This was an overtime service call on a Sunday morning on their walk in freezer being too warm.
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Fieldpiece SC480 meter https://www.trutechtools.com/Fieldpiece-SC480-Job-Link-System-Power-Clamp-Meter?affid=36
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BlueVac Pro micron gauge - https://www.trutechtools.com/BluvacProPlus?affid=36
TruBlu pro evacuation kit - https://www.trutechtools.com/Accutools-A10757-3-TruBlu-Professional-Evacuation-Kit?affid=36
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12523 LIMONITE AVE.
#440 - 184
MIRA LOMA, CA. 91752
This video is brought to you by sport'ln quality, integrity and tradition. We have a Sunday morning, emergency service call on a walk-in freezer. That is not working. It's uh! If I had to guess it's about 50 degrees in here right now, so coils not running at all.
This evaporator coil, the power supply, comes from the roof, so the condensing unit basically controls everything via the defrost clock, so we're actually gon na start up there and see if we have power up there and then work our way back down here all right, we got Our condensing units right here - one of these is the freezer. One of them is a cooler, this one's actually labeled walk-in freezer, so we'll get in here, open it up and start diagnosing. You got like a super early heat wave here in SoCal, so it's about 97 degrees. I think - and it's April 26 so definitely got the umbrella to kind of shade me from the Sun a little bit.
For that reason, I actually wear long-sleeved shirts all year long, even in the summertime. I find that the long-sleeve shirts actually keep the Sun off my skin number one I'm worried about skin cancer, but number two. It actually keeps you cooler, believe it or not all right. Electrical control, section doesn't look too bad, looks pretty typical, nothing crazy, jumping out of me we're gon na start by checking voltage turn the meter on we're going to check three phase voltage coming in line one to line to 206 line, one to line three 204 line To to line three 206, the unit has a schematic, but I understand the sequence of operation.
So the next thing I'm going to do is go ahead and test out my defrost clock. I'm going to test from one to n. We have 208 volt, so my defrost clock has power. Now we're going to test from in two four: we have 200 a vault, so my defrost clock is in refrigeration mode singing power down to the thermostat in the liquid line, solenoid valve next, we're going to test power between N and 3 to confirm we're not in Defrost in two three: we are not in defrost, so the defrost clock is working properly.
So now we need to see if we are off on low pressure, so we're going to turn around go to the other side and check the low pressure control. So what happens? Is when the defrost clock sends power downstairs, it sends it to the the temperature controller or the thermostat that opens up the silhouette valve and allows the refrigerant to come back up and the compressor is turned on and off via the low pressure control. So we're going to test the low pressure control now, all right. We are going to test across the low pressure control and we have nothing so we have a closed circuit.
So now we need to figure out what comes between the low pressure, control and I'll. Tell you right now: it's going to be the high pressure control. The high pressure control is actually right here and let's push it and see what happens that got a bad connection fan motor, we'll test voltage, but it's trying to run and it's locked up the motors. There's no point in testing holes into the the bearings are locked up on the condenser fan motor, so we were off on high pressure. Alright, my system has been running for about 10 minutes. I just wanted to kind of see what kind of pressures we were getting on the system we looked down in my tablet: more than 366 psi on the high side, 26 psi on the low side, and it's just under a hundred degrees ambient right now. So it's pretty hot today it was actually hotter yesterday, so I can see why that condenser fan motor would cause this guy to overheat. This pressure control is there to protect the compressor from causing you know irreversible damage.
Basically, this pressure control should be set to kick out at 410 psi, but I suspect that it probably is kicking out closer to about 380. These pressure controls have never been highly accurate and they tend to kind of trip a little early, so that would explain it. So we need to definitely get that condenser fan motor replaced and again normally I'd, say, I'd check voltage. But there's really no point, because I can feel that the bearings are locked up.
The motors overheating - it's not a PSC, so it doesn't have a capacitor. We can use some common sense here and just say that that motor is bad. It's hotter than crap the bearings are locked up, yeah Piper giggles, I pulled the motor terminals off and I'm moving them out and we've got an open line. So the motor has an internal short and that's why it's not running another thing that I did was.
