WALK IN FREEZER SUPERHEAT TOO LOW
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- เผยแพร่เมื่อ 5 ก.พ. 2025
- This was a call on a walk in freezer that was not getting cold enough, i found that the expansion valve was not working properly and caused the superheat to get too low. I made a temporary adjustment and got the superheat higher until we can submit a quote to replace the valve.
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I love how you look at the BIG picture. You are a very humble person and I admire that. Also, I like how you show the whole process in your videos. Keep the videos coming they are kick ass!!
thanks bud,
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I like this video and explains
TXV all the way in, all the way out, and back to the middle. Excellent procedure to (try to) clear the valve.👍
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Thanks for showing the flashing sight glass Chris.
And I love the big picture diagnoses.
I wish more techs used the same approach when diagnosing.
My favorite is the guy who tells the customer it's going to be a quick fix cause its just a bad fuse. He acquires said fuse and to find a bad transformer or other component .....
Customer will never have confidence in that tech again ...
Thanks for making your videos public and sharing your knowledge and approach.
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I enjoy your content just don't stop being detailed while you work explaining your thoughts process. Thanks
Sooo many guys think that ice on the compressor head means that it's flooding back. Thanks for clearing this up!!👏
Nice work! I like the txv body’s with thread on power heads. The sporlan kit has saved me a lot.
I've been binging your videos. Thank you for keeping the beer cold and the food fresh, plus even though I don't understand a lot of this I do understand about the smaller stuff you talk about. Thanks man.
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Good morning from Greece Chris.I have some castomers here that they have some junk equipment like this and it's a pain in the ass, but we're technicians and we have to fix them to,with the lowest price always! Keep on the good work my friend.
Thanks for watching!
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Thanks!
I agree with you, there is some moisture in the refrigeration line and ice clog at the metering device, the line should be vacuumed and refilled by the fresh refrigerant. I like your video, you did a great job.
We all find the brands/models that we have good experiences with.. Thats what we stick with because we can say with no reserve that they will do the job and serve the client well... Thats true of whatever business you are in... And the way it should be.... If you only sell what's cheap or what makes the most profit right now... That a recipe for disaster... Typically a client will trust you and when your recommendation proves true... You keep that client for life.. and equally important... they send referrals... There no better business than repeat and referrals... The cost of client acquisition is free (or cheap) and they are usually the best clients.... Once again... This is true whatever line of work you are in... Thanks for the content..
Hey Chris! Love your videos and professionalism. Your customers could never question the approach you take. The videos prove it. Great tool for any tradesman to record his or hers service call. Cheers from Canada 🇨🇦
Nice work brother. Ive never thought about running the adjuster in and out to free up a valve in a pinch. Awesome video.
really similar to valves i deal with in plumbing/water lines at work, it is called "exercising the valve", which oddly enough an electrician contractor taught me for breakers, but he said plumbing is same, they all like to be turned on all the way and turned off all the way- back and forth a few times- at least once a year, or they get gummed up or rust or whatever, so at least once a year turn whatever valves you have folks.... it has worked wonders for the old building i take care of, saves lots of replacement work and when a pipe breaks, the valve actually shuts off the water
I love to watch your video. I'm learning HVACR now. I wish you can post shared 2 video everyday . so I can watch and learn more HVACR . Thanks you for shared
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It was great to watch this and i pick something up i never would have thought to do. Thank you for your time and experience
All this behavior makes perfect sense. You had a little extra oil in the discharge from the low superheat and gas through that stuck txv. That coil was nicely insulated with that extra oil. Damn good get it done method of cranking the valve spring to both extremes, excellent work.
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the box temperature wasnt satisfied because txv wasnt feeding a solid liquid once he cleared a glass the temperature should drop, but it would still be flooding compressor,
and shorten its life.
very nice diagnosis! I just wish the doctors would be that through
you can tell it's happier... it's building frost after the expansion valve, and not up at the compressor. thanks for sharing!
What’s wrong with negative superheat??? 🤣🤣🤣
I prefer the Sporlan TX Valves too. And I agree with you about the wonky placement of the liquid service valve. I suppose that manufacturer installs filters that never need to be changed, so no need for a King valve then... good video, thanks Chris.
"filters that never need to be changed" that's a good one!
Just like you don't have to change the oil in your lawnmower anymore, just add more when it gets low.
