90+ 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 ..............................................................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
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.
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:
DANGER
WARNING
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.
Whirlpool® and Whirlpool Gold® Models
WFCU, WFCC, WGFDC, WGFDU
46948B008
Whirlpool® Home Cooling and Heating
14610 Breakers Drive
Jacksonville, FL 32258
IMPORTANT SAFETY INSTRUCTIONS
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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.
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Provide adequate combustion and ventilation air to
the furnace space as specified in the “Venting
Requirements” section of these 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.
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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.
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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.
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.
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The furnace shall be installed so the electrical
components are protected from water.
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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:
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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.
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 GasFired 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
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Pipe wrench
Screwdriver
Tape measure
Thread sealant
Level
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Noncorrosive leak check
solution
Test gauge with ¹⁄₈" (3.2 mm)
NPT connection (for measuring
gas supply pressure)
Allen wrench
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
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Inlet air restrictor plate
Flue pipe screen
Condensate disposal kit
3
Location Requirements
WARNING
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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.
Explosion Hazard
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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.
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Failure to follow these instructions can result in death,
explosion, or fire.
Installation Clearances
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WARNING
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.
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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
Explosion Hazard
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
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.
4
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)
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).
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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.
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)
B
B
A
Installation for Counterflow (Downflow) Models
E
D
WARNING
C
1"
C
Fire Hazard
Before installing counterflow (downflow) furnace on
combustible surface, such as wood, install one of the
following kits:
E
WABASE 511 (14.5" cabinets)
WABASE 512 (17.5" cabinets)
WABASE 568 (21" cabinets)
WABASE 569 (24.5" cabinets)
A
Contact your local dealer.
A. Base assembly
B. Furnace
C. Outlet duct (drops into base
assembly)
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.
■ For installations on combustible flooring, a special base must
be ordered and used. See the “Accessories” section.
D. Combustible floor
E. Woven glass tape (between
flanges of outlet duct and
base assembly)
Filters
If a filter other than the one supplied by the furnace manufacturer
is used, see Minimum Filter Requirements in “Filter
Specifications.”
Ductwork Requirements
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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.
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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.
5
Electrical Requirements
WARNING
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.
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.
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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 [17.2ºC]
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.
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.
■ 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.
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/NFPA 54 (latest edition), or applicable provisions
of the local building codes.
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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.
Venting Options
The furnace can be installed as either direct vent or nondirect
vent units.
For either type of installation, special venting considerations
must be followed. See “Determine Vent Pipe Direction” for the
type of furnace and venting being installed.
Direct Vent
A direct vent (two pipe) installation requires that all the air
necessary for combustion be supplied from outside the dwelling
through an air intake pipe.
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 (1.4 m3) per 1,000 Btu/h of the combined input
rating of all appliances installed in that space.” Use direct vent
method. See “Plan Vent System.”
Nondirect Vent
A nondirect vent (one pipe) installation uses air from inside the
dwelling for combustion.
■ The furnace is shipped with the air inlet pipe terminated to the
top panel for either inside or outside combustion air. An inlet
air restrictor plate is supplied with this furnace and can be
found in the plastic bag containing these Installation
Instructions and the User’s Information Manual.
■ For installations using inside air for combustion (nondirect
vent), attach a 90° elbow (not supplied) to the inlet coupler
and install the restrictor plate inside the elbow. See
“Nondirect Vent Installation.”
Inlet Air Restrictor Plate
IMPORTANT: The inlet air restrictor plate must be installed in all
nondirect vent systems.
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
Flue Pipe Screen
A flue pipe screen designed to keep objects out of the flue pipe is
included in the plastic bag.
In all installations, this screen should be installed at the
termination of the flue pipe.
Flue Pipe Screen
IMPORTANT: The flue pipe screen should be installed at the
termination of the flue pipe in all installations.
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)
Unconfined Space
Printing inks, paint removers, varnishes, etc.
Cements and glues
An unconfined space is defined as “a space whose volume is
more than 50 cu. ft (1.4 m3) per 1,000 Btu/h of the combined input
rating of all appliances installed in that space.”
