WALK IN COOLER ONLY WORKS WHEN IT'S WARM OUTSIDE
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- Опубликовано: 2 ноя 2019
- This was a service call on a walk in cooler that would only work properly when it was warm outside, the unit was actually low on charge and when it cooled down outside the head pressure control valve would bypass and there was not enough refrigerant in the system for it to operate properly.
Sporlan link www.parker.com/literature/Spo...
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I don't even work in HVAC so why do I keep watching these? maybe I should switch jobs
Do it , the industry needs more techs!
I will be going live on RUclips this evening 11/11/19 @ 5:PM (pacific time) to discuss my most recent uploads and answer questions from emails, the Livechat, and RUclips comments. Come on over and check it out if you can ruclips.net/video/Rm3XGBDxpOQ/видео.html
asbestosfiber Haha - same here - it’s like LockPickingLawyer - can’t stop watching!
@@snoopyjc check out A Canadian Beekeeper’s Blog, it's another channel that sucks you in lol
Good trade to get into. Learn mini splits if you're doing residential.
Always love your content Chris, every video that you post is helping me out through this trade.
Thanks for all the great videos that really help me I’m in school and I use ur videos to clarify what I go over in school thanks again
Excellent video, Chris! Thanks for making these videos, they take alot of extra time and effort!
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Thank you for your videos they explain and teach better than actual class at hvac school.
Chris you are the mad scientist of refrigeration. Keep the video rolling!
Awesome video Chris- learned a lot in this unit. Thanks for sharing your work with us.
Thanks for watching! I will be going live on RUclips this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and RUclips comments. Come over and check it out if you can. ruclips.net/video/edrzjZTZX18/видео.html
Excellent explanation of how to adjust proper winter charge. Appreciate you taking the time for these videos.I always learn something.
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Thank you so much for what you do, I was an Hvacr tech in Pennsylvania, I’ve gotten hurt and found other things wrong, it’s just nice to watch and love the camera angles..I almost feel like a helper.. keep it up..
Great example for calculating the winter charge. Very important to keep the densities in mind. Thank you so much for the video.
Great video. Cold weather is something that takes experience to deal with. Still learning to this day.
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Excellent video as usual Chris!! Good explanation of the condenser valve
Thank you for upload Chris.
Thank you brother. Your skills are very impressive. Its great to have a skilled tech share his knowledge through experience. I dream to be skilled like you one day. Keep up the good work. Thanks again!
Just noticed a curious hyacinth sticker. So cool!
Great video, really like how you explained winter charge!
Yeah Bill is a cool dude, I will be going live on RUclips this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and RUclips comments. Come over and check it out if you can. ruclips.net/video/edrzjZTZX18/видео.html
I do residential rough ins, residential install and replacement. I like watching your videos because it's very informative and interesting. I love my job but I would also like to learn more about commercial refrigeration systems also. Keep up the great videos. Your an inspiration to people like me.
Mad respect to you! Your knowledge is crazy cool!
You never fail to amaze me with how you take the time to repair othere people stuff like it's you own . Kuddos to you sir .
Gotta keep the customer happy and maybe they will call me back! I will be going live on RUclips this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and RUclips comments. Come over and check it out if you can. ruclips.net/video/edrzjZTZX18/видео.html
wow this video explained a lot about head pressure controls and the bypassing operation. really helped me out when i drew it out on a piece of paper while u were talking. thanks a lot
so when the refrigerant goes from the discharge line to the reciever liquid line, the headmaster can regulate the psi going in? and out?
and the headmaster allows refrigerant to go thru the compressor at 180 psi?
I watched this video last year and it was confusing, but when put close attention and do the math with the material printed, the results are way better. Thank you again for taking the time to show this winter charge example.
You explained the condenser coil for the right amount refrigeration for the unit, calculations and formulas. Good job.
great dyscription and explination in this vid. thanks!
Thank you for your talk on Head pressure control valve, and problems that may arise from low charge,,,
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Another great video. Clear instructions and very good insight.
Think I'll just stick with the heat producing device.
Love your videos. Thanks
Awesome vid. Pretty cool methods, in aus I haven’t had the chance to work on a condensing unit with that type of condenser valve.
