Mini Split Book on Our Website- www.acservicetech.com/mini-split-book Mini Split Book on Amazon- amzn.to/3ytHJSs Mini Split Book on TruTech Tools- www.trutechtools.com/BooksGuides Mini Split E-Book on Google- play.google.com/store/books/details?id=HN-iEAAAQBAJ Mini Split E-Book on Apple- books.apple.com/us/book/id6445178399
I've heard that " clicking sound " so many times when starting up a newly installed minisplit but never knew that is was the metering device. These videos really give me an edge in the field.
I feel like I’m back in college studying electronics technology but with more hands on training. You would make a great professor at a university sir. Thanks for the free college classes. 👍
this really helped me during replacement of 2.5hp LG compressor, i had to remove the EEV to create space after the workdone i fixed the EEV clockwise direction and the system couldn't discharge refrigerant i came across this content that helped me understood the magnetic force and i clipped the EEV in anticlockwise direction and it worked 💪 ❤❤❤ really grateful 🙏
outdone yourself....I bought your manuals out of respect, going to gift my apprentice because real recognizes real and I cant explain like this...amazing job my friend
Fascinating... This explains the "rattle" on the old FloTronic EXV (Carrier) at start up when it drives closed for pump-out at start up. Same operation as these, just bigger. Glad you made this video!
The cost engineering on these things is outstanding. I am a design engineer that has worked in various commercial and aerospace applications. We don't have the option to make ultra-high volume disposable units like this. It's actually hard to design this stuff to meet the cost and volume requirements. Very clever.
I’m impressed dude. I wish I had more instructors like you and tech school. Although mine were pretty good down in Lawrence County Georgia- Gwinnett Tech. During initialization, I think it only seats it in one direction. The manufacturer knows how many pulses it takes to get to the other end.
One of the best EEV videos and explanations I’ve seen. -Certified Tech Support for Mitsubishi(DSG) and Fujitsu(TSA) VRF. Keep em coming! EEV’s are very reliable like you said, and if something fails, it’s most likely the coil. Mitsubishi makes a magnet that allows you to manually open/close. I can get you the PN if you are interested.
Just had to replace one of these EEV's on a Daikin at tech supports direction, and at the end of replacing it i still had almost no clue what it actually was. This vid came out the next day, lol thanks for your clear presentation. I bought your 1st book, and am eager to order this one as well! These minisplits are mysterious to me, and i dont necessarily like servicing them, but they definitely seem like the "way-of-the-future", so thanks for keeping us ahead of the curve!
@acservicetechchannel I work for fluid Chillers and I am pushing hard for us to have these on all of our Chillers especially our large low temperature Chillers. Controlling the superheat especially with large load swings is extremely important for efficiency and the life of the compressor.
Thanks for the wiring orientation. I made one up but did not have the specs on it as it was a 6 wire. Been able to successfully replicate the results here, many thanks from me
Carrier had these on their flowtronic chillers. I had to replace two. They were very large, and made of brass. Pipes were 1 1/8” in and out. Ran on the same type of stepper motor, but used a lead screw to drive a slotted piston up and down. Two refrigerant circuits, 125 tons each. The chillers were an absolute service nightmare.
