Whirlpool WFAU, WFAR, WFAT, WFLU, WFLR Installation Instructions

80% GAS FURNACE INSTALLATION INSTRUCTIONS

Table of Contents

GAS FURNACE SAFETY................................................................1

INSTALLATION REQUIREMENTS................................................3

Tools and Parts ............................................................................3

Location Requirements................................................................ 4

Installation Configurations ...........................................................5

Ductwork Requirements ..............................................................7

Electrical Requirements ...............................................................7

Gas Supply Requirements...........................................................7

Venting Requirements..................................................................7

INSTALLATION INSTRUCTIONS..................................................9

Inspect Shipment.........................................................................9

Plan Vent System.........................................................................9

Determine Vent Pipe Direction...................................................12

Connect Venting.........................................................................14

Install Duct Work........................................................................14

GAS FURNACE SAFETY

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.

Filter Specifications....................................................................14

Make Electrical Connections .....................................................15

Make Gas Connections..............................................................16

Check the Furnace Input Rate (if required)................................17

Adjust the Furnace Input Rate (if required) ................................17

Complete Installation..................................................................18

Shut Down..................................................................................19

SEQUENCE OF OPERATION ......................................................19

Heating .......................................................................................19

Fan On........................................................................................19

Cooling .......................................................................................20

CONTROLS ...................................................................................20

TROUBLESHOOTING ..................................................................21

ASSISTANCE OR SERVICE.........................................................24

Accessories ................................................................................24

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:

You can be killed or seriously injured if you don't immediately

DANGER

WARNING

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.

Whirlpool® Models
WFAU, WFAR, WFAT,
WFLU, WFLR, WFLT

46924B008

Whirlpool® Home Cooling and Heating

follow instructions.

can be killed or seriously injured if you don't

You
instructions.

14610 Breakers Drive

Jacksonville, FL 32258

follow

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.

Adequate clearance must be provided around the

■

vent-air intake terminals.

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.

SAVE THESE INSTRUCTIONS

WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in serious injury, death or property

damage.

— Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or

any other appliance.

— WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any phone in your building.

• Leave the building immediately.

• Immediately call your gas supplier from a neighbor’s phone. Follow the gas supplier’s
instructions.

• If you cannot reach your gas supplier, call the fire department.

— Installation and service must be performed by a qualified installer, service agency or the gas

supplier.

2

WARNING: Gas leaks cannot always be detected by smell.
Gas suppliers recommend that you use a gas detector approved by UL or CSA.
For more information, contact your gas supplier.
If a gas leak is detected, follow the “What to do if you smell gas” instructions.

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.

ADDITIONAL SAFETY INFORMATION

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.

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.

Tools and Parts

Gather the required tools and parts before starting installation.
Read and follow the instructions provided with any tools listed
here.

Tools needed

■ Pipe wrench

■ Screwdriver

■ Tape measure

■ Thread sealant

■ Level

■ Noncorrosive leak check solution

■ Test g auge w ith ¹⁄₈" NPT connection

(for measuring gas supply pressure)

■ Allen wrench

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 design is certified by CSA International as a
Category I furnace in compliance with the latest edition of
American National Standard Z21.47/CSA Standard 2.3 for Gas­Fired Central Furnaces, for operation with Natural gas or
propane. Consult the rating plate on the furnace for gas type
before installing.

Parts needed

Check local codes and with gas supplier. Check existing gas
supply, electrical supply, and venting, and read “Ductwork
Requirements,” “Electrical Requirements,” “Gas Supply
Requirements” and “Venting Requirements” before purchasing
parts.

3

Location Requirements

WARNING

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.

WARNING

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.

■ 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" (45.7 cm) above the floor. The furnace is to be
located or protected to avoid physical damage by vehicles.

■ 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.
See “Installation Configurations.”

■ If the furnace is to be installed in an attic or other insulated

space, it must be kept free and clear of insulating materials.

Explosion Hazard

Installation Clearances

Do not install this furnace in a mobile home.
Doing so can result in death, explosion, fire, or

carbon monoxide poisoning.

