New HVAC student here, thanking you for sharing all that knowledge. I spent hours watching videos about AC and found out that just few channels are worthwhile ...yours is one of them. Keep up the good work!
@@AirConAcademy Hello. I enjoy your videos. Thank you for sharing your knowledge. Would you plz make video and explain the lock out relay. I only found one good video by grayfurnace. Thank you again.
Thank you for the kind words! And thank you for the idea! I never thought about wearing a white T-shirt. I have noticed that the writing is hard to see because of the different color shirts that I wear. But it white one would work out great! Thank you! And thank you for watching!
Thank you! I enjoy teaching and thought that this would help the new guys learn some material and it would be a good review for the experienced guys. I'm glad you liked it!
Thank you for your question, typically only the two lines going from the outdoor unit to the indoor unit are flushed. The receiver would be next to impossible to flush. Most of the time they should be replaced, along with the accumulator. For both of these. If you wanted to flush them out it would take a bit of work because they would have to be removed from the lines and the cleaning agent poured in to them, then agitate the mixture inside of them enough to get them to remove the oil from the walls and then you would have to try to get all of that cleaning agent along with the oil it has clean from the walls to come out of these components. I am just not sure if you would be able to get everything out of there. It would probably be best to remove and replace these components. I hope this answers your question. And thank you for watching.
I could do a video on that but most people do not deal with screw compressors because they are on large chillers and typically contractors that have gone to school will work on those. But let me see what I can do! Thank you for watching!
Like your videos, I was wondering if you put a video on hot gas defrost on a rack refrigeration system for commercial with a system with 4 compressors. With the accessories like ori liquid headers and suction headers. Thanks
I just made a note of that. Unfortunately I have so many classes going on right now and trying to get classes online on my Webpage. But I did make a note of it and as soon as I get a chance I will see if I can make a video on that! Thank you for your suggestion!
Hi there, can we also argue that the purpose of the receiver is to store liquid refrigerant and protect the compressor against liquid backflow in the event of system shutdown?
You could say that! BUT remember on shut down, the refrigerant will be in the Saturated state, meaning it will be liquid and vapor through out the system. So whatever is between the receiver and the compressor will have some liquid in it. On start up, the pressure will drop and will start to boil the liquid. so because of this the danger of liquid coming back will be minimal. IF this is a pump down system then there should not be any liquid between the receiver and the compressor. I hope this makes sense. Thank you for watching!!!
Sir I want to know how to calculate the total amount of refrigerant in one ton of unit so that I will fix the receiver size on unit (low temperatures unit around 7.5 ton)
Hi again! This is another tough question. The total amount of refrigerant typically has to do with the size and the length of the liquid and the suction line. The longer they are the more refrigerant you're going to need in the system. I tried sending you a chart, but I could not attach it to these messages. So I'm sending you a link that will explain approximately how much refrigerant you need per foot of refrigerant. www.acservicetech.com/refrigerant-weights I am not sure how much refrigerant your system house at the moment. But remember the receiver should hold the entire charge +20% more. So if your system holds 10 pounds, your receiver should hold a minimum of 12 pounds. If it is bigger, it is OK. It is not going to create any problems. I hope this helps! Good luck! And thank you for watching!
Hello sir , Thank you for a great video. I have two questions, First is, i want to install a 6kg liquid receiver , how mutch more gas need to charge in a system if without receiver it take 2.8kg R404a. And second is, can we connect equalizer port of a TXV valve to inlet port of liquid receiver to drawn excess refrigerant in the receiver instead of suction line. Again thank you sir for valuable talk.
Thank you for watching and for sending the question in. The first question, about the receiver is kind of tough to answer. The receiver it should be designed to hold the entire charge of the system plus another 20%. So if your system holds 10 pounds of refrigerant (here in the US we use pounds) your receiver should be able to hold 12 pounds of refrigerant. I would add another 3 to 5% of the charge on to the system to make sure that I have a good level in the receiver. So as the level increases and decreases in the receiver there will be enough in there to make sure you get 100% liquid going to the metering device. Ask for your second question. No. You cannot Connect the equalizer port of the TXV to the inlet port of the liquid receiver. The equalizer port is used to make sure the TXV maintains proper superheat so it must be connected to the outlet of the evaporator. If you connect it to the inlet of the receiver the TXV will not maintain proper superheat and most likely it will starve your evaporator. That will not work. I hope this answers your question please let me know if you still have other questions. Thank you for watching and I am glad you liked video!