Whirlpool had this they might still have it on some of their french door refrigerators but five years ago they had this and we learned about training on it and one of the instructors he mentioned there was a filament that you can put up next to it and it'll show the magnetism. It was some special filament. I forget what it's called. Great video. Your new book that I purchased arrives Tuesday looking forward to it
Stepper motor valve. Very nice and precise. I would have thought there would be an encoder but going full out and in is good way to get a blind position unless there is something stuck (not sure if there is a situation that causes that)
Hi, glad to get in touch with you. I work as an air conditioning technician for Mitsubishi Heavy Industries in Spain. I am pleased to inform you that I have developed a small tool to check the EEV of the different air conditioning equipment. Carrying out tests on devices for domestic, industrial, VRV and Aerothermal use of the previously mentioned brand and also domestic Hisense. These teams mount EEV from the manufacturers FUJIKOKI, SANHUA and SAGINOMIYA. With the device, the technician can verify three points that I consider important in the diagnosis of the element: - If the A/C equipment pcb transmits the signals to the EEV. - Measures the resistance of the EEV coils. - Finally, it can be opened - closed automatically, or manually select the number of opening or closing pulses. If you find it interesting, you could expand the information you consider appropriate. Greetings
Apparently the magnet in the vent and the coils outside form a rough stepper motor. It saves a relative expensive standard stepper motor (which could as well get magnetic coupled to the inside of the vent), but provides some sort of positioning control. A little DC-motor with an incremental encoder would be more expensive and its gearbox has more wear.
Never power a solenoid coil without the core that it operates. Without the core it won't generate a back EMF and the coil will experience overcurrent and burn out.
To be fair he said that in his video he’s pretty smart and has helped me a lot in my career along with Bryan Orr and gray furnace man. Just a few more resources for you.
It’s not a solenoid coil it is the field windings of a small stepper motor. He did no damage to it as there are only small electrical pulses provided in order of the colored wires, that drive the motor in small increments.
320 pulses for full travel is a good resolution but if you had something a little bit less precise, there's always the method of "half steps" that you can use that's not that much more complicated. It will double your number of possible angles you can position your motor at.
@9:30 many use say 1500 pulses and even into the thousands to go from full closed to full open. The stepper motor driver can do 1/2 step or 1/4 step down to say 1/8 etc by applying pwm varied pulses to the next pole while the first pole is still energized to clock the magnetic field between the two and then trims the first coil pwm down until it finally clock's to the next field. So then it an take 100+ various steps to do one rotation and have more precise control. On my DIY I just do full step and it takes right about 255 pulses to go from closed to open.
I had just replaced an EEV coil as the air from the evaporator is not cold and the compressor kept tripping. Tested the EEV and the resistance for all the EEV coils are similar to that of a new EEV. However, after replacing the EEV with a new one, the system is now operating well. What could the likely cause be for the frequent compressor tripping?
For a multizone mini split system in cooling, why when one unit is turned on, the line ices up and the system won’t cool but as soon as you turn on a second indoor unit, then they both cool as they should?
I have a Daikin Multi Split unit (MXM series) which had valves replaced due to failure. Now they replaced the motherboard because Daikin sent a new board that sends a higher current to the EEV. It worked for about a month. Now back to square one because one unit inside stopped working again. It seems that these coils are prone to fail on Daikin units. I hope other brands do not have this issue.
I'm working with a danfoss EEV valve and controller. The motor coil has 5 wires red, black, yellow, orange, and gray. They don't use the gray wire which I assumed was the common. Have you seen systems like this that don't use a common?
I have a 12k air handler and a 9k dual unit. I’ve always been a little skeptical as to wether the evaporator coil has ever given more than 50% ramp to the compressor. If I remove the thermostats from the line sets, I can get it to ramp up 90% and it will stay there until it freezes over (usually takes a few hours). Even when I put the larger 12k unit on turbo and set the temp to 65, it will not give me more unless I pull the thermostats on the line set. Do you think the EEV could be the culprit?
Not sure if it would be overkill, but with the availability of really cheap handheld oscilloscopes it should be possible for a technician to verify the presences of the pulses. If you add a relatively inexpensive current probe it is not necessary to pierce the wire. to see the current. Also with the current probe it should be possible "see" the movement of the valve. A similar principle is used for checking electronic fuel injectors to see if the pintle is stuck. If the pintle is working it is possible to see the pintle hump as the injector moves.
Great video! I wonder why they have those center taps on the coils? Why don't they drive this with just 4 wires by alternating the polarity across the two coils, which would require only half as much copper for the same amount of torque. Also, why don't they put a conformal coating over those teeth to prevent that rust buildup? Thanks!
