On a Bard wall mount heat pump, unit has a bad condenser fan motor. The existing motor is 1/4 hp. Is there a problem with replacing it with a 1/3 hp? ( don't have a 1/4 in stock) Thanks
Using 1/3 hp instead of 1/4 hp any problem?
DeltaTech
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I have run into noise issues when going over the HP size on some units. We replace 1/12 with 1/6 frequently with little problems. Also replace 1/8 with 1/4 now and then. Just be careful you don't have a giant vibrator on your hands afterwords and you should be fine.
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No problem.
The OD coil will never be as clean as new.
You must do this as a matter of course if you expect an older unit to keep up in hot Southwest locations.
The OD coil will never be as clean as new.
You must do this as a matter of course if you expect an older unit to keep up in hot Southwest locations.
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10,209 Posts
When replacing a motor w/ a different horsepower be careful as pecmsg referred to. According to motor mfrg's you can go up ONE size in HP. If you go beyond that "1 size" recommended suggestion then the oversized cond fan motor can/will experience something called an "inverse porportionality" that affects the motor torque and motor temp. I have that "Fasco Facts" booklet and it is a Good Read.
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There in lies the rub....whose to say someone else didn't already go up 1 size last time...and the time before that...and the time before that...
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ur right ,jayguy, it is based on the proper OEM motor size to go by.
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2 very different fans to consider ..mini split with solid state controller and outdoor unit with relays .
Solid state will be controlled by Mosfets and similar controlled devices where break away amperage with larger motors can take out your board.
With the modern inverter style mini’s I would not want to add any heat to the controllers . Replace with exact spec.
Solid state will be controlled by Mosfets and similar controlled devices where break away amperage with larger motors can take out your board.
With the modern inverter style mini’s I would not want to add any heat to the controllers . Replace with exact spec.
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