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Further reference is made to the current edition of the National Fuel Gas Code NFPA 54-1988-1/ANSI Z223.1-1988. ► Reference should also be made to the regulations of the serving gas supplier and the local building, heating, plumbing, or other codes in effect in the area in which the installation is made. —» SAFETY CONSIDERATIONS Installation and servicing of heating equipment can be hazardous due to gas and electrical components. Only trained and qualified personnel should install, repair, or service heating equipment. Untrained personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be performed by trained service personnel. When working on heating equipment, observe precautions in the literature, tags, and labels attached to or shipped with the unit and other safety precautions that may apply. Follow all safety codes, including NFPA No. 54/ANSI Z223.1-1988, National Fuel Gas Code, Wear safety glasses and work gloves. Have fire extinguisher available during startup and adjustment procedures and service call. Recognize safety information. This is the safety-alert symbol A. When you see this symbol on the furnace and in instructions or manuals, be alert to the potential for personal injury. Understand the signal word—DANGER, WARNING or CAUTION. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING, on the other hand could result in personal injury or death. CAUTION is used to identify unsafe practices, which would result in minor personal injury or product and property damage. Each Model 58DX is shipped from the factory completely assembled with a multispeed direct-drive blower and wired ready for an indoor heating installation. The furnace features a blower control center with easy-to-read, 24-volt terminal strip to ensure proper connections. The output capacity and any representations of efficiency for this furnace are based on standard Department of Energy test procedures. The installed operation may vary, depending on installation, weather, and other factors. The design of the downflow gas-fired furnace is A.G.A. certified for installation on noncombustible flooring. The furnace may be installed on combustible flooring when installed with the accessory downflow subbase. This furnace is designed for installation in alcoves, attics, basements, closets, utility rooms, and manufactured housing (mobile homes). This furnace line is not A.G.A. certified for installation in a recreation vehicle or outdoors. ■ EFFICIENCY I RATING | CERTIFIED lama &f! A87414 Fig. 1 —Model 58DX A WARNING Improper installation, adjustment, alteration, service, maintenance, or use can cause carbon monoxide poisoning, explosion, fire, electrical shock, or other conditions which may cause personal injury or property damage. Consult a qualified installer, service agency, local gas supplier or your Distributor or Branch for information or assistance. The qualified installer or agency must use only factory authorized kits or accessories when modifying this product. A failure to adhere to this warning can cause electrical shock, fire, personal injury, or death. Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Bookl 1 I 4 PC 101 Catalog No. 535-887 Printed in U.S.A. Form 58DX-13SI Pg 1 6-89 Replaces: 58DX-11 SI Tab I6al8a HOLE IN FLOOR 3 A73382 Fig. 2—Floor Opening for Concrete Slab Fig. 4—Furnace, Plenum, and Base Installed on a Combustible Floor Installation requires the following: *1. Inspection *11. Furnace Location *111. Gas Piping *IV. Combustion-Air and Vent Piping *V. Condensate Piping VI. Supply-Air Plenum Installation VII. Electrical VIII. Sequence of Operation IX. Filter *X. Startup and Adjustment XI. Care and Maintenance *For these sections (or installation steps), refer to the appropriate sections of “Procedures for Downflow Condensing Furnaces” booklet packaged with this unit. For accessory installation details, refer to the applicable installation literature. NOTE: Remove all shipping brackets and materials before operating the furnace. VI. SUPPLY-AIR PLENUM INSTALLATION A. Installation on a concrete slab 1. See Fig. 5 for dimensions and location of supply-air opening in furnace bottom. 2. Construct hole in floor per dimensions in Fig. 2 and Table 1. 3. Place plenum and furnace as shown in Fig. 3. Table 1—Opening Dimensions Furnace A B Width Furnace Furnace & Coil* 171/2 16 1/8 19 5/8 19 7/16 21 19 5/8 19 5/8 19 7/16 241/2 231/8 19 5/8 19 7/16 *These dimensions apply when a Model 28RC or 28RD Evaporator Coil casing is to be installed. B. Installation on a combustible floor 1. Read Installation Instructions packaged with downflow subbase. 2. Cut and frame hole in floor per dimensions in Installation Instructions pack...