Grandaire WFHR User manual

440 02 7000 02 Sept. 2009
Specifications subject to change without notice.
Owner’s Manual
CONDENSING GAS FURNACE
WFHR
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 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.
!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!
Payne Heating and Cooling Systems recommends 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
CERTIFIED
A08174
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

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Specifications subject to change without notice.
440 02 7000 02
TABLE OF CONTENTS
WELCOME TO A NEW GENERATION OF COMFORT 2. . . .
FURNACE COMPONENTS 2. . . . . . . . . . . . . . . . . . . . . . . . . . .
GENERAL FURNACE SAFETY 2. . . . . . . . . . . . . . . . . . . . . . .
IMPORTANT FACTS 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SAFETY CONSIDERATIONS 3. . . . . . . . . . . . . . . . . . . . . . . . .
BEFORE STARTING YOUR FURNACE 4. . . . . . . . . . . . . . . . .
STARTING YOUR FURNACE 5. . . . . . . . . . . . . . . . . . . . . . . . .
Steps for Starting Your Furnace 5. . . . . . . . . . . . . . . . . . . . . . . .
SHUTTING DOWN YOUR FURNACE 6. . . . . . . . . . . . . . . . . .
PERFORMING ROUTINE MAINTENANCE 7. . . . . . . . . . . . .
Filtering Out Trouble 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
COMBUSTION AREA AND VENT SYSTEM 9. . . . . . . . . . . .
INSTALLATION DATA 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
BEFORE YOU REQUEST A SERVICE CALL 11. . . . . . . . . . .
REGULAR DEALER MAINTENANCE 11. . . . . . . . . . . . . . . .
WELCOME TO TODAY’S GENERATION
OF COMFORT
Congratulations! In light of rising energy costs, the WFHR
Multipoise, Fixed−Capacity, Direct/Non−Direct Vent, Condensing
Gas Furnaces are 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 (2) 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. That is more than a 30%* increase in heating
efficiency over conventional furnaces.
This furnace is among the most energy−efficient furnaces you can
buy today. The WFHR is also among the safest and most
dependable. 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.
GENERAL FURNACE SAFETY
1. Combustible Materials, Gasoline Warning. . . . . . . . . . . . . 1
2. Furnace Must be Kept Free and Clear of Insulating Material
Warning. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Furnace Needs Air for Combustion and Ventilation
Warning . . . . . . . . . . . . . . . . . . . . . .. .. . . . . . . . . . . . . . . . 4
4. Starting (Lighting) and Shutting Down the
Furnace Warning .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5, 6
5. Proper Furnace Shutdown Procedures . . . . . . . . . . . . . . . . 6
6. Flood Damage Warning . . . . . . . . . . . . . . . . . . . . . . . . . . 1
7. Fire or Explosion Hazard Warning. . . . . . . . . . . . . . . . . . . 1
8. Carbon Monoxide Warning . . . . . . . . . . . . . . . . . . . . . . . . 1
9. Service and Maintenance Electrical Hazard Warning . . . . . 7
10. Sharp Edges Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
11. No Filter Caution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
12. Dirt, Rust, or Accumulation Caution . . . . . . . . . . . . . . . . . 9
FURNACE COMPONENTS
(Furnace shown in upflow position; may be used in downflow or
horizontal orientation or applications.)
Figure 1 Furnace shown in upflow position
Air filter and retainer. (Location in furnace may vary.)
Rollout switch (manual reset) to prevent
over temperature.
1 Burner sight glass for viewing burner flame.
2 Burner assembly (inside), operates with en-
ergy−saving, inshot burners and hot surface ig-
niter for safe, dependable heating.
3 Combustion−air intake connection (right or left
side).
4 Redundant gas valve. Safe and efficient. Features
1 gas control with 2 internal shutoff valves.
5 Junction box for 115−v electrical power supply.
6 Vent outlet, uses PVC pipe to carry flue gas from
the furnace’s combustion system (right or left
side).
7 Secondary condensing heat exchanger (inside).
Wrings out more heat through condensation. Con-
structed with polypropylene−laminated steel to
ensure durability.
8 Pressure switch ensures adequate flow of flue gas
through furnace and out vent system.
9 Inducer motor. Pulls hot flue gases through the
heat exchangers, maintaining negative pressure for
added safety.
10 Condensate drain connection, collects moisture
condensed from burned gases for disposal into
home drain system. (location in furnace varies)
11 Heavy−duty blower, circulates air across the heat
exchangers to transfer heat into the home.

