Change circulating fan speed?

Old 11-23-12, 05:52 PM
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Change circulating fan speed?

I have a Heil hot air furnace, model # 867.768142, Serial # L922668721, MFR #NUGE075BG01. Had an AC unit installed last July, installer increased blower speed to accommodate AC. I would like to change fan speed to heating mode and, to avoid a service charge, would like to do it myself. The blower speed taps terminal block wire color code colors are different than those shown in the manual. Would be grateful for any help rendered.Thank you
Old 11-23-12, 09:48 PM
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The color codes of the blower motor's different speeds should be on a plate on the motor.
Old 11-24-12, 05:16 AM
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Blower speeds should not be changed without a confirmation of the correct temp rise according to the data plate. Blower speed should be changed by a professional. Also, your furnace control likely has 2 speed taps, one for cooling, and one for heating. They should run on different speeds.

FYI, your furnace is 20 years old (produced in 1992 according to your serial #) and should be inspected by a professional anyway.

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