Whirlpool WFAU User manual

80% GAS FURNACE INSTALLATION INSTRUCTIONS
GAS FURNACE SAFETY
Table of Contents
GAS FURNACE SAFETY................................................................1
INSTALLATION REQUIREMENTS................................................3
Tools and Parts ............................................................................3
Location Requirements................................................................3
Installation Configurations ...........................................................4
Duct Work Requirements.............................................................6
Electrical Requirements ...............................................................6
Gas Supply Requirements...........................................................6
Venting Requirements..................................................................6
INSTALLATION INSTRUCTIONS..................................................8
Inspect Shipment .........................................................................8
Plan Vent System.........................................................................8
Connect Venting.........................................................................11
Install Duct Work ........................................................................11
Filter Specifications....................................................................11
Make Electrical Connections .....................................................12
Make Gas Connections..............................................................13
Check the Furnace Input Rate ...................................................13
Adjust the Furnace Input Rate ...................................................14
Complete Installation..................................................................15
Sequence of Operation ..............................................................16
Controls ......................................................................................16
TROUBLESHOOTING ..................................................................17
ASSISTANCE OR SERVICE.........................................................20
Accessories ................................................................................20
46924D003
Whirlpool®Home Cooling and Heating
7901 S.W. 6th Court
Plantation, Florida 33324
Models WFAU, WFAR, WFAT
WFLU, WFLR, WFLT
You can be killed or seriously injured if you don't
immediately follow instructions.
You can be killed or seriously injured if you don't
follow instructions.
All safety messages will tell you what the potential hazard is, tell you how to reduce the chance of injury, and tell you
what can happen if the instructions are not followed.
Your safety and the safety of others are very important.
We have provided many important safety messages in this manual and on your appliance. Always read and obey all
safety messages.
This is the safety alert symbol.
This symbol alerts you to potential hazards that can kill or hurt you and others.
All safety messages will follow the safety alert symbol and either the word “DANGER” or
“WARNING.” These words mean:

2
ADDITIONAL SAFETY INFORMATION
SAVE THESE INSTRUCTIONS
IMPORTANT SAFETY INSTRUCTIONS
■ Use only with type of gas approved for this furnace.
Refer to the furnace rating plate.
■ Install this furnace only in a location and position as
specified in the Location Requirements section of
these instructions.
■ Provide adequate combustion and ventilation air to the
furnace space as specified in the “Venting
Requirements” section of these instructions.
■ Combustion products must be discharged outdoors.
Connect this furnace to an approved vent system
only, as specified in the “Venting Requirements”
section of these instructions.
■ Never test for gas leaks with an open flame. Use a
commercially available soap solution made
specifically for the detection of leaks to check all
connections, as specified in the “Make Gas
Connections” section of these instructions.
■ Always install furnace to operate within the furnace’s
intended temperature-rise range with a duct system
which has an external static pressure within the
allowable range, as specified in the “Complete
Installation” section of these instructions. See furnace
rating plate.
■ When a furnace is installed so that supply ducts carry
air circulated by the furnace to areas outside the
space containing the furnace, the return air shall also
be handled by duct(s) sealed to the furnace casing
and terminating outside the space containing the
furnace.
■ A gas-fired furnace for installation in a residential
garage must be installed as specified in the “Location
Requirements” section of these instructions.
■ The furnace is not to be used for temporary heating of
buildings or structures under construction.
■ The furnace shall be installed so the electrical
components are protected from water.
■ Furnaces for indoor installation on combustible
flooring shall not be installed directly on carpeting, tile
or other combustible material other than wood
flooring.
The California Safe Drinking Water and Toxic Enforcement Act requires the Governor of California to publish a list
of substances known to the State of California to cause cancer, birth defects, or other reproductive harm, and
requires businesses to warn of potential exposure to such substances.
WARNING: This product contains a chemical known to the State of California to cause cancer, birth defects, or
other reproductive harm.
This appliance can cause low-level exposure to some of the substances listed, including benzene, formaldehyde,
carbon monoxide, toluene, and soot.
In the State of Massachusetts, the following installation instructions apply:
■ Installations and repairs must be performed by a qualified or licensed contractor, plumber, or gasfitter qualified or
licensed by the State of Massachusetts.
■ If using a ball valve, it shall be a T-handle type.
■ A flexible gas connector, when used, must not exceed 3 feet.

3
INSTALLATION
REQUIREMENTS
These instructions are intended as a general guide only for use by
qualified persons and do not supersede any national or local
codes in any way. Compliance with all local, state, or national
codes pertaining to this type of equipment should be determined
prior to installation.
Read this entire instruction manual, as well as the instructions
supplied in separate equipment, before starting the installation.
The installation of the furnace, wiring, warm air ducts, venting,
etc. must conform to the requirements of the National Fire
Protection Association; the National Fuel Gas Code, ANSI
Z223.1/NFPA No. 54 (latest edition) and the National Electrical
Code, ANSI/NFPA No. 70 (latest edition) in the United States, and
any state laws, local ordinances (including plumbing or
wastewater codes), or local gas utility requirements. Local
authorities having jurisdiction should be consulted before
installation is made. Such applicable regulations or requirements
take precedence over the general instructions in this manual.
This furnace is design certified by CSA International as a
Category I furnace using air from inside the structure for
combustion. The combustion system is fan-assisted, which
means it is equipped with an integral mechanical means to draw
products of combustion through the heat exchanger.
Tools and Parts
Assemble the required tools before starting installation. Read and
follow the instructions provided with any tools listed here.
Tools Needed:
Parts Needed:
Check local codes and with gas supplier. Check existing gas
supply, electrical supply, and venting, and read “Duct Work
Requirements,” “Electrical Requirements,” “Gas Supply
Requirements” and “Venting Requirements” before purchasing
parts.
Location Requirements
IMPORTANT: Do not use the furnace as a heater in a building
under construction. The furnace can be severely damaged due to
the abnormal environment caused by construction. Chlorides
from sources such as paint, stain, or varnish; tile and counter
cements; adhesives; and foam insulation are abundant in a
structure under construction and can be highly corrosive. Low
return air temperature can cause condensation in the furnace and
other damage that can shorten the life of the furnace.
■The furnace is suitable for installation in buildings
constructed on site. The furnace should be centralized in
respect to the heat distribution system as much as
practicable.
■All models are suitable for closet or utility room installation.
Utility room installation requires:
A door opening large enough for the widest part of the
furnace.
A door opening large enough to remove/replace any other
appliance located in the utility room, such as a water heater.
Any other appliances arranged so that each appliance can be
removed/replaced without disturbing the furnace.
■Pipe wrench
■Screwdriver
■Tape measure
■Thread sealant
■Non-corrosive leak check solution
■Test gauge with ¹⁄₈ in. NPT
connection
(for measuring gas supply pressure)
Explosion Hazard
Keep flammable materials and vapors, such as
gasoline, away from furnace.
Place furnace so that burners are at least 18 inches
(46 cm) above the floor for a garage installation.
Failure to follow these instructions can result in death,
explosion, or fire.
Explosion Hazard
Do not install this furnace in a mobile home.
Doing so can result in death, explosion, fire, or
carbon monoxide poisoning.