3440 02 7000 02
Specifications subject to change without notice.
12 Air filter and retainer. (Location in furnace may
vary.)
13 Rollout switch (manual reset ) to prevent overtem-
perature.
14 Primary serpentine heat exchanger (inside),
stretches fuel dollars with the S−shaped heat−flow
design. Solid construction of corrosion−resistant
aluminized steel means reliability.
15 3−amp fuse provides electrical and com-
ponent protection.
16 Status code light emitting diode (LED) on furnace
control board. Status code light is for diagnosing
furnace operation and service requirements.
17 Furnace control board.
18 Blower access panel safety interlock switch.
19 Transformer (24v) behind furnace control board
provides low−voltage power to furnace control
board and thermostat.
IMPORTANT FACTS (DO’S AND DON’TS)
SDO: READ AND UNDERSTAND THIS MANUAL.
SDO: Have your furnace and vent system inspected annually by a
qualified service technician.
SDO: Inspect your filter monthly and clean or replace when
needed.
SDO: Provide adequate airflow to the furnace for efficient
combustion and safe ventilation.
SDO: 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.
SDO NOT: Enclose your furnace in an airtight room or seal it
behind solid doors.
SDO NOT: Keep combustible materials, gasoline, and other
flammable liquids or vapors around your furnace.
SDO NOT: Cover your furnace in any manner.
SDO NOT: Store anything (including trash or debris) near your
furnace.
SDO NOT: In any way block or restrict airflow around your
furnace.
SDO NOT: In any way block or restrict airflow to your supply air
and return air grills.
SDO NOT: Use your furnace room as a broom closet or a place to
store any kind of chemical or cleaner.
SDO 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.
ELECTRICAL OPERATION 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
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.
!WARNING
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 per-
formed 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 haz-
ards 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, re-
liability, 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 applica-
tions:
Your new gas furnace may have been installed in 1 of 2 ways, as a dir-
ect−vent (2−pipe−Figure 2) application or as a non−direct vent
(1−pipe−Figure 3) application.
In a direct−vent (2−pipe) application, your furnace uses air from out-
side the home for combustion and vents flue gas to the outdoors. This
type of application will have 2 pipes running from the furnace 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.
In a non−direct vent (1−pipe) application, your furnace uses air from
adjacent to the furnace for combustion and vents flue gas to the out-

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Specifications subject to change without notice.
440 02 7000 02
doors. This type of application will have only 1 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 air-
tight room or be sealed behind solid doors. It must have adequate air-
flow for efficient combustion and safe ventilation. Do not obstruct the
combustion−air pipe in any way. The vent pipe must terminate out-
side the structure and must not be obstructed in any way. Do not block
or obstruct air openings or space around furnace.
Figure 2 Exterior Vent Pipes
Figure 3 Interior Combustion−air pipe
Keep the area around your furnace clear and free of com-
bustible materials, gasoline, and other flammable liquids and va-
pors (Figure 4).
Figure 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.
In addition to the safety rules above, make sure that the following
combustion−air requirements are met for non−direct vent applica-
tions:
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 exten-
ded 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.
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.

5440 02 7000 02
Specifications subject to change without notice.
6. The burner flames are in good adjustment, Figure 5 (by
comparison with pictorial sketches or drawings of the main
burner flame).
Figure 5 Burner flame adjustment
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:
SNever attempt to manually light the burners with a match
or other source of flame (Figure 6).
Figure 6 Do Not Light Burner with Match
SRead 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 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
Furnace” section and call your dealer as soon as possible.
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
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
(Figure 7).
Figure 7 Lowest Temperature Setting
2. Close the external manual gas valve (Figure 8).
Figure 8 Close Valve
C
L
O
S
E
3. Turn OFF electrical supply to the furnace (Figure 9).
Figure 9 Turn Off Electrical Supply
4. Remove the main furnace door (Figure 10).
Figure 10 Remove Furnace Door
5. Turn the control switch on the gas control to the OFF position
and wait 5 minutes. See Figure 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.

