Introduction to VRV/F Systems with Roman Baugh

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HVAC School

HVAC School

Күн бұрын

Roman Baugh gives the Kalos techs an introduction to VRV/F systems. Variable refrigerant flow (VRF) or volume (VRV, Daikin) systems are a specific type of HVAC equipment invented by Daikin. The same superheat and subcooling principles apply, though there are a few more moving parts.
VRF systems are more like VFDs that take AC voltage, convert it to DC voltage, charge capacitor banks with the DC voltage, and use pulse-width modulation to run the compressor at different hertz (at 168 different speeds). The variable-speed nature moves varying amounts of refrigerant to meet the exact demand of indoor units and run efficiently. These systems supply a specific amount of refrigerant to a given indoor unit to meet its required capacity. The indoor and outdoor units constantly communicate (via a PID loop) to make this possible.
VRF systems may use either 2-pipe or 3-pipe heat recovery. Those pipes represent refrigerant lines moving into and out of the heat recovery box, which generates the liquid needed for the indoor units. It has a branch collector box that skims refrigerant. Hot gas goes to the unit(s) calling for heating, and it condenses to a liquid in the indoor heat exchanger, which then goes to the unit(s) calling for cooling.
Capacity varies widely among VRF systems. In some cases, two outdoor units can handle a combined 40 tons of capacity. Higher-capacity systems have higher compressor and fan speeds, usually with larger compressors. Compressors and inverter boards may be refrigerant-cooled (using liquid refrigerant). VRF indoor units vary quite a bit in shape and size, coming in wide and slim, ducted and ductless varieties. Roman covers the features, advantages, and disadvantages of existing models as well as the unit nomenclature and clearances.
Roman also covers copper tubing, including REFNET kits and Y joints, as well as proper installation of those and some general brazing tips to reduce turbulence. He also discusses oil management, especially as it relates to piping consideration and refrigerant turbulence in the copper tubing, as well as oil return mode and traps. On the installation end, it is critical to remove the shipping bracket from the compressor and eliminate cross piping. Flaring, pipe lengths, pipe diameter, and proper piping support are other considerations for VRF piping and installation.
Flowing nitrogen while brazing is important in all systems to prevent the buildup of oxides and clogged screens, but the copper oxides can damage electronic expansion valve needles, which can lead to oil loss in the compressor and catastrophic failure.
Roman goes through the process of installation, including the pre-construction phase and jobsite considerations when installing VRF systems. He also explains the difference between communicating systems (including VRF/V systems) and 24v systems, and he covers control circuit terminal designations on VRF systems.
This video also covers very basic elements of service and troubleshooting, including how to think about using the correct tools for the job. The basic starting points for VRF troubleshooting include temperature in and temperature out. Temperature sensors are common fail parts, and it's important to stay on top of those, as failed temperature sensors can cause catastrophic failure in the long run. Roman also ends on a note about the importance of reading the manual to assist with troubleshooting. He also explains the importance of pulling and weighing out the refrigerant charge before adding charge to a VRF system.
Roman's tech tip about troubleshooting inverter boards: hvacrschool.co...
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Пікірлер: 72
@CM-ou4zr
@CM-ou4zr 7 ай бұрын
Much needed class. Thanks
@deanwalker3809
@deanwalker3809 7 ай бұрын
Roman, You are incredible. We need videos of you going through checker data of good systems and bad systems
@americanpatriot9942
@americanpatriot9942 6 ай бұрын
Roman is amazing I love the way he explains things!..Please post the service and troubleshoot from him!
@jasonjohnsonHVAC
@jasonjohnsonHVAC 7 ай бұрын
Being in heavy commercial and industrial...its nice to see some content thats directly related to my day to day experiences. All information is valuable information...its even more nuce when its right up alley. I know you especially have extensive experience with Daikin. I just purchased the LGMV wifi module to interface with them. Thanks for putting this video out there Roman *** MITSUBISHI HEAT RECOVERY.....YOU WILL SEE A DRAIN LINE COMING OFF THE BRANCH BOX ***
@alnonymous9361
@alnonymous9361 7 ай бұрын
I originally trained on the seven lights. I still speak binary. I fixed a lot of botched installs back when reflok was still the preferred method for Daikin, (glad that went away). I spent more than half my life on earth with a system in mode 21. Read the fantastic manual!
