer got it changed the fan started working but the house isn't sending a cool air in the house ?? So I'm afraid there's a problem with a bad compressor or just cuz of the hot weather that I need to hose it down with water then cool it off then try it works? I wish I could get some guidance from anyone here that faces similar problems? Thank you
Great video!!
Suggestions and beyond ;
1. If the IOL is stuck open and it shouldn't be (Cold compressor etc), try hitting it with a 2x4 to unstick it temporarily until the repair/replacement can me made. Sometimes a sudden shock will get it to close. Sounds unprofessional, but if you get it going for the weekend, you're a hero!
2. After turning off the power to the outdoor unit, push the contactor fully in- to make sure the power is off and to bleed the capacitors at the same time so you don't get bit. Check as well with the meter to make sure power is off.
3. If nothing is running outside and it should be, don't be fooled. A bad duel capacitor can cause the compressor and the motor both to overheat and shut down.
4. Plastic forceps come in handy for quick connecting a temp wire or meter to another wire or capacitor for testing.
5. Always test a grounded compressor at the compressor itself, the wiring to the compressor may be shorted to ground (Made that mistake one cold day covered in snow- but only once) lol
6. A float drain switch in the main drain can flicker the low voltage on and off quickly causing chatter at the outdoor contactor and also cause the scroll compressor to run backwards resulting in a no cooling situation and a noisy compressor complaint. Install a time delay relay in the circuit and set it for one minute minimum.
7. Always verify your meter is working by testing it on live voltage first! Assuming the power is off because you don't read voltage just might mean your meter just quit working.
I've enjoyed HVAC work for over 48 years and I still love it!
Hands down the best teacher and UA-cam channel on here. For someone who likes troubleshooting and fixing their own equipment these videos are incredible.
Great explanation...Im a minisplit tech in Apodaca Mexico...in yr videos I learn alot...
If you get OL between any terminals, common to run, run to start, start to common, you’ll get OL on your meter. That’s means the winding is open. It’s possible to just have one of the 3 open, 2 of 3 open or all 3 open. If the compressor is severely overheated the windings will be open until the internal overload resets. You can cool the compressor off with cold water or ice. A lot of times you’ll hear the internal overload reset, it’s a mechanical “click” noise. If you check any terminal to ground (any terminal to copper ref line works best) you’ll get continuity or a “beep.” If you get a beep on any that compressor is dead. On a 3 phase compressor all resistance (ohms) from terminal to terminal are EQUAL. On a single phase compressor common to run and common to start=start to run….run to start is the LARGEST RESISTANCE VALUE, common to run is the LOWEST RESISTANCE VALUE.
Hi Craig my situation is same like you mentioned Compressor, , Start - to run 2.9k ohm, and common - to start =OL, and common - to run = OL OPEN,
And I haven't turn on ac for days even crazy hot weather too, is there anyway I can fix it???
And I also check , common - to ground green =OL, Run - to ground 39k ohm + and meter ohm keep on increasing, and Start - to ground 39k ohm+ meter keep increasing???is there way to fix or I have to replace a 5 months brandnew compressor?? Thank you for your help and your time
The contact is pulled in, but the compressor nor fan start. Got readings for compressor wires and terminals, but one wire from condenser fan had no reading. Will dead fan motor prohibit compressor from starting? 1996 Goodman 3 phase condenser unit.
I've been messing with a Honda generator and it's gen Head. I kinda, sorta see some similarities between the two. Then again the extent of my voltage meter experience is the continuity setting on my volt meter. Great channel by the way.
Love the video but perhaps showing how a compressor analyzer or start kit can help diagnose a bad compressor would be informative as well.
What ohm setting do you recommend
Not all failures are burnouts. There are 3 types of Compressor failures opens, shorts and burn outs. A standard VOM may not find a high impedance short to ground a merger maybe required. I’m a HVAC&R service tech with 40+ years of experience.
