DIYbanter - View Single Post - Blower motor died on a 18 year old Furnace: Update 2

wrote:

Well, it's been over 24 hours and my home is quiet and warm with the
new furnace motor. I have replaced it yesterday and everything is well
so far. I hope it stays that way.

Now another question. How does one adjust the dampers in a 2 story
house. I understand that in the winter I need to favor downstairs with
the air flow and in the summer the upstairs. I have two dampers to
control the left and right side of the house downstairs and a third
damper to control up/down distribution. I have set the bottom two to
be almost all open and the up/down one to be almost closed, which would
divert most of the air flow downstairs. After 24 hours with the new
motor and these settings the temperature is within 1 degree between
upstairs and downstairs. I am happy, but what do I do in the summer?
Just the opposite? I noticed when installing the motor that the
heating wire went to the high speed and the cooling wire went to the
slow speed on the old motor. I wired the new motor the same way, but
am wondering why is the cooling slower?

It may have come from the factory that way. It's also possible that
somebody was home remedying it and put them back on the wrong terminals.
Another possibility is that a tech switched them as a Band-Aid solution
to high temp limit trips. The list is endless.

hvacrmedic