Carrier OM9GFC-03 User manual

Condensing Gas Furnace
Owner’s Manual
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.
FIRE OR EXPLOSION HAZARD
Failure to follow warnings could result in personal
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 nearby
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.
!WARNING
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
A11263
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, and electrical
parts that have been wet, or the entire furnace if deemed
necessary.
!WARNING

2
TABLE OF CONTENTS
WELCOME TO A NEW GENERATION OF COMFORT 2....
FURNACE COMPONENTS 3...........................
SAFETY CONSIDERATIONS 4.........................
BEFORE STARTING YOUR FURNACE 5.................
STARTING YOUR FURNACE 5.........................
SHUTTING DOWN YOUR FURNACE 7..................
PERFORMING ROUTINE MAINTENANCE 8.............
FILTERING OUT TROUBLE 9..........................
COMBUSTION AREA AND VENT SYSTEM 11...........
WINTERIZATION 13..................................
A CHECK--UP CHECKLIST 13..........................
BEFORE YOU REQUEST A SERVICE CALL 13...........
INSTALLATION DATA 14.............................
WELCOME TO TODAY’S GENERATION
OF COMFORT
Congratulations! In light of rising energy costs, a 90+% AFUE
Condensing Gas Furnace from Carrier Corporation is among the
soundest investments today’s homeowner can make.
Your new furnace is truly a triumph of technology in home
heating. A revolutionary design employs two heat exchangers to
“squeeze” out the maximum amount of heat from the fuel
consumed. In fact, your new furnace is so efficient, over 90%* of
the heat generated during combustion is captured and delivered
inside your home.
This furnace is among the safest, most dependable,
energy--efficient furnaces you can buy today. We are proud of the
technological advances incorporated into the design of this furnace.
With only minimal care, your new furnace will deliver many years
of money--saving home comfort and enjoyment. Spend just a few
minutes with this manual to learn the operation of your new
furnace and the small amount of maintenance it takes to help keep
it operating at peak efficiency year after year.
* The output capacity and any representations of efficiency for this furnace
are based on standard U.S. Department of Energy test procedures.
A11263
CERTIFIED
Always Ask For
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.
ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death, or property
damage.
Improper servicing could result in dangerous operation,
serious injury, death or property damage.
SBefore servicing, disconnect all electrical power to
furnace.
SWhen servicing controls, label all wires prior to discon-
necting. Reconnect wires correctly.
SVerify proper operation after servicing.
!WARNING

3
FURNACE COMPONENTS
(Furnace shown in upflow position; may be used in downflow or horizontal orientation or applications.
RATING PLATE NOT SHOWN
(LOCATED ON BLOWER DOOR)
GAS VALVE
MAIN LIMIT SWITCH
(BEHIND GAS VALVE)
REPRESENTATIVE DRAWING ONLY, SOME MODELS MAY VARY IN APPEARANCE.
ELECTRICAL JUNCTION
BOX (IF REQUIRED,
LOCATION MAY VARY)
MEDIA CABINET
OPERATING INSTRUCTIONS
NOT SHOWN (LOCATED ON
MAIN FURNACE DOOR, SEE
OPERATING INSTRUCTIONS
INSIDE DOOR FIGURE).
FURNACE
CONTROL
BOARD
MANUAL RESET
ROLLOUT SWITCH
FLAME
SENSOR
MANUAL RESET
ROLLOUT SWITCH
GAS BURNER
HOT SURFACE
IGNITER
INDUCER MOTOR
ASSEMBLY
BLOWER AND
MOTOR
CAPACITOR/
POWER CHOKE
BLOWER DOOR
SAFETY SWITCH
A11408
Fig. 1 -- Furnace Components