Generally shorts to ground are not a burnouts or have significant amounts of acid in the system.
A burnout will generate acid from insignificant to severe and often create sludge if any doubt use an acid test kit. At a minimum a high capacity liquid line dryer should be installed when changing a compressor and the refrigerant should always be changed.
Thank you so much for your help 🙏 and it help me a lot God bless you
Yes definitely a megohmmeter is the right tool for this a vom is not capable of reading such values
Every hvac tech should have a megommeter to test for those high impedance shorts!!!
@@TheWpruden even the cheap ones, will work if it has a high voltage test mode
Excellent video, I'm not working on ac at the moment, but I still want to keep learning more and refreshing my memory
😊👍🏼
You can do it!
Thanks! 😊
Thank you for your help, I have learned a lot with your videos, I have already started my own business, I really appreciate you help. Thank you.
Smelling the refrigerant works too. Spraying just a little of bit of refrigerant in your hand and if its smell like burnout tells you that you have a burnout compressor as well. That's just another easy way to identify a burnout compressor.
The oil will also be black. Or darkened. It does have a terrible smell when it burns out or I have seen a ton of foam which indicates liquid migrating to the compressor oil and sludging it
Also the wonderful smell of phosgene gas.
This guy is simply THE BEST!
Thank you for your support!
@@acservicetechchannel No really thank you for what you do! We live in a time where training is so poor, but you have helped me tremendously!
Great video, Haiti represent
So basically if the compressor is off on overload it would read OL between windings? And if it’s shorted to ground you would get continuity(tone) from the shorted winding to ground ?
If you measure ohms between run and start but not common and run and common and start that's am internal overload that is opened
You would read continuity to ground on all windings since they are all connected
That means we are looking a variations in current related to different resistance, or the resistance and current are inversely proportional. As the resistance goes down the current goes up !
Hi guys, im a service technician in Botswana and love the great work y'all are doing with the videos! Coincidentally i had a similar problem just the other day with a Maclaren 12000 btu packaged unit! The compressor was heating up and much like in the video the thermal overload kept it from starting! I did an ohm test, continuity test and ground test to the compressor and everything checked out! I also tested the capacitor and also did a visual test and still everything seemed legit! I then took the decision to remove the thermal overload to see whether the compressor would start (big mistake) long story short the compressor overheated and shutdown! Can you help on what could have been the problem and what could i have done different
This video was very thorough.
Thank you, sir. Your videos are very helpful
They help me refresh my mind all the time.
Thx for sharing your knowledge!
If you get acid smell from refrigerant, it's a bad burnout. Put ammeter around all 3 compressor wires. If meter moves at startup, compressor is grounded.
Hi I love your videos thanks for keeping us learning God bless you Sr 🙏🏼
Thanks for watching!
@@acservicetechchannel
Good day Sir
First of all sorry to how can i speak English but i hope you understand...
What are the possible problems to compress Air dryer with alarm overload and everytime i turn on the breaker it always tripping (3 phase)
your videos and books are great! thanks, Brian
While the system was running, my guages were reading equal pressures on both high and low sides. I checked the capacitor, and it was good. Disconnected all three wires to the compressor, I was reading 1.3 ohms between the 2 terminals and OL between the other 2 terminals. My guess compressor is bad.
I have a Copeland that is 23 years old. Just have R22 with 30psi on the low side. I charged it up to 60 psi a few weeks ago. My current problem. No leaks found yet...
Great video & explanation Craig 👍
Glad you enjoyed it
awesome! Craig thank you for sharing! all your videos are so well explained! have a nice and safe weekend.
Thank you for watching!!
Thanks you sir, for delivering this information. It's usefull indeed and comprehensive. Greetings from Indonesia. 🙂👍
Great vídeo! I would love to see a video where you troubleshoot a compressor with bad or weak valves.
Easy to follow info.
Thanks.
In process of testing those in dometic harrier inverter rv airconditioner.