4
■In a residential garage, a gas-fired furnace must be installed
so the burner(s) and the ignition source are located not less
than 18 in. above the floor. The furnace is to be located or
protected to avoid physical damage by vehicles.
■WFAR, WFLR, WFAT, and WFLT models may be installed as
suspended units in the horizontal position. These furnaces
are not designed for direct attachment of suspension rods to
the furnace casing. See the “Installation Configurations”
section.
■If the furnace is to be installed in an attic or other insulated
space, it must be kept free and clear of insulating materials.
Installation Clearances
■A 2 in. minimum clearance is required in front for air openings
into the combustion chamber.
■All servicing and cleaning of the furnace can be performed
from the front. If installed in a closet or utility room, provide 24
in. clearance in front for service if the door to the room is not
in line with the front of the furnace. Where servicing
clearances are greater than clearances to combustibles,
servicing clearances take precedence.
Minimum Clearance to Combustibles Chart
(all measurements in inches) High Altitude Installations
■This furnace is approved for operation at altitudes from 0 to
4,500 feet above sea level without any required modifications.
■From 4,500 to 7,500 ft, the gas manifold pressure needs to be
adjusted according to the information shown in the Manifold
Pressure vs. Altitude charts.
IMPORTANT:
For installations above 7,500 ft, the furnace input rate is to be
reduced per the requirements of the National Fuel Gas Code
(ANSI Z223.1/NFPA 54, latest edition), at the rate of 4 percent for
each 1,000 feet above sea level.
The furnace is not recommended for installation above 10,000 ft.
Installation Configurations
Models WFAU and WFLU must be installed only as an upflow
furnace. Models WFAT and WFLT may be installed as an upflow
or horizontal furnace. Models WFAR and WFLR may be installed
as either a counterflow or a horizontal furnace.
Models WFAR, WFLR, WFAT and WFLT furnaces can be
horizontally installed for airflow right to left or left to right.
Upflow Installations
WFAU, WFLU, WFAT and WFLT model furnaces can be installed
with either a side or bottom air return. For bottom air return the
bottom air return knockout plate must be removed. For units that
do not include a side or bottom return filter rack, kit no.
AFILT524-1 (side return) or kit no. AFILT529-1 (bottom return) can
be used.
To provide sufficient filter area for installations requiring more
than 1600 CFM nominal air delivery, return air will have to be
brought through both sides of the furnace, or through one side
and the bottom, or an optional filter rack WAFILTHA7 may be
used.
Upflow and Counterflow Installations
Cabinet
Width Front Back Top Vent
Sides
Left Right
14.5 4101 6
2330
17.5 4101 6
2230
21.0 4101 6
200
24.5 4101 6
200
Horizontal Installations
(Models WFAT and WFLT only)
Cabinet
Width Front Back Vent
Airflow
R to L L to R
Top Bottom Top Bottom
14.5 4106
232013 2
17.5 4106
222012 2
21.0 4106
21010
24.5 4106
21010
Horizontal Installations
(Models WFAR and WFLR only)
Cabinet
Width Front Back Vent
Airflow
R to L L to R
Top Bottom Top Bottom
14.5 4106
213 1310
17.5 4106
212 2220
21.0 4106
21010
24.5 4106
21010
1 May be 2" when Type B-1 vent pipe is used.
2 May be 1" when Type B-1 vent pipe is used.
3 Where values greater than 0 are shown, may be 0" when Type
B-1 vent pipe is used.

5
Horizontal Installations
WFAR, WFLR, WFAT and WFLT model furnaces can be
horizontally installed for airflow right to left or left to right. To
ensure access to parts for servicing, install upflow and
counterflow furnaces so that the burner and blower access
panels are readily accessible.
NOTE: When installed horizontally, the installer must install a
sheet metal screw to retain the upper door as shown following, in
either Position 1 or 2, depending on installation configuration.
Horizontal Installation (WFAR and WFLR models)
Horizontal Installation (WFAT and WFLT models)
Horizontal Installation - Suspended
WFAR, WFLR, WFAT and WFLT model furnaces may be installed
as suspended units in the horizontal position. These furnaces are
not designed for direct attachment of suspension rods to the
furnace casing.
■The suspending means must be field fabricated, and should
consist of two “cradles”made by attaching two rods to a
length of angle iron or suitable gauge steel.
■Locate the cradles so that they are as close as possible to the
ends of the furnace (this will provide access for removal of
major components such as the blower assembly).
■Provide enough clearance between the suspension rods and
the furnace to allow removal of access panels.
Installation for Counterflow (Downflow) Models
IMPORTANT:
■The furnace may be installed directly on the supply plenum or
coil cabinet if the furnace is installed on a non-combustible
floor.
■For installations on combustible flooring, a special base must
be ordered and used. See the “Accessories”section.
1. Cut, size and frame opening in floor to fit the Combustible
floor base and provide a minimum 1in. clearance between the
Supply Duct and combustible materials. The 4 legs on the
base assembly should recess into the floor, and the base
should rest on all 4 outside flanges.
2. Construct duct connections with 1in. to 1³⁄₄ in. right angle
flanges, and long enough to extend below the floor joists.
3. Drop the duct connections through the top of the base
assembly with the right angle flanges in good contact with
the glass tape on top of the base assembly.
4. Carefully position the furnace over the right angle duct
flanges.
1. Screw placement for Left to Right airflow
2. Screw placement for Right to Left airflow
1. Screw placement for Right to Left airflow
2. Screw placement for Left to Right airflow
Return
Supply
1
2
Return
Supply
1
2
WARNING
Fire Hazard
Before installing counterflow (downflow) furnace on
combustible surface, such as wood, install one of the
following kits:
WABASE 511 (14.5" cabinets)
WABASE 512 (17.5" cabinets)
WABASE 568 (21" cabinets)
WABASE 569 (24.5" cabinets)
Contact your local dealer.
Failure to do so can result in death or fire.

