Help me understand this ceiling fan wiring

[The Cobbler]

We were given this commercial ceiling fan in working condition by a tenant that is doing major renos in a unit .
in the process of cleaning it up to hang it, but I can't seem to make sense of the wiring . It is fully operational but I am confused ( that's easily done)

the feeds to the fan are along the bottom of the picture.

the blk feed goes to the cap & also connects to red on the motor.
the Red feed is unused at the connection to the cordset, but it connects to the other side of the cap and the white on the motor
the white feed goes to the black on the motor
there's no light with the fan nor does it appear to be fitable with a l ight .
all I can think of it's a 2 speed fan , but the fact the cap is not in series has me stumped.
Any help appreciated... also I am hoping we can set it up to a fan control ( 3 speed)

 

[Bert_]

Reversible

 

[The Cobbler]

ok, but why is the cap not in circuit?

 

[Innovate1]

The cap is in the circuit. Bert is right. White is neutral. Power to red or black depending on desired rotation. Like drawing 1 here (colors are different). https://www.bodine-electric.com/blog/connect-a-reversing-switch/ One motor winding is powered directly, the other is powered with a phase shift from the capacitor.

 

[The Cobbler]

got it . I missed the neutral tied to the cap .thanks

 

[larry_g]

Dropbox

www.dropbox.com

Instructions above from the Banvil site; https://banvilfans.com/technical-resources/

 

[cpakalolo]

ok, but why is the cap not in circuit?

The capacitor is in the circuit in both directions. Since it is between the red and the black it works as follows. When black motor winding is connected to line, the red winding is getting its power from the capacitor like a regular psc motor. When line is connected to red, the black now gets its power from the red through the capacitor. The capacitor doesn't know it is working in reverse. You have to use a spdt relay or some kind of proprietary relay from the manufacturer that never allows power to be hooked to both at the same time. The fan needs to come to a complete stop when reversing per the manufacturer. I have used timer switches in an off delay to prevent quick reversals at hotel pools. Usually they had a switch and I added the timer to it. So, green is ground, white is neutral or M1, black is M2 forward and red is M2 reverse. Both red and black go to the switch, but if you aren't going to reverse, why hook them both up. It is better if you don't to protect the fan. I figured people would want to know what is peculiar about this fan setup.

 

[The Cobbler]

got it all cleaned up, sprayed it semi gloss white ( on the underside) . replaced the bearings to get rid of the "ticking noise" and she's ready to hang.
clipped off the red lead since we won't use it in reverse .

you may ask why all the work on an old fan? because the new ones seem to all use a DC control and we are installing this in circuit with an existing AC fan