Antistatic fabric softeners for clothes dryers
Masonry acid washing materials
Chlorinated laundry products
Hydrochloric acid
7
INSTALLATION INSTRUCTIONS
WARNING
Explosion Hazard
Furnace must be installed and serviced by a
qualified person.
Examples of a qualified person include:
IMPORTANT:
■ The venting system must be supported with mounting straps
to keep any weight load from being applied to the vent
blower. Horizontal vent pipe must be supported every 5 ft and
vertical pipe should be supported every 10 ft to avoid sagging
and provide rigid support.
■ This furnace must not be connected to any Type B, BW, or L
vent or vent connector and must not be connected to any
portion of a factory-built or masonry chimney.
■ This furnace is not to be common vented with any other
appliance. The vent pipe must not be connected to a
chimney flue serving a separate appliance designed to burn
solid fuel.
licensed heating personnel,
authorized gas company personnel.
Read and follow all instructions provided for
installation, adjustment, service, alteration, or
maintenance.
Materials
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Failure to follow these instructions can result in death,
explosion, fire, or carbon monoxide poisoning.
Inspect Shipment
WARNING
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.
Piping and Fitting Specifications
Piping and Fitting Material
ASTM Specification
Schedule 40 PVC (Pipe)
D1785
Schedule 40 PVC (Cellular Core Pipe)
F891
Schedule 40 PVC (Fittings)
D2466
SDR-26 (Pipe)
D2241
Schedule 40 ABS (Pipe)
D1527
Schedule 40 ABS (Fittings)
D2468
Schedule 40 & 80 CPVC (Pipe)
F441
ABS-DWV Drain Waste & Vent
(Pipe & Fittings)
D2661
PVC-DWV Drain Waste & Vent
(Pipe & Fittings)
D2665
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Plan Vent System
The high efficiency of this furnace is accomplished by the
removal of both sensible and latent heat from the flue gases. The
removal of latent heat results in the condensation of moisture in
the flue gases. This condensation occurs in the secondary heat
exchanger and in the vent system. Therefore, this furnace
requires special venting considerations and the instructions must
be followed to ensure proper operation. All venting must be in
accordance with the codes having jurisdiction in the area and
these instructions.
8
All pipe, fittings, primer, and solvent cement must conform
with American National Standard Institute and the American
Society for Testing and Materials (ANSI/ASTM) standards.
The solvent shall be free flowing and contain no lumps,
undissolved particles, or any foreign matter that adversely
affects the joint strength or chemical resistance of the
cement. The cement shall show no gelatinization,
stratification, or separation that cannot be removed by
stirring. See Piping and Fitting Specifications chart for
approved piping and fitting materials.
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The primers and solvents used must also meet ASTM
specifications. PVC primer is specified in ASTM F656. Use
PVC solvent as specified in ASTM D2564 and ABS solvent
cement as specified ASTM D2235. Low temperature solvent
cement is recommended. Metal or plastic strapping may be
used for vent pipe hangers.
When making ABS joints, pieces can be prepared with a
cleaner. When joining ABS to PVC materials, use PVC solvent
cement as specified in ASTM D3138.
Preferred fittings are DWV style or long sweep. Seal all joints
gas tight with appropriate cement. In areas where vent and air
intake pipes are exposed to abnormal stress or are subject to
damage, schedule 80 pipe should be used.
Use high temperature RTV silicone sealant to attach the air
intake pipe into the connector on the burner box so the air
intake pipe can be removed if service is required.
NOTE: Do not use cement.
Vent Pipe Size and Length
The vent pipe and air intake pipe (in direct vent installations) should be sized in accordance with the information found in the Vent Table
charts. One 90° elbow is equivalent to 5 ft (1.5 m) of pipe. Two 45° elbows are equivalent to one 90° elbow. The minimum length
certified for use with this furnace is 5 ft (1.5 m) and one elbow, not including the vent and air intake terminals.