I went ahead and put my discharge line. Clamp on there just to show something. Look at my discharge line tip my discharge line. Temp is about 240 degrees and that's about 10 inches or so away from the compressor body.
Copeland basically says that that compressor at this point right now is overheating and the longer it runs with the discharge line. Temp, like that, the more potential internal damage is happening inside the compressor, the oils starting to break down. You know - and it's just causing issues inside of there. Typically Coppola wants you to get your discharge line.
Temperature 200 ish. No, you know not too much higher than 200 degrees. There's there's a little bit of a range there and you know there's some things: you're not gon na be able to do like on a on a really hot day. You know I may not be able to control it too much better than that, but at the same time another thing you have to understand because we're under a heavy load - let's it's a hundred degrees outside right now and let's look at my suction line temp.
I have a 63 degrees, suction line temperature right now. Remember: compressors are suction gas cooled. So if we have such a high suction line, temp coming back, that's also hurting the compressor cooling. So it's not just the condenser fan motor.
This thing is under a heavy load because my box temp, is so high right now too, so I'm gon na get that condenser fan motor changed out and then we're gon na watch. This thing come down in temperature and check the vitals after that. All right, I'm about to start this. Guy up, I got the new condenser fan motor installed and I want you to pay attention to the compressors current draw and the discharge line. Temp. When I start up this condenser fan motor you'll also see the head pressure drop significant. Now, as we lower the condensing temperature drop, the current draw drop and the discharge line, temp drop, as you can see, we've had a pretty significant drop in power usage or current drop and condensing temp and as the suction temperature drops. As the box temp comes down, that pressure will also drop as the load decreases.
Alright, this guy is running. It's been running for about 15 minutes. The box temperature is dropping. I'm gon na go ahead and wrap it up on the roof.
There's no way I'm going to be able to watch this thing come down to negative 10, the customer's not going to want to pay overtime for that. So, of course I'll give them the option. But I know they're just going to tell me to bounce and they'll call me if there's any other issues, so I'm going to take everything off go downstairs check on the box temp and then I got to secure the electrical lines for the condenser fan motors. But I just wanted to let it run for a bit.
My discharge, temp is dropped significantly, like I said, Copeland wants it 200 ish, they say max 225. So we're right under that, but again we're still under a heavy load and it just you know when we get high ambient's like we do in SoCal, it's 100 degree ambient right now we can get a hundred and fifteen in the summer, sometimes 120. So your your discharge, temps, gon na rise significantly over that. So I mean you can only do so much but yeah we're gon na.
Let it run and tell them to keep an eye on it. It is 17 degrees inside the box. Now it is going to take a long time for it to come down in temperature. Like I told the customer, it's going to take a couple hours and in all reality, they're ice cream, which is over here, won't be hard until tomorrow.
It might be ruined too, depending on how liquefied I think they might have gotten a delivery. This morning, it still seems pretty firm, but yeah they're coming down in temp, so we'll just tell them to keep an eye on it all right. It doesn't always work out that way. That was a pretty easy one.
Emergency service call on a Sunday walk-in freezer, not working, and it was this was actually a month and a half two months ago as a while ago, but anyways it was our first real heatwave of the season and yeah. We had. You know high head pressure. Tripped found that the unit had a bad condenser fan motor, went ahead and replaced the condenser fan motor and started the system up.
I watched the system operate for a little while and went ahead and just like I said in the video, let the customer know hey. You know I could stand here and watch the thing come down to temp or you could just call me back if you have any other problems, and my customers are usually pretty good with that and they're kind of thankful for the most part. To that you know, I'm willing to say hey, just just call me back if there's another issue now I would charge them. You know two for my time if I had to come back out, but I mean they're still willing to do that because they'd rather not pay me, you know two and a half hours overtime to sit there and just watch the Box come down to temp. Now, if there was something that I was concerned about, if you know it had a refrigerant leak or you know who knows if there was something concerning, then of course I would take the time and watch the thing come down to temp, but just from my gut I was pretty confident that all that was gon na be wrong. Was that condenser fan motor, so I went ahead and let it go and like I said it's been a couple months since then you know no more problems. Customers happy! So yeah, that's pretty much it. I really really appreciate you guys taking the time to watch these videos and watch all the way to the end.