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

■ A 2" (5.1 cm) 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 the furnace is installed in a closet or utility
room, provide 24" (61 cm) 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 (centimeters)

Upflow and Counterflow Installations

Sides

Cabinet Width Front Back Top Vent Left Right

14¹⁄₂ (36.9) 4 (10.2)
17¹⁄₂ (44.4) 4 (10.2)
21 (53.3) 4 (10.2)
24¹⁄₂ (62.3) 4 (10.2)

1

1

1

1

0 1 (2.5) 6 (15.2)
0 1 (2.5) 6 (15.2)
0 1 (2.5) 6 (15.2)
0 1 (2.5) 6 (15.2)

2

2

2

2

3

3 (7.6)
2 (5.1)

0

3

0
1 (2.5) 0
00

Horizontal Installations (Models WFAT and WFLT only)

Airflow
R to L L to R

Cabinet Width Front Back Vent Top Bottom Top Bottom

14¹⁄₂ (36.9) 4 (10.2)
17¹⁄₂ (44.4) 4 (10.2)
21 (53.3) 4 (10.2)

1

1

1

06 (15.2)
06 (15.2)
06 (15.2)

2

2

2

1 (2.5) 3 (7.6)
1 (2.5) 2 (5.1)
1 (2.5)0 1 (2.5)0

1

2

3 (7.6)
2 (5.1)

1

0

2

0

4

Minimum Clearance to Combustibles Chart

All measurements in inches (centimeters)

Horizontal Installations (Models WFAR and WFLR only)

Airflow
R to L L to R

Cabinet Width Front Back Vent Top Bottom Top Bottom

14¹⁄₂ (36.9) 4 (10.2)
17¹⁄₂ (44.4) 4 (10.2)
21 (53.3) 4 (10.2)
24¹⁄₂ (62.3) 4 (10.2)

1

May be 2" (5.1 cm) when Type B-1 vent pipe is used.

2

May be 1" (2.5 cm) 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.

1

1

1

1

06 (15.2)
06 (15.2)
06 (15.2)
06 (15.2)

2

2

2

2

3 (7.6)
2 (5.1)

2

03 (7.6)

2

02 (5.1)

1

2

3 (7.6)

2 (5.1)

2

2

1 (2.5)0 1 (2.5)0
1 (2.5)0 1 (2.5)0

■ High Altitude Installations

■ This furnace is approved for operation at altitudes from 0 to

4,500 ft (1,371.6 m) above sea level without any required
modifications.

■ From 4,500 to 7,500 ft (1,371.6 m to 2,286 m), the gas

manifold pressure needs to be adjusted according to the
information shown in the Manifold Pressure vs. Altitude
charts.

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 1,600 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.

IMPORTANT:

For installations above 7,500 ft (2,286 m), 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 ft (305 m) above sea level.

The furnace is not recommended for installation above 10,000 ft
(3,048 m).

Installation for Counterflow (Downflow) Models

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.

IMPORTANT:

■ The furnace may be installed directly on the supply plenum or

coil cabinet if the furnace is installed on a noncombustible
floor.

5

■ For installations on combustible flooring, a special base must

be ordered and used. See “Accessories.”

1. Cut, size and frame opening in floor to fit the Combustible

floor base and provide a minimum 1" (2.5 cm) clearance
between the supply duct and combustible materials. The
4 legs on the base assembly should be recessed into the
floor, and the base should rest on all 4 outside flanges.

2. Construct duct connections with 1" to 1³⁄₄" (2.5 cm to 4.4 cm)

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. Position the furnace over the right angle duct flanges.

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 B or D, depending on installation configuration.

Horizontal Installation (WFAR and WFLR models)

Combustible Floor Installation (Counterflow Models only)

B

A

E

D

C

E

A

B

C

1"

A

A. Return
B. Screw placement for

Left to Right airflow

C. Supply
D. Screw placement for

Right to Left airflow

Horizontal Installation (WFAT and WFLT models)

A

A. Supply
B. Screw placement for

Right to Left airflow

C. Return
D. Screw placement for

Left to Right airflow

B

C

D

B

C

D

A. Base assembly
B. Furnace
C. Outlet duct (drops into base

assembly)

6

D. Combustible floor

E. Woven glass tape (between

flanges of outlet duct and
base assembly)

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 2 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.

Ductwork Requirements

■ Install all conditioned air plenums, ducts and air filters (if not

provided on the furnace) in accordance with NFPA 90B
Standard for the Installation of Warm Air Heating and Air­Conditioning Systems (latest edition).

■ The furnace is provided with flanges for the connection of the

plenum and ducts.

Electrical Requirements

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.

■ All air filters must be listed as Class 2 furnace air filters.