Great explanation of the stepper motors in EEVs. And thank you for saying "negative"! Seems everyone these days says "plus" and "minus" when referring to DC polarity and yes, a pet peeve of mine. Positive and negative dammit! lol
And of course if we use pwm signals we can split steps into microsteps of 1,8 degree divided by 256 ...so the valve can control the evaporator superheat with amazing precision.
Professor, if you could please explain to us a video about the closed electric expansion valve, which carries the model EX7-121 from the working company Amrison, the method of connecting it to the driver, its maintenance, and its problems. I thank you for your cooperation. We greatly appreciate it.
Very good video. Am I correct in assuming that the valve is not field serviceable? Can the body be disassembled for cleaning? Of manually forced open for any reason?
Mini Split Book on Our Website- www.acservicetech.com/mini-split-book
Mini Split Book on Amazon- amzn.to/3ytHJSs
Mini Split Book on TruTech Tools- www.trutechtools.com/BooksGuides
Mini Split E-Book on Google- play.google.com/store/books/details?id=HN-iEAAAQBAJ
Mini Split E-Book on Apple- books.apple.com/us/book/id6445178399
Craig your brand is single-handedly changing the service industry for the good! Well done!
Thank you so much Tim and I'm looking forward to meeting you at the Symposium in a couple weeks!
Would this be transferable to the systems in the UK? For example, does it have both voltage differences and temperature differences?
How much torque do those tiny motors have?
*_It's a servo valve!!!_*
You my friend, are going down as one of the best HVAC teachers ever 👏🏼👏🏼
Agreed.
Absolutely brilliant video
th-cam.com/video/vtVBpEzApOE/w-d-xo.htmlsi=nc5yjOkZnO2FYZlZ
I've heard that " clicking sound " so many times when starting up a newly installed minisplit but never knew that is was the metering device. These videos really give me an edge in the field.
I feel like I’m back in college studying electronics technology but with more hands on training. You would make a great professor at a university sir. Thanks for the free college classes. 👍
th-cam.com/video/vtVBpEzApOE/w-d-xo.htmlsi=nc5yjOkZnO2FYZlZ
this really helped me
during replacement of 2.5hp LG compressor, i had to remove the EEV to create space after the workdone i fixed the EEV clockwise direction and the system couldn't discharge refrigerant
i came across this content that helped me understood the magnetic force and i clipped the EEV in anticlockwise direction and it worked 💪 ❤❤❤
really grateful 🙏
Thank you bro. My problem was like that. But I knowed now
This is by far one of the best EEV/EXV classes I've ever seen.....such great information, love the cutaway. Thanks for the video.
outdone yourself....I bought your manuals out of respect, going to gift my apprentice because real recognizes real and I cant explain like this...amazing job my friend
Thank you so much!!!
As design and commissioning engineers, we rarely pay enough attention to these details - so I appreciate your detailed work here.
th-cam.com/video/vtVBpEzApOE/w-d-xo.htmlsi=nc5yjOkZnO2FYZlZ
Craig, your videos always stand out in content and clarity, many thanks for a new value
Thank you! I was going to buy a $200 eev magnet tool but now i know all i need is an eev coil head! 🌟
Fascinating... This explains the "rattle" on the old FloTronic EXV (Carrier) at start up when it drives closed for pump-out at start up. Same operation as these, just bigger. Glad you made this video!
This is great, had issues with them but it ended up being a faulty board. So helpful to see the guts in action
Was that voltage issue on a Daikin or Fujitsu by any chance?
Refrigeration side I see them on walk ins, it was an Intelligen by Heatcraft
The cost engineering on these things is outstanding. I am a design engineer that has worked in various commercial and aerospace applications. We don't have the option to make ultra-high volume disposable units like this. It's actually hard to design this stuff to meet the cost and volume requirements. Very clever.
