Portions of the text and tables are reprinted from NFPA 54 /ANSI Z223.1−2009©, 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 2121 01 Sept. 2010
INSTALLATION INSTRUCTIONS
80% Two−Stage, Variable Speed
Category I, Gas Furnace
F8MVL & G8MVL
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
SAFETY CONSIDERATIONS 3........................................
INTRODUCTION 4..................................................
CODES AND STANDARDS 4.........................................
Safety 4..........................................................
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 5.......................................................
AIR FOR COMBUSTION AND VENTILATION 8..........................
INSTALLATION 10...................................................
Upflow Installation 10.............................................
Downflow Installation 11...........................................
Horizontal Installation 11...........................................
Filter Arrangement 13............................................
Air Ducts 13....................................................
Gas Piping 18...................................................
Electrical Connections 19.........................................
Venting 21......................................................
START−UP, ADJUSTMENT, AND SAFETY CHECK 32....................
General 32.......................................................
Start−Up Procedures 33............................................
Adjustments 33...................................................
Check Safety Controls 39...........................................
Checklist 40......................................................
SERVICE AND MAINTENANCE PROCEDURES 40....................
Introduction 40..................................................
Care and Maintenance 41.........................................
Sequence of Operation 47........................................
Wiring Diagram 50...............................................
Troubleshooting 51..............................................
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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