6
Combustible Floor Installation (Counterflow Models only)
Duct Work Requirements
Install the conditioned air plenum, ducts and air filters (if not
provided on the furnace) in accordance with NFPA 90B Standard
for the Installation of Warm Air Heating and Air-Conditioning
Systems (latest edition).
The furnace is provided with flanges for the connection of the
plenum and ducts.
All air filters must be listed as Class 2 furnace air filters.
Electrical Requirements
■The furnace must be grounded and wired in accordance with
local codes or, in the absence of local codes, with the
National Electrical Code ANSI/NFPA No. 70 (latest edition).
■In all instances, other than wiring for the thermostat, the
wiring to be done and any replacement of wire shall conform
with the temperature limitation for Type T wire –63°F (35°C)
rise.
■The line voltage supply should be routed through a readily
accessible disconnect located within sight of the furnace. A
junction box on the furnace side panel is provided for line
voltage connections. See the furnace wiring diagram for
specific connection information.
■Proper polarity of the supply connections (“HOT”and
“NEUTRAL”) must be observed to ensure that safety controls
provide the protection intended.
Gas Supply Requirements
This furnace is equipped for use with natural gas. A conversion
kit is required for use with propane. To order the correct
conversion kit, see “Accessories.”
■Gas supply piping should be installed in accordance with
local codes and the regulations of the utility. Piping must be
of adequate size to prevent undue pressure drop. Consult the
local utility or gas supplier for complete details on special
requirements for sizing gas piping.
■If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not use a
connector which has previously serviced another gas
appliance.
Venting Requirements
Adequate provisions for combustion air and ventilation of furnace
must be made. Refer to Section 5.3, “Air for Combustion and
Ventilation,”of the National Fuel Gas Code, ANSI Z223.1/NFPA54
(latest edition), or applicable provisions of the local building
codes. For Category 1 furnaces, vent installations shall be in
accordance with parts 7 and 11 of the National Fuel Gas Code,
ANSI Z223.1/NFPA 54, the local building codes, and the furnace
and vent manufacturer’s instructions.
Unconfined Space
An unconfined space is defined as “a space whose volume is
more than 50 cu ft per 1000 BTU per hour of the combined input
rating of all appliances installed in that space.”
When a furnace is installed in an unconfined space in a building,
it can be assumed that the infiltration will be sufficient to supply
the required air.
If the furnace is installed in a ventilated attic or crawl space, it is
assumed that the air infiltration is sufficient to supply the required
combustion air. However, in a building of unusually tight
construction, additional outdoor air should be provided.
Confined Space
A confined space is defined as “a space whose volume is less
than 50 cu ft per 1000 BTU per hour of the combined input rating
of all appliances installed in that space.”
Confined Space Installation/Air from Inside Structure
If the furnace is installed in a confined space within the building
and combustion air is taken from a heated space, the
combustion air and ventilating air must enter and leave the space
through two permanent openings of equal area. One opening
shall be located within 12 in. of the ceiling and the other within 12
in. of the floor.
NOTE: Each opening must have a free area of at least 1 square
inch per 1000 BTU/HR of total input rating of all equipment in the
enclosure, and not less than 100 square inches each.
1. Furnace
2. Woven glass tape (between
flanges of outlet duct and
base assembly)
3. Base assembly
4. Combustible flooring
5. Leg
6. Supply plenum or coil cabinet
(not provided - accessory)
3
5
6
2
1
4
WARNING
Electrical Shock Hazard
Electrically ground furnace.
Connect ground wire to green ground screw.
Failure to do so can result in death or electrical shock.

7
Equipment in Confined Space (All Air from Inside)
Confined Space Installation/Air from Outside Structure
If air from outside is brought in for combustion, the confined
space shall be provided with two permanent openings. One
opening shall be within 12 in. of the ceiling and one opening
within 12 in. of the floor. Several methods can be used to bring
the outside air in through these openings. The openings must
open directly or by ducts to the outdoors, through spaces (crawl
space or attic) that freely open to the outdoors, or indirectly
through vertical ducts.
NOTE: If any of these methods are used, the inlet and outlet air
openings must each have a free area of 1 square inch per 4000
BTU per hour of the total input rating of all equipment within the
enclosure.
Equipment in Confined Space - All Air from Outside
(Inlet air from crawl space and outlet air to ventilated attic)
Equipment in Confined Space - All Air from Outside
(All air through ventilated attic)
Equipment in Confined Space - All Air from Outside
(All Air from Horizontal Ducts)
NOTE: Another option is to use horizontal combustion ducts. If
horizontal combustion ducts are run, 1 square inch per 2000
BTU/HR of the total input rating of all equipment in the enclosure
is required. If the equipment room is located against an outside
wall and the air openings communicate directly with the
outdoors, each opening shall have a free area of at least one
square in. per 4000 BTU/HR of the total input rating of all other
equipment in the enclosure.
Contaminated Combustion Air
Excessive exposure to contaminated combustion air will result in
performance-related problems. The recommended source of
combustion air is outdoor air.
Outdoor air as the source of combustion air
If the furnace is installed in a confined space, it is recommended
that the necessary combustion air come from the outdoors by
way of an attic, crawl space, air duct, or direct opening.
Outdoor air is required as the source of combustion air when the
indoor air is contaminated with chemical substances and in the
following types of installations:
■Furnaces installed in commercial buildings
■Furnaces installed in buildings with indoor pools
■Furnaces installed in hobby or craft rooms
■Furnaces installed near chemical storage areas
■Furnaces installed in laundry rooms
■Furnaces installed in hair salons
1. Chimney or gas vent
2. Furnace
3. Water heater
4. Openings
1. Chimney or gas vent
2. Furnace
3. Ventilation louvers
(for unheated crawl space)
4. Ventilation louvers
(each end of attic)
5. Outlet air
6. Water heater
7. Inlet air
1
2
4
3
1
22
3
5
4
6
7
1. Chimney or gas vent
2. Furnace
3. Ventilation louvers
(Each end of attic)
4. Outlet air
5. Inlet air (Ends 12“ above bottom)
6. Water heater
1. Chimney or gas vent
2. Furnace
3. Outlet air
4. Water heater
5. Inlet air
1
4
2
3
5
6
1
2
3
4
5

