Compressor Unloader - HVAC Online Training and Courses 

I'm so glad that my video helped you understand unloaders! Thank you so much for your kind words and I am so glad I could help! Thank you and keep learning out there!

Soil heavsystom gas potavting systom soild conrold mechionom sely gas insidd pards dsmgd sdlfeyunlored opn coglod moregax powed edom potacting inside parts slftg valplat hedpate pidon all poractinv sydtim rightedunlored pudhinschion t go oponvslvd op pas dis tbuitng systo motr aut msticsl off self gax lord inde nog pas sinv hevey equpited ok

@@jollyscaria1922 hi, I am not sure what you're trying to say. I wish I could help you. If you could please try again. Thank you.

Wow! Thank you so much for your kind words! I love teaching, and it gets me motivated even more when I know I'm helping you guys out there! Thank you for watching!

Thank you!!!

What city and state????

@@TheSkunk1996 Virginia

l'm from Indonesian you're best

Thank you!!!

I'm glad you like the video and I am glad that it made sense to you! Keep watching the videos and maybe the other ones will help some more! Good luck out there!

Thank you so much for your kind words! I really, really appreciate your comments! And thank you for watching!

Thank you!!!!!

Thank you so much!!! It is comments and people like you that make me want to do more!!! I hope to see you in class soon. Thank you!!!

Yes, you are correct. A lot of guys get confused with the loading and unloading and with the pressures rising and falling as it loads and unloads. I am glad he liked the video. Thank you for watching!

I have never worked on and ammonia system. Thank you for letting me know. I was not aware that ammonia was corrosive to motor windings! Thank you and thank you for watching!

Thank you so much! I really appreciate comments like this! It took me a while to make this video because I do all of this myself. I'm glad I could help! Good luck out there! And keep learning!

Thank you for the wonderful comment! That's why I do these to help you guys out there. Thank you for watching!

Thank you!!!! I am glad you liked the video!!!

Thank you so much! I really appreciate your comments, and I hope to make some more soon!

Thank you so much! I really appreciate your comment!

Thank you so much for your kind words! I'm so glad to hear that I was able to help you. I hope some of my other videos can also help you, keep learning out there! Thank you!!!

Wow! Thank you so much for the kind words. I'm glad you enjoyed the video and thank you for watching!

I am glad I can help!!!

Thank you so much! Thank you for your compliments and thank you for watching. I am not sure what you mean when you say pressure equalized? I believe you are talking about the pipe that is normally connecting two compressors when they run tandem Lee like in a chiller? One of the reasons they do this is because of the oil. As the compressor runs, it will pump some of the oil out because it mixes in with the refrigerant. As the suction Gas comes back, the oil is mixed in with it, and it would collect in only one of the compressors, if we did not have this equalization pipe between the two compressors. I hope this answers your question!!! And again, thank you for watching!

Thank you so much for your kind words. I am so glad that I can help people understand how things work. please tell your friends and co workers about these videos and have them subscribe to my channel. If you have any suggestions for videos please send me a message. Thank you

Thank you!!!! I am glad you like it!!!!

Thank you so much for your kind words! I enjoyed teaching, so I am so glad that I could help! If you get a chance, check out my webpage airconacademy.com I know I did not like school because I did not have any teachers that could actually teach. I enjoyed teaching so I think that makes a difference. Thank you for watching!

Noel Baracho Thank you! I hope they help.

Thank you so much! I'm glad you like the video! Keep learning and be safe out there!

Thank you so much! I’m glad you liked it. I hope I can get some other videos online soon.

Yes, that could be an indication. You should check to see if the unloaders are unloading before the compressor shuts off. I mean it should be fully unloaded before it shuts off. Unloaders work great and it minimizes the constant starting up and shutting off of the compressor.

Thank you! And thank you for watching!

Thank you!!!! I am so glad I can help!!!!

Thank you for letting me know! I was wonder where everyone is from! And I hope it helped!

You are very welcome! I'm so glad to hear you say that you have learned a lot! I have been doing this for a while so I can feel myself on the way out! I'm glad you guys can come in and take over! Good luck and thank you for watching!

Thank you and thank you for watching!

Thank you for your comment! And I'm glad I could help! Thank you for watching!

Thank you!!!

You're welcome! I'm glad you enjoyed the video and thank you for watching!

Thank you so much! I am glad. That's why I do this to pass this information on!

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

Thank you so much! I'm glad you like the video and I'm glad to help!

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

HA HA!!! Yes it is I don't like to read but I like teaching more then I dislike reading so I read so I can teach. If that makes any sense? and doing this so long I have also learned a lot out in the field. Thank you for watching!!!

Thank you so much! And thank you for watching!

Yes if your compressor is fully loaded when the solenoid is de-energized and you remove the solenoid, then the compressor will always be loaded and it will operate without any problems. that is ok. thank you for your question.

