From inside (document excerpt):
Product Data ® 58TMA WeatherMaker® 8000 2-Speed High-Efficiency Downflow/Horizontal Gas Furnace Input Capacities: 65,000 thru 125,000 Btuh Two-Speed Heating for High-Efficiency Gas Furnaces Carrier continues to lead the industry with our new WeatherMaker® 8000 Two-Speed Induced-Combustion Gas Furnace. Our furnace operates at 2 different speeds which provide outstanding home comfort. This furnace is built with the most advanced manufacturing equipment processes and technology available in order to ensure top quality.
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Packed into the cabinet are the industry’s foremost dealer and homeowner features. These 2-speed, induced-combustion, gas-fired furnaces offer not only low installation costs, but fuel economy as well–delivering an Annual Fuel Utilization Efficiency (AFUE) rating of 80.0%. The Carrier WeatherMaker 8000 Two-Speed utilizes a hot surface, silicon carbide ignition system to save energy and increase reliability. Our engineers have incorporated the patented S-shaped 4-pass heat exchanger, a soft mount 2-speed inducer assembly, and a 2-stage slowopening gas valve to minimize sound level. The Super-S heat exchanger provides better heat transfer while enabling us to make a compact furnace, providing more room in closet, utility room, and short basement installations. The heat exchanger is constructed of aluminized steel and is backed by a 20-year Limited Warranty. The Carrier WeatherMaker 8000 Two-Speed Gas Furnace will meet your home heating requirements. DOWNFLOW HORIZONTAL 1996 Carrier Corporation Form 58TMA-7PD This furnace family provides the widest range of heating capacities available. The superior attention to cabinet detail is obvious. The Carrier WeatherMaker 8000 Two-Speed features 1-piece, seamless, wraparound construction. There are no spot welds on the exterior surfaces of the furnace. There is also double protection for the cabinet. First, a galvanized steel substrate provides resistance to rusting. Then the cabinet is constructed of prepainted steel–the same high-quality finish found on refrigerators and dishwashers. Perhaps the most advanced feature of the Carrier WeatherMaker 8000 TwoSpeed is the state-of-the-art micro- processor control center which shows true leadership in furnace technology. The simplified electronics in this control provide high reliability while performing many of the functions of older, electro-mechanical devices in other furnaces. The control provides blower delay at start-up and shutdown, while monitoring furnace operations and functions. In the unlikely event of a service call, in less than a minute, the technician can use the component-test feature to determine if a major component has failed. The control will check itself; then the low and high inducer; silicon carbide ignition; low-, medium-, and high-speed blower. Another benefit of the control is the 3-amp fuse that protects the transformer and control. Our control is backed by a 3-year Limited Warranty.