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when i purchased a fan motor from an ac supply house i was informed that i would need to change the cap from a 5 to 7.5. I had just installed a new 45mfd cap which was already in the unit. do I need to install a second one? and if so how do i wire it in? The motor I took out was a single phase 1/3 hp 1075 rpm 208-230 volt. the new motor has all the same numbers except the fact that it requires 7.5 cap.
 

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You need to install capacitor that the new motor requires.
 

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You do not need to use the old motor capacitor.
 

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The 45 mfd cap you installed. Is it a dual cap. ie has 2 ratings like 45/5 mfd on it and 3 terminals. If so you need a 45/7.5 mfd dual cap.
 
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