ReplyThat's funny!Originally Posted by Rhinohead
Regular Guest
So after running the head pressure up and seeing better TXV metering-did the clog clear permanently? And are we talking oil clog or something else? How has it been performing? Is this on the ALA- N Coil?
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That's funny!
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2 Tim 3:16-17
RSES CMS, HVAC Electrical Specialist
Member, IAEI
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Hmmm...we have an inside guy saying it's a run of mischarged bulbs.
I used the fan disconnect trick on one yesterday - but I thought I was forcing the valve to open a bit...not clearing distributor tubes.
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Professional Member
Are they using Sporlan valves? We've had major problems lately with those valves on Rudd units.
Professional Member
I think Trane also had this problem about 2 years ago. My owner had 3 changed in like a month and a half..... He said Trane said it was a bad batch of TXV's.
Professional Member
How much superheat do we charge the bulb to? Just weigh in 0.00000000000000012 oz?
Professional Member
The replacement valves they are giving us are Emerson so i beleive they know they have a problem.
Regular Guest
Our bad valves were Danfoss TXV. I believe the replacement bad ones we installed (also failed) were Danfoss. Expecting a shipment tomorrow- it will be interesting to see what brand and how new off the line they are...
Regular Guest
Then you haven't had to replace a York Commercial TXV that has the 12 or 15 tube distributor as part of the valve. Can't replace the valve without the distributor and all of the lovely distribution tubes interlaced with the 2nd stage identical valve and tubes.....that IMO is THE DUMBEST DESIGN EVER!
Professional Member
Are u a retard or something? If u dont don't know how to charge a unit then ur a hack and need to gtfo this site.
Regular Guest
I believe he is referring to charging the sensing bulb on the TXV....obviously one cannot charge this bulb in the field as this is done by machines at the manufacturer. I believe his question was rhetorical and funny too...js
Professional Member
Yes, I believe he was being a SA now that I think about it.
Professional Member
My local Copeland rep tells me that R-22 change overs require a filter drier right besides the inside coil. He says even if the outside unit has a filter drier inside it, it still requires a additional filter and that 410-a change overs are now a different story about the 2 inline filters being a no-no.
He goes on to say that many txv's are showing up with a sticky substance clogging up the orifices in the txv caused by small amounts of left over mineral oil or the flushing agent.
bb
Regular Guest
Having some Major issues with TXV's....hearing a lot about leaking evap coils similar to when Lux aire had a huge problem when the first went micro channel....the Rep gave us a line there was a bacteria that caused the leak....so my answer was..let me get this right...the condenser coil got sick on the way here....REALLY believable.....
got a 30 ton Carrier RTU on a job delivered (only 2 weeks late on a 6 week lead time) the comfort link control locked out right away....circuit A with no gas...piping looked AWFUL.....found a leak at the EVAP...not fun to find on a start up on a Friday....
Bottom line I think a lot of the manufacturers are having quality control issues due to the rise in demand and lack of supply.
Professional Member
mineral oil does not clog txv's.
Professional Member
Yes but r11 flush and those other bad word cleaners do, if not completely removed. Something happens with the combination of mineral oil and the flushes or just the flushes them selves and poe. I got from a Copeland training class. Tell it to Copeland. It was not my idea. They claim that they get a lot of TXV'S back with gooyie crap in them on 410-a change outs. I never had a problem.
bb
Professional Member
Ask your Copeland rep if he likes flushing the system out on converted R-22 line sets. He was not able to tell me what caused the problems in the TXV'S. He only said to add another LL drier before the evap coil to catch it.
Professional Member
Not big fan of txv valve just like ECM motor,to many fail for different reason,if u install by the book,purge nitro while braze,dons't mean txv not goona mulfuction !cost more money for customer and make u look bad if it is newly install!have few brand new txv mulfuction before,customer loss all faith on that product and make me look like a fool!
Professional Member
"Its hard to stop a trane" lol
Professional Member
But can make a good living keep them going
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