Vent Table—40,000 to 80,000 Btu/h Models
Vent Pipe Length—ft (m) Minimum Pipe Diameter—in. (cm)
5 (1.5)
1¹⁄₂ (3.8)
1¹⁄₂ (3.8)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
10 (3)
1¹⁄₂ (3.8)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
20 (6.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2¹⁄₂ (6.4)
30 (9.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2¹⁄₂ (6.4) 2¹⁄₂ (6.4) 2¹⁄₂ (6.4)
40 (12.2)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4) 2¹⁄₂ (6.4) 2¹⁄₂ (6.4) 2¹⁄₂ (6.4)
50 (15.2)
2 (5.1)
2 (5.1)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4) 2¹⁄₂ (6.4) 2¹⁄₂ (6.4) 3 (7.6)
60 (18.3)
2 (5.1)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4) 3 (7.6)
3 (7.6)
3 (7.6)
70 (21.3)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
NR
80 (24.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
NR
NR
90 (27.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
NR
NR
NR
Number of 90º Elbows
0
1
2
3
4
5
6
7
8
9
NR = Not Recommended
Vent Table—90,000 to 100,000 Btu/h Models
Vent Pipe Length—ft (m) Minimum Pipe Diameter—in. (cm)
5 (1.5)
NR
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4) 2¹⁄₂ (6.4)
10 (3)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4) 2¹⁄₂ (6.4)
20 (6.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2 (5.1)
2¹⁄₂ (6.4) 2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4) 3" (7.6)
30 (9.1)
2 (5.1)
2 (5.1)
2 (5.1)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4) 2¹⁄₂ (6.4)
3 (7.6)
3 (7.6)
3 (7.6)
40 (12.2)
2 (5.1)
2 (5.1)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
50 (15.2)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
NR
60 (18.3)
2¹⁄₂ (6.4)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
NR
NR
NR
70 (21.3)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
3 (7.6)
NR
NR
NR
NR
NR
80 (24.4)
3 (7.6)
3 (7.6)
3 (7.6)
NR
NR
NR
NR
NR
NR
NR
90 (27.4)
3 (7.6)
3 (7.6)
NR
NR
NR
NR
NR
NR
NR
NR
Number of 90° Elbows
0
1
2
3
4
5
6
7
8
9
NR = Not Recommended
9
Vent Table—112,000 to 125,000 Btu/h Models
Vent Pipe Length—ft (m) Minimum Pipe Diameter—in. (cm)
5 (1.5)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
10 (3)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
3 (7.6)
20 (6.1)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
3 (7.6)
3 (7.6)
NR
30 (9.1)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
3 (7.6)
3 (7.6)
NR
NR
NR
40 (12.2)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
2¹⁄₂ (6.4)
3 (7.6)
NR
NR
NR
NR
NR
50 (15.2)
2¹⁄₂ (6.4)
3 (7.6)
3 (7.6)
NR
NR
NR
NR
NR
NR
NR
60 (18.3)
3 (7.6)
3 (7.6)
NR
NR
NR
NR
NR
NR
NR
NR
Number of 90° Elbows
0
1
2
3
4
5
6
7
8
9
NR = Not Recommended
In the event that the pipe length is in between the lengths listed in
the Vent Table, use the next larger length listed. For example, if a
length of pipe needed to install the furnace is 27 ft (8.2 m), use
the diameter values for the 30 ft (9.1 m) row in the tables.
For direct vent installations, if the vent and air intake pipe are not
equal in length and number of elbows, then determine the
minimum pipe diameter for both the vent and air intake. If the
results indicate different diameters, use the larger of the two for
both the vent and air intake.
NOTE: Under no circumstances should the vent and air intake
pipe size be different in diameter. See “Plan Vent System” for the
furnace model and type of installation.
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.
10
Vertical Venting
A vertical vent should extend through the roof a minimum of 24"
(5.1 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.
Sidewall Vent Terminal Clearances (Direct Vented Furnaces—Horizontal Venting)
V Vent Terminal
Air Supply Intake
X
Inside
Corner Detail
Area Where Terminal Is
Not Permitted
G
V
D
A
V
L
H
Fixed
Closed
E
V
Operable
B
C
B
B
V
F
V
V
I
V
B
X
V
B
A
X
V
K
J
B
M
Fixed
Closed
Operable
U.S. Installations1
A
Clearance above grade, veranda, porch, deck, or balcony
12" (30.5 cm)
B
Clearance to window or door that may be opened
6" (15.2 cm) for appliances less than 10,000 Btu/h, 9" (22.9 cm)
for appliances greater than 10,000 Btu/h, and less than or equal
to 50,000 Btu/h, 12" (30.5 cm) for appliances greater than
50,000 Btu/h
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
6" (15.2 cm) for appliances less than or equal to 10,000 Btu/h, 9"
(22.9 cm) for appliances greater than 10,000 Btu/h, and less than
or equal to 50,000 Btu/h, 12" (30.5 cm) for appliances greater
than 50,000 Btu/h
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 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.
