This was a service call on a walk in freezer not cooling, the call came in during a 120 degree heat wave we had in early July. I found that the scroll compressor had dis-engaged and was internally bypassing when I arrived, I cleaned up the condenser and got the compressor cooled off and it started back up.
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So we have a complaint that a walk-in freezer and a walk-in coolers, not working properly just walked onto the roof, and that compressor is going off on internal bypass right now that large scroll compressor on the right, the scroll has separated inside and it's bypassing the refrigerant. So we're going to turn off this rack see if it's dirty, I'm pretty sure it is and clean it out, and then once we get everything cooled down, we'll put some gauges on and we go from it yeah, it's dirty! That's the condenser walking cool there right there, so we're gon na get these cleaned up. Just like on my other videos, I like to work: smart, not hard, take all the panels off access the condenser wash from the top down right down into it and we're just doing the water rinse and then we'll get some acid on there in a minute, nice And slow, let's be thorough and get this done right. My main concern is down all the way back in here and I'm gon na try to wash up all the big stuff inside got it foamed up from the top down foaming all crazy down in there.
Just letting it sit for a few minutes and then we're gon na rinse again from the top down nice and thorough, it's evaporating pretty quick, too. Okay. So all right now we're all cleaned up. It's all dried out! I'm gon na get ready to turn this on.
So you can see we're clean all the way back now actually clean, because I go all the way back in there a hard spot to get so. I hope that this compressor resets now just like I've, showed before we're turning these breakers on one at a time giving it about five to ten seconds per breaker. Let the compressor turn on calm down and then we're moving down the line. One compressor at a time make sure they actually come on.
Try not to overload their system system deep, this bad boy, which is cyclases, clear watch, it's the walk-in cooler and it kind of looks like it's flashing. That's one of the ones we're here for we're here. For the walk-in, cooler and freezer so we'll see, we've got a history with this compressor right here overheating we can't handle the high temperatures. We've got the super heat set right, but it just can't it just constantly goes over.
You know overheats basically, and we know that the DTC valve is working properly. It just has a hard time. I've had a hard time with this one, so we'll see, let's hope, cross their fingers cuz. I really don't have to change the compressor today if there's any constellation, that's a load of long, so I guess that would make it a little bit easier, but still being the ass.
So all right now sign for the next one. Okay, so we're coming down to temp, it's definitely still warm outside it's about a hundred degrees. My suction super neat. That's my compressor.
Super heat. That's really high right now, but it also is under a really heavy load. This is the walk-in freezer, my liquid line. Temp.
That's actually my discharge line. I just wanted to see what my discharge temp was one hundred and sixty-four degrees. That's not too bad. It's running, we've got oil DGC valve is actually cooling, so the walk-in cooler looks good sight. Glass is clear and Matt I like that. Head pressure better than the walk-in freezer for sure, I'm gon na do a little research. It almost makes me wonder if the condenser for the walk-in freezers rack of anywhere now we're looking good with the line scent of my discharge, light yeah, looking good so, like I had mentioned, I've had problems here in the past, with head pressure issues and in the Summertime we get these little heat waves where it hits one hundred fifteen hundred and twenty, and it just gets ridiculous. So what I did was actually out in a swamp cooler and I leave that panel off and I blow you know, pull the air 20 degrees.
25 degrees, whatever blow it in there to try to kind of pre cool that rack and it really does help. I just think, let's hope all that was wrong. Today was just that the condenser was dirty, so we went off on my head pressure, I'm hoping because it seems to be running fine right now, but it's also cooling down. It's only a hundred right now we got all the way up to 120.
So we'll see. Ok, so this was a service call on a walk-in freezer and walk-in cooler that weren't working properly. This was when we had a blast a couple weeks ago of heat. It reached a hundred and twenty degrees outside, and what had happened was the condenser was plugged up, as you guys saw in the video, and my theory is - is that the compressor was turning on and off on high pressure, because it has an auto reset high pressure Control - and it happened so many times that finally, the scroll disengaged and let the compressors pressures internally bypass, because when I arrived, you could hear the audible sound of the compressor bypassing on the inside.
