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From inside (document excerpt):
58UHV, 58UXV 2-Stage, Variable-Speed Gas Furnaces Visit www.carrier.com Service and Maintenance Instructions For Sizes 060-120, Series 110 NOTE: Read the entire instruction manual before performing any service or maintenance. This symbol indicates a change since the last issue. These procedures are for size 60,000 through 120,000 Btuh units. Index Page SAFETY CONSIDERATIONS .1 ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE .2 CARE AND MAINTENANCE 2-5 Air Filter Arrangement 2-3 Blower Motor and Wheel 3-4 Cleaning Heat Exchanger 4-5 Electrical Controls and Wiring .5 Troubleshooting 5 Application Wiring Diagrams 6 Unit Wiring Diagram 7 Service Label 8 Troubleshooting Guide .9 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, tags, and labels attached to or shipped with the unit and other safety precautions that may apply. Follow all safety codes. In the United States, follow all safety codes including the National Fuel Gas Code NFPA No. 541996/ANSI Z223.1-1996. In Canada, refer to the current edition of the National Standard of Canada CAN/CGA-B149.1- and .2-M95 Natural Gas and Propane Gas Installation Codes. Wear safety glasses and work gloves. Have fire extinguisher available during start-up and adjustment procedures and service calls. Recognize safety information. This is the safety-alert symbol. When you see this symbol on the furnace and in instructions or manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, and 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 signifies a hazard which 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. A95137 Fig. 1–Model 58UHV or 58UXV Horizontal ® ama CANADIAN GAS ASSOCIATION A PP R O VED R A94085 CERTIFICATION OF MANUFACTURING SITE Fig. 2–Model 58UHV or 58UXV Upflow Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Book 1 4 PC 101 Catalog No. 535-835 Printed in U.S.A. Form 58D,U-5SM Pg 1 10-97 Replaces: 58D,U-3SM Tab 6a 8a The ability to properly perform maintenance on this equipment requires certain expertise, mechanical skills, tools, and equipment. If you do not possess these items, do not attempt to perform any maintenance on this equipment other than those procedures recommended in the User’s Manual.