I still change the oil on my small engine equipment, and I bet I won't have to buy one for another 10 years (that's the secret, they can't sell more "durable goods" if they don't break, so they build them to break right after the warranty is finished!)
You could always use your pinch off tool on the liquid line after the receiver outlet if you needed to change the drier. I bought one after doing a pressure switch on a Mani and have used it at least 15 times that year, mostly to weld taps onto reach ins while they’re running because the saddle taps are worthless
I've seen one of HVACR VIDEOS vids where he used a saddle tap on a piece of equipment that didn't have service ports.
I'm not a HVACR technician, but I do auto repair so I do have the occasional contact with vehicle AC systems. IMO, saddle taps should only ever be used to remove the charge from equipment that doesn't have service ports, and never left in place. That rubber you wrap around the pipe will degrade, and those screws are all that's compressing the rubber to seal it against the pipe, and a dirty pipe won't seal as well, and... well a leak is basically inevitable, and likely created when you install it. So it's best to use it as little as possible, and never left in the system as a permanent fitting.
If I was working on something that didn't have service ports, and I needed access, I'd use a saddle tap. Once I was done, I'd recover the charge, then sweat in a pair of service ports. I don't like the idea of a pinch off tool on copper lines as it puts the copper thru so much stress that I'd never trust that section of pipe again (work hardening and micro cracking are likely at the corners of the pinched-off pipe). As far as I've seen from watching many videos, when I see a pinched off copper line it's also sweated shut. That's acceptable for long term use, but I only trust it because I've seen them that way from the factory.
Even in plumbing saddle taps are a common source of water leaks, usually behind the fridge as some DIY'er decided that was the quick and cheap way to get a water line connected to the fridge's ice maker. The leak can happen any time from under a month to a couple years after installation, but it WILL eventually happen.
Another top notch diagnosis and procedure, brother.👍
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Good boy I like techs that know how to make a bill.
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Congratulations you are a very knowledgeable technician, and well explained. I hope you are been taking care $.
I really wish more residential equipment had adjustable txv’s.
They do from my knowledge. But it's not a need to adjust them
Thanks for sharing your wealth of knowledge Chris! Its rare to find honest and knowledge Tech's in this field and that's a fact.
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No I am other tech that l don't like alco valve you can't take apart like a sporlan .Great video Chris.
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Great instructional video Chris, Great diagnosing, keep up the stellar work bud!
Thanks bud,
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Your channel makes me want to go look for another company to work for. The company I work for only does residential. I want more variety!!!
I know right! My last day at my residential company is this Thursday, will be starting at a commercial, refrigeration company friday.got 5 years in residential
excellent videos , you are teaching me so much. thank you
Thanks for the video it's really a good explanation.
Can a superheat cause the high side of the compressor to the oil return pipe form ice when the door of an industrial coldroom open?
How can I deal with this same problem ?
Good job man. If the compressor short cycles for any reason, the contactor is feeling the pain.
thanks
straight forward, good learning exp.
i love going in walk ins with you. good job bud
man, you got some cool diagnostic tools!! great video as always!
When you checked the copeland, did you check the resistance on the electrical terminals to determine it was good. .
Thanks in a million. Great content.
man your videos are so helpful thanks all the time
Great video share ! I appreciate the time it takes to put the all of this together sir !
Very good job you my friend keep it up nice information thanks looking forward
If one of my guys had run that bulb like that he would be meeting me in that box! We would be discussing his career options!
Thank you for sharing information
sometimes i ve seen low superheat at compressor caused by coax heat exchangers leaking internally. liquid dumping directly into suction line.
Impressive service
Thank you for the video. I still didn't catch one thing that you did. You added refrigerant based on side glass, but is there no leaks. Why did you see flashing glass. I am new tech. Maybe I missed something.
Excellent video and job 👍👍👍👍
“I’ve confirmed that the thermostat is working even though I don’t like that style it’s a piece of junk”...I’ve been there lol
add a ball valve in front of the drier.it`ll be your king valve
ball valves are life.
Great videos man! Love to see passion for the trade.
