Thank you so much! You have no idea how much I appreciate your comments! Thank you for watching and I hope to get some more videos on here soon for you guys!
@@AirConAcademy I just discovered ur channel watched and learnt things fast ....i like when it s plainly explained slowly clearly and the way you simplify we did not have teachers like that....they were good but visualized like this it is great thx a lot I m from Canada
@@soleilsoleil8287 thank you so much for your comments! those are very kind words. Yes, I like to teach so I enjoy doing this for you guys. Thank you for watching!!!
This really only works for the reciprocating compressor, which has the suction and discharge valves. On a rotary compressor there are no valves. It draws the refrigerant in from one side and acid rotates a compress it and pushes it out on the other side. So you really do not have suction and discharge valves, like you do have on the reciprocating compressor. I hope this answers your question. And thank you for watching!
Correct! The closest valve to isolate the compressor is the suction line service valve on the unit. So you can use that valve to check the pressure/valves but you will need an access fitting after the suction line service valve.
My great Master I really appreciate you so much for taking your time to teach us all we need to know about the HVAC system God bless you sir, pls help me do video on how to check tonage of sermihermetic compressor sir
Thank you so much for your comment! I have made a note of it and I hope I can get to these videos soon! I have been busy making up some classes to post on my webpage airconacademy.com. But I will see what I can do with it! Thank you for watching!
One of the nice things about the Scroll compressors is that they do not have suction or discharge valves. Because of that, there are no valves that can fail and even if liquid gets into the scrolls, the compressor will push it right on through. This video was to test the suction and discharge valves but since Scroll compresses do not have suction of discharge valve, it doesn't really apply to a Scroll compressor. Thank you for watching!
If we are talking about the same thing. That is so you can set the unit an emergency/cooling to help you pump the system down when you need to work on the system.. These units do not have a contactor you can push in to pump the system down. I hope this answers your question.
I'm interested in rewinding and rebuilding air conditioning compressor hermetic and semi-hermetic compressor...where do you think I can find the spare parts ..
That can be a little tricky. He would have to deal with the manufacturer and that may be a closed loop. They may not want to sell to just anyone. You can always contact copeland compressors for example or maybe Carlyle and see about buying parts see what their requirements are. Good luck finding the correct phone number and person to talk to. Like anything else it will be hard getting started but if you stick to it you should be able to do it!
Thanks for the tip on how check valves. I think the 65psig & 220psig you mentioned are related to air conditioning systems. Can you please give the optimum pressures for R22 in refrigeration systems for -18C degrees box temp and for +4C box temp.
Yes! Those pressures are specifically for air conditioning but when we're dealing with very cold boxes like you mentioned -18C you looking at a suction pressure of approximately 24PSIG. And for four Celsius, you're looking at a suction pressure of approximately 67. PSIG. What I did was to use my PT chart to see what the temperature he wanted to have converts to. The pressures I am giving you is the saturation temperature at -18 Celsius, and at +4C Celsius. I I'm not sure if this is what you were asking, but I hope this helps!
Great Tutorial!!! I understand that On residential split ACs you do not want your evaporator coil to run below 32° freezing mark but can you kindly explain why in the video you mentioned you want your evaporator temperature to be around 40°F and then that same clip you mentioned the high side pressure’s thank you very much
Thank you for your question! Some engineer somewhere has decided tha 40 degrees is the ideal temperature for the evaporator. So in the industry we try to stay around 40 degrees. it is a good temperature where we are not too close to 32 and still low enough that we have good heat transfer. on the high side, it is important because we need to maintain the the pressure high enough so we can condense it in the high outside air temperature. BUT NOT too high where the compressor works too hard.
Thank you for the question. If you want to change the oil in a semi-hermetic there is a plug that you can remove and drain the oil. IF you have a hermetic compressor then it is more difficult. You need to remove the compressor and turn it upside down in order to remove the compressor. it is a bit more difficult.
Thank you for the question! Unfortunately I do not have any on chillers at the moment. There are so many videos I want to make but while trying to do classes it is all kind of difficult to do. I am making a note of it and hopefully I can get some done on chillers! Thank you for the suggestion!
If you are asking about an air conditioning system? Your suction pressure for a 40° evaporator should be right around 86 PSIG the high side pressure could be as high as 260 or 270? But this is for air-conditioning I'm not sure what type of system you are working on. If you know the evaporator temperature then you can use your PT chart to see what your suction pressure should be. I hope this helps!