8
Indoor air as the source of combustion air
Indoor air as the source of combustion air is acceptable in most
applications if the following guidelines are met:
■All provisions for indoor combustion air must meet the
requirements for combustion air indicated in the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 (latest edition), and/or any
applicable local codes.
■If indoor combustion air is used, the air supply to the furnace
should not be exposed to the following substances:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine-based swimming pool chemicals
Water softening chemicals
Deicing salts or chemicals
Carbon tetrachloride
Halogen-type refrigerants
Cleaning solvents (such as perchloroethylene)
Printing inks, paint removers, varnishes, etc.
Cements and glues
Antistatic fabric softeners for clothes dryers
Masonry acid washing materials
Chlorinated laundry products
Hydrochloric acid
INSTALLATION
INSTRUCTIONS
Inspect Shipment
This furnace is shipped in one package, completely assembled
and wired. The thermostat is shipped in a separate carton when
ordered.
■Check the unit rating plate to confirm specifications are as
ordered.
■Upon receipt of equipment, carefully inspect it for possible
shipping damage. Take special care to examine the unit
inside the carton if the carton is damaged.
■If damage is found, it should be noted on the carrier’s freight
bill. Damage claims should be filed with the carrier
immediately. Claims of shortages should be filed with the
seller within 5 days.
NOTE: If any damages are discovered and reported to the
carrier, do not install the unit as your claim may be denied.
Plan Vent System
Vertical Venting
Category I furnaces must be vented vertically or nearly vertically.
Common venting and multistory venting are permitted when
done in accordance with applicable codes, such as local and
national codes.
The venting system should be designed in accordance with the
“FAN”columns in the venting tables in the latest editions of the
National Fuel Gas Code, ANSI Z223.1/ NFPA 54.
■Consult local building codes for installation requirements.
■The vent connector should be as short as possible with the
least number of elbows and angles to do the job.
■It is recommended that a minimum of 26 gauge galvanized
flue pipe be used. Use of single-wall vent pipe for the vent
connector is permissible only in conditioned space. The vent
material used should be in accordance with the National Fuel
Gas Code, ANSI Z223.1/ NFPA 54 (latest edition) and local
codes. Fan-assisted combustion system Category I furnaces
shall not be vented into single wall metal vents.
NOTE: Use Doublewall Type B vent pipe through
unconditioned space such as attics and crawl spaces.
■The vent connector must have an upward slope toward the
chimney on all horizontal runs of at least ¹⁄₄ in. per foot of
horizontal run and should be supported by a sheet metal
strap. The vent pipe connection must be secured to the
induced draft blower outlet.
■A factory-built chimney must extend 3 ft above the highest
point where it passes through a roof of a building and at least
2 ft higher than any portion of a building within a horizontal
distance of 10 ft as shown.
Explosion Hazard
Furnace must be installed and serviced by a
qualified person.
Examples of a qualified person include:
licensed heating personnel,
authorized gas company personnel.
Read and follow all instructions provided for
installation, adjustment, service, alteration, or
maintenance.
Failure to follow these instructions can result in death,
explosion, fire, or carbon monoxide poisoning.
Excessive Weight Hazard
Use two or more people to move and install furnace.
WARNING
Failure to do so can result in back or other injury.

9
Vent Option - Vent Through Roof
■All vents passing through floors, ceilings, and walls must be
fire stopped according to the requirements of the National
Fuel Gas Code. See “Vent Options.”
Vent Option - Vent Through Ceiling
Vent Option - Vent Through Floor
Sidewall Venting
This furnace can be sidewall (horizontally) vented with a listed
sidewall venter such as Field Controls Model SWG-4HD with CK-
43 Control Kit, or Tjernlund Model GPAK-JT. See the Sidewall
Venter Limitations Chart following.
Category I venting classification is maintained when vented in
this manner. The furnace, power venter and control kit (where
applicable) must be installed in accordance with their installation
instructions and all applicable codes.
For horizontal runs of vent pipe, supports are required at 5 ft
intervals.
Sidewall Venter Limitations Chart
Vent Through Wall
Chimney Options
The furnace must be connected to a factory-built chimney or vent
complying with a recognized standard, or a masonry or concrete
chimney lined with a lining material acceptable to the authority
with jurisdiction.
NOTE: Venting into an unlined masonry chimney or a single wall
metal vent is prohibited in all cases. A lined masonry chimney
may be used.
Lined (Masonry) Chimney Venting
1. Ridge
1. 26 Gauge galvanized firestop on top of framed opening
2. Flue pipe
3. 1 in. Clearance between flue pipe and frame
1. Pipe collar (Firestop)
2. Flue pipe
3. Floor
Less Than
10 Ft.(3048 mm)
2 Ft. (610 mm)
Min.
3 Ft.
(914 mm)
Min.
1
1
2
3
1”1”
1
2
3
Vent pipe diameter 4 in.
Minimum vent pipe length 4 ft
Maximum vent pipe length 25 ft *
Maximum number of 90°elbows 4
* When fewer than 4 elbows are used, maximum vent pipe
length can be increased by 5 ft per unused elbow.
1. Thimble
2. Flue pipe
3. Combustible wall
1. Cleanout
2. Liner
3. (Lined) Masonry chimney
1
2
3
1
2
3

