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From inside (document excerpt):
58UXT Upflow/Horizontal, 2-Speed, 2-Stage Induced-Combustion Gas Furnace Installation, Start-Up, and Operating Instructions Size 060-120, Series 100 NOTE: Read the entire instruction manual before starting the installation. Index Page SAFETY CONSIDERATIONS 1-2 Clearances to Combustibles 1 ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE 2-3 Dimensional Drawing 2 INTRODUCTION 3 LOCATION 3 General 3 Location Relative to Cooling Equipment 3 Hazardous Locations .4 AIR FOR COMBUSTION AND VENTILATION .4-5 Unconfined Space .4 Confined Space 4-5 UPFLOW INSTALLATION .5 HORIZONTAL ATTIC INSTALLATION .5 HOROZONTAL CRAWLSPACE INSTALLATION .5-6 FILTER ARRANGEMENT .6 LEVELING LEGS (IF REQUIRED) 6 GAS PIPING .6-7 ELECTRICAL CONNECTIONS .8-9 115-v Wiring 8-9 24-v Wiring .9 Accessories 9 VENTING 9 START-UP, ADJUSTMENT, AND SAFETY CHECK 9-18 General 9 Sequence of Operation 9-13 Adaptive Heating Mode 10-11 Non-Adaptive Heating Mode 11-12 Cooling Mode .12 Continuous Blower Mode .12 Heat Pump Mode .12-13 Defrost .13 Start-Up Procedures .13-14 Adjustments .14-17 Set Gas Input Rate 14-16 Set Temperature Rise 16-17 Set Thermostat Heat Anticipator 17-18 Check Safety Controls 18 Checklist 18 SAFETY CONSIDERATIONS Installation and servicing of 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 CANADIAN GAS ASSOCIATION ® ama A PP R O VED R Table 1–Minimum Clearances To Combustible Materials (In.) UNIT SIZE UPFLOW Furnace Sides Furnace Back Plenum Top Furnace Front (See Notes) Vent Single-Wall Vent Type B-1 Double-Wall Vent Single-Wall Vent Type B-1 Double-Wall Vent Single-Wall Vent Type B-1 Double-Wall Vent 1 HORIZONTAL POSITION (IN ALCOVE, ATTIC, AND CRAWLSPACE) Sides* Back Top Furnace Front (See Notes) Vent Single-Wall Vent Type B-1 Double-Wall Vent Single-Wall Vent Type B-1 Double-Wall Vent Single-Wall Vent Type B-1 Double-Wall Vent HORIZONTAL POSITION (IN CLOSET)** Sides* Back Top Furnace Front (See Notes) Vent Single-Wall Vent Type B-1 Double-Wall Vent Single-Wall Vent Type B-1 Double-Wall Vent Single-Wall Vent Type B-1 Double-Wall Vent Supply side must maintain 6 in. clearance from flue to combustible materials when using single-wall vent. 18 in. front clearance required for alcove. Indicates supply or return sides when furnace is in horizontal position. Line contact only permissible between lines formed by intersections of top and two sides of furnace jacket, building joists, studs, or framing. Clearance to return side is 0 in. ** J-Box must be installed on lower (bottom) inside of furnace. NOTES: 1. Provide 30-In. front clearance for servicing. An open door in front of furnace can meet this requirement.