Thank you very much for your comment. There is no real way to find out how much refrigerant is in the receiver. The level with rise and it will fall depending on what the metering device needs. Sometimes you might get lucky and you could take a temperature reading to see if the liquid is a different temperature than the vapor but there is no guarantee and most likely that might not work depending on what the system is doing. Sorry I could not give you a better answer.
ohhhhh that should NOT be that much of a problem. Typically the receiver is going to have a dip tube that reaches to the bottom. Because of this the oil should not settle at the bottom of the receiver, it should be pulled out with the refrigerant. This is why it is very important to install the receiver in the proper direction of flow. Another reason that the oil would not stay in the receiver is because the oil will mix with the refrigerant. This is why it is so important to use the proper oil with the proper refrigerant. For example you must use POE oil with 410 a refrigerant. If you were to use alkylbenzene or mineral base oil, the oil and the refrigerant would not mix like they should. Oil could be left in the receiver because of this. I hope this answers your question. Thank you for sending it in and thank you for watching!
Very helpful ..I am watching most of the videos..The way you explain is amazing. Can you share a video which explains change over from one ref unit to another which are in parallel. ( One unit is having refrigerant)
Thank you for your comment. Could you please explain to me a little more as to what it is he would like to see? I'm not quite sure I understand your request. I'm sorry and hope to hear back from you.
That actually is not a problem. I have seen several units that are not pump down systems and they have a liquid line receiver installed. One of the reasons they do this is because of the long suction and liquid lines that are needed in the system, and because the unit uses a TXV as a metering device. So, if that is what you need to do do not hesitate. Good luck out there!
interesting?! are you having this problem? How do you know you a pressure drop? There should not be anything before the receiver, except the service valve so you may want to check that valve if you are having that problem. Sometimes the King valve is attached to the receiver so that valve could be partially closed? Sometimes the Liquid line filter drier is right after the receiver so if you have a clogged liquid line filter drier, that could cause the pressure drop. Not sure if this helps if you are having this problem.
@@AirConAcademy we are using pressure transducer to find the pressure drop btw receiver inlet and outlet. (i.e., condensor-> pressure transducer->receiver tank->pressure transducer), but due to the arrangement of the components and pipes we use the king valve as an outlet instead of an inlet, yes the king valve is attached to the receiver tank., BUT do you think swapping the inlet and outlet will cause this issue, currently we are trying to resolve it by increasing the adapter dimensions Thanks for your reply.
@@NareshKumar-od2ki typically the receiver has an inlet and an outlet. The outlet has a dip tube that goes to the bottom of the receiver. If the inlet and outlet are reversed you will be pulling Gas out and not liquid. The pressure should stay the same but you will only be pulling Gas out. It should be worth while reversing it and see if that takes care of it. It may be a lot of work but you could take the receiver completely out temporarily to see if that solves your problem. You could have some trash and or dirt in the receiver which is causing the line to plug up inside the receiver.
@@AirConAcademy thanks for the reply, sorry for my misunderstanding. what u said was right, in our project the outlet has a dip tube and its only taking the refrigerant liquid out. we installed a pressure transducer and sight glass at the outlet of receiver. sometimes we do see some vapor bubbles on the sight glass and we had a pressure drop problem in our system, when we try to find the pressure drop on each component we come to know the receiver tank has the big pressure drop.
Good afternoon, why does it need to hold the entire refrigerant charge? Let's say my heat pump doesn't do pump down cycles, it's an air-to-air type, with evaporator and condenser with the same volume, shouldn't the receiver be able to fit the difference between: a. When the most refrigerant is needed b. When the least refrigerant is needed ? Thank you
Receivers are often used on systems that have long runs to ensure that the TXV has plenty of liquid going to it. Because of that they always suggest that if a pumpdown is needs to be done that the charge will fit in the receiver. Yes, he does need to sit into it the most amount of refrigerant while the unit is running and the least amount while the unit is running but they foresee us as technicians having to do a pop down system and with this we do not need to recover the refrigerant. If we use a smaller or larger receiver the unit should still function properly but to ensure proper operation you need a receiver that can hold the charge plus approximately 10 to 20% more. That is what I suggested and that is typically what we try to follow out there. I hope this helps and thank you for your question.