I have that same meter! I love the dual temp probe feature, and LRA/inrush option. Also the min/max option is cool. Great video, thanks.
Also your vacuum videos really saves me a lot of time. I use your 3 core tool removal tool method with 2 hoses, I pull a vacuum in 5 minutes or less with valves open! My company wants me to train everyone on how to do it, I did give you credit. I wish more guys would spend time mastering their trade away from work.
You guys make me want to learn the trade!
A good meter will tickle your peter
Always check at the taps!!!
Just for info, I was taught that OL on a DVOM / multi meter is “Open Loop” because an electrical circuit is essentially a loop.
OL = Open Line = Open = No Continuity = broken connections = broken loop = broken wire = OFF line = broken circuit = it's not connected, it's open....
Dt Candia - yeah, open loop.
Is it a failed compressor if the compressor is pulling double LRA even after installing a hard start kit but the windings have continuity? Compressor isn’t tripping the circuit breaker either
Yes that would be a failed compressor if it is mechanically locked up like that. Sometimes you can give it a bump and it will free up but that's a stop gap solution
When it comes to identifying the compressor winding, I usually teach the winding opposite the highest resistance is the common winding. The second highest resistance is start and the lowest resistance is run winding. The major question is, why is the start resistance greater that the run resistance?
There is no comment on my name only a run whining and start whining and they both meet at a common point which is the common connection or C terminal
Because the motor has an in-rush of current when it starts which needs more resistance (start Winding has more resistance than the Run Winding
During startup the condenser makes a loud thumping noise, does it mean the compressor is bad? It’s a new build. The technician came out twice and said the compressor is not bad. I don’t believe it. My neighbor isn’t having the same issue.
I'm a 63 year old female and yes we still get Cheated. A service guy checked my wire outside said compressor was leaking in my house but never went inside, anyway wanted, $2,600 to fix it. I have no son or husband so any small info the better for me. Thank you
Have your book and quick cards, Posters are also helpful. Recommend them to everyone in HVAC Trade.
Thanks a lot Ralph!
Hello Craig, which of your books would be best to learn the fundamentals of hvac split and troubleshooting methods? Am trying to save costs by DIY as much as I possibly can. Thanks.
Well explained I would tell any tech to have a look, good job
thank for sharing your knowledge.
My pleasure!
Excellent video, thank you for sharing
My technician came today and put the clamp on the black wire while the system was running. He said the compressor was bad based on that reading alone. What should be the voltage when connecting a compressor to the black common line while running? Can you really tell if a compressor is bad by just clamping the black wire?
How do you know when the compressor all 3 has to be the same value and when the 2 has to match the 3 value
C-S= 3
C-R= 3
S-R= 3
Thanks
AND
C-S= 3
C-R= 2
S-R= 5
Great video. What is it that is causing the ac breaker trip frequently? Checked all the electrical of the condenser unit and all seems to be good. The capacitor is new the fan motor has no issues the contactor looks good. Could it be the compressor causing it? If so how to diagnose and fix? Thanks.
Check the circuit breaker itself...Make sure that ac breaker it not warming up or hot when you start/running the compressor, check the temp of the circuit breaker-using HVAC infrared thermometer...Also, With your HVAC clamp on ammeter, check the Starting Load Current SLA and Running Load Current RLA...
@@thembones12 Thanks for the reply. Just for your information, it was the compressor. It was overloaded with Freon. Overcharged with the Freon. Recovery of the freon did the trick. The breaker has not tripped since then. Thanks.
Thanks for your videos man!
Glad you like them!
Wow thank you very much for sharing your knowledge ❤️🇬🇱
What did you set your multimeter to when checking if it is shorted to ground?
If the COMPRESSOR show normal no reading is it good or further testing is needed
On a 3 phase compressor, 2 windings reads the same. One is higher than the other. Is that term called shunted winding?
If a compressor is locked up, is it still in a bad spot and not good?