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Specifications subject to change without notice.
440 02 7000 02
Figure 11 Control Switch to OFF
GAS CONTROL SWITCH
SHOWN IN “OFF POSITION
6. After waiting 5 minutes, turn control switch on the gas control
to the ON position. Turn the control switch to ON (Figure 12)
Figure 12 Control Switch to ON
GAS CONTROL SWITCH
SHOWN IN “ON” POSITION
7. Replace main furnace door (Figure 13).
Figure 13 Furnace Door Replaced
8. Turn ON the electrical supply to the furnace and wait 1 minute
(Figure 14).
Figure 14 Turn On Electrical Supply
9. Open the external manual gas valve. See Figure 15.
Figure 15 Open Valve
O
P
E
N
10. Set the room thermostat to a temperature slightly above the
room temperature. This will automatically signal the furnace
to start. The inducer motor will start and the hot surface igniter
will energize. When hot, the igniter will have an orange glow.
11. After about 17 seconds, the gas valve permits gas to flow to the
main burners where it is ignited. Hot flames begin to warm
the furnace’s heat exchanger. After a time delay of approxim-
ately 25−45 seconds the furnace blower is switched on.
NOTE: If the main burners fail to ignite, the furnace control
system will go through three more ignition cycles. Then if burners
fail to ignite, the system will lockout. If lockout occurs or the
blower does not come on, shut down your furnace and call your
dealer for service.
12. Set your thermostat to the temperature that satisfies your
comfort requirements. SUGGESTION: Setting the
thermostat back a few degrees—and compensating for the
difference with warmer clothing—can make a big difference
in your fuel consumption on extremely cold days. The few
degrees 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 2 selections: AUTO and ON. When thermostat is set
on AUTO, the furnace blower cycles on and off, controlled by the
thermostat. In ON position, the furnace blower runs continuously
except for a 42−62 sec delay at the “call for heat.” Continuous fan
keeps the temperature level in your home more evenly balanced. It
also continuously filters the indoor air.
SHUTTING DOWN YOUR FURNACE
Should you ever suspect a malfunction in your furnace, you will
need to turn the furnace off. The following procedures must be
followed:
1. Set your room thermostat to the lowest temperature setting.
(Figure 16)
Figure 16 Lowest Temperature Setting

7440 02 7000 02
Specifications subject to change without notice.
2. Close the external manual gas valve (Figure 17).
Figure 17 Close the external manual gas valve
3. Turn off electrical supply to the furnace (Figure 18).
Figure 18 Turn Off Electrical Supply
4. Remove main furnace door.
5. Turn control switch on the gas control to OFF position
(Figure 19).
Figure 19 Gas control switch to OFF
O
F
F
ON
GAS CONTROL SWITCH
SHOWN IN “OFF” POSITION
6. Replace main furnace door.
7. If the furnace is being shut down because of a malfunction, call
your dealer as soon as possible.
PERFORMING ROUTINE MAINTENANCE
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 before
removing the access doors to service or perform
maintenance.
!WARNING
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
UNIT PERFORMANCE HAZARD
Failure to follow this caution may result in product 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
!
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 4 weeks and 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 twice 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 the blower
compartment or in a filter cabinet/rack attached to the side or
bottom of the furnace. If 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 (Figure 20).
Figure 20 Turn OFF electrical supply
2. Remove main furnace door (Figure 21).
Figure 21 Main furnace door

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Specifications subject to change without notice.
440 02 7000 02
3. Remove blower access panel (Figure 22).
Figure 22 Blower access panel
4. Remove air filter from furnace.
SAIR FILTER(S) LOCATED IN END OF FURNACE:
a. Slide air filter retainer sideways until it is free of latch
(Figure 23).
b. Slide air filter out of furnace (Figure 24).
Figure 23 Air filter in end of furnace
Figure 24 Slide filter out of furnace
SAIR FILTER(S) LOCATED IN SIDE OF FURNACE:
c. Remove air filter retainer from latch (Figure 25).
d. Gently remove air filter and carefully turn the dirty side
up (if dirty) to avoid spilling dirt from the filter
(Figure 26).
Figure 25 Air filter retainer
Figure 26 Slide filter out of furnace
5. Inspect the filter. If torn, replace it.
NOTE: If the filter with the furnace has been replaced with an
electronic air cleaner (EAC), refer to the EAC Owner’s Manual for
maintenance information.
6. 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.
7. Reinstall clean air filter.
8. Reinstall filter retainer.
9. Replace blower access panel and main furnace door with
two (2) screws. Turn on electrical supply to the furnace.

9440 02 7000 02
Specifications subject to change without notice.
FURNACE CASING WIDTH
IN (MM)
FILTER QUANTITY AND SIZE *
FILTER TYPE*
SIDE RETURN
IN (MM)
BOTTOM RETURN
IN (MM)
17-1/2 (445) (1) 16 x 25 x w
(406 x 635 x 19)
(1) 16 x 25 x w
(406 x 635 x 19) w” (19 mm) thick cleanable
21 (533 ) (1) 16 x 25 x w
(406 x 635 x 19)
(1) 20 x 25 x w
(508 x 635 x 19) w” (19 mm) thick cleanable
24-1/2 (610) (1) 16 x 25 x w
(406 x 635 x 19)
(1) 24 x 25 x w
(610 x 635 x 19) w” (19 mm) thick cleanable
* Filters with a side return−air may have a different filter size. Measure the filter to obtain the correct size.
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
!
Alternate sizes and additional filters may be ordered from your
dealer.
COMBUSTION AREA AND VENT SYSTEM
UNIT OPERATION HAZARD
Failure to follow this caution may result in personal injury.
Failure to follow this warning could result in personal injury
or death.
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:
1. Turn off electrical supply to the furnace and remove the
main furnace door. (See Figure 20 and Figure 21)
2. Remove burner enclosure front Figure 27 & Figure 28.
Figure 27 Upflow burner enclosure
Figure 28 Downflow burner enclosure
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.
Figure 29 Burner Flame
4. Reinstall burner enclosure front.
5. If your furnace is free of the above conditions, replace main
furnace door and turn on electrical and gas supplies to the
furnace.
6. Start your furnace and observe its operation. Watch the
burner flames to see if they are clear blue, almost transpar-
ent. (See Figure 29). If you observe a suspected malfunc-
tion, or the burner flames are not clear blue, call your dealer.

