Portions of the text and tables are reprinted from NFPA 54 /ANSI Z223.1−2012, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washing-
ton, 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.
Printed in U.S.A. 441 01 1402 06 9/15/2014
INSTALLATION INSTRUCTIONS
80% Single Stage, PSC Motor
Category I, Gas Furnace
N8MSN, N8MSL
These instructions must be read and understood completely before attempting installation.
Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and NOTE Signal Words in Manuals
The signal words DANGER, WARNING, CAUTION, and NOTE
are used to identify levels of hazard seriousness. The signal word
DANGER is only used on product labels to signify an immediate
hazard. The signal words WARNING, CAUTION, and NOTE will
be used on product labels and throughout this manual and other
manual that may apply to the product.
The signal word WARNING is used throughout this manual in the
following manner:
The signal word CAUTION is used throughout this manual in the
following manner:
!
WARNING
DANGER − Immediate hazards which will result in severe person-
al injury or death.
WARNING − Hazards or unsafe practices which could result in
severe personal injury or death.
CAUTION − Hazards or unsafe practices which may result in
minor personal injury or product or property damage.
NOTE − Used to highlight suggestions which will result in en-
hanced installation, reliability, or operation.
!
CAUTION
Signal Words on Product Labeling
Signal words are used in combination with colors and/or pictures
or product labels.
Safety−alert symbol
When you see this symbol on the unit and in instructions or manu-
als, be alert to the potential for personal injury.
TABLE OF CONTENTS
DIMENSIONS 3.......................................................
SAFETY CONSIDERATIONS 3..........................................
INTRODUCTION 4....................................................
CODES AND STANDARDS 5............................................
SAFETY 5............................................................
GENERAL INSTALLATION 5............................................
COMBUSTION AND VENTILATION AIR 5.................................
DUCT SYSTEMS 5....................................................
ACOUSTICAL LINING AND FIBROUS GLASS DUCT 5.....................
GAS PIPING AND GAS PIPE PRESSURE TESTING 5......................
ELECTRICAL CONNECTIONS 5.........................................
VENTING 5...........................................................
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS PROCEDURE 5.......
LOCATION 6.........................................................
AIR FOR COMBUSTION AND VENTILATION 7............................
INSTALLATION 10......................................................
UPFLOW INSTALLATION 10.............................................
DOWNFLOW INSTALLATION 11..........................................
FILTER ARRANGEMENT 12.............................................
AIR DUCTS 13.........................................................
AIR DELIVERY − CFM 14...............................................
ELECTRICAL CONNECTIONS 20.........................................
115−V WIRING 20......................................................
J−BOX RELOCATION 20................................................
ELECTRICAL CONNECTION TO J−BOX 20................................
ELECTRICAL DATA 21..................................................
24−V WIRING 22.......................................................
ACCESSORIES 23.....................................................
VENTING 23...........................................................
GENERAL VENTING REQUIREMENTS 23.................................
MASONRY CHIMNEY REQUIREMENTS 24................................
APPLIANCE APPLICATION REQUIREMENTS 26...........................
ADDITIONAL VENTING REQUIREMENTS 26...............................
SIDEWALL VENTING 27................................................
START−UP, ADJUSTMENT, AND SAFETY CHECK 30.......................
GENERAL 30..........................................................
START−UP PROCEDURES 30...........................................
ADJUSTMENTS 31.....................................................
SPEED SELECTION 32
.................................................
CHECK SAFETY CONTROLS 33.........................................
CHECKLIST 34........................................................
ORIFICE SIZE AND MANIFOLD PRESSURE 35............................
SERVICE AND MAINTENANCE PROCEDURES 39..........................
INTRODUCTION 39....................................................
CARE AND MAINTENANCE 39...........................................
SEQUENCE OF OPERATION 43.........................................
WIRING DIAGRAM FOR MODELS 44.....................................
TROUBLESHOOTING GUIDE 45.........................................
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 .
!
WARNING
PERSONAL INJURY, AND/OR PROPERTY
DAMAGE HAZARD
Failure to carefully read and follow this warning could
result in equipment malfunction, property damage,
personal injury and/or death.
Installation or repairs made by unqualified persons
could result in equipment malfunction, property
damage, personal injury and/or death.
The information contained in this manual is intended for
use by a qualified service technician familiar with safety
procedures and equipped with proper tools and test
instruments.
Installation must conform with local building codes and
with the Natural Fuel Gas Code (NFCG) NFPA
54/ANSI Z223.1, and National standards of Canada
CAN/CSA−B149.1 and .2 Natural Gas and Propane
Installation Codes.
INSTALLER: Affix these instructions on or adjacent to the furnace.
CONSUMER: Retain these instructions for future reference.
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