I would of probably looked at cleaning the indoors first so that gas charging was more accurate. Having the indoor like that would have probably ended up with an overcharged system if the sight glass was filled before set point was achieved on the box. I’ll keep watching these vids are good.👍
As usual great video... your content is always appreciated 👍🏿
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Keep up the Good work, keep the videos coming my friend 👍
Your videos are fantastic THANKS
ALWAYS REALLY GREAT VIDEOS, THANKS
Good find we do get calls in the northeastern on refrigeration systems.Its common when the temperature fluctuated when it drops at night when the season change. A lot new guys get this diagnose as a leaking system it's stacking refrigerant in the condenser when temperature drops. Good explaining the head master .
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I love condensing units on ground outside. all the luxury service call.
Yes i appreciate them too, I will be going live on RUclips this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and RUclips comments. Come over and check it out if you can. ruclips.net/video/edrzjZTZX18/видео.html
Thank you I enjoyed and easily understood what you were showing us. I like to know even if I never get a chance to do this. Again thank you!
I wonder if Sporlan made a calculation guide in metric units , that would make it so much easier for us lot !
Seriously, there's conversion formulas for every metric and imperial measurement out there. The math is the exact same. Just the unit of measurement changes. 14.35lbs is just shy over 6.5kg. Silly foreigners.
Good vids been here since 300 subs been learning alot especially about thinking about the customer
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I own my own Tech buisness so no where close to HVAC/R but this guy has real buisness skill, talk to people, get a firm grip on what EXACTLY the problem is and educate when mistakes are made.
Thanks for watching !!
My hats off to you for explaining how to charge with a headmaster. I think headmasters really confuse a lot of guys especially young techs. You explained how to calculate a charge perfectly. Bravo your vids are addicting go figure yesterday was my first day off in 14 days since I was on call and worked all last weekend. The last thing I wanted to think about this weekend was work and yet I've been watching your videos for hours now.
Ha, thanks bud
I love this work
That winter charge calculation process is just begging to be put into a spreadsheet...
Very informative video, as always! Keep 'em coming.
There is a spreadsheet floating around but I did not create it
Thanks Chris! Enjoyed this educational masterpiece. You are great at explaining the operation of the components. Looking forward to more adventures.
good staff chris much much aprociate
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Great video. Thank you!
Every time I read your title I try to guess the problem before I start watching. This is the first time I guessed right. Low charge equals low suction pressure when its cold out. Of course there could be a restriction somewhere or something and obviously theres a leak but its fun to try to guess. Great work as usual.
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Great job and video
Once again, thank you so much for your video. This one I probably will watch it more than once to get used to the calculations. I need to get that Sporlan manual though. Your explanation was clear and not confusing at all. That's what I think.
One common thing that I have noticed in a lot of the units that you have worked on is the undersized pipe for condensate drains used during the installation. In a several of them (videos/units) I have noticed that they hooked up more than one drain to the same pipe size. That is no bueno because, in order to avoid blockage over the years, it is important to increase the pipe size when connecting more than one drain, and to pitch it properly. For instance, If you are running 3/4" and you want to connect other unit to the same drain, go 1" from there. If you want to connect two more drains, go 1 1/4" from there and so on. Pitch it at a 1/4" per foot.
Less problems will be created due to a clogged condensate drain pipe. Well, that's what I would do.
I remember a video in which you had to connect hoses and the water when all over the place and that the Manager was freaking out. All the pipe is 3/4" size and it carries condensate from different units. I have to go back and watch it again, but my point is that pipe size should be increased when more than one drain is being connected to a main.
I learned something new today thank you
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Great job Chris.
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Great video. Thank you.
Throw a fan cycle on there it’s golden 🤘good video brotha your pretty sharp in our trade
Excellent video and job 👍👍👍
Another great video Chris.
Thanks Ralph!
Yes, you did confuse the heck out of me with those calculations to get it to run at lower temp. But, damn, you're briliant, man.. i dont think i could ever be as good a tech
Thanks Very well explained and helpful video 👍🖐
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Quick tip: spray the cond. Cool with cold water while you charge, then clear the sight glass. Pump down at king valve and if it pumps down without the Head pressure going up, you know it's not over charged.
