universal motors - http://www.hvacmechanic.com/ Forums
Original message
| fluepipe3
 |  "universal motors"
, posted Sat 10 May 20:15  
We are starting to use what are called universal motors to replace blowers and condenser. I understand voltage 110 or 220, thr rpms must be the same, must be same frame(5.0, 51/2,extra) and the rotation direction. I was told that we can increase the hp by a hp
(1/4 if its a 1/5) is this true? Also was told that we could increase the Amps alittle if the don't match, is this true. Before we did the universal thing we were told to call a runner give them the motor nuber and they would go to the supply house and get it and bring it out. We have done away with the runners and went to universal motors. I just would like some guidelines. Thankyou much appreciated.
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Replies:
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| presscold
| "Re(1):universal motors" , posted Sun 11 May 21:35
I believe its better to avoid use of universal motors for condenser fan motors because most of them are bigger in size which can cause less air passing through the coil.( fan blade not in designed location)
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| yuri
| "Re(1):universal motors" , posted Sat 10 May 21:38:
I use lots of Universal motors. Make sure you get the proper matching capacitor(s) for it. As long as the rpm and rotation are correct then there is no problem. An AO Smith universal I carry can give 1/3 hp with 7.5 cap and 1/2 hp with 10 mfd cap. Sometimes the shaft length can be a bit too long on the cond fan type. OEM sometimes fits better. Be real careful you know how to wire those cond fan type as some are 4 wire instead of 3 wire OEM.
Yuri
[this message was edited by yuri on Sat 10 May 21:39] |
| | Houston204
| "Re(2):universal motors" , posted Sat 10 May 22:12:
I've had problems with 1/4hp universal motors over amping on older Trane condensers. Be sure to measure your amp draw and compare it to the motor nomenclature.
Some Lennox blower motors have a 40 microfarad capacitor on them. I would be hesitant to replace them with a universal.
"Tip of the Day" Remember to remove power first.
[this message was edited by Houston204 on Sun 11 May 03:27] |
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