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01-26-2013, 11:50 PM #1New Guest
- Join Date
- Jan 2013
VFD for a 3 Ton residential air compressor
I really get into idea of making my own custom made water cooled home AC system with capacity control based on how many rooms need cooling.
I'm going to use zoning dampers to cut off the rooms & ECM motor to control the airflow.
But on the ac side I'm not sure yet if I have to buy a copeland digital modulating scroll compressor(which seems to be very pricey for my own project) or put a VFD on a 3phase scroll compressor.
The large enough VFD for 3 ton machine should be around 4HP? I found one on ebay relatively cheap for 135(item #290520222870) & compressor for 260(item #190755360553)
My question is: VFD will be tough enough to carry LRA load of 88A on this compressor? & if yes, then how far with modulating of its speeds i can go up & down?
01-27-2013, 01:00 AM #2"If you can't explain it simply, you don't understand it well enough
"Don't you just love when the flames burn off the wiring schematic?" hvacvegas-HTALK member
On Monday, not even the chickens lay eggs...
01-28-2013, 12:01 PM #3
you will have oil return problems if you try to run a compressor at less than full speed.
01-28-2013, 12:56 PM #4
Are you wanting to use the vfd for a soft start or capacity control?
01-28-2013, 01:03 PM #5Professional Member*
- Join Date
- Feb 2006
- Float'N Vally, MS
I might be easier/cheaper to install an IAQ system.......Life is too short, Behappy!
01-29-2013, 12:14 AM #6
i envy your enthusiasm, but i do not envy your journey...
01-29-2013, 01:01 AM #7
double..If more government is the answer, then it's a really stupid question.
01-29-2013, 01:01 AM #8
I think that by the time you got it all sorted out, you may find that starting with an actual variable capacity system would have been a more economical choice.
For my house, I'm going with a Daikin VRVIII-S system, with a conventional ducted air handler for the main living/kitchen area, ductless wall hangers for the bedrooms, and a ceiling mount for the garage.If more government is the answer, then it's a really stupid question.
01-29-2013, 01:16 AM #9
01-29-2013, 07:16 AM #10
01-29-2013, 12:09 PM #11