■ All ductwork must be made of materials and insulated to

meet local, state and national codes. Ductwork installed
outdoors must be sealed, weatherproofed and protected
against physical damage. Caulking, flashing or other means
of adequately providing a permanent weather seal should be
used where duct penetrates a building or structure opening.

■ 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 [17ºC]
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 Wiring Connection Diagram in
the “Troubleshooting” section for specific connection
information.

■ Proper polarity of the supply connections (“HOT” and

“NEUTRAL”) must be observed to be sure that the control
system provides the protection intended.

■ 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).

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, state and national codes and the regulations of the
utility. Piping must be of adequate size to avoid undue
pressure drop. Consult the local utility or gas supplier for
complete details on special requirements for sizing gas
piping.

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.

■ If local codes allow the use of a flexible gas appliance

connector, use a CSA design-certified outdoor flexible
stainless steel appliance connector or rigid gas supply line as
needed. Do not use a connector which has previously
serviced another gas appliance.

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 the spilling of flue products into the living space, the
formation of condensate, leakage, etc. See the “Carbon
Monoxide Poisoning Hazard” for proper test procedure.

7

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
appliances to their previous conditions of use.

Unconfined Space

An unconfined space is defined as “a space whose volume is
more than 50 cu. ft (1.4 m
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.

3

) per 1,000 Btu/h of the combined input

Confined Space

A confined space is defined as “a space whose volume is less
than 50 cu. ft (1.4 m
rating of all appliances installed in that space.”

3

) per 1,000 Btu/h of the combined input

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

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

8

INSTALLATION INSTRUCTIONS

C

WARNING

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.

Inspect Shipment

WARNING

Plan Vent System

Confined Space Installation—Nondirect Venting Air from
Inside

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" (30.5 cm) of the ceiling and the other
within 12" (30.5 cm) of the floor.

NOTE: Each opening must have a free area of at least 1 sq. in.

2

(6.4 cm
the enclosure, and not less than 100 sq. in. (645 cm

Equipment in Confined Space—All Air from Inside

) per 1,000 Btu/h of total input rating of all equipment in

A

D

2

) each.

B

Excessive Weight Hazard

Use two or more people to move and install furnace.

Failure to do so can result in back or other injury.

This furnace is shipped in one package, completely assembled
and wired. The indoor thermostat and accessories are shipped in
a separate carton when ordered.

1. Check the furnace rating plate to confirm specifications are

as ordered.

2. Upon receipt of the furnace, inspect it for possible shipping

damage. Examine the furnace 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 furnace, because your claim may be denied.

A. Chimney or gas vent
B. Water heater

C. Openings
D. Furnace

Confined Space Installation—Nondirect Venting Air from
Outside

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" (30.5 cm) of the ceiling and one
opening within 12" (30.5 cm) 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 sq. in. (6.4 cm
4,000 Btu/h of the total input rating of all equipment within the
enclosure.

2

) per

9

Equipment in Confined Space—All Air from Outside

C

D

C

B

D

E

C

D

(Inlet air from crawl space and outlet air to ventilated attic)

A

G

F

A. Chimney or gas vent
B. Ventilation louvers (each end of attic)
C. Outlet air
D. Water heater

E. Inlet air

F. Ventilation louvers (for

unheated crawl space)

G. Furnace

B

E

Equipment in Confined Space—All Air from Outside
(All air through ventilated attic)

A

F

A. Chimney or gas vent
B. Ventilation louvers

(each end of attic)

C. Outlet air

D. Inlet air (ends 12" [30.5 cm] above

bottom)
E. Water heater
F. F u rn a c e

Equipment in Confined Space—All Air from Outside
(All air from horizontal ducts)

A

NOTE: Another option is to use horizontal combustion ducts. If
horizontal combustion ducts are run, 1 sq. in. (6.4 cm

2

) per
2,000 Btu/h 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 1 sq. in.

2

(6.4 cm

) per 4,000 Btu/h of the total input rating of all other

equipment in the enclosure.

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" (6.4 mm) per ft
(m)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 36" (91.4 cm) above the

highest point where it passes through a roof of a building and
at least 24" (61 cm) higher than any portion of a building
within a horizontal distance of 10 ft (3 m) as shown.

Vent Option—Vent Through Roof

B

C

A

10

B

A. 36" (9.14 cm) minimum

E

D

B. Less than 10 ft (3 m)

■ All vents passing through floors, ceilings, and walls must be

fire stopped according to the requirements of the National

C. 24" (6.1 cm) minimum
D. Ridge

Fuel Gas Code. See vent options.

