HVAC: How To Test a Single Phase Compressor & Check For Any Grounds (Insulation Resistance) Ohm Test

[@Ferreira-qq9cd]

OMG the way you explain it is amazing. Specially, with someone with dyslexia that makes my job so hard you just made it so easy explain it. Thank you.

[@professormantle7959]

You are so clear and audible. So clear and not too fast not too slow. Perfect. Thanks, so helpful

[@haroldseals5935]

This is by far one of the best explained videos on troubleshooting compressors posted period! What a great reference. Thanks so much.

[@kennyd-f7l]

Like the rest of the guys have said, great way to explain this compressor trouble shooting, I can rest this weekend ! Thanks again

[@takatastore6338]

Your videos are so valuable it's crazy....I just started in the industry and I have been learning so much from your videos... thank you very much for your time and work

[@Kevin-zx7ll]

It good

[@Wlladdd]

Great video, easy to understand. It would be great to add amperage test to this video. Thank you!

[@roberts1159]

Nice job explaining this. Makes sense that run to start would equal two common to run and start since resistors in series are equal to the total.

[@fereidoondelfanian9102]

Good job! Very clear and easy to follow demo.

[@flexortiz92]

I’m ballin like an athlete but got no Jumpa! Jumper man tech back at it again good shit bro

[@JumpermanTech]

Lmaoooo thank you bro! Stay safe out there & stay tuned for new videos every week🔧

[@davonetoney475]

You made your explanation clear and simple.

[@zartalks]

Super helpful video ....and its easy to understand when we know what to look for and what not to look for ...thanks a lot

[@stinkyvonfishstix4196]

your above and behold. keep it up, your teaching

[@DrKay-kt8oz]

Greatest video on the subject matter.

[@gregbradshaw9415]

Love your videos! Very informative

[@ahmedsawni862]

Thank you so much for sharing the knowledge 👍

[@rafaelretiz31]

Great video bud, Love those drawings as well. Keep those videos coming. Thank you.

[@skydyver97]

Now this page is super 🔥

[@vesiwiw6]

Outstanding video - you have great knowledge of the subject and explain it clearly. Thank you

[@georgeslandi6720]

Thank you for this

[@JohnNikolaou-c3g]

Great man - keep it going amazing explanations with detail

[@bettalinks]

Perfectly executed thank you for your knowledge

[@kitwahlai236]

Very clear instructions. Thanks. Allow me a little comment, the running coil should be of higher ohm(thin wiring). Starting coil is thicker wiring and thus, lower ohms.

[@harryschrysan3183]

You have those mixed The start has more turns and thinner wire and the run less turns and thicker wire. Run had less resistance to Start!

[@alphabears6342]

Does the start and run has to be exact when adding com to run and start to com? I have a compressor that has S - C : 4, R - C: 4.3 and S - R : 8.0 instead of 8.3. Does that make the compressor bad?

[@MustangWes]

Great information well put together. Professional video easy to understand.

[@privatename3621]

Great video. But the only thing this and other videos leave out is what happens if the sum of resistance readings DON'T add up. Meaning, what does that look like? I'm in that situation now, as a DIY trying to diagnose my compressor after replacing a bad 2-pole circuit breaker (one pole was bad) and finding the one of the terminal wires blown off which shorted to the casing and tripped the whole house power (ac cb's are on same outside meter panel as main shut off). Anyway, I get readings across all 3 pins, all under 10 ohms, but the C-S winding is reading high, thus the S-R sum doesn't match up with C-S+C-R. Frustrated. Waiting on new connector wire kit to arrive before I can hook it up and retry, but worried it might blow out again with this odd readings. I just don't know what typically happens in the field in this situation. No one seems to cover that part.

[@izzybell11]

Informative, interesting and helpful video. Great job JMT. ⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️⭐️

[@JumpermanTech]

Thank you thank you! ⭐⭐⭐Stay safe out there & stay tuned for new videos every week🔧

[@khaoticman3055]

@@JumpermanTech yo i got a question what do u mean when u say your grounded when checking the restistance of the compressor?