11
Sidewall Vent Terminal Clearances (Nondirect Vented Furnaces—Horizontal Venting)
V Vent Terminal
Air Supply Intake
X
Inside
Corner Detail
Area Where Terminal Is
Not Permitted
G
V
D
A
V
L
H
Fixed
Closed
E
V
Operable
B
C
B
B
V
F
V
V
I
V
B
B
X
V
A
M
X
V
K
J
Fixed
Closed
B
Operable
U.S. Installations1
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 48" (121.9 cm) below or to side of opening; 12"
air inlet to any other appliance
(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
property
7 ft (2.1 m)
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.
12
Direct Vent Installation—Upflow Installations
■
■
■
■
Refer to the appropriate vent table for proper pipe size, vent
length and the number of elbows allowed, and air intake
length and the number of elbows allowed.
Refer to “Materials” in “Plan Vent System” for the proper
venting material.
Do not install the inlet air restrictor plate in any direct vent
installation. The inlet air restrictor plate (see “Inlet Air
Restrictor Plate” in “Venting Requirements”) supplied with
this furnace is to be used only in nondirect vent applications.
The flue pipe screen, designed to keep objects out of the flue
pipe (see “Flue Pipe Screen” in “Venting Requirements”),
should be installed at the termination of the flue pipe.
NOTE: Do not place an additional flue pipe screen in the
intake termination because the air intake may freeze shut.
Direct Vent—Upflow (Horizontal Venting)
■
For proper operation, the vent and air intake pipe must be
installed in the same pressure zone. Therefore, in horizontal
venting applications they must be on the same side of the
house within the parameters as shown.
NOTE: The 18" (45.7 cm) dimension shown below is the
minimum recommended height for extremely cold areas. In
these areas, moisture in the flue gases may condense and
freeze on the air intake if this height is reduced. In milder
climates, this may be reduced to a minimum of 6" (15.2 cm).
Height may be increased as needed provided total length of
pipe to furnace is not exceeded.
Direct Vent—Upflow (Vertical Venting)
B
B
C
D
A
C
D
E
A
F
E
G
H
THRU.
L
K
59.69/56.64
I
H
I
F
Overhead View
I
B
D
G
J
F
A. Run pitch = ¹⁄₄" (6.4 mm) per foot
minimum
B. Optional piece
C. Flue pipe screen (inside flue pipe)
D. Flue pipe
E. 18" (45.7 cm)
F. Air intake pipe
G. 6" (15.2 cm)
H. 12" (30.5 cm) minimum
clearance. Adjust height to
expected snow level based on
local conditions.
I. Wall
J. 3" (7.6 cm) minimum to 48"
(121.9 cm) maximum
K. Condensate collar
L. Air intake pipe
A. 6" (15.2 cm) minimum clearance. Adjust height
to expected snow level based on local
conditions.
B. 6¹⁄₂" (16.5 cm) minimum to 24" (61 cm) maximum
C. Flue pipe screen (inside flue pipe)
D. Storm collars
E. Flashing
F. Air intake pipe
G. Condensate collar
H. Flue pipe
I. Run pitch = ¹⁄₄"
(6.4 mm) per foot
minimum
13
Nondirect Vent Installation—Upflow Installations
■
■
■
Refer to appropriate tables for proper pipe size, vent length
and the number of elbows allowed.
Refer to “Materials” in “Plan Vent System” for the proper
venting material.
An inlet air restrictor plate found in the plastic bag containing
these Installation Instructions and the User’s Information
Manual must be installed in all nondirect vent installations.
See “Inlet Air Restrictor Plate” in “Venting Requirements.”
