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

You my friend, are going down as one of the best HVAC teachers ever 👏🏼👏🏼

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. 👍

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 by far one of the best EEV/EXV classes I've ever seen.....such great information, love the cutaway. Thanks for the video.

Craig, your videos always stand out in content and clarity, many thanks for a new value

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 🙏

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.

Absolutely fantastic tutorial on the operation and how it actually works. Bravo Craig

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! I was going to buy a $200 eev magnet tool but now i know all i need is an eev coil head! 🌟

You make it easy to understand with your flawless explanation. God bless you.

Thank you so much for making this video! This really helped me to understand how the EEV works and how to troubleshoot them.

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

As design and commissioning engineers, we rarely pay enough attention to these details - so I appreciate your detailed work here.

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.

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

Fantastic video from one of the greatest teachers of all time!

This is great, had issues with them but it ended up being a faulty board. So helpful to see the guts in action

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!

Excelent video. The best decription of function and principle EEV. Big thumbs up !!!

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)

This is the video I have been looking for for so long.

Excellent video. So much information to learn, I love your videos. Thank you sir Have a great weekend 🎉

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!

Super informative video , thanks for taking your time to help other people I really appreciate you doing this

Thank you for this great video. I always clicked "Thumbs Up" before watching any of your videos.

Thanks that’s very helpful I’m not very familiar with mini splits. Love your videos 👍🏽

Just WOW! This is the level after professional, illuminating!

From Romania,thank you for the presentation, very useful and perfectly presented. Respect👏👏👏

Best Expansion Valve Video I have seen ! Amazing Detail ! Salute !

Really good explanation on how these valves work. Thank you.

so:this is like an electrical replacement for the mechanical valve known as the txv.l Very awesome video.

That was beautifully explained and presented. Thanks

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

thanks for masterful and deep explaining

Ive been looking for this info for so long, thank you sir

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.

Thanks for the good information. I wish you all the best. Excellent video

like motor stepper how it works. use pulse DC for a better angle position. thank you for sharing the knowledge.

Süper bilginiz için teşekkürler

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 info. Craig. Thank you. Great video.👍👍👍👍👍

Excellent video....excellent quality love your channel!!!!!!

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.

I have not seen anyone do such detailed investigation on valve, everything possible is in there in video.

thank you very sir for a clear explanation....

@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.

it is a very useful training. thank you.

Gracias amigo exelente explicacion.

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.

Really excellent tutorial. Bravo

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!

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?

Very useful and very good explanation thanks

Basically what Doing changing the polarity on DC Like on a call window To go up-and-down reverse positive and negative To the motor

Very informative explanation, thanks

This is very much like how a stepper motor works.

I'm biggest fan of yours sir 😘🇮🇳🙏

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.

My dear explainer please note it's not high-temperature liquid, it's sub- cold medium temperature liquid refrigerant

💪🏽Appreciate the vids very informative ;You’re Making HVAC C00l Again 🤘🏽😎

Excellent Video

Awesome video! How did you get such a nice clean cut on the stainless steel body? Just a set of pipe cutters? As for the copper parts of the valve body did you just hack it with a grinder?

Thanks for the educational video

This was a great video! I'm gunna buy the book

Great video. Bravo 👏

Excellent 👏

Спасибо.

Just bought the book. Awesome content

Excellent

Tqvm, i thought it was up&down solenoid..now i know

Thank you!

Great service video on these

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

Thank you

Great video, it helps me a lot, thanks!!

Great video. Thank you.

This a great teacher

Very good , how about charging cooler/ freezer floating head system with EEV by value open %

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.

Thanks!

Your videos are top tier

V good representation , thx alot 👍👍

I like the explanations.

Trimakasih bos

thank you

Similar to a stepper motor, very cool

Great explain ....

Great video Greg!

Great video

Can you explain how to diagnose communication error on split system by any chance? It's common problem and I don't know much about it. Does that split system book cover the troubleshooting of communication error? Thanks heaps.

Very great explanation and practical Thankyou

Great video, thank you!!!!

That was great, thanks.

great video!

perfect video thanks a lot for

Thank you sir you the best...

Very interesting as always.