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.
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)
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.
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 .
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!!!
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!
@@RefrigerationTech72 I figured to add my thoughts to an already good explanation on the service. I see you have been around the block a few times yourself. Be safe
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.
Typically on a rack system you have a oil separator or reservoir, it piped to a common oil return line that supplies oil to compressors via mech.float type or electronic oil level controller. However, some of the oil will mix with refrigerant flow throught out the syst. And hopefully will find it way back to the pump's crankcase.🤣
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?
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?
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...
I’m glad you are going into engineering for Cooling systems, we need more guys like you. My son also want to be an engineer. 👍. To answer your question. I don’t make videos that break it down like that. More just service repairs. Thanks for watching
Just went to a night trade school after work for a 1 year and then went to residential install for 1 year then light commercial for 1 year and stayed in refrigeration Super Market ever since. Love it. Thanks for the interest.
No need to order. They are two separate pieces. Regular gauge that they sell in singles and the brass fitting also sell. You can pick up at your local supplier United or RSD and others.
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.
If I understand your question correctly, the unloaders job is to run the compressor from 100% hp to 50 hp. It all depends on how many unloaders you have on one compressor. Also, It’s to reduce the stop and start of the compressor and extend its life.
@@RefrigerationTech72 Thank you. At 2:20: there are 3 compressors with capacities 20, 10 and 7 hp which are switched on/off by the controller's logic so that the sum is possibly close to the demand. There is also "Unld" item with status "ON" and HP=5. If asked to explain the operation of the system I could not do it and it bothers me. How does "Unld" relate to the compressors? Further help will be appreciated.
An unloader does two functions - in single stage compressors with two or more cylinders the loaders can be used to controle capicity ... in a v4 configuration an unloader could be used to "unload" one bank of cylinders and cut the capicity of the compressor in half. The unloader work by keeping one of the valves open so that particular bank of cylinders basically do not pump gas thereby they are "unloaded" ... the next duty they can perform is to unload the compressor when it starts - on rack systems that has a common high side header the compressor would be starting against the existing header pressure thereby putting a great strain on the motor windings. The unloader will keep the compressor cylinders unloaded while the compressor gets up to speed - then the unloader will allow the compressor to load up according to the controls design and the demand. Hope this helps ...
Thank you for your help. The idea and purpose of unloader is not foreign to me. In short - we have 3 compressors and 1 unloader. Is it connected at all? Is it used to unload the stage 1 compressor to achieve partial capacity? Is it used at stage 3 to enable/ease compressor start? Is it somehow used for all compressors? Diagnosis calls for understanding of all parts and aspects of a particular system. This is what I wanted to know.
@@Luzt. to answer that question a person would have to know if your 3 system compressors were staged on and off by temp or load - then you would have to see if the 1st stage was the compressor was the one with the unloader ... if that was the case then I would postulate that the unloader was a capicity control to reduce the first stage cooling capicity. I really dont see any purpose for the unloader on any other stage -- you would have to make sure it's actually hooked up and operating..
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.
@dioncurtiscurtis3188 after a year of working racks and supermarkets i can say that it is certainly the worst. The amount of missed time from your family. The opressive/demanding on call. Store managers asking questions about every though t including how good your wife was in bed last night. Waiting 45 minutes just to get a roof open. Then there's the wonderful store stafg w a cumulative IQ of 30%, mainly just getting in your way and commenting things they should just keep to themselves. Not to mention the driving from one end of life to the other w all the assholes that go along w it. God i can go on literally forever but the bottom line is stau the fuck away. Its not fun. The challenge eventually becomes inconvenience and it will wear you out. Period
@@RefrigerationTech72 wow... I'm about to start a new job at a hvac/refrigeration company and they mainly do supermarket ref, my experience is 1 1/2 restaurant refrigeration and I'm kind of hesitant due to the amount of components but your videos are helping a lot... 👍Keep uploading them 🙏🙏lol
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????
Filter driers are always a good idea.. no matter if the TXV has a screen or not.. some people are very sloppy doing commercial refrigeration and don't always pull a good vacuum or one at all.. so it will catch any moisture.
@@FlyEaglesFly19111 that's what the books say, but real scenario at friday night is totally different, if you're not a supermarket tech with 10+ years field experience you wouldn't understand what I said, my friend (respectfully)
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
Unfortunately you can't prevent it. Unless you manually shut down the compressor and close off all the valves to the compressor. Other than that I don't know of a way to prevent it. Thanks for your question.
@@RefrigerationTech72 I have a store that has 3 med temp compressors and the 3rd compressor runs only when there is a high load, the other two are able to run the entire store and the problem is that it always goes off on oil. I checked all the filter strainers, they are all clean. Maybe the oil is flowing into the other two compressors?
It could be. But do the oil floats to each compressor have an equalizer line between them to maintain an even oil level to each compressor? That will help.
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.