Nondirect Vent—Upflow (Horizontal Venting)
■
Attach a 90° elbow (not supplied) to the inlet coupler and
install the inlet air restrictor plate inside the elbow.
The flue pipe screen, designed to keep objects out of the flue
pipe (see “Flue Pipe Screen” in “Venting Requirements”),
should be installed at the termination of the flue pipe.
NOTE: Do not place an additional flue pipe screen in the
intake termination because the air intake may freeze shut.
Nondirect Vent Upflow (Vertical Venting)
B
A
A
I
C
C
D
H
B
E
F
(CLOSED)
DRAIN
HOLE
59.69/56.64
THRU.
G
H
A. Run pitch = ¹⁄₄" (6.4 mm) per foot minimum
B. Flue pipe screen (inside flue pipe)
C. 6" (15.2 cm)
D. 12" (30.5 cm) minimum clearance. Adjust
height to expected snow level based on
local conditions.
E. Air intake pipe
F. Condensate collar
G. Inlet air restrictor
plate (inside
inlet coupler)
H. Flue pipe
D
E
F
G
A. Flue pipe screen (inside flue pipe)
B. Storm collar
C. Flashing
D. Flue pipe
E. Air intake pipe
F. Inlet air restrictor plate (inside inlet
coupler)
14
G. Condensate collar
H. Run pitch = ¹⁄₄" (6.4 mm) per
foot minimum
I. 12" (30.5 cm) minimum
clearance. Adjust height to
expected snow level based on
local conditions.
Direct Vent Installation—Counterflow Installations
■
■
■
Refer to appropriate tables for proper pipe size, vent length
and the number of elbows allowed, and air intake length and
the number of elbows allowed.
Refer to “Materials” in “Plan Vent System” for the proper
venting material.
Do not install the inlet air restrictor plate in any direct vent
installation. The inlet air restrictor plate (see “Inlet Air
Restrictor Plate” in “Venting Requirements”) supplied with
this furnace is to be used only in nondirect vent applications.
The flue pipe screen, designed to keep objects out of the flue
pipe (see “Flue Pipe Screen” in “Venting Requirements”),
should be installed at the termination of the flue pipe.
NOTE: Do not place an additional flue pipe screen in the
intake termination because the air intake may freeze shut.
Direct Vent—Counterflow (Horizontal Venting)
■
For proper operation, the vent and air intake pipe must be
installed in the same pressure zone. Therefore, in horizontal
venting applications they must be on the same side of the
house within the parameters as shown.
NOTE: The 18" (45.7 cm) dimension shown in “Direct Vent
Counterflow—Horizontal Venting” is the minimum
recommended height for extremely cold areas. In these
areas, moisture in the flue gases may condense and freeze on
the air intake if this height is reduced. In milder climates, this
may be reduced to a minimum of 6" (15.2 cm). Height may be
increased as needed provided total length is not exceeded.
Direct Vent—Counterflow (Vertical Venting)
B
C
D
A
C
A
B
E
D
E
F
G
H
M
L
59.69/56.64
THRU.
K
J
I
F
H
Overhead View
G
I
59.69/56.64
THRU.
■
B
D
J
F
A. Run pitch = ¹⁄₄" (6.4 mm)
per foot minimum
B. Optional piece
C. Flue pipe screen (inside
flue pipe)
D. Flue pipe
E. 18" (45.7 cm)
F. Air intake pipe
G. 6" (15.2 cm)
H. 12" (30.5 cm) minimum clearance.
Adjust height to expected snow
level based on local conditions.
I. Wall
J. 3" (7.6 cm) minimum to 48"
(121.9 cm) maximum
K. Condensate collar
L. Air intake pipe
M PVC collars
A. Flue pipe screen (inside flue pipe)
B. 24" (61 cm) minimum to roof or 12" (30.5 cm)
minimum clearance. Adjust height to
expected snow level based on local
conditions.
C. 6¹⁄₂" (16.5 cm) minimum to 24" (61 cm)
maximum
D. Storm collars
■
E. Flashing
F. Air intake pipe
G. Condensate collar
H. PVC collars
I. Flue pipe
J. Run pitch = ¹⁄₄"
(6.4 mm) per foot
minimum
The 45,000 and 67,000 Btu/h models contain an inlet air
assembly that uses two 22.5° elbows that attach separately
from the straight inlet pipe, as shown. This allows the inlet
pipe assembly to be removed if needed for service.