I have made a mistake by swapping the LIVE and NEUTRAL wires. Will this damage my compressor as my input and output pressures always stays the same ?
helpful and great video. thank you so much
Megger work also? OL usually means 10 mega ohms or more. Meggers go much higher...
Damn excellent video and information so thank you..
I had a compressor blowing the breaker. I check resistance from C to R and got OL, C to Start was 47, start to R was also 47. But it wasn't grounded. The compressor wouldn't start tho. So I changed it. Did I do the right thing or did I miss diagnose something?
I do enjoy your videos, great job there, but I do I have a question. I have a heatpump ( portable ac) and it is kinda noicy and I did some research on that and I learnt about using something called ac compressor blanket which wraps the compressor completely to insolate the noise it produces, can I use that on my portable ac compressor? If yes can I make a homemade cushion ac blanket and use that instead? What is your advice, please let me know. Thanks👍
apparently i have a hydronic ac unit and two HVAC guys didn't even want to fix it. they didn't even want to check nor even try to diagnose it. the fan run outside and so my unit fan inside the house and the only think it does is cool and then suddenly warm air through out the day and I would feel cool few times but never how it used to. so two hvac guys did not even bother trying to even check it.
Plz can u explain me why my cold store getting off time and again..I had change contactor also
Great informative video.
Glad you enjoyed it!
Great video. Thanks💯
Great video...thanks. This is what I have, does it indicate a bad relay?
Whirlpool WRT111SFDW03. 7 years old. 11.2 cu ft size. Freezer on top.
Start relay
P/N: WPW10448874,
aka W10448874.
Capacitor ("cap") P/N: WPW10662129
Test relay connections with capacitor on the relay.
Results: when together I can get cap to charge and discharge thru the start relay, just like it does when it's off the relay.
With cap off and on, neither of the lower holes have continuity with each other. The hole on lower left has 0.0 ohms resistance thru the bottom blade of the back of the plug.
The lower right hole has no continuity with anything but can be used to charge the capacitor for testing.
The upper hole has 0.1 ohm resistance to the top blade on the opposite side.
Remove relay cover and visually check. I cannot get combination relay apart without breaking it, so I haven't committed to that, yet.
Ohm test the fridge compressor pins again. Make sure the Common (top) and lower pins are within 3 ohms. And the two pins at bottom should read about the sum of the Common with the Start and Run pins. See UA-cam video...
Results:
Top and Lower Right : 4.4 ohm.
Top to Lower Left: 6.0 ohm.
Two bottom pins: 10.4 ohm.
None of the pins are shorted to ground.
My problem is it suddenly stopped cooling without noises or warning, but I caught it from hearing loud buzzing noise from compressor and relay area, and compressor was very hot. No smoke or smells though, and wires did not seem to be hot.
Do you think it's the combination relay? Many thankz!
Thank you, very helpful
I thought they say if a compressor fail you need to replace the whole furnace and condenser unit??🤔
So we had a power outage and then suddenly the ac breaker tripped. Now it trips the second the ac unit kicks in. It appears to be the compressor itself, however, it measures fine and does not appear to be shorted to ground and everything measures out normal. Could it still be a bad compressor or something else? I disconnected the compressor and just let the fan run and it stays on without tripping. Kind of irritated the a/c tech came and didn't even do any measuring and just immediately insisted the compressor is bad.
Is that better prove or using merger? Thanks.
You’re missing one of the possible diagnosis. It is called a turn to turn short . If the resistance readings don’t add up like in your example,something is wrong with the windings themselves. Insulation has broken down and the windings can be shorted to each other, or a individual winding can have a turn to. Turn short. Compressor windings should also be tested to ground with a megger, which is a high voltage insulation tester. It will find ground faults that your 9 volt ohmmeter can’t find.
Awesome video
Thanks for the visit
I read ohms to ground between a compressor winding and the copper line to it and when I plugged it in it ran just fine.It was a scroll compressor.Not sure how it was possible but I almost condemned it for no reason
Great info.