Another thing.. unless you front sest.. or turn on the valve some.. you will get no freon to the guage.. he should have used different hoses.. for less loss of gas.
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..
What do rack refrigeration techs make an hour?You do the best explanation of refrigeration on TH-cam.
Great video, clear explaining, I understood everything. Easy to following along. Thank you.
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.
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)
This was a great and informative video. Thanks for releasing it
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.
I 100% agree with that. I try to always to tell my guys to find the "Why".
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.
always deep in knowledge MR TECH ,so thankfully with all great service calls videos i do learn from you a lot thanks .
Excellent video.
Great job.
Thank you
Awesome video thank you very much for your teaching God Bless, hope you make more of this , tks again.
Masterclass. Thanks for share Gabriel 👍
You are an awesome tech !!!
Blessings
Happy New Year, I like watching you videos. You are a teacher 2021, we needs more🙏🙏🙏🙏🙏🙏🙏🙏 from NC, 🇺🇸
Thanks I appreciate that. More videos coming 👍
Happy to see you posting another good video, thanks!
Very informative...great diagnosis and solution...easy peasy....
Thank you for posting Learnt a lot
Wow this was a fantastic video. Thanks man great instructions 👍👍
Thank you very much for your teaching, very instructive, God Bless
Nice video, good knowledge, Thanks brother, keep post video ASA possible .
Bad ass bro!. I was wondering when your next video was going to be uploaded! Hell yeah good stuff man!!
I'm not sure when the next one will be, but not as long as this one. I will try to keep them coming sooner. Thanks for watching
thanks for the upload bruh! your the man
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 .
Welcome to the supermarket family. I'm Glade you like it 👍
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!!!
Wow!!, it's too long. Thanks for watching 👍👍
Good job, great video. Thanks for sharing experience.
Awesome video, thank you for sharing bro
Exellent and thanks go sharing.
Great video..... if the middle took oil from the right compressor, why did the middle also go off on low oil pressure ?
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!
Well said 👍
@@RefrigerationTech72 I figured to add my thoughts to an already good explanation on the service. I see you have been around the block a few times yourself. Be safe
your videos help me learn as an apprentice, thanks
That's why I make them, Thanks 👍
This rack has the wrong contractors in it.. they are not NEMA rated contactors.. this is NOT good for you to learn. Replace e with correct parts ONLY.
David Kuscavage can you explain further?🤔
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.
Typically on a rack system you have a oil separator or reservoir, it piped to a common oil return line that supplies oil to compressors via mech.float type or electronic oil level controller. However, some of the oil will mix with refrigerant flow throught out the syst. And hopefully will find it way back to the pump's crankcase.🤣
That was very awesome, thank you very much and god bless. Very good video
Your the best Sal thanks for your comment 👍
Nice , you are good teachers
This was an extremely good video
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?
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 have ran across this scenario and had to replace the compressor. Nicely laid out question. 👍
Just subscribed, looking forward to more great videos.
Nice job brother keep them coming
Great content
Superb 👍👍👍
Awesome video..........
thx a lot to share the info.god bless.
I am curious how the auxiliary wired in? And where is the power come in for it?
Thank you for the video great information.
Good stuff fun to watch, thanks for posting!
Funny how you smack the comp. with tool at the end once you’ve already fixed the problem lol
Awesome video man!
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...
I’m glad you are going into engineering for Cooling systems, we need more guys like you. My son also want to be an engineer. 👍. To answer your question. I don’t make videos that break it down like that. More just service repairs. Thanks for watching
@@RefrigerationTech72 where you learn this expertise? And what kind of job that you do now?
Just went to a night trade school after work for a 1 year and then went to residential install for 1 year then light commercial for 1 year and stayed in refrigeration Super Market ever since. Love it. Thanks for the interest.
Great video, bro
Nice 👍
The gauges u used without using a whole manifold what is that assembly called?
I wanna order it but not sure exactly the name of that gauge assembly u used to check oil pressure and suction pressure
No need to order. They are two separate pieces. Regular gauge that they sell in singles and the brass fitting also sell. You can pick up at your local supplier United or RSD and others.
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.
Great video A+++
Where is it? Is this Cooling storage house or Campus?
This is a Grocery store in a city called Desert Hot Springs, California
Excuse my ignorance, what is this "unloader" item on the list next to compressors does?
If I understand your question correctly, the unloaders job is to run the compressor from 100% hp to 50 hp. It all depends on how many unloaders you have on one compressor. Also, It’s to reduce the stop and start of the compressor and extend its life.
@@RefrigerationTech72 Thank you. At 2:20: there are 3 compressors with capacities 20, 10 and 7 hp which are switched on/off by the controller's logic so that the sum is possibly close to the demand. There is also "Unld" item with status "ON" and HP=5. If asked to explain the operation of the system I could not do it and it bothers me. How does "Unld" relate to the compressors? Further help will be appreciated.
