Damn dude you explained everything so well, you’re very knowledgeable, thanks for taking the time to film and edit these videos for all of us. I hope to see some more of your work soon. God bless you.

Your videos are always so informative, and top notch. Thanks for posting.

always deep in knowledge MR TECH ,so thankfully with all great service calls videos i do learn from you a lot thanks .

This was a great and informative video. Thanks for releasing it

I like the way you wait on the switch on power up and listen i'm always jumpy as well, you have good habits keep the videos coming love it thanks.

Happy to see you posting another good video, thanks!

Awesome video thank you very much for your teaching God Bless, hope you make more of this , tks again.

Great job, great video, great explanation of the whole process.

thanks for the upload bruh! your the man

Thank you very much for your teaching, very instructive, God Bless

Great video man! Awsome way to teach! Just a FYI on these rack the low pressure control aren't part of the safety, they are part of your control strategy when E2 isn't working (like if your rack run without its brain those LPC should cycle on/off all compressor to maintain temp)

Masterclass. Thanks for share Gabriel 👍

Wow this was a fantastic video. Thanks man great instructions 👍👍

Excellent video. Great job. Thank you

Thank you for posting Learnt a lot

Very informative...great diagnosis and solution...easy peasy....

Thank you for the video great information.

Good stuff fun to watch, thanks for posting!

Nice video, good knowledge, Thanks brother, keep post video ASA possible .

Good job, great video. Thanks for sharing experience.

Funny how you smack the comp. with tool at the end once you’ve already fixed the problem lol

Blessings Happy New Year, I like watching you videos. You are a teacher 2021, we needs more🙏🙏🙏🙏🙏🙏🙏🙏 from NC, 🇺🇸

I like how you try to find out the original problem as to why whatever happened, happened. I’m the lead service guy where I work and I’m always on this one tech because all he seems to do is reset something and leaves. Then the customer is pissed off because of the recall.

Awesome video man!

You are an awesome tech !!!

Only seen this video. Great video .I don’t work on racks .How did the compressor with the bad contractor which was off on oil diff suck the oil from the good compressor on its left?

Bad ass bro!. I was wondering when your next video was going to be uploaded! Hell yeah good stuff man!!

Just subscribed, looking forward to more great videos.

Nice job brother keep them coming

Hey ref. tech glad to see a new video, I was wondering if you was still uploading. It's been 1 year since I started doing super market ref. And I love it , and I've learned a lot too . It's challenging too. I've working with a good techs too and that helps alot . Thanks for the videos too .

Exellent and thanks go sharing.

This was an extremely good video

Awesome video..........

What do rack refrigeration techs make an hour?You do the best explanation of refrigeration on KZfaq.

thx a lot to share the info.god bless.

Great video..... if the middle took oil from the right compressor, why did the middle also go off on low oil pressure ?

Awesome video, thank you for sharing bro

Nice , you are good teachers

That was very awesome, thank you very much and god bless. Very good video

Great video, bro

Great content

thx for videos!

Great video A+++

Vry infrmatv keep postng 😍

Superb 👍👍👍

Heyyy! I knew you sound familiar Mr. G, this is Gio from team 5 almost 10 years ago, man time flies.., you got some awesome videos and content brother, so glad to see you doing great, keep it up brother!!!

I am curious how the auxiliary wired in? And where is the power come in for it?

your videos help me learn as an apprentice, thanks

With only have L3 contractor welded, and L1 and L2 open, that's not single phasing. On a three phase you can drop two legs and not be single phased. Common to see manufactures to do that so they don't have to buy 3 pole contactors.

Refrigeration Tech, I have a question for you on the oil differential switch trip in this video. It is as follows: Is it possible that the compressor whose oil differential switch was tripped was caused by "blow by" around the pistons during the upstroke of the pistons due to the piston rings being worn down AND as a result of them being worn down, the clearance between the piston and the cylinder walls became wider than OEM specifications? I ask that question because a wider clearance space would allow some of the gas being compresed on the topside of the piston as it upstrokes to blow by through the clearance space and enter into the compressor crankcase. After a long enough run time under those conditions, the crankcase pressure would become high enough to close the oil return check valve that separstes the crankcase comparrtment of the semi-hermetic compressor from the electric motor compartment of the semi-hermetic compressor. Wuth that oil check valve closed, oil would not be able to return from the motor compartment to the crankcase compartment and eventually with a long enough runtime, there would not be enough oil in the crankcase which would trip the oil differential safety switch, taking the compressor offline after a brief two minute delay to see if the oil pressure recovers in time to keep the oil differential safety switch from opening. Once the oil switch time delay times out in about two minutes or so, the compressor would trip offline. As it sits idle, its overpressurized crankcase compartment would slowly decrease in pressure until it drops low enough for the oil return check valve to re-open which would then allow all of the backed up oil in the motor compartment to flow into the crankcase compartment, properly filling it. By the time a service technician arrives and discovers the oil safety switch is tripped, he then looks in the oil sight glass, but the oil level will be normal because the oil return check valve opened as explained above and re-filled the crankcase. This would confuse many technicians who do not know about blow by and how to check to see if it is occurring. Have you run across the scenario I just layed out in your career?

