WALK IN COOLER ONLY WORKS WHEN IT'S WARM OUTSIDE
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- เผยแพร่เมื่อ 17 ก.ย. 2024
- 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.
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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!
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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.
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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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 TH-cam this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and TH-cam comments. Come over and check it out if you can. th-cam.com/video/edrzjZTZX18/w-d-xo.html
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.
Great example for calculating the winter charge. Very important to keep the densities in mind. Thank you so much for the video.
You explained the condenser coil for the right amount refrigeration for the unit, calculations and formulas. Good job.
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 !!
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..
Chris you are the mad scientist of refrigeration. Keep the video rolling!
I love condensing units on ground outside. all the luxury service call.
Yes i appreciate them too, I will be going live on TH-cam this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and TH-cam comments. Come over and check it out if you can. th-cam.com/video/edrzjZTZX18/w-d-xo.html
Thank you for your videos they explain and teach better than actual class at hvac school.
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 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.
Great video. Cold weather is something that takes experience to deal with. Still learning to this day.
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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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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.
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
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.
Think I'll just stick with the heat producing device.
Love your videos. Thanks
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 TH-cam this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and TH-cam comments. Come over and check it out if you can. th-cam.com/video/edrzjZTZX18/w-d-xo.html
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.👍
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
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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Excellent video, Chris! Thanks for making these videos, they take alot of extra time and effort!
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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.
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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love the way you threw the cardboard haha
Yeah I was a little flustered! I will be going live on TH-cam this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and TH-cam comments. Come over and check it out if you can. th-cam.com/video/edrzjZTZX18/w-d-xo.html
Thank you for your talk on Head pressure control valve, and problems that may arise from low charge,,,
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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
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?
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!
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.
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 TH-cam this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and TH-cam comments. Come over and check it out if you can. th-cam.com/video/edrzjZTZX18/w-d-xo.html
Always love your content Chris, every video that you post is helping me out through this trade.
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?
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.
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
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!!!
great dyscription and explination in this vid. thanks!
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 TH-cam this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and TH-cam comments. Come over and check it out if you can. th-cam.com/video/edrzjZTZX18/w-d-xo.html
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
Excellent video as usual Chris!! Good explanation of the condenser valve
Awesome video Chris- learned a lot in this unit. Thanks for sharing your work with us.
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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 for upload Chris.
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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I have 30 lb r22 I got for $36.00 still sealed. Retired now but have a r22 system in my garage.
Throw a fan cycle on there it’s golden 🤘good video brotha your pretty sharp in our trade
we thank you a lot!
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Worked on a lot of Russell's condensers in ft lauderdale fla.
Another great video. Clear instructions and very good insight.
Masterclass 👌
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Keep up the Good work, keep the videos coming my friend 👍
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.
Great job Chris.
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Good vids been here since 300 subs been learning alot especially about thinking about the customer
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good staff chris much much aprociate
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Those evap coils that are so often dirty and fins clogged up -- who is responsible for regular in-service cleaning of them? The owner or yourself? If owner, have they been trained in this? What about regular or periodic retraining?
I am a retired desk jockey, but I find these vids very interesting.
the owner is responsible for getting it done but that is usually part of preventative maintenance that they can ask for.
I see it distressingly often in computers too.
The heat sink fins have air pushed or pulled over them in much the same way as HVAC equipment does. The fin pitch is often tighter, in order to be able to fit them inside of a relatively small computer enclosure.
A PC can be left purring away in a corner for as many as 5-10 years with the side door never being opened. While on the dirty floor.
I have seen some genuinely terrifying dirt clogs, and wondered how these systems were still working and not just ... cooking.
I've seen them with over 1/8" of CRUD caked into the heat sinks.
People just don't clean their stuff.
Mad respect to you! Your knowledge is crazy cool!
I love this work
Good calculation. Exactly how school taught me.
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As usual great video... your content is always appreciated 👍🏿
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I learned something new today thank you
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Your videos are fantastic THANKS
Thanks Chris! Enjoyed this educational masterpiece. You are great at explaining the operation of the components. Looking forward to more adventures.
Another great video Chris.
Thanks Ralph!