Absolutely fantastic tutorial on the operation and how it actually works. Bravo Craig
This is the video I have been looking for for so long.
I’m impressed dude. I wish I had more instructors like you and tech school. Although mine were pretty good down in Lawrence County Georgia- Gwinnett Tech.
During initialization, I think it only seats it in one direction. The manufacturer knows how many pulses it takes to get to the other end.
One of the best EEV videos and explanations I’ve seen. -Certified Tech Support for Mitsubishi(DSG) and Fujitsu(TSA) VRF. Keep em coming! EEV’s are very reliable like you said, and if something fails, it’s most likely the coil. Mitsubishi makes a magnet that allows you to manually open/close. I can get you the PN if you are interested.
Sure thanks!! Also, thank you for your encouragement! info@acservicetech.com
You make it easy to understand with your flawless explanation. God bless you.
Just had to replace one of these EEV's on a Daikin at tech supports direction, and at the end of replacing it i still had almost no clue what it actually was. This vid came out the next day, lol thanks for your clear presentation. I bought your 1st book, and am eager to order this one as well! These minisplits are mysterious to me, and i dont necessarily like servicing them, but they definitely seem like the "way-of-the-future", so thanks for keeping us ahead of the curve!
Thank you so much Cloakedpyro!
@acservicetechchannel I work for fluid Chillers and I am pushing hard for us to have these on all of our Chillers especially our large low temperature Chillers. Controlling the superheat especially with large load swings is extremely important for efficiency and the life of the compressor.
th-cam.com/video/vtVBpEzApOE/w-d-xo.htmlsi=nc5yjOkZnO2FYZlZ
From Romania,thank you for the presentation, very useful and perfectly presented.
Respect👏👏👏
free Top G!
Free Andrew Tate
Thank you so much for making this video! This really helped me to understand how the EEV works and how to troubleshoot them.
Excelent video. The best decription of function and principle EEV. Big thumbs up !!!
Fantastic video from one of the greatest teachers of all time!
th-cam.com/video/vtVBpEzApOE/w-d-xo.htmlsi=nc5yjOkZnO2FYZlZ
Thanks for the wiring orientation. I made one up but did not have the specs on it as it was a 6 wire. Been able to successfully replicate the results here, many thanks from me
Carrier had these on their flowtronic chillers. I had to replace two. They were very large, and made of brass. Pipes were 1 1/8” in and out. Ran on the same type of stepper motor, but used a lead screw to drive a slotted piston up and down. Two refrigerant circuits, 125 tons each. The chillers were an absolute service nightmare.
Best Expansion Valve Video I have seen !
Amazing Detail !
Salute !
Thank you for this great video. I always clicked "Thumbs Up" before watching any of your videos.
Whirlpool had this they might still have it on some of their french door refrigerators but five years ago they had this and we learned about training on it and one of the instructors he mentioned there was a filament that you can put up next to it and it'll show the magnetism. It was some special filament. I forget what it's called. Great video. Your new book that I purchased arrives Tuesday looking forward to it
thanks for masterful and deep explaining
Just WOW! This is the level after professional, illuminating!
Really good explanation on how these valves work. Thank you.
Great video , thanks for the knowledge!
From what I understood, it is a kind of specialised stepper motor!
Now I have to find an application for it!
Thanks for the good information. I wish you all the best. Excellent video
Understand Eglish explanation, more video expect, very good ❤
Stepper motor valve. Very nice and precise. I would have thought there would be an encoder but going full out and in is good way to get a blind position unless there is something stuck (not sure if there is a situation that causes that)
Hi, glad to get in touch with you.
I work as an air conditioning technician for Mitsubishi Heavy Industries in Spain.
I am pleased to inform you that I have developed a small tool to check the EEV of the different air conditioning equipment. Carrying out tests on devices for domestic, industrial, VRV and Aerothermal use of the previously mentioned brand and also domestic Hisense.