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Sun ding liquid through the headers or scrolls can ruin a compressor as well. You want 100% gas going back through the compressor discharge. That’s why we take subcool and super-heat. Same goes the other way. If we have a sub-cool that is off with a flashing sight glass we are ruining the TXV since the TXV needs 100% liquid to work correctly. When gas goes though the TXV the valve body will jump more than needed to. It can destroy the TXV. Especially the way they are made these days.
Thank you .you just answered my question
Great video guy, I know you put in a lot of time and effort into making these and it is appreciated. I wonder if you have ever set up a
white board and explained how the refrigerant flows through the system. This may not be your thing but you do have a good teaching skill. Working with auto a/c is so much easier as in less parts and it's just basic. When I'm watching you work with these systems I'm like damn I cant keed up with all the stuff that's added. Defrosting and a/c power and all these switches everywhere. Lol. I'm starting to pick it up though thanks to you.
Good solid work very helpful
Very good video man!!
Cool video very educational
You are the best ❤🙏🏿
Hey, I just heard that the SMAN380/480 will link up to measurequick now.
yep that is confirmed!
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Good stuff bro
Absolutely awesome videos and recaps. I been in the residential AC 5yrs When I worked with my old boss we did single evp and condensers. Recently got a lead to go see a customer. He had a parallel Hussmann cabinet. The guy who worked on it move so he says. Had 4 compressors. 1999. Only one compressor was working, he wanted a new and wanted to replace one compressor, 3 were bad. Customer gave me a hard time about adding freon, 55lb system 404A. It had 4 cases and one walkin chill box. But anyway. Do you have any videos on multi compressors systems or multi evp running off of one condenser. I couldnt find you email, the website wouldn't load
Your voice sounds like the lead singer in the band Sister Hazel ... Just an observation ... The song is All for you ... Good vid also ...
Ha Ha I loved that band and song, too bad I cant sing to save my life.........
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I'm a newbie at this, so confirm if I'm thinking this through correctly.
The flashing sight glass was because the faulty expansion valve was flooding the evaporator and suction line with liquid refrigerant. With too much refrigerant now on the suction side, the liquid line receiver ran low on refrigerant. Is this correct?
That is correct. Most freezer TXVs are pressure limiting, so as the evaporator is flooded and the liquid refrigerant is flooding back to the compressor, it fills the suction line with refrigerant causing the system to appear long on charge when in fact its perfectly fine.
I was wondering the effect of taking loose the bulb of txv to increase sh and open valve or even heating bulb.
Do thermostats have a built-in differential, in this case 6F?
I’m not sure if it’s been mentioned in the above comments so i apologise if I’m repeating anyone else. The equaliser line is positioned incorrectly, when the valve & orifice are sized correctly (hopefully always) that will cause you problems every time. Obviously there is some liquid Cary over through the equalising line and when your bulb is positioned down circuit from that your creating a false superheat causing the valve to shat down equivalent initially then behave IRAtic with the fluxeration and what not.
So there was potential floodback to the compressor but the TXV was only feeding vapor? Is there something i am missing cuz that seems wrong..
Hello just a question, is there any reason you put the other pressure probe closer to the evaporator instead of putting in closer to the condenser? I see you had a T
Very helpful video, thx.
Thanks for the info .
Great video
Why does the ceiling of a walk in freezer box is always frosted? Is it bad door gaskets? If not what other things you look for to cause frost in the ceiling of freezer hope it’s not a dumb question?
Great video
The oil concern youu had. About compressor did you charge with oil?
Hi Good day sir..i Have learned liquid is worst enemy for compresure..but i can see u adding liquid to the suction line..may i know is it correct...Thanks for video..
I’m a newbie, and I have a walk-in cooler that is running off a halfhorsepower Compressor and it does not seem to get below 50° the charge seems fine, should I adjust the TXV before trying something else or should I get a bigger condensing unit
Have a 404a reach-in freezer the evaporator is icing up real bad I think it's the TXV
Good job
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Nice videa buddy!
Sure would like an opportunity to work with you guys if I come to cali!
Since your recovering the charge, do you plan on installing a king valve at the accumulator so you can change the drier in the future?
What else to say than excellent video!
I understand the industry likes to see a compressor superheat of 10 plus or minus a couple (F). The system SH is measured from the suction line 8 inches or so before the suction input of the compressor. What system superheat would you like to see as a minim?
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1.9° subcooling you mean? In the suction line
What size reefer wrench do you need for the TXV adjustment screw? Is it 3/16ths? Thanks for the videos.
