WHY IS THE WALK IN COOLER SO WARM?
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- Опубліковано 16 лип 2024
- Well I had another technician defrost the coils and he noticed that one evaporator coil was not cooling, lets figure out why.
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00:00 SPONSOR CARD
02:00 PUMP DOWN EXPLANATION
03:46 TXV SIZING FOR AWEF EQUIPMENT
06:11 TXV INSTALL
12:58 EVACUATION TIME
16:09 TOLD YOU I'D WIN
16:59 TXV AUTOPSIE
18:18 CLOSING WORDS
I really like your brazing style, it's methodical and precise. Sometimes I feel like I'm rushing myself whenever I braze.
Good job boss . Am in Africa watching you , you always give me knowledge and good skills .Don't stop what you are donig keep it up...... my mentor.
Got my first BQ kit because of you a couple weeks ago. That thing is the star of my truck stock now 😜
You mentioned you didn't see how the other coil was frosted up. It might be a good idea to have your techs take pictures, if they can to document things. Just a suggestion....
Nice little easy repair. Those are always welcomed and appreciated.....especially during the busy days of summertime. As always....great instructions on the what,why and how of it all. I don't touch refrigeration anymore in TX.....but i still love your videos and i want to keep my skills sharp and up to date. Thanks Chris
What does tx have do with
Great video. I like when you post videos of the work being done in addition to the explanations.
I sent this to a maintenance manager to show him the tear down of the TXV. Good shit man.
Nice vid, excellent work as usual!
Great Video. Thank you for sharing
Great job Chris.
No ‘80s synth montage when brazing? Come on, man!
lolol
Yeah I changed it up for this one, I did just find an awesome new 80's style synth group called "the midnight" their song "lost boy" is my favorite so far
@@HVACRVIDEOS : Don't mind him, I love the 70's, 80's and 90's!!!!!!!!!!!!!!!!!!!!!!!!!
I absolutely love the brazing tunes!
@@HVACRVIDEOS The Midnight is amazing! Good job!
Nice work. 👍🏻
Found 2 TXVs with failed power heads this month. One rubbed out, the other completely snapped off. Typical symptom on AC is LOW pressure and HIGH pressure at the same time. Stacking refrigerant in the liquid line / condenser but compressor suction is low. If you ever get a low pressure fault on an AC with a TXV, check your high side AND liquid line pressure before pumping nitrogen in checking for leaks!
The other symptom I've found is you get very high superheat, high return gas temp, and crazy high subcooling like 40 degrees. The high subcooling tells you the system is fully charged, and high superheat means there's no gas making it to the evap.
@@brnmcc01 True. Im more or less talking about you walk up to the unit and its in low pressure alarm or high, or both. No gauges on yet. I checked electrical on the switches first, then put my gauge on the suction to confirm low pressure switch was open. Then checked high pressure, was not low on charge. Went looking for the txv bulb for rub outs and it was dangling in the air. Other was a rub out, just swapped the head last week and its running great, These were 2 ton Lieberts and a 25 ton York Package.
If a piece of your OCD HVACR soul died a little bit when Chris didn't de-burr the equalization line after he cut it, leave a like on the video. Good diagnosis bud!
Enjoy watching your videos. I also think you’re using far too much solder on those joints. Would like to see you apply the solder to the backside opposite of the flame. I think you have a far cleaner and good joint.
Floating head pressure systems are interesting I’ve typically seen them with eev.
To say a Solenoid valve won't fail and is just a power head Just remember anything with moving parts is prone for failure.
great video 👍
Good vid. I don't have many txv failures, but when I do, I always seem to have several in a very short period of time. Then no more failures for a year or so. I find failures of some parts seem to happen in clusters.
There are people that don't purge during brazing so they make a lot of misery for customers and services
I hate tvx failures, most of our customers have small coils so it is tighter than .... however, the danfoss tvx wont go bad that often and the ones whe use have the strainer around the injector, so in a lot of cases only replacing the injector is enough
there's been a bunch lately it's because of covid, low load or the units were turned off entirely - txvs got stuck
@@rustblade5021 They sit on the shelf or in the van for over a year, no problems. Burnouts and no flush, failure to N2 purge and not heat-sinking repairs (enough) are guaranteed fails.
I have found 12 ton units right off the crane that were contaminated by factory in filter compartment by not purging Air with N2. It caused a warranty fix.
If there isn't one already, an App where you can look up the system you're working on and then symptoms/error codes where the App then brings up guides and/or videos on how to diagnose or repair the problem would be excellent. Something similar to what DiagnoseDan has done with his app for diagnosing and repairing vehicle electrical problems, I could see you doing it with all your knowledge mixed with someone who can write an App.