Thanks for this video your explanation is simple and easy to understand. Just a question what would suggest to use in order to flush out a system? Is N2 enough? Thanks
Nitrogen is only going to push some of the dirt out and not really get the oil or contaminants. They sell different types of flushing agents. There's one called Rx 11 and there's another one called pro flush. I don't know where you are, but supply houses here, just outside of Washington DC those are two that they sell. I normally use the pro flush it seems to work well for me. I hope this helps and thank you for watching!!!
Thank you for the good topics. I have a question, if the evaporator is 100ft from the receiver, where is the best place to install the solenoid, just after the receiver, i.e. in the compressor area, easier to inspect, or just before the evaporator, too far for inspection. Please explain, and why if it matters.
ABC Very good question! If you are going to add a solenoid valve. You would want to add it just before the metering device. Reason for that is that when the solenoid opens you want a full column of liquid going to the metering device as soon as possible. That will increase the efficiency of the unit. Don’t forget if you do this you will have to have a low pressure switch to turn the compressor off when the system pumps down. And the thermostat is going to be energizing and deenergizing the solenoid valve in order to have cooling in the house and or space. I think I need to do a video on a pump down System. There is a lot to explain in a lot to go over. But I hope this helped let me know if you have other questions.
Thank you for asking!!! I am in the middle of an on line class right now. I will be starting another one soon after this ends. Keep posted and you will see when we start the class. Thank you!!!
Actually the EPA wants to get rid of all feasible plugs. The main reason is when they blow all of the charge will be lost. A fusible plug will open when the temperature gets very high. The receiver should have a relief valve, which will reset when the pressure has dropped. Thank you for your question I hope this answers your question.
Sir just a question I see videos where they show a thermal imaging camera to check the level of liq.refrigerant in the receiver How does this work? And how much liquid should the receiver hold? Thanks.
That is an interesting way of doing it. The thermal imaging will show the level of the refrigerant in the receiver. This will tell you if you have enough refrigerant in the system. As for how much refrigerant should be in the receiver? it is hard to tell. Rule of thumb says that a receiver should hold the entire charge of the system plus 10 to 20% more of the entire charge. The units that use receivers typically use a TXV as a metering devise. As the TXV opens and closes because of load changes and the TXV allowing more and less refrigerant in to the evaporator the level in the receiver will change. I would say the that the receiver should be about 1/3 to 1/4 full under normal and a good heat load. This should be the close to the 10 to 20% of the above complete charge of the system. I hope this explains it to you.
Good question, the level in the receiver will fluctuate because of the heat load. The more, or the higher the heat load is the more refrigerant you will need in the evaporator. Other times when the heat load drops you need less refrigerant in the evaporator. Because of this the level in the receiver will fluctuate. This is why the receiver is used to store the extra refrigerant that is not needed at that moment. And to make sure that you have plenty of refrigerant when needed. I hope this explains your question. Good luck out there!
@@cryothunder328 yes, it sure is! Plus in this field you can make a lot of money! I know you can work on cars also but this is pretty good stuff! Good luck!
Dear Julio, I was going through one of your past explanations. Quite refreshing. Well I have a question. As per your explanation you said the receiver is going to store R22 at -40 degree Fahrenheit & R410A at -60 degree Fahrenheit. If that is the case don't you think the receiver is going to collect heat before reaching the metering device instead of after the metering device in the evaporator. Because the constriction in the metering device itself plays a role in lowering the temperature of the refrigerant, be it a TXV or a fixed metering device.
muntakim mosharraf ohhhhhh. I am so sorry, if that is what I said I did not mean to say that!!! The receiver is going to store the refrigerant at ambient temperature. The refrigerant because of that is going to stay sub cooled inside the receiver. R 22 when it comes out as a liquid into atmospheric pressure it comes out at 40 below zero. And refrigerant R410 A when it comes out to the atmosphere as a liquid it comes out at 60 below zero. I am sorry for the confusion. I hope the explanation above helped. Thank you
I just watched the video and I was talking about what happens if the pressure relief valve is placed too low on the receiver. the the refrigerant would come out as a liquid at those temperatures. sorry for the confusion.
Most systems will not have a receiver. Systems with TXV's and with a long line set are typically the ones that are using receivers. It is one of those things that it is an accessory it is a luxury so it is not needed. Most of the time you don't see receivers. Thank you for your question and thank you for watching.
very short, sweet, and simple ... thank you!