[@jollyscaria1922]

Seldcomprssor terminals c .s and Rare identified by measuringrheresitance ohms between the terminals usingmultimeter or clamp meter the resistance of ruing winding is low while thatofstarting windingis high when the multimeter pords are connected to twrminal R and c resistance of ruing windingor the low est resistance is indicated whwnthe connected to terminals c r and s total resistance of both qinding is indicatwd when the terminala c and s are connected to the meter the resistance of starting winding is indicated or the value willbe bet ween the abovetwo rhe high est resistace ind icated bet wen r cthe resustancc and sthes two sum of resistance of ruing betweenr and c and starting windingbwtqeen c and s is to r and s hight expls 1.2 50 2.3 30 .1.3 20 lowesr 1.2 rs 2 3 cs 1 3 r 1 r 2 s 3 c hight reding 50 medom 30 low 20 low est restnc rc highest r s 13 lowes

[@ejioforprecious6108]

Cool explanation ❤🎉❤

[@neilvestervictor180]

great explanations

[@JumpermanTech]

Thank you!

[@Goodfella0982]

You are the best at explaining any of this, very clear and concise!! My salute to you bro!

[@henrydang1644]

Thank you for the video!

[@cambullterrier4148]

This is good man, for a layman like myself! nice!😎

[@refrigerationconfidential4376]

This is a great video for troubleshooting for a compressor to verify if it’s good 👍🏽

[@JumpermanTech]

My guy!!! Thank you! Appreciate your feedback very much🙏 If anyone is reading this, check out his channel "Refrigeration Confidential" for some great content! Much love🙏✌

[@alexeytech1495]

Well explained material. Well done job.

[@JumpermanTech]

Thank you! Much appreciation🙏🙏🙏Stay safe out there & stay tuned for new videos every week🔧

[@kensmith1104]

Thanks a lot, very helpful

[@JumpermanTech]

Thank you! Stay tuned for new videos every week🔧⚡️

[@johndaniels5407]

Excellent video 🎉 Thank you for sharing 🙏🏾

[@jmc6940]

What are the factory resistance values?

[@beemikeme]

What is the ohm readings from C - R & C- S do NOT add up to the reading R - S?

[@brandongazetti5057]

You have a bad compressor windings

[@beemikeme]

@@brandongazetti5057 That is what I thought, a bad compressor. I added a hard start kit 2 summers ago and the condenser has been running fine ever since.

[@brandongazetti5057]

It will for a while but at that point your running on borrowed time. I would start thinking about replacing or replacing the compressor

[@beemikeme]

@@brandongazetti5057 Ya, I am already surprised it has lasted 2 summers. I certainly don't think it'll last forever.

[@jd5787]

Best. Explanation. Ever. Thanks! So my compressor is good, there are no shorts BUT it is not cooling... What gives if it not the relay then? Too much gas topped up last time? (I noticed the compressor was running very hot). Its a wine fridge so not as complex as a fridge/freezer...

[@duongduong1387]

Supper supper helpful. Thank you very much.

[@Mex710]

Thanks for that great explanation

[@rolandubaldo3965]

Thank you you save me a lot of money

[@belayrebi8415]

Really good really good thank you

[@btd1993]

super informative! thanks for sharing

[@calebmcauley9220]

Excellent video 👍

[@shalehinshaari2878]

Great video. How about 3phase compressor? Thanks

[@JumpermanTech]

Thank you very much! I made a video on 3 phase compressors too👍 Heres a link🙂 kzbin.info/www/bejne/Z5vEYnqhgbylrcU

[@thesetruths1404]

What is the typical operating temperature of a common kitchen refrigerator compressor? A modern one, less than 10 years of age. Mine is running 125F when not running, and up to 170F when running a lot to restore fridge and freezer temps. Is this fine? Thanks.

[@ld7103]

Great video but does that meter go to 1 M ohm? Just my understanding u require that scale to do the insulation test?

[@softwarephil1709]

A high voltage “megger” insulation tester like a Fluke 1507 would be the best way to test resistance to ground.

[@HVACR559]

Most shorts to ground are low resistance, so a megger isn't always necessary. The 902 FC only goes into kΩ, he needs something that can at least get into MΩ. FLUKE doesn't really consider the 902FC to be a true DMM for this reason. The biggern problem is that he is doing comercial work on 480v 3∅ systems. The 902FC is only rated to CAT III 600 v it does not provide enough protection from transient voltages that can be present on a 480v 3∅ line. In this environment it is important to have a DMM that's properly rated and fused to CAT III 1000V. Don't mistake CAT II 1000 v to be the same as CAT III 1000 v because it's not. Only use the OEM fuses that are designed not to explode with an arc-flash like a standard glass fuse will do if something unfortunate happens. If you only do residential 1∅ work a CAT III 600 v should be fine but I would still opt for a DMM with the higher rating.

