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 @HVACR VIDEOS
Here is a video diagnosing a faulty EEV

As promised
@The Engineering Mindset videos on Electronic Expansion Valves, many GREAT videos he has ! check out his channel
How EEV works – Electronic Expansion Valve working principle, HVAC Basics

Electronic Expansion Valve – How it works ETS 5M HVAC

The news article on Electronic Expansion Valve

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16 thoughts on “HVAC 091 EXV EEV Electronic Expansion Valve introduction

  1. Imran Shaik says:

    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.

  2. hubercats says:

    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

  3. L Z Gamer says:

    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.


    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.

  5. I don't want a channel I'm just commenting says:

    @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.

  6. Nunya Business says:

    Wow, how did we ever get by with ordinary TXV’s, this is kind of like replacing the thermostat and defrost timer in your refrigerator with a computer board and a bunch of thermistors controlling relays on a printed circuit board that’s far too inadequate for the current draw, variable speed fans , variable speed compressors, and it all comes with a manual with instructions on how to shut the damned thing off, excuse me, to put it into display mode ! Imagine if the electronics industry came before the refrigeration industry and some genius came along and invented the “self contained TXV”, no stepper motors, no electronic controllers, no thermistors, just a simple bulb with a refrigerant charge mounted at the evaporator outlet regulating refrigerant flow !!! He’d revolutionize the industry, his name would become synonymous with Thomas Edison, they’d probably erect statues to the guy ! I see this industry going the way of the auto industry, the little garages are all disappearing and you must now rely on the dealers for service, and the thing is built with so many bells and whistles that half the time they can’t even figure out the problem and it ends up costing you a fortune to finally repair the thing ! If your serious about a career in the refrigeration industry of today, getting a degree in electronics may not be necessary but it sure as hell wouldn’t hurt , plus you’ll be in a position to rite your own ticket in this new up is down world. Just one word of warning, old refrigeration men never retire they just fade away.

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