Do me a favor if you haven't already, please consider subscribing to my channel. That really does help me out when I see those subscriber numbers pop up. If you guys are in the market for any tools, I keep saying this at the end of every video. I do have a partnership with true tech tools.
If you find that you like their prices, I have an offer code, big picture. One word: it'll, save you! A percent on your order, I get a small commission, so it's a way to help support the channel and stay tuned, we'll be announcing some information about all this merch that I have back behind me, making that available soon, alright other than that we will catch. You guys on the next one.
I’m learning a lot
The ol 9721 , I’m a 7-11 tech , I always wait for temperature 😂 cha Ching😊 love your videos 😊👍🇺🇸 Are you in Kanata ?
The end!
Best tech on YouTube hands down.
Im surprised that those units don't have duel hp/lp controls. Service area Ottawa??
If there's no current, the circuit would be open, not closed… mix up in terminology? and yeah this shit has been hot as balls for months. Ugh.
OL = Outside of Limits on meters. Just FYI. Either way the motor was obviously toast.
Thanks for showing the numbers drop, always good to see the cause and effect. 🙂
I just found your videos and have just found myself going down the rabbit hole of binge watching them. I am not even an HVAC guy/tech. I just find them really interesting and you make it easy enough to follow along. Service area Nepean??
So you give the Customer the option of you staying to watch it come down to Temp. and they Politely tell you to Bugger Off…
Does anyone make a simple wifi connected temperature alert unit that will send an email alert if the temperature exceeds the programed limits?
It seems like these days something like that should only cost a few bucks (I haven't Googled it yet lol), and anyone with thousands of dollars of food on the line should have one as cheap insurance.
It seems like it's something that you could upsell to everyone.
I know there are freeze warning alarms as part of smart home systems, so maybe if no one makes one that gives overtemp alarms instead of undertemp, you could contact a manufacturer and have them change the software to do over temp, and it could be a thing.
I am sure there are expensive options, and ones that tie into alarm systems, but there should be something as simple to install as an IP security camera, with a web interface to set the parameters, so anyone can install it in a few minutes.
Good job as usual.
I must say that you really give me the desire to work again with cooling systems.
I'm so sad that you are not living in France.
I hope i'll find a boss like you but i don't dream, people like you are very very rare.
Thats exactly why i wear long sleeve shirts all year long as well
I’m beginning to like this guy……he lives in the real world just like me
Great video. Love the steps you take to make sure you are diagnosing correctly. Let’s see a video of your truck
My company gives me the option and I also wear long sleeve. Not only protects from sun but also scraps and just general dirt/grease.
am i the only one to comment that a good technician will also check how dirty the condenser is especially if its on a roof? It wouldve taken literally like 2 seconds to see the other side of the condenser. i would blow it out with CO2, rinse it with water, spray viper coil cleaner, rinse it again. Change the motor and restart the system.
Dang this one was easy! Thanks for uploading it, because it was easy to follow and I learned a few things along the way.
Sir what is your email, if you don't mind. I'm not a salesman or a nut🤣. Thanks
Nice to see you get a easy one 😀
If you have to get called out on a Sunday, I guess that’s a nice problem to encounter 👌🏼
People in California are afraid of everything. A warning for every product on the possibility of getting cancer. I'm surprised that there is so much traffic. Everyone should stay locked up in the house.
Long sleeves. A must. First time that I bare armed a hot gas line, YIKES! Great video, Chris. Have a great Sunday! God bless.
Stumbled across your channel, love to learn new things and have always wanted a inside look at hvacs.
I used to work on arcade machines as a teen in the 90s. This has far more internal parts and boards then any arcade lol. Love the challenges of chasing problems down.
I give a huge thumbs up for always cleaning up the inside of units, its maddening when others leave a huge pile wires hanging around. Zip ties are a wonderful and highly useful item. It would be nice to work with a boss whos attention to details matches my own lol.
Keep up the great and honest service you provide.