Hi, Chris, just watching your video and I think I’m having similar issues wit subway sandwich maker , R404 and pressure looks good, but temperature is staying at 47 , 35 low 225 high condenser coil is clean , made turn few to the left and more to the right , but no changes on pressure at all, took out all refrigerant and weigh charged of 25 oz. But temperature maintains 48 degrees, would it be the TXV ?
Thank you in advance!
Have a new WI Frz installed in NOV 2020. 2 weeks ago I got my first call saying box temp 20°. Bubbles in sight glass so I cleared it with 1lb 404. My diagnosis was that whoever installed it did not properly charge it and are just now seeing a problem due to higher ambient temps. I've done a leak check as well. Am I on the right track?
Can you use Pinch off tool to change the filter drier without have to recovery?
yeah you could but it will look like crap
Do you do the same calc from ac to get that target sh ? Thanks
Can you ad it to your next video?
Hello question, my country is mostly summer, I have two choices of TXV, one with 4 superheat and the next with 8, would the 4 produce cooler air at the evaporator than the 8?, It`s r134a
Why would you think its under charged when it's freezing back to the compressor. I would have gone straight to the tev ❓
Sir I requested you to make a video on plate freezer
Why didn’t you check the sub cooling ?
Thank u so much that how I learn how to fix my equipment in my store save lot of money
How do you know what target superheat to go for?
Why would you go back with a flare style drier? Just preference?
Yeah preference, I'm lazy and dont want to have to bring my torches up on the roof next time to change the drier......
Any ideas on what unit I can use for a food cart. I want to build a walk in freezer inside of it. I am a plumber and have done some hvac. By no means am I a pro!
?
What mfg and model digital thermostat do you recommend for medium temp systems (+35° holding temp).
Good Jobb
@HVACR VIDEOS I have a question, I have a heat pump that is not keeping my house cool. I hade someone come out and I have a low super heat, and flooding the A coil, I have the correct charge, clear site glass, and clean coils. the condenser is discharging warm air, the tech could not figure it out, any recommendations. ps love the vids
Dave your residential heat pump has a sight glass? I did not know that would benefit the equipment.
Could it be the txv?
@@whitesheatingairappliancer7101 installer added it wean he installed the system, he said it helps diagnosing future problems. I thought the same thing, but It didn't cost me anything for him to add it that I know of
@@Josh-px6xb I don't think I have one. I think its a orface tube.
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i have a question. We have a quadruple-door Supera freezer that has been running a lot colder than it is currently set to run. What would be the main cause of this?
Hi Mister
I have wall in freezer is working + 10 F have to work -05 I have manifold regular yellow jaket hi presusure 325 psi on low 20 psi.
What presure is normal on Hi?
What presusure in low?
Thanks for help me
Why suggest changing all of those other parts when it seems that a TXV and contactor change out will do the job?
James Bowie longevity!
So the other potential issues don't come back to bite you in the ass after repairing the immediate issues.
@@akhermit5213 A number of those items were a case of "I don't like this particular brand/model". To me, simply not liking something that is working OK (such as the thermostat) doesn't justify replacing them, but it's his customer.
@@James_Bowie Sometimes OK is not good enough. I agree, it depends on the customer. After the repair, the customer not having issues for a long period of time is the goal. If I foresee possible future problems, I will proactively pursue them, rather than take the chance of the customer being unhappy with my work if one of those items fails shortly after I repair the obvious issues. Everyone has different views, but personally, I try to improve equipment when possible, and keep the customer as happy as can be. A customer that has equipment in good working condition is a happy customer. YMMV Have a great day!
They get a second quote and that guy says the TXV is working fine, temp controller and solenoid are working fine, the contractor is dark but it working. So, the client doesn't want to spend a thousand bucks if he doesn't have to. If it keeps working what the client feels is fine then they assume you were wrong or trying to dip them off. A month to three later if it acts up again and the client uses garage logic and pegs you as an over do it sort of guy. How do you counteract client misjudgment like I just outlined above? My outline is a common occurrence in misjudgment around my part of the country.
I agree that they will often say but it's working......... all I can do is give them my honest opinion and let them make that decision.... luckily at this point and time i have a very good customer base that trusts me..... i say me because they often don't trust my employees and that is something i am working on....