[@jvm3753]

Really enjoyed the video. I have a chest freezer; stopped working, but caught in time to save the food. Did the resistance check on compressor; all checked good. Overtemp switch, checked good. Relay checked good. I replaced the overtemp switch & relay; still won't work. Could the compressor be stuck? If so, how can I prove that? Thank you.

[@jollyscaria1922]

Vrey good gueshering gues all best welcomed gues thanyou gor allgues shering gues guied allgues thkyou somuch ..

[@luisloks]

Common and run show a reading of .6 while the left side show 8.6. Making a total of 9 Which sounds good. But is that .6 reading maybe too low indicating a worn out compressor?

[@yonastesfaye699]

Thank you

[@mtbbiker6401]

Hi. I checked my compressor using your instructions. I couldn't access the compressor directly because I can't reach it (5 ton system). I disconnected the wires from the contactor and the capacitor. I first checked for ground shorts. No shorts. I then checked resistance. My readings are a bit off. I'm reading 1.4, 1.0, 2.0. So it's not adding up correctly. Does this mean my compressor is going bad? I checked the amperage draw while running. I get different reading before and after the contactor. I get 16A (terminal side) and 21A (load side). Is it normal to get different Amp readings before and after the contactor? The RLA is 26A on a 5 ton heat pump. Thanks.

[@wadoodmohd1870]

thanks

[@isaacaugustine2364]

Thanks for sharing

[@David-hj6if]

Very easy to follow instructions. Made perfect sense. Thanks, keep up the good work.

[@Sroor90010]

So I’ve checked if I got 1.2 , 3.1 and 3.8 so is the compressor ok ?

[@stefanschuster8971]

I got 2.5 run 3.5 start and 4.8 5 .5 for run + start

[@stefanschuster8971]

Unit ran for 1 second and would shut off . Got 50 amps when lra is 40. Chnaged cap , relay and tried a hard start. She wouldn't go. No high limit no lpco no continuity to ground... how would you finalize diagnostics. It would run when you bump started it as well but didn't seem to have too much power behind it .

[@Sroor90010]

Mine is ok I’ve just changed capacitor nothing else and it’s cool now

[@jollyscaria1922]

Thankyou gues welcomed

[@andrewmogeni-f6p]

What if the leadings are high in resistance when checking windings like cs- 35.6, cr-22, sr59.9

[@chicocash9668]

good info thanks

[@w.manders2817]

in other videos it is said the Ohm's between the 3 should be more or less the same, instead of the top 2 = the bottom 2, why is that?

[@harryschrysan3183]

What does top 2 does even mean? 😅 There is no such thing, you have to determine which is start and ran. Some times you can't read which one is which and have to find it yourself doing this test. Now for a single phase compressor the start winding has higher resistance between S and C, always! R to C has lower and the combination should equal to the two other findings. Small discrepancies like 0.5Ω to no more than 1Ω should be fine. Now, 3 phase motors should have ALL of their windings at the same resistance value. It's as simple as that. 🥂 Cheers

[@wannabeelektwicityman268]

Does it make any sense that my windings ohm out correctly but are shorted to ground?

[@yayapagaming425]

Good job brother

[@JumpermanTech]

Thank you very much bro🙏 Thank you for watching🙂Stay safe out there & stay tuned for new videos every week🔧

[@paulb9769]

Hi could you please explain something to me. I have just seen a video where it is stated that a PTC is connected to the compressor and not a BiMetal cut out. Surely it can not be a PTC?

[@ekie85]

What happen if I got 2.5 and the others add up to 2.7? Does it mean it is bad?

[@brianmuthomi9594]

What causes running winding to read higher resistance than star winding

[@kevinbergen1565]

So for a Samsung Compressor with the S-C-R scheme, I get readings of S-C 7.2 ohms, C-R 7.5 ohms, R-S 7.2 ohms but none went ground to copper. Is my compressor good or bad? One more note, the compressor- MKV190CL2B is label rated as 240VAC 3 P- Huh? I'm only providing residential from-the-wall 120VAC. How can it work?

[@PuddinJr1993]

It is 3 phase, the 3 phase is created by a pulse width module signal from the inverter control board that converts single phase to 3 phase. In the Appliance tech world we see more dead inverters dead then compressors on Samsung units.

[@wojciechszymanowski]

What If my mesurements are S-C 32ohms ; C-R 25ohms ; and R-S 57ohms is It Ok?

[@kennethlobo4420]

Great explanation

[@darwingarcia8491]

What if the compressor still had refrigerant charge is there difference in reading?

