Installed Fanhandler speed control with brand new Baldor motor on existing
(older) furnace. At slow speed, the motor makes a high-pitched turning noi
se like a helicopter. If I speed up the minimum speed quite a bit, the noi
se disappears. Also, if I pull out the air filter, the noise changes and d
ies down a bit.
I don't like the look of the existing return connection as it has been shor
tened to 14" wide vs. original 16" for an electronic air cleaner (which is
now an empty box with a regular air filter in it).
I cleaned the squirrel cage rotor before install and carefully switched the
motor so that the support bracket sits as before. The only part I am unsu
re of is how tight to set the strap around the motor. Perhaps I over-tight
I should take some measurements--static pressure for one--but I don't have
a manometer lying around.