Navy VeteranAre you in Ottawa ?Why not replace both fans? Also, wouldn't make sense to wire-brush clean all that rust and give it a coat of Rustoleum ? Service area Orleans??
Shocks so many people that it keeps you cooler. Look at traditional arab dress, they covered from head to toe for a reason (including the men). Are you in Barrhaven ?
Hey man just a quick question, I've only been watching for about 7 months, obviously i don't see every video you put up but anyway to my question, how long have you been doing this work, and where are you located, i seen video where y'all are looking to hire someone, i got going on 9 years experience September will be 9 years, on Commercial hvacr, also in 8 years of experience i work in restaurants and ran multiple service calls every day, i can do install's service, pm, quotes what have you, also I'm in the marine corp reserves. so long story short where you from haha? and whats your normal service area, I'm from Virginia, and thought i heard to say southern California, but I'm okay with relocating. And yes i know sub cool and super heat, and how to get it or "calculate it", and not being cocky or bragging but its rare for me to get call backs or recalls, don't know what y'all call it but pretty much i don't have to go back on a calls that often that i just worked on. I'm currently working for a big company and I'm the lead tech for the branch I'm also 26 years old been doing this ever since high school with my step dad on the weekends and went to trade school for 2 years and got a certificate for that and I'm universal certified, I don't have my masters yet but i will be sitting for it soon, but if i move out there i will just wait get it in va and cal. if i heard you right at the beginning of the video, thanks. added note good video man like how you do things and treat every customer equipment like you own. look forward to more videos.
That umbrella come in handy with sun and rain i use mine a lot, working on RTU'S even when I'm grilling out in the rain.
I like this length of video rather than the long ones.
You know i find odd them window ac never fails its allways walkins or central ac never window units
Fkn awesome. Fixing a cluster.
i did Hvac between Desert storm and aircraft jobs. You are saving the world from idiots. I could never figure that out with my limited knowledge. I know genius when i see it. Too old for climbing ladders and such. Apparently the experts are clueless also.
If the fan motor is not registering any continuity wouldn't that be an open circuit (open winding) rather than a short? A short would register a very low ohm reading….. 0.3 err something around there.
What makes you a superior tech.
1. You understand the theory of operation for the devices you work on.
2. You understand the sequence of operation for the devices you work on.
3. You follow a consistence troubleshooting plan (your big picture) based on item one and item two. A partial list consists of talking to the customer, asking them questions, confirming the customer compliant, looking at the history of the unit via past customer invoices, a visual inspection of the device in question and only then hooking up equipment and taking measurements based on sequence of operation.
The result is less wasted time since you don't get trapped running down various random rabbit holes chasing ghosts.
I find this the success profile of all techs and engineers regardless of the field they work in.
subscribed!
Thanks for sharing your knowledge. 😀 6 months already as a refrigeration technician. Your videos helping me @ lot. Respect!
No CPR valve?, suction burn out drier still inline? Thoughts
Do you only do commercial work, or do you also take residential?
Our 20 year old 4 ton York needed a new compressor about 10 years ago. A storm damaged the old one and blew the capacitor. It was replaced with a Copeland scroll compressor, and it's much quieter. It's been running flawlessly for a decade of Arizona heat.
I always enjoy your videos, and I always learn a new trick or two! Your bluetooth gauges I am guessing are your favorite brand?
I hate them peanut style pressure switches , and they do fail as well
…
Hi there. I'm just starting out as a tech for residential.
I just want to ask about 410a. If the house is cold below 70f, outside is 75f+. Will subcooling be high or low?
Yeah, I imagine that with the heat in souther ontario, I'm sure that shops and restaurants are having fun making sure they keep things cool on a limited budget.
we always viewing your videos but if we have questions ..your not answering ….bullshit you….close your program
GOOD VIDEO BROTHER.
And I see all them shirts in the background!!! I missed the video Monday, can we buy em yet?
I still can't get it to tell me when you post a video…
Great video. Service area Barrhaven??
how many calls should you Expect to do in a day? Are you in Nepean ?
Least its a Dry heat out west. Now on the East Coast, its a different story. Very, very uncomfortable with high heat and humidity. That long sleeve will be in the trash during summer months!