58TMADownflow/Horizontal 2-Speed, 2-Stage,Induced-Combustion Gas FurnaceInstallation, Start-Up, and Operating InstructionsSizes 065-125, Series 111NOTE: Read the entire instruction manual before starting theinstallation.This symbol → indicates a change since the last issue.Index PageSAFETY CONSIDERATIONS .....................................................1ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONSPROCEDURE ...........................................................................2INTRODUCTION.......................................................................2-4Dimensional Drawing ....................................................................2Clearances to Combustibles......................................................3LOCATION....................................................................................4General ......................................................................................4Location Relative to Cooling Equipment ................................4Hazardous Locations.................................................................4AIR FOR COMBUSTION AND VENTILATION...................4-5Unconfined Space .....................................................................4Confined Space......................................................................4-5SUPPLY-AIR PLENUM INSTALLATION(DOWNFLOW) .....................................................................5-6Installation On Combustible Floor...........................................6HORIZONTAL ATTIC INSTALLATION...................................7HORIZONTAL CRAWLSPACE INSTALLATION....................7FILTER ARRANGEMENT...........................................................7GAS PIPING...............................................................................7-9ELECTRICAL CONNECTIONS ................................................10115-v Wiring...........................................................................1024-v Wiring.............................................................................10Accessories..............................................................................10VENTING ....................................................................................10START-UP, ADJUSTMENT, AND SAFETY CHECK.......10-22General...............................................................................10-12Sequence of Operation ......................................................12-16Adaptive Heating Mode ....................................................12-14Non-Adaptive Heating Mode .................................................14Cooling Mode ....................................................................14-15Continuous Blower Mode.......................................................15Heat Pump Mode ....................................................................15Defrost Mode.....................................................................15-16Start-Up Procedures ................................................................16Adjustments .......................................................................16-22Set Gas Input Rate ............................................................16-22Set Temperature Rise ........................................................17-21Set Thermostat Heat Anticipator ......................................21-22Check Safety Controls ............................................................22Checklist..................................................................................23SAFETY 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, refer to the NationalFuel Gas Code (NFGC) NFPA No. 54-1996/ANSI Z223.1-1996.In Canada, refer to the current edition of the National Standard ofCanada CAN/CGA-B149.1- and .2-M95 Natural Gas and PropaneInstallation Codes (NSCNGPIC). Wear safety glasses and workgloves. Have 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.These instructions cover minimum requirements and conform toexisting national standards and safety codes. In some instances,these instructions exceed certain local codes and ordinances,especially those that may not have kept up with changing residen-tial construction practices. We require these instructions as aminimum for a safe installation.®ama CANADIAN GAS ASSOCIATIONA P P R O V E DRCERTIFICATION OFMANUFACTURING SITEVisit 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. 535-887 Printed in U.S.A. Form 58TMA-6SI Pg 1 8-97 Replaces: 58TMA-4SI