GME80603BN

Dual-diameter tubular heat exchanger • Two-stage gas valve that allows installer to turn on two-stage operation with the flip of a dipswitch • Energy-efficient circulator motor (EEM) • 115V Silicon Nitride igniter designed for long igniter life • Furnace control board with self-diagnostics, colorcoded low-voltage terminals, and provisions for electronic air cleaner and 24-volt humidifiers • Control board stores the last five diagnostic codes in memory; simple push-button activation outputs the fault history to a flashing red LED • Low constant fan allows homeowner to activate the low heat speed to efficiently circulate air throughout the home. • Self-adjusting feature automatically adjusts furnace to high- or low-stage operation based on outside temperature without an outdoor temperature sensor • Certain models available with low NOx emissions