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58TMADownflow/Horizontal 2-Speed,2-Stage Induced-Combustion Gas FurnaceInstallation, Start-Up, and Operating InstructionsSeries 100, Sizes 065-125NOTE: Read the entire instruction manual before starting theinstallation.Index PageSAFETY CONSIDERATIONS .....................................................1Clearances to Combustibles......................................................1ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONSPROCEDURE ...........................................................................2INTRODUCTION ..........................................................................2Dimensional Drawing ....................................................................3LOCATION....................................................................................3General ......................................................................................2Location Relative to Cooling Equipment ................................3Hazardous Locations.................................................................3AIR FOR COMBUSTION AND VENTILATION...................3-5Unconfined Space .....................................................................4Confined Space......................................................................4-5SUPPLY-AIR PLENUM INSTALLATION(DOWNFLOW) ........................................................................5Installation On a Concrete Slab ...............................................5Installation On a Combustible Floor ....................................5-6HORIZONTAL ATTIC INSTALLATION...................................6HORIZONTAL CRAWLSPACE INSTALLATION....................6FILTER ARRANGEMENT...........................................................6GAS PIPING...............................................................................6-7ELECTRICAL CONNECTIONS...............................................7-8115-v Wiring..........................................................................7-824-v Wiring...............................................................................8Accessories................................................................................8VENTING ......................................................................................8START-UP, ADJUSTMENT, AND SAFETY CHECK.........9-17General.................................................................................9-10Sequence of Operation ......................................................10-13Adaptive Heating Mode ....................................................10-12Non-Adaptive Heating Mode .................................................12Cooling Mode ....................................................................12-13Continuous Blower Mode.......................................................13Heat Pump Mode ....................................................................13Defrost Mode ..........................................................................13Start-Up Procedures...........................................................13-17Adjustments .......................................................................14-16Set Gas Input Rate ............................................................14-15Set Temperature Rise ........................................................15-16Set Thermostat Heat Anticipator ......................................16-17Check Safety Controls ............................................................17Checklist..................................................................................17SAFETY 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. 54-1992/ANSI Z223.1-1992.In Canada, refer to the current edition of the National Standard of® amaCANADIAN GAS ASSOCIATIONA P P R O V E DRTable 1— Clearances to CombustibleMaterials (In.)UNIT SIZE 065 AND 085 105 AND 125DOWNFLOW (IN ALCOVE OR CLOSET)Sides Single-Wall Vent 1* 0Type B-1 Double-Wall Vent 0 0Back 0 0Top 1 1Front†(See Notes)Single-Wall Vent 6 6Type B-1 Double-Wall Vent 3 3Vent Single-Wall Vent 6 6Type B-1 Double-Wall Vent 1 1HORIZONTAL POSITION (IN ALCOVE, ATTIC, ANDCRAWLSPACE)Sides‡ 1 1Back 0 0Top Single-Wall Vent 1 1Type B-1 Double-Wall Vent 1 1Front†(See Notes)Single-Wall Vent 6 6Type B-1 Double-Wall Vent 3 3Vent Single-Wall Vent 6 6Type B-1 Double-Wall Vent 1 1HORIZONTAL POSITION (IN CLOSET)Sides‡ ** 1 1Back 3 3Top Single-Wall Vent 2 2Type B-1 Double-Wall Vent 2 2Front(See Notes)Single-Wall Vent 6 6Type B-1 Double-Wall Vent 3 3Vent Single-Wall Vent 6 6Type B-1 Double-Wall Vent 1 1* For casing widths larger than 14-1/4 in., 0 clearance may be used.† 18 in. front clearance required for alcove.‡ Clearance shown is for the outlet end. The inlet end must maintain 6 in.clearance from flue to combustible materials when using single-wall vent.** Indicates supply or return sides when furnace is in the horizontal position.NOTES:1. Provide 30-in. front clearance for servicing. An open door in front of thefurnace can meet this requirement.2. A minimum clearance of 3 in. must be provided in front of the furnace forcombustion air and proper operation.Manufacturer 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. 535-824 Printed in U.S.A. Form 58TMA-3SI Pg 1 6/94 Replaces: 58TMA-2SI
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