Printed in U.S.A. 441 01 2613 06 July 2010INSTALLATION INSTRUCTIONS80% Single Stage, Category I, Gas FurnaceN8MPN, N8MPL, C8MPN, H8MPN, T8MPN,C8MPL, H8MPL, T8MPL(Upflow/Downflow/Horizontal)These instructions must be read and understood completely before attempting installation.Safety Labeling and Signal WordsDANGER, WARNING, CAUTION, and NOTEThe signal words DANGER, WARNING, CAUTION,and NOTE are used to identify levels of hazardseriousness. The signal word DANGER is only usedon product labels to signify an immediate hazard.The signal words WARNING, CAUTION, and NOTEwill be used on product labels and throughout thismanual and other manual that may apply to theproduct.DANGER − Immediate hazards which will result insevere personal injury or death.WARNING − Hazards or unsafe practices whichcould result in severe personal injury or death.CAUTION − Hazards or unsafe practices which mayresult in minor personal injury or product or propertydamage.NOTE − Used to highlight suggestions which willresult in enhanced installation, reliability, oroperation.! WARNINGSignal Words in ManualsThe signal word CAUTION is used throughoutthis manual in the following manner:! CAUTIONSignal Words on Product LabelingSignal words are used in combination withcolors and/or pictures or product labels.The signal word WARNING is used throughoutthis manual in the following manner:Safety−alert symbolWhen you see this symbol on the unit and ininstructions or manuals, be alert to thepotential for personal injury.TABLE OF CONTENTSSAFETY CONSIDERATIONS 2. . . . . . . . . . . . . . . . . . .Safe Installation Requirements 4. . . . . . . . . . . . . . . . . .INSTALLATION 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Side Venting 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Combustion & Ventilation Air 10. . . . . . . . . . . . . . . . . . . .Gas Vent Installation 13. . . . . . . . . . . . . . . . . . . . . . . . . . .Venting (Horizontal) 14. . . . . . . . . . . . . . . . . . . . . . . . . . .Masonry Chimney Venting (Chimney Adapter) 16. . . .Gas Supply and Piping 19. . . . . . . . . . . . . . . . . . . . . . . . .Electrical Wiring 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Ductwork and Filter 23. . . . . . . . . . . . . . . . . . . . . . . . . . . .Checks and Adjustments 28. . . . . . . . . . . . . . . . . . . . . . .Furnace Maintenance 33. . . . . . . . . . . . . . . . . . . . . . . . . .Sequence of Operation & Diagnostics 34. . . . . . . . . . . .Technical Support Manual 36. . . . . . . . . . . . . . . . . . . . . .Wiring Diagram 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .International Comfort Products, LLCLewisburg, TN 37091 U.S.A.! WARNINGPERSONAL INJURY, AND/OR PROPERTYDAMAGE HAZARDFailure to carefully read and follow this warning couldresult in equipment malfunction, property damage,personal injury and/or death.Installation or repairs made by unqualified personscould result in equipment malfunction, propertydamage, personal injury and/or death.The information contained in this manual is intended foruse by a qualified service technician familiar with safetyprocedures and equipped with proper tools and testinstruments.Installation must conform with local building codes andwith the Natural Fuel Gas Code (NFCG) NFPA 54/ANSIZ223.1, and National standards of CanadaCAN/CSA−B149.1 and .2 Natural Gas and PropaneInstallation Codes.INSTALLER: Affix these instructions on or adjacent to thefurnace.CONSUMER: Retain these instructions for future refer-ence.Portions of the text and tables are reprinted from NFPA 54 /ANSI Z223.1−2009©, with permission of National 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 entirety.