A. Chimney or gas vent
B. Outlet air
C. Water heater

D. Inlet air
E. Furnace

Vent Option—Vent Through Ceiling

B

C

B

C

A
B

C

C

A

Sidewall Venter Limitations Chart

Vent pipe diameter 4" (10.1 cm)
Minimum vent pipe length 48" (121.9 cm)
Maximum vent pipe length 25 ft* (7.6 m)
Maximum number of 90° elbows 4
*When fewer than 4 elbows are used, maximum vent pipe length

can be increased by 5 ft (1.5 m) per unused elbow.

A. 26-gauge galvanized firestop on top of framed opening
B. Flue pipe

C. 1" (2.5 cm) clearance between flue pipe and frame

Vent Option—Vent Through Floor

A

D

A. Pipe collar (Firestop)
B. Flue pipe

D

C. Floor
D. 1" (2.5 cm)

Sidewall Venting

This furnace can be sidewall (horizontally) vented with a listed
sidewall venter such as Field Controls Model SWG-4HD with CK­43 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
(1.5 m) intervals.

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

B

A

Vent Through Wall

A. Thimble
B. Flue pipe

C. Combustible wall

A. Cleanout
B. Liner
C. Lined masonry chimney

11

Factory-Built Chimney Venting

A

B

A. Factory-built chimney
B. Cleanout

NOTE: All vent pipe run outside shall be constructed of factory­built 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 keep 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.

Determine Vent Pipe Direction

The vent system of the furnace must be self-supporting and must not apply any weight load to the combustion blower.

Combustion Air Sources

There are 2 sources for combustion air:

1. From outside the building (Direct Vent)

2. From inside the building (Nondirect Vent)

Please read the information provided here about Vertical and
Horizontal Venting, then find and follow the instructions for your
venting configuration.

Vertical Venting

A vertical vent should extend through the roof a minimum of 24"
(61 cm) and not be obstructed a minimum of 10 ft (3 m) in any
direction.

Horizontal Venting

The vent terminal location shall comply with the National Fuel
Gas Code (ANSI Z223.1) or local requirements. For informational
purposes, the side wall terminal vent clearances are shown in the
Sidewall Vent Terminal Clearances tables.

12

Sidewall Vent Terminal Clearances—Nondirect Vented Furnaces (Horizontal Venting)

Inside

Corner Detail

G

V

Vent Terminal

V

Air Supply Intake

X

Area Where Terminal Is
Not Permitted

V

H

Fixed
Closed

I

M

V

X

K

1

D

E

V

B

V

L

Fixed
Closed

C

V

V

F

A

Operable

B

B

V

B

V

B

A

X

J

B

Operable

U.S. Installations
A Clearance above grade, veranda, porch, deck, or balcony 12" (30.5 cm)
B Clearance to window or door that may be opened 48" (121.9 cm) below or to side of opening; 12"

(30.5 cm) above opening

C Clearance to permanently closed window *
D Vertical clearance to ventilated soffit located above the terminal within a

*

horizontal distance of 24" (61 cm) from the center line of the terminal

E Clearance to unventilated soffit *
F Clearance to outside corner *
G Clearance to inside corner *
H Clearance to each side of center line extended above meter/regulator

*

assembly

I Clearance to service regulator vent outlet *
J Clearance to nonmechanical air supply inlet to building or the combustion

air inlet to any other appliance

48" (121.9 cm) below or to side of opening; 12"

(30.5 cm) above opening

K Clearance to a mechanical air supply inlet 36" (91.4 cm) above if within 10 ft (3 m) horizontally
L Clearance above paved sidewalk or paved driveway located on public

7 ft (2.1 m)

property

M Clearance under veranda, porch, deck, or balcony *

1

In accordance with the current ANSI Z2223.1/NFPA 54, National Fuel Gas Code.

*Clearance in accordance with local installation codes and the requirements of the gas supplier and the manufacturer’s installation

instructions.

13

Connect Venting

B

1. Using a ¹⁄₄" (6.4 mm) sheet metal screw, secure the vent pipe

to the inducer blower outlet.

2. Make sure all vent connections do not leak.

Install Duct Work

IMPORTANT:

■ Install duct work in accordance with NFPA 90B and any local

codes.