4
SAFETY CONSIDERATIONS
Installing and servicing of 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 and 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, CAUTION,
and NOTE. DANGER, WARNING, and CAUTION 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
may 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.
To minimize the possibility of serious personal injury, fire, damage
to your furnace, or improper operation, carefully follow these
safety rules which apply to both direct--vent and non--direct vent
applications:
SYour new gas furnace may have been installed in one of two
ways, as a direct--vent (2--pipe--Fig. 2) application or as a
non--direct vent (1--pipe--Fig. 3) application.
SIn a direct--vent (2--pipe) application, your furnace uses air
from outside the home for combustion and vents flue gas to the
outdoors. This type of application will have two pipes running
from the furnace to the outdoors. In some cases, the inlet air pipe
may be located in an area that has access to outdoor air, such as
an attic. In all cases, the outlet vent pipe must be routed to the
outdoors. (See Fig. 2.) In this application, the vent and
air--intake pipes must terminate outside the structure and must
not be obstructed in any way. Do not block or obstruct air
openings on furnace or spaces around furnace.
SIn a non--direct vent (1--pipe) application, your furnace uses
air from adjacent to the furnace for combustion and vents flue
gas to the outdoors. This type of application will have only one
pipe running from the furnace to the outdoors. (See Fig. 3.) The
other pipe will terminate in the same space as the furnace and is
the source of combustion air for your furnace. Therefore, the
furnace must not be enclosed in an airtight room or be sealed
behind solid doors. It must have adequate airflow for efficient
combustion and safe ventilation. Do not obstruct the
combustion--air pipe in any way. The vent pipe must terminate
outside the structure and must not be obstructed in any way. Do
not block or obstruct air openings or space around furnace.
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.
Do not keep combustible materials, gasoline, and other
flammable liquids or vapors around your furnace.
!WARNING
A11254
Fig. 2 -- Exterior Vent Pipes
A11255
Fig. 3 -- Interior Combustion -- Air Pipe

5
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
Do not keep combustible materials, gasoline, and other
flammable liquids or vapors around your furnace.
!WARNING
SKeep the area around your furnace clear and free of combustible
materials, gasoline, and other flammable liquids and vapors.
A92182
Fig. 4 -- NO combustible materials near furnace
SDo not cover the furnace, store trash or debris near it, or in any
way block the flow of fresh air to the unit.
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit
operation.
For proper and safe operation the furnace needs air for
combustion and ventilation. Do not block or obstruct air
openings on the furnace, air opening to the area in which the
furnace is installed, and the space around the furnace.
CAUTION
!
SIn addition to the safety rules above, make sure that the
following combustion--air requirements are met for non--direct
vent applications:
SCombustion air must be clean and uncontaminated with chlorine
or fluorine. These compounds are present in many products
around the home, such as: water softener salts, laundry bleaches,
detergents, adhesives, paints, varnishes, paint strippers, waxes,
and plastics.
SMake sure the combustion air for your furnace does not contain
any of these compounds. During remodeling be sure the
combustion air is fresh and uncontaminated. If these compounds
are burned in your furnace, the heat exchangers may deteriorate.
SA furnace installed in an attic or other insulated space must be
kept free and clear of insulating material. Examine the furnace
area when the furnace is installed or when insulation is added.
Some insulation materials may be combustible.
SShould the gas supply fail to shut off or if overheating occurs,
shut off the gas valve to the furnace before shutting off electrical
supply.
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.
BEFORE STARTING YOUR FURNACE
Examine the furnace installation to determine that:
1. All flue gas carrying areas external to the furnace (i.e. chim-
ney, vent connector) are clear and free of obstructions.
2. The vent connector is in place, slopes upward and is physic-
ally sound without holes or gaps.
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 sag-
ging cracks, gaps, etc. around the base.
5. There are no obvious signs of deterioration of the furnace.
6. The burner flames are in good adjustment, See Fig. 5 (by
comparison with pictorial sketches or drawings of the main
burner flame.)
Burner Flame
Burner
Manifold
A11461
Fig. 5 -- Burner Flame Adjustment
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
Should the gas supply fail to shut off or if overheating
occurs, turn off the manual gas valve to the furnace
BEFORE turning off the electrical supply and install
lockout tag.
!WARNING
STARTING YOUR FURNACE
Instead of a continuously burning pilot flame which wastes
valuable energy, 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:
SNever attempt to manually light the burners with a match
or other source of flame.
A92319
Fig. 6 -- Do Not Light Burner with Match

