1
986TB
TWO−STAGE, VARIABLE−SPEED MULTIPOISE
CONDENSING GAS FURNACE
SERIES A
Installation, Start−up, Operating and
Service and Maintenance Instructions
NOTE: Read the entire instruction manual before starting the installation.
SECTION
SAFETY CONSIDERATIONS 3.........................
INTRODUCTION 4...................................
CODES AND STANDARDS 4...........................
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS 4...
ACCESSORIES 5.....................................
LOCATION 5........................................
AIR FOR COMBUSTION AND VENTILATION 9..........
CONDENSATE TRAP 12...............................
CONDENSATE DRAIN 17.............................
INSTALLATION 21...................................
AIR DUCTS 31.......................................
GAS PIPING 35......................................
ELECTRICAL CONNECTIONS 36.......................
VENTING 43........................................
START−UP, ADJUSTMENT, AND SAFETY CHECK 68......
SERVICE AND MAINTENANCE PROCEDURES 79........
SEQUENCE OF OPERATION 86........................
PARTS REPLACEMENT GUIDE 94......................
CERTIFIED
Use of the AHRI Certified
TM
Mark indicates a
manufacturer’s participation in the program. For
verification of certification for individual products,
go to www.ahridirectory.org.
Portions of the text and tables are reprinted from the current edition
of NFPA 54/ANSI Z223.1, 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.
TABLE
Loose Parts Bag Contents 6..............................
Minimum Clearances to Combustible Materials 6.............
Minimum Free Area Required 11.........................
Minimum Space Volumes 11.............................
Filter Size Information 25...............................
Opening Dimensions 27................................
Air Delivery CFM 32...................................
Maximum Capacity of Pipe 36...........................
Electrical Data 39......................................
Vent Termination Kit for Direct Vent (2−Pipe) Systems 45......
Combustion−Air Vent Pipe, Fitting & Cement Material.. 51.....
Maximum Allowable Exposed Vent Lengths Insulation 52......
Maximum Equivalent Vent Length 52......................
Deductions from Maximum Equivalent Vent Length 54........
Altitude Derate Multiplier for U.S.A. 77....................
Blower Off Delay Setup Switch 77........................
Gas Rate 77..........................................
Orifice Size and Manifold Pressure 78.....................
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