If you guys don't know what that sounds like, or what to look for, the compressor still had three-phase power and the motor was running in the compressor, but the scroll disengaged, regardless. The reason why it happened was because the condenser was plugged up really bad. So I went ahead and thoroughly cleaned that entire refrigeration rack and got everything back up and running. I ended up going back a couple days later after the box has satisfied - and you know, stabilized and checked the evaporator superheat and it's running at 8 degrees, evaporator superheat.
So that was great and the system's working fine still. It has since been like. I said a couple weeks and you know no problems at all, so everything's good. One of the things is that particular rack.
I did mention that me um. You know I was just kind of thinking, as I was talking wondering if that condenser was potentially under sized. I still haven't done too much research on that. I still kind of wonder about that, because I had to add that swamp cooler to cool that rack off, because without that swamp cooler when it hit about a hundred and five the walk-in freezer and the walk-in cooler compressors would fall off the map and go off In high temperature me personally, you know I don't know how you guys feel any of you that have experience, I'm not super fond of low temperature compressors being scroll. I tend to have more problems with it. I mean, do you guys have problems? I have several different models: different sizes, you know different capacities and I tend to have a lot of problems with the low temperature scroll compressors. I'm just I don't know just just seems to be kind of a more more than a more of a pain than you know, a help. Basically, man, I just really like a good semi-hermetic or even a reciprocating compressor versus just one of those scroll ones for the low temp applications.
At least I kind of wonder. I've heard that they're going to fractional horsepower on the scroll compressors for the small, like half horse horsepower and three-quarter horsepower condensing units refrigeration wise. I kind of wonder how that's gon na work out with the high temperature situations. Also, let me know if any of you guys have used any of those fractional horsepower scroll, compressors, I'd kind of like to know how it works out anyways.
I really appreciate you guys taking the time to watch this video. Please leave me a comment in the comment section give me a thumbs up and if you like what I produce please subscribe to my channel. Okay. Thank you very much.
I'm willing to bet that since most people go on the cheap to save money, you have undersized condensers. I'm not a pro though so dont listen to me. Thx for the great videos.
I think I was back in socal right after that heat wave. Those temps are brutal and personally I think being a HVAC technician goes from just a job to a life-saving service. Service area Barrhaven??
I agree ☝️
we are at Copeland or so sorry to hear about this please give us the model number so you can get a replacement compressor
It's always been my understanding that scroll comps. we're and are intended for dealing with much bigger loads of refrigerant. both in terms of the quantity (lbs) and the actual temp difference. almost feel like that particular application is like putting a v8 in a civic. Don't think it is the coil that is undersized but more so the compressor.
Agreed mate, here in Australia we use recips on low pressure apps, bitzer semi's particularly running 404.
Scrolls for medium temp or a/c.
Regular days of 85% RH, 105 deg c is normal.
Good info great channel, well done.
On scroll low temp units I use a TREV valve and it seems to cure high temp and pressure issues during high ambient situations Are you in Orleans ?
Could even get fancy ( if you haven't already ) and set that swamp cooler up on a high side switch. Head gets to a set point and turns the cooler on.
What's the difference between a walk in cooler and a walk in freezer? Service area Kanata??
Where did you get that water connection, looks pretty handy!
I’m not into HVAC as a job but I am curious as the topic still interests me. What do you think about scroll compressors compared to reciprocating piston ones? Are they any more reliable, more efficient, quieter?
And, I’ve watched a good number of these videos now and I’ve never seen anything that looks like an inverter drive for these compressors. Am I just not seeing them, or is it just smaller light duty compressors that run inverter hardware?
This is my favorite hvac subscriber, the man literally does it all commercial refrigeration. I love the service call walk through and the ending recap 5 star material, not everybody does that. YouTube needs to do video awards red carpet invite this man on board cause this is the stuff of legends.
I'm gonna watch all of them lmao
In low temp I always preferred semi-hermetic so long as it was an internal refrigerant cooled motor. I was never a fan of recip compressors in low temp, I would choose a scroll over a recip.
You should indicate type of refrigerant.
Hi Mate. Great vid. Once you’ve confirmed condenser size is correct and condenser u bends are all connected correctly. Its possible it might have air in system. Change driers and triple evac breaking with dry nitrogen and try to get a 100 micron vacuum. Use a 4 port gauge manifold so you don’t have to “open” anything up to atmosphere. Interested to see how it ends up. Cheers!
