Hi HVAC Experts!!
I have a Lennox furnace and blower for the past 17 years or so... I replaced the blower motor myself about 10 years ago and then again a couple of days ago. So out of 17 years, I replaced the blower in there myself 2 times.. This most recent time, one of the barrings was going out, was making a slightly odd noise and had a different odor coming from it, circulating through the house.. ugh.
My issue is with the current replacement I did a couple days ago.. I believe I installed everything like I should have but I'm having an issue. When I pulled the old motor out and installed the new motor, I noticed that the old motor shaft was easy to turn and would move freely. The new motor was more stiff to turn and stopped pretty quickly - might not be anything, but something to note.
The current symptom I have is when the motor kicked in it started off with an odd sound, then sounded normal. This happened every time the blower motor kicked in, until today. It sounds like normal. Nice and quiet, blowing nicely and everything seems great.. until... a nasty burning smell is being pumped through the vents. I turned everything off, checked it out and the motor is running very hot. Obviously something is wrong.. Either the motor from the get-go, or I totally jacked up the wiring of it.
So I'm asking for some help with my situation. Below is about as much information I though would be helpful to debug this issue.
The motor image below shows the leads coming off the motor. There are two purple leads not shown going to the capacitor:
This is the control panel showing where the leads from the motor are going:
Lennox schematic for the blower, etc. (left-side)
Lennox schematic for the blower, etc. (the rest, right-side)
This is an image of the motor sticker itself. 1/2 hp, 5 speed, etc...
This is the doc that came with the motor. It would be ideal to have different speeds, but just having it on HIGH is fine.
Again, I greatly appreciate any advice and help with this. Otherwise, my current thought is the motor is hosed from the get-go, but if you can confirm the wiring would be greatly appreciated.