From inside (document excerpt):
Product Data ® 58MCA 4-Way Multipoise Fixed-Capacity Condensing Gas Furnace Series 121 Input Capacities: 40,000 thru 120,000 Btuh High Efficiency and Flexibility Designed to Meet the Needs of New Homes The model 58MCA combines high efficiency with flexibility to meet the changing needs of new home construction. The unique 4-way, multipoise design of the 58MCA allows for installation in upflow, downflow, horizontal left, and horizontal right orientations, meaning it is perfect for a variety of installation applications.
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The 58MCA can be installed in a manufactured (mobile) home when the optional kit is used. The furnace is factory configured for upflow application but can easily be made ready for downflow or horizontal installation. Horizontal applications offer the advantage of reduced space requirements by locating the furnace in an attic or crawlspace, freeing space formerly dedicated to a furnace or utility room. The 58MCA is specifically designed to meet the needs of home builders and new home owners. Home builders benefit from the 58MCA’s unmatched flexibility and by building a reputation of using quality appliances in homes. Home owners benefit by energy savings from 1 of the most important home appliances. The components of the 58MCA represent the finest in the industry. Hot surface ignition (HSI) and an integrated control center provide reliable and efficient ignition. The inducer and inducer motor are unique in that efficient operation is achieved 1995 Carrier Corporation Form 58MCA-4PD in any type of installation. Standard 2-in. PVC pipe connects the combustion-air and vent pipes to the furnace. The primary and secondary heat exchangers are backed by a 25-year Limited Warranty. The 58MCA is a standard part of a quality-built new home. This highefficiency furnace will provide years of quality service to home builders and home owners alike. 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. 58MCA FEATURES/ BENEFITS Casing–One piece, seamless wraparound construction of heavy, galvanized steel resists corrosion. Certifications–The 58MCA units are A.G.A. and C.G.A. design certified for use with natural and propane gases. The efficiency is GAMA efficiency rating certified. The 58MCA meets California Air Quality Management District emission requirements. The 58MCA can be installed in a manufactured (mobile) home when the optional kit is used. Warranties–25-year Limited Warranty on the heat exchangers. One-year Warranty on integrated control center, HSI, and inducer motor. Contact your dealer for details. Combustion Products Venting–The combustion-air and vent pipes can terminate through a side wall or through the roof when used with a factoryauthorized vent termination kit. Blower Access Panel Switch–Shuts off all 115-v power through furnace components whenever blower access panel is opened. Hot Surface Ignitor–No pilot flame to waste gas or cause ignition problems. Slow Opening Redundant Gas Valve–The slow opening feature reduces start-up noise from rapid ignition. Insulation–Foil-faced insulation in heat exchanger section of the casing minimizes heat loss. Integrated Control Center– Controls sequencing and furnace operation. Equipped with a component test feature and status indicator light to assist in troubleshooting. Control times blower start after main burners ignite to eliminate cold air blowing into rooms. Adjustable Blower Speed–For precise airflow selection of heating or cooling operation. Direct Vent Sealed Combustion System–Model 58MCA uses 100% outdoor air, which results in especially quiet operation. Direct venting also minimizes the possibility of chloride contamination which can result in heat exchanger corrosion; also reduces air infiltration into the home increasing comfort. Monoport Burners.