CARRIER AC WITH RESTRICTED METERING DEVICES
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- čas přidán 29. 08. 2024
- This was a no cooling call on a Carrier package unit that had multiple restrictions in the metering devices, I defrosted the unit and submitted a quote to the customer.
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Came across this same unit today,icing up right after the drier,pulling into a vac...new drier time
I can assure you that you r a phenomenal technician. I appreciate watching all of your videos. I am a better tech from watching videos like these this past year. I am a master hvac contractor all the out in VA and u r making a difference all the way over here.Thank u sir!
Thanks so much!
Ive got 2 of these units at my facility. One of them mustve been having this issue for years. I havent had to check the charge and it seemed to be working fine until one day the evaporator was frozen solid. Pulled the charge and it had 3 extra lbs of r22 in it. vacuumed it down to 500 microns and left the vac on it for a day. Put the correct charge in it and immediately saw the problem was the metering devices. Hoping they let me replace this unit because it looks like a pain to replace those😅
Man. Your videos are GREAT. I watch all of them. I left a hospital with all Trane equipment to work for a University that has all Carrier equipment. I start Wednesday.
Getting a great head start, because of you. Thanks a lot.
Well if u get these just know that the econ is always bad on these water leaking into the circuit board, they added a shield but nope that didn't help, also these have split coils like some trains difference is the train units split half way
keep thinking thx man. Thx a lot
I gotta say, watching your videos helps me with a lot of aspects. The pride you take in your work, your diagnostic procedures, and the thorough way you operate has helped me personally working in the IT field. There is always something to be learned from everyone. Hope you are having a great weekend, thank you!
just got on the service side two months ago. I was an installer for about four years. love your channel. Also you talk fast enough to where it’s not boring and slow enough to where I can understand everything you’re describing. Thanks for the great content, it’ll help for future calls
Watching these videos while I'm entering my courses for HVAC-R really help me out when it comes to applying what I learned. When I first started watching I would be like "what is this man talking about", lingo wise etc. Now when I study on my terms and understand how the unit should operate I apply that to thse videos and it's amazing how the information retains itself in my brain. Thanks a bunch and keep making these videos!!!
I like the videos when show how you're "wrong" because I learn more and better.
We had a similar situation here in Georgia. Carrier RTU but a 10 ton with one 5 ton Curcuit restricted. Did not want to repair. We told them we would just let it run in the good Curcuit till they mad a decision . Called another company hooked up the Curcuit and caused a leak and killed the compressor . Lucky we had service invoice and email to clear us. Building owner just had us replace the unit.
That ice on the evaporator coil could indicate multiple things and you can’t assume nothing until you inspect everything (filters, etc.) to diagnose the issue.
I have been in the field less than a year and work for a local company in town and have changed a lot of TXV’s that get clogged on units the company has installed that are less than 3 years old. My first thought is that the installers are not brazing with nitrogen. And sure enough they are not and not even pulling a vacuum properly and they don’t even install filter driers.
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Would like to see how those metering devices are changed...
It's a pain in the ass.
As would I. Last one I found I ordered the entire evaporator
Probably very smart. saved u alot of time & headaches which in turn saves customer money & customer gets a better job overall.
Greetings from Western North Carolina... There is a method to free them up. That sludge someone mentioned gets in the accuators and gums them up. With a few hours and some torch skills some flush and a lot of nitro you can actually get them to clear up and start metering properly again. Pull out all your refrigerant, purge nitro and heat up the accuators. This and purging some flush will get them unstuck. If yall ever think you are experiencing clogged accuators, you can Performa freeze test to confirm. Pull L1 off your blower and start the system. Without a blower running your coil will begin to freeze immediately. Watch the freeze pattern. If some cells of the coil start to frost but others don't you will know strait away which accuators you need to pay closer attention too. Good luck yall.
Love your videos from Phoenix Az. Keep them coming. Thankz...
Hey Chris. Hopefully in your Service Report you put in the verbiage that doing nothing could possibly damage the compressor that they had put in. That way you would be off the hook if something did happen. Great video as always. Enjoy the rest of your Sunday. God bless.
How cool I asked you a question in a email about this same problem I have and you came out with a video!! Thanks Chris!!!
Funny how that works huh! I will be going live on CZcams this evening 9/23/19 @ 5:PM (west coast time) to discuss my most recent uploads and answer questions from the Live Chat, emails, CZcams comments, and Facebook comments come check it out if you can czcams.com/video/4rNW597Gy7s/video.html
chris thanks for the help has always
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A thousand thank you to you man i've got same problem but brand that i got is rheem A\c split
Suction is low 30psi and discharge is 270 psi
So then i removed the fixed orifice to chekck it and i found ot that the filter inside is already rusted.