That way you know you're good for a fact in any weather condition whether it's negative ten or a hundred degrees
All very well explained thanks
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Great video keep them coming
Thanks bud, will do
I was guessing headmaster bypassing when i saw the title. ;-)
Just found your channel today and subed. 38 yrs. commercial hvac/r mostly supermarkets.
Thanks for the sub, I'm just trying to share the little bit of knowledge I have
@@HVACRVIDEOS Your doing a great job!
It's a tough trade and people don't realize
the amount of knowledge a tech needs to
diagnose a problem. You need to know more about electrical than the electrician.
More about plumbing than the plumber.
You need to be part chemist and have
great people skills... And you have to keep up with an industry that's constantly changing and work in an environment
that's usually not comfortable. And be
called out in the middle of the night!!!
we thank you a lot!
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Great video!!!
Nice video; I would start with the cleaning off the evaporator. Then check the charge and pressure readings.
Grtz from the Netherlands.
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Very informative. I need to do this calculation One day.
It's too easy Ruben and there is also a spreadsheet out there floating around that does all the math for you! I will be going live on RUclips this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and RUclips comments. Come over and check it out if you can. ruclips.net/video/edrzjZTZX18/видео.html
Masterclass 👌
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wow very good thanks
Very informative...thank you!!!!
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Thanks for the great video
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hi Chris, nice video again, and the way to charge for winter, good explanation, but i will preffer sporlan make the measures in metric system, a little bit more easy, but still good job.
Another great video !!
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My experience this morning when I got to work. Walk in was 30 degrees while it was 21 outside here in NC. As it got somewhat warmer outside the walk in temp dropped down to 20 degrees
Amazing thank you
You can also use an HP-switch with auto reset or fanspeed controller. So you keep the discharge pressure stable at 15Bar. Works very effective with cold oudside Temps and you don't have to add refrigerant.
Are you talking about a fan cycle switch? And a head master?
Great job!!!
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Love the I pad wish I could have had one .
Ronald Zeigler Yeah that was cool when I saw that!
Thank you sir
love the way you threw the cardboard haha
Yeah I was a little flustered! I will be going live on RUclips this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and RUclips comments. Come over and check it out if you can. ruclips.net/video/edrzjZTZX18/видео.html
Worked on a lot of Russell's condensers in ft lauderdale fla.
thanks for sharing
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Dont forget the old saying, "Hindsight is always 20/20" couple that with the two sadest words in the English language, "If Only", and dont worry about it too much.
Good calculation. Exactly how school taught me.
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I think they were blocking the condenser with the cardboard to keep the head pressure up so it would run
I'd stick a fan cycling control on one of those fans too.....
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I mean if you came to one and the fan cycle was bad i would just block it off to help it run until you could get one.
Another way to understand head pressure control valves. The valve backs up liquid into the condenser during cold weather, effectively making the condenser smaller.
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They are installing headmasters rated at 150 psig for DOE regulations which by the way has a percent error +/- 15 psig. The head pressure of 135 psig is not enough pressure drop to cause proper txv function. Here in Buffalo it's below 50 degrees like 8 months out of the year.
Yeah I have asked about that, seems kinda silly.
Good bro 👊
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I have 30 lb r22 I got for $36.00 still sealed. Retired now but have a r22 system in my garage.
well am calling the hvac school i went to and telling them i need my money back what module is this, daaam chris u are the refrigeration whisperer...lol.
Thanks Chad! I will be going live on RUclips this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and RUclips comments. Come over and check it out if you can. ruclips.net/video/edrzjZTZX18/видео.html
Sweet man.
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Dude, I’m going back into market service. I’ll be watching more 🤣 Unfortunately, anhydrous ammonia operators don’t make as much money... Time to get back into it and make more!
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Propane tanks have a tape to indicate liquid level wonder if applicable on a receiver such as that for winter charge level.?
Wow that blew my mind
my teacher did not tell us about that when I was in school lol thanks for the detail information
Question now can I use this calculation on different refrigerant at 0 (zero) degrees for example 404a or 407c and so on ?
Question do I need to have a headmaster in the unit so I can use this calculation or if the unit only has a liquid receiver or both ?
