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Thanks for highlighting and showing my photo of my SanCO2 system operating in our garage in Tallahassee. It has operated flawlessly in the year plus since installation. We have hotter and more hot water than we had from the natural gas WH that it replaced. It is powered by PV and it's kWh consumption is very low. 30:00.
HVACR Educators and Trainers are often asked to teach on equipment they themselves have never worked on! The conference provides an opportunity to learn from leading manufactures who attend to educate you on these innovations, and help you stay current.
HVAC Excellence is a standards organization dedicated to improving the quality of education in the HVACR industry. Our organization achieves this goal, in part, by validating educational programs, tracking content mastery at each stage of an individual’s career, and providing educators with valuable resources to help them become more effective in their roles. A key part of meeting our mission is providing professional development for those on the front line of HVACR innovation and education to collaborate. I hope to see everyone there!
As a small contractor in the Dallas area that replace propbably 25 evaporators a year, i have never had to replace an outdoor coil and never ran into a leak outdoor from corrosion. All my leaks are from copper evaporator coils that leaks where the copper U-bend gets in contact with the metal plate before the fins. In some case the coils only last 2 years, all residential, different brands, different systems (a lot of geothermal hp and a lot of slim ducts mini split). All the unitary units I install have aluminum coils and are problem free. I'm at the point where i'm looking at spraying some type of sealant to protect the copper coils from corrosion. Not sure what else is out there. I know i'd lose efficiency but homeowners rather have a lower efficient system that no AC when it's a 105F and having to pay hundred of $ to replace a 2 year old coil. Any advise/ideas are welcome. Going to the same houses every 2 years for the same leaky coil feels like Groundhog day. It's by far the most frustrating part of the business.
If we are willing to adopt refrigerants that are sufficiently flammable to require the additional cost and complexity of mitigation against fire and explosion, maybe we should go all the way and just switch to R-290 for residential comfort cooling. R-290 has some compelling benefits, including being dirt cheap and being so environmentally friendly with a GWP of 3 that it can be legally vented to the atmosphere. Given that refrigerant charging and recovery (or venting if desired with R-290) takes place outdoors, taking the necessary safety precautions when installing or working on such equipment would be relatively easy.
Agreed! R290 is most likely the best long term refrigerant option. We will probably never allow R290 to be used in residential split systems due to the A3 classification, but they would work wonderfully in a Air-Water heat pump chiller that pumped water or glycol into the structure. We will likely see them hit the US market over the next few years.
Where would you insert the probes if you installed a heat pump air handler, with the system being a horizontal left, the coil being on the right and the blower on the left side?
Thanks. As an HVAC instructor who teaches A2L I picked up a few additional bits of information requiring me to investigate what I just learned so I can go to a deeper level. Good podcast/video.
My question is, if you open all the damper/vent and achieve 0.50 wc and the furnace is running optimally, but one day granny closes some vents cause she is cold and it ramps up the static pressure to 0.80 wc, wont that damage the blower motor? Is it better to set static pressure at lets say 70% of max to allow for variances? I thought I heard it in another video, but has only come up once that I know of. Thx
I got some esco prep course and it has been no help. I actually forgot that I was told not to do that and that if those of us in our class go that route to speak to our teacher first. To avoid problems. The one I got won't allow me to use any of the stuff I bought until I watch hours worth of stuff I don't need. I don't understand why the product was made that way. I just wanted some stuff to make certain I pass my EPA exam. I'm 90%+ sure I pass core and type one and about 80% on type 2 and about 70% or better on type 3 but I would wish I were above 90 all the way down the line. It's too late to help me, my test is today. But, you guys could improve it for future technicians. I'm doing the test through you guys today.
Inverters are really nothing new. It's been in the heavy commercial and industrial sector for decades now....its only because it's crept into residential market that it's being talked about....
So true. Unfortunately most residential/light commercial technicians, and even educators, are new to inverters and will need education in the fundamentals of their operation.
We would like to extend my deepest gratitude for the ongoing partnership between Fujitsu and HVAC Excellence. It appears that our missions are closely aligned, both dedicated to enhancing technical competency and innovation within the HVACR industry. At HVAC Excellence, we are committed to evaluating HVACR educational programs to ensure they meet established standards, credentialing instructors to verify their retained knowledge, and validating students' proficiency through Employment Ready Certifications. These efforts are critical in maintaining high standards of technical expertise in our industry. We are currently witnessing unprecedented changes within the HVACR sector driven by technological innovations aimed at improving system efficiency and addressing environmental sustainability. To thrive in this era of rapid transformation, embracing change is not just an option, it's a necessity. Understanding that Fujitsu is at the forefront of these innovations, we believe it is crucial to collaborate to advance our educational programs. However, we also recognize the challenges ahead. Instructors often lack knowledge of new and innovative systems, necessitating comprehensive education. Once these concepts are understood, they will require robust training resources to integrate this technology into their programs effectively. While we continually express our gratitude to Mr. Grunstra, we want to ensure that all of you at Fujitsu know how much we value and appreciate our partnership. Your support and collaboration are instrumental in driving the progress of our shared mission. We look forward to continuing our successful collaboration in the future. Thank you once again for your commitment to advancing the HVACR industry.