I changed the fixed orificed and guess what man?
Its running perfectly pressure and temperature is perfect,subcooling and superheat is perfect
Thanks a lot that you shared your knowledge.
Sorry with my english but all thanks to you😂👍👍👍👍👍👍👍👍
"Big picture diagnosis" - great quote! I'm gonna steal that!
That is what I preach to everyone!
@@HVACRVIDEOS you should trademark , Chris , for real , not even kidding , mate .
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Thanks for uploading this, we have MANY units just like this.
My owner is old school; big on repairs, replacement is a LAST resort.
By far my favorite channel to watch..l find your diagnostic techniques very helpful and informative!!
Nice diagnosis. To bad the customer will run the new compressor in that condition. Very easily could ruin it, and then they will be looking for warrantee on it. Thanks for the excellent video's.
This should help with my job. The restaurant chain I work for has quite a few of these carrier units.
You are very welcome. Always great to watch the videos. AWESOME job as always. I have worked on Carrier alot and you are correct in summer its the metering device or in winter heat exchanger or gas valve. I will be away starting tomorrow for a little while going in for surgery in early am. Be good kid. HVACR ON AMERICA!!!
Good luck Ray!
Thank you very much. We will be in contact with you. Be good.
This is typical Carrier. I’ve replaced four of these manifolds on the evaporator this year. It’s contamination from the factory.
I’m extremely thankful for your videos
Im thankful you enjoy them! I will be going live on CZcams this evening 10/14/19 @ 5:PM (pacific time) to discuss my most recent uploads and answer questions from the LiveChat, CZcams comments, Emails, and Facebook comments come check it out if you can. czcams.com/video/tB11ZTSHhhE/video.html
Here in Kansas RTU usually are replaced every 10 years, It is also a very competitive market, not including that lot of franchise business purchase their units threw their national account. I usually make better money doing service than replacement
Same here, I will be going live on CZcams this evening 9/23/19 @ 5:PM (west coast time) to discuss my most recent uploads and answer questions from the Live Chat, emails, CZcams comments, and Facebook comments come check it out if you can czcams.com/video/4rNW597Gy7s/video.html
Always look forward to watching your videos. I live in Norther California and hope to meet you in person one day😀
Good stuff as always brother. Haven't commented on the past few but I've watched them all man keep the good stuff coming
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👍🏼 Your video skills are just fine. Tnx for sharing your great videos and commentary.
Thanks for watching, I will be going live on CZcams this evening 9/23/19 @ 5:PM (west coast time) to discuss my most recent uploads and answer questions from the Live Chat, emails, CZcams comments, and Facebook comments come check it out if you can czcams.com/video/4rNW597Gy7s/video.html
Please keep making videos I’ve learned allot thank you 😊 and God bless
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Nice detailed video Chris! Thanks for your insight.
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Hey man...!! I always watching your channel... I'm also a a/c technician in UAE.. your video is very informative..👍
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Had the same issue today. Spent all day replacing a grounded compressor. Only to find once i got it charged back up we had plugged metering devices too. Grrrrr.
Great job again like always
i shared your channel on FB page group i hope you'll get more subscribers. you are really awesome man!
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Big fan bro watching from Trinidad
it's only halfway iced of that's funny initial thoughts maybe dirty air filters so limit airflow can icing up the coil 0:44
I had the same issue on a multi stage Lennox rtu. The txv was frosted on stage one.
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First time I was able to guess the diagnosis before Chris announced his. WooHoo! My reasoning followed Chris' reasoning. So maybe I'm beginning to catch on or I just got lucky, time will tell
It was in the title dude 😂
@@lauej Never read that, doesn't count. lol!
I’ve seen many times when you lose a condenser motor the high head pressure clogs the metering device. Always check the motor bearings to help prevent this.
That evap coil looks brand new lol down here in Florida after a week you will never see an evap that clean lol
Iv had them clogged with a wax type substance. Sometimes nitro and mapp gas torch helps but it's a gamble
that's cooked off/coked "oils", it was ran way too hot, low on gas, clogged cond. coils, bad fans, etc.
while I hate to mention they should have safety devices to shut down and alarm if anything is off, it's true for longevity of equipment, but at the same time systems that don't break deletes work and the electronics are all chock full of early failure junk, which creates more issues, money wasted an overall more global warming in the big pictures from bare materials to end product and repairs.. ;)
I don't know if it's just the way it looks on video but I saw two big deep corrosion lines on the far right heat exchange tube that look like if you rub them they'd fall out.