Thank you very much for your kind words! I'm glad you liked the video and thank you for watching!
New HVAC student here, thanking you for sharing all that knowledge. I spent hours watching videos about AC and found out that just few channels are worthwhile ...yours is one of them. Keep up the good work!
Thank you!!! I am glad you feel that way!! let me know if you have suggestions for videos
@@AirConAcademy
Hello. I enjoy your videos. Thank you for sharing your knowledge. Would you plz make video and explain the lock out relay. I only found one good video by grayfurnace. Thank you again.
Thanks..
Clear video. Thank You!!!
Thank you! Thank you for watching! I'm glad you liked the video!
this guy is so clear and easily understandable. explains very thoroughly yet short and simple. thank you
Thank you! I'm glad enjoy the video!
another simply explained component of some HVAC systems.
Great Job, Julio... Thank you very much!
Thank you so much! And thank you for watching!
You are so systematic and real world explanation! GREAT JOB!
Thank yo so much!!! I have been doing this since 1979 it has been a while and love this stuff. thank you for watching !!!!
Exceptional explanation! Thank you for the lesson!
Thank you so much. I'm glad you enjoyed it and thank you for watching!
You are great at explaining, thanks for sharing this information.
Thank you! And thank you for watching!
Thank you for video. Smart method to write on this type of board, also you can improve it by wearing white T-shirt. Thanks for great explanation!
Thank you for the kind words! And thank you for the idea! I never thought about wearing a white T-shirt. I have noticed that the writing is hard to see because of the different color shirts that I wear. But it white one would work out great! Thank you! And thank you for watching!
Do a video for a receiver heater with klixon
ohh thank you for your suggestion! I will see if I can make some time and do that! Thank you and thank you for watching!
Being a hvac engineer, i like the way you teach.
And very informative though short video.
Thank you! I enjoy teaching and thought that this would help the new guys learn some material and it would be a good review for the experienced guys. I'm glad you liked it!
very good explanation 👍
thank you and thank you for watching!!!
Great videos thanks
thank you and thank you for watching!
Simply Smarly and very Professionally Explained.
Best Channel i've seen so far :)
Remarkable !
Thank you!!! I hope it helps and glad you like it. any suggestions let me know!!!
@@AirConAcademy Your all content is soo helpful very easy to learn.i have a suggestion for brazed plate heat exchangers in chillers.Thankyou
Great explanation Julio, cheers!
Thank you so much! I'm glad you liked it and thank you for watching!
Keep up the way you explain so beautiful (very special ). Thank you
Thank you!!!! I will keep doing more for guys like you!!!!
Thank you.
Thank you! I'm glad you like the video and thank you for watching!
gifted teacher !
Thank you so much!!!!
thank you so much sir and please help me how to do the proper flushing to the whole system it will helpful for my work
Thank you for your question, typically only the two lines going from the outdoor unit to the indoor unit are flushed. The receiver would be next to impossible to flush. Most of the time they should be replaced, along with the accumulator. For both of these. If you wanted to flush them out it would take a bit of work because they would have to be removed from the lines and the cleaning agent poured in to them, then agitate the mixture inside of them enough to get them to remove the oil from the walls and then you would have to try to get all of that cleaning agent along with the oil it has clean from the walls to come out of these components. I am just not sure if you would be able to get everything out of there. It would probably be best to remove and replace these components. I hope this answers your question. And thank you for watching.
Thank you Julio for your teaching stay safe God bless.
thank you!!!! glad you liked the video!!!!
Is it possible to talk about screw compressor mechanical parts failures
I could do a video on that but most people do not deal with screw compressors because they are on large chillers and typically contractors that have gone to school will work on those. But let me see what I can do! Thank you for watching!
Like your videos, I was wondering if you put a video on hot gas defrost on a rack refrigeration system for commercial with a system with 4 compressors. With the accessories like ori liquid headers and suction headers.
Thanks
I just made a note of that. Unfortunately I have so many classes going on right now and trying to get classes online on my Webpage. But I did make a note of it and as soon as I get a chance I will see if I can make a video on that! Thank you for your suggestion!
Thank you for sharing your knowledge,
Thank you for watching and tell your friends when possible!!!
Better teacher than my instructor
Thanx a lot!
Thank you and thank you for watching!
