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23-05-2010, 06:47 AM #1
Replacement Condenser Fan Motor Sizing
Hi all,
I'd like to get your thoughts on replacing a worn out condenser fan motor with a slightly more powerful one.
The unit has a 6-pole, 1/8-hp motor, but those are expensive and hard to find. The motor is labeled 1,100 RPM.
I have a 1/4-hp condenser fan motor I would like to use. This motor is also a 6-pole but is labeled 1,075 RPM. Since a 6-pole motor has a synchronous speed of 1,200 RPM, it can't go over that. So, in the worst-case scenario, the fan would be turning 9% faster with the new motor. I would think anywhere between 1,075 and 1,200 RPM should be acceptable.
I'm not too worried about the possible increased current requirement. The motor is connected to the same contactor that switches the compressor, so it looks beefy enough to cope with an extra amp or two.
Does anyone see a reason why I shouldn't replace the 1/8-hp motor with the 1/4-hp one?
Thanks!
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