When my air conditioning comes on, I hear a loud buzzing and notice the condenser fan is barely spinning or not spinning at all. I used a Fluke 88 to measure capacitance on the start/run capacitor separate from the system, and it measures within a few percent of the label. I have the full 230v going to the fan terminals, so I assume I have a faulty motor.
My question is how do you choose a replacement motor? I have a GE 5KCP39JFV504S currently, and I'm assuming I would find an aftermarket replacement by a different manufacturer. I know I need a 230v 1/4HP 830RPM CW spinning motor, but other than that I don't know how to shop for one that will fit the blades and cover grate properly.
Re: Selecting Largest Motor
I understand that the heat and A/C are not going to be on at the same time in a residence but I was just wondering about selecting the largest motor for the 25% increase. Even though the A/C may have removed from the service and feeder calculation because the heating load was larger, isn't it true that the A/C will still be used during the summer? If the A/C is shown to be the largest motor load then shouldn't the 25% increase based on the A/C be added to the service and feeder calculation?
It seems the code stipulates that the largest motor shall be increased 25% and added to the service and feeder calculation. So I guess my question is what do you do when the A/C has been dropped from the service and feeder calculation but the A/C is indeed the largest motor?