Evaporator Pressure Regulating Valve (EPR) - HVAC Online Training and Courses

[@strimbimmin328]

Great refresher, re-entering commercial refrigeration after a few years in HVAC and these videos are helping me remember the in’s and outs. Thanks again!!

[@AirConAcademy]

William Eskridge I am glad I can help!!!! Good luck out there. If you have video suggestions let me know!!!

[@airjordan347]

Your writing skills....mindblowing 😨

[@AirConAcademy]

Ha ha! Thank you!!!

[@alexmedrano8695]

Great video. Really helped understanding how EPRs work

[@Pretzel114]

I just came across your channel. So glad I did. I just started on the refrigeration side at work from doing hot side food equipment. These vids are great! Thank you.

[@AirConAcademy]

Thank you!!! I am glad I could help!!!

[@leventnergiz]

Thats amazing! i was looking for this explanation for a long time. You helped me a lot.

[@AirConAcademy]

Thank you!!! I am glad I could help!!!

[@AirConAcademy]

@Dennis Arian good than you!!!

[@refrigerationconfidential4376]

Good video nice and simple good introduction for new technicians I enjoyed it

[@AirConAcademy]

Thank you!!!! I am glad you liked it!!!

[@luis1250]

Very nice explanation, thank you, but can't you achieve the same goal of different temperatures with a thermostat and a solenoid valve?

[@AirConAcademy]

interesting? but where is your solenoid valve? if it is before the metering device then no it would not work if you install it after the evaporator then it will be opening and the temperature of the evaporator will instantly drop to the saturation temperature of the low side pressure. what will happen you will have wide temperature swings which will not be good for the product in the cold room/refrigeration room. Your theory seems like it could work BUT the temperature swings would not be good. Thank you for your question!!! and thank you for watching!!!

[@JaykeSapalaran-iq3qs]

Great video information ❤ thank you for sharing your knowledge ♥️🇵🇭

[@AirConAcademy]

Thank you so much for watching and I'm glad you like the video!

[@rickchan3789]

Hi, so whenever you install a epr valve on a multi evaporator system the proper piping procedure is to install it on the warmest coil? And not the coldest right?

[@AirConAcademy]

Yes, correct I am sorry if I did not specify that on there. But you want to have one on the warmest coil so I can bring the temperature/pressure of the coil up to make sure it is at the desired temperature. Thank you for your message! And thank you for watching

[@wasimedoo7994]

Very good information R 22 suction line is 32 PSIG

[@AirConAcademy]

Thank you! And yes, by adjusting these pressures, we can have the evaporator temperature that we need. Thank you for watching!

[@nyanziabdallah944]

So helpful ❤

[@AirConAcademy]

Thank you so much! Thank you for watching, and I have a bunch of other videos that I hope will help you!

[@viviresbrillar]

Excellent! Really appreciated it too.

[@AirConAcademy]

Thank you! I really appreciate your comment !!!

[@Meech_g]

i dont get it, is this EPR valve able to regulate the pressure manually, also in the evap unit is it all these different temperatures in the coils ....or different fridge boxes ? one system

[@AirConAcademy]

The EPR valve will regulate the pressure in that one evaporator. If the systems has two evaporators, and they are needed at different temperatures than the one with the highest temperature will need the EPR valve. If you had a system with three evaporators, and they all need to be a different temperatures, the two evaporators with a higher temperatures would have an APR valve. That would be set to different pressures so that the pressure would equal the temperature desired in the evaporator. The other evaporator would not have one and it would be controlled by the pressure of the compressor. I hope this answers your question. And thank you for watching!

[@brianprelgo4553]

Do you have a video on the entire rack systems

[@AirConAcademy]

ohhh no I am sorry. I can try to do one later. sorry

[@christopherbrowne3236]

beautiful explanation

[@AirConAcademy]

Thank you so much! I really appreciate your comment!

[@subarkahasep]

Do we still need the EPR if we are using variable speed compressor / digital compressor for multi ecaporator with different evaporating temp?

[@AirConAcademy]

The EPR valve is going to maintain different temperatures in the evaporators. So yes you would still need an EPR valve even if you have a variable speed compressor. This way you can maintain different evaporators at different temperatures. Good luck and thank you for your question!

[@jessehndz3124]

WOW, Awesome Job Brother!!

[@AirConAcademy]

Thank you!!! I am glad you liked it!!!