■ When the furnace is installed so that the supply ducts carry

air circulated by the furnace to areas outside the space
containing the furnace, the return air shall be handled by a
duct or ducts sealed to the furnace casing and terminated
outsides the space containing the furnace.

■ 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 avoid a negative pressure on the venting
system.

3. Check that the venting is open, and that it is the correct size.

4. Check that the vent pipe terminates outside the building.

When installing a WEC coil in a horizontal position with a
horizontal gas furnace, the open end of the A-coil must face the
supply air outlet of the furnace (blow into the open end of the A­coil). The A-coil should point away from the supply air outlet of
the furnace as shown.

A

A. Supply
B. Return

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 avoid any entrance of air from the closet into the
circulating air.

Installation with an Evaporator Coil

IMPORTANT: When an air conditioning 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.

Filter Specifications

Upflow Models

Some 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 1,600 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.

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.

Counterflow Models

Filters are not supplied with these furnaces; however, filters must
be used. It is the installer’s responsibility to install a filter rack with
the ductwork and 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. 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 (182.9 m) 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.

14

Minimum Filter Requirements Chart

Disposable Filters Cleanable Filters

Airflow
Descriptor

09 480 (3,096.8) 20 x 25 (50.8 x 63.5) 1 240 (1,548.4) 16 x 20 (40.6 x 50.8) 1

10 480 (3,096.8) 20 x 25 (50.8 x 63.5) 1 240 (1,548.4) 16 x 20 (40.6 x 50.8) 1

12 576 (3,716.1) 16 x 20 (40.6 x 50.8) 2 288 (1,858.1) 16 x 20 (40.6 x 50.8) 1

14 672 (4,335.5) 20 x 20 (50.8 x 50.8) 2 336 (2,167.7) 20 x 20 (50.8 x 50.8) 1

16 768 (4,954.8) 20 x 20 (50.8 x 50.8) 2 384 (2,477.4) 20 x 20 (50.8 x 50.8) 1

20, 22 960 (6,193.5) 20 x 25 (50.8 x 63.5) 2 480 (3,096.8) 20 x 25 (50.8 x 63.5) 1

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.

Minimum Area—
sq. in. (cm

2

) Size—in. (cm) Quantity

Minimum Area—
sq. in. (cm2) Size—in. (cm) Quantity

■ AFILT529 for bottom return on upflow furnace installations.

■ WAFILTHA7 for single side return in installations requiring

more than 1,600 CFM nominal air delivery.

Make Electrical Connections

5. Using UL listed wire connectors, connect the field supply

WARNING

wires to the furnace (black to black and white to white).

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.

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 ignition
control board as indicated on the Wiring Connection Diagram in
the “Troubleshooting” section.

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.

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.

6. Connect ground wire to green ground screw.

15

A

B

A. Connect white to white and black to black
B. Green ground screw

7. Replace the furnace electrical connection box cover and

screw.

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

furnace, 5 ft (1.5 m) above the floor, or in accordance with any
local codes.

4. Install a test gauge connection with a ¹⁄₈" (3.2 mm) NPT

plugged tap immediately upstream of the manual gas 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

A
B
C

D

E
F

G

¹⁄₈

" (3.2 mm) NPT plugged tap

A.

B. Manual gas shutoff valve
C. Ground joint union
D. Tee

®

tape.

E. Sediment trap
F. C a p

G. Gas control valve

(inside furnace)

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.

6. Turn off the gas supply at the manual gas shutoff valve.

A

B

A. Closed valve
B. Open valve

7. Remove the inlet pressure tap plug on the gas control valve

and connect pressure gauge to the ¹⁄₈" 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" (12.7 cm) W.C.
for Natural gas and 11" (27.9 cm) W.C. for propane gas.

The maximum inlet gas supply pressure is 10¹⁄₂" (26.7 cm)
W.C. for Natural gas and 13" (33 cm) 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" (3.2 mm) 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

noncorrosive 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.

®Teflon is a registered trademark of E.I. Dupont de Nemours and

Company.

16

Check the Furnace Input Rate

B

C

IMPORTANT:

■ The furnace input rate must not exceed the input rating on

the furnace rating plate.

■ This furnace is equipped for rated input at manifold pressures

of 1.7" (4.32 cm) W.C. (1

nd

(2

stage) for Natural gas. When an LP conversion kit is used,
it is equipped for rated input at manifold pressures of 4.9"
(12.45 cm) W.C. (1

nd

(2

stage) for propane gas.

st

stage) and 3.5" (8.89 cm) W.C.

st

stage) and 10.0" (25.4 cm) W.C.

