01-22-12, 04:44 PM | #36 |
Efficiency Afficionado
Join Date: Jan 2012
Location: Michigan, US
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Back to the subject of derating furnaces...
If modulating furnaces only change the inducer blower speed and the gas manifold pressure, I don't see why I couldn't wire a dimmer switch inline with the inducer motor and adjust the manifold pressure on the regulator. The inducer motor seems to be a shaded-pole AC motor, so a dimmer switch should be sufficient to control the motor speed. I would want to use a more sturdy dimmer, not just an off-the-shelf cheapo. I have used those before for this purpose and they don't maintain motor speed very well. The fuel-air mixture could be adjusted with reference to the exhaust temperature and temperature rise over the heat exchanger. |
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