[@scwarr]

Great explanation. How do I size the system or compress when I put EPRs into the system?

[@AirConAcademy]

I'm sorry, that is a very complicated answer. You have to know the size of the equipment or the room, and then what is going to be kept in there and head what temperature? He will also have to know what the heat transfer rate would be of the installation so you can make sure you can keep that area cool. I'm sorry but there is no easy answer to that question. There are several variables!

[@scwarr]

@@AirConAcademy So what do you suggest to do first? I know Menu J is good stuff to calculate the heat load but ......... Do you recommend any app that I can calculate the heat load easily?

[@AirConAcademy]

@@scwarr the J manual is good but it's hard to understand, I believe. The apps that you can get will walk you right through everything. It will make your life easier and help you earn some money faster! and I know that is one thing everyone wants to do, earn some money!

[@scwarr]

@@AirConAcademy thx

[@kyberking]

Nice video, thank you

[@AirConAcademy]

Thank you and thank you for watching!!!!

[@hg2.]

Well done. Thanks.

[@AirConAcademy]

Thank you for your comment! And thank you for watching!

[@unknown-qj7oh]

Appreciate the help!!!

[@AirConAcademy]

I am glad I could help!!!

[@sarveshms4500]

Thanks for the clear explanation! I'm trying to understand something. Would I still need an EPR if I don't have multiple evaporators? Or if I have split suction lines (multiple compressors)? I'm unable to distinguish the function of a metering device and an EPR in that case.

[@AirConAcademy]

If the metering device is going to drop the pressure as the refrigerant goes into the evaporator. The EPR valve evaporator pressure regulating valve is going to maintain the evaporator at a specific pressure, so you can have several evaporators at different temperatures. What that means is that if you have multiple save operators you can have evaporators at different temperatures. If the system is designed correctly you would not need an EPR valve on the evaporator because it will be designed to maintain that pressure so we can have that specific temperature. I hope this explains your question. If not please let me know. Thank you for watching!

[@ebbyt00]

Thanks, does it matter what kind of condenser air cooled or water cooled we have to decide about our subcool and also would it make a difference that we have very low or medium temp walking freezer to decide about our superheat

[@AirConAcademy]

No, it should not make a difference if it is air cold or water cold. The superheat will be the superheat that is required. What I mean is that if it is above freezing or below freezing the superheat will work the same. I just do not know what your temperatures are and what your superheat need it is. I have never worked on very low temperature freezers but it should all work the same. Thank you for watching I hope this helps.

[@ferozkhan9735]

Sir, your videos is knowledgeable, but I want to know that EPR evaporator pressure regular is going to close the area of EPR so that the gas is going to flow less and pressure is going to increase in evaporator coil that is all the idea but to buy EPR what details we have to check, if we want both same temperatures in two different box, so still we have to use EPR ( why because one box is going to reach the set temperature before then another.) Plz reply

[@AirConAcademy]

I am n ot sure I understand? It sounds like you are trying to add something onto an existing system? One of the main things you need to concentrate on, is if the compressor/unit can handle you adding another coil or box to it. It also sounds like you're trying to keep another box the same temperature. If that is the case, you can just adjust the EPR valve so they maintain basically the same temperature in each box. If you do need want the two to be at the same temperature you really do not need an APR valve. You only use that when you have two boxes from the same unit but different temperatures. I hope this makes sense. I tried to explain the best that I could what I thought you were asking. Good luck!

[@isacfernandes8101]

Thank, i from Brazil.

[@AirConAcademy]

Brazil!!??!?! Thank you!!!! glad you liked th3 video!!!

[@مهدیرمضانی-م1ف]

بسیار عالی 🙏🙏🙏🙏🙏🙏ok

[@AirConAcademy]

Thank you! And thank you for watching!

[@tuturututu2]

thank you, you make some awesome videos

[@AirConAcademy]

HA HA!!! Thank you!!!!! I am glad you like the videos!!!

[@patrickflynn3036]

How would you find the compressor inlet pressure if you already have the temperatures and pressures for 3 different boxes? Would you average out the temperatures and the find the corresponding pressure to that temperature?

[@AirConAcademy]

Thank you for writing!!! you should be able to get the actual suction pressure at the compressor. Look at the compressor inlet and there should be a port for you to get the suction pressure. You should have a semi-hermetic compressor so there should be a service valve that you may need to close a bit (Crack) so you can get the actual pressure. I hope this helped.

