ICP N8MSN1102122A1, G8MXN1352420A1, G8MXN1102120A1, G8MXN0902116A1, G8MXN0701716A1 Owner’s Manual
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HOME OWNER’S INFORMATION
Induced Combustion Gas Furnace
NOTE TO INSTALLER:
This manual must be left with the equipment user.
USER: Please read all instructions in the manual and
retain all manuals for future reference.
Our products are designed, tested and built in
accordance with Department of Energy (DOE)
standardized procedures; however, actual operating
results and efficiencies may vary based on manufacturing
and supplier tolerances, equipment configuration,
operating conditions and installation practices.
!
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
serious injury, death, or property damage.
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
−Do not try to light any appliance.
−Do not touch any electrical switch; do not use any
phone in your building.
−Leave the building immediately.
−Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
−If you cannot reach your gas supplier, call the fire
department.
Installation and service must be performed by a qualified
installer, service agency or the gas supplier.
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury and/or death.
Carbon Monoxide is invisible, odorless, and toxic! Install
a carbon monoxide alarm in your home, even if you do
not own a gas appliance. Locate the carbon monoxide
alarm in the living area of your home and away from gas
appliances and doorways to attached garages. Follow
the alarm manufacturer’s instruction included with the
alarm.
WARNING
WARNING
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 .
Illustrations and photographs are only representative. Some product models may vary.
!
ELECTRICAL OPERATION HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
Do not use this furnace if any part has been under
water. A flood−damaged furnace is extremely
dangerous. Attempts to use the furnace can result in fire
or explosion. A qualified service agency should be
contacted to inspect the furnace and to replace all gas
controls, control system parts, electrical parts that have
been wet or the furnace if deemed necessary.
WARNING
Specifications subject to change without notice.
441 02 2401 04 5/15/18
TABLE OF CONTENTS
FURNACE COMPONENTS 2............................
GENERAL FURNACE SAFETY 2........................
IMPORTANT FACTS 3..................................
SAFETY CONSIDERATIONS 3..........................
BEFORE STARTING YOUR FURNACE 3.................
STARTING YOUR FURNACE 3..........................
Steps for Starting Your Furnace 4.......................
SHUTTING DOWN YOUR FURNACE 5...................
PERFORMING ROUTINE MAINTENANCE 5..............
Filtering Out Trouble 6.................................
COMBUSTION AREA AND VENT SYSTEM 7..............
BEFORE YOU REQUEST A SERVICE CALL 8............
REGULAR DEALER MAINTENANCE 9...................
INSTALLATION DATA 9................................
GENERAL FURNACE SAFETY
FIRE OR EXPLOSION HAZARD WARNING 1.............
CARBON MONOXIDE WARNING 1......................
FLOOD DAMAGE WARNING 1..........................
COMBUSTIBLE MATERIALS, GASOLINE WARNING 3.....
FURNACE MUST BE KEPT FREE AND CLEAR OF
INSULATING MATERIAL WARNING 3....................
PROPER FURNACE SHUTDOWN PROCEDURES 5.......
SERVICE AND MAINTENANCE ELECTRICAL HAZARD
WARNING 5..........................................
SHARP EDGES CAUTION 6............................
NO FILTER CAUTION 6................................
FILTER ROD MODIFICATION CAUTION 7................
IMPROPER VENT WARNING 7..........................
DIRT, RUST, OR ACCUMULATION CAUTION 7...........
FURNACE NEEDS AIR FOR COMBUSTION AND
VENTILATION WARNING 7............................
DRAFT SAFEGUARD SWITCH CAUTION 8..............
Figure 1 − 80% AFUE Single Stage Furnace Components
INDUCER MOTOR
ASSEMBLY
PRESSURE
SWITCH
FLUE COLLECTOR
BOX
GAS VALVE
MANUAL RESET
LIMIT SWITCHES
HOT SURFACE
IGNITOR
BLOWER
DOOR SAFETY
SWITCH
FURNACE
CONTROL
BOARD
RATING PLATE NOT SHOWN
(LOCATED ON BLOWER DOOR)
VENT
ELBOW
MAIN LIMIT SWITCH
(BEHIND GAS VALVE)
BLOCKED VENT
SWITCH
FLAME
SENSOR
GAS MANIFOLD
GAS BURNER
BLOWER AND
MOTOR
CAPACITOR/
POWER CHOKE
Figure 2 − 80% AFUE Two−Stage Furnace Components
INDUCER MOTOR
ASSEMBLY
PRESSURE
SWITCHES
FLUE COLLECTOR
BOX
GAS VALVE
VENT
ELBOW
MAIN LIMIT SWITCH
(BEHIND GAS VALVE)
BLOCKED VENT
SWITCH
FLAME
SENSOR
FURNACE COMPONENTS
(Furnace shown in upflow position; may be used in downflow
or horizontal orientation or applications. Vent Elbow may be
turned to a different position, depending on type of
installation)
MANUAL RESET
LIMIT SWITCHES
HOT SURFACE
IGNITOR
BLOWER DOOR
SAFETY SWITCH
FURNACE CONTROL
BOARD
RATING PLATE NOT SHOWN
(LOCATED ON BLOWER DOOR)
GAS MANIFOLD
GAS BURNER
BLOWER AND
MOTOR
CAPACITOR/
POWER CHOKE
2
Specifications subject to change without notice.