10
Factory-Built Chimney Venting
NOTE: All vent pipe run outside shall be constructed of
factory-built chimney sections.
■Extend the vent connector into the chimney so that it is flush
with the inside of the flue liner. Seal the joint between the pipe
and the liner.
■Masonry chimneys serving fireplaces cannot be used for
venting purposes unless the fireplace opening is permanently
sealed.
■A vent connector serving this appliance must not be
connected into any portion of mechanical draft systems
operating under positive pressure.
■The vent pipe must not be connected to a chimney flue
serving a solid fuel appliance.
■A manual damper, barometric draft regulator, or flue restrictor
must not be installed between the furnace and the chimney.
■Where local experience indicates that condensate may be a
problem, the vent shall be constructed to prevent
condensation from entering the combustion blower. Provision
shall be made to drain off the condensate.
■All unused chimney openings should be closed.
■Multistory venting is allowed as permitted by the National
Fuel Gas Code or local codes.
■Install all vents in accordance with the vent manufacturer’s
instructions. For unlisted material, install in accordance with
the National Fuel Gas Code.
■Vent terminals must be installed in accordance with the vent
terminals listing or in accordance with the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 (latest edition), and local codes.
Existing Venting Systems
When an existing furnace is removed or replaced, the original
venting system may no longer be sized to properly vent the
attached appliances. An improperly sized venting system can
result in spillage of flue products into the living space, the
formation of condensate, leakage, etc. See the “Carbon
Monoxide Poisoning Hazard”for proper test procedure.
1. Factory built chimney
2. Cleanout
1
2
WARNING:
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon monoxide
poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into operation,
while all other appliances connected to the venting system are
not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and horizontal
pitch, as required in the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 or the CSA B149.1, Natural Gas and
Propane Installation Codes and these instructions.
Determine that there is no blockage or restriction, leakage,
corrosion and other deficiencies which could cause an
unsafe condition.
3. As far as practical, close all building doors and windows
and all doors between the space in which the appliance(s)
connected to the venting system are located and other
spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connected to
the venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they are operating
at maximum speed. Do not operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance being
inspected into operation. Adjust the thermostat so
appliance is operating continuously.
7. Test for spillage from draft hood equipped appliances at the
draft hood relief opening after 5 minutes of main burner
operation. Use the flame of a match or candle.
8. If improper venting is observed during any of the above
tests, the venting system must be corrected in accordance
with the National Fuel Gas Code, ANSI Z223.1/NFPA 54
and/or CSA B149.1, Natural Gas and Propane Installation
Codes.
9. After it has been determined that each appliance connected
to the venting system properly vents when tested as
outlined above, return doors, windows, exhaust fans,
fireplace dampers and any other gas-fired burning
appliance to their previous conditions of use.

11
Connect Venting
1. Using a ¹⁄₄ in. sheet metal screw, secure the vent pipe to the
inducer blower outlet.
2. Make sure all vent connections do not leak.
3. Check that the venting is open, and that it is the correct size.
4. Check that the vent pipe terminates outside the building.
Install Duct Work
IMPORTANT:
■Install duct work in accordance with NFPA 90B and any local
codes.
■If there is no complete return air duct system, the return air
connection must be sealed to the furnace casing and run full
size to a location outside the utility room or space housing
the furnace to prevent a negative pressure on the venting
system.
Installation with Return Ducts
A return air duct system is recommended. If the unit is installed in
a confined space or closet, a return connection must be run, full
size, to a location outside the closet. The air duct in the closet
must be tight to prevent any entrance of air from the closet into
the circulating air.
Installation with an Evaporator Coil
When a condensing unit is used in conjunction with the furnace,
the evaporator coil must be installed in the discharge (supply) air.
Do not install an evaporator coil in the return air; excessive
condensation will occur within the furnace.
When installing a WME coil in a horizontal position with a
horizontal gas furnace, always keep the open end of the A-coil
facing the supply air outlet of the furnace (blow into the open end
of the A-coil). The A-coil should point away from the supply air
outlet of the furnace as shown.
Installation without an Evaporator Coil
If a cooling coil is not installed with the furnace, then a removable
access panel should be provided in the supply plenum for
purposes of inspecting the heat exchanger. This opening must be
accessible when the furnace is installed. It must be large enough
that the heat exchanger can be viewed for possible openings
using light assistance or so that a probe can be inserted for
sampling the airstream. The cover for the opening must be leak
tight.
Filter Specifications
Filters are not supplied with these furnaces. It is the furnace
installer’s responsibility to install properly sized filters in
accordance with the Minimum Filter Requirements chart.
■The Airflow Descriptor is the 2 digits immediately preceding
the hyphen (-) in the furnace model number. Example: 16 is
the Airflow Descriptor for furnace model WFAT075B16-1A.
The model number is located on the rating plate inside the
access panel.
■Areas and dimensions shown for cleanable filters are based
on filters rated at 600 ft per minute face velocity.
■Typical filter sizes are shown; however, any combination of
filters whose area equals or exceeds the minimum area
shown is satisfactory.
If a central return air filter-grille is used, the furnace does not
require a filter.
To install a filter at the furnace only, use the following kits:
■AFILT524 for side return on upflow installations.
■AFILT529 for bottom return on upflow furnace installations.
■WAFILTHA7 for single side return in installations requiring
more than 1600 CFM nominal air delivery.
Return
Supply
Minimum Filter Requirements Chart
Airflow
Descriptor
Disposable Filters Cleanable Filters
Min.Area
(sq. in.) Size (in.) Qty. Min.Area (sq. in.) Size (in.) Qty.
09 480 20 x 25 1 240 16 x 20 1
10 480 20 x 25 1 240 16 x 20 1
12 576 16 x 20 2 288 16 x 20 1
14 672 20 x 20 2 336 20 x 20 1
16 768 20 x 20 2 384 20 x 20 1
20, 22 960 20 x 25 2 480 20 x 25 1

