Trane A951X080BD4SA Downflow Gas Furnace 80000 Btu 95% Afue Multi Speed Single Stage

Product Description

The Trane A951X080BD4SA is a single-stage, condensing natural gas furnace rated for downflow installation only. Part of the RunTru by Trane RT Series, this unit delivers 80,000 BTU/h of input capacity and operates at 95% AFUE, producing approximately 76,000 BTU/h of usable heat output. The multi-speed blower motor allows the unit to match airflow to system demand. An integrated furnace control board manages sequencing, diagnostics via a 7-segment LED display, and low-voltage thermostat communication. This furnace is installed by licensed HVAC technicians in residential applications where a downflow configuration is required.

The A951X080BD4SA is designed exclusively for downflow installations, making it suited for applications where conditioned air is delivered downward through the floor or a plenum below the unit. The 17.5-inch cabinet width fits standard platform or closet installations. The unit is a direct-vent, condensing design, meaning it draws combustion air from outdoors and vents flue gases through PVC piping rather than a conventional B-vent flue. It is appropriate for residential heating applications in moderate to colder climates where high-efficiency gas equipment is preferred or code-required.

Key Features

• 80,000 BTU/h input with approximately 76,000 BTU/h output at 95% AFUE
• Single-stage gas valve with multi-speed blower for flexible airflow matching
• Dedicated downflow-only configuration with 17.5-inch cabinet width
• Direct-vent condensing design with PVC flue venting — no B-vent required
• Integrated furnace control with 7-segment LED display for onboard diagnostics
• 5-amp control board fuse and low-voltage terminal strip for thermostat wiring

Compatibility

Designed as an OEM-style downflow condensing gas furnace for residential systems requiring a 17.5-inch cabinet in a downflow orientation. Specific compatible coil and air handler pairings should be verified using Trane or RunTru system-matching documentation prior to installation.

Installation Notes

Installation must be performed by a licensed HVAC technician in accordance with the manufacturer installer guide, local mechanical codes, and the International Fuel Gas Code. Shut off gas supply and disconnect electrical power before servicing or connecting any components. This unit is rated for downflow installation only and must not be converted to upflow or horizontal orientation. PVC flue and condensate drainage lines must be routed and pitched per the installation manual to prevent blockage or freeze damage.

Technical Specifications

• Input Capacity: 80,000 BTU/h
• Output Capacity: 76,000 BTU/h
• AFUE Rating: 95%
• Fuel Type: Natural Gas
• Staging: Single Stage
• Blower Motor Type: Multi Speed
• Venting Type: Direct Vent Condensing (PVC)
• Airflow Direction: Downflow Only
• Cabinet Width: 17.5 inches

Standard Information

• Brand: Trane
• Manufacturer Part Number: A951X080BD4SA