Thank you! I am glad you liked the video! And thank you for watching!

Ali imran thank you!!!!

Gracias!!! Espero que esto lo ayude!!!!

I am glad you like it!!!

Thank you so much for your kind words! I'm glad you like the video and thank you for watching!

Thank you so much! And thank you for watching!

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

HA HA!! Thank you!!!

Welcome

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

Thank yo and thank you for watching!!!

Thank you!!!!

Thank you and I'm glad you like the video! Air compressors they load and unload to keep the electric motor from drawing high amperage. Every time an electric motor starts up it draws high amperage and that cost money in electricity. Plus it puts stress on the motor. So it is best to just unload the air compressor so that the air is not being compressed and being dumped out so that you don't have the start and stop on air compressors. I hope this helps and again thank you for watching!

Thank you very much! And thank you for watching!

Thank you so much! I'm glad it was helpful!

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

Thank you!!!

Thank you so much! I really appreciate your comment and thank you for watching!

Thank you! I'm glad you liked the video and thank you for watching!

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

Thank you very much! Thank you for your comment and I'm glad you enjoyed the video! Thank you for watching!

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

Thank you!!!

Thank you so much! I'm glad you liked the video!

Basically, all valves to and from the compressor have to be closed in order for psi to build or get higher. This is because the compressor takes for example 10 ounces of space and compresses it into 2 ounce of space. If the suction side valve is open and the piston is moving up and down I have all that space from the compressor piston all the way back to the evaporator coil. This can be for example 100 ounces. The compressor now with the unloader operational is taking 110 ounces of space and compressing it into 102 ounces. This will barely raise the psi in the system and wont affect the flow of refrigerant. 10 ounces down to 2 ounces causes refrigerant to go from 10 psi to 100 psi 110 ounces down to 2 ounces causes refrigerant to go from 10 psi to 11 psi. If you think about that, 110 psi compared to 11 psi, the discharge side of the compressor is so much higher than the suction side. Basically this difference in pressure wont matter to the flow of refrigerant and your system will work. Even if you were able to have some flow of refrigerant from the suction side to the evaporator there would be a check valve installed on the system that would make sure that you have the proper flow. Try to think about the volume that the compressor has when both valves are closed and how much it can compress vs when the unloader forces it open and you have a large area/volume that cant really be compressed.

Thank you! And thank you for watching!

Thank you so much! I really appreciate your comment!

Mahdi Shahsavari hi, there are several ways of unloading compressors. You are correct in the sense that the newer compressors do everything by controlling pressure and opening or closing the suction port. But over the years there have been many ways of doing this. Thank you for watching and commenting.

Good morning, I have a question for the technician, that after I disassembled the Carlyle 5h80-A194 compressor and replaced the new spare parts, namely the piston, ring, conroad, bearing conroad complete with 4 slave cylinders. After that, I tested running, but it looks like the compressor is not powered up, even 2 cylinders feel hot. I've tried opening the cylinder cover again and checking that the valve plate is installed correctly, the suction valve is in position. Then the test run again, the result is still the same. Even the capacity valve has been adjusted. clockwise or vice versa, but the compressor is still not powered. my question: can i be helped to find a solution so that the compressor can run normally and can cool down. notes. now i run compressor no two normal and cold. Thank you in advance

There are many different ways to energize and de-energize the solenoid. It can be done with a two or three stage thermostat. It can also be controlled by suction pressure or oil pressure. As the low decreases the suction pressure will drop and the oil pressure will also drop by monitoring this I have seen that they have controlled the loading and unloading of compressors. The easiest way is like I mentioned above by using a thermostat. As the load increases the thermostat would load another bank of cylinders doing more cooling, as the heat low drops it would unload the cylinder so that it is not doing that much work. And do less cooling. I hope this makes sense. I hope this explains it to you. Good luck.

I'm sorry, I am not sure what you mean by compound compressors? Are you talking about when you have multiple compressors and multiple evaporators? If that is the case I have a video on EPR valves. And how they are used to maintain different pressures and temperatures in evaporators. I'm not sure if this is what you were talking about. If you get a chance please let me know if that is what you were talking about or explain to me what you mean by compound cooling so I could possibly make a video of it. Thank you for your question!

Thank you for watching!!!

Thank you!!!! I am glad I can help!!!

I'm glad you liked the video and thank you for watching! Check out my other videos!

I am glad I cold help!

HA HA Yes I am thanks!!!

Oil is pulled out of the oil sump at the bottom of the compressor, the oil pump that is at the front of the compressor will pump it through the crankshaft, because the crankshaft is hollow, the crankshaft has holes in it where the bearings are, so as the pump pulls the oil out of the oil sump it pumps it into the shaft and through the holes and it lubricates the bearings as it lubricates the oil falls back down to the oil sump to be used again. I hope this explains it. Thank you for watching!