In dallas TX, we have alot of unit that has same problem!
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The customers are allways take the lowest cost option. It dosen't matter what it is. I do repairs of measuring equipment for opticans. Sometimes they have equipment that is about 15 years old. But they buy the repairkit, even if they can get a more accurate system. It is the same thing, rapair costs a quarter of the new unit.
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Mucho bueno Chris 💪🏼💪🏼👍👍👍
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Thanks for sharing the video.🇵🇭🇸🇦👍🏼
I learn something everyday :)
veryvery good!
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Hey Chris, and all the other cool people here.
Is this more prevalent with R22?
I know that discharge temperatures get out of hand very fast when high head pressures, low suction pressures and high compression ratios are present on a system.
And then the oil produces gum which solidifies in the metering devices, or becomes solids that the liquid line filter gets.
I have seen this on badly designed abattoir boxes where the evaps and condensers were undersized, so a crankcase pressure regulator had been installed to get the condensing pressures down and the evap pressures up. but then you increase the compression ratio which catches up with you.
Gummed up liquid line cartridges and compressor failures due the acid produced by the oil breakdown under these temperatures.
R22 seems to point out the two issues I mentioned in line 2 very quickly.
I would not mind an objective reply to this one, as it is something that I experienced and cannot unsee.
Thanks for the awesome channel Chris, I am enjoy the experience of what you share immensely.
Kind regards,
Duncan, South Africa.
Dont change anything, keep doing what your doing! I love your videos and you are my favorite channel on youtube!
Thanks
once the customer declines repairs, contact Drain Addict to help push the poop on down the line!
Man I know the feeling...Restaurants dont ever wanna here the replacement word..Always just repair it
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I love the 1.5 inch static drain haha guess they didn't read the 3 in min
Just had 2 of these units side by side do this same thing
They should use more chillers they do the same thing in Phoenix not in Florida
Have you ever seen a funky freeze pattern on an evap coil and it's NOT an obstructed metering device?
No one recommended a triple evacuation. Interesting.
Nitrogen is a life saver(and creator).
Hi Chris, noticed you referenced "subcooling" in your refrigerant circuit diagnosis. I have been inspecting a lot of Trane Voyager equipment largely with FM (short orifice) pistons and a few TXVs, but struggle in diagnosing restricted metering devices concretely as they have similar frost patterns and SH/evap temp pressure symptoms to a low charge condition. I have been encouraged to reference subcooling to "prove" that the unit has most or all of its charge, but struggle in that these aren't true measurements and therefore a crude way to diagnose. I'm speaking from a relative lack of experience, but the only solid indications I can find for "high side conditions" would be discharge pressure against a charging chart derived from load conditions. Again, I realize condenser and discharge pressure are closely linked, just curious your thoughts.
Good bro 👊
Someone didn't run nitrogen when they did that compressor guess how I know
zack9912000 How do you know?
Exactly what I thought. Copper oxide turned to scale and plugged up orifices.
@@Frolo-H it's common practice to purge nitrogen throughout the braze joint to prevent the inside of the joint from crystallizing which will scale off and in this case clog up the metering device.
Same as when TIG welding, we back purge argon throughout our piece to prevent the same crystalline structure buildup
or it ran low on gas from a leak and cooked the oil off, thus killing old compressor, pretty much, trash the whole system end to end and start over ;)
no low pressure cutoff in there? cough cough
@@throttlebottle5906 there was nothing wrong with the compressor. A blocked orafice in a metering device is responsible for the high head pressure and low suction pressure, also as he showed in the video, the pattern of the frost on the evap coil is consistent with a metering device clog up because you can see heavy ice buildup after each metering device. The charge was most likley decent but not purging nitrogen is what most likley led to this failure
Good vid. Throw in a Txv & be done with it.
good vid bud
One question I have is With R22 becoming illegal and unavailable starting in January, Won't the customer's only choice be to replace the whole unit? I would think that all R22 systems once they go low on gas should be labeled as unfit for repair due to the gas becoming illegal in January. I have been wondering about this because I see the HVAC techs that I watch on here still fixing R22 systems that need gas and seemingly not telling the customers that they have to replace the unit because the gas becomes unavailable starting in January?