You guys are awesome…got my universal today…the 608 book you offer is excellent. The staff over there is amazing. Seth has helped me tremendously on a few occasions. Will be coming back shortly to get an A2L cert.
I have installed many of your heat pumps with convential systems and Unico high velocity, why is it when they start up in AC mode they always come on in heat mode, I talked to your tech at Bosch and all they said is that's how they work , when all other brands don't do this, can someone tell me a detailed explanation for this ty Tony
AS FOR I KNOW EVERY MOTOR NEED A CERTAIN ABOUT AMPS TO START THE MOTOR . AND IF A MOTOR IS STROGGINS TO DRAW THOSE AMP TO GET IT STARTED IT WILL EVENTUALLY BURN OUT THE MOTOR. EVEN IT SLOWLY GETS THODE AMP. SO WHAT DO U THINK ABOUT THIS.
What would happen in a scenario where the blower motor fails to come on and the system keeps leaking in evaporator. Can this cause refrigerant to ignite.
If the LFL was met, and there was a sufficient ignition source, you could get an ignition. BUT....A2L ignition is nothing like an A3 ignition, they move very slow and lazy.
Thanks for the video. You mentioned the gas furnace will shut off when refrigerant is detected. The schematics I have show only the 24 volt (Y) circuit to the outdoor unit is interrupted. What model sensor are you demonstrating and is there a schematic available?
This particular system is a Daikin which is using the DragonFly control which does break W. The sensor is a I believe the sensata but I will double check that.
While some refrigerant detection systems may detect multiple refrigerants, not all will do so, and even if capable of detecting more than one refrigerant the response time may not be the same. If needing to replace a failed refrigerant detection system (or sensor) follow the manufacturer instructions to ensure use of an acceptable make and model that will function as intended.
Very well said, gentlemen. Mitsu guy here - 12-24dc fluctuating on S2/S3. Outdoor sends 24vdc, indoor responds with 12vdc. That’s how you troubleshoot. Also, fun fact although I’m not sure if it’s true, but they are able to share the S2 wire because AC travels on the outside of the line and DC travels in the middle.
An important point was missed. The GWP effect is when there is a LEAK! not while it's in the system. When & IF it leaks when there is a fire, it will propagate the fire!!! Also, very important flammable A2L (R32 or R454B) might and could INTERNALY explode. This is true if the vacuum process (must be higher than R410A an A1 class non-flammable, non-explosive class) is not perfect (presence of moisture/oxygen) as when compressed the temperature could reach the lubricating OIL ignition temperature, and in the presence of flammable refrigerant (any A2, A2L or worse A3) the oil might ignite the flammable refrigerants! This possibility will not exist if A1 class non-flammable refrigerants are present. Neil Afram Director of Space Air Ltd. distributor of AC & Heat Pumps since 1980.
It would be great if we could tie all the refrigerant flows of all the units in a building to maximize efficiency. For example, connecting the refrigerator to the heat pump water heater, and the heat pump dryer with the HVAC heat pump.
Great Catch! I am seeing ZE on the newest ones as well.This can is over a year old and was in the first release, I had to special order it . It was labeled as R1234YF but did not come with a MSDS. They are technically both Tetrafluoropropene. R1234YF is 2,3,3,3 Tetrafluoropropene and R1234ZE is 1,3,3,3 Tetrafluoropropene. I will absolutely reach out to Blow Off and verify. I may have to correct this video as well as my flammable refrigerants video from last year. I am sooooo glad you caught that!!!! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-MWD9-aykQtc.htmlsi=6DlYD2LuLyB0JEQZ
Great review! I’m a certified tech support and instructor for Mitsubishi(Yeah, Juan’s TTT class was super fun…), Fujitsu, York, Ruud, and Bosch. Also, recently became a proctor for Esco’s EPA. Mitsubishi hands down has best training out of all those. It’s a lot, especially if you do both M&P and City Multi(including controls), but you will be very confident after you take the classes and start applying your knowledge. I’ve always loved Esco, and I think Esco+METUS would be a great partnership. PS - if you can’t get into a classroom for training, listen to every METUS Tech Show podcast and you’ll receive abou the same amount of knowledge.
Thank you for pointing this out Hassan. I have been researching ductless explosions in Asia that have showed up on RU-vid. So far each of the systems have been improperly installed R290 ductless systems that are not allowed by code in most of the world. I will continue to investigate and do a video once I have better data- Clifton
Clifton and Tom, Thank you very much for creating this video. It shows HVACR professionals how a typical RDS will work, giving educators and trainers a great tool for the classroom.
