Goodman 80,000 BTU 80% AFUE Gas Furnace

GR9S800804CN Goodman 80,000 BTU Gas Furnace

GR9S800804CN is a Goodman residential gas furnace designed to deliver dependable heating and flexible indoor airflow. It provides 80,000 BTU per hour of heating input, approximately 64,000 BTU per hour of heating output and 80% AFUE performance. Its single-stage heating system and nine-speed ECM blower make it suitable for compatible residential split HVAC systems.

The furnace supports upflow or horizontal installation and uses a 21-inch-wide cabinet. It can be combined with an approved evaporator coil and outdoor air conditioner to create a complete gas split system. All components must be properly sized and matched before installation.

80,000 BTU Heating Input

The GR9S800804CN has a rated natural-gas heating input of 80,000 BTU per hour. With its 80% AFUE rating, the furnace delivers approximately 64,000 BTU per hour of usable heating output under standard test conditions.

AFUE represents the percentage of fuel energy converted into useful seasonal heat. An 80% AFUE furnace transfers approximately 80% of the fuel’s energy into the conditioned space, while the remaining portion exits through the combustion venting system.

A professional heating-load calculation should be completed before selecting the furnace. Climate, insulation, windows, air leakage, ceiling height, ductwork and building construction all affect the required heating capacity. An 80,000 BTU furnace should not be selected using square footage alone.

Single-Stage Gas Heating

The GR9S800804CN uses a single-stage gas valve. When the thermostat calls for heat, the furnace operates at its available heating capacity until the indoor temperature reaches the selected setting.

This straightforward design offers familiar operation and service requirements. Correct sizing remains important because an oversized single-stage furnace may cycle too frequently, while an undersized furnace may struggle to maintain comfort during periods of high heating demand.

Nine-Speed ECM Blower

The GR9S800804CN includes a nine-speed electronically commutated blower motor. Its available speed settings allow the installer to coordinate airflow with the heating application, evaporator coil, outdoor air conditioner and duct system.

This model supports up to 4 tons of nominal cooling airflow under appropriate operating conditions. Actual airflow depends on the selected motor speed, evaporator coil, filter condition, duct static pressure and complete system configuration.

The 4 ton designation describes the blower’s maximum nominal cooling support. It does not mean the furnace produces four tons of heat. Heating performance is determined by its 80,000 BTU input and approximately 64,000 BTU output.

Upflow or Horizontal Configuration

The GR9S800804CN is designed for upflow or horizontal installation. In an upflow application, return air enters through the lower section of the cabinet and conditioned air exits through the top. For an approved horizontal application, the furnace operates on its side.

The installation orientation, return-air arrangement, combustion air, venting and service clearances must follow Goodman’s instructions. The furnace should not be installed in an unapproved position.

This product is intended for compatible site-built residential applications. It should not be installed in a manufactured or mobile home unless the equipment certification specifically permits that application.

Durable Heat Exchanger and Ignition

The furnace uses a heavy-duty aluminized-steel tubular heat exchanger designed for dependable heat transfer and resistance to repeated thermal cycling. A single-stage gas valve regulates fuel flow during operation.

A durable hot-surface igniter electronically lights the burners when the thermostat requests heat. This eliminates the need for a continuously burning standing pilot. The single-speed induced-draft blower supports combustion airflow and moves combustion gases through the approved venting system.

The self-diagnostic control board stores fault information to help qualified technicians identify operating problems. Color-coded low-voltage terminals also help simplify thermostat and accessory connections.

Cabinet Dimensions and Construction

The GR9S800804CN measures approximately 33⅜ inches high, 21 inches wide and 28 inches deep. Its listed shipping weight is approximately 132 pounds. The wide cabinet must be matched with an appropriately sized evaporator coil or transition.

Cabinet dimensions are not the same as the required installation clearances. The contractor must provide sufficient room for return air, supply ductwork, combustion air, venting, filter replacement and future maintenance.

Electrical and Gas Requirements

This Goodman furnace operates on a 115-volt, single-phase, 60 Hz electrical supply. Published specifications list a minimum circuit ampacity of approximately 11.3 amps and a maximum overcurrent device of 15 amps.

The gas connection is 1/2-inch FPT. The factory fuel configuration must be confirmed before installation. Conversion to propane requires the appropriate manufacturer-approved conversion kit, gas-pressure adjustments and professional combustion testing.

Electrical wiring, grounding, gas piping and overcurrent protection must follow the furnace nameplate, Goodman instructions and applicable codes. All gas connections must be properly inspected and tested for leaks before operation.

Venting and Emissions Requirements

As an 80% AFUE furnace, the unit requires code-compliant combustion venting. Vent material, diameter, termination, combustion air and clearances must follow the installation manual, National Fuel Gas Code and local regulations.

This product is listed as a non-Low-NOx configuration. It may not satisfy emissions requirements in certain regulated jurisdictions. Local furnace efficiency, fuel and emissions requirements should be confirmed before purchase.

Compatible Cooling Equipment

The GR9S800804CN is the gas furnace only. It does not include an outdoor condenser, evaporator coil, thermostat, refrigerant line set, filter cabinet, venting materials or installation accessories unless those items are specifically included in a package.

For central air conditioning, the furnace must be paired with a compatible evaporator coil and outdoor condenser. Coil dimensions, refrigerant type, blower airflow and the certified equipment combination must be verified before ordering.

The furnace may include controls designed to support newer refrigerant safety requirements, but refrigerant does not circulate through the furnace itself. The coil and outdoor equipment determine the complete system’s refrigerant type and SEER2 rating.

Professional Installation Required

The GR9S800804CN must be installed and commissioned by a qualified HVAC professional. Installation includes gas-pressure adjustment, combustion testing, venting, electrical wiring, blower setup, temperature-rise verification and safety-control testing.

Review the official Goodman gas furnace information and browse more HVAC equipment from Xpress Supply. Confirm the fuel type, heating load, cabinet width, local emissions requirements and complete equipment match with your contractor.