Hi there, can we also argue that the purpose of the receiver is to store liquid refrigerant and protect the compressor against liquid backflow in the event of system shutdown?
You could say that! BUT remember on shut down, the refrigerant will be in the Saturated state, meaning it will be liquid and vapor through out the system. So whatever is between the receiver and the compressor will have some liquid in it. On start up, the pressure will drop and will start to boil the liquid. so because of this the danger of liquid coming back will be minimal. IF this is a pump down system then there should not be any liquid between the receiver and the compressor. I hope this makes sense. Thank you for watching!!!
Tnx a lot sir julio for the great knowledgeble video!
Thank you!!!
Sir I want to know how to calculate the total amount of refrigerant in one ton of unit so that I will fix the receiver size on unit (low temperatures unit around 7.5 ton)
Hi again! This is another tough question. The total amount of refrigerant typically has to do with the size and the length of the liquid and the suction line. The longer they are the more refrigerant you're going to need in the system. I tried sending you a chart, but I could not attach it to these messages. So I'm sending you a link that will explain approximately how much refrigerant you need per foot of refrigerant.
www.acservicetech.com/refrigerant-weights
I am not sure how much refrigerant your system house at the moment. But remember the receiver should hold the entire charge +20% more. So if your system holds 10 pounds, your receiver should hold a minimum of 12 pounds. If it is bigger, it is OK. It is not going to create any problems. I hope this helps! Good luck! And thank you for watching!
Hello sir , Thank you for a great video.
I have two questions,
First is, i want to install a 6kg liquid receiver , how mutch more gas need to charge in a system if without receiver it take 2.8kg R404a. And second is, can we connect equalizer port of a TXV valve to inlet port of liquid receiver to drawn excess refrigerant in the receiver instead of suction line.
Again thank you sir for valuable talk.
Thank you for watching and for sending the question in. The first question, about the receiver is kind of tough to answer. The receiver it should be designed to hold the entire charge of the system plus another 20%. So if your system holds 10 pounds of refrigerant (here in the US we use pounds) your receiver should be able to hold 12 pounds of refrigerant. I would add another 3 to 5% of the charge on to the system to make sure that I have a good level in the receiver. So as the level increases and decreases in the receiver there will be enough in there to make sure you get 100% liquid going to the metering device. Ask for your second question. No. You cannot Connect the equalizer port of the TXV to the inlet port of the liquid receiver. The equalizer port is used to make sure the TXV maintains proper superheat so it must be connected to the outlet of the evaporator. If you connect it to the inlet of the receiver the TXV will not maintain proper superheat and most likely it will starve your evaporator. That will not work. I hope this answers your question please let me know if you still have other questions. Thank you for watching and I am glad you liked video!
thanks a lot keep going , you are a great man .
Is there a way to figure out how much refrigerant inside the receiver ?
Thanks again
Thank you very much for your comment. There is no real way to find out how much refrigerant is in the receiver. The level with rise and it will fall depending on what the metering device needs. Sometimes you might get lucky and you could take a temperature reading to see if the liquid is a different temperature than the vapor but there is no guarantee and most likely that might not work depending on what the system is doing. Sorry I could not give you a better answer.
@@AirConAcademy thanks for your fast respond. I appreciate it
How to make sure oil not to get trapped in the receiver? How to insure it get back to compressor?
ohhhhh that should NOT be that much of a problem. Typically the receiver is going to have a dip tube that reaches to the bottom. Because of this the oil should not settle at the bottom of the receiver, it should be pulled out with the refrigerant. This is why it is very important to install the receiver in the proper direction of flow. Another reason that the oil would not stay in the receiver is because the oil will mix with the refrigerant. This is why it is so important to use the proper oil with the proper refrigerant. For example you must use POE oil with 410 a refrigerant. If you were to use alkylbenzene or mineral base oil, the oil and the refrigerant would not mix like they should. Oil could be left in the receiver because of this. I hope this answers your question. Thank you for sending it in and thank you for watching!
@@AirConAcademy
Thanks
I read about a component called “oil separator”.
Do you have video describing its operation and principle?
Thanks again
Very helpful ..I am watching most of the videos..The way you explain is amazing. Can you share a video which explains change over from one ref unit to another which are in parallel. ( One unit is having refrigerant)
Thank you for your comment. Could you please explain to me a little more as to what it is he would like to see? I'm not quite sure I understand your request. I'm sorry and hope to hear back from you.
