From inside (document excerpt):
58DXT Downflow 2-Speed, 2-Stage, Induced-Combustion Gas Furnace Installation, Start-Up, and Operating Instructions Size 060-100, Series 100 NOTE: Read the entire instruction manual before starting the installation. Index Page CANADIAN GAS ASSOCIATION SAFETY CONSIDERATIONS .1 Clearances to Combustibles 1 ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE .2 INTRODUCTION .2-3 Dimensional Drawing 2 LOCATION 3 General 3 Location Relative to Cooling Equipment 3 Hazardous Locations .3 AIR FOR COMBUSTION AND VENTILATION .3-5 Unconfined Space .4 Confined Space 4-5 SUPPLY-AIR PLENUM INSTALLATION (DOWNFLOW) 5 Installation On a Concrete Slab .5 Installation On a Combustible Floor 5 FILTER ARRANGEMENT .6 GAS PIPING 6 ELECTRICAL CONNECTIONS 7 115-v Wiring .7 24-v Wiring .7 Accessories 7 VENTING 7 START-UP, ADJUSTMENT, AND SAFETY CHECK .7-16 General .7-8 Sequence of Operation 8-13 Adaptive Heating Mode 8-11 Non-Adaptive Heating Mode .11 Cooling Mode 11-12 Continuous Blower Mode .12 Heat Pump Mode .12-13 Defrost Mode 13 Start-Up Procedures .13-17 Adjustments .13-16 Set Gas Input Rate 13-15 Set Temperature Rise 15-16 Set Thermostat Heat Anticipator 16 Check Safety Controls .16-17 Checklist 17 SAFETY CONSIDERATIONS Installing and servicing heating equipment can be hazardous due to gas and electrical components.
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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, on tags, and on labels attached to or shipped with the unit and other safety precautions that may apply. ® ama A PP R O VED R Table 1– Clearances to Combustible Materials (In.) Sides Back Top Front* (See Notes) Vent Single-Wall Vent Type B-1 Double-Wall Vent Single-Wall Vent Type B-1 Double-Wall Vent UNIT SIZE Single-Wall Vent Type B-1 Double-Wall Vent.