[cjacoby]

It is a BN81 1725/3250 with L1, L2, A, B white and brown wire connections. I get it to run on white on L2, Black on B, but I cannot get low speed to run. What is correct connection for my white, red, and black wires to go to my controller? Thanks

[Stratmando]

So you don't need the Brown?
Couldn't find a BN 81, did find a BN 91:A.O.Smith Electrical Products Company

[cjacoby]

I might need brown. Does it go to my red wire from controller?

[Stratmando]

Can't say,
Look at the Name plate REAL close, or the connection cover for the wire descriptions, I had no luck on their site with your number, For your controller it may only need to use 2 speeds, Need to figure connections still for correct voltage and direction as well.
Look close at name plate. And/Or verify Model Number.

[cjacoby]

Pump Motor label reads
Cat BN-81 Ser. BX 1-28
Wiring shows follows
Low Voltage
Brown-B
White L2

High Voltage
White-B
Brown-A

Pump Duty is 1081/1563
115/230Volt

My controller wires to attach are green, white, black and red.

[Stratmando]

Does it show any lines or connections between your low and high voltage, its only telling part.
You show 2 wires for low and 2 wires for high voltage, but need more info for the 2 speeds.

[cjacoby]

Nothing between the two but a thin vertical line sepearting each wiring diagram. It reads as follows:
Low Voltage
Brown-*B
oL1-Line
White-*L2-Line
0A

High Voltage
White-*B
0L1-Line
oL2-Line
Brown-*A
*= Filled in circle
Non-Reversible

[Stratmando]

Found your Motor, it APPEARS to be single speed. Dual Voltage.:
AO Smith Thru-Bolt Mount Motor - Century - 1 HP - 230/115 Volts - 48Y Frame - Stock Number BN81

[cjacoby]

Can this pump run on the same 115Volt 20 amp circuit as the spa electric heater? Or will it trip the circuit breaker?

[Stratmando]

May work, need to see what the draw is. Still 20 amp protection is needed.
Is the Heater 240 Volts? Not that it matters.
Most heaters draw a lot.

[cjacoby]

Heater is 115 volt with thermostat built in, 1.5 kilowatt rated