Furnace blower motor RPMs modified... is faster ok?
CALLING ALL MECHANICAL ENGINEERS !!!
I found a form - fit - function replacement blower motor for my Suburban NT-30k furnace. (original no longer avail)
All except the rpms. The new one is 33% faster. I thought that this would be fine, but now I am thinking the fire box running cooler could cause water vapor to not be totally ejected from the fire box?
I have read about corrosive problems that need special design considerations in high efficiency furnaces.
Would these things happen in my case?
Am I thinking correctly or worrying too much?
I dont want to have a rusted hole in the firebox halfway through the winter.
A resistor will slow the motor down, as will a potentiometer. Reducing voltage to reduce motor speed is an accepted method. Just make sure the method used is rated for the current used.
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Meddle not in the affairs of dragons, for you are crunchy, and taste good with ketchup.
Terry
Yes, I think reducing the RPMs is the best solution too.
Going to need several power resistors. Have to drop 4 volts and 60 watts to get supply voltage and RPMs down by 33%. That is if Vsupply and RPMs are linear.
A more efficient way would be a PWM adjustable speed control.
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Rich, KE4GNK/AE, Overkill Engineering Dept.
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