15
Inlet Air Assembly—45,000 & 67,000 Btu/h Furnaces
A
B
NOTE: The vent for this appliance shall not terminate over public
walkways, or near soffit vents or crawl space vents or other areas
where condensate or vapor could create a nuisance or hazard or
cause property damage, or where condensate vapor could cause
damage or could be detrimental to the operation of regulators,
relief valves, or other equipment.
C
A. Straight inlet pipe
B. 22.5° elbows
C. Burner box
Nondirect Vent Installation—Counterflow Models
■
■
■
Refer to appropriate tables for proper pipe size, vent length
and the number of elbows allowed.
Refer to “Materials” in “Plan Vent System” for the proper
venting material.
An inlet air restrictor plate found in the plastic bag containing
these Installation Instructions and the Use and Care Guide
must be installed in all nondirect vent installations.
Nondirect Vent—Counterflow (Horizontal Venting)
■
See “Inlet Air Restrictor Plate” in “Venting Requirements.”
Attach a 90° elbow (not supplied) to the inlet coupler and
install the inlet air restrictor plate inside the elbow.
The flue pipe screen, designed to keep objects out of the flue
pipe (see “Flue Pipe Screen” in “Venting Requirements”),
should be installed at the termination of the flue pipe.
Nondirect Vent—Counterflow (Vertical Venting)
B
A
C
A
B
C
D
D
E
I
F
H
59.69/56.64
THRU.
G
I
J
E
H
A. Inlet coupler
B. Run pitch = ¹⁄₄" (6.4 mm) per foot minimum
C. Flue pipe screen (inside flue pipe)
D. 6" (15.2 cm)
E. 12" (30.5 cm) minimum clearance. Adjust
height to expected snow level based on
local conditions.
F. Inlet air restrictor plate
(inside intake pipe or
elbow)
G. Condensate collar
H. Flue pipe
I. PVC collars
F
G
A. 24" (61 cm) minimum to roof or 12" (30.5 cm)
F. Air intake pipe
minimum clearance. Adjust height to expected G. Condensate collar
snow level based on local conditions.
H. PVC collars
B. Flue pipe screen inside flue pipe)
I. Flue pipe
C. Storm collar
J. Run pitch = ¹⁄₄"
D. Flashing
(6.4 mm) per foot
minimum
E. Inlet air restrictor plate (inside intake pipe or
elbow)
16
■
The 45,000 and 67,000 Btu/h models contain an inlet air
assembly that uses two 22.5° elbows that attach separately
from the straight inlet pipe, as shown. This allows the inlet
pipe assembly to be removed if needed for service.
Inlet Air Assembly—45,000 & 67,000 Btu/h Units
A
B
C
A. Straight inlet pipe
B. 22.5° elbows
C. Burner box
Install Ductwork
IMPORTANT:
■ Install ductwork 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 avoid a negative pressure on the venting
system.
Installation with Return Ducts
A return air duct system is recommended. If the furnace 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
When an air conditioning furnace 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.
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
leakproof.
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.
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.
17
Typical filter sizes are shown; however, any combination of filters whose area equals or exceeds the minimum area shown is
satisfactory.
■
Minimum Filter Requirements Chart
Disposable Filters
Cleanable Filters
Airflow
Descriptor
Minimum Area—
sq. in. (cm2)
Size—in. (cm)
Quantity
Minimum Area—
sq. in. (cm2)
Size—in. (cm)
Quantity
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.
■
■
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
WARNING
5. Using UL listed wire connectors, connect the field supply
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
“Troubleshooting.”
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.
18
WARNING
A
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
B
A. Connect white to white and black to black
B. Green ground screw
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.
7. Replace the furnace electrical connection box cover and
screw.
A
B
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® tape.
A
B
C
D
E
F
G
A. ¹⁄₈" (3.2 mm) NPT plugged tap
B. Manual gas shutoff valve
C. Ground joint union
D. Tee
E. Sediment trap
F. Cap
G. Gas control valve
(inside furnace)
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.
