Ask Me Help Desk - New motor blues!

New motor blues!

I have a Trane AC Heat pump unit. The outside motor started to squeal. It has the sleeve bearings in it and they were worn, I tried to oil them up and it lasted about 2 days. So I was looking for a replacement motor and they want a huge amount for one. I was told to just go out and get a motor that has close to tha same horsepower and speed and it will work just fine. So that is what I did. I ordered a similar motor online and just got it yesterday. My old motor has 4 wires coming from it, Red, Brown, Black, Purple. The Red one was not being used. My new motor has 7 wires on it, Brown, Brn/Wht, Yellow, Black, Blue, Red, Purple. My old motor is a single speed, my new motor is 4 speed. I was told to just pick one speed. Does anyone know how I should wire this up? My new motor the Black is HI speed, and the Purple is Low speed. I was going to just plug in the wires by Color the way they were on my old motor to the unit, but thought I would ask here first. I have no clue if all motors use the same color wiring for the same thing. Thanks, Randy.

This motor will not last very long, it needs to be the exact rpm to work correctly.

Quote:

Originally Posted by Joshdta

This motor will not last very long, it needs to be the exact rpm to work correctly.

Really? Well my motor that came out was 825 RPM. The new one on high is 1075 RPM. So I was going to set it on Med Hi. Figured that would be pretty close. My cousin down in Florida that does HVAC work said just get the RPM close to what mine was and it will be fine. I just can't figure out about the wiring. Thank you for your input! Randy.

Your new motor is designer for indoor blower usage NOT for outside condenser fan usage. If your old motor is what you say then you need a 825 RPM condenser fan motor to start with. Yes there is a difference in the motor construction.

Yellow is one side of the 220, then blue for medium high. The brown wires will go to the capacitor.

Quote:

Originally Posted by Joshdta

yellow is one side of the 220, then blue for medium high. the brown wires will go to the capacitor.

Hi there. I hooked the motor up and it does not turn on. I had 3 wires to hook up on the old motor, Black, Purple, Brown. The black one hooked to a box on the circuit board, the Brown and Purple one hooked up to a small round Capacitor?? So what I did was I hooked up the new motor with the Yellow where the old Black one went, The Brown where the old Brown was hooked up, and the Blue where the old Purple was hooked up. I am sure I have it wrong, but I tried! LOL! Any suggestions? I can take a few pics of the whole situation and post them and maybe that would help? Thank you for all your help! Randy.

Also, the motor did come with a separate Capacitor.

Quote:

Originally Posted by rainbowwar24

Also, the motor did come with a separate Capacitor.

I tried to post a few pics, but it wants a URL where my pics are and I am not understanding that. If you would email me at: [email protected] I will email the pics and maybe you can figure out what I need to do. Thank you so much. Randy.

Quote:

Originally Posted by rainbowwar24

I tried to post a few pics, but it wants a URL where my pics are and I am not understanding that. If you would email me at: [email protected] I will email the pics and maybe you can figure out what I need to do. Thank you so much. Randy.

I think I am just going to try to get the same motor I took out. I found a place that I think I can order the one I need. Thank you for all your help!! Randy.

Quote:

Originally Posted by rainbowwar24

I think I am just gonna try to get the same motor I took out. I found a place that I think I can order the one I need. Thank you for all your help!!! Randy.

Your new motor is designer for indoor blower usage NOT for outside condenser fan usage. If your old motor is what you say then you need a 825 RPM condenser fan motor to start with. Yes there is a difference in the motor construction.