6
SRead and follow the operating instructions on inside of
main furnace door, especially the item that reads as fol-
lows: (See Fig. 31.)
“Wait 5 minutes to clear out any gas. Then smell for gas,
including near the floor. If you smell gas, STOP! Fol-
low “B” in the safety information on furnace label. If you
don’t smell gas, go to the next step.”
SIf a suspected malfunction occurs with your gas control
system, such as the burners do not light when they
should, refer to the shutdown procedures on inside of
main furnace door, or in the “Shutting Down Your Fur-
nace” section and call your dealer as soon as possible.
SCHECK AIR FILTER: Before attempting to start your
furnace, be sure the furnace filter is clean and in place.
See “Performing Routine Maintenance” section in this
manual. Do not run the furnace without a filter in place.
Then proceed as follows:
STEPS FOR STARTING YOUR FURNACE
1. Set your room thermostat to the lowest temperature setting
and set the “MODE” to “OFF”. See Fig. 7.
A09564
Fig. 7 -- Lowest Temperature Setting
2. Close the external manual gas valve. See Fig. 8.
C
L
O
S
E
A06188
Fig. 8 -- Close Valve
3. Turn OFF electrical supply to the furnace. See Fig. 9.
A92185
Fig. 9 -- Turn Off Electrical Supply
4. Remove the main furnace door. See Fig. 10.
A11256
Fig. 10 -- Remove Main Furnace Door (Upflow Configuration)
5. Turn the control switch on the gas control to the OFF position
and wait 5 minutes. See Fig. 11. Then smell for gas, including
near the floor. If you smell gas, STOP! Follow “B” on furnace
label. If you don’t smell gas, go to next step.

7
NAT.
GAS
CONSULT
MANUAL
BEFORE
ADJUSTING
GAS
PRESSURE
OFF
ON
GAS CONTROL SWITCH
SHOWN IN “OFF” POSITION
GAS CONTROL SWITCH
SHOWN IN “OFF” POSITION
TWO-STAGE GAS CONTROL
SINGLE-STAGE GAS CONTROL
MODULATING GAS CONTROL
A11292
Fig. 11 -- Control Switch to OFF
6. After waiting five minutes, turn control switch on the gas con-
trol to the ON position. Turn the control switch to ON. See
Fig. 12.
NAT.
GAS
CONSULT
MANUAL
BEFORE
ADJUSTING
GAS
PRESSURE
OFF
ON
GAS CONTROL SWITCH
SHOWN IN “ON” POSITION
TWO-STAGE GAS CONTROL
SINGLE-STAGE GAS CONTROL
GAS CONTROL SWITCH
SHOWN IN “ON” POSITION
MODULATING GAS CONTROL
A11291
Fig. 12 -- Control Switch to ON
7. Replace main furnace door. See Fig. 13.
A11257
Fig. 13 -- Furnace Door Replaced (Upflow Configuration)
8. Turn ON the electrical supply to the furnace and wait one
minute. See Fig. 14.
A92359
Fig. 14 -- Turn on Electrical Supply
9. Open the external manual gas valve. See Fig. 15.
O
P
E
N
A06189
Fig. 15 -- Open Valve
10. Set the room thermostat “MODE” to “HEAT” and adjust the
set point to a temperature slightly above the room temperat-
ure. This will automatically signal the furnace to start.
11. When the furnace receives the start signal, the combustion air
draft inducer is started. When the pressure switch senses that
there is sufficient combustion air, the hot surface igniter is en-
ergized.
After the hot surface igniter is heated for about 20 seconds, the
gas valve permits gas to flow to the main burners. After igni-
tion and a time delay of up to 60 sec, the furnace blower will
start. Variable--capacity furnaces start at low speed until the
control makes the necessary adjustments to operate the blower
at either the low-- or high--heat speed.
NOTE: If the main burners fail to ignite after four attempts, the
furnace control system will lock out. If lockout occurs, main
burners fail to light, or blower does not come on, shut down the
furnace and call your dealer for service.
12. Set your thermostat to the temperature that satisfies your
comfort requirements. SUGGESTION: Setting the thermo-
stat back a few degrees—and compensating for the differ-
ence with warmer clothing—can make a big difference in
your fuel consumption on extremely cold days. The few de-
grees at the top of your thermostat “comfort level” are the
most costly degrees to obtain.
When the room temperature drops below the temperature selected
on the thermostat, the furnace will switch on automatically. When
the room temperature reaches the setting selected on the thermostat,
the furnace will be automatically switched off.
Continuous Fan Operation --Some thermostats have a “FAN”
switch with two selections: AUTO and ON. When the thermostat is
set on AUTO, the furnace blower cycles on and off, controlled by
the thermostat. In ON position, the furnace blower runs
continuously. Continuous fan keeps the temperature level in your
home more evenly balanced. It also continuously filters the indoor
air.