This only applies with a head pressure control valve, and yes if you download the manual it has different refrigerants in it, I will discuss this on my Livestream tonight I will be going live on RUclips this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and RUclips comments. Come over and check it out if you can. ruclips.net/video/edrzjZTZX18/видео.html
Great vid, man! WHat brand is that charging-T you have for your suction liine probe? Only one I've been ablle to find iis an appion one. Your's looks like a finished one piece.
It's a CPS charging tee from truetechtools.com
Can't they install a tube that will reach low inside the receiver to try prevent by-passing ?
A box with air this dirty should have an independent, dedicated air filtration mini-system to keep the dirt out of the evap. Could greatly reduce evap clogging and almost eliminate difficult, corrosive fin cleaning.
Super info. How much extra did you add for the flooded charge? Keep up the great videos. Thanks, Chris.
I think the calculated flooded charge was 14 lbs if I remember correctly, but my system was only 4 lbs short
Question? Wouldn’t it be easier just to fill the receiver to the maximum allowable amount which is 80%?or maybe there is something more important that I am not seeing.
Very interesting video, thank you for sharing that.
When this situation starts to happen, would it make the TXV sound like it has a restriction?
I have a walk-in cooler that on a very cold night the TXV sounds like it is restricted, that's the best I can describe it. The first time it happened my refrigeration guy came out and said it might be a problem with the headmaster. Then through the spring and summer I forgot all about it until I heard that same noise a couple nights ago.
Problem is I'm in SO Cal along the coast where 45 degrees is very uncommon and it's 1 or 2am when I hear this and I don't want to bother my refer guy in the middle of the night.
So if I hear this noise again would it be helpful to check the sight glass and measure the temps before and after the headmaster?
Is below 50 degrees "cold enough" to cause a large enough pressure decrease for R410a?
Thanks for taking the time to share these videos.
Dave
Yes the sight glass should be clear whenever the system is running cold or hot outside it should always be clear. But my concern is you mentioned 410a walk in coolers dont use 410a are you sure you are speaking of the right refeigerant?
Also to answer your question yes the txv will make a hollow hissing sound when vapor is present at the inlet of the valve
Wow, Thank You very much for taking the time to answer my question.
Your correct, it's 404A a Tecumseh AWA95142ZXNHN condensing unit. I'm in LA county right on the water so we don't get extreme temp changes or freezing temperatures.
But I just looked and can clearly see the places you measured the temps to see if the headmaster was bypassing and next time it happens I can check that and the sight glass and hopefully save my guy from coming out in the middle of the night.Thank you very much for your help!
How can we know density factors in other temperatures?
Suggest customer to switch refrigerant from R22 to R404A?
Hey Chris, make a hat with that Meme of yours!. looks funny!
Great job. Do you ever check the level of the receiver with a digital thermometer? We used to cycle the fans on the condenser but if it was a really windy day that caused some issues. Thanks for the video's.
Or take your propane tank and run it up and down the rec. That will give you the liq level.
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is it safe to use a degreaser ont he condenser coils
Yeah just make sure it is a metal safe cleaner, I prefer the Viper products as they do a great job and are safe I will be going live on RUclips this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and RUclips comments. Come over and check it out if you can. ruclips.net/video/edrzjZTZX18/видео.html
From your presentation I made a spreadsheet to calculate this, which I'm trying to proof.
0°F Density Factor = 0.100
40°F Density Factor = 0.094
Condenser length = 33"
Condenser tube diameter = .5"
Number of Tubes = 48
Number of Bends = 46
Return tube equivalent length = 0.25"
Condenser equivalent length = 143.5'
Total winter charge = 14 lbs 6 oz
Winter charge needed for 0°F = 0 lbs 14 oz
1. In that situation calculate an additional 14 oz after clearing the sight glass?
2. And if you were above 70°F (HPR not bypassing) you would add the entire 14 lbs 6 oz after just clearing the sightglass?
IMPORTANT Using this method with a clear sightglass, you would first need to remove refrigerant until the sightglass just starts to flash. Then add the refrigerant back in until you just clear the sightglass, before following this procedure.
Remember to wait for the system to stabilize with every step along the way. Over charging have serious consequences!