HVAC Service Call: York RTU Low Superheat High Subcooling (Rooftop Package Unit High Head Pressure)

[@mikediamond353]

I'm watching at 3:15 your explaining filter/driers: "you always want this arrow to point...(pause)...a certain way". Thanks for telling everyone WHICH way!!

[@garypoplin4599]

@@mikediamond353 The arrow on filter/driers indicates refrigerant flow which always points toward the expansion device for the liquid line and toward the compressor on the suction line.

[@EverythingHVACR]

Nice job! I'm not sure about that unit, but a lot of times, you can differentiate circuits 1 and 2 by the evaporator. Stage 1 will feed the bottom, otherwise, especially with a slanted coil cold condensate from the top will hit the warmer coil without both stages running and can drip off the coil, causing water leak issues.

[@JumpermanTech]

Thank you!! I appreciate the feedback & those tips. This unit needs alot of love 😂 Thanks for watching 🔧⚡️

[@electroshed]

Those LG's just sitting there, watching you, plotting their next IGBT failure, seeya tomorrow 🤣

[@JumpermanTech]

👀👀👀Seriously! Those are all ticking time bombs 😂 Thanks for watching 🔧⚡️

[@a123clim]

😂😂😂😂😂 you're right 😂😂😂

[@richritchie5434]

That was circuit 1 that you where work on. Great video as always. Good luck find a leak on circuit #2 . those micro channel nightmares.

[@JumpermanTech]

Thank you for the feedback & tips🙏 Much appreciated. Circuit 2 will be a mission. This unit will need the luck. This unit needs some serious TLC 😂

[@izzybell11]

Another interesting and helpful video. Great job JMT.

[@JumpermanTech]

Thank you very much!! 🔧⚡️

[@garypoplin4599]

3:16 - you didn’t mention it out loud; but, I’m glad to see you cleaned the pipe before cutting it. Good practice!

[@elwoodstelhommme8745]

Why is this a good idea?

[@garypoplin4599]

@@elwoodstelhommme8745 The smallest debris can wreak havoc on a sealed system. Even the bits off your sand paper/cloth can get into the refrigerant lines and make its way to the expansion device or compressor. Also, de-burring the copper with a quality tool is a best practice. The only things you want in a sealed refrigeration system is refrigerant and oil. It doesn’t matter if it’s comfort cooling or refrigeration applications.

[@Mobile.West.Facilities]

Great videos man I'm learning so much Thanks!

[@JumpermanTech]

Thank you so much! Really glad you are learning a lot & a member of this channel. Stay tuned for new videos every week! 🙏🔧⚡️

[@williamserver4332]

Great video. Wow that thing was overcharged

[@JumpermanTech]

Thank you! It really was and by a lot. That head pressure was serious. Thanks for watching! 🔧⚡️

[@johnwalker890]

Good job Jumper.

[@JumpermanTech]

Thank you very much! 🔧⚡️

[@jrh86]

Brilliant and exact luv it 👍👍👍

[@JumpermanTech]

Got to do it right or don't do it at all💯 Thank you!! 🔧⚡️

[@mikediamond353]

At 7:20 you say: "It took about... as much as it could take" That's how systems become overcharged. Also, right before you filled it, you say you "purged" using which method?

[@numan_atl]

Thank you

[@zekenzy6486]

Great Video. Nice job. Thank you for sharing

[@JumpermanTech]

You're very welcome & thank you very much! 🔧⚡️

[@Sc19869]

When you say the system was overcharged, does that mean it had to much refrigerant?

[@averagebloke4474]

Wish I can do Hvac

[@moe5194]

dont wish make it happen u can do it !

[@JumpermanTech]

Like Moe said first, don't wish & put in the time to make it happen. You got this. Even an average bloke can do it 😎🔧⚡️

[@JumpermanTech]

​@@moe5194Facts 💯🤙🔧⚡️

[@moez9396]

Thank you Sir, I like your vedios, and help me a lot. can you share you T-valve info on your gauge? I like it. where did you get it?

[@gordonpotts753]

Just curious what u think,bout cutting the drier on the shoulders with a Sawzall and heating the stubs off. Instead of using a tube cutter

[@scottmaz4063]

Another great job done.

[@JumpermanTech]

Thank you!! 🙏🔧⚡️

[@you166mhz]

this guy is amazing ....

[@JumpermanTech]

Haha thank you! 🔧⚡️

[@elwoodstelhommme8745]

Why did you change the filter drier if the unit was just overcharged?

[@arkadiyburdin855]

Thanks for this video! But what was the main problem of such a big difference SC/SH? Clogged system and filter particularly?