12
Make Electrical Connections
Thermostat
Install a room thermostat according to the instructions furnished
with it. Select a location on an inside wall that is not subject to
drafts, direct sunshine, or other heat sources.
Make the low voltage thermostat connections to the blower
control board as indicated on the Wiring Connection Diagram.
Continuous Low Speed Blower
If continuous blower operation on low speed is desired, connect
the low speed motor tap to the CONT (constant) air terminal on
the blower control board. See the Wiring Connection Diagram.
The blower will operate on low speed whenever the main power
is connected to the furnace, except when it operates on heating
or cooling speed during thermostat call for heat or cooling.
NOTE: The constant air terminal is to be connected to the low
speed motor tap only. If a motor is wired for a higher speed, the
increased amp draw could cause the board control to fail and
void the warranty.
1. Disconnect power.
2. Remove the screw from the furnace electrical connection
box.
3. Remove the cover from the furnace electrical connection box.
4. Route the field supply wires to the furnace electrical
connection box.
5. Using UL listed wire nuts, connect the field supply wires to
the furnace (black to black and white to white).
6. Connect ground wire to green ground screw.
7. Replace the furnace electrical connection box cover and
screw.
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.
1. Connect white to white and black to black
2. Green ground screw
WARNING
Electrical Shock Hazard
Electrically ground furnace.
Connect ground wire to green ground screw.
Failure to do so can result in death or electrical shock.
1
2

13
Make Gas Connections
IMPORTANT: This furnace requires conversion for use with
propane. To order the correct conversion kit, see “Accessories.”
1. Install the field gas supply as shown.
2. Provide a sediment trap on the outside of the furnace.
3. Install a manual gas shutoff valve in the gas line, outside the
unit, 5 ft above the floor, or in accordance with any local
codes.
4. Install a test gauge connection with a ¹⁄₈ in. NPT plugged
tapping immediately upstream of the shutoff valve as shown.
5. Connect the gas pipe to the furnace controls providing a
ground joint union as close to the controls as possible to
facilitate removal of controls and manifold.
Pipe-joint compounds suitable for use with natural and LP
gas must be used. Do not use Teflon®tape.
6. Turn off the gas supply at the manual gas shutoff valve.
7. Remove the inlet pressure tap plug on the gas control valve
and connect pressure gauge to the ¹⁄₈ in. NPT inlet
pressure tap.
8. Turn on the gas supply at the manual gas shutoff valve.
9. Observe the inlet pressure.
The minimum inlet gas supply pressure is 5 in. W.C. for
natural gas and 11 in. W.C. for propane gas.
The maximum inlet gas supply pressure is 10.5 in. W.C. for
natural gas and 13 in. W.C. for propane gas.
10. Turn off the gas supply at the manual gas shutoff valve.
IMPORTANT: If the inlet gas supply pressure is not within the
minimum and maximum range as shown on the rating plate,
contact your gas supplier.
11. Disconnect the pressure gauge from the ¹⁄₈ in. NPT inlet
pressure tap.
12. Replace the inlet pressure tap plug on the gas control valve.
13. Turn on the gas supply at the manual gas shutoff valve.
14. Test all connections by brushing on an approved non-
corrosive leak-detection solution. Bubbles will show a leak.
Correct any leak found.
■At test pressures greater than ¹⁄₂ psig (3.5 kPa), the
furnace and the manual gas shutoff valve must be
disconnected from the gas supply piping system.
■At test pressures less than or equal to ¹⁄₂ psig (3.5 kPa),
the furnace must be isolated from the gas supply piping
system by closing the manual gas shutoff valve.
15. Replace the burner access door.
Check the Furnace Input Rate
(if required)
IMPORTANT:
■The furnace input rate must not exceed the input rating on
the furnace rating plate.
■At altitudes from 2,000 to 7,500 ft the furnace input rate must
not exceed that on the rating plate multiplied by the Input
Factor in the Manifold Pressure vs. Altitude chart.
■This furnace is equipped for rated input at manifold pressures
of 3.5 in. W.C. for natural gas and 10.0 in. W.C. for propane
gas.
1. For natural gas, check the furnace rate by observing the gas
meter, making sure all other gas appliances are turned off.
The test hand on the meter should be timed for at least one
revolution.
2. The actual heating value of your gas can be obtained from
your local utility company.
1. ¹⁄₈ in. NPT plugged tapping
2. Manual gas shutoff valve
3. Union
4. Tee
5. Sediment trap
6. Cap
7. Gas control valve
(inside furnace)
1. Closed valve
2. Open valve
®Teflon is a registered trademark of E.I. Dupont de Nemours and
Company.
2
3
4
5
6
6
7
1
WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.
BTU/HR
INPUT = Cubic feet per Revolution x 3600 x Heating Value
# Seconds per Revolution

