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Old 08-10-14, 09:19 AM   #34
NiHaoMike
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If those two speeds are really all that's needed, a true two speed motor would probably be a good choice. A VFD will give you many more speeds in between that can be used for more savings in some applications.

Also, if there's already a single speed pump installed, adding a surplus VFD is cheaper than replacing a perfectly good motor. If it's due for replacement anyways, it would probably make more sense to just replace it.
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