Blower fan should have more speeds


Old 08-19-19, 07:41 PM
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Blower fan should have more speeds

I have a Norton/Broan 15 kw electric furnace. I replaced the original fan (4 speed - the black wire was taped up, so essentially could only function as a 3 speed, and I only ever noticed it functioning on 2 speeds) with a new fan (it's only 3 speed) but it only runs on high. It has a 240 V relay and 24 V relay, with motor wires going to each one. Is one of them defective, and which one?
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Old 08-19-19, 09:42 PM
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Welcome to the forums.

I moved you to your own thread.
Do you have a model number for that Norton/Broan furnace ?
Do you have A/C in that furnace ?
Old 08-20-19, 03:43 AM
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Please provide manufacturer/model of new fan motor. Is the speed change selection a manual or auto operation?
Old 08-20-19, 08:25 PM
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The furnace model number is 21B15M. It has A/C. I can't read a manufacturer name on the new motor, but the number on it is EM3586. The speed change on the old motor was automatic. I like to have the furnace fan on 24/7 for air circulation. Then as soon as the furnace heating elements or A/C go on, the motor speeds up to a higher speed.

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