14
Adjust the Furnace Input Rate
(if required)
For altitudes 4,500 to 7,500 feet above sea level.
1. Remove the burner access door.
2. Move the gas control switch to the OFF position. Use only
your hand to move the gas control switch; tools are not
required.
3. Remove the outlet pressure tap plug on the gas control valve
and connect pressure gauge to the ¹⁄₈ in. NPT outlet pressure
tap.
Gas Control Valve
4. Be sure the gas control switch has been in the OFF position
for at least 5 minutes before starting the unit.
5. Move the gas control switch to the ON position.
NOTE: This furnace is equipped with an ignition device which
automatically lights the burner. This furnace cannot be lighted
manually. Do not try to light the burner by hand.
6. Turn on the electrical power to the furnace.
7. Set the room thermostat to a point above room temperature
to light the main burners.
8. Observe the pressure reading on the pressure gauge.
9. Refer to the Manifold Pressure vs. Altitude chart for the
correct manifold pressure. If necessary, remove the regulator
adjusting cap on the gas valve and turn the regulator
adjusting screw clockwise to increase pressure and input, or
counterclockwise to decrease pressure and input.
IMPORTANT: If the manifold pressure cannot be adjusted to
the correct value, contact your gas supplier.
10. Move the gas control switch to the OFF position.
11. Disconnect the pressure gauge from the ¹⁄₈ in. NPT outlet
pressure tap.
12. Replace outlet pressure tap plug and the regulator adjusting
cap on the gas valve.
13. Move the gas control switch to the ON position.
14. Replace the burner access door.
15. Set the room thermostat to the desired temperature
necessary to achieve optimum temperature rise.
Manifold Pressure vs. Altitude Chart (Most Models)
Manifold Pressure vs. Altitude Chart
(Model WFAU 150 only)
For Altitudes 7,500 to 10,000 feet above sea level.
Do not adjust manifold pressure. An orifice change is required.
For the correct orifice size, see Table F.4 in Appendix F of the
National Fuel Gas Code (ANSI Z223.1/NFPA 54, latest edition).
1. ¹⁄₈ ”NPT Inlet pressure tap
2. Regulator adjusting cap
3. Diagnostic LED
4.
¹⁄₈ ”NPT Outlet pressure tap
5. Gas control switch
ON OFF
C1 C2
C3
1/2" NPT Inlet 1/2" NPT Outlet
2
1
3
4
5
Natural Gas
Altitude (ft) Heating Value
(BTU/ft3)Manifold
Pressure (in.
W.C.)
Input
Factor
2000 948 3.50 0.9666
3000 914 3.50 0.9499
4000 881 3.50 0.9332
4500 865 3.50 0.9249
5000 849 3.29 0.8900
5500 833 3.27 0.8790
6000 818 3.25 0.8680
6500 802 3.23 0.8570
7000 787 3.21 0.8460
7500 771 3.19 0.8350
Natural Gas
Altitude (ft) Heating Value
(BTU/ft3)Manifold
Pressure
(in. W.C.)
Input
Factor
2000 948 3.41 0.9666
3000 914 3.41 0.9499
4000 881 3.41 0.9332
4500 865 3.41 0.9249
5000 849 3.20 0.8900
5500 833 3.18 0.8790
6000 818 3.16 0.8680
6500 802 3.14 0.8570
7000 787 3.12 0.8460
7500 771 3.11 0.8350

15
Complete Installation
IMPORTANT: Do not use this furnace if any part has been under
water. Immediately call a qualified person to inspect the furnace
and to replace any part of the control system and gas control
which has been under water.
1. Check to be sure you have all of your tools.
2. Dispose of all packaging materials.
3. Check the furnace in its final location. Be sure the vent is not
blocked.
Measure Temperature Rise
1. After 20 minutes of heating operation, measure the furnace
temperature rise. Take air temperature readings in both the
return air ducts and the heated air ducts (about 6 ft from the
furnace where they will not be affected by radiant heat) as
shown.
NOTE: If more than one run of return or heated air ducts is
used, air temperature measurements should be taken in each
duct. These measurements can be converted to an average
to obtain the temperature rise of the whole system.
2. If furnace doesn't maintain temperature rise within the range
shown on the furnace rating plate, adjust the blower speed.
Adjust Blower Speed
NOTE: See the Wiring Connection Diagram while performing the
following procedure.
1. Disconnect power.
2. For heating speed, check the temperature rise and make the
necessary adjustments to the blower speed tap. See Wiring
Diagram.
3. Reconnect power.
4. Recheck the temperature rise. Repeat the procedure as
necessary to achieve optimum temperature rise.
Shut Down the Furnace
1. Set the room thermostat to the lowest setting.
2. Disconnect power.
3. Remove burner access door.
4. Shut off the gas by moving the gas control switch to the OFF
position.
5. Replace the burner access door.
1. Measure return air here.
2. Measure supply temperature here.
Warm Air
Return Air
1
2
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

16
Sequence of Operation
Heating
A call for heat from the thermostat closes R to W on the blower
control board, which begins the ignition sequence. The induced
draft blower output energizes. The pressure switch senses
normal combustion airflow, and closes. After a 15-second pre-
purge, the control energizes the hot surface igniter. After an
igniter warm-up period, the main gas valve energizes. Upon main
burner ignition, the circulating air blower energizes following a
30-second delay.
When the call for heat is satisfied, R to W opens and the gas to
the burners shuts off. The control turns off the inducer after a 5-
second post-purge delay and the heating speed blower output
turns off following the blower “off”delay.
NOTE: There is a fixed blower “off”delay of 90 seconds which is
one-time adjustable to 150 seconds. See the Wiring Connection
Diagram in the “Troubleshooting”section.
In the event the limit control senses an abnormally high
temperature and opens, the ignition control de-energizes, and the
combustion blower and circulating air blower heating speed
continue to energize.
Fan On
A call for fan from the thermostat closes R to G on the control
board. The control waits for a 1-second thermostat debounce
delay before responding by energizing the heat speed blower.
When the call for fan is turned off, the control de-energizes the
heating speed blower after a 60-second delay.
Cooling
A call for cooling from the thermostat closes R to Y and R to G on
the blower control board. The control waits for a 1-second
thermostat debounce delay before energizing the cool speed
blower. When the call for cooling is satisfied, the control
de-energizes the cooling speed blower after a 60-second delay.
Controls
Pressure Switch
The pressure switch is a normally open switch that monitors
combustion airflow. If there is adequate airflow, the pressure
switch closes. Inadequate airflow resulting from excessive
venting system restriction or a failed combustion blower will
cause the switch to remain open.
Rollout Switch(es)
The rollout switch(es) are normally closed switch(es) that open
when abnormal temperatures exist in the burner area. This can
be caused by a restricted heat exchanger causing main burner
flame to “roll out”into the vestibule area or burner box.
The rollout switch(es) must be manually reset by pushing the
button on top to restore furnace operation.
Primary Limit Control
This is a normally closed control that opens if abnormally high
circulating air temperatures occur. It is an automatic reset control.
Safety Interlock Switch
When the blower door is removed, the safety interlock switch
breaks the power supply to the burner controls and blower motor.
Blower Control Board
The blower control board operates the circulating air blower, the
combustion blower and any accessories connected to it. There is
a fixed blower “off”delay of 90 seconds, which is one-time
adjustable to 150 seconds. See Wiring Connection Diagram.
Gas Control Valve
The gas control valve contains control logic to sense proper
operating conditions and provides gas flow and ignition only
when all conditions are properly met. The gas control valve also
regulates the manifold gas pressure.
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

