90+SingleStageN9MP1&N9MP2*9MPD *Denotes Brands (C, H, T)FAN ASSISTED,CategoryIVFurnaceo,. czw.z FURNACESee section 4 for Cateqory IV definition.SAFETY REQUIREMENTSThis furnace ca n be installed as a direct vent furnace using outside air for combustion or the furnace ca n use air from inside the structure for combustion.The INLET air pipe is optional. If combustion air comes from inside the structure, adequate make up air MUST be provided to compensate for oxygenburned. See the Indoor Combustion Airsection in the Combustion and Ventilation Aircha pter. If combustion air is drawn from outside the structure, itMUST be taken from the same atmospheric pressure zone as the vent pipe.Recognize safety information. This is the safety- alert symbolZ_. When you see this symbol on the furnace and in instructions manuals be alert to the3otential for personal injury.Jnderstand the signal words DANGER. WARNING. or CAUTION. These words are used with the safety-alert symbol. DANGERidentifies the mostserious hazards, those that will result in severe personal injury or death. WARNING signifies a hazard that could result in personal injury or death.CAUTION is used to identify unsafe practices that could result in minor personal injury or product and property damage.Installing and servicing heating equipment can be hazardous due to gas and electrical components. Only trained and qualified personnel should install,repair, or service heating equipment.Untrained service personnel can perform basic maintenance functions such as cleaning and replacing air filters. All other operations must be performedby trained service personnel When working on heating equipment, observe precautions in the literature, on tags, and on labels attached to or shippedwith the unit and other safety precautions that may apply.Follow all safety codes. In the United States, follow all safety codes including the current edition National Fuel Gas Code (NFGC) ANSIZ223.1 - 2002/N FPA No. 54- 2002. In Canada, refer to the current edition of the National Standard of Canada Natural Gas and Propane Installation Code(NSCNGPIC) CSA B149.1-00. Wear safetyglassesandworkgloves. Havefireextinguisher availableduringstart-upand adjustment procedures andservice calls.These instructions cover minimum requirements and conform to existing national standards and safety codes. In some instances, these instructionsexceed certain local codes and ordinances, especially those that may not have kept up with changing residential construction practices. We requirethese instructions as a minimum for a safe installation........la all_,,-_._ __,_'_":!,// .................International Comfort Products, LLCLewisburg, TN 37097 U.S.A.Table of ContentsINSTALLER: Affix these instructionson or adjacent to the furnace.CONSUMER: Retain theseinstructions for future reference.1. SafeInstallationRequirements................... 32. Installation .................................. 43. Combustion & Ventilation Air .................... 84.Vent & Combustion Air Piping ................... 125. Gas Supply and Piping ........................ 306. Electrical Wiring ............................. 347. Ductworkand Filter ........................ 368. Checksand Adjustments .................... 399. FurnaceMaintenance ....................... 4110.Sequenceof Operation& Diagnostics.......... 4211.ConcentricVentTermination ................. 46TechSupport and Parts........................ 51CARBON MONOXIDE POISONING AND FIREHAZARD.Failure to follow safety warnings exactly couldresult in serious injury, death, and/or propertydamage.This furnace is not designed for use in mobilehomes, trailers or recreational vehicles.PrintedinU.S.A. 10/19/2004 440 01 1020 (05)