Can't locate an adjustment knob/switch/vavle for the buit-in dehumidifier on my furnace. GMC GMPN060-3
This model furnace does not come with a built in humidifier. Humidifiers are normally an optional add on. If you have a by-pass type humidifier it is none adjustable. Water level is normally float controlled and operation is control by blower circuit. When ever the blower runs the humidifier operates when in the heating mode.
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