8
Comfort Fant-- On all but the base series furnace, the blower
speed can be increased or decreased if desired due to change of
seasons, large gatherings in your home, etc. Simply change your
FAN from ON to OFF for 1 to 3 seconds (or AUTO depending on
your thermostat), and then return to ON. The blower will switch to
the next higher speed. There are at least three speeds to choose
from. If the blower is running on its highest speed, a request to
change will direct the blower to return to its lowest speed.
SHUTTING DOWN YOUR FURNACE
Should you need to shut down your furnace for service or
maintenance, you will need to turn the furnace off. The following
procedures must be followed:
1. Set your room thermostat to the lowest temperature setting
and set the “MODE” to “OFF.” See Fig. 16.
A09564
Fig. 16 -- Lowest Temperature Setting
2. Close the external manual gas valve. See Fig. 17.
C
L
O
S
E
A06188
Fig. 17 -- Close the External Manual Valve
3. Turn off electrical supply to the furnace. See Fig. 18.
A92185
Fig. 18 -- Turn Off Electrical Supply
4. Remove main furnace door. See Fig. 10.
5. Turn control switch on the gas control to OFF position. See
Fig. 19.
NAT.
GAS
CONSULT
MANUAL
BEFORE
ADJUSTING
GAS
PRESSURE
OFF
ON
GAS CONTROL SWITCH
SHOWN IN “OFF” POSITION
GAS CONTROL SWITCH
SHOWN IN “OFF” POSITION
TWO-STAGE GAS CONTROL
SINGLE-STAGE GAS CONTROL
MODULATING GAS CONTROL
A11292
Fig. 19 -- Control Switch to OFF
6. Replace main furnace door. See Fig. 13.
7. If the furnace is being shut down because of a malfunction, call
your dealer as soon as possible.
UNIT AND PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in unit component or
property damage.
Furnace is not to be installed, operated, and then turned off
and left turned off in an unoccupied structure during winter.
See “Winterization” procedures in this manual.
CAUTION
!
PERFORMING ROUTINE MAINTENANCE
NOTE: The qualified installer or agency must use only
factory--authorized replacement parts, kits, and accessories when
modifying this product.
Installing and servicing of 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 and 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.
With proper maintenance and care, your furnace will operate
economically and dependably. Instructions for basic maintenance
are found on this and the following pages. However, before
beginning maintenance, follow these safety precautions:
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Turn off electrical power supply to your furnace and
install lockout tag before removing the access doors to
service or perform maintenance.
!WARNING