These teams mount EEV from the manufacturers FUJIKOKI, SANHUA and SAGINOMIYA. With the device, the technician can verify three points that I consider important in the diagnosis of the element:
- If the A/C equipment pcb transmits the signals to the EEV.
- Measures the resistance of the EEV coils.
- Finally, it can be opened - closed automatically, or manually select the number of opening or closing pulses.
If you find it interesting, you could expand the information you consider appropriate.
Greetings
Where can I get that info ?
@@drewc7479
Hello, I have uploaded another video and I think you may be interested. Greetings
th-cam.com/video/H0jJomVl6hE/w-d-xo.html
???
Блин это лучший канал по кондёрам!
That was beautifully explained and presented. Thanks
Great info. Craig. Thank you. Great video.👍👍👍👍👍
Ive been looking for this info for so long, thank you sir
so:this is like an electrical replacement for the mechanical valve known as the txv.l Very awesome video.
Super informative video , thanks for taking your time to help other people I really appreciate you doing this
Excellent video. So much information to learn, I love your videos.
Thank you sir
Have a great weekend 🎉
Thanks for the educational video
Excellent video....excellent quality
love your channel!!!!!!
Just bought the book. Awesome content
Thanks a lot!
thank you very sir for a clear explanation....
Excellent Video
Absolutely awesome explanation
Very informative explanation, thanks
Great video. Bravo 👏
This was a great video! I'm gunna buy the book
I'm biggest fan of yours sir 😘🇮🇳🙏
14:26 so what kind of insulation and tape is high recommended to prevent the rust out?
Ubelievable video explaination!!!!! WELL DONE!!!! Good to had more than 2 same eev's.... 😁
it is a very useful training. thank you.
Your videos are top tier
Apparently the magnet in the vent and the coils outside form a rough stepper motor. It saves a relative expensive standard stepper motor (which could as well get magnetic coupled to the inside of the vent), but provides some sort of positioning control. A little DC-motor with an incremental encoder would be more expensive and its gearbox has more wear.
Never power a solenoid coil without the core that it operates. Without the core it won't generate a back EMF and the coil will experience overcurrent and burn out.
th-cam.com/video/LzvVjvUpOVM/w-d-xo.htmlm48s
K
To be fair he said that in his video he’s pretty smart and has helped me a lot in my career along with Bryan Orr and gray furnace man. Just a few more resources for you.
It’s not a solenoid coil it is the field windings of a small stepper motor. He did no damage to it as there are only small electrical pulses provided in order of the colored wires, that drive the motor in small increments.
I did that once lol, looked away for a minute and the next it was smoking, this one isn’t an solenoid though, more like a motor
Really excellent tutorial. Bravo
320 pulses for full travel is a good resolution but if you had something a little bit less precise, there's always the method of "half steps" that you can use that's not that much more complicated. It will double your number of possible angles you can position your motor at.
Great service video on these
Thanks that’s very helpful I’m not very familiar with mini splits. Love your videos 👍🏽
Excellent 👏
Very useful and very good explanation thanks
@9:30 many use say 1500 pulses and even into the thousands to go from full closed to full open.
The stepper motor driver can do 1/2 step or 1/4 step down to say 1/8 etc by applying pwm varied pulses to the next pole while the first pole is still energized to clock the magnetic field between the two and then trims the first coil pwm down until it finally clock's to the next field.
So then it an take 100+ various steps to do one rotation and have more precise control.
On my DIY I just do full step and it takes right about 255 pulses to go from closed to open.
I had just replaced an EEV coil as the air from the evaporator is not cold and the compressor kept tripping. Tested the EEV and the resistance for all the EEV coils are similar to that of a new EEV. However, after replacing the EEV with a new one, the system is now operating well. What could the likely cause be for the frequent compressor tripping?
Could you use dielectric grease on the stainless body to help prevent the rusting ?