@jstiles82
@jstiles82 7 ай бұрын
This is Gold! Thanks for posting it. Learning every day😊
@YaakovNYC
@YaakovNYC 7 ай бұрын
Daikin high static MQ and OA units are braze and bolt/gasket type. Not flared. Great video as usual Roman
@brianmcdermott1718
@brianmcdermott1718 6 ай бұрын
Good day Bryan, Roman Baugh gave a super great class👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍. We need mor of these. Thank you Bryan.
@MattBruner-fh3jg
@MattBruner-fh3jg 6 ай бұрын
Excellent. Thank you Roman!
@frankminisplitking
@frankminisplitking 7 ай бұрын
Super awesome skim through the VRF/VRV world. Also really cool how Daikin does auto-addressing I mostly work with Mitsubishi, addressing is a pain… especially how they sometimes switch the dial… first digit/second digit left/right but sometimes right/left… haha!
@po65231r
@po65231r 7 ай бұрын
Hope to see the next class of this 🤞
@alexandergorelov2515
@alexandergorelov2515 7 ай бұрын
Mr Baugh, thanks a lot for your video!
@rj.parker
@rj.parker 7 ай бұрын
Great seeing some new material
@ccthepope
@ccthepope 7 ай бұрын
I have learned so much. Thanks!
@MrWaynesea
@MrWaynesea 6 ай бұрын
Great presentation. You brought out so many useful points.
@dylb8801
@dylb8801 3 ай бұрын
Please up load the rest of this lesson with roman ASAP. The man is the GOAT
@charlespleydell6746
@charlespleydell6746 3 ай бұрын
He's a very good communicator and breaks things down into simple concepts!
@matizar.climatizacao
@matizar.climatizacao 7 ай бұрын
Great lesson. Regards from Brazil
@juniorlemorin1425
@juniorlemorin1425 6 ай бұрын
Thank you very much, you’re amazing
@RobertoCarlos-re3uw
@RobertoCarlos-re3uw 3 ай бұрын
THANKS HVAC school team Im a HVAC technician i learnt a lot from this channel.this is what I was expecting from you desperately.eventually its there thanks a lot fr that.i hope n wish u upload more videos on VRF commissioning and maintenance
@jasonkeys1661
@jasonkeys1661 Ай бұрын
Australia here i appreciate these ..Much love .
@OrlandoPerez-vy6oy
@OrlandoPerez-vy6oy 3 ай бұрын
Just started my journey in HVAC. I been doing Industrial Automation for 8 years now. Hopefully this goes well, looking forward to learning this.
@salv638
@salv638 3 ай бұрын
I have really enjoyed this video very very good information here I am going to continue watching them I learned a lot but just taking this video a few times and writing stuff down questions that I've had thank you again
@dakotaashwood4600
@dakotaashwood4600 6 ай бұрын
Freaking awesome, I knew nothing about this except for an introduction Mitsubishi class I took that was spread way to thin over two days.
@vinhtran4886
@vinhtran4886 7 ай бұрын
Good information. Thank you.
@marinermerrill3884
@marinermerrill3884 7 ай бұрын
Man this was great! Learned a ton!
