High Performance HVAC - VRF Part 3 of 4

[@msdarwin04]

Thank you for this great video series Mr Risinger. I had a question about Geothermal HVAC. What is your take on it?

[@alanmajors9100]

Still building the foundation of understanding VRF. Looking forward to bringing it all together with Part 4.

[@rj.parker]

The vast majority of installing companies don't want to even quote inverter based systems. A case in point was when Lennox began marketing these units nationally, the biggest Lennox supplier in San Antonio refused to quote them due directly stated "complexity". Hopefully part 4 will also clarify "ducted vrf indoor units" as opposed to units that are hidden that may look like ducted.

[@johnterdik4707]

Has there been any standardization in the controls since this was create? If yes who?

[@David-jm7mq]

Hey Matt, is there a part 4 to this series? All the other parts automatically came up at the end of each part.

[@David-jm7mq]

Never mind Matt, I found it.

[@nonavy2004]

I had found hard to get a RESIDENTIAL quote in Atlanta.

[@Ariccio123]

11:32 that's either a servo or a stepper, not a solenoid. Solenoids are linear motion, servos use funky analog signals for control, and stepper motors are 100% digital.fun fact: Servos (because they long predate digital control) were used alongside synchros to aim huge battleship guns in World War II. They could even be controlled automatically by advanced analog fire control computers.

[@davidanderson3800]

Alexander - you are incorrect. It is depicting a solenoid that is pulsed on and off frequently to control fluid flow through the joint of the attached piping. Yes a solenoid provides linear motion, but that motion is used to lift a ball off a seat and close it rapidly...thus controlling the fluid flow.

[@Ariccio123]

Ouch, the inverter scroll needs to convert AC to DC, then back to AC?? That's gotta be a huge efficiency hit!

[@thenimbo2]

it's usually above 95%. Far better than on-off control.

[@Scott-sm9nm]

Part 4 - kzbin.info/www/bejne/hXrPe4ualrepfrc

[@zgle]

Good discussion, terrible audio levels.