9
CUT HAZARD
Failure to follow this caution may result in personal injury.
Although special care has been taken to minimize sharp
edges, be extremely careful when handling parts or reaching
into the furnace. Wear safety glasses, gloves, and
appropriate protective clothing.
CAUTION
!
FILTERING OUT TROUBLE
NOTE: The manufacturer has specified filters which will enable
your furnace to provide lasting comfort and efficiency throughout
its life. Contact your dealer to help you choose filters for your
furnace that both collect dirt before it enters your furnace, as well
as provide a low resistance to circulating air. Avoid filters that
report high cleaning efficiencies, but do not allow air to pass easily
through them.
UNIT PERFORMANCE HAZARD
Failure to follow this caution may result in unit component
damage.
Never operate your furnace without a filter in place. Doing
so may damage the furnace blower motor. An
accumulation of dust and lint on internal parts of your
furnace can cause a loss of efficiency.
CAUTION
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Use care when cutting support rods in filters to protect against
flying pieces and sharp rod ends. Wear safety glasses, gloves,
and appropriate protective clothing.
CAUTION
!
A dirty filter will cause excessive stress on the furnace, heat
exchanger, and blower motor, and can cause it to overheat and
automatically shut down. The furnace filter should be checked
every four weeks and be cleaned or replaced if necessary.
If installed with factory--specified disposable media filter, check or
replace filter before each heating and cooling season. Replace
disposable media filter at least once a year.
If your furnace filter needs replacing, be sure to use the same size
and type of filter that was originally specified.
The air filter for the furnace may be located in an external filter
cabinet attached to the side or bottom of the furnace casing. If the
air filter has been installed in another location, contact your dealer
for instructions. To inspect, clean and/or replace the air filter(s),
follow these steps:
1. Turn off electrical supply to the furnace. See Fig. 20.
2. Remove air filter from the filter cabinet.
a. Remove filter cabinet door. (See Fig. 21 and 22.)
NOTE: It may be necessary to remove one thumbscrew.
b. Slide air filter out of furnace. Keep dirty side up (if
dirty) to avoid spilling dirt.
3. Inspect the filter. If torn, replace it.
NOTE: If a washable filter was supplied with the furnace and has
been replaced by:
SDisposable media filter----Do not clean. If dirty, replace
only with media filter having the same part number and
size. Install with airflow direction arrow pointing to-
wards blower.
SElectronic Air Cleaner (EAC), refer to the EAC Owner’s
Manual for maintenance information.
4. If washable filter, wash filter (if dirty) in a sink, bathtub, or
outside with a garden hose. Always use cold tap water. A
mild liquid detergent may be used if necessary. Spray water
through filter in the opposite direction of airflow. Allow fil-
ter to dry.
5. Reinstall clean air filter.
6. Turn on electrical supply to the furnace.
If your furnace air filter needs to be replaced, be sure to use a
factory--authorized filter of the same size that was originally
specified. Use the filter tables and compare your furnace size with
the proper filter size.
A92185
Fig. 20 -- Turn Off Electrical Supply
A00225
Fig. 21 -- Removal of Filter Cabinet Door from Side Blower
Cabinet

10
A00226
Fig. 22 -- Removal of Filter Cabinet Door from Bottom
Blower Cabinet
A00227
Fig. 23 -- Removal of Filter from Side Blower Cabinet
A00228
Fig. 24 -- Removal of Filter from Bottom Blower Cabinet
A00229
Fig. 25 -- Replacement of Filter Cabinet Door to Side Blower
Cabinet
A00230
Fig. 26 -- Replacement of Filter Cabinet Door to Bottom Blower Cabinet
Table 1 – Air Filter Located in Filter Cabinet
FILTER CABINET HEIGHT --- IN (MM) F I LT E R S I Z E --- I N ( M M ) FILTER TYPE
16 (406)
(1) 16 x 25 x 3/4*
(406 x 635 x 19) or
(1) 16 x 25 x 4---5/16
(406 x 635 x 110)
Washable{
20 (508)
(1) 20 x 25 x 3/4*
(508 x 635 x 19) or
(1) 20 x 25 x 4---5/16
(508 x 635 x 110)
Washable{
24 (610)
(1) 24 x 25 x 3/4*or
(610 x 635 x 19) or
(1) 24 x 25 x 4---5/16
(610 x 635 x 110)
Washable{
*Filters with a side return--air may have a different filter size. Measure the filter to obtain the correct size.
{Recommended to maintain air filter face velocity. See Product Data for part number.

