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From inside (document excerpt):
Product Data HEATING & COOLING 58MXA Deluxe 4-Way Multipoise Fixed-Capacity Condensing Gas Furnace Series 111 Input Capacities: 40,000 thru 120,000 Btuh 4-way Multipoise Design Allows More Applications. The model 58MXA is a must for your product line. This high-efficiency furnace allows more applications with its reliable 4-way multipoise design. The model 58MXA is available in 10 heat/airflow combinations and with the 4-way multipoise design can be installed in upflow, downflow, or horizontal positions covering up to 40 different applications.
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The furnace is factory configured for upflow application. This versatile unit utilizes hot surface ignition (HSI) which ignites the burners directly. HSI eliminates gas waste that typical continuous-pilot designs can bring. Hot surface ignition provides reliable start-up and operation. Take a look at the control center on the model 58MXA. Control of the ignition, inducer, and blower operation is all handled in 1 central printed circuit board. The status indicator on the control signals when a fault has occurred and identifies where the problem is. This, along with the component test feature, makes the 58MXA one of the easiest gas furnaces to troubleshoot. High efficiency is achieved by maximizing heat transfer. The model 58MXA uses 100% outdoor air for combustion in a sealed combustion system. The result is energy-saving efficiency, 92% Annual Fuel Utilization Efficiency (AFUE), and reduced operational noise. The model 58MXA is 1 of the quietest furnaces in the industry. A unique feature of this unit is the patented polypropylene-laminated heat exchanger. This secondary heat exchanger ensures that all available heat is properly transferred to the airstream 1994 Carrier Corporation Form 58MXA-2PD This document was created with FrameMaker 4.0.4 and throughout the home. Using the exclusive flow-through design, the secondary heat exchanger reduces the pressure drop in the furnace which leads to lower electrical usage, an important part of this unit’s efficiency. Carrier heat exchangers are backed by a Lifetime Limited Warranty.* When we put it all together, the model 58MXA combines quality and design to bring high efficiency and comfort. You will enjoy the versatility and ease of installation of this unit. The model 58MXA is equipped for either left- or right-side connections. Blower speeds are easily adjustable with speed-taps easily located on the control center. An updated, more efficient inducer allows for more use of 2-in. vent and combustion-air piping, keeping installation costs low. As with other Carrier furnaces, this model is designed to work as a part of the total home comfort system which includes elements for cooling, air cleaning, humidification, ventilation, and zoning. 58MXA FEATURES/ BENEFITS.