Last week the tech was out for the annual servicing on a new install last year of an am std 2 stage variable speed furnace (auy080r9v3w6) in the basement and a trane 15xl a/c system with a variable speed air handler in the attic 4tee3f49a1000a).
Heating: The second stage (the one that comes on first) blows too strong and I asked the tech if he could turn down the blower speed on this stage. He didn't seem overly familiar with the unit, and after looking at the informaiton on the panel, he worked out how to change the speed on the first stage and said that the blower speed on the 2nd stage could not be changed. I later looked at the manual, and it seems to indicate that the blower speed on the 2nd stage can be lowered. Is this correct? If so, I'd like to call the back out. The thermostat is 2 stage and is wired to control the stages.
A/C: I was concerned that the a/c was oversized at 3.5 tons for a 1750 sq foot/2 fllor house, even though it is a bit leaky. Contractor said that he did calcs and that it was borderline 3/3.5 (other bids were for a 3 ton). As the unit cycles a bit often and the air is a bit more humid than I'd like, I think that the unit is oversized. I asked the tech if he could reduce the blower speed on the air handler, and if this would help this situation. He said that the variable speed unit should find the right level. Is this correct?