I have had this scinerio a few times. Compressor blowing the breaker. Testing at the compressor two windings had continuity to the tubing but not the third. The two shorted show continuity to each other but not the third. I ordered out the new compressor and someone else goes back and later tells me there was nothing wrong with the compressor. The fan would test out fine. Can an open overload create a path to ground? I did have someone tell me not to use too high of a range on the meter because it can give a false reading. I have been using just the straight continuity setting with the tone.
An open overload would not cause a path to ground. It would just prevent from the control relay coil energizing.
Continually blowing
I had a carrier 2 stage residential compressor that threw me off. All terminals with plug removed showed continuity to ground but the terminals ohm out at .6 .8. .2. Not exact numbers but close. Normally the ohms are higher plus I never seen them add up when it is grounded. The compressor had 2 plugs which I never seen before. The other plug had only 2 terminals that I did not test. It was 2 stage obvious. Would trip breaker as soon as the unit turned on. Unplugged compressor and the fan would run. Another odd thing is it would trip as soon as I put the disconnect in without the contactor engaged
Awesome tutorial
Thank you for watching!!
I'm sorry sir if u change d plorg of d compressor it will work again ba
Daikin 1.5 ton inverter split ac. 5yrd old.
R32 gas running pressure 150psi.
Current 6.3amps
Both indoor and outdoor coils have been cleaned.
Service Technician says it's ok.
But it's not cooling.
Temp in the indoor blower showed 16'c or 60'My brand new split AC showed indoor temp at 6'c or 43'f
Previously compressor would heat up and trip. So got the outdoor pcb repaired.
Now it doesn't trip but keeps running.
And does not cool the air.
The discharge line had a bad pinch in it. It ran throughput last season.
Am out of ideas any help greatly appreciated.
TIA
I called technician over my fan not starting after a power outage on the community. After he came and inspected I noticed that the circuit breaker was not fully engaged and after fully place that in the right place. He can started unit and the fan start spinning. He proceed to take out the fan and got into the unit and mess with the therminal plug it slightly out and then place the fan back and started again and told me that I have to replace the whole compressor because now I have a freon leak. How can an electrical issue not causing the dan to spin, will make the the final to blow when all the pins are present and the AC Wwas not on for longer than a minute and no creo was added??
My compressor was condemned by an AC Service company. I checked it and it's fine. Good resistance values! And OL to ground. Scum bag AC company.
You disconnected the wire from the compressor in the split unit. Is there any residual power or current in the compressor? Any precautions needed?
gotta use caution with the capacitor !!! UA-cam how to drain "entergy" from capacitor
Thank you!
Is it possible for the compressor to test ok accross the terminals but when it's powered up goes to earth? I'm having that issue at the moment.
I have OL from terminals on compressor to the housing. But when the compressor is running there is voltage in the housing causing it to trip the curcuit breaker.
Why C and R =1
C and S =1
R and S =1 ??? They suppose to be not equal resistance am I right?
Good day sir amassing tectnic
thank you for that sharing
Is it normal for my ac compressor to be wet from the thicker copper line down? It’s also taking very long to cool down my house.
Awesome thanks again
Hello I have a 35 years old GE fridge I get resistance from the compressor Common to Starting reading is 2kohms, Common to running 25ohms, and starting to running more or less 2k. Is the compressor ok?
My fridge is running but normally it runs loud but now my compressor runs more silent and turn off after few seconds or minutes. I test also the 3 pins of the compressor to ground it has a resistance about 10kohms. So I need to replace compressor?
Thank millions bro
an alarm (compressor B fault) in a 30rqm / rqp 160-520 heat pump. Is the problem in the soft or the ccompressor?
I got a hp 3 ton scroll ,comp plug burnt up. replaced compressor and plug. start up pressures equalized amps at 2.0. rated for 12amps. 208 1phase. replaced IT again, start it up same thing. any ideas?
