Just came across the same issue couple weekends ago . I pulled all that INTELLIGENT 💩 out , brazed in a traditional expansion valve , solenoid valve , coil , and mechanical thermostat, customer is good for a long time . Those EEV always 💩 mainly on weekends ,and not all supply houses stock those . Good video 👍🏼
Nice video, Bill. Glad to see you back with videos more regularly. As for that valve... I agree that it was bad 100%. The key, for me, isn't whatever voltage you measured, or whether it was consistent, but rather that the board reported the valve as open when it wasn't. That's not a function of the board, it simply reports what the valve tells it. The valves position sensor was reporting open when it wasn't. So it was bad. Now whether the board giving wonky voltages CAUSED it to fail or they went bad independantly... who knows. Nicely.done either way; you took care of the customer. Catch ya later brother.
The valve doesn't have a position sensor, doesn't report back to the controller. Instead the controller drives the valve closed but "overdrives" it, which cant hurt the valve but if there's any misstep it'll make sure closed is actually closed. From there it will count the steps as it opens. In theory stepper motors are pretty good and will track very precisely so shouldn't need feedback.
Great video, I'm starting to run across more of these walk ins, the information you teach is nothing less than valuable. For me though, when it rains, especially in central Florida, I don't risk it, I get the heck off the roof. Lightning around here is dangerous as heck and can be very spontaneous (meaning it may jus seem like only rain, but that lightning is sneaky). Plus I've got soaked enough times in my career, 😂
Nice video and yes it was educational. It happens when one thing fails then another and another. I have to say if you have Chris for tech support you are made.
I deal with these units a lot. Whenever the coil ohms out fine 9/10 times it is the board. I test by forcing the unit into a defrost and check voltage coming out of the board. That transformer being tapped wrong from jump street most likely caused the board issue
my guess, by the great prior installer workmanship. they did not nitrogen purge at all when brazing and the tubing totally is filled with black schmutz of death. probably wise in all those cases to install a filter/dryer inside the cabinet, directly before the new EXV with new tubing between them. flow your nitrogen folks!
Have not worked on Intelligen yet, but FWIW, at the training I went to last month presented by Don Fort, three things he stressed: 1.tranformer tapped correctly? 2. IF clean install practices performed, nitrogen flowed, that mechanically the EEV itself seldom is faulty. The solenoid coil, molex plug or connections, and thermistor probe all fail, but the EEV seldom since fails as opposed to a common TXV that deals with opposing forces, the EEV body is much simpler. 3. Recommended surge protection for all units with control boards.
going by the overall original install, do you think they nitrogen purged while brazing? probably hacked in god knows what used "poisoned" refrigerant, etc etc etc. the condensate drain wave(uphill low spot trap inside the box), if there's a trap outside the box, it's double trapped vapor locking with no flow and icing up.( pile of ice on the floor!)
1:24 uphill condensate drain line? is there a trap outside the box? probable doubling trapping issue and condensate backing up/freezing coil. the box door opening/closing may cause it to flow and drain out when used often, but an overnight defrost would likely vapor-lock and cause issues.
@@Holop88 in this case it saves nothing, quite the opposit. It is suposed to be able to work with very low condensing pressures And save compression energy, however this setup will not allow it. The other backdraws are they fail all the time, sensors, boards coils what have you. The manufacturer also wants a dedicated electrical circuit for this evaporator also. I dont see any savings to be made versus A standard txv.
Did ac/refrig for thirty years, how the the hell can all that electronic shit make a system better, if I left a box down for 3-4 days would not have had a job... UN-believable