(if required)

■ 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.

Btu/h
Input

■ At altitudes from 2,000 to 7,500 ft (609.6 m to 2,286 m) the

furnace input rate must not exceed that on the rating plate.

NOTE: The actual heating value of your gas can be obtained from
your local utility company. Typical values are shown in the
Manifold Pressure vs. Altitude Chart in “Adjust the Furnace Input
Rate.”

= Cu. ft per Revolution x 3600 x Heating

# Seconds per Revolution

Value

Adjust the Furnace Input Rate

For Altitudes 4,500 to 7,500 ft (1,371.6 m to 2,286 m)
Above Sea Level

1. Remove the burner access door.

2. Move the gas control to the OFF position. Use only your hand

to move the gas control; tools are not required.

3. Remove the outlet pressure tap plug on the gas control valve

and connect pressure gauge to the ¹⁄₈" (3.2 mm) NPT outlet
pressure tap.

Gas Control Valve

A

G

F

A. Regulator adjusting cap

¹⁄₈

" (3.2 mm) NPT outlet pressure tap

B.

¹⁄₂

" (1.3 cm) NPT outlet

C.
D. Gas control

E

ON

OFF

E. Alternate gas control

F.

¹⁄₈

" (3.2 mm) NPT inlet

pressure tap

¹⁄₂

" (1.3 cm) NPT inlet

G.

D

(if required)

4. Be sure the gas control has been in the OFF position for at

least 5 minutes before starting the unit.

5. Move the gas control 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 charts for the

correct manifold pressure. If necessary, remove the regulator
adjusting cap on the gas control 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 to the OFF position.

11. Disconnect the pressure gauge from the ¹⁄₈" (3.2 mm) NPT

outlet pressure tap.

12. Replace outlet pressure tap plug and the regulator adjusting
cap on the gas control valve.

13. Move the gas control 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.

17

Manifold Pressure vs. Altitude Chart—
Models WFAR, WFAT, WFLU, WFLR, WFLT Only

Manifold Pressure vs. Altitude Chart—
Model WFAU 150 only

Natural Gas

Manifold

Heating Value

3

Altitude—ft (m)

2,000 (609.6) 948 3.5 (8.89) 0.9666
3,000 (914.4) 914 3.5 (8.89) 0.9499
4,000 (1,219.2) 881 3.5 (8.89) 0.9332
4,500 (1,371.6) 865 3.5 (8.89) 0.9249
5,000 (1,524) 849 3.29 (8.36) 0.8900
5,500 (1,676.4) 833 3.27 (8.31) 0.8790
6,000 (1,828.8) 818 3.25 (8.25) 0.8680
6,500 (1,981.2) 802 3.23 (8.2) 0.8570
7,000 (2,133.6) 787 3.21 (8.15) 0.8460
7,500 (2,286) 771 3.19 (8.1) 0.8350

(Btu/ft

)

Pressure—

in. (cm) W.C.

Input
Factor

Natural Gas

Manifold

Heating Value

3

Altitude—ft (m)

2,000 (609.6) 948 3.41 (8.66) 0.9666
3,000 (914.4) 914 3.41 (8.66) 0.9499
4,000 (1,219.2) 881 3.41 (8.66) 0.9332
4,500 (1,371.6) 865 3.41 (8.66) 0.9249
5,000 (1,524) 849 3.2 (8.13) 0.8900
5,500 (1,676.4) 833 3.18 (8.08) 0.8790
6,000 (1,828.8) 818 3.16 (8.03) 0.8680
6,500 (1,981.2) 802 3.14 (7.98) 0.8570
7,000 (2,133.6) 787 3.12 (7.92) 0.8460
7,500 (2,286) 771 3.11 (7.9) 0.8350

(Btu/ft

)

Pressure—

in. (cm) W.C.

Input
Factor

For Altitudes 7,500 to 10,000 ft (1,371.6 m to 2,286 m)
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).

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 that you have all of your tools.

2. Dispose of/recycle all packaging materials.

3. Check the furnace in its final location. Be sure the vent is not

blocked.

Measure Temperature Rise

1. Adjust room thermostat to the highest temperature setting

possible.

2. 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 72"
[182.9 cm] 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 are
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.