Can you use some dielectric grease between the coil and valve to prevent rust?
For a multizone mini split system in cooling, why when one unit is turned on, the line ices up and the system won’t cool but as soon as you turn on a second indoor unit, then they both cool as they should?
I have a Daikin Multi Split unit (MXM series) which had valves replaced due to failure. Now they replaced the motherboard because Daikin sent a new board that sends a higher current to the EEV. It worked for about a month. Now back to square one because one unit inside stopped working again. It seems that these coils are prone to fail on Daikin units. I hope other brands do not have this issue.
I'm working with a danfoss EEV valve and controller. The motor coil has 5 wires red, black, yellow, orange, and gray. They don't use the gray wire which I assumed was the common. Have you seen systems like this that don't use a common?
Very interesting as always.
Gracias amigo exelente explicacion.
Really great video. Thanks a LOT.
Thanks Fadi!
like motor stepper how it works. use pulse DC for a better angle position. thank you for sharing the knowledge.
This is very much like how a stepper motor works.
I have a 12k air handler and a 9k dual unit. I’ve always been a little skeptical as to wether the evaporator coil has ever given more than 50% ramp to the compressor. If I remove the thermostats from the line sets, I can get it to ramp up 90% and it will stay there until it freezes over (usually takes a few hours). Even when I put the larger 12k unit on turbo and set the temp to 65, it will not give me more unless I pull the thermostats on the line set. Do you think the EEV could be the culprit?
Great video. Thank you.
Not sure if it would be overkill, but with the availability of really cheap handheld oscilloscopes it should be possible for a technician to verify the presences of the pulses. If you add a relatively inexpensive current probe it is not necessary to pierce the wire. to see the current. Also with the current probe it should be possible "see" the movement of the valve. A similar principle is used for checking electronic fuel injectors to see if the pintle is stuck. If the pintle is working it is possible to see the pintle hump as the injector moves.
Great video! I wonder why they have those center taps on the coils? Why don't they drive this with just 4 wires by alternating the polarity across the two coils, which would require only half as much copper for the same amount of torque. Also, why don't they put a conformal coating over those teeth to prevent that rust buildup? Thanks!
Great explanation of the stepper motors in EEVs. And thank you for saying "negative"! Seems everyone these days says "plus" and "minus" when referring to DC polarity and yes, a pet peeve of mine. Positive and negative dammit! lol
Very great explanation and practical Thankyou
Thanks Techman!
Is there a way to check if the board is putting out 12 V pulsing?
And of course if we use pwm signals we can split steps into microsteps of 1,8 degree divided by 256 ...so the valve can control the evaporator superheat with amazing precision.
Great video, it helps me a lot, thanks!!
Let me know how to identify wires upper coil and lower coil.how about 5wire coil is this coil has upper and lower coil.
Yes we discuss that more in-depth in our inverter mini split book, thanks!
Excellent
Do you have a book on vrf system with multiple wall mount cassette, ceiling cassette and slim duct?
The EGR valve on the gen3 Prius has a motor like that. Are there any generic stepper drivers for them?
This a great teacher
Can a stuck blower fan due to a clogged condensate hose on the air handler cause the EEV to stop working?
Thank you
💪🏽Appreciate the vids very informative ;You’re Making HVAC C00l Again 🤘🏽😎
Hi, Mate. How can we test if the eev body is good or not if the normal manual solenoid valve opener doesn't work on EEV?
Great video Greg!
What probes are you using when you were checking the ohms on the plug? I need a set for mini split diag
I like the explanations.
Professor, if you could please explain to us a video about the closed electric expansion valve, which carries the model EX7-121 from the working company Amrison, the method of connecting it to the driver, its maintenance, and its problems. I thank you for your cooperation. We greatly appreciate it.
Very good video. Am I correct in assuming that the valve is not field serviceable? Can the body be disassembled for cleaning? Of manually forced open for any reason?