@dominickg7370
@dominickg7370 Ай бұрын
Excellent info thank you for your time
@eastcoast186
@eastcoast186 7 ай бұрын
Very informative video thanks
@xaviermanning9311
@xaviermanning9311 6 ай бұрын
thank you
@keithglynn9237
@keithglynn9237 7 ай бұрын
Sorry, but im not a fan...as soon as we set foot on two new accounts we found a large multi unit vrf system that has a refrigerant leak within a massive bundle of refrigerant lines all grouped together in a large tube type enclosure, and none of the circuits are marked as to which units they connect. They are also completely covered with insulation. The other account has a twin compressor system in the condenser, one compressor being a variable speed unit. We learned that multiple compressors have been replaced along with the speed control boards. We were told they should be replaced as a set.We have yet to investigate what the cause of failure is. We also learned that the 2nd stage compressor will not run at all if the 1st stage seizes up or becomes inoperable for any reason. We also had a system that was acting up from the communication wire picking up electrical noise. These units seem to work well for a few years, but when they misbehave, they are the worst. Some of our older acounts have these units that blow up power supply boards and refuse to start if the condenser fan motor fails but shows no fault. I found out by coincidence by giving the fan a spin and the unit started right up. The last thing I will mention is that many customers run these at low speed for long periods so the evaps load up with mildew, even with pan tabs, and then they need to be nearly completely disassembled because the long plastic blower wheel fills up with dirt and mold and goes out of balance. Imagine trying to take one of these apart in someones beautifully decorated office with fancy carpet.
@AJ-ox8xy
@AJ-ox8xy 6 ай бұрын
It sounds like someone didn't install it right and people in the building didn't treat the system with proper respect and care it should have. These systems are the future, because efficiency is what the powers that be are chasing as the standard for HVAC systems. Especially as mini split and heat pump technology grows and eventually replaces old heating and cooling systems along with eliminating ductwork in homes etc. These systems will continue to get integrated into commercial and residential spaces.
@matttzzz2
@matttzzz2 4 ай бұрын
Let me guess, it's an LG
@chrissandoval7
@chrissandoval7 2 ай бұрын
I disagree. I have seen many vrv/f systems that have the same issues you are describing and they are all a result of the same issue. Poor installation. Daikin is very particular on a few things, but if you have a team installing these correctly and abiding by the start up procedure they will last for years. Don’t give up on them, just educate yourself. And as for the dirtiness of the fan coil, that’s on the customer. But if they’re maintained by a professional and they educate the homeowner/property management on the issue then this isn’t a problem.
@harryschrysan3183
@harryschrysan3183 Ай бұрын
Mostly it's bad install practices. I have ZERO experience on VFR and just trying to learn how it works as I am not willing to work on that. Honestly, HVAC has SO many fucking systems to learn that is impossible to be expert in every single system. It's not bad to have a greater idea on what's what thought.
@stueyknuxx
@stueyknuxx 6 ай бұрын
Great info !
@nathanhurst5155
@nathanhurst5155 6 ай бұрын
Phenomenal
@NotOurRemedy
@NotOurRemedy 7 ай бұрын
Dude when did you start working for kalos????
@RomanBaugh
@RomanBaugh 7 ай бұрын
Hey, I started working at Kalos 9 months ago!
@عبدالمجيدالعك
@عبدالمجيدالعك Ай бұрын
Thanks for all this effort mr, I'm abdulmjed from Syria and trying to learn about this system could you please guide me to the next step cause here In Syria we don’t have that sources and I can't afford paid courses and thanks a million again with all love.
@gilbertmark5834
@gilbertmark5834 Ай бұрын
Really appreciate it ..
@616Haggard
@616Haggard 6 ай бұрын
Why are liquid line dryers not required with these types of systems? Mini splits, etc. If the line sets have been open to atmosphere, despite being vacuumed, there’s zero concern with moisture?
@RomanBaugh
@RomanBaugh 6 ай бұрын
These types of systems are dependent on refrigerant flow. Filter driers cause too much of a restriction on that variable flow discussed. This is why best installation practices are so critical on VRV/F.
@616Haggard
@616Haggard 6 ай бұрын
Makes perfect sense. Thank you
@howgodblessesme
@howgodblessesme 5 ай бұрын
Great video!! I love the VRF concept. I think that I'll choose that niche for my career. Do you have a link for those manufacturers' discount catalogs? I want to spec my house with vrf. Thank you very much!
@abrahammanyang5313
@abrahammanyang5313 3 ай бұрын
great video
@Raphael_NYC
@Raphael_NYC 7 ай бұрын
Fanastic. Thank you. raphael nyc
@rishavpoudel
@rishavpoudel 4 ай бұрын
where can i find more of his classes? Would really appreciate getting the chance to learn more from Mr Baugh
@rajivsingh9788
@rajivsingh9788 Ай бұрын
Very Good Sir, please explain of other manufacturer like LG, Samsung, Toshiba, Hiatchi, Mitsubishi specially in terms Heat Recovery system .
