If I remember correctly it was a Gree? (sp?). Was it a Gree Flexx system?
I'm actually looking at installing a horizontal discharge inverter outdoor up on my 3rd floor. Kind of an experiment. Going to hook it up to a Carrier brand indoor air handler with no strip heat (can't run the electrical from the basement up to the attic for the strip). They tell me I will get 100% heating down to 5F OAT, and crossing fingers it does LOL. Apparently the advantage to this outdoor unit is it can be hooked up to any indoor air handler or coil (as long as it's using a TXV as a metering device). It's either that or replace what's there, heat pump and 80% gas furnace. Heck, even thinking about a Bosch system as we've had a pretty good track record with them and heat with them is very good.
You brother did it the right way IMO if he's running his whole house on ductless by using multiple outdoor units. Too many guys want to run everything off of one outdoor, and personally feel like it's a mistake for multiple reasons.
Yes, Mine is a Gree VRF. with matching AH.
Gree has come out with what they call Gree flex . While I haven't installed any, from what I've read, it works on the same principle as my unit. it doesn't require a communication wire and operates with any 24v T stat and T.stat wire. it will heat to neg 20-22 deg without any supplement heat as does mine.
While it doesn't get that cold here, since I've had mine installed, it has gotten down to 6 deg for a few days and you never would have known it didn't have any supplemental heat.
I haven't done any HVAC work since selling out several yrs ago, but I still like to keep up to date on new equipment and technology. It's amazing how far equipment has come since the old days....
I have a good friend that wanted a new system to replace his old conventional HP with something newer (inverter system) He was once in the HVAC business and gave it up to go into the chicken business. He now owns several chicken houses and grows out chickens LOL. Anyway, I told him I would install a Gree flex which uses the same size line set as his old unit. This was important as like you, his install was for upstairs and no way to replace the line set or add communication wire.
it's an ODU and matching AH.
I ordered it from the supply house, he picked it up and installed it himself
I spoke with him the other day and he says he loves the system.
My brother has worked for several of the manufactures over the years in some capacity.. Samsung, Gree, mitsubishi, Johnson controls, etc,.
Yeah, sometimes, he knows what he's doing. LOL...
