SOFTSOUND™ IIS 90

Two-Stage Gas Furnace

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, two-speed induced draft blower assembly, and variable-speed motor 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.

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