Dual-diameter tubular heat exchanger
• Two-stage gas valve convertible technology allows installer
to activate the two-stage valve with the flip of a dipswitch
• 110V 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 to
high- or low-stage operation based on outside temperature
without an outdoor temperature sensor
• Dual-certified for sealed combustion direct vent (2-pipe)
or non-direct vent (1-pipe) applications
• All models comply with California NOx emissions standards