Hi, Here are some subjects that have I not seen covered in RUclips, and would be a nice addition if you could make clips about it, 1. Oil pressure switches wiring and principle of operations, 2. Oil separators at the discharge side, are they practical and useful? 3. Suction line accumulators, are they practical and useful? This is for refrigeration systems with R22, and semi hermetic compressors of around 20-30hp
I am so sorry! I just now saw your message because someone else commented on this video. Yes I will see if I can make a video on oil pressure switches, several of other guys have asked about that. Oil separators? Interesting not too many people ask or mention that. They are usually only use on low temperature systems and or refrigeration systems. For your typical air conditioning you don't really use oil separators. The accumulators are typically only used on heat pumps because of the switching from heating to cooling. The accumulator will keep that liquid refrigerant from getting back to the compressor. But if you have a system that uses a TXV, the TSV will maintain superheat and you should not have to worry about liquid coming back to the compressor. I hope this answers your question and again let me apologize for not getting back to you sooner!
Hey. Great vid as always. Question; you close the suction service valve only when testing the Compressor valves/performance ? I remember on a previous vid you said when you pump down to close off the high side to allow the com to suck all the refrigerant. But on this vid you said it is dangerous
Thank you for your comment and for watching the videos. I'm glad to hear that you like them. In the other video I was talking about pumping the system down. When you pop down you close of that liquid line service valve or the king valve. In that video I believe I was talking about closing off the liquid line service valve. When you do that you pull all of the refrigerant from the liquid line and from the evaporator and put it into the condenser and or the receiver. In this video I am talking about closing off the discharge valve. I am saying to not close the discharge valve because these compressors are positive displacement compressors and because of that something will break. So it is a little bit different than in the other video. I hope this answers your question. Again thank you very much and keep watching and keep learning!
Fesal Modi The metering device would still be placed on the indoor unit in a mini split if it is a straight AC unit. If it is a heat pump then you would still need one in 2 places. One inside and one outside.
Hi again Mr. Julio, thanks for continually sharing with us your knowledge sir. My experienced today with the car ac was that at idle it blows cool air, but when you accelerate or raised the rpm even up to 25 or 30, it stops cooling. And if you put the ac off and after 30 sec. you on it, it starts to cool again and thereafter repeat the same thing again when you accelerate. Any solution(s) sir? Thanks in advance, MOSES .
I am so sorry that I did not see your message until just now. I know it has been a year I hope you got your problem resolved. From reading your comments it sounds like he might have had a restriction in the system so when you increased the RPM there was not enough refrigerant going into the evaporator to do any cooling. I have seen this or something similar when there is a partial blockage at the strainer before the metering device. Again I am sorry I missed your message until just now I hope you have a problem resolved.
We have always replaced all of the valve plates. Sometimes you can hear the sound if you have a stethoscope. Other times you may have to inspect them one at a time. sorry I do not have a better answer.
I'm sorry, I just now saw your question. Just like I was explaining in the video. You close off the service valve to the compressor and see if the pressure will stay down or low and it will not come back up. If it is a residential unit it is a bit more difficult because all you have is the suction line service valve on the unit .
On smaller units 30 or 40 ton, compressors typically do not have rings. On larger units 75 ton on up the may have rings and if the rings fail the high side pressures would drop and the suction pressure will increase. You may also loose oil by pumping it out.
Hello Aircon academy, if the suction service valves are closed and even if the suction valve on the compressor is leaking, where is the pressure coming from then.
Julio is unique in his videos...thanks so much for sharing your videos
Thank you so much! You have no idea how much I appreciate your comments! Thank you for watching and I hope to get some more videos on here soon for you guys!
من یه فارسی زبانم و از زبان انگلیسی فقط چند کلمه تخصصی بلدم ولی کلیپ های شمارو دنبال میکنم بسیار عالی توضیح میدید مهندس ممنون از شما
I am sorry I wish I could understand what you are saying.
Great Pedagogy 😊
HA HA HA Thank you and thank you for watching!!!!
@@AirConAcademy I just discovered ur channel watched and learnt things fast ....i like when it s plainly explained slowly clearly and the way you simplify we did not have teachers like that....they were good but visualized like this it is great thx a lot I m from Canada
@@soleilsoleil8287 thank you so much for your comments! those are very kind words. Yes, I like to teach so I enjoy doing this for you guys. Thank you for watching!!!
Thank you 👍 sir you video so amazing
Thank you so much for the kind words and thank you for watching! I'm glad you like the videos!
Thank you Sir Julio, for sharing your kwnoledges. To check the rotary hermetic compressor can it be done in same way or is it another procedure
This really only works for the reciprocating compressor, which has the suction and discharge valves. On a rotary compressor there are no valves. It draws the refrigerant in from one side and acid rotates a compress it and pushes it out on the other side. So you really do not have suction and discharge valves, like you do have on the reciprocating compressor. I hope this answers your question. And thank you for watching!
