On Friday, March 22, 2019 at 2:08:14 PM UTC-4, KenK wrote:
trader_4 wrote in
:

On Friday, March 22, 2019 at 1:39:44 PM UTC-4, KenK wrote:
A friend has a swamp cooler blower with a built-in motor. And that's
all. The motor wires are orange, red and black.

I told him I'd guess the black is common and the other two wires are
for low and high speed. If so correct hookup would be one side of 120
VAC to black and the other to either other wire.

What do you think? I know this is extremely little information to go
on but I'm curious at what you would guess about this.

TIA


--
I love a good meal! That's why I don't cook.

I would agree with your assessment, provided there is no start
capacitor external to the motor involved. You'd think you could just
trace the wires and see where they go, and or use a meter, no?

No start capacitr. But it could have been remoced.

I don't know how a two-speed A/C motor is wired. Perhaps a pair go to a
field winding. Then there is another field winding added to the first
field for higher speed? There is probably little DC resistance in these
windings so a ohm-meter test would be difficult.

Suggestions?



--
I love a good meal! That's why I don't cook.


Just test the wires going to the motor with the fan set to low and high.
That is assuming there is a high low switch.