Actually that is a major misconception R-22 will not become illegal it just wont be allowed to be imported into the US and or new R-22 will not be allowed to be made anymore. But the suppliers and manufacturers have stock piled enough to last for many years. The price has actually gone down too. I will discuss this more on my livestream tonight...... I will be going live on CZcams this evening 9/23/19 @ 5:PM (west coast time) to discuss my most recent uploads and answer questions from the Live Chat, emails, CZcams comments, and Facebook comments come check it out if you can czcams.com/video/4rNW597Gy7s/video.html
Check the coil and compressor ratings. Its possible to convert an R22 system into a 410 system.
I have see hundreds plunged up
Good find, would you ever consider just Retrofitting to a TXV? I know it won't be per spec, but for an older unit, maybe it's OK. Good videos.
Yeah but carrier doesnt makes a kit for that so I would gave to come up with a distributor, and txv...... I would do it if I could figure out all the calculations!
@@HVACRVIDEOS Yes Very True, since it's commercial, you never want to create a situation where it will reduce the capacity. Probably time consuming to research if you want to do it right so I totally understand. I've done it on residential where Carrier has a similar unit that is higher SEER that uses a TXV and "steal" the design. Still won't be perfect, but it seems to work based on the numbers. Good luck, yes looking fwd to the video when you get the job.
Hope we get a 2nd vid since thos was very short in comparison! Haha.
If they approve the quote I will make a repair video
At 3:00.... that compressor is there because the old one was murdered by this issue.
What app do you use to get the diagnostics reports? Great vids keep up the good work!
Sort of hopeless since the whole system contaminated with boogers. I guess you can stick back in multiple filter - driers to catch what you can after change-out. They depreciate their RTU after like 7 years probably.
Problem is you live in CA...everything has to be the highest EER available...
I have the same fieldpiece gauges. How did you get the screen on your app on the phone to come up like that. Mine is a square with all the info in it. I Appreciate a response if you can.
Is there a residential HVAC channel you recommend?
Maybe nitrogen & drier are missing
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What typically plugs up metering devices?
@Chris ... Who is the customer at such chain restaurant sites: the landlord or the tenant?
Tenant
@@HVACRVIDEOS OK, then from what I know of tenants in shopping malls, they never want to shell out for replacements -- they are content to just keep on patching things up. One explanation I was given was "I'm not going to put in new infrastructure because I may be out of here come the end of my lease" (i.e. at the next rent increase).
Yeah I have heard that before too, but they will end of repairing the unit when their budget resets, I doubt they will replace though it's just too expensive to replace units in California these days. The government has too much red tape and it ends up costing 3-4 times what it would cost in a less liberal state.
@@HVACRVIDEOS I believe the technical term for that is To Be Californicated.
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What are the telltale signs of it being the metering device rather it being low on charge? When I saw low charge and the evap icing up I was thinking low refrigerant. Thanks in advance!
low suction. high subcooling - because liquid is being held back in condenser. high superheat - because your not getting enough refrigerant in to evap to cool compressor . low on charge is both pressures low with no subcooling. subcooling is the key.
OcRefrigeration , Hvac & Electrical Video's. Thank you Oc, great explanation.
Can there be heat exchangers that don’t rust
Mr.Johnny boy. Stainless steel maybe.
I remember asking that. The answers I got made perfect sense. A Shell is made thin as possible for Efficiency of heat transfer.
Stainless is a brittle metal. It does not transfer heat well. It also expands with temperature more than most.
Making it thin with temperature expansion leads to cracks. Although it may be corrosion resistant it otherwise breaks itself apart.
That is why they don't use it.
Well the issue is a poorly running air conditioner on a package unit destroys hear exchangers. The excess moisture blows off the Evap coil and onto the heat exchanger. This is because in a package unit application the Evap coil is up stream from the heat exchanger. Always confirm duct is correct then keep the ac running the best you can. Keep drains clear and blower speeds right and your heat exchangers will last the 20 to 30 years they are supposed to.
Bet that unit would smoke like a freight train if it ever has to start the second stage heat with all that grease stuck on it.
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👍👍👍
👍
Looks like a bunch of hacks installed this by looking at the flex gas line and the condensate drain.
The flex gas maybe a code in his state because of earthquake but yes that 1.5 static drain is a joke
Could you use a pipe cleaner to clear the restriction?
people don't care and just smash junk in near warranty end and don't care or hope it will flat fail and be replaced.
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Tomorrow is fall
#401 thumbs up
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Lol 😂 no one cleans or maintain filters