I have what appears to be a very similar setup to this post:
http://www.diychatroom.com/f17/air-handler-motor-wiring-72607/
Please forgive my long post, but did lots of reading and wanted to give as much info up front since I am asking for help. And being a network engineer for 26 years I try to be specific since I am always being asked vague questions.
But my motor is the original. It was doing a thermal shutdown when I started using the heater this winter. Since the AC fan speed worked fine for the last 31 years (I know!!) and the heater fan speed worked till this winter I pulled it out, checked the wiring and could not decide what the problem was. Since it was the weekend (of course) and we had a cold snap I had to do something to get up and running. I found an old 110v, 1 speed motor in the shop that was also a FRAME 48Y and swapped it out with the 240v 4 speed motor.
After pulling the motor and getting on the bench based on my reading on this site and others I assumed the problem was a bad run capacitor so I ordered a new one from Mouser. It came in and now it is hot and humid this weekend (central texas weather is always a crap shoot) and I replaced the old capacitor with a new one - 5 u, 370V ac. The old one had no markings at all so I made an educated guess based on the motor speeds, RPM, HP, Voltage.etc.
I went to test the motor out and the way I *think* (sigh.. I know) it was wired does not seem to be very happy. It runs on high speed (I am using the "FAN ON" to test) but gets hot. I have tested everything and every combo of things I can think of. I wanted to get some opinions on how it *should* be wired (it was wired for 2 speed before) with my EMERSON K55HXJFA-5105. No diagram on the motor and the RHEEM service plate has lost 1/3rd of the schematics, of course the part with the blower motor wiring is missing. I have searched crazy mad over the net for pinout/diagram for the motor, but no love.
Here is the motor plate:
This is all the wires of the motor, shown with new run capacitor in place:
Here are the 3 wires to the motor from the air handler :
I did some OHM testing of the motor with the new run capacitor based on several documents and a couple of youtube videos. Here are the results in a table:
Based on several questions on this forum to posters here are some additional voltage tests.
This is every voltage combo I could think of from the 3 wires to the motor with AC and FAN on:
And this is HEAT and FAN on:
I have 3 houses out on the compound right now with more to come. I realize I might need to buy a new motor, but I still want/need to learn how to trouble shoot these either way. I have several other pictures but I hit my 6 attachment max, so please let me know if there is something else I can add to this.
Thanks in advance!
http://www.diychatroom.com/f17/air-handler-motor-wiring-72607/
Please forgive my long post, but did lots of reading and wanted to give as much info up front since I am asking for help. And being a network engineer for 26 years I try to be specific since I am always being asked vague questions.
But my motor is the original. It was doing a thermal shutdown when I started using the heater this winter. Since the AC fan speed worked fine for the last 31 years (I know!!) and the heater fan speed worked till this winter I pulled it out, checked the wiring and could not decide what the problem was. Since it was the weekend (of course) and we had a cold snap I had to do something to get up and running. I found an old 110v, 1 speed motor in the shop that was also a FRAME 48Y and swapped it out with the 240v 4 speed motor.
After pulling the motor and getting on the bench based on my reading on this site and others I assumed the problem was a bad run capacitor so I ordered a new one from Mouser. It came in and now it is hot and humid this weekend (central texas weather is always a crap shoot) and I replaced the old capacitor with a new one - 5 u, 370V ac. The old one had no markings at all so I made an educated guess based on the motor speeds, RPM, HP, Voltage.etc.
I went to test the motor out and the way I *think* (sigh.. I know) it was wired does not seem to be very happy. It runs on high speed (I am using the "FAN ON" to test) but gets hot. I have tested everything and every combo of things I can think of. I wanted to get some opinions on how it *should* be wired (it was wired for 2 speed before) with my EMERSON K55HXJFA-5105. No diagram on the motor and the RHEEM service plate has lost 1/3rd of the schematics, of course the part with the blower motor wiring is missing. I have searched crazy mad over the net for pinout/diagram for the motor, but no love.
Here is the motor plate:
This is all the wires of the motor, shown with new run capacitor in place:
Here are the 3 wires to the motor from the air handler :
I did some OHM testing of the motor with the new run capacitor based on several documents and a couple of youtube videos. Here are the results in a table:
Based on several questions on this forum to posters here are some additional voltage tests.
This is every voltage combo I could think of from the 3 wires to the motor with AC and FAN on:
And this is HEAT and FAN on:
I have 3 houses out on the compound right now with more to come. I realize I might need to buy a new motor, but I still want/need to learn how to trouble shoot these either way. I have several other pictures but I hit my 6 attachment max, so please let me know if there is something else I can add to this.
Thanks in advance!