They had scroll technology around 60 years ago. They had a seal between the scroll and it routinely failed. The machining process gets the tolerance much lower now so the gasket is no longer needed. I’ve seen the cut outs of these scrolls but never seen a running cut out. This was very cool thanks for the video.
@@jamesv4463 the scrolls are covered in oil. The oil acts as a seal that covers the microgaps and prevents the air from leaking. It also covers the surface of the scrolls and prevents them from getting cold welded together.
@@aryanarya8741 from my understating the metal was actually making the seal, hints why this kind of compressor can actually improve over time. it wears into eachother
@@jamesv4463 it is impossible for a machine like this to run without oil in my opinion. the cold welds will increase the friction so much and will destroy the seal. no matter how perfect the seal is there is oil involved that protects the surface
Thank you So MUCH for this video. For years I have wonder how a piston compressor could fit my window AC unit!!! Now I understand.. It never was one!!!
That is a fantastic video! You are right there are three bearing, drive bearing, middle is the straddie bearing and the lower bearing.The lower bearing live in the oil so it does see as much wear.The straddie bearing take a ton of abuse especially on liquid flood back.I don't see that much wear on the upper bearing when I take them apart. Five Star video!
Wow. Great feedback @dizziedallas . I worked on a unit today that had a scroll that was vibrating terribly. My guess is the compressor had liquid flood back recently since there were no pressure switches installed and the system leaked out all the refrigerant. I found the compressor off on internal thermal overload
one of the failure modes for these compressors is the bottom bearing which is held in by 2 to 4 cap screws. the screws can loosen up and the bottom bearing will knock around,
I used to work at the factory that made that little plastic tube that you see attached to the side of the fixed scroll. Perhaps an older unit. The ones we made were of black plastic instead of white.
Hey Ulises I'm a little late on the vid lol I have a ZR125KC scroll that I want to tear open and see what's going on on the inside. What VFD do you recommend for that compressor ? We use 220V out here and 380V 3 phase. Just not sure what capacity I should use. It'll just be dry testing the motor like you reviewed here
I love VRV variable Refrigerant volume system that's why I love and like liked this video and I am HVAC technician so i loved the AC video but this one is really ossooom...✌️
Karl-Alfred Römer their are ports for oil to run through the entire compressor to lubricate the moving parts. Oil runs through the entire refrigerant circuit.
is the noise at 1:34 "like a moped" is normal ? My heating pump is doing same noise, I've had a pac for a few years, and I find it surprising that it makes this noise.
Joe Shearer lol yeah I did. That vfd goes up to like 500 htz. I was scared to take it up to 100 htz. Almost double the rpms. I have another compressor. I might try to take it to 200 lol.
Farther down Joe Shearer prompted the original poster's reply: "Joe Shearer lol yeah I did. That vfd goes up to like 500 htz. I was scared to take it up to 100 htz. Almost double the rpms. I have another compressor. I might try to take it to 200 lol."
@@actechformallyyomama746 the coldest part of the system. That's why you have a crankcase heater is to keep the compressor warm and avoid flooded starts. Sorry and I meant refrigerant migration not oil migration.
