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06-27-2008, 12:11 PM #1Regular Guest
- Join Date
- Jul 2004
- South Alabama
Return restriction and Variable speed fan
I am getting ready for a air handler with a variable speed fan.
It is a 5-ton unit and my return is a 24x24 grille. I've read some stuff on here that says that too much pressure/restriction could hurt the life of the motor.
I know most of the pro's recommend certain "tests" to determine capacity, etc.. but I've never seen or heard of any of the companies here doing that... at least on a house that has already been built and has central a/c. Maybe it is an area thing?
Anyways.. I feel certain the installer will say that we can do whatever I want on the return and leave it at that... Is that a big enough return for this size of a unit. I think my only choice would be to put another return on the other wall if it is not. This unit is in a closet that is on a corner in the central hall.
The unit was previously in the basement with an even smaller return, but a duct leading to a floor grate in another room to provide additional input.