@@AirConAcademy Thank you so much Sir.

Yes, that is the only way to get the charge correct. To make sure the system is fully loaded. I don't know how your unloaders are set up but make sure that the unit is calling for full cooling so that the unloaders will be loaded. You will see that the pressures will change. The suction pressure will drop and discharge pressure will increase. Only then will you be able to get a charge correct. Hope this helps.

Thank you! And thank you for watching!

Thank you and thank you for watching!!!!

Thank you! And I'm glad you like the video!

It will not be that much warmer! If the cylinder head is hot you could have a blown gasket and hot gas is going into the low pressure side. How are your pressures? Do you have a high suction and low discharge pressure? This is one way to tell if you possibly have a leak. Good luck!

I am glad you liked it, and thank you for watching!

It could be the unloader, it could be leaky valves, it could be a blown gasket. It could also be a leaky solenoid valve on the liquid line. From your description it sounds like you have a pump down system. Which means that it would have a solenoid valve on the liquid line and it would be the low pressure switch to cut the compressor off. One thing you could do is close off the suction valve to the condensing unit and see if the pressure increases or if it needs to pump itself down. If it pumps itself down then the problem could be with a compressor. If it does not pump itself down then it could be a leaky liquid line solenoid valve. Try this and hope that this will help you figure out if it is a leaky liquid line solenoid valve or if the problem is in the compressor. Good luck I hope you can figure it out!

Thank you, and I’m having a webinar in a few minutes it is free so if you wish to join it please go ahead and join it

www.airconacademy-courses.com/event-details/hvac-troubleshooting-webinar

yes you want to maintain around 4C as the load increases the evaporator pressure or suction pressure should increase not drop, but when the compressor loads up that is when the suction pressure would drop to keep the pressure where it should be 60PSI so it can stay around 4C. As the load decreases or the room temperature drops it will automatically unload. and yes every time the cylinder loads up (or it is doing work) the pressure should drop and when it is NOT doing work the pressure will increase.

1. High suction superheat is when you have the suction gas coming back to the compressor and it is too warm. If it is too warm, it is not going to call the compressor down like it should and the compressor might overheat and tripped on internal overload. 2. Just like I said, before if you have high temperature on the suction line. It will affect the compressor the valves because of the high superheat may overheat, specially the discharge valve and you could destroy those discharge valves. I'm not sure what you mean by love limits. But if the suction pressure is too low, your compression ratio will be high and that will work the compressor very hard then again, overheat or destroy a compressor. 3. If your temperature is high on the high side, you are going to damage the discharge valves up and they will leak and because of that you compressor is not going to move refrigerant like it should. We need to make sure the compressor stays full so it will last a long time. 3. Typically liquid came back to the compressor is going to give you the liquid knocking you were talking about. If you do not have superheat, then that will cause this problem you're talking about and kill a compressor. That's why you must have the proper amount of superheat. I hope this answers your questions. You should take a look at my webpage, airconacademy.com, where I have some courses and explain all of this. Thank you for watching and for sending these messages over to me. Good luck out there!

@@AirConAcademy Many thanks Sir

On older compressors, yes! It will tell you whether the compressor is loaded or unloaded and how many stages are actually doing work. On the newer ones than me adjust the speed of the motor/compressor! But if you have unloaders, you will have to hook up gauges and look at the pressures. So if your suction pressure drops when the the unloader has a magnetic field. Some manufacturers will energize the coil to be loaded. Others will deenergized the coil to be loaded. But you have to look at the pressures so you can make sure which way the manufacturer is doing it. If your pressure drop when there's a magnetic field, or the unloader solenoid is energized, then that means that they are energizing the solenoid for that to be loaded! Or in other words doing work. I hope this answers your question. And thank you for watching!

24 voltage is sent to the coil and that is what energizes and de-energizes the coil. But this voltage is controlled to various ways. One way is through a thermostat that has several cooling stages. Meaning that stage one during the compressor on and stage two will load and unload the unload. At other buildings it is done through the electronics that control the temperature throughout the building. I have also seen it where the unloader works off of suction pressure and oil pressure. So as the suction pressure drops they know they need less cooling and they unload, the same with the oil pressure when the oil pressure drops they know they need less cooling and the unload. It is hard to give you just one quick answer as to how that is controlled. Thank you for watching that question!

That is a good question. Some are operated by oil pressure, some are operated by suction pressure, some are by demand. Meaning that if you need more cooling it will load up if you need less cooling it will unload and do less work.

@@AirConAcademy Thanks for sharing. I look for to more especially on animations. Keep up the good work.

I am not sure without actually looking at it, but it sounds like it may still be part of an unloader. There are so many different configurations out there with a short description it is hard to tell. I'm sorry

@@AirConAcademy thank you.