I just found your channel and your videos are really informative, how long have you been doing supermarket refrigeration??

great job on diagnosis=az50

Nice 👍

Good job

Before you touch anything electrical, always test for power with your meter!!! If you are running a 460 volt control circuit and you get hit, it will hurt big time, or kill you! Also, this is the only time you can and should go from terminal to ground. This is because you want to make sure there is no stray voltage. Otherwise, when you test a control or contactor that is 208 volt or 460 volt you only go from terminal to terminal. in the case of a 115 volt circuit, you can go terminal to ground. If you are working with someone and he says, " power is off, or "it's dead", fine, never trust anyone! If I am working with you and I ask you to change the contactor, I expect you to take out your meter and test for current. I will not be offended. This tech is correct about the oil, somewhat. As far as oil empting from one compressor , if the rack has a common oil line, (not the oil feed line) but a oil line that goes to all three compressors, the oil should stay put. The one thing that should be done is to test the pressure difference between the suction line and the oil line. Put your gauges ( you should have 2 sets) one on the suction line and one on the oil feed line. There should be a minimum of 5 lbs higher in the oil line than the suction. Some racks have 10, 15, or 20. The check valve that makes the oil pressure difference is either on the top of the separator or there is a valve that resembles an expansion valve on the oil line. The oil line pressure HAS to be higher than the suction so the oil can go into the compressor crankcase. If you don't test this, a call like this may come in again tomorrow night at about 2am, while you are dreaming about the girl next door. When you have a rack that has high suction pressure for a long time, and you start it up, the suction pressure will drop quickly, causing the refrigerant in the suction line to boil off and create foaming and a good amount of oil will come back to compressors. Now, at this point, I know there will be someone saying " the suction line is not supposed to have liquid liquid in it" Yes, you MAY have enough liquid in the line sets to make this happen. Don't forget, the line sets may be in the floor and they are cold. And where does refrigerant tend to hang out? where it is cold! Also, check pressure drop across the oil line filter as it may be plugged. At some time on your visit. you should also feel the oil discharge line from the separator get warm. The float in the oil separator should open and close. it is not supposed to be hot all the time. If it is hot all the time, then the float may have broke off and the needle valve is stuck open. If it stays cool all the time then the oil separator may need to be cleaned or replaced. Old oil separators have screens in them. One type, Eaton 506 or 507 has a screen shaped like an ice tea glass. They should be cleaned yearly. If they plug up, a good chance the bottom will blow out and it will never do what it is supposed to do. The one thing I think the tech missed telling you, is that the coil on the contactor may be a separate circuit. Many racks you have to shut the control circuit breaker off to change the contactor. There are a couple racks that uses the high voltage power to run the coil. Again, in changing a contactor, when you shut off the breaker above the contactor, test for coil voltage! btw, I have worked in this field for 35 years, on racks like this one. Be safe!

So the high suction was caused by only one compressor running because the middle compressors contactor was no good and that caused the 3rd as well as the middle compressor to shut off on oil safety because oil was getting dumped into the compressor and had nowhere to go since the compressor wasnt pumping anything. All caused by one contactor.

How does one compressor stealing the oil from other compressor? Theres no mechanism to control oil for each compressor independently? Of all those control i think the oil control is the most difficult one to deal with.

FYI dude. When you checking for voltage you always need to check each phase to ground. When you check phase to phase it takes power on both legs for you to get a reading on your meter. If you have a bad breaker or disconnect that has left one leg hot all your meter reading will be 0 volts if compared only to another leg that is open. Be safe guy - 480 hurts

Refrigeration Tech, I've herd that liquid line filter driers are only used for start ups....and that you dont need one if your Txv has a inlet screen????

Great video!

Do You have video that shows how to assembly that Cooling Systems from scratch..? I am 2nd semester Building Engineering Degree that 80% focuses in Building Refrigeration...

The gauges u used without using a whole manifold what is that assembly called?

A+++

What fittings are you using for your gauges to check NOP?

Excuse my ignorance, what is this "unloader" item on the list next to compressors does?

Is it required to close the oil line if your front seating the suction valve to check valves on compressor? Another method is checking crankcase pressure at comp, than suction pressure and this will tell you how much blow by your getting.

don't you use quick couplings?=why not?

Where is it? Is this Cooling storage house or Campus?

Where do you get those quick connect gauges at?

That could all have been prevented if a electrical overload had being installed 😁

How do you prevent the oil from the working compressor not to get stored in the off compressor?

Hi sir would u do personal training?

Get a go pro..this way for safety to use two hands.. also get yourself leads with sleeves.. this way if you do slip you don't ground out especially with 280-460v How about the seperator..has it been dropped and cleaned??? Racks SHOULD have filters changed every year.. and oil changed in Rack every 3 years. That's good practice of commercial refrigeration...wrong contactors..they aren't NEMA rated..they ALL should be changed out immediately!!! Cause those are not rebuildable.. again another maintenance item per year!! You better change out that contactor to a NEMA..Copeland REQUIRES it on change outs D3 D4..

Hi sir u do hand on training?

Miss your videos are very informative