@TAGUPNBLUE
@TAGUPNBLUE 2 ай бұрын
On flaring I use a double flare just like they use in hydraulic lines with nylog and a torque wrench because of the high pressures they use those in brake lines
@CurtisBryan-y1e
@CurtisBryan-y1e 7 ай бұрын
🔥🔥🔥
@treefrogs2894
@treefrogs2894 2 ай бұрын
Put our oil separator in the system for security purpose. It will reduce the warranty expense long-term for the manufacturer
@AdamDavisEE
@AdamDavisEE 7 ай бұрын
Is complexity and cost the only reason we haven't moved toward whole-building heat pump systems that include the fridge, freezer, hot water, pool, oven, dryer, etc? For residential uses I expect it's just expensive to build and maintain, but half the large appliances in the home (and business) have a need to move heat into or out of something. Aside from cost, does it have to do with the operating temperatures, then? The operating parameters for a system designed to heat water to 150F from ambient couldn't efficiently be used to cool a freezer to 0F?
@timothyrichardson8567
@timothyrichardson8567 2 ай бұрын
So I have a question Why does these units don't work well in the Midwest part of the U.S.A. due to the temperature drops to -10 below or -20 below .?
@AMITSHARMA-ri2fw
@AMITSHARMA-ri2fw 7 ай бұрын
@garypoplin4599
@garypoplin4599 7 ай бұрын
9:18 - It seems there is only one flaw in this presentation (even though this presenter will go down as one of the best in the industry): it’s supposed to be, “Who’s on First; What’s on Second; I-Don’t-Know’s on Third!” Just sayin’ . . .
@treefrogs2894
@treefrogs2894 2 ай бұрын
Oil separator oil separator oil separator right on the discharge of the compressor or separator just like what they use in low temperature system
@JohnHernandez-e6v
@JohnHernandez-e6v Ай бұрын
Perez Cynthia Hernandez Larry Jackson Michelle
@roydonesdavidson836
@roydonesdavidson836 Ай бұрын
Clark Christopher Garcia Shirley Thompson Thomas
@cadamham
@cadamham 3 ай бұрын
Cool stuff and great opportunity for techs to improve their skills but lowest bidder is going to win an overwhelming majority of these jobs and give it a bad name the more popular these installations get. Can you afford the opportunity cost to have your A+ techs spend countless hours on someone else’s train wreck in the middle of summer when there’s plenty of easier money to get. Also, these will be commercial accounts with 30-60-90 day pay terms if you ever get paid
@AntoinetteFanny-l8s
@AntoinetteFanny-l8s Ай бұрын
Moore Scott Williams Brian Wilson Angela
@ObadiahCorey-u7y
@ObadiahCorey-u7y 27 күн бұрын
Thompson Elizabeth Wilson Gary Smith Anthony
@BerthaSexton-c5o
@BerthaSexton-c5o Ай бұрын
Miller Jose Wilson Ronald Allen Laura
@MacadamMarcus-y1x
@MacadamMarcus-y1x 25 күн бұрын
Jackson Edward White Ruth White Dorothy
@AldridgeSalome-e4e
@AldridgeSalome-e4e Ай бұрын
Harris James Wilson Laura Perez Dorothy
@GddbHdhd-gb4wl
@GddbHdhd-gb4wl 27 күн бұрын
Martin Michelle White Shirley Wilson Sarah
@adrianbrown7586
@adrianbrown7586 4 ай бұрын
Variable refrigerant volume units and variable refrigerant flow units are junk
@KebbyLL
@KebbyLL 4 ай бұрын
u probably don't know how to use it or design it properly. it has its own unique application. not every system is perfect.
@joelmcneney5366
@joelmcneney5366 Ай бұрын
call it OCC. overcomplicated crap
@timrob0420
@timrob0420 6 ай бұрын
LG sucks
@MelindaGomez-r6m
@MelindaGomez-r6m Ай бұрын
Lewis Donna Taylor John Lopez Amy
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