From inside (document excerpt):
Product Data 58TUA WeatherMaker® 8000TS with Comfort Heat TechnologyTM Deluxe Upflow Furnace Series 120 and 130 Input Capacities: 40,000 thru 135,000 Btuh Comfort Heating for Energy-Efficient Gas Furnaces Carrier leads the industry with our new WeatherMaker® 8000TS Induced-Draft Gas Furnace. This furnace can operate at 2 different speed settings which provide outstanding home comfort. The WeatherMaker 8000TS furnace with Comfort Heat TechnologyTM is built with the most advanced manufacturing equipment, processes, and technology available in order to ensure top quality.
Packed into the cabinet are the industry’s foremost dealer and homeowner features. The 58TUA Upflow Furnace is a great asset to Carrier’s list of product leadership in the gas furnace industry. These Comfort Heat Technology 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 percent. The Carrier WeatherMaker 8000TS utilizes a hot surface, silicon carbide ignition system to save energy and increase reliability. Our design uses the patented S-shaped 4-pass heat exchanger, a soft mount 2-speed inducer assembly, and a 2-stage slow-opening gas valve to minimize sound level. The Super-S heat exchanger provides better heat transfer while enabling us to make a compact furnace. This provides more room in 2000 Carrier Corporation Form 58TUA-11PD 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 8000TS Gas Furnace will meet your home heating requirements. This furnace family provides the widest range of heating capacities available. The superior attention to cabinet detail is obvious. The Carrier WeatherMaker 8000TS features 1-piece, seamless, wrap-around construction. There are no spot welds on the exterior surfaces of the WeatherMaker 8000TS 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 WeatherMaker 8000TS is the state-of-the-art microprocessor 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, electromechanical devices in other furnaces. Advanced features of the control show Carrier’s true leadership in furnace technology. 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 self-test feature to determine if a major component has failed. The control will check itself, then the low and high inducers, silicon carbide ignition, and low-, medium-, and high-speed blower. The control also features a 3-amp fuse that protects the transformer and control. Our induced-combustion furnace has a patented draft safeguard switch. The draft safeguard switch will stop furnace operation if the vent system becomes blocked or is not operating properly.