Whirlpool WFCU User manual

90+ GAS FURNACE INSTALLATION INSTRUCTIONS
GAS FURNACE SAFETY
Table of Contents
GAS FURNACE SAFETY................................................................1
INSTALLATION REQUIREMENTS................................................3
Tools and Parts ............................................................................3
Location Requirements................................................................4
Installation Configurations ...........................................................5
Ductwork Requirements ..............................................................5
Electrical Requirements ...............................................................6
Gas Supply Requirements...........................................................6
Venting Requirements..................................................................6
INSTALLATION INSTRUCTIONS..................................................8
Inspect Shipment .........................................................................8
Plan Vent System.........................................................................8
Determine Vent Pipe Direction...................................................10
Install Ductwork..........................................................................17
Filter Specifications....................................................................17
Make Electrical Connections .....................................................18
Make Gas Connections..............................................................19
Check the Furnace Input Rate (if required)................................20
Adjust the Furnace Input Rate (if required) ................................20
Complete Installation..................................................................21
Shut Down..................................................................................21
SEQUENCE OF OPERATION ......................................................22
Heating Cycle .............................................................................22
Fan On Cycle..............................................................................22
Cooling Cycle .............................................................................22
CONTROLS ...................................................................................23
TROUBLESHOOTING ..................................................................24
ASSISTANCE OR SERVICE.........................................................27
Accessories ................................................................................27
46948B008
Whirlpool®Home Cooling and Heating
14610 Breakers Drive
Jacksonville, FL 32258
Whirlpool®and Whirlpool Gold®Models
WFCU, WFCC, WGFDC, WGFDU
You can be killed or seriously injured if you don't immediately
You can be killed or seriously injured if you don't follow
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:
follow instructions.
instructions.
DANGER
WARNING

2
SAVE THESE 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.
■Adequate clearance must be provided around the
vent-air intake terminals.
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.
■
IMPORTANT SAFETY INSTRUCTIONS
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.
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.

3
ADDITIONAL SAFETY INFORMATION
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 design is certified by CSA International as a
Category IV furnace in compliance with the latest edition of
American National Standard Z21.47/CSA Standard 2.3 for Gas-
Fired Central Furnaces, for operation with Natural gas or
propane. Consult the rating plate on the furnace for gas type
before installing.
Tools and Parts
Gather 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 “Ductwork
Requirements,” “Electrical Requirements,” “Gas Supply
Requirements,” “Venting Requirements” and “Installation
Configurations” before purchasing parts.
Parts supplied
■Inlet air restrictor plate
■Flue pipe screen
■Condensate disposal kit
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.
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.
■Pipe wrench
■Screwdriver
■Tape measure
■Thread sealant
■Level
■Noncorrosive leak check
solution
■Test ga uge with ¹⁄₈" (3.2 mm)
NPT connection (for measuring
gas supply pressure)
■Allen wrench

4
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 condensate drain on this furnace is incorporated within
the furnace and must be primed before start-up. The
condensate system must not be exposed to temperatures
under 32°F (0ºC).
■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.
■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" (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.
High Altitude Installations
■This furnace is approved for operation at altitudes from 0 to
4,500 ft (0 to 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 Chart
in the “Adjust the Furnace Input Rate” section.
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 (304.8 m) above sea level.
The furnace is not recommended for installation above 10,000 ft
(3,048 m).
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
Explosion Hazard
Do not install this furnace in a mobile home.
Doing so can result in death, explosion, fire, or
carbon monoxide poisoning.
Minimum Clearance to Combustibles Chart
Unit Sides 0"
Rear of Unit 0"
Front of Unit 2" (5.1 cm)
Flue Pipe 0"
Plenum Top (upflow) 1" (2.5 cm)
Supply Duct (counterflow) 1"(2.5 cm)

5
Installation Configurations
WGFDU and WFCU models must be installed only as upflow
furnaces.
WGFDC and WFCC models must be installed only as
counterflow (downflow) furnaces.
IMPORTANT: To ensure access to parts for servicing, install
upflow and counterflow furnaces so that the burner and blower
access panels are readily accessible.
Upflow Installations
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 furnaces 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.
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 noncombustible
floor.
■For installations on combustible flooring, a special base must
be ordered and used. See the “Accessories” section.
1. Cut a hole in the floor, sized to provide 1" (2.5 cm) clearance
between all 4 sides of the duct and the edge of the flooring.
The 4 angles on the base assembly should be recessed into
the floor joists, 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.
Combustible Floor Installation (Counterflow Models only)
Filters
If a filter other than the one supplied by the furnace manufacturer
is used, see Minimum Filter Requirements in “Filter
Specifications.”
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 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.
■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.
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. A. Base assembly
B. Furnace
C. Outlet duct (drops into base
assembly)
D. Combustible floor
E. Woven glass tape (between
flanges of outlet duct and
base assembly)
1"
AB
C
D
E
C
E
A
B