I would like to ask the board what are the things you can accomplish with a VS (variable speed) furnace or air handler. I have the impression that Carrier Infinity makes the best controller, have been wishing and waiting for Trane to leapfrog them, but so far it doesn't seem likely.
I have American-Standard AUD-080-R9V4K, attached to single speed AC. Immediately I can see they have different airflow capability form the ancient Consolidated ones they replaced. My understanding is they *will* deliver the airflow stated in the tables so long as the duct system holds ESP down to 0.9" or less. This is good because my duct system causes 0.6" ESP (used to be 0.7") and the prior Consolidateds flatly stated 0.5" was their max. The nearly flat CFM promised at a given jumper setting, almost regardless of ESP, seems like one big advantage. Is that correct as far as it goes?
The ability to enable Trane/A.S. "Comfort-R" is another benefit I can see, don't know how unique it is. Trane talks it up like it's a great invention, claims 40% better humidity removal if I remember correctly.
Are there controllers which can select from a spectrum of airflow settings, to manipulate the sensible/latent capacity farther? Is that essentially what a top-line thermostat can do to remove humidity? If so would you please tell me what thermostat models I should be looking at. The Honeywell Vision-Pro has striking good looks, I understand the Robertshaw line is very functional but IMO they really need more artistic styling.
Any info you can tell me on best practices with VS air handlers, I would appreciate very much.
Thank you -- P.Student
[Edited by perpetual_student on 09-03-2005 at 02:00 PM]