[@shamsheralam8862]

Very clear thanks

[@DoraYbarra-q1g]

awesome

[@blndhayder3553]

hello,what if S/C,R/C,S/R give same reading nearly all three are 17.5 ohms

[@fariesmech]

What is the shell temperature allowed for compressor

[@liquidmocofilmsllc4915]

I can't find any videos on MECHANICAL FAILURES of a compressor. I have a compressor that the windings are fine but makes a ugly loud noise at start up and then trips the breaker. Anyone know of a good video to check for mechanical failures?

[@JumpermanTech]

I have many troubleshooting videos on my channel so subscribe for new videos every week! Sounds like locked rotor on the compressor. Check the compressor specs for LRA. Locked rotor amps. Upon startup, check amps on the compressor and if it's really high and matches the LRA versus the RLA (Running load amps) then you have locked rotor and the compressor needs to be replaced. Before determining that, make sure your start/run capacitors are good. If the caps are good, your compressor is bad and needs to be replaced. If the capacitors are bad, replace them and see what happens. Most likely will solve your issue. Thank me later 😅

[@mtbbiker6401]

Great video. thanks. If you have a ground short or OL when checking resistance, may the compressor still run or do you only perform these tests if the compressor won't run?

[@jollyscaria1922]

Diffrant reding conunivet showing good runig starting point como n low restisans ok

[@alfredfu7052]

It helped. Thanks a bunch

[@moholie]

💯

[@alvincee7605]

❤❤❤

[@faphosy38]

YOU JUST SAVE ME $2k.THANKS

[@deddie4645]

Nice

[@FatBoy7.3Powerstroke]

Excellent..!!

[@matthewnaidoo8606]

What if the number dont add up ?

[@bherna10]

That’s what I want to know

[@HVACRDUDE]

I'll usually run a sj cord from the vans battery to ground on the door frame into the unit. If I 1890kohmsufs to frame from van it's a working canuuter oscillator

[@JumpermanTech]

👀👀👀👍🔧✌

[@TheWpruden]

Nice video However when checking for shorts a megommeter should be used.

[@JumpermanTech]

Thank you! A megohmmeter is definitely the best to use 💯 Need to make use of what you have though. Thanks for watching! Stay tuned for new videos every week🔧

[@JacksonJoy-vc3lv]

Thanks bro I did that on my R600 c/s give me 2 and the c/m give 2 and with the conclusion of the s/m gives 4 it’s a good compressor 😢

[@4g63a1]

This is so hard for florida hvac companies to teach their guys. All they want is a body in the field to drop a bill.

[@MiguelGutierrez-gv3yy]

What if your C to S is the lower than your C to R?

[@rocker8692]

I have a question,can you have all the winding check out good,but still inside the compressor it can be mechanically brokin inside?

[@harryschrysan3183]

Yes, if it has lost oil the compressor can cease. The crankshaft can be fucked, reed valves can be broken (reed valves don't apply on scroll compressor).

[@nnaemekaiwuozor8972]

This is good

[@josselindesir5409]

Goooooood job man

[@nothingeverything6708]

What is that meaning open and close winding?

[@louisdreyer7523]

Two types of shorts can occur in a compressor motor, a turn-to-turn short within a winding or a winding-to-frame short. The reading obtained between the Run and Common, and the Start and Common pins should be within .5 ohm of each other. If these readings are significantly different, the winding with the significantly lower reading has a turn-to-turn short and the compressor needs to be replaced. Check for a winding-to-the-motor- frame short by taking a reading between each of the pins and the compressor housing. If the meter's LCD displays anything other than an "O.L." during these tests, the compressor is bad and needs to be replaced.

[@okotcharles5016]

I got compressor changed run cap but was only harm not starting

[@mralizebkhan]

Nice video

[@brandongazetti5057]

Be careful unplugging the compressor as you can pull the terminals out and can blow refrigerant in your face.

[@nnaemekaiwuozor8972]

I had a compressor, when I connect it directly without the relay and overload it cuts the fuse.

[@night_grinder1378]

What if S/C is OL If R/C is OL if S/R is 16 ohms

[@harryschrysan3183]

That sounds like an open overload.

[@darwingarcia8491]

Christal clear

[@shadrackagyemang9740]

Please what if the value of c-r=20.5, c-s=29.5 and s-r=50.5

[@pedropiernas3616]

means compressor seems good; check for isolation of the 3 pins now

[@91367]

Comment

[@checkmatenate]

Everything is good except the run to start reads the same as Common to start and Common to run. They’re not adding up.