58MSA4-Way Multipoise Fixed-CapacityCondensing Gas FurnaceService and Maintenance InstructionsFor Sizes 040—120, Series 110NOTE: Read the entire instruction manual before performing anyservice or maintenance.This symbol → indicates a change since the last issue.Index PageSAFETY CONSIDERATIONS..................................................1-2ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........2GENERAL......................................................................................2CARE AND MAINTENANCE................................................2-10Cleaning and/or Replacing Air Filter.......................................3Blower Motor and Wheel Maintenance................................3-4Cleaning Burners ...................................................................4-5Cleaning Heat Exchangers ....................................................5-6Primary Heat Exchangers ................................................5-6Secondary Heat Exchangers................................................6Flushing Collector Box and Drainage System .....................6-7Servicing Hot Surface Ignitor ...............................................7-8Electrical Controls and Wiring.................................................8Troubleshooting ...................................................................8-10Checking Heat Tape Operation (If Applicable) .................9-10Winterizing..............................................................................10WIRING DIAGRAM...................................................................12SERVICE LABEL .......................................................................13TROUBLESHOOTING GUIDE ............................................14-15SAFETY CONSIDERATIONSInstalling and servicing heating equipment can be hazardous due togas and electrical components. Only trained and qualified person-nel should install, repair, or service heating equipment.Untrained personnel can perform basic maintenance functionssuch as cleaning and replacing air filters. All other operations mustbe performed by trained service personnel. When working onheating equipment, observe precautions in the literature, on tags,and on labels attached to or shipped with the unit and other safetyprecautions that may apply.Follow all safety codes. In the United States, follow all safetycodes including the National Fuel Gas Code (NFGC) NFPA54-1996/ANSI Z223.1-1996 and the Installation Standards, WarmAir Heating and Air Conditioning Systems (NFPA 90B)ANSI/NFPA 90B. In Canada, refer to the CAN/CGA-B149.1- and.2-M95 National Standard of Canada, Natural Gas and PropaneInstallation Codes (NSCNGPIC). Wear safety glasses and workgloves. Have a fire extinguisher available during start-up andadjustment procedures and service calls.Recognize safety information. This is the safety-alert symbol .When you see this symbol on the unit and in instructions ormanuals, be alert to the potential for personal injury.Understand the signal words DANGER, WARNING, and CAU-TION. These words are used with the safety-alert symbol. DAN-GER identifies the most serious hazards which will result in severepersonal injury or death. WARNING signifies hazards whichcould result in personal injury or death. CAUTION is used toidentify unsafe practices which would result in minor personalinjury or product and property damage. NOTE is used to highlightsuggestions which will result in enhanced installation, reliability,or operation.A93040®amaCANADIAN GAS ASSOCIATIONA P P R O V E DRAs an ENERGY STAR®Partner, Carrier Corporationhas determined that this prod-uct meets the ENERGYSTAR® guidelines for energyefficiency. A98306REGISTERED QUALITY SYSTEM→ Fig. 1—Multipoise Furnace in Upflow Orienta-tionVisit www.carrier.comManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Book 1 4Tab 6a 8a PC 101 Catalog No. 535-744 Printed in U.S.A. Form 58MSA-3SM Pg 1 5-99 Replaces: 58MSA-2SM