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Specifications subject to change without notice.
440 02 7000 02
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
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
HEADING SOUTH FOR THE WINTER?
DON’T FORGET YOUR FURNACE!
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 or lower unless winterized. Follow these procedures to
winterize your furnace:
1. Obtain propylene glycol (RV/swimming pool antifreeze or
equivalent).
2. Turn off electrical supply to your furnace.
3. Remove main furnace door.
4. Remove upper inducer housing drain connection cap.
(Figure 30)
5. Connect field−supplied 1/2−in. ID tube to upper inducer
housing drain connection.
6. Insert field−supplied funnel into tube.
7. Pour 1 quart of antifreeze into funnel/tube. Antifreeze
should run through inducer housing, overfill condensate
trap, and flowinto open field drain. (Figure 31)
8. Remove funnel and tube from inducer housing and replace
drain connection cap and clamp.
9. Replace main furnace door.
10. Propylene glycol need not be removed before restarting
furnace.
Figure 30 Drain Connection Cap
Figure 31 Antifreeze into funnel/tube

11 440 02 7000 02
Specifications subject to change without notice.
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.
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.
NOTE: Record the LED status code BEFORE removing the
blower access door or turning off 115−v power to the furnace.
Removing the blower access door or turning off the 115−v power
will end the LED status code display and erase the code from the
control’s memory.
SCheck for sufficient airflow. Check the air filter for dirt. Check
for blocked return−air or supply−air grilles. Be sure they are
open and unobstructed.
If furnace fails to operate:
SCheck thermostat for proper temperature. Is thermostat set above
room temperature?
SIs thermostat set to HEAT mode?
SIs the electrical power supply switch on? Is the blower access
door firmly in place? Are any fuses blown? (There is a fuse on
the furnace control.) Has a circuit breaker tripped?
NOTE: Turn off electrical supply before continuing with
checklist.
SIs the manual shut−off valve in the gas supply pipe leading to
the furnace open? Does the lever point in the same direction that
the pipe runs (open)? Or is it at a right angle to the pipe (closed)?
SCheck manual reset flame rollout switch located on the burner
box. (See 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’s
section in this manual.
SCheck for obstructions around the vent termination.
UNIT OPERATION HAZARD
Failure to follow this caution may result in personal injury.
If for some reason the vent is blocked, the draft safeguard
switch will shut off the furnace. (See Page 2 for switch
location.) The switch will automatically reset after the furnace
cools off. If the furnace fails to operate, contact a qualified
service agency.
CAUTION
!
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.
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 by
removing the main furnace door and viewing LED through the
view port in the blower access panel.
Regular dealer maintenance
In addition to the type of routine maintenance you might be willing
to do, your furnace should be inspected regularly by a properly
trained service technician. A semiannual inspection (or annual
inspection, at least) should include the following:
1. Inspection of all flue gas passages including the burners,
heat exchanger, inducer, elbow, and vent pipe.
2. Inspection of all combustion and ventilation air passages
and openings.
3. Close check of all gas pipes leading to and inside of your
furnace.
4. Inspection and cleaning of the blower motor and wheel.
5. Routine inspection and cleaning/replacement of the air filter.
6. Inspection of all supply−and return−air ducts for
obstructions, air leaks, and insulation. Any problems found
should be resolved at this time.
7. Inspection of furnace installation for proper support and any
obvious deterioration of the furnace. The support must be
sound and without sags, gaps, cracks, etc., around the
furnace base so as to provide an air seal between the
return−airduct and furnace.
8. A check for loose connections attaching individual
components. Inspection of all electrical wiring and their
connections.
9. Operational check of the furnace itself to determine working
condition. Repair or adjustment should be made at this time.
Ask your servicing dealer for further details about an economical
service contract that covers seasonal inspections.

440 02 7000 02
Specifications subject to change without notice.
12
International Comfort Product, LLC SPO Box 128 SLewisburg, TN 37091 USA
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.