On Dec 21, 8:09*am, Some Guy wrote:
Just wondering if anyone has replaced their conventional furnace /
HVAC fan motor (PSC, single phase, etc) with one of the new ECM motors
to realize a reduction in your electricity bill.

Does anyone know what the "over-the-counter" cost is of these motors?

Also, do ECM motors generate electrical or RF noise that is either
radiated by the motor or fed back into the household wiring, thereby
messing up AM radio reception?

ECM motors require a control signal in addition to line voltage.
Also, you cannot just wire the power to the motor, it requires a pre-
wired molex plug specifically designed to plug into the motor.
Likewise for the control signal. A control board is also required,
that is, unless you know how to hot wire the motor control signal.

There is however a new ECM design avialable called the "Evergreen AH".
It is specifically designed as a retrofit for PSC motors. I have no
idea how much they cost. They are not rated at this time for furnaces,
air handlers only. This limitation can also be worked around by
someone with the correct skills.

The retrofit isn't really practical from any standpoint, even though
it is possible to do.