Constant Comfort™ IIS 90
Two-Stage Gas Furnace

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Reliable

Direct Hot Surface Ignition System features an advanced silicon nitride igniter for years of reliable starts.

Durable

The RPJ® III primary heat exchanger is made of corrosion-resistant weld-free stainless steel. The unique integrated ripple-edged design forces more heat to the outside surface area for higher efficiencies.

Heating On Demand

Two-stage redundant gas valve and two-speed induced draft blower assembly operate normally at the lower stage and ramp up as needed.

Quiet

Enclosed burner, fully insulated cabinet, and solid door design result in quiet operation.

System Monitoring

State-of-the-art electronic controls monitor system operation and allow for advanced diagnostics, a timesaving tool for technicians.

• Energy-saving high efficiency operation of 92% AFUE.
• Two-stage operation system reduces temperature and humidity swings in the home by heating and cooling more evenly.
• 5 year No Hassle Replacement™ limited warranty* gives you a replacement unit if the heat exchanger should fail within the first five years.
• Lifetime limited warranty* on the primary and secondary heat exchanger.
• 10 year limited warranty* on all functional parts.

*See published warranty for complete details.