air con won't blow
I'm working on a roof unit in which the squirrel cage blower motor won't run. With power off, it spins freely by hand. With power on, the motor hums but does not run, and if I try spinning by hand the...
Forum Discussion
I doubt the difference in uF between labeled value and meter reading will keep it from starting.
By "resistance" in turning the motor, is this with the power off? I just replaced a Coleman (RVP) motor with bearings that kept gumming up. Took it all apart, cleaned shaft and bearings, would run about half a day and stick again. I didn't have time to try to run down some new bearing bushings and just replaced the motor.
I found WD-40 loosened the thing up better than the good Zoom-Spout "turbine oil". On ours it was the bearing on the outdoor fan end of the motor that stuck. When it wouldn't turn freely, it also would not move in and out.
If it WILL spin freely, then please try the spin test Doug described.
I'm fortunate to have a Fluke DVOM that measures uF, it's a "73" I think. But I noticed a number of DVOM that will do this. Beginning about $30 at Harbor Fright.
By "resistance" in turning the motor, is this with the power off? I just replaced a Coleman (RVP) motor with bearings that kept gumming up. Took it all apart, cleaned shaft and bearings, would run about half a day and stick again. I didn't have time to try to run down some new bearing bushings and just replaced the motor.
I found WD-40 loosened the thing up better than the good Zoom-Spout "turbine oil". On ours it was the bearing on the outdoor fan end of the motor that stuck. When it wouldn't turn freely, it also would not move in and out.
If it WILL spin freely, then please try the spin test Doug described.
I'm fortunate to have a Fluke DVOM that measures uF, it's a "73" I think. But I noticed a number of DVOM that will do this. Beginning about $30 at Harbor Fright.