441 02 2401 04
IMPORTANT FACTS (DO’S AND DON’TS)
S DO: READ AND UNDERSTAND THIS MANUAL.
S DO: Have your furnace and vent system inspected annually
by a qualified service technician.
S DO: Inspect your filter monthly and clean or replace when
needed.
S DO: Provide adequate airflow to the furnace for efficient
combustion and safe ventilation.
S DO: Keep your furnace free and clear of insulating material.
Some materials may be combustible. Examine the furnace
area when the furnace is installed or when insulation is
added.
S DO NOT: Enclose your furnace in an airtight room or seal it
behind solid doors.
S DO NOT: Keep combustible materials, gasoline, and other
flammable liquids or vapors around your furnace.
S DO NOT: Cover your furnace in any manner.
S DO NOT: Store anything (including trash or debris) near your
furnace.
S DO NOT: In any way block or restrict airflow around your
furnace.
S DO NOT: In any way block or restrict airflow to your supply air
and return air grills.
S DO NOT: Use your furnace room as a broom closet or a place
to store any kind of chemical or cleaner.
S DO NOT: Contaminate the air used for combustion of your
furnace with any kind of chemical or fumes. This could also
cause heat exchangers, metal vent systems or components
to deteriorate.
NOTE: These chemicals or fumes are present in many
products around the home, such as: water softener salts, any
type of household cleaning product, any type of laundry
product, adhesives, paints, varnishes, paint strippers, waxes
and plastics, etc.
During remodeling be sure the combustion air is fresh and
uncontaminated. If these compounds are burned in your
furnace, the heat exchangers and metal vent system may
deteriorate.
NOTE: The qualified installer or agency must use only
factory−authorized replacement parts, kits, and accessories
when modifying this product.
This furnace contains safety devices which must be manually
reset. If the furnace is left unattended for an extended period
of time, have it checked periodically for proper operation. This
precaution will prevent problems associated with no heat,
such as frozen water pipes, etc. See “Before You Request a
Service Call” section in this manual.
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in injury, death,
or property damage.
Do not keep combustible materials, gasoline, and other
flammable liquids or vapors around your furnace.
WARNING
SAFETY CONSIDERATIONS
Installing and servicing heating equipment can be hazardous
due to gas and electrical components. Only trained and
qualified personnel should install, repair, or service heating
equipment.
Untrained personnel can perform basic maintenance
functions such as cleaning or replacing air filters. All other
operations must be performed by trained service personnel.
Observe safety precautions in this manual, on tags, and on
labels attached to the furnace, and other safety precautions
that may apply.
Recognize safety information. This is the safety−alert symbol
. When you see this symbol on the furnace and in
instructions or manuals, be alert to the potential for personal
injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety−alert
symbol. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING
signifies hazards which could result in personal injury or
death. CAUTION is used to identify unsafe practices which
would result in minor personal injury or product and property
damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability or operation.
BEFORE STARTING YOUR FURNACE
Examine the furnace installation to determine that:
1. All flue gas carrying areas external to the furnace (i.e.
chimney, vent connector) are clear and free of
obstructions.
2. The vent connector is in place, slopes upward and is
physically sound without holes or excessive corrosion.
3. The return−air duct connection(s) is physically sound, is
sealed to the furnace casing, and terminates outside the
space containing the furnace.
4. The physical support of the furnace is sound without
sagging cracks, gaps, etc. around the base.
5. There are no obvious signs of deterioration of the
furnace.
STARTING YOUR FURNACE
Your furnace uses an automatic, hot surface ignition system
to light the burners each time the thermostat signals the
furnace to start.
Follow these important safeguards:
S Never attempt to manually light the burners with a
match or other source of flame.
Figure 3 − Do Not Light Burner with Match
!
FIRE OR EXPLOSION HAZARD
Failure to follow warnings could result in personal
injury, death, or property damage.
Keep insulation clear of furnace and maintain
clearances shown on unit clearance label.
441 02 2401 04
WARNING
Specifications subject to change without notice.
A92319
S Read and follow the operating instructions on inside
of main furnace door, especially the item that reads
as follows:
“Wait 5 minutes to clear out any gas. Then smell for
gas, including near the floor. If you smell gas, STOP!
Follow “B” in the safety information above on this
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