Supermarket Rack Refrigeration - How a TXV and EPR Work Together Explained!

[@kevinobenauf7845]

Just started as an apprentice in rack refrigeration and hands down this explained a lot for me. Thanks and I will continue to binge through your videos!

[@natebrehmer663]

Are you still in the field? How's things going for you? I did HVAC commercial and Residential install for my first year in the field. Now I'm a service refrigeration apprentice.

[@chalkoutk8415]

@@natebrehmer663how's it going for you? im an apprentice at commercial refrigeration, fresh and green from trade school so a lot is confusing

[@Salvador-i6x]

I commend you sir. I fancy myself as having a good grasp on HVAC cycle, but you explained it very clear on the EPR function. Thank you.

[@Jimmyjimjimjim]

I appreciate the time and effort you take in making your videos.

[@florisderidder]

You are fantastic. You are a great teacher. I wish I had teachers like you in school! I’ve leaned so much from you!!

[@gendronhvac-r1269]

Thanks I am happy to help !

[@delvirodriguez2182]

Man you’re great at explaining, thank you very much. I subscribed right away!!!

[@alexmedrano8695]

Great video. Thanks for taking the time

[@MatthewHampton-w5u]

So if the pressure before the epr is 10 psi from your example instead of 16 would it stop at the epr until the pressure rises? 10:17

[@Randylazz]

Really enjoyed this video how would you go about adjusting evaporator superheat would you first have to adjust your EPR valve first?

[@gendronhvac-r1269]

1) you would manualy turn on Refrigeration. 2) check that pressure is correct and set if needed. 3) get case as close to operating condition as possible. 4) set txv Hope that helps :)

[@influenz1490]

Another great video! Thank you

[@SaresMLee]

The best explanation, ty

[@bullishbear2686]

Subscribed! You should get on as a guest on advanced refrigeration podcast and HVAC school!

[@gendronhvac-r1269]

That would be cool :) Thanks for the comment!

[@tonyp6088]

Great explanation, thanks

[@saltrue1555]

Very awesome video thank you

[@hvactech2966]

Appreciate your videos brother

[@steventorman3993]

Do you know anything about Sporlan SORIT 12 piloted valve? It modulates, but I do not understand why the solenoid opens and shuts and how the discharge pressure helps modulate it

[@HVAC_rob]

Got into the SORIT EPR valves with the solenoid the other day but don’t understand completely a video on those would be awesome, good job expanding this

[@Ihartdabears85]

I recommend downloading the sporlan orit/sorit valve manual it helped me understand them a lot better. They are new to me too but not super complicated.

[@steventorman3993]

BTW, great video, I think most of the ones I look at have an LSS as well.

[@Ihartdabears85]

We have to deal with time on target with a +\- 2.5 degree deadband. Dialing in both valves can be easy as long as your cases are in good shape. I only make adjustments once I have verified case condition or you’ll be fighting adjustments due to other factors

[@dereksosa5801]

Perfect video just what I need please keep uploading videos like this I'm new to the refrigeration trade and videos like this really help me out to better understand the trade thank you

[@paulpowers2861]

How come in large racks like you work on oil doesn’t sit in the evap after a while? If I put an epr on my small walk in cooler/ freezer it’ll log the Evap with oil and my compressor will eventually die.

[@gendronhvac-r1269]

So I think it depends on if the epr is solenoid operated or not. 95% of our eprs are solenoid operated. So the way I have seen it on most single condensers is a liquid line solenoid and then there is a epr after the evaporator coil without a solenoid. So when the system goes in the defrost the liquid line shuts off the liquid and the compressor will usually pull down the suction side until the low pressure control Cuts in. Now because the epr keeps the case at a relatively constant pressure there's never a dramatic pressure drop that would vacate the evaporator coil of oil. If you use a epr that has a solenoid and you use that epr to control the refrigeration rather than a liquid line solenoid valve. What will happen is the evaporator coil will fill up with refrigerant it will usually stop around like a 100 to 110 PSI. When the system activates the epr solenoid there's a huge rush because of the pressure differential this huge rush of refrigerant will vacate any oil stuck in evaporator coil. I don't know if you could apply the same concept to a single condensing system because I don't know if the compressor could handle the liquid flood back. Anyway that's what I believe to be the correct answer there might be more to it than that as the systems are very complex. But as always remember I'm just a fellow on the internet so double check and ask around there might be more to it. But that is what I can think of offhand

[@EarlHayward]

Shorter answer… Oil separators and properly designing the system to maintain refrigerant velocity with trappings placed on refrigerant lines…

[@rocker8692]

If thr EPR can only hold back refrigerant, how could it ever get higher pressure past the EPR valve?

[@gendronhvac-r1269]

In a working system On the compressor side of the e.P.R. It will never be higher presser than the evap side. Hope that helps

[@rocker8692]

Thanks got it​@gendronhvac-r1269

[@LifeisAmazingify]

What is the metal thing on your finger?

[@gendronhvac-r1269]

In which part of the video?

[@LifeisAmazingify]

@@gendronhvac-r1269 it was something in the middle of your finger, it looked like a piece of metal during the drawing explanation. I was just curious what it was

[@gendronhvac-r1269]

@@LifeisAmazingify I'm not sure but there is no metel in my finger lol 😆 It look like it could be grease maybe not sure. 🤷‍♂️

[@LifeisAmazingify]

@@gendronhvac-r1269 Ok then it’s something, 7:08 pause, backside of your middle finger. Btw I do enjoy your videos, for some reason I am just trying to figure out what that is lol

[@gendronhvac-r1269]

@@LifeisAmazingify I have no idea and now it's bugging me. That time stamp 7:41 If you pause you can see it in all its glory and I don't know what it is I'm sorry bud I guess this is one of those things were going to have to ask God when we die. 🤣

[@sjefoekel6058]

Very interesting. This set up isnt common here in the eu, we just close the solenoid when reaching temp, only use epr when there is necessity of keeping higher evap temp. Energy savings here is usualy achieved by triyng to lower the condensing temp, and raising suction pressure at the rack.

[@gendronhvac-r1269]

Thank you for sharing I know the states are trying to move towards a more European model of environmental standards so it's good to know what you guys are up to :)

[@sjefoekel6058]

@@gendronhvac-r1269 thank you for uploading learned alot👍👍👍, it is nice to see different aproaches.

[@robertpeters9438]

Good explanation of EPR but a bit too simplistic for my taste. But, entertaining enough that I watched anyway. Good video.

[@paramboytv7378]

Thx!!

[@shine-cg9uf]

👍💪❄🇺🇸 thanks very informative vid.

[@johnhenderson4335]

Wow, nice

[@gendronhvac-r1269]

Thanks !

[@madisoncooling8010]

What ..no really what ...

[@gendronhvac-r1269]

Was it helpful ?

[@sabrinalinh1]

Why is your accent bipolar?

[@gendronhvac-r1269]

Why are you so beautiful. These are existential questions that cannot be answered.