Thank you Julio, much appreciated.
You're welcome! I'm glad you like the video! Keep watching and keep learning!
thank you sir.your teaching is very very clear as ur listener
Thank you so much! I'm glad you like the video! Please keep learning and be careful out there!
On a typical residential unit there won’t be a valve to isolate just the compressor. Right?
Correct! The closest valve to isolate the compressor is the suction line service valve on the unit. So you can use that valve to check the pressure/valves but you will need an access fitting after the suction line service valve.
thank you again..🙂
Thank you! And thank you for watching!
My great Master I really appreciate you so much for taking your time to teach us all we need to know about the HVAC system God bless you sir, pls help me do video on how to check tonage of sermihermetic compressor sir
Thank you so much for your comment! I have made a note of it and I hope I can get to these videos soon! I have been busy making up some classes to post on my webpage airconacademy.com. But I will see what I can do with it! Thank you for watching!
It's also applicable in scroll compressor?
One of the nice things about the Scroll compressors is that they do not have suction or discharge valves. Because of that, there are no valves that can fail and even if liquid gets into the scrolls, the compressor will push it right on through. This video was to test the suction and discharge valves but since Scroll compresses do not have suction of discharge valve, it doesn't really apply to a Scroll compressor. Thank you for watching!
Hi, could you please explain what is the purpose of emergency setting in daikin vrv system
If we are talking about the same thing. That is so you can set the unit an emergency/cooling to help you pump the system down when you need to work on the system.. These units do not have a contactor you can push in to pump the system down. I hope this answers your question.
I'm interested in rewinding and rebuilding air conditioning compressor hermetic and semi-hermetic compressor...where do you think I can find the spare parts ..
That can be a little tricky. He would have to deal with the manufacturer and that may be a closed loop. They may not want to sell to just anyone. You can always contact copeland compressors for example or maybe Carlyle and see about buying parts see what their requirements are. Good luck finding the correct phone number and person to talk to. Like anything else it will be hard getting started but if you stick to it you should be able to do it!
Thanks for the video very helpful
Grasias por tu tiempo en esplicar todo muy vien👍
Muchas gracias!!!!
Thanks for the tip on how check valves. I think the 65psig & 220psig you mentioned are related to air conditioning systems. Can you please give the optimum pressures for R22 in refrigeration systems for -18C degrees box temp and for +4C box temp.
Yes! Those pressures are specifically for air conditioning but when we're dealing with very cold boxes like you mentioned -18C you looking at a suction pressure of approximately 24PSIG. And for four Celsius, you're looking at a suction pressure of approximately 67. PSIG. What I did was to use my PT chart to see what the temperature he wanted to have converts to. The pressures I am giving you is the saturation temperature at -18 Celsius, and at +4C Celsius. I I'm not sure if this is what you were asking, but I hope this helps!
Great Tutorial!!! I understand that On residential split ACs you do not want your evaporator coil to run below 32° freezing mark but can you kindly explain why in the video you mentioned you want your evaporator temperature to be around 40°F and then that same clip you mentioned the high side pressure’s thank you very much
Thank you for your question! Some engineer somewhere has decided tha 40 degrees is the ideal temperature for the evaporator. So in the industry we try to stay around 40 degrees. it is a good temperature where we are not too close to 32 and still low enough that we have good heat transfer. on the high side, it is important because we need to maintain the the pressure high enough so we can condense it in the high outside air temperature. BUT NOT too high where the compressor works too hard.
Thanks for the training
Toyin Orodare Thank you, I’m glad you like the videos!
Great video,
I have a question how to change oil in old compressor
Thank you for the question. If you want to change the oil in a semi-hermetic there is a plug that you can remove and drain the oil. IF you have a hermetic compressor then it is more difficult. You need to remove the compressor and turn it upside down in order to remove the compressor. it is a bit more difficult.
@@AirConAcademy thank you so much for the answer
Last question can I just mix POE oil with mineral oil??????
Hey I was just wondering you had any training videos on Chiller systems? Thanks!
Thank you for the question! Unfortunately I do not have any on chillers at the moment. There are so many videos I want to make but while trying to do classes it is all kind of difficult to do. I am making a note of it and hopefully I can get some done on chillers! Thank you for the suggestion!
Sir,
For R404a gas what would be suction and discharge pressure
If you are asking about an air conditioning system? Your suction pressure for a 40° evaporator should be right around 86 PSIG the high side pressure could be as high as 260 or 270? But this is for air-conditioning I'm not sure what type of system you are working on. If you know the evaporator temperature then you can use your PT chart to see what your suction pressure should be. I hope this helps!
