Multiple Restaurant AC Issues Diagnosed
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- Опубликовано: 25 сен 2021
- Eric Mele gets Multiple Restaurant AC Issues Diagnosed. He investigates several different issues with a restaurant's HVAC/R equipment, including an inefficient A/C compressor and a failed fan motor on a refrigerator.
The readings indicate that the suction pressure is high, around 152 PSI, with an 80-degree return. The temperature split is only 10 degrees, and the unit is running too warm with low subcooling.
When Eric pumps the charge down, he notices that his meter stalls out a bit. Then, he shuts off the blower and checks the suction line temperature. The suction line temperature rises past 91 degrees, meaning that hot gas is leaking back through the compressor. The data affirms Eric's suspicion of an inefficient compressor.
Upon further inspection, Eric notices that the unit has an aftermarket fan motor, which may have damaged the compressor and contributed to the inefficiency that Eric is currently investigating. When running the unit without the blower fan, the suction pressure fails to drop as quickly as usual. So, the compressor is the primary issue, and replacement is necessary.
Eric also inspects another small unit with filthy coils and a fan that won't spin. However, the compressor appears to pump normally. In this case, Eric replaces the fan motor and cleans the system. (As always, he makes sure the motor spins in the correct direction.) None of the bolts fit, however, meaning that Eric must use a set of customized screws. He doesn't put too many in all at once, as he wants to make sure the motor works and spins the right way first.
Once Eric was sure that the fan motor worked as it should, he used a Dremel to customize the remaining screws and mount the motor correctly. He also redoes some wiring and sees if the unit can make temperature. He runs the unit in defrost and checks the amperage as the unit comes out of defrost. The relay appears to draw high amperage; upon further inspection, the relay appears to be working, but Eric still takes the safe route and replaces the start gear.
The belt also has an issue; the belt is loose and runs counterclockwise. Eric replaces the belt, tightens it appropriately, and ensures that it spins in the proper direction. He props the motor up to get the correct belt tension, but the problem is bigger than that; the entire fixture will need replacement.
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Im in hvacr school rn and it’s really cool working on little things in class and seeing how it all comes together like in this vid
Really good video. Please make more of these videos. I love how everything is straight to the point and not talking so much and going off track.
Im in hvacr school and it helps to watch these videos after a lab where I feel like watching these videos I can go back to the lab and slow things down and grasp more of an understanding Thxs man
Great diagnosis on the first split system, you don't see in efficient compressors everyday.GREAT JOB!
Run that motor before you mount it to check for rotation.
Very good video, more please!
Thanks for the video =)
Great video, lol I'm glad to see I'm not the only one that gets these types of jobs 10 min job sometimes turns out to be 2 hour
Great video ! I also found interesting the socket on your phone being magnetic, what brand is the socket you have on your phone ? I need one of those! Thanks
Jumping around on the description.
Did you really try to blame the issue on an aftermarket fan motor?
😂😂 ikr
It's possible if they didn't have enough heat extraction due to low rpms ... but very unlikely that's was the cause
Do you the 13a on the nameplate was for the defrost heaters? That's how it is on regular house refrigerator
At least all your skids pulled out. It seems like every refrigeration call I get, they never do 😂
!!!! Could you please tell me where Eric purchased his magnetic phone case holder. Or how he made the phone magnetic in order to place on the disconnect box to watch his Job Link app. ???!!! PLEASE HELP!!
Right off the back the comp bad look at discoloration of the top of compressor mean been running high liquid line temps which could be early sign of valves going bad
Just curious on the temperature rise on the suction line your testing ,how do you know its not heat transfer from the compressor to the copper line causing the heat rise?
Musta had alota calls.
Got everything running.
Lots of follow up.
😃 I know the feeling of an over due replacement!
Thanks for the video!
🥃🥃🍺🍺🍺🍇🏌🏻♀️
Stay safe.
Retired (werk'n)keyboard super tech. Wear your safety glasses!
