Відео

Outstanding as always, Roman! This is great content! If I remember correctly, in your 3 pillars video, I think you stated that the correct range for compressor discharge superheat is 27-72F. In this video at 32:30 I thought I have heard you say the low number is 32. I may be mistaken.

You mentioned ball valves near fan coils. Is an open ball valve near a fan coil a problem and why? We were looking at doing this so we don't have to remove all of the refrigerant when making a repair.

Do you work for the applied side or comfort?

For some reason, UA-cam decided to recommend this to me, despite the fact that I'm a software developer who's never worked in HVAC(?) in my life lmao. Looks like a well made and very useful video for the target demographic! I have a small suggestion though. I imagine the target audience for this video is most likely going to find the video through Google or UA-cam search (rather than through recommendations). Putting the "Daikin" in the video title would probably help that audience find this video. Also, just in case you would find this information useful, I found a channel recently called @RuleofThumbYT - I am NOT affiliated with this guy - who gives really good practical advice for doing thumbnails etc IF you want more views.

is there a way to dowload this software? it will be awsome to train my guys on that!

Interesting. I always just assumed the subcooling circuit's main purpose was to add subcooling in cooling mode since VRV systems can have such long line sets. I don't believe I've seen any literature on this but, the subcooling circuit is why insulating the liquid line is necessary right? It took me a while to understand why the liquid line sweats in cooling mode.

Very Informative 👍🏼

Thanks for all the detailed videos you are putting together - it is highly appreciated. I understand on service checker 4 - you are able to remove your laptop from the service checker and it stays recording while connected to the system. I haven’t tested this - I recently received a service checker 4 and the majority of my experience has been with checker 3. Is there any steps to being able to do this or is it out of the box possible/capable? Thanks

Been wanting to know how to do this thanks!

"Great job on the video! Keep up the amazing work. If possible, it would be really helpful if you could explain in more detail about receiver liquid, subcooling exit, EXV subcool, and also share more about heat pumps in the next video. Thanks a lot!"

Thanks for all your videos on the vrv. Do you use the sd card recording feature on the checker 4? I don't see it on your checker homepage.

thank you so much for your content

Musak popular music but just a piano

Service manual? You mean field knee pad 😂

Thanks for the explanation Roman! I never noticed that the PYDN’s didn’t have the split outdoor heat exchanger.

Need a video of service checker data showing systems that are cross piped or cross wired!

Aloha Roman, I have been trying to educate myself on VRV systems as I serve on an AC committee for a large resort in Hawaii. If there is anyway to contact you directly, I would appreciate having a conversation with you. Mahalo, Randy

Assisto todos seus videos ! Aprendo muito com vc

Hey Roman, can you explain the purpose of the high and low side equalizer pipes on the PYDN’s? Also, what change was made to get rid of them?

You said near the end we don’t listen to you for three hours talking about service checker data. But I think we do.

I am in indianapolis and I have 2 systems, (vrv3 with 3 condensers each) 26 tons, and we have been going through compressors like crazy. I would really appreciate if you could look at some of the data I have and help point me in the right direction. I've been checking the eevs for blow-by but I've only found a couple that have a couple degree differential. My DSH has been 6 to 40 degrees. The SSH 2-10 max. But my subcooling (if I'm calculating it correctly) has been 50 to 70 degrees. I do have a unit coded out while I wait on the replacement standard compressor so that may mean these numbers aren't going to be normal. But I know the charge is correct because I have the original as built with all the info and I just replaced a compressor last week and charged it.

Smashed it Roman. Some good humour too 😂

44:26 🎉🎉🎉😂😂😂😂

Another fantastic video! Keep em coming Roman!

Keep feeding the streets. Lol I’m working on sending over some LG data. A video going over LGMV would be huge. The LG product is all over my Nashville market.

I Appreciate your dedication for sharing this (and many other great VRV/F posts) with the rest of us out there!

Love these videos man. Super informative.

first time visitor, im impressed

I beginning to sleep much better at night Roman. Great video.

Another top quality video mate 👌

Wow, I actually didn’t know that multi module VRV3 logic rotates load between compressors. I have multiple chillers (VRV3 chassis) and I’ve always worried that if they don’t reach ‘peak load’ frequently enough that some compressors are at risk of oil starvation due to cross feeding. Little did I know they take it in turns! As usual, thanks again Roman 😂👍 Can’t believe I didn’t know this, I live in the service manuals 😂

Thanks ROMAN, To understand vrf better with your videoes

Roman calling these dogs out! The people raging on these system becuase they got no idea how to work on them or install them

Im curious i built a system to what the design team had spec they didn't know i have some experience with webxpress so i took there as builts made my own with all the pipe runs for FC units and Mains all the piping checks outs but theres a orange boxs saying to up the 96k to a larger unit, now with being a 10 story building is upping the condensers need, they say no because noone will be running all at the same time at maximum but with the random weather cold ❄️ spells or heat domes would you want to have equipment capable of meeting those loads?

Bang on mate. Another great video. Tom 🇬🇧

Thanks for all the VRV content! We had massive compressor failures at two VRF sites both different brands my former company installed them both. One of the field service reps found high static airhandlers were spec'd with low static duct and plus the airhandlers never had the airflow setup properly. Every ducted unit was moving too much air. EEV pulses were open way too far because the unit thought it needed more refrigerant based on sensors. Lots of shattered scroll plates on all the compressors these units run really hard in heat mode. Its interesting to hear how overcharge can effect these units. I'm guilty of gassing up VRF units just to get them by didn't realize it was that bad of a problem.

When a contractor installs the equipment the AS BUILTS are the key.

What PVE oil would you recommend to add back into a system after a leak occurred, and how much should be added if it isn't constantly reading low oil from the sensor? I see one listed online with an ISO 32 rating and one with an ISO 68 rating.

Great information, as always, Roman. You likely prevented me from making a major mistake in the future. Thank you!

I just cut one open and some of that metallic sludge on the top plate of that compressor is just the metal shavings from cutting it.

Really love the simulator in addition to the commentary!

Great video, keep em coming, appreciate the time and effort in making thses vudeos..👍👍

Awesome video man! Is that refrigerant flow diagram just a PowerPoint? Can it populate live data?

Great and much needed video.

Great rant. What do you think about situations where different versions of the OEM piping laying program gives different charge amount or even line sizes for the same inputs? It’s especially sticky in legal situations.

What would be something to look for if you were getting too much liquid back to the compressor on daikin service checker? Or if you aren’t getting enough oil back?

Love hearing you talk about this stuff! More vids please 🙏🏼

I hope you start doing these deep dives on LG nuances as well.

Roman, when are you coming back to ThermalNetics?

Would you be open to considering starting a satellite office in the Maryland, DC and Virginia area?.