I have two customers whom I replaced the blower motors for them. Interesting and frustrating, in both cases approximately two hours after I left, the motor stopped working again. When I tested the motors, the windings seem OK, but the motors are all very hot, not working anymore, even if directly connected to power line. capacitors are good. I used universal motors(two wires not including the capacitor wires) to replace the four wires motors. Anyone could point out what I did wrong? Thanks ahead!
wxguo1
That's an excellent point.....the cap that should be used with any given motor is the cap that is listed on the motor's label.
There is a methodology for determining the correct capacitor using equipment in an electronics lab.... but the easiest way in the field if you do not know the capacitor value is to try two or three reasonable capacitor sizes, and the one that produces the lowest current draw under identical conditions (same speed, blower door in place, etc) is the one that you should use.
Most of the time if I cannot read the capacitor value on a motor which is already in service, I can go to a similar piece of equipment nearby on the same roof, and sometimes have better luck being able to read that label.
There is a methodology for determining the correct capacitor using equipment in an electronics lab.... but the easiest way in the field if you do not know the capacitor value is to try two or three reasonable capacitor sizes, and the one that produces the lowest current draw under identical conditions (same speed, blower door in place, etc) is the one that you should use.
Most of the time if I cannot read the capacitor value on a motor which is already in service, I can go to a similar piece of equipment nearby on the same roof, and sometimes have better luck being able to read that label.
" I used universal motors(two wires not including the capacitor wires) to replace the four wires motors"
What kind of universal motors you used ? Only 2 wires motor ? It seemed you had used the motors for condenser unit ? If so your universal motors are for 230VAC and it could be a problem if your use it on furnace 120VAC.
I 've used a lot alot of universal motors to replace the OEM ones but I never seen a UNIVERSAL BLOWER MOTOR 120VAC or 240VAC that has only 4 wires.
What kind of universal motors you used ? Only 2 wires motor ? It seemed you had used the motors for condenser unit ? If so your universal motors are for 230VAC and it could be a problem if your use it on furnace 120VAC.
I 've used a lot alot of universal motors to replace the OEM ones but I never seen a UNIVERSAL BLOWER MOTOR 120VAC or 240VAC that has only 4 wires.
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