Oh I love Eric😺
What about just cleaning the evaporator coil first before anything!?
When you’re pumping it down are you pumping the refrigerant back into the condenser unit itself. Do you close the liquid line valve completely and hold the contact or button in so the Freon pumps into it through the suction side? I want to know because this is how I’m being taught.
@@joejones6842 Yeah I know to use the word Refrigerant instead of Freon. But I work with old timers and I learn their lingo.
Thank you for the reply. Great help!
Super tech, get it!
It's crazy how nasty hvac equipment gets in a restaurant. Cleaned some rtus the other day at a taco place all units were pretty close to the kitchen exhaust fans and all of them were completely caked in dust and oil vapor. Crazy shit is they only do maintenance once every 6 months. Evaps had oily residue all over them like you see on a kitchen hood. Of course the condensers had blankets on them. The worst unit had a brand new condenser next too it like they would rather buy units than increase the maintenance intervals.
Very common is pizza places and cooking restaurants. They get oil inside coils and impossible to clean. Takes 3 times as long. And the fins are wider so more gets into them
Where had this guy been at? Tried looking for his videos but his channel is deleted
PLEASE!!! Let me know where you got the magnetic phone case. Or how you are able to slap your phone up on the box like that. !!!!!!!
Clockwise but from which end of the shaft?
CWOSE=looking at the shaft end= CW
I don't think the temperature clamp test is a good one with a scroll. For one the motor windings very close proximity and there is a internal check valve that will work to stop the bypass in off cycle
What would be your recommended test in this case ?
@@hozerhvac4406 I would use the inability to pump down, lower the suction pressure without blower and won't spike head pressure without condensor fan motor enough to condemn. Obviously if is a heat pump it can get more complicated
@@joeshearer1247 I agree the heat pump aspect throws a whole different aspect... reversing valve ect ect. My problem with this is he was only looking at pressure on the suction line.. well that compressor is very hot by now and is probably flashing refrigerate with the liquid side shut very likely thier is backfeeding through the suction that pressure has to go somewhere.
Gee I wonder how much spoiled food this restaurant served before calling for service. I’m sure techs all have horror (kitchen) stories to tell.🤢
When a compressor or fan has the paint off of it. It won't last much longer
Damn. I'm confused. So isn't that indicative of a failed metering device if the system doesn't pump down without the indoor fan running. Assuming it's a txv at the evaporator.. & what about a maintenance first?
Failed metering device probably wouldn't cause the high suction pressure. TXVs always fail more closed and cause a restriction in my experience. If it failed wide open then you would have no superheat and liquid flooding back.
What tool have ? Blootot gauge??
Fieldpiece joblink kit with measurequick app
3:15 rusted top of the scroll compressor normally means the compressor was running at low Freon situation for a very LONG time.
Not quite, with those LG compressors in the Payne/Carrier units pretty much every one I've seen looks like that. The paint just isn't very good. I have a Payne with an LG in it at home and it looks exactly like that and I know damn well it hasn't been running hot.
Kinda hot up there.
@@epicmegaman12 Have you seen any LG scroll's bypassing like this one? I've never seen a Copeland scroll lose capacity...
👍
Does a scroll compressor have a discharge valve?
dont you love how fan motors almost never come with new hardware 🙃
L5411 Packard
As rusty as the top of that compressor is, the fan may very have caused this issue. That compressor head got very hot over time.
Everyone loves a good shit show.😂😂😂😂
I wouldn't want to eat there. NASTY, Nasty, Nasty.
Tech. Life
Welcome to my world of beat up F&B equipment.Everything is greasy / stinky, half of them are missing grounds and the cooks gritando "me pica, me pica" (the counter bites me when I touch it)
You have a Face ID love to punch but I just concede you make a good tech.
LOL I get jobs like this all the time. because they don't do any maintenance on anything they run everything to the ground.
Run everything to failure and THEN want it all fixed in 1 day WHILE their kitchen is packed and busy. -0- maintenance. Typical dive...