Hi howzit can i install liquid receiver in a non pump down system
That actually is not a problem. I have seen several units that are not pump down systems and they have a liquid line receiver installed. One of the reasons they do this is because of the long suction and liquid lines that are needed in the system, and because the unit uses a TXV as a metering device. So, if that is what you need to do do not hesitate. Good luck out there!
what if there is a big pressure drop before receiver inlet and outlet.... would be the first thing comes to your mind
interesting?! are you having this problem? How do you know you a pressure drop? There should not be anything before the receiver, except the service valve so you may want to check that valve if you are having that problem. Sometimes the King valve is attached to the receiver so that valve could be partially closed? Sometimes the Liquid line filter drier is right after the receiver so if you have a clogged liquid line filter drier, that could cause the pressure drop. Not sure if this helps if you are having this problem.
@@AirConAcademy we are using pressure transducer to find the pressure drop btw receiver inlet and outlet. (i.e., condensor-> pressure transducer->receiver tank->pressure transducer), but due to the arrangement of the components and pipes we use the king valve as an outlet instead of an inlet, yes the king valve is attached to the receiver tank.,
BUT do you think swapping the inlet and outlet will cause this issue, currently we are trying to resolve it by increasing the adapter dimensions
Thanks for your reply.
@@NareshKumar-od2ki typically the receiver has an inlet and an outlet. The outlet has a dip tube that goes to the bottom of the receiver. If the inlet and outlet are reversed you will be pulling Gas out and not liquid. The pressure should stay the same but you will only be pulling Gas out. It should be worth while reversing it and see if that takes care of it. It may be a lot of work but you could take the receiver completely out temporarily to see if that solves your problem. You could have some trash and or dirt in the receiver which is causing the line to plug up inside the receiver.
@@AirConAcademy thanks for the reply, sorry for my misunderstanding. what u said was right, in our project the outlet has a dip tube and its only taking the refrigerant liquid out. we installed a pressure transducer and sight glass at the outlet of receiver. sometimes we do see some vapor bubbles on the sight glass and we had a pressure drop problem in our system, when we try to find the pressure drop on each component we come to know the receiver tank has the big pressure drop.
@@NareshKumar-od2ki I hope you get it resolved. I think there is foreign material in the receiver giving ho he pressure drop.
Good afternoon, why does it need to hold the entire refrigerant charge? Let's say my heat pump doesn't do pump down cycles, it's an air-to-air type, with evaporator and condenser with the same volume, shouldn't the receiver be able to fit the difference between:
a. When the most refrigerant is needed
b. When the least refrigerant is needed
?
Thank you
Receivers are often used on systems that have long runs to ensure that the TXV has plenty of liquid going to it. Because of that they always suggest that if a pumpdown is needs to be done that the charge will fit in the receiver. Yes, he does need to sit into it the most amount of refrigerant while the unit is running and the least amount while the unit is running but they foresee us as technicians having to do a pop down system and with this we do not need to recover the refrigerant. If we use a smaller or larger receiver the unit should still function properly but to ensure proper operation you need a receiver that can hold the charge plus approximately 10 to 20% more. That is what I suggested and that is typically what we try to follow out there. I hope this helps and thank you for your question.
@@AirConAcademy thank you for the answer!
Thanks for this video your explanation is simple and easy to understand. Just a question what would suggest to use in order to flush out a system? Is N2 enough? Thanks
Nitrogen is only going to push some of the dirt out and not really get the oil or contaminants. They sell different types of flushing agents. There's one called Rx 11 and there's another one called pro flush. I don't know where you are, but supply houses here, just outside of Washington DC those are two that they sell. I normally use the pro flush it seems to work well for me. I hope this helps and thank you for watching!!!
Thanks a lot, the question is how to identify them in late and out late the thank
usually they are labeled inlet and outlet
@@AirConAcademy Thanks a lot.
Thank you for the good topics. I have a question, if the evaporator is 100ft from the receiver, where is the best place to install the solenoid, just after the receiver, i.e. in the compressor area, easier to inspect, or just before the evaporator, too far for inspection. Please explain, and why if it matters.
