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From inside (document excerpt):
58STA/STX Single Stage Deluxe Induced Combustion 4 Way Multipoise Furnace Installation, Start up, Operating and Service and Maintenance Instructions Series 120/C SAFETY CONSIDERATIONS 2 INTRODUCTION 3 CODES AND STANDARDS 4 Safety . 4 General Installation . 5 Combustion and Ventilation Air . 5 Duct Systems . 5 Acoustical Lining and Fibrous Glass Duct . 5 Gas Piping and Gas Pipe Pressure Testing . 5 Electrical Connections 5 Venting 5 LOCATION .
6 AIR FOR COMBUSTION AND VENTILATION . 8 INSTALLATION 11 Bottom Return Air Inlet 11 Side Return Air Inlet . 11 Leveling Legs (If Desired) 11 Bottom Return Air Inlet 12 Suspended Furnace Support . 12 Platform Furnace Support . 13 Roll-Out Protection . 13 Bottom Return Air Inlet 13 Side Return Air Inlet . 13 General Requirements 14 Ductwork Acoustical Treatment 14 Supply Air Connections 14 Return Air Connections 20 START-UP, ADJUSTMENT, AND SAFETY CHECK . 32 General . 32 Start-Up Procedures . 32 Adjustments . 35 Check Safety Controls . 39 Checklist 39 SERVICE AND MAINTENANCE PROCEDURES . 46 Introduction . 47 1 NOTE: Read the entire instruction manual before starting the installation. Portions of the text and tables are reprinted from NFPA 54/ANSI Z223.1-2006E, with permission of Nation Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washington DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSI on the referenced subject, which is represented only by the standard in its entirely. REGISTERED Care and Maintenance . 47 Sequence of Operation . 50 Wiring Diagrams . 50 Troubleshooting 50 ama ISO 9001:2000 CERTIFIED SAFETY CONSIDERATIONS Improper installation, adjustment, alteration, service, maintenance, or use can cause explosion, fire, electrical shock, or other conditions which may cause death, personal injury, or property damage. Consult a qualified installer, service agency, or your distributor or branch for information or assistance. The qualified installer or agency must use factory-authorized kits or accessories when modifying this product. Refer to the individual instructions packaged with the kits or accessories when installing. Follow all safety codes. Wear safety glasses, protective clothing, and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly and follow all warnings or cautions included in literature and attached to the unit. Consult local building codes and National Electrical Code (NEC) for special requirements. Recognize safety information. This is the safety-alert symbol !. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these signal words; DANGER, WARNING, and CAUTION.