ALWAYS REALLY GREAT VIDEOS, THANKS
Great job and video
Excellent video and job 👍👍👍
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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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!
On a cooler I always do 1 defrost a day at around 1 or 2 am for a couple hours. So all the ice, if any is guaranteed to be melted off.
Great video. Thank you!
Simple physics. Well, simplified, more like. With the ideal gas law, pressure and volume are directly proportional to number of molecules and temperature (and a constant we can ignore since it is constant.)
Since the volume doesn't change because the tubing is all the same, we can ignore volume for the overall system. (Volume is important at the metering and compression side because that's how the whole system works! But we can ignore that here and relates to Boyle's law and joules Thomson effect and most all gases since they're not actually ideal gases.)
So outside temperature falls. Number of molecules stays the same (the bypass valve hasn't gone off to add extra). On the other side of the equation the volume is the same. So the only thing that can change is the pressure must fall as well.
If you need to raise the pressure for proper metering to get that heat absorption, the only thing you can do is add heat (which you don't control the weather) restrict the volume (closed system, you can't shrink the pipes on command) or... add molecules ie more refrigerant.
So, thats why you have extra refrigerant for winter temperatures for refrigeration systems with condensers located outdoors. TA-DA!
Since most residential AC aren't needed in winter, they wont have that. Many businesses won't either but some big businesses might. And restaurants all have their condensers outside so they'd need the capability. Other refrigerators inside the house or restaurant that reject heat into the indoors area, well you're warmer than ambient outdoor air, i hope, so it isn't an issue either.
There is the simplified version of why if anyone is curious.
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.
Presumably that density factor (.100) must be determined both by the diameter of the tubing and the actual density of the refrigerant. So it would be better to call it a density factor for R-22 (at 0 F) per foot of 1/2 inch tube.
Good point!
All very well explained thanks
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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!
Pluggo buggo 😂 Dirty coilititus
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.
Great video keep them coming
Thanks bud, will do
wow very good thanks
Thanks Very well explained and helpful video 👍🖐
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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 TH-cam this evening 11/4/19 @ 5:PM (pacific time) to discuss my most recent uploads answer questions from emails, the chat, and TH-cam comments. Come over and check it out if you can. th-cam.com/video/edrzjZTZX18/w-d-xo.html
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
Just on the title alone, the sys. Is short of gas!
Tis the season.....
That was my first thought too
I'd love to hear the business calls to the previous techs saying they're fired... but why? well... HVACR videos... *click*...
Was the make-up air in the kitchen crappy? Way too much grease on the evaporator in the walkin cooler.
Propane tanks have a tape to indicate liquid level wonder if applicable on a receiver such as that for winter charge level.?
Very informative...thank you!!!!
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Why do other techs in other businesses keep claiming that a flashing sight glass does not matter? I would think it is pretty important, and if it didn’t matter would not be included to see. As to why though, I am not sure
It all depends on what type of system the sight glass is on. On a Refrigeration system with a TEV and a receiver the sight glass needs to be clear to insure proper refrigerant charge.
Not an HVAC tech, but really a flashing sight glass indicates a 2-phase mixture (liquid + gas) coming back from the condenser. On most general refrigeration systems this usually is a low charge. There is not enough charge in the system for the high side pressure to be high enough to have only liquid refrigerant coming back in the return line. Since gas does not absorb much heat when it expands, the performance drops as the ratio to gas/liquid increases. Back when I was doing site survey work for retail construction I used to do the same thing by listening to the expansion valve and checking the suction and return line temperatures by hand on split-systems that had the evaporator accessible. The sound and the temperature difference across the evaporator provided a crude indication of how the equipment was operating.
I never see you washing or cleaning fan blades weather it’s on the roof or inside, that will increase amp draw on motors, try it, it does work.
Thanks for the great video
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Great job!!!
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Great video!!!
Hey Chris, make a hat with that Meme of yours!. looks funny!
Another great video !!
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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
When you add the winter charge are you suppose to remove it when summer begins?
No if the system is designed properly once you add the flooded charge (winter charge) it strays in the system all year long, however if the system is not designed properly the receiver may not be big enough to hold the entire flooded charge throughout the summer.
What’s that app your working with on the tablet?
It's called Measure Quick it's free on any app store.