ABC Very good question! If you are going to add a solenoid valve. You would want to add it just before the metering device. Reason for that is that when the solenoid opens you want a full column of liquid going to the metering device as soon as possible. That will increase the efficiency of the unit. Don’t forget if you do this you will have to have a low pressure switch to turn the compressor off when the system pumps down. And the thermostat is going to be energizing and deenergizing the solenoid valve in order to have cooling in the house and or space. I think I need to do a video on a pump down System. There is a lot to explain in a lot to go over. But I hope this helped let me know if you have other questions.
@@AirConAcademy clear, thank you.
So its "purpose" is to assist in pump downs?
Do you schedule..how much to pay.
Thank you for asking!!! I am in the middle of an on line class right now. I will be starting another one soon after this ends. Keep posted and you will see when we start the class. Thank you!!!
I thought fusible plugs are on the receiver?
Actually the EPA wants to get rid of all feasible plugs. The main reason is when they blow all of the charge will be lost. A fusible plug will open when the temperature gets very high. The receiver should have a relief valve, which will reset when the pressure has dropped. Thank you for your question I hope this answers your question.
Thank you for the quick reply. Appreciate the knowledge. 👍
Very helpful. Thanx alot
Thank you!!! I am glad I can help!!!
Sir just a question I see videos where they show a thermal imaging camera to check the level of liq.refrigerant in the receiver How does this work? And how much liquid should the receiver hold? Thanks.
That is an interesting way of doing it. The thermal imaging will show the level of the refrigerant in the receiver. This will tell you if you have enough refrigerant in the system. As for how much refrigerant should be in the receiver? it is hard to tell. Rule of thumb says that a receiver should hold the entire charge of the system plus 10 to 20% more of the entire charge. The units that use receivers typically use a TXV as a metering devise. As the TXV opens and closes because of load changes and the TXV allowing more and less refrigerant in to the evaporator the level in the receiver will change. I would say the that the receiver should be about 1/3 to 1/4 full under normal and a good heat load. This should be the close to the 10 to 20% of the above complete charge of the system. I hope this explains it to you.
Why would the ac system need to fluctuate in oil use? why can’t they just fill up the system to spec and then leave it like other ac systems?
Good question, the level in the receiver will fluctuate because of the heat load. The more, or the higher the heat load is the more refrigerant you will need in the evaporator. Other times when the heat load drops you need less refrigerant in the evaporator. Because of this the level in the receiver will fluctuate. This is why the receiver is used to store the extra refrigerant that is not needed at that moment. And to make sure that you have plenty of refrigerant when needed. I hope this explains your question. Good luck out there!
@@AirConAcademy thanks for the information I’m mainly a car guy but this stuff is pretty interesting to learn about 😁
@@cryothunder328 yes, it sure is! Plus in this field you can make a lot of money! I know you can work on cars also but this is pretty good stuff! Good luck!
Dear Julio, I was going through one of your past explanations. Quite refreshing. Well I have a question.
As per your explanation you said the receiver is going to store R22 at -40 degree Fahrenheit & R410A at -60 degree Fahrenheit.
If that is the case don't you think the receiver is going to collect heat before reaching the metering device instead of after the metering device in the evaporator.
Because the constriction in the metering device itself plays a role in lowering the temperature of the refrigerant, be it a TXV or a fixed metering device.
muntakim mosharraf ohhhhhh. I am so sorry, if that is what I said I did not mean to say that!!! The receiver is going to store the refrigerant at ambient temperature. The refrigerant because of that is going to stay sub cooled inside the receiver. R 22 when it comes out as a liquid into atmospheric pressure it comes out at 40 below zero. And refrigerant R410 A when it comes out to the atmosphere as a liquid it comes out at 60 below zero. I am sorry for the confusion. I hope the explanation above helped. Thank you
I just watched the video and I was talking about what happens if the pressure relief valve is placed too low on the receiver. the the refrigerant would come out as a liquid at those temperatures. sorry for the confusion.
Thank you so much
Look at this.... lol it's my old teacher lol 😆
Ha ha! Yes! I saw your name and remember you! Thank you for watching! I hope you like the video!
perfect❤❤❤
Thank you very much, and thank you for watching!
Why don’t all systems have a receiver. The residential systems I see don’t have one.
Most systems will not have a receiver. Systems with TXV's and with a long line set are typically the ones that are using receivers. It is one of those things that it is an accessory it is a luxury so it is not needed. Most of the time you don't see receivers. Thank you for your question and thank you for watching.
Thank you for clearing that up for me.
Thank you sir...
Thanks
Thank you sir