HVACR Emergency: Commercial Refrigeration Rack System Nightmare (Refrigerator Not Cooling)

[@chrissmith513]

Yikes that's not to fun !!! I hope you go back and clean of those cooling fins 😇😇😇

[@JumpermanTech]

Very interesting call late at night. We did go back and pressure washed the coil and made some upgrades. Follow up video comes out tomorrow😎 Thanks for watching! 🔧⚡️

[@scottmaz4063]

Great job cleaning the coil Zack

[@mxslick50]

Nope, the rack breaker and the panel breaker being the same amp rating (but different brands) will trip at slightly different times, or together as in the case of the short you found here. Usually breakers are coordinated so that the breaker in the rack will always trip first, and the one in the panel will delay slightly to avoid having to reset both. Another thing that affects breakers is how many times they have tripped then reset due to short circuits. A short will slightly (or seriously) burn breaker contacts every time, and eventually raise the contact resistance so high that even under light or normal loads, they will overheat and cause delayed tripping. Overloads have much less of a bad effect, but can wear the breaker out mechanically. Some EE's will specify a higher amperage feeder to the rack panel (in this case, say 50 or 60 amps) to allow for compressor inrush and to avoid a simultaneous trip of both breakers in cases like this. That also leaves room for upgrading the rack or adding on to it.

[@mansourramzey7711]

Tks for updating the work on the same video. It is good to know you fixed it right as always.

[@joshperez7731]

Love your videos jumper man! I learn more from you than i do my own journeyman. Thanks for your uploads!

[@Eddy63]

Nice job JMT ... Good job finding that bad breaker ... Thx

[@Kevin-wj4ed]

Looks like no pm this what happens!!!!!!!!!!!!

[@JumpermanTech]

That is correct. No PM & it is what happens. We offered them a maintenance contract for the refrigeration & air conditioning a year ago but nothing ever took place. Now they are considering it. We will see what happens. Thanks for watching! 🔧⚡️

[@genewheeler6320]

Good job as usuall bro. I retired early. You make me miss maintenance work

[@scottmaz4063]

The city never sleeps brother.

[@ronnym1977]

With as much as you know about electrical, you have the skills to replace that 3 phase breaker at the main panel. $$$$$$$$$!

[@mikewood8527]

That's exactly what I would of done, I'm not calling an electrician for something like that

[@geogreandraws1053]

@@mikewood8527 he probably doesnt have those big breakers in truck.

[@anomalies5543]

@@geogreandraws1053 Didnt matter, electrician came in the morning anyways. Could've bought a breaker and went to fix it himself in the morn.

[@Jimmyjimjimjim]

He could have at least tested the breaker to see if it was bad. I understand not wanting to change a breaker on a live panel tho. Because I have done it on a 277 panel and it’s not fun dealing with the screw down connectors.

[@davidtaylor195]

We had 100 ton Supermarket Racks. All Copeland machines.We did breakers, but building main breakers were done by Electrician. Service breakers were easy.😊

[@michaelmckenna9022]

With wire nuts it's easier access. When wired to terminals tightly, you don't need to access it because it works. At least there are terminal strips. I would have called the manager and had him come in, then I would have turned off the mains and had him change the breaker with my supervision. That way I can say that I didn't mess with the wiring in the building.

[@gekkedirkie]

always fun to go out of the shower, and the phone rings....

[@JoeLiberalism]

LoL .....for me it's right when my head hits the pillow.

[@viper22304]

Love your videos. Awesome work. Thanks for sharing.

[@zekenzy6486]

Great Video. Thank you for sharing. Have a nice weekend. What is meter you're using to check compressor ?

[@Gamemode0127]

wow the condenser coil is totally block. how long that unit not servicing :)

[@joshuasmith973]

7:49. JMan.... he sound like me when I first started bingo building maintenance when he asked if you had anymore in the truck. Lmao. Leave me a couple of them when your done. 😂😂😂 Leave me a

[@dillanclark8496]

Use a shop vac for the condenser, makes it a lot easier getting that mess off the coils. I had a brush and haven’t used it since getting the shop vac, awesome video keep it up!

[@acecreed21]

Holy fuck that coil is insane, the chief of that building should be ashamed of himself

[@guy872]

I don't know why but hotels never seem to want to do PM. Then when it breaks and I say if this was looked at a year ago you could have saved thousands of dollars. Would you like to setup a PM contract? They say we will wait and see. I usually tell them I don't care if they do PM or not, not trying to hard sell them. Its funny, I make more money selling after hours service calls and loading up the parts canon to fix years of neglect.