11
COMBUSTION AIR AND VENT SYSTEM
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury
or death.
If holes are found or if the vent pipe is obstructed or is not
connected, toxic fumes can escape into your home. DO NOT
OPERATE YOUR FURNACE. Call your dealer for service.
!WARNING
UNIT OPERATION HAZARD
Failure to follow this caution may result in intermittent unit
operation.
For proper and safe operation the furnace needs air for
combustion and ventilation. Do not block or obstruct air
openings on the furnace, air opening to the area in which the
furnace is installed, and the space around the furnace.
CAUTION
!
Visually inspect the combustion area and vent system before each
heating season. Make sure that all PVC pipes leading into the
combustion area and vent are free from any cracks and sags. An
accumulation of dirt, soot, or rust can mean a loss of efficiency and
improper performance. Buildups on the main burners can cause
faulty firing. This “delayed ignition” is characterized by an
alarmingly loud sound.
Check the combustion--air intake adjacent to the furnace or outside
your home for blockage. Also check the vent pipe on the outside of
your home for blockage.
NOTE: If your furnace makes a loud noise when the main burners
are ignited, shut down the furnace and call your servicing dealer.
Use your flashlight and follow these steps for inspecting the
combustion area and vent system of your furnace:
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
If dirt, rust, soot, or scale accumulations are found, call
your dealer. Do not operate your furnace.
!WARNING
1. Turn off electrical supply and gas supply to the furnace and
remove the main furnace door. See Fig. 7, 8, 9, 10 and 11.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Turn off electrical power supply to your furnace and
install lockout tag before removing the access doors to
service or perform maintenance.
!WARNING
2. Inspect the gas burners, igniter area, and remainder of fur-
nace for dirt, rust, soot or scale.
GAS BURNER
HOT SURFACE
IGNITOR
GAS VALVE
MAIN LIMIT SWITCH
(BEHIND GAS VALVE)
FLAME
SENSOR
MANUAL RESET
LIMIT SWITCH
MANUAL RESET
LIMIT SWITCH
ASSEMBLY
A11319
Fig. 27 -- Gas Burner Assembly (Upflow)
GAS BURNER
HOT SURFACE
IGNITOR
GAS VALVE
MAIN LIMIT SWITCH
(BEHIND GAS VALVE)
FLAME
SENSOR
MANUAL RESET
LIMIT SWITCH
MANUAL RESET
LIMIT SWITCH
ASSEMBLY
A11320
Fig. 28 -- Gas Burner Assembly (Downflow)
3. Inspect the combustion--air and vent PVC pipes for sags,
holes, cracks, water leaks, blockage or disconnections. Hori-
zontal portions of vent pipe must slope downward toward
the furnace.
4. If your furnace is free of the above conditions turn on elec-
trical and gas supplies to the furnace.
5. Start your furnace and observe its operation. Watch the
burner flames to see if they are clear blue, almost transpar-
ent.. If you observe a suspected malfunction, or the burner
flames are not clear blue, call your dealer.
6. Replace main furnace door.
Burner Flame
Burner
Manifold
A11461
Fig. 29 -- Burner Flame Adjustment

12
WINTERIZATION
UNIT AND PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in unit component or
property damage.
If the furnace is installed in an unconditioned space where the
ambient temperatures may be 32_F(0_C) or lower, freeze
protection measures must be taken to prevent minor property
or product damage.
CAUTION
!
Since the furnace uses a condensing heat exchanger, some water
will accumulate in the unit as a result of the heat transfer process.
Therefore, once it has been operated, it cannot be turned off and
left off for an extended period of time when temperatures will
reach 32_F(0_C) or lower unless winterized. Follow these
procedures to winterize your furnace:
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the
furnace and other property damage.
Do not use ethylene glycol (automotive antifreeze coolant or
equivalent). Failure of plastic components may occur.
CAUTION
!
1. Obtain propylene glycol (RV/swimming pool antifreeze or
equivalent).
2. Turn off gas and electrical supplies to your furnace.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Turn off electrical power supply to your furnace and
install lockout tag before removing the access doors to
service or perform maintenance.
!WARNING
3. Remove furnace control compartment door.
4. Remove one of the unused rubber plugs in the port on the
collector box opposite the condensate trap. See Fig 31.
5. Connect a field supplied 3/8-in. (9.5-mm) ID tube to the
open port on the collector box
6. Insert a field supplied funnel into the tube.
7. Pour 1 quart of anti-freeze solution into the funnel/tube.
Antifreeze should run through the inducer housing, overfill
condensate trap and flow to an open drain.
8. If a condensate pump is used, check with pump
manufacturer to verify pump is safe for use with antifreeze
used. Allow pump to start and pump anti-freeze to open
drain.
9. Remove funnel and tube from collector box.
10. Replace plug in collector box.
11. Remove the other plug and repeat steps 4--10.
12. Replace main door.
13. When furnace is re-started, flush condensate pump with
clear water to check for proper operation before re-starting
furnace.
14. Propylene glycol need not be removed before re-starting
furnace.
A11392
Fig. 30 -- Winterizing Furnace