The man the myth the legend!
15:55 I am just into the video, so I am not sure if you fixed it or not, but the low pressure cutout switch wires were stretched tight around the compressor.
Boss always has me due solenoid and txv in that situation.
The engineers that design this equipment have never had to work on it
1:19 - What a laptop backdrop picture‼️
What tip do you use tu unsweat and pressures
The problem with changing the power head is it's about as expensive as the whole Emerson expansion valve. And you are taking a gamble that the valve doesn't have a restriction..
If I am swapping out a txv I am using stay brite 8 and will be done in 10 second's.
What tip and pressures you use
@hvacr what numbers do you use on ur oxygen and acetylene regulators.
Out of curiosity... I've been taking power head off and wet rag to cool the rest. Is this a bad idea? If you're building the valve, I tend to just leave it off.
Am I not doing this correctly?
Also did you replace the nozzle with the annoyingsnap ring? I always have a hard time getting the old one out when I unsweat. I started using the 1/16 part of my sledge just to open it up a hair.
Looking for better ideas
i like to cut the cap tube on the power head first. tons of pressure on cap tube the valve is bad and since its all getting replaced no harm. Or cut the cap tube and little to no pressure and its easy to say it was only the power head and you just saved yourself time and the customer money, Ive already diagnosed the bad valve so its either going to need the whole valve or just the power head.
Why wasn’t the 49° liquid line a concern?
I think it was just caused by the txv being so restricted that not enough refrigerant was moving through the liquid line. Or at least, I have seen that happen before.
@@BenTh17 that’s a good point. I could see it being so restricted that the refrigerant velocity was extremely low and just being cooled down almost to box temp.
What’s the brand of regulator on your nitro tank?
Couple of comments, liquid solenoid wasn't energised so how was nitrogen passing through evaporator while welding also you didn't lag the solenoid valve when you welded the liquid line into tx valve.
I used a solenoid magnet to manually open the valves while brazing... I don't understand what your asking about "lag thr solenoid" ?
I don't know what it is, but Rheem has been VERY bad lately for txv failures a year after a proper install. We've never had an issue with ADP (Carrier) coils though. Just a few days ago I condemned a txv at my second job, although that one is a 10-year-old TRANE system.
Would it be unprofessional to change the the solenoid as well?
With the receiver front-seated, you aren't going to get a true flow across the drier as there is nowhere for the nitrogen to flow on that side of the liquid line, correct?
❤️
They fail in Honda vehicles all the time. Same thing they just close down and require 3 hours to change
I've noticed this about Honda a/c systems but assumed it was just the individual vehicle.
You forgot heatblocking compound when you brazed the drayer off camera.
Great video, is there part number for the sporlan build a TXV kit you used in this episode? I do light commercial restaurant refrigeration and HVAC (less than 15 tons) - Looking at Sporlan Bulletin 122, on page 21 of the PDF, which kits do you keep in stock on your van? Does it come with that case you have it in?
So the bq kit actually is just the case and the labels inside of it, then you pick what components you want in it, so you get everything you need. Just tell your wholesaler to get ahold or sporlan and they will get you set up!!
Here are the part numbers for the Parker Sporlan series TEV kits. www.parker.com/parkerimages/Parker.com/Literature/Sporlan/Sporlan%20pdf%20files/Sporlan%20pdf%20010/Form%2010-546%20Q%20Series%20Case%20Options.pdf
Hey HVACR, ever get calls to repair vandalism? They came and kept dropping big rocks on the unit. Thankfully no leaks this time, just had to bend the fan guard back and it ran again. How often do you get called to fix vandalism?
Manufacturers thinking about service. Heh heh. Right. I've worked (albeit not HVAC-units) where the thing that always breaks, is in the middle of everything, and you have to basically tear everything down around it, and instead of a 1 hour job, it turns to a 8+ hour job. But who knows what the right-to-repair movement can accomplish?
I still have trouble with super heat and subcooling for different refrigerants ( mostly low temp) Is there a video you have on superheat and subcooling for low temp. I’ve been reading on it but I still don’t understand for low temps.
Would love that
You didn't wet rag the solenoid valve. Is that OK?
👍
Is reaming your pipe after cuts a thing or no ??
So it sounds like the TXV is like a carbeurator on a vehicle. that makes it make more sense as to how it works.