Hi, Here are some subjects that have I not seen covered in RUclips, and would be a nice addition if you could make clips about it, 1. Oil pressure switches wiring and principle of operations, 2. Oil separators at the discharge side, are they practical and useful? 3. Suction line accumulators, are they practical and useful? This is for refrigeration systems with R22, and semi hermetic compressors of around 20-30hp
I am so sorry! I just now saw your message because someone else commented on this video. Yes I will see if I can make a video on oil pressure switches, several of other guys have asked about that. Oil separators? Interesting not too many people ask or mention that. They are usually only use on low temperature systems and or refrigeration systems. For your typical air conditioning you don't really use oil separators. The accumulators are typically only used on heat pumps because of the switching from heating to cooling. The accumulator will keep that liquid refrigerant from getting back to the compressor. But if you have a system that uses a TXV, the TSV will maintain superheat and you should not have to worry about liquid coming back to the compressor. I hope this answers your question and again let me apologize for not getting back to you sooner!
Hey. Great vid as always. Question; you close the suction service valve only when testing the Compressor valves/performance ? I remember on a previous vid you said when you pump down to close off the high side to allow the com to suck all the refrigerant. But on this vid you said it is dangerous
Thank you for your comment and for watching the videos. I'm glad to hear that you like them. In the other video I was talking about pumping the system down. When you pop down you close of that liquid line service valve or the king valve. In that video I believe I was talking about closing off the liquid line service valve. When you do that you pull all of the refrigerant from the liquid line and from the evaporator and put it into the condenser and or the receiver. In this video I am talking about closing off the discharge valve. I am saying to not close the discharge valve because these compressors are positive displacement compressors and because of that something will break. So it is a little bit different than in the other video. I hope this answers your question. Again thank you very much and keep watching and keep learning!
@@AirConAcademy thanks for the reply and understood. Have a good day
thank you so mach i have a quastion where is the metering device usually located on a mini-split system
Fesal Modi The metering device would still be placed on the indoor unit in a mini split if it is a straight AC unit. If it is a heat pump then you would still need one in 2 places. One inside and one outside.
Nice tutorial , can you please explain also about how chiller for AC work
Ohhh yes I am making a note of that now I hope I can get a video out on that soon!!! Good suggestion!!!
Thank you and God bless your channel , I like your channel due to Im refresh all the theory about HVAC System .
@@roelpagapong5998 Thank you so much for your comments. That means so much to me!. He posted I hope to have more videos on here soon. Thank you!
Thanx for knowledge sir
Thank you and I am glad you liked the video!!!!
Hi again Mr. Julio, thanks for continually sharing with us your knowledge sir. My experienced today with the car ac was that at idle it blows cool air, but when you accelerate or raised the rpm even up to 25 or 30, it stops cooling. And if you put the ac off and after 30 sec. you on it, it starts to cool again and thereafter repeat the same thing again when you accelerate.
Any solution(s) sir?
Thanks in advance, MOSES .
In the case car AC when it behave such way pls check thermostat and the high pressure switch one of this may be faulty sir
I am so sorry that I did not see your message until just now. I know it has been a year I hope you got your problem resolved. From reading your comments it sounds like he might have had a restriction in the system so when you increased the RPM there was not enough refrigerant going into the evaporator to do any cooling. I have seen this or something similar when there is a partial blockage at the strainer before the metering device. Again I am sorry I missed your message until just now I hope you have a problem resolved.
So if the lp side is higher than the hp side it means the valve is bad in the compressor and we have to replace the compressor in split unit?
Hello Aircon Academy, if the system have more than one valve plate assembly how we can find the damaged valve plate?
We have always replaced all of the valve plates. Sometimes you can hear the sound if you have a stethoscope. Other times you may have to inspect them one at a time. sorry I do not have a better answer.
I have one doubt about chiller was tripping on low discharge superheat.
What we have to check in chiller ?
how can we test if the valve still working fine? thank you
I'm sorry, I just now saw your question. Just like I was explaining in the video. You close off the service valve to the compressor and see if the pressure will stay down or low and it will not come back up. If it is a residential unit it is a bit more difficult because all you have is the suction line service valve on the unit .
Thanks teacher.
please what is gonna happen if the rings of piston are bad ?
On smaller units 30 or 40 ton, compressors typically do not have rings. On larger units 75 ton on up the may have rings and if the rings fail the high side pressures would drop and the suction pressure will increase. You may also loose oil by pumping it out.
Hello Aircon academy, if the suction service valves are closed and even if the suction valve on the compressor is leaking, where is the pressure coming from then.
Greats!
Thank you !!!
👍
Thank YOU!!!!