Hello buddy, I am refrigeration mechanic from Canada , I really enjoyed your video, because you are open mind and like to share information thank you so much!
I agree with you on the scrolls for low temp. Our company avoids installing those type of units. I remember some super markets would have to leave water hoses hitting the condenser on hot days because they would get head pressure issues too.
Nice cleaning brother man!! Thoroughly done playa!!!
Nice cleaning brother man!! Thoroughly done playa!!! Are you in Ottawa ?
Excellent video! Service area Nepean??
Great video. I have not had any issues with low temp Scrolls but extreme temperatures in my neck of the woods are around 95°. That being said I still prefer semi hermetics for my low temp applications. As always thank you. Are you in Nepean ?
I feel like a big component that contributes to the scrolls running good in low temp situations is that liquid line injection valve working properly. I run into some situations where that valve isn’t cooling properly and it really beats on the compressor. Anytime I replace a low temp scroll I always do the LLIV Service area Ottawa??
Cool
Great Video , does this unit have a crankcase valve to reduce load on compressor after startup?
What is the DTC Valve and how does it work?
don't have a single Problem with Low temp Scrolls.. i live in Toronto and yes we have serious heat waves going through 1 right now what i tend to do is when i have a remote system my compressors are indoors condensers outside or on the roof or compressors in a shed and the condensers themselves sit on a bench they are over sized..only because of critical moments .. other than that i have no issues they actually tend to run slower in hot weather that's the only thing… Semi's are very fragile it wouldn't survive going on and off on and off unless its a real big boy. Dome Compressors are very durable also smaller Semis are becoming obsolete due to everything Price weight size… Are you in Kanata ?
Thanks for the lesson. Keep them coming.
How about adding another condensor fan on top in the gap..or a bigger diameter fan right above the freezer condensor and moving existing one to the middle.. may do the job..??? good clean job..
Actually scrolls are great on handling high head, but you have keep in mind that they are fixed displacement and have a max pressure ratio if it exeeds that it will start to by pass.
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Nothing wants to work at 120 degrees ambient. That's tough. I have a 250 ton air cooled chiller condenser that we actually set up lawn sprinklers underneath it when it gets above 90 or it just won't stay running. I like the swamp cooler idea…Whatever it takes! Great video as always!
I dont see scrolls in refrigeration,see them in a lot of AAONs units though. I was always told that condensing units have issues at ambient temperatures above 100 degrees?
Scroll freezers seem to struggle a lot in 90+ degree weather. I think it has a lot to do with refrigeration barely being 8 seer equipment… Small condenser coils.
Nice video bro. I just joined your channel because nor-cal Dave gave you a shout out. Good video that for the help.
120 degrees outside?! Dear god. I live in Florida and 95 is with 60% humidity is bad enough
just signed up for the patreon keep the videos coming ur videos are great
great video as always a question for you where do u get you'r exhaust fans from do you have a supplier other than Ferguson if u do it will be great if not thanks for you'r time brother
Completely agree, scroll low temp issues. Internal check valve issues, automatically install external check valve on discharge line. Haven't seen any bulletins on low temp scrolls, but iv seen some medium temp scrolls with liquid injector ports, which makes me wonder if there's more going on with these scrolls overheating
95% of problems goes back to lack of air flow……if not more!
I tend to agree about the undersized condenser for that scroll. And a more frequent coil cleaning should be in order considering the condition of those coils were in. Each of those compressors are suffering from those dirty condeser coils. Oil break down and lube ability is definitely affected by the inability to dissipate heat through the condenser. I have seen this a number of times. Compressor longevity is shortened also if this is not addressed. The problems can just keep mounting can't they? That's what I think. Appreciate your thoroughness, and your reasoning and explanations.
Not here but a friend ofmine had some headaches with one but I've work with similar racks and no problems low/med temp and all 5 where scrolls
Time for a Tecumseh, get that scroll out of LT. Good video.
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120 wow
Awesome job once again 👍🏼🤙🏼 is that out in Palm Springs it gets that HOT!. Just as bad as Arizona
We do have issues with scrolls on LT systems. Normally the liquid injection valve would normally break down and the compressor would normally heat up and burn out. I think scrolls are just an easier option and a cheap one also.
Chris you are the man