B

C

A

D

A. Measure return air here.
B. Warm air

3. If furnace doesn't maintain temperature rise within the range
shown on the furnace rating plate, adjust the blower speed.

C. Measure supply temperature here.
D. Return air

18

Adjust Blower Speed

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. Disconnect power.

2. For heating speed, check the temperature rise and make the

necessary adjustments to the blower speed tap. See the
wiring diagrams in the “Troubleshooting” section.

3. Reconnect power.

4. Recheck the temperature rise. Repeat the procedure as

necessary to achieve optimum temperature rise.

5. If the furnace does not begin to heat the room, see the

“Troubleshooting” section.

NOTE:

while performing the following procedure.

See the wiring diagrams in the “Troubleshooting” section

Shut Down

If the construction will continue or the furnace will not be used for
a period of time, follow the shut down procedure.

1. Set the thermostat to the lowest setting.

2. Disconnect power.

SEQUENCE OF OPERATION

Heating

During a call for heat, the thermostat closes R - W circuit of the
control board. The control board verifies limit switches are closed
and pressure switch is open. The induced draft blower relay
closes, causing the blower to run. As vent pressure is developed
by the induced draft blower, the pressure switch closes. After a
15-second pre-purge, the control energizes the hot surface
igniter. After the 7-second warm-up time, the control energizes
the main gas control valve, causing the main burners to ignite.
The hot surface igniter is de-energized 3 seconds after the main
valve opens.

Fan On

During a fan on call, the thermostat energizes the R - G circuit of
the control board, immediately causing the fan to energize the
COOL speed. The fan remains energized as long as the
thermostat calls for fan on operation.

If a call for cooling is energized during a fan on call, the fan
continues to operate at the COOL speed. If a call for heat is
energized during a fan on call, the control de-energizes the fan
immediately and begins the heat call/ignition sequence.

3. Remove burner access panel.

4. Turn off the gas supply at the manual gas shutoff valve.

5. Replace the burner access panel.

If flame is sensed during this time, the main valve remains
energized and the control starts the 30-second heat blower “on”
delay.

As heating demand is met, the thermostat de-energizes the R - W
circuit. The control de-energizes the main valve, causing the
burners to shut off. The induced draft blower shuts off after a
15-second post-purge delay. The circulating air blower will
continue to operate until the user-selectable heat blower “off”
delay expires. The control returns to standby mode once the heat
blower “off” delay expires.

At the end of the fan on call, the thermostat de-energizes the R ­G circuit of the control, causing the fan to be de-energized
immediately.

19

Cooling

During a call for cooling, the thermostat energizes the R - Y
circuit of the control board. After a 1-second cooling “on” delay,
the control energizes the cooling fan speed. If the fan is already
energized, it remains running and does not de-energize for the
1-second cooling fan “on” delay.

The call for cooling has priority over continuous fan operation
while a call for heating has priority over both a call for cooling or
continuous fan. Ignition lockouts for any reason do not affect
cooling operation.

CONTROLS

As cooling demand is met, the thermostat de-energizes the R - Y
circuit of the control board. After a 60-second cooling “off” delay,
the control de-energizes the cooling speed fan. At the end of the
cooling “off” delay period, the control returns to the standby
mode.

Pressure Switch

The pressure switch is a normally open switch that monitors
combustion airflow. 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.

Ignition Control Board

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.

The ignition control board operates the gas control valve,
circulating air blower, combustion blower and any accessories
connected to it. The ignition control contains control logic to
sense proper operating conditions and provides ignition only
when all conditions are properly met.

These models feature user-selectable blower “off” delay times
(60, 90, 120 and 180 seconds) that are factory set to provide a
120-second blower “off” delay on heating. See “Wiring
Connection Diagram.”

20

Gas Control Valve

The gas control valve regulates the manifold gas pressure and
provides gas flow.

TROUBLESHOOTING

Furnace Fails to Operate Properly

Review “Sequence of Operation” and visually inspect the
following before troubleshooting:

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.

■ Is the integrated ignition/blower control board and 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?

■ Are all wiring connections secure?

Start the system by setting the thermostat above the room
temperature. Observe system response. Then use the
information provided in this section to check the system
operation.

Fault Code History Button

The control stores the last 5 fault codes in memory. A pushbutton
switch is located on the control. When the pushbutton switch is
pressed and released, the control flashes the stored fault codes.
The most recent fault code is flashed first; the oldest fault code is
flashed last. To clear the fault code history, press and hold the
pushbutton switch in for more than 5 seconds before releasing.