[@patrickflynn3036]

@@AirConAcademy This is actually for a Refrigeration Class and this is just like a project question so there isn't any physical components. I was given the all 3 box temperatures and it was stated that the compressor inlet had a superheat of 25 degrees Fahrenheit. I was able to figure out all of the pressures inside each box but I am confused if each box's refrigerant comes out of each EPR a different pressure and into the same compressor. Thanks for responding.

[@AirConAcademy]

@@patrickflynn3036 oh. I understand. It is for school. Averaging the pressures would not work because those are the pressures inside of the evaporator’s. I believe you said you had three evaporators? Do all evaporators have EPR valves? Because if one does not that would be your compressor suction pressure.

[@patrickflynn3036]

@@AirConAcademy Okay I understand. We basically have to design our own system and our professor did not give us much details about it so I will make only 2 of the evaporators have EPRs. Another question, would you rather have the evaporator with the highest pressure or the lowest pressure not have an EPR?.. since that would be the compressor suction pressure. Thank you.

[@AirConAcademy]

@@patrickflynn3036 It would have to be the evaporator with the lowest pressure. That way the two EPR valve that you have, or are going to have will be able to raise the pressure in the evaporator and release him into the suction as needed. So it would be the one with the lowest temperature/pressure. Good luck with your project!

[@jigs082]

Thank you sir🙂🙂🙂

[@AirConAcademy]

thank you and thank you for watching!!!

[@tantanbernal8244]

Really appreciated, tnx a lot sir!

[@AirConAcademy]

I am so glad you liked it. I hope to get more on here for you guys!!!

[@xavierchavez4859]

I’m actually trouble shooting an EPR valve at the moment in a coffin case supermarket. Air flow is good, fan is running but it’s pushing warm air. I’ve never trouble shot a EPR valve, any tips? I’m confident system is low on charge due to sight glass flashing but I would like to hear any advice. Thank you for the cool vids!

[@AirConAcademy]

My suggestion would be to try to clear the sight glass to attempt to get the charge close to what it should be, but this may not do it. Most of the time to make sure the charge is correct, the refrigerant is recovered, a vacuum is pulled and the unit is charged by weight! This way you know for sure the charge is correct and then you can properly trouble shoot the unit. If the charge is NOT correct you will not be able to trouble shoot the unit properly. It may be more work but it can save you time in the long run. I hope this helps.

[@xavierchavez4859]

Aircon Academy the fact that you responded is highly appreciated! Thank you for the knowledge gems. I charged 48lbs of R404a to the system and it’s now and temp but I know this is just putting a band aid to what I’m sure is probably a leak. Grocery stores, they love cutting cost and corners lol

[@AirConAcademy]

@@xavierchavez4859 I try to help yo guys so I try to respond. have you looked i to getting some of those leak seal additives? some guys have had luck with them. But it sounds like yo may need to use quite a bit if the unit uses that much refrigerant. good luck.

[@ivanestrada3468]

Thank you sir !! What is the difference from a EPR and a CPR valve (crankcase pressure regulator)?

[@AirConAcademy]

one controls the pressure in the crankcase of the compressor(CPR) and the EPR controls the pressure in the evaporator. take a look I have a video that explains each one of them.

[@AirConAcademy]

Thank you Very much!!!

[@ivanestrada3468]

@@AirConAcademy awesome. Thanks again 💪😎

[@REFEREEMOUSE]

Great and informative video, I am really happy to come across your channel and get refreshed on some of the things I train on...question, there is a port there, what pressure should be at that port? In you example at 4:11 the port is on the coil side, what is the pressure that should be there? Is it evap pressure? Second question, in this case we would have a solenoid at each box? I don’t deal w/ low temp or refrigeration but this is a cool refresher.

[@AirConAcademy]

I am so glad you like my channel!!! the pressure before the valve is going to be 68PSIG and after the valve it will be 32PSIG. there is no need to have a solenoid valve because the pressure inside the evaporator will be maintained as needed by the EPR valves. IF you had a solenoid it would be before the TXV/Metering Device to isolate the evaporator. but not really needed in this application. Thank you for your question!!!

[@REFEREEMOUSE]

Aircon Academy got it! Thanks!!