17
TROUBLESHOOTING
Furnace Fails to Operate Properly
Review “Sequence of Operation”and visually inspect the
following before troubleshooting:
Is the power to the furnace on?
Is the blower compartment door securely closed?
Are the manual shutoff valves in the gas line to the furnace open?
Failure Codes
The system has a built-in, self-diagnostic capability. The control
continuously monitors its own operation and the operation of the
system. If a system problem occurs, a failure code is indicated by
the LED on the gas control valve. See the Failure Codes chart for
a description of the flash codes.
IMPORTANT: Do not remove the blower compartment door or
turn off the power to the furnace because either action will clear
the control’s memory of the failure.
1. Start the system by setting the thermostat above the room
temperature.
2. Observe the system’s response.
3. Use the information provided in this section to check the
system’s operation.
Failure Codes
LED Status
(Flash Codes) Fault Description
Off No Power to the System Control
Steady Flash* Normal Operation (Standby or call for heat)
2 Flashes Pressure switch closed when it should be
open
3 Flashes
Pressure switch stuck open 30 seconds or
longer after call for heat (system in 5-minute
delay mode before next call for heat). On/off
switch in OFF position during a call for heat
will generate this code.
4 Flashes Open Limit Switch or Limit Switch Circuit
5 Flashes Flame Sense Signal sensed out of proper
sequence
* 11 or more flashes with no pause

18
Wiring Connection Diagram - Honeywell®SmartValve II®Ignition System
Check codes for proper wiring and circuit protection before
installation.
NOTES:
1. If any of the original wire as supplied with the furnace must be
replaced, it must be replaced with wiring material having a
temperature rating of at least 90°C.
2. Not used on all models
3. For a fixed blower off delay of 90 seconds see “Blower
Control Board”section. Jumper can be cut for a 150 second
off delay.
INDUCED
DRAFT
BLOWER
INTERLOCK
SWITCH
CIRCULATION
BLOWER
CONDENSER
THERMOSTAT & SUB-BASE
HEAT ANTICIPATOR
.75 AMP
LINE VOLTAGE - FACTORY
LINE VOLTAGE - FIELD
LOW VOLTAGE - FACTORY
LOW VOLTAGE - FIELD
HONEYWELL
DELAY OFF SWITCH SETTINGS
60 SEC 90 SEC 120 SEC 150 SEC
SEE NOTE 2
FIG. 1
SEE NOTE 3
JUMPER
RCWYG
BLOWER
CONTROL
TWIN
24VAC
M1
HUM
COM
NEUTRAL CONT COOL
M2
HEAT EAC
SEE NOTE 2
12
41
52
63
BLK
ORG
BLU
RED
HUM
EAC
SEE NOTE 2
WHT (NEUT)
RED (LO)
ORN (MED/LO)
BLU (MED)
TRANSFORMER
YEL
YEL
WHT
WHT
WHT
WHT
BLK
BLK
120/1/60
FLAME
SENSOR
HOT SURFACE
IGNITER
S2
P2
SMARTVALVE
IGNITION
CONTROL
YEL YEL
C3
C2
BLK
43
12 432 1
BLU
RED ORG
51
26
73
48
C1
S1
P1
BLK/WHT
VLT
VLT
BRN
BRN
ROLLOUT
SWITCH
PRESSURE
SWITCH
AUX
LIMIT
AUX
(IF USED)
ROLLOUT
SWITCH
WHT
WHTWHT
VLT
HIGH
LIMIT
WHT/BLK
GRN
WHT
GRY
WHT
12 212121
YEL (MED/HI)
NOT USED ON ALL MODELS
*
(IF USED)
LIMIT (IF USED)
BLK (HIGH)
*
or
BLU
WARNING
Electrical Shock Hazard
Disconnect power before servicing.
Replace all parts and panels before operating.
Failure to do so can result in death or electrical shock.

19
Wiring Schematic - Honeywell®SmartValve II®Ignition System
ROLLOUT
SWITCH
AUX
LIMIT
4
3
2
DATA
C
R
C3
C2
C1
FLAME
SENSOR
1
432178123456
SMARTVALVE II
IGNITION CONTROL
563421
NEUTRALS
NEUTRALS
NEUTRALS
120 VAC
N
NEUTRALS
CIRCULATION
FAN
HI
LOW
MED
M1
EAC(S)
CONSTANT
HEAT
COOL
HUM
K2
K2
K1
K1
AIR
CLEANER
HUMIDIFIER
CONDENSER
BLOWER CONTROL CENTER
PRESSURE
SWITCH
HIGH
LIMIT
ROLLOUT
SWITCH
G
Y
W
C
R
T’STAT
24 VAC
INDUCED
DRAFT
BLOWER
INTERLOCK
SWITCH
N
H
TRANSFORMER
IGNITER
IGNITION
CONTROL
(IF USED)
(IF USED)
(IF USED)
AUX
LIMIT
(IF USED)
(IF USED)
SMVII
(120 VAC)
(24 VAC)

ASSISTANCE OR SERVICE
If you need further assistance, you can write to the below
address with any questions or concerns:
Whirlpool®Home Cooling and Heating
7901 S.W. 6th Court
Plantation, Florida 33324
Please include a daytime phone number in your correspondence.
Accessories
To order accessories ask for the appropriate part number listed
below or contact your Whirlpool®Home Cooling and Heating
dealer.
ALPKT572-2 Natural Gas to Propane Conversion Kit
WAFILTHA7-2 Filter Frame Kit
AFILT524-1 Side Return Filter Kit
AFILT529-1 Bottom Return Filter Kit
WABASE511 Combustible Floor Base (14.5" cabinets)
WABASE512 Combustible Floor Base (17.5" cabinets)
WABASE568 Combustible Floor Base (21.0" cabinets)
WABASE569 Combustible Floor Base (24.5" cabinets)
46924D003
© 2003. All rights reserved.
Honeywell and SmartValve are trademarks of Honeywell International, Inc.
®/TM Whirlpool and all other trademarks are owned by Whirlpool, U.S.A.,
used under license by Tradewinds Distributing Company, LLC. 4/03 Printed in U.S.A.