Could a guy ruin the thermal overload by getting the compressor too hot on a swap out because he didn’t use any method to help keep it cool while brazing??
What if my start to run ohms don’t add up right. Like 30% off?
Hello. My fridge compressor got a reading:
1) 7.5 ohm
2) 17.4 ohm
3) 24.6 ohm
Is the compressor is good?
Thank you..
No the compressor ohms is to high which means the compressor is defective
My reading is off by 0.6 ohms, 1.5 plus 3.2 gives me 4.1 ohms instead of 4.7, it's my compressor broken?
My AC Breaker trips instantly when setting to cool. The outdoor unit is a Carrier 2020 model that was installed new last year. Anything ese I can try before having to call a tech? short on cash.
1. I tested the 3 compressor pins and they all show OL.
2. I disconnected the compressor to see if breaker would trip without it and breaker does not trip, Fan Spins also.(This makes me think there is not an issue with Breaker nor contactor and maybe it is an issue with the
compressor or wiring.)
3. Outdoor unit is very clean, and I dont see any visual wiring issues.
Hey there, did you find the issue? My compressor does the same thing. Tests fine but trips the breaker when powered up. Not getting any replies on here.
I did try disconnecting the earth lead on the compressor briefly just to see if it would run... and it runs perfectly. But it makes the housing live!
@@tonyp6088 Yes, I had to get the compressor replaced. Luckily My compressor was still under warranty.
@@tonyp6088 I was charged $1700 for repair, which is alot more than I wanted to pay.
good job
Thanks
What side you open 1st when you install a condenser,, low side or high side?
Don't Matter but most techs go for low side the thick pipe
@@sergiodoordie319 uh..no. always liquid side (high side) first.
Or as the resistance goes higher the the current goes lower !
What if the resistance from start to run is very very low like 1.89
And adding up both values equals 1.98
On a powerful unit maybe that low is normal
Might be a silly question, but; do 3 phase units need to be located in areas where three phase is available or do they come with a unit of capacitance and coil/s to artificially make the third phase?
Thanks
your right its a silly question but thats okay. theres nothing wrong with asking a question so long as you realize that. 3 phase units are generally installed in larger commercial buildings, malls, shopping centers. They use large units that have multiple compressors and fan motors. They have special power panels that delivers 3 phase. I have actually seen a house that had a 3 phase roof top unit. Ive also seen 3 phase on a really old high rise pent house building. This guy bought 2 pent houses of the country club in las vegas and joined them together. hes got like 6 10 ton 3 phase Trane units. 2 many splits and im not sure what else. He bought it as is and i went up there. he had like 3 bad compressors, a bad control board, and ... a leak on one of the mini splits where it goes into the evap. Tons of problems. but that guy bought all that for hardly anything its probably worth a F load now.
@@hvacwiz7877 hard to believe 3 failed 3 phase compressors. Sounds like a dropped leg to me.
@@barbarafogle3541 good point. but it wasnt. lol. it was one of those crazy calls lol. ive seen so many even worse than this i did over 50k service calls. i had one where the fuse in the attic kept blowing. no joke an old dead dried up spider had on hand on the 24 and another on the 120 on the contactor in the condenser. i removed the spider and no more fuses blown. that sounds impossible but i swear to u its no lie. you see all kinds of crazy unbelievable crap
@@hvacwiz7877 haha. I had that happen with rain frogs. Only they got behind the control board in a mobile home split furnace. They come down thru the old fresh air makeup. Also up through the condensate drain on pack units. I probable changes that board 4 times before I found a frog all fried.
I like talking about this stuff. Ever found the tiny tiny little spider's web in a pressure switch on a gas furnace. Never know he was in there in till you take it apart. Work one day and not the other. Check it , it reads fine. You sound like a real tech , not like most of these parts changer.
You are great. A++++++
Wow, thank you!