how do I test a fan motor of central air unit?

Question

central air is a Trane unit, replaced both caps, fan motor, 825 RPM, 200-300 V, 60 HZ , 1/5 hp, Ph 1 GE

Answer 1

If the motor in question is the cooling motor for the condensor outside, it is simple. First a little troubleshooting tip. Check the fuses if you are thinking the motor is bad, but just replaced it. If you replaced it with a used motor make sure the phases are correct. Residential uses single phase so I am assuming it will be residential service. Make sure you didnt put a three phase motor in its place. OK shut off the thermostat, shut off the power to the unit. pull the cover off the unit and check for any loose wires, burn marks, blown fuses, ground, anything unusual. If it all looks good find the relay that controls the motor. It will either be a "ice cube relay" or a manual relay. Ice cube relays look like a little clear box with a small control relay inside. Manual relays will be open,usually with 2 to 3 copper poles showing, in which case you can take your plastic screwdriver handle and push it in momentarily, after you turn the power on, to see if the motor turns. If it is a ice cube relay consult a electrician for the proper jumper setting to bypass the relay. Yyou can always do it the old fashioned way. Take the motor back out and propely hook it up to a external power supply of the same voltage and see if the motor turns. Whatever you do, be careful with electricity, it is not the voltage that kills you, its the amperage. If you do not feel comfortable doing it - DON'T. Good Luck!

Answer 2

Make sure you have voltage to the motor. You need a voltage meter to connect to the wires that go to the motor. If you have the proper voltage at the connection of the motor. You will need to replace the motor. Could be the windings have opened up or possibly the internal overload has gone bad.

Answer 3

If the compressor and the condenser fan come on whilst the unit starts off then that's no longer a capacitor concern-they kick-start up the compressor motor and condenser fan motor by skill of giving a quick burst of better voltage to get those 2 automobiles turning. make effective the fan on suited of the condenser activates whilst the unit activates. and the fan keeps working. If the condenser fan cuts off on an identical time as the compressor is working, the compressor is going into "thermal overload" -overheats, then shuts off to evade injury. you could desire to verify the circuit breakers in case you're experienced in doing so. in all probability the breakers have arced and sustained injury that motives them to holiday. in case you're no longer experienced at this have somebody who's verify them for injury.

Answer 4

You could check the amp draw on a running motor (there is a rating stamped on it) and check for continuity on a non-running motor.

Answer 5

GO WITH FRADERTOA, AND BIGNESS. THEY ARE RIGHT