 
Warranty:
Limited-Lifetime Heat Exchanger Warranty
All Other Parts 5 Years
Gas Efficiency: 90%
Documents:
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RGRK Series
Classic 90 Plus with Dual Comfort Control Upflow Gas Furnace
The Rheem Classic Series with Dual Comfort Control two-stage gas furnace features a new two-stage gas valve that delivers fuel to the burner at 1 of 2 rates to maintain the desired temperature. On the coldest days, the furnace will operate at 100-percent capacity. On other days, the furnace operates at 70-percent capacity to help reduce energy bills. This means that now you can have the best of both worlds. Economical light-duty heating on cool days, and real heavy-duty heating power on the coldest nights. All that, and the energy savings of a 90-percent gas furnace make the Rheem Classic Series with Dual Comfort Control a perfect choice.
HEAT EXCHANGER
Awarded three patents, the heat exchanger is renowned for its Reliability and efficiency. It's constructed of aluminized and stainless steel for maximum resistance to rust and corrosion.
GAS VALVE
With the call for ignition, the integrated furnace control then opens the gas valve. The redundant gas valve is a 24 volt slow-opening valve that delivers gas in a regulated flow to the in-shot burners.
IN-SHOT BURNERS
The natural (or optional LP) gas is ignited by the direct spark ignition at the in-shot burners. The in-shot burner's shutter free design requires no adjustments to regulate the air/gas mixture.
DIRECT SPARK IGNITION
Direct spark ignition is an extremely Reliable and efficient way to light the burner. And it eliminates the need for a standing pilot. For added safety, the remote flame sensor constantly monitors the burner flame to ensure it is operating as it should.
ADJUSTABLE AIR SPEED
Thanks to adjustable controls for the blower, your technician can precisely match airflow to the specific comfort requirements of your home.
INTEGRATED FURNACE CONTROL
The "Brain" of the Rheem Classic Series with Dual Comfort Control is the Integrated Furnace Control (IFC) which directs all activities of major furnace components.
Rheem manufactures the most comprehensive, feature-loaded furnace line-up in the heating industry. At the top of this furnace line-up is the Rheem Prestige Series 90 Plus Modulating Gas Furnace with Contour Comfort Control- North America's first truly modulating gas furnace.
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