No where near the same. Not even remotely. A txv is more like a main jet in the carb. A txv can be replaced with a single jet. It's simply a temperature adjusted main jet. When the outside temperature is higher than normal the liquid pressure is higher which pushes more through the "main jet" orifice, in a system without a txv. A txv simply regulates the flow regardless of the outside temperature. With coolers, the outside temperature can be wide range.
👍💪❄️🇺🇸 Nice vid n information. Was that 15% rod u used ?
Yes it was
@@HVACRVIDEOS thanks Chris
Quick question for an apprentice, Can you change a strainer while the system is pressurized or must you pump it down prior, Thanks
Pump her down.
What, no retro 80's synthwave for the braising montage?
I love the work bro, but I didn’t hear any nitrogen.
👍👍👍👍👍👍👍👍
Do you have to contact the fire system monitoring company to put the facility off line before starting hot work in case you set off a smoke detector?
There are smoke detectors in the vents if u have to power them down u have to contact them first
He’s inside a walk in isolated from the air vents.
It's fairly easy to contact most monitoring companies and have them put the system in test. The drawback of doing that is then you have to have someone put on fire watch, and keep walking thru the building. If the place is huge, then that can require an additional employee just dedicated to doing that for insurance reasons, and sometimes it just costs too much by adding more man hours.
Is that bulb supposed to be on top? I thought for 7/8" sunction line bulb should be 7 or 5 o'clock?
it's a 5/8 line so its not as critical I will discuss this on my livestream this evening 9/19/22 @5:PM (pacific) come over and check it out ua-cam.com/video/yK1mrhVa9Bo/v-deo.html
Why didn't you seal all the leaks, evacuate the refrigerant, pull a perfect vacuum, and recharge the system when you know there are pieces of carbon and other big contaminants in the system? Is it because on older systems you will never be able to fix all of the leaks anyways? I am going to HVACR school at Ferris State University right now and it's really helpful to see how everything works in the field. I can say with utmost certainty that he is a good tech.
frost on the txv and capillary tubes, txv is bad or has fallen out of calibration. txv control volume, capillary tubes control pressure. corrrect? plus your hot liguid by pass to control surface temperature correct? Stay thirsty my friend.
LoL, worldwide it seems we use random objects to prop up the item we are brazing in, in this case a pipe cutter,,,, brilliant haha
you guys are allowed to vent refrigerant there?
not too familiar with 448a though. nice work
Remember to do preventive maintenance on your computer. My GPU was at thermal throttle 83c and after a repasting its now 61c (gtc 1060 6gig in TWW2)
Blow out your cooling fins (esp. the internals)! Good lord, the difference it makes. Made.
I don't understand much of what you said, but you HVAC guys are worth every penny. The complexity of AC systems boggles the mind. :)
i think he overheated the 1st weld
and the other ones too
I will discuss this on my livestream this evening 10/3/22 @ 5:PM (pacific) come over and check it out ua-cam.com/video/LWbSfJJl2gs/v-deo.html
Why is there 3 tubes on that txv?
External equalizer
Problem is. That is a Sporlan valve. It’s the new HX valve made in Mexico. It’s the new hotness. We are starting to build more and more of these at my plant. Lots of customers are starting to switch over to these txv’s
No that was an Emerson valve
@@HVACRVIDEOS looks similar then to our HX valve also made and Mexico and we are making in Washington also
Its 113 outside? what the F
I’m incredibly confused as to why your LLT is in the 50’s…
welding does not very well
In all plumbing videos the say "Use flux, everytime!" Care / can someone explain me why it isn't needed in this case?
Because that's Plumbing , thus is refrigeration. No need for Flux unless your doing copper to steel and you'll be using different 56% sliver .
@@wd8557 I understand what you are writing and I have another question. I just hold supposedly clean copper tubes and my hands get dirty, because, just because. And the op has condensation all around him. Water is not clean. Shouldn't that taken into account? Just purge it with fire, I suppose?
@@atsimas lmaooooo. Water is zero concern. Second when you are brazing your up to 1400 degrees. Now I use stay brite 8 for txvs. He brazed that's on him. But if I had to change that out. Stay brite 8, zero nitrogen and zero what ever he was using on the txv. Don't take this from me, I just work on chillers for a living and do simple refrigeration on the side to make extra cash.
By the way, Hello Chris. Again solenoid to stop high pressure liquid from flooding coil, when system is off. correct?. Has you tube sent that 3 million dollar bonus check??? welcome to america... I think trump might pulled the plug.
Govt wants to cut the electricity consumption in refrigeration but they want everyone to drive electric vehicles
you way are to over active with the torch mate