RACK HIGH SUCTION ALARM!!

Refrigeration Training purposes only!

[moemoes]

Great video, clear explaining, I understood everything. Easy to following along. Thank you.

[apr]

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

[Reefertech]

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.

[jdref]

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)

[rocker]

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

[JaimeMartinez-uqwe]

Excellent video.
Great job.
Thank you

[rookierefrigeration]

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

[saltrue]

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

[shadowbanned]

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

[jorgeortega]

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

[saltrue]

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

[sparkytech]

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.

[adammiller]

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!

[SOLOOJESUCRISTO]

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

[Jeepjones]

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.

[JuanTodoli]

Masterclass. Thanks for share Gabriel 👍

[shanegreen]

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

[FireandFrostHVAC]

Happy to see you posting another good video, thanks!

[nunoaugusto]

Good job, great video. Thanks for sharing experience.

[gurjeetsingh]

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