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Old 09-30-2010, 07:02 AM   #1
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ducane gas furnace fan speed change

what leads do i switch on circuit board?


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Old 09-30-2010, 07:08 AM   #2
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look on the board. It will show low, med, high,Etc... large wires, red, blue black ,etc,


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Old 09-30-2010, 03:13 PM   #3
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Often the schematic for wiring is on back of furnace cover(s).

And, the wires themselves can be labelled. Low/Low Medium/High Medium/High are my choices I believe. The unused wires will be of same gauge and should be capped. If you increase existing speed to a higher speed, by swapping wires, you may find it's noisier at the registers.

To experts on DIYChatroom/HVAC: 1) Does increasing blower speed get rooms warmer quicker? More circulation? 2) Is it true that if motor windings burn out on one speed of a multi-speed fan motor, by switching to another speed you will have a motor with new life (assumed maintained in all other ways)?
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Old 09-30-2010, 05:03 PM   #4
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1) Increasing speed gets more air to farther away rooms but does not do it faster. Furnace can only produce a constant amount of BTUs. Speeding the fan up gives cooler but more air.

2) No. If the motor is overheated or one winding cooked it is in such bad shape it will die soon.
"Cut it twice and it is still too short".
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