Heat pump condensor fan question

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Old 03-17-16, 07:50 PM
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Heat pump condensor fan question

Hey guys,
I need to replace the fan on my Bryant heat pump. It's a 3 blade CW with a 34 degree pitch. On the pitch, can I go with a 36 degree pitch or one that has a 32 or 33 degree pitch? Or is that too far off specification? It's much cheaper to buy the one with the 36 degree pitch than the OEM one. Thanks for your advice.
 
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Old 03-17-16, 09:27 PM
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That's a good question and not one that I can answer for you. Theoretically it would seem that the greater pitch would move more but at the same time it will put more load on the motor.

My forum partner, Houston, may know.
 
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Old 03-18-16, 02:28 AM
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Each fan has the minimum HP rating it can be used with. The 36 pitch can be used with a min. 1/5 hp motor @1100 RPM CW rotation. The motor on my condenser is a 1/4 hp at 1075 RPM reversible motor.
 

Last edited by RobinH; 03-18-16 at 02:47 AM.
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Old 03-18-16, 05:48 AM
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The condenser fan motor was probably pulling the FLA rating with the original fan blade.

I would choose less pitch over more pitch to reduce the chances of the motor dropping out.

Matching the pitch of the original blade would be a much better idea. Decreasing the pitch would likely increase head pressure and compressor amperage. Increasing the pitch would increase fan motor amperage and those things are usually maxed out.
 
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Old 03-18-16, 07:32 AM
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Thanks Houston 204! I'll take your advice. The OEM fan is still available. So I'm going to buy that and install it instead of taking chances on a different fan. Thanks again.
 
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