[tshane]

I have a Goodman Airhandler AR49-1. The motor is a GE B13400-353 V208-230, HZ 60, 1/2 HP 1075/950. There are 3 wires plus capacitor wires. Purple, Red, Black -

Replacement motor is a A.O. Smith Mod: F48N85A01 with all the same specs just is a 3 speed. The GE had 2 capacitor lines and the Black went to HI, the Red to Low, and the Purple common.

Questions -
The AO Smith replacement motor will use 2 capacitor lines and has 4 lines
The Black is HI - so same connection
The Red is low - so same connection
The Blue is medium - I can just cap and tape correct?
The Yellow is the common

On the capacitor wires the new motor wires are brown and brown/white. There is not a difference in how they plug to the capacitor is there? I can't see anything on the capacitor that indicates a difference from the left to right plug?

Your expertise is appreciated.

 

[Doc Holliday]

Capacitor wires are all the same and there is no difference from left to right on a single run cap such as is the cap for the motor in question.

Whichever speed wire you are not using, blue in this case, can be wire nutted and.or taped off.

Use small wire ties (aka zip ties) to secure all wires so they don't get sucked up into the motor.

 

[tshane]

Doc -
Thanks for the prompt response and confirmation. Just wanted a little reassurance before throw the electricity back on since there is no return on the electrical parts and the whole idea was to try to save a few hundred dollars over paying them to order and put these in.

I ordered the new capacitor with the motor and a new squirrel cage as the tech said to replace it also.

Should still come in 300 - 500 below the techs quote and that is with buying a condensor unit capacitor to have on hand as an extra since thy charge me almost 400 to replace and install that last summer. For a part I paid less than $70 for. Figured it was time to start doing some of these as times are tough but not for these guys evidently.

 

[beenthere]

Capacitor wires are all the same and there is no difference from left to right on a single run cap such as is the cap for the motor in question.

Used as a 4 wire set up capacitor wire goes to which capacitor terminal.

However, if converting a 4 wire motor to a 3 wire set up. It makes a world of difference. The brown with white strip is connected to the same point in the motor as the common is.

In the case of the OPs set up, it doesn't make a difference since he is doing a 4 wire.

 

[Doc Holliday]

Used as a 4 wire set up capacitor wire goes to which capacitor terminal.

However, if converting a 4 wire motor to a 3 wire set up. It makes a world of difference. The brown with white strip is connected to the same point in the motor as the common is.

In the case of the OPs set up, it doesn't make a difference since he is doing a 4 wire.

Explain further, please. A single run cap has no common or run pre determined (marked) so wouldn't the common from the motor just make common on cap regardless of which cap wires, brown and white or brown or both brown or whatever, the two run cap wires specified for a cap from any motor, went to whichever side on a single run cap?

 

[beenthere]

When converting a 4 wire to a 3 wire. The brown with white stripe is not used. The brown is connected to one side of the cap, the common from the motor to the other side, and the common of the line voltage either side of the cap, depending on desired rotation.

Think of where the brown cap wire is connected in the motor.



PS: Rescue motors have the wiring diagram on them. Check one out.

 

[Doc Holliday]

When converting a 4 wire to a 3 wire. The brown with white stripe is not used. The brown is connected to one side of the cap, the common from the motor to the other side, and the common of the line voltage either side of the cap, depending on desired rotation.

Think of where the brown cap wire is connected in the motor.



PS: Rescue motors have the wiring diagram on them. Check one out.

Can't you use both cap wires to the cap, hook the common from the motor to the board as usual and switch the cap wires for polarity?

 

[beenthere]

Can't you use both cap wires to the cap, hook the common from the motor to the board as usual and switch the cap wires for polarity?

Nope.

 

[JJboy]

 

[Doc Holliday]

Nope.

I'm not following you with why the br/wht wire needs to be capped off. I've never seen a cap wire 3 or 4 speed, not used. I've always just used the cap wires from the motor and no problems not too mention the cc and ccw plugs for polarity on most motors so I'm just not seeing what you are saying or why.

Back up in time a few months ago: My last refrigeration company I just left, their star tech and installers installed a Goodman 2 ton furr down. Now this unit only had high and low speed and the same speed for heat and cool. I got sent out there a month after the unit was installed to find the motor running backward and the fusable link crispified. I switched the wires on the run cap and bam.

So why wouldn't it work any other time, such as with a 3 speed with the cap wires from the motor? I have never not used a specified cap wire nor have I ever seen any motor wired such as.

 

[Doc Holliday]

thanks for that, it is ringing a few memory bells.

 

[beenthere]

I'm not following you with why the br/wht wire needs to be capped off. I've never seen a cap wire 3 or 4 speed, not used. I've always just used the cap wires from the motor and no problems not too mention the cc and ccw plugs for polarity on most motors so I'm just not seeing what you are saying or why.

Back up in time a few months ago: My last refrigeration company I just left, their star tech and installers installed a Goodman 2 ton furr down. Now this unit only had high and low speed and the same speed for heat and cool. I got sent out there a month after the unit was installed to find the motor running backward and the fusable link crispified. I switched the wires on the run cap and bam.

So why wouldn't it work any other time, such as with a 3 speed with the cap wires from the motor? I have never not used a specified cap wire nor have I ever seen any motor wired such as.

That motor was wired as a 3 wire . Meaning that the line voltage had a wire directly connected to the cap.

The brown with white stripe, is connected to the same point as the motors common wire. So it is not connected, and is capped off.

Down load Fasco's motor facts sheet/booklet, and you will be able to read able it, and get a better understanding of how PSC motors works.

 

[JJboy]

 

[beenthere]

Fasco has a lot of good info about motors in their booklet.