[@JumpermanTech]

It had too much refrigerant in it causing that high head pressure and back pressure issue. Field mistake. Whenever you open up a system it is good practice to replace the filter drier. Especially knowing that the system is having pressure issues👍

[@JumpermanTech]

You're very welcome & thanks for watching!

[@svdleer]

Still at the same hotel? :) keep up the good work with your videos!

[@JumpermanTech]

Haha yes. Right next to all the lovely LG equipment. Thank you!! 🔧⚡️

[@rjeepster8640]

To know which circuit is which I just look at the nomenclature on the inside and it shows you which contactors first stage in which is second stage and follow the wires to the compressor easy Peezy

[@JP-sd2cw]

Circuit is written on the drier, also you said it was overcharged but never said how much you got out compared to what the nameplate is asking for, how you gonna know what the charge should be if you don’t know what circuit your working on?

[@JumpermanTech]

I wrote that on the drier but it wasn't confirmed which circuit it actually was. I took a screenshot of the pressures the day prior and showed it in this video. It is clearly overcharged and by A LOT. The difference between circuit 1 and circuit 2 was only 8 ounces according to the plate. To be exact, use superheat, subcooling & supply/return temps if you can not find the manufacturers documents. Thanks for watching & stay tuned for new videos every week🔧⚡️

[@RoaddogRoaddog]

Great job JMT. What pressure do u run nitrogen at when brazing?

[@av7809]

Very little about 5lbs psi. You can tell while you’re brazing if your braze starts bubbling out turn down the psi. Shrader core out.

[@boduke2299]

What is your opinion on charging a rooftop unit that has removable panels on it that are screwed to the framing that must be removed to work on the unit and to hook up guages to get a reading do you close up the panels as best as you can to get a more accurate reading or not?

[@robertomolina3857]

Great job

[@JumpermanTech]

Thank you!!

[@rupertamine]

Is that the marlton?

[@anthonylane8007]

The superheat was still low....???

[@thesilentonevictor]

On to the next leak search next video lol

[@JumpermanTech]

Definitely! Detective work is needed 😂 Thanks for watching! 🔧⚡️

[@mazenkano1811]

fixing it the right way.

[@daleborg9070]

How much refrigerant did you remove from the system to see how overcharged it was

[@JumpermanTech]

I didn't scale it out but I did scale it in. Look at the screenshot of the pressures the day prior. The head pressure was double of what it should have been. Once we got the charge right, we were ready to roll👍 Thanks for watching!

[@gtpforever]

What was the purpose of changing the filter dryer if all you were doing was recovering/evacuating the system and then adding refrigerant?

[@JumpermanTech]

Anytime you open the system, you are exposing the system to air which has moisture and the filter drier must be replaced. It's just the way to do it and its good practice to do so. Some people skip out on it at times but that's just not proper. Thanks for watching!

[@gtpforever]

@@JumpermanTech but you didn't open the system until you cut the old filter dryer out. That's why I had asked

[@christophergonzales1321]

First stage is the bottom half of the evap

[@JumpermanTech]

Thank you for the heads up!

[@ramonadecoteau2680]

I wonder if they (who ever was before y’all) dumped all the refrigerant in one circuit instead of putting the refrigerant in two separate circuits. That’s why one side was overcharged and the other one had nothing.

[@JumpermanTech]

It's always a mystery. You really never know. I've seen so many hacks and strange things over the years. I like to start with a clean slate. Cleaned coils & proper vacuum/charge👍

[@L8NiteCoffeeSips]

what size is that valve core?

[@ATAKace1]

I heard you have to pay a monthly subscription for some of these wireless gauge apps, is that true with the field piece ones you use? Also does the high vs low side charging and nitrogen flow make a difference with the system being off?

[@JumpermanTech]

I haven't heard about any monthly subscription fees but as far as the Fieldpiece ones I'm using, it's all free. The tool itself is pricey though. Well worth it honestly. Don't think it would make a difference but I typically flow through the high side & it's natural direction being this only does cooling. Thanks for watching!

[@elitss8883]

Why cut it instead of sweating off??

[@mikediamond353]

When heat is applied to the dryer, it will release its trapped moisture back into the system. Cutting it off will keep that same moisture trapped in the dryer.

[@halilcankaya3202]

Why superheat isn't increase . 1.5 is too low

[@Anver_Silyaev]

👍

[@JumpermanTech]

🙏🔧⚡️

[@serezhka2943]

Where is your filter before recovery machine?

[@serezhka2943]

Your recovery can умереть)

[@JumpermanTech]

I should use a flared filter drier. You're right

[@JumpermanTech]

​@@serezhka2943😮😂😂😂