An unloader does two functions - in single stage compressors with two or more cylinders the loaders can be used to controle capicity ... in a v4 configuration an unloader could be used to "unload" one bank of cylinders and cut the capicity of the compressor in half. The unloader work by keeping one of the valves open so that particular bank of cylinders basically do not pump gas thereby they are "unloaded" ... the next duty they can perform is to unload the compressor when it starts - on rack systems that has a common high side header the compressor would be starting against the existing header pressure thereby putting a great strain on the motor windings. The unloader will keep the compressor cylinders unloaded while the compressor gets up to speed - then the unloader will allow the compressor to load up according to the controls design and the demand. Hope this helps ...
Thank you for your help. The idea and purpose of unloader is not foreign to me. In short - we have 3 compressors and 1 unloader. Is it connected at all? Is it used to unload the stage 1 compressor to achieve partial capacity? Is it used at stage 3 to enable/ease compressor start? Is it somehow used for all compressors? Diagnosis calls for understanding of all parts and aspects of a particular system. This is what I wanted to know.
@@Luzt. to answer that question a person would have to know if your 3 system compressors were staged on and off by temp or load - then you would have to see if the 1st stage was the compressor was the one with the unloader ... if that was the case then I would postulate that the unloader was a capicity control to reduce the first stage cooling capicity. I really dont see any purpose for the unloader on any other stage -- you would have to make sure it's actually hooked up and operating..
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.
That’s what happens on a small rack that that. 👍
Lmao just mind blowing
@dioncurtiscurtis3188 after a year of working racks and supermarkets i can say that it is certainly the worst. The amount of missed time from your family. The opressive/demanding on call. Store managers asking questions about every though t including how good your wife was in bed last night. Waiting 45 minutes just to get a roof open. Then there's the wonderful store stafg w a cumulative IQ of 30%, mainly just getting in your way and commenting things they should just keep to themselves. Not to mention the driving from one end of life to the other w all the assholes that go along w it. God i can go on literally forever but the bottom line is stau the fuck away. Its not fun. The challenge eventually becomes inconvenience and it will wear you out. Period
I just found your channel and your videos are really informative, how long have you been doing supermarket refrigeration??
About 17 years now.
@@RefrigerationTech72 wow... I'm about to start a new job at a hvac/refrigeration company and they mainly do supermarket ref, my experience is 1 1/2 restaurant refrigeration and I'm kind of hesitant due to the amount of components but your videos are helping a lot... 👍Keep uploading them 🙏🙏lol
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????
Your right, I usually take them out when I need to.
ok thank you I was just curious about that 👌
He said that only when you have the small drier inside de case, NOT the main liquid line filter drier bro!
Filter driers are always a good idea.. no matter if the TXV has a screen or not.. some people are very sloppy doing commercial refrigeration and don't always pull a good vacuum or one at all.. so it will catch any moisture.
@@FlyEaglesFly19111 that's what the books say, but real scenario at friday night is totally different, if you're not a supermarket tech with 10+ years field experience you wouldn't understand what I said, my friend (respectfully)
Hi sir u do hand on training?
With who ever I work with I do
RefrigerationTech :( i wonder if u can train me for a cost. I need to learn it quick. Thank you very much.
thx for videos!
Good job
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
480v don’t hurt, you’ll lucky if you wake up. Thanks for the tips as always.👍
How do you prevent the oil from the working compressor not to get stored in the off compressor?
Unfortunately you can't prevent it. Unless you manually shut down the compressor and close off all the valves to the compressor. Other than that I don't know of a way to prevent it. Thanks for your question.
@@RefrigerationTech72 I have a store that has 3 med temp compressors and the 3rd compressor runs only when there is a high load, the other two are able to run the entire store and the problem is that it always goes off on oil. I checked all the filter strainers, they are all clean. Maybe the oil is flowing into the other two compressors?
It could be. But do the oil floats to each compressor have an equalizer line between them to maintain an even oil level to each compressor? That will help.
@@RefrigerationTech72 yes there are equalizer lines.
How many compressors trip on oil?
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.
Yes I always shut the oil line to the compressor and shut suction to comp.
Where do you get those quick connect gauges at?
Refrigeration supply houses.. United Refrigeration, Abco, R.E. Michael's somewhere like that.. internet maybe
Another thing.. unless you front sest.. or turn on the valve some.. you will get no freon to the guage.. he should have used different hoses.. for less loss of gas.
Vry infrmatv keep postng 😍
What fittings are you using for your gauges to check NOP?
Low loss fitting made by JB
@@RefrigerationTech72 what's the adapter that goes from the gauge to the low loss fitting?
don't you use quick couplings?=why not?
I don't use them, because I don't know what your talking about, lol
great job on diagnosis=az50
Hi sir would u do personal training?
Only train the guys our company hires
Great video!
That could all have been prevented if a electrical overload had being installed 😁
A+++
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..
What does nema mean?
Nation Electrical Manufacturers Association.
👍💯💯💯