HVAC 091 EXV EEV Electronic Expansion Valve introduction

If anyone can send me a bad EXV EEV I would appreciate it. I need a few to cut apart.
For Commercial check out my friend Chris with ‪@HVACRVIDEOS‬
Here is a video diagnosing a faulty EEV • CAN THE BEER WALK IN B...
As promised
‪@EngineeringMindset‬ videos on Electronic Expansion Valves, many GREAT videos he has ! check out his channel
How EEV works - Electronic Expansion Valve working principle, HVAC Basics
• How EEV works - Electr...
Electronic Expansion Valve - How it works ETS 5M HVAC
• Electronic Expansion V...
theengineering...
The news article on Electronic Expansion Valve
www.achrnews.c...

[@imranshaik675]

Thnx for the video. Biggest disadvantage of EEV is when it comes in contact with foreign particles with refrigerant its needle gets stucked. Resulting sweating ( Dew formation ) on indoor front grill panels in VRF units. Sometimes also liquidification.

[@hubercats]

I believe this to be true of all types of metering valves.

[@vnesmuonnam]

Thank you. Short video, ton of information, easy to understand.

[@toyinorodare4072]

You are doing a great work in the Industry. Thank you for the assistance

[@hubercats]

Hi Ty - I’ve been using stepper motors quite a bit recently and have learned a lot about them. Please don’t hesitate to reach out if you have questions. In short, stepper motors can be configured such that each time an electronic controller sends a pulse, the motor increments by a fixed angle. In the example you mentioned, the motor is set to 1600 steps per revolution. So each step corresponds to 360/1600 = 0.225 degrees per step (this is the angular resolution). In the case of these valves, each step will cause a 0.225 degree rotation which in turn will cause the valve to move by an amount that depends on the pitch of the internal threads. Also, stepper motors have a second control line that specifies forward or reverse. - Cheers - Jim

[@mansourghadhban236]

Thnxs more hope we see more details about them with u.....eng mansour from Iraq

[@shine-cg9uf]

Great video 📹👍👏. Thanks again for sharing your experience and knowledge.

[@dario6749]

Hi Ty, I hope you are doing great. This question doesn't have to do much with the video but is something I've had in my head for days. On mini splits you have two lines going into the indoor coil, one line is the vapor line, the other is the expansion line with liquid/vapor saturated mixture inside. My question is, given that we have a saturated mixture running on the expansion line shouldn't we be able to check superheat just by taking temperatures on both lines? Thanks a lot and have a blessed day.

[@love2hvac]

Yes, but because they are variable capacity compressors and variable fan inside the superheat will change. Check outy friend Craig with AC service tech for great ductless videos and his ductless inverter book!

[@idontwantachannelimjustcom7745]

@5:50 its a stepper motor. These are brushless motors that can hold a position. Brushed motors can go forward, backwards, or spin freely. Brushless can hold positions of usually 1.8° or .9° increments per rotation, and have reduces holding torque with microstepping. Ive seen microstepping of 1/256 of a step. You see them a lot in cnc, 3d printers, or robotic arms.

[@love2hvac]

As soon as I get some to dissect, I will do a more detailed video including that important information. Thank you

[@samersarah957]

Thank you Ty, in EEVs should use superheat,sub cooling or both. Thanks.

[@love2hvac]

Charge it with subcool but check superheat

[@MrElemonator]

You’re awesome! 😂 your jokes hit hard.

[@lyndonlakhansingh]

Wonderful explanation. Can you do a video on inverter ac sometime plz🙏

[@love2hvac]

Yes I will, Im a little ways away from that point but It is on the roadmap. thank you for the suggestion.

[@hubercats]

Here’s Avery good overview of inverter technology: kzbin.info/www/bejne/op-ch41_gZ2ljNU

[@lzgamer8133]

Ty can we please get a video on zoning boards operation and troubleshooting please dude. Also on another note my buddy Jordan B was a student of yours and he said you told him to never change breakers because of a potential fire hazard.

[@love2hvac]

I'm a good ways away from airflow. It I will ad that to my list. As for breakers. Changing a breaker is easy however in most states that falls under an electrical license. The reason is for a few parts. 1 the electrician would look at more than just the breaker, they would look at wire size, load and wire type to ensure it was safe. For example a loose connection on the HVAC breaker could also be loose connections on others as they where installed at the same time by the same person. 2 the electrician (should be) trained to look at more then just the breaker. They would bee looking at the while panel and may find other issues related or unrelated to the one at hand. 3 too many times I have seen hvac techs put in larger breakers, the wire then become the fuse and could cause a fire. 4 breakers rarely fail. There is usually a cause such as long-term overloads, spikes in voltage, and shorts in wires or in motors. 5 codes and liability. Each state is different. For example Texas will allow a licensed hvac company to do electrical work specifically for HVAC equipment exclusively up to and including the equipment disconnect. 1305.003(a)(11) Other states will not allow disconnects to be replaced. I like to leave the electrical work to the electricians and keep the electricians away from our HVAC equipment. Tell Jordan I said hello and never stop learning.

[@moonlightacmaintenance3232]

Ty this is off topic but you’re a genius. I’m working at a school with several units on one side of the building and several units on the other side of the building. Multiple units are down. One I got running today after I cooled it off and got it out of thermal overload. 48psig vapor 230psig liquid line. R22 I believe it’s a plugged metering device. Have you ever used a wire toner on 24v wiring to match condenser to air handlers ? Just a idea that popped in my head. I think it would need to be a live wire toner. Any merit to this idea? I’m new but crafty.

[@love2hvac]

That's a good idea. I use to get a helper to work the thermostats while I found the OD unit. Then I like to label the thermostat and also on the sub base Them label the unit and also inside the electrical panel of the unit. Thanks for watching.

[@hubercats]

Great video, Ty! One very minor correction is that these types of motors are called stepper motors, not step motors. - Cheers - Jim

[@love2hvac]

Thanks Jim As soon as I get some to dissect I will make a make another video and I will make the correction. Hopefully I can how how the stepper motor works too. Thank you for the feedback!

[@yonasweldekidan2077]

@@love2hvac hey Ty ,you are right about calling it a step-motor. If you refer on the book "Refrigeration and air conditioning technology 8th edition" page 611 it is referred as step-motor not a stepper motor.

[@stupidtablet1478]

Is there a EXV EEV retro fit for older units?

[@love2hvac]

I know there is for commercial ke2therm.com/

[@realestateservicessaleshea99]

Are there any specific troubleshooting tips for this style valve? Thanks.🤔

[@love2hvac]

I will be doing troubleshooting series eventually. Biggest issues is denise in the pin. For trouble shooting Feed it the proper subcooling and then check superheat to see if its maintaining. Most manufactures will have specific printed troubleshooting flow charts. From there for checking the step motor, thermistor and transducer. I posted a link in the description with Chris diagnosing one.

[@realestateservicessaleshea99]

@@love2hvac 😊

[@merajahmad8976]

Where we can install pipe in out sensor for eev make a video pls

[@michaelmolter8828]

I never really understood why furnace controls never have a microcontroller on them. Tons of expensive, complex, old school logic gates.

[@love2hvac]

Great point. From what I understand, they want to keep the fail safe in place. Having the internal patches and gates keeps the sequence in check. For example the 24v from w is patched therw the relays so if anything in that series stops it shuts off the gas valve. They where concerned that full microcontroller logic boards could potentially energize the gas valve without the inducer fan and potentially have a fire hazard. But I'm not an engineer.