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 ignition control. 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 Chart

LED Status Fault Description

LED Off No power to control or control hardware fault

detected
LED On Normal operation
1 Flash Flame present with gas control valve off
2 Flashes Pressure switch closed with inducer off
3 Flashes Pressure switch open with inducer on
4 Flashes High limit switch open
5 Flashes Rollout switch open
6 Flashes Pressure switch cycle lockout
7 Flashes Lockout due to no ignition
8 Flashes Lockout due to too many flame dropouts
9 Flashes Incorrect line voltage phasing

21

Wiring Connection Diagram—Honeywell

Hot Surface Igniter

Induced
Draft
Blower

®

VR 8205 System

Interlock

Switch

G
W

BK

W (NEUT)
R (LO)

OR (MED/LO)

BU (MED)
Y (MED/HI)
BK (HIGH)

Not on all models

Line Voltage - Factory
Line Voltage - Field
Low Voltage - Factory
Low Voltage - Field

Circulation
Blower

BK

W

Y
W
Y
BK

60
90

120

180

Blower Off
Delay Timing
(See Note 3)

NEUTRALS

HUM

L1

Fault Code

History

Button

(See Note 1)

RCW

60

90
120
180

TWIN

SW1

Thermostat & Sub-base

Heat Anticipator

0.60 Amp

XFMR

CONT

YG

EAC

HEAT

COOL

PARK
PARK

PARK

5A Fuse

W

BK/W Stripe

If Used

OR

Condenser

Transformer

Rollout
Switch

V

Aux

Limit

Switch

OR

V

Y

Y/BK Stripe

Rollout
Switch

W

BR

Aux
Limit
Switch

If Used

OR

GY

High Limit

Switch

V

Pressure

Switch

R

BU

Gas Control

V

MV
MV

Valve

Flame

Sensor

Check codes for proper wiring and circuit protection before
installation.

NOTES:

1. Press and release fault code history button to display fault

codes. To erase codes, press and hold button in for more
than 5 seconds.

22

2. 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 194ºF (90ºC).

3. Blower off delay timing is factory set at 120 seconds. To

change, move the jumper to the pins adjacent to the desired
setting.

Wiring Schematic—Honeywell

®

HR 8205 System

H

Interlock
Switch

K3

K2

K4 K5

K5

120/1/60

Induced Draft

Blower

Hot Surface Igniter

Humidifier

Air Cleaner

Heat

Cool

N

N

Neutrals

Neutrals

Neutrals

Neutrals

Neutrals

Blower Motor

Flame Sensor

Gas Control Valve

120 VAC

24 VAC

Pin 3

Pin 2

Pin 12

Pin 9

Pin 8

Pin 4

Transformer

Pin 6

Pin 5

Pin 11

Pin 1

Pin 7

Pin 10

Neutrals

If Used

Rollout Switch Rollout Switch

Limit Switch

If Used

Pressure SwitchAux Limit SwitchAux Limit Switch

Thermostat

Condenser

23

ASSISTANCE OR SERVICE

If you need further assistance, you can write to the below
address with any questions or concerns:

Whirlpool
14610 Breakers Drive
Jacksonville, FL 32258

Please include a daytime phone number in your correspondence.

®

Home Cooling and Heating

Accessories

To order accessories ask for the appropriate part number listed
below or contact your Whirlpool
dealer.

ALPKT572-3 Natural Gas to Propane Conversion Kit
ALPKT574-2 Natural Gas to Propane Conversion Kit

®

Home Cooling and Heating

WAFILTHA7-2

Filter Frame Kit
AFILT524-1 Side Return Filter Kit
AFILT529-1 Bottom Return Filter Kit
WABASE511 Combustible Floor Base (14¹⁄₂" [36.9 cm] cabinets)
WABASE512 Combustible Floor Base (17¹⁄₂" [44.4 cm] cabinets)
WABASE568 Combustible Floor Base (21" [53.4 cm] cabinets)
WABASE569 Combustible Floor Base (24¹⁄₂" [62.3 cm] cabinets)

46924B008

© 2008. All rights reserved.

Honeywell is a trademark of Honeywell International, Inc.

Manufactured under license by Tradewinds Distributing Company, LLC., Coconut Grove, Florida

®Registered Trademark/TM Trademark of Whirlpool, U.S.A.,

Printed in U.S.A.

3/08