[@mohammedahmadou9317]

Thank you for this video it help a lot can post a video explain how the EPR valve working what happen inside the EPR? Thank you

[@michaelnoblehvac]

11 year tech here, Have a question about a head pressure valve I'm not familiar with, could you help?

[@AirConAcademy]

When you get a chance, send me the question. I will see what I can do to help you out!

[@jhuh1758]

Excellent

[@AirConAcademy]

Thank you!!!

[@frenchbulldawg]

Long shot here. Can you make a video that explains the basic components of a home HVAC broke down for us home owners. Please

[@AirConAcademy]

Thank you for the request but if you look on the videos that our house I believe that I already have one that you could look at. I explained the split system refrigeration cycle. kzbin.info/www/bejne/jIjNdqCeeMp2mrc try this link

[@Firebat15]

i'm here watching your videos again this year, now im in 4th year school instead of 3rd. Still wondering if you learnt how to write backwards or if you are using camera tricks haha

[@AirConAcademy]

ha ha ha I started off riding backwards. But I found it faster and my penmanship was nicer if I wrote the regular way and flipped the video. When I was in school I was bored with the material, it was not challenging at all so I would sit in the back of the classroom and one day I realized I could write backwards. One time I turned my paperwork in to the teacher and it was all written backwards, of course she did not appreciate that and got mad at me. Like I said school was boring but when I went into the Navy I found the material interesting and up to this day I cannot get enough learning of how things work. "Thank you for your question and I hope to have some new videos up here soon. I have been trying to get some courses online so that has taken up some of my time plus of course work.

[@jeffklein56]

How do you adjust an epr valve

[@AirConAcademy]

That is a little tricky. You need to make sure that you know what the temperature is that you want and what the pressure for the temperature needs to be. You need to check with the PT chart and adjust the EPR valve for that pressure so you can maintain the desired temperature. It is a little tricky to do as long as you take your time check your pressure and temperatures you should be able to do it. Good luck!

[@carlosrmejia5588]

excellent video tanks

[@chrisnorris1959]

Nice job! Thanks!

[@mividaloca7975]

What are some issues an epr valve may have .

[@AirConAcademy]

Mostly is not enough airflow!!! sometimes the filter if it is an AIrconditioning unit will stop the flow. Other times it could be the fan is not operating correctly. If the metering device is over or under feeding refrigerant to the evaporator it could be misdiagnosed as an evaporator problem.

[@mividaloca7975]

@@AirConAcademy how would you troubleshoot these issues

[@AirConAcademy]

@@mividaloca7975 if it is an AC unit then you would look at the filter, look at dampers through out the building, measure the airflow and figure out if it is enough according to the size of the unit . if it is a refrigerator you would just look at the fan to see if it is working. the metering device you would check to see what the super heat is. I cannot just give you a simple fix. it takes a lot of troubleshooting of the unit.

[@mividaloca7975]

@@AirConAcademy cool thanks

[@mohamedalsaidi2643]

Thank you for another great lecture. I have a question. Can we use EPR on a walking cooler that has three separate evaporators?

[@AirConAcademy]

yes but they are used to maintain the evaporators at separate or different temperatures then the others, or in other words at a higher temperature then the one with out the EPR valve.

[@mohamedalsaidi2643]

Thank you for answering my question. I appreciate the knowledge you sharing with us.

[@kyberking]

Just set individual tstats in return and dial them in , perfect if you have heavy traffic in an area of the cooler/freezers or long blast chillers/frzrs, a bit of work setting up valves but badass🤙

[@luisromero851]

EPR = just en refrigeracion? ?? Is there EPR in AC residential or heatpump ???

[@AirConAcademy]

I have only seen them in refrigeration and never in a heatpump.

[@ourfuturerefrigeration675]

thank you for a great lecture, btw, are you really writing with both hands and writing backwards?????

[@AirConAcademy]

Quality Refrigeration Equipment ha ha. Yes I can write with both hands and I can write backwards. I found out in elementary school I could and it is fun to do.

[@AirConAcademy]

In these videos I usually make it

[@AirConAcademy]

To make it faster I flip the video.

[@patch1753]

Couldn't the expansion valve serve the same purpose?

[@salvatoreaccorinti6703]

thank you

[@lottiekanta7271]

That is great but have a question. Can the EPR be replaced bt the suction heat exchanger the one in which the vessel has both liquid line and suction line going through.

[@jeffklein56]

Thank you

[@AirConAcademy]

Thank you and thank you for watching!