[@internetpointsbank]

Usually the owner isnt working there and the employees are getting paid so much.

[@ryans413]

When a breaker won’t stay in the on position it’s a faulty breaker.

[@ErickHernandez93]

Seems main breaker welded shut both legs that were rubbing

[@russkiy_3]

Good shit bruv.

[@JumpermanTech]

Spacial Russkiy🤙🔧⚡️ Haha thanks for watching! 🙏

[@1982uno]

Thanks for the video😊

[@robbystuckert8007]

Were those numbers you were reading voltage when you were testing the prongs on the compressors? Sorry just trying to understand more getting into refrigeration

[@rylanbrowne5658]

Test for resistance. Low resistance between windings but the same for all three. He also used a insulation tester from the windings to ground to make sure there are no shorts to ground

[@kennethlobo4420]

Thanks for this video,

[@9bboy0lukk36]

Man I really wanna get into rack systems!

[@ronnym1977]

Is that contactor you replaced a pathway or a load?

[@JumpermanTech]

That contactor energizes one of the compressors so it has a load. Not sure exactly what you mean. Thanks for watching! 🔧⚡️

[@ronnym1977]

​​@@JumpermanTech Oh, okay. Well a pathway is like a light switch, it doesn't carry a load, it's an energized pathway, the load would be the fixture the bulb is attached to, or fart fan, ceiling fan, etc.

[@AA-by7xc]

@@ronnym1977I suppose a contactor is a very light load as energy is consumed by the coil.

[@D3ltaM1cron]

Considered loads because they have a coil

[@ronnym1977]

​@@AA-by7xc Oh, okay!

[@poohbear4130]

It’s a beautiful thing!

[@leebyrne2647]

I like watching your stuff, but as an industrial electrician, I am constantly cringing a little.😅

[@andrewamaya8109]

Why

[@johnd9111]

That's what PM's are for.

[@steveg8337]

You need a hew ajative...

[@thesilentonevictor]

Wire nuts that are not necessary smh jmt NY loves your skillset i must agree

[@moholie]

💯

[@rafaelgomez4304]

24v coil?

[@mxslick50]

Yep, 24 volts is a common control voltage in HVAC, and in the case of 480/277 compressors and fans 120vac is used for control.

[@rafaelgomez4304]

@mxslick50 I've never encountered 24v for refrigeration racks when I did HVACR. Not saying it's not used but in 7yrs of refrigeration I never used 24v coil contractors for the refrigeration side.

[@mxslick50]

@@rafaelgomez4304 It seems to be a lot more common in residential/commercial forced air units for sure. I did a lot of work with Trane commercial HVAC and the controls were 24v. From all the relays I saw in this rack, I can see why they did 24v, as it is easier to design controls and run remote thermostats/sensors when using 24v controls. (As you probably already know, any 120v control wiring has to be treated just like power wiring, but 24v controls can use Class 3 cabling and methods.)

[@rafaelgomez4304]

@mxslick50 yeah on the hvac side, 24v is pretty much all I saw. But on the refrigeration side I think I only saw it once.

[@oldblueaccord2629]

24 common inHVAC setups.

[@scottmaz4063]

JMT TO THE RESCUE CHA CHING OF A CALL.

[@maheradous9257]

Good 👍

[@al6347]

Always something.

[@ILoveKittys78]

😻💚💜💚

[@JumpermanTech]

💜🔧⚡️

[@Akronkangaroo]

Loose breakers mean bad breaker

[@JumpermanTech]

Thank you for your input. Makes sense. Thanks for watching! 🔧⚡️

[@topher8634]

Most branch circuit breakers are 10K AIC (Amps Interruption Capacity or Current) that's the short circuit rating. The overload is the number on the handle. So if both breakers have the same short circuit rating, then either or both may trip. If I'm installing a sub panel, I try to find a main breaker that has a higher short circuit rating, like 22K AIC, so as not to take out a whole panel, but even that's not a guarantee. Shorts are violent and there's a whole lot of current the transformer will let through and a lot of the time it's just a battle of the breakers of which will trip first.

[@jerzyaheardz6939]

Megging a compressor that is of scroll design is not an accurate way of testing insulation integrity. Just saying. Reciprocating yes. Scroll no.

[@LC-qi5ff]

Why is that?

[@Vegas-p1w]

Typical Breakdown maintenance.

[@t.a.servicehvact.a.service3189]

i can belive it you cant check what is wrong and wait for an electisian (conect direct to the panel outside)

[@oldblueaccord2629]

Actually your not a certified electrician its the correct thing to do.