13
A CHECK--UP CHECKLIST
Your furnace represents an important investment in your family’s
comfort and your home’s value. To keep it performing properly
and to prevent future problems, have a trained service specialist
give your furnace a professional check--up annually. The following
checklist can be used as a guideline to proper service:
SInspect all flue gas passages, burners, heat exchangers, coupling
box(es), and inducer assembly.
SInspect all combustion--air and vent piping inside structure and
pipe terminations outside the structure.
SCheck gas pipes leading to and inside of your furnace for leaks.
SInspect and clean the blower motor and wheel.
NOTE: The inducer and blower motors are pre--lubricated and
require no additional lubrication. These motors can be identified by
the absence of oil ports on each end of the motor.
SInspect and change or clean air filter(s) if necessary.
SInspect all supply-- and return--air ducts for obstructions, air
leaks, and insulation. Remedy any problem when necessary.
SInspect the return--air duct connection(s) at the furnace to ensure
it is physically sound, sealed to the furnace casing, and
terminates outside the space containing the furnace.
SInspect electrical wiring, connections, and components for loose
connections.
SPerform an operational checkout to determine whether your
furnace is working properly and if it requires adjustments.
SInspect all condensate drain tubes and condensate trap assembly
for leaks. The condensate removal system should be cleaned
annually by a qualified service agency. Refer to the Service and
Maintenance Instructions Guide for further information.
SExamine the physical support of the furnace. Support should be
sound with no cracks, sagging, gaps, etc. around the base.
SCheck furnace for any obvious signs of deterioration.
Ask your servicing dealer for further details about an economical
service contract that covers seasonal inspections.
FOR YOUR SAFETY READ BEFORE OPERATING
A11318
Fig. 31 -- Operating Instructions Inside Door
BEFORE YOU REQUEST A
“SERVICE CALL”
If your furnace is not operating or not performing properly,
you may save the expense of a service call by checking a few
things yourself before calling for service.
This furnace has a light emitting diode (LED) status code display
to aid the installer, service technician, or homeowner while
installing or servicing the unit. The LED code can be seen through
the view port in the blower access panel.
NOTE: Record the LED status code BEFORE removing the
blower access door or turning off 115--v power to the furnace.
See the information booklet inside the main furnace door for a
service code legend. See Fig. 31.
For insufficient airflow:
SCheck for dirty air filter(s).
SCheck for blocked return--air or supply--air grilles. Be sure they
are open and unobstructed.
If problem still exists, call your dealer for service.
If furnace fails to operate:
Follow this checklist step by step, advancing to the next stop only
if furnace fails to start.
SCheck thermostat for proper temperature. Is thermostat set above
room temperature?
SIs thermostat set to HEAT mode?
SCheck fuses and circuit breakers. Is the electrical power supply
switch on?
SIs the manual shut--off valve in the gas supply pipe leading to
the furnace open?
NOTE: Turn off electrical supply before continuing with
checklist.
SIs control switch on gas valve in ON position? (Follow start--up
procedures if you must reset switch to ON position.)
SCheck manual reset rollout switch located on the burner box.
See Furnace Components in Fig. 1. If furnace has experienced
high temperature conditions, this switch will shut off the
furnace. Reset it by pushing the button on the switch. If it trips
again, shut down the furnace and call for service. See “Shutting
Down Your Furnace” section in this manual.
SCheck for obstructions around the vent termination.
If your furnace still fails to operate, call your service representative.
For your convenience, record the furnace product and serial
numbers on back page. Should you ever require service, you will
have ready access to the information needed by your service
representative.

14
NOTE TO EQUIPMENT OWNER:
For your convenience, please record the model and serial numbers of your new equipment in the spaces
provided. This information, along with the installation data and dealer contact information will be helpful
should your system require maintenance or service.
FURNACE
Model # _____________________________________
Serial # ______________________________________
AIR CONDITIONER OR HEAT PUMP
Model # _____________________________________
Serial # _____________________________________
INDOOR COIL (Furnace Coil or Fan Coil)
Model # _____________________________________
Serial # _____________________________________
INSTALLATION INFORMATION:
Date Installed ________________________________
DEALERSHIP CONTACT INFORMATION:
Company Name_______________________________
Address______________________________________
_____________________________________________
Phone Number _______________________________
Technician Name _____________________________
_____________________________________________
_____________________________________________
NOTE TO INSTALLER:
This manual must be left with the equipment owner.
Copyright 2011 Carrier Corp. S7310 W. Morris St. SIndianapolis, IN 46231 Printed in U.S.A. Edition Date: 08/11
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No: OM9GFC---03
R e p l a c e s : O M 9 G F C --- 0 2