19
Check the Furnace Input Rate (if required)
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. (1st stage) and 3.5" (8.89 cm) W.C.
(2nd 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. (1st stage) and 10.0" (25.4 cm) W.C.
(2nd stage) for propane gas.
■
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
=
Cu. ft per Revolution
x 3600 x Heating
Value
# Seconds per Revolution
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.”
■
Adjust the Furnace Input Rate (if required)
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. Turn 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
B
G
C
F
ON
9. Refer to the Manifold Pressure vs. Altitude Chart later in this
section for the correct manifold pressure. If necessary, turn
the regulator adjusting screw clockwise to increase pressure
and input, or counterclockwise to decrease pressure and
input.
NOTE: The pressure regulator adjustment is sensitive; one
turn of the adjusting screw will result in a large change in
manifold pressure.
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" 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.
Manifold Pressure vs. Altitude Chart for Natural Gas
Altitude—ft (m)
Manifold
Heating Value Pressure
(Btu/ft3)
(in. W.C.)
Input
Factor
2,000 (609.6)
948
3.5
0.9666
3,000 (914.4)
914
3.5
0.9499
4,000 (1,219.2)
881
3.5
0.9332
4,500 (1,371.6)
865
3.5
0.9249
5,000 (1,524)
849
3.29
0.89
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.
5,500 (1,676.4)
833
3.27
0.879
6,000 (1,828.8)
818
3.25
0.868
6,500 (1,981.2)
802
3.23
0.857
7,000 (2,133.6)
787
3.21
0.846
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.
7,500 (2,286)
771
3.19
0.835
OFF
D
E
A. Regulator adjusting cap
B. ¹⁄₈" (3.2 mm) NPT outlet
pressure tap
C. ¹⁄₂" (1.3 cm) NPT outlet
D. Gas control
E. Alternate gas control
F. ¹⁄₈" (3.2 mm) NPT inlet pressure tap
G. ¹⁄₂" (1.3 cm) NPT inlet
For Altitudes 7,500 to 10,000 ft (2,286 m to 3,048 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).
20
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.
3. If furnace doesn't maintain temperature rise within the range
shown on the furnace rating plate, adjust the blower speed.
Adjust Blower Speed
WARNING
Measure Temperature Rise
1. Adjust the 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" [1.8 m]
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
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.
NOTE: See the wiring diagrams in the “Troubleshooting” section
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 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.
D
A. Measure return air here.
B. Warm air
C. Measure supply temperature here.
D. Return air
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 control(s) to the lowest setting.
2. Disconnect power.
3. Remove burner access panel.
4. Turn off the gas supply at the manual gas shutoff valve.
5. Replace the burner access panel.
21
SEQUENCE OF OPERATION
Heating Cycle
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 a 7-second warm-up time, the control energizes the
main gas valve, causing the main burners to ignite. The hot
surface igniter is de-energized 3 seconds after the main valve
opens. 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.
Fan On Cycle
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.
22
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.
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.
Cooling Cycle
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.
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.
CONTROLS
Pressure Switch(s)
Ignition Control Board
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.
WARNING
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.
Auxiliary Limit Control (on some models)
This is a normally closed control, located on the circulating air
blower housing, that opens under abnormal “reverse airflow”
conditions that could occur in a counterflow or horizontal
installation if the circulating air blower fails. 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.
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 on the “Troubleshooting” section.
Gas Control Valve
The gas control valve regulates the manifold gas pressure and
provides gas flow.
23
TROUBLESHOOTING
Furnace Fails to Operate Properly
Review “Sequence of Operation” and visually inspect the
following before troubleshooting:
Failure Codes
Disconnect power before servicing.
The furnace has a built-in, self-diagnostic capability. If a system
problem occurs, a failure code is indicated by the LED on the
ignition control board. The control continuously monitors its own
operation and the operation of the system. If a failure occurs, the
LED will indicate the failure code.
IMPORTANT: Do not remove the blower compartment door or
turn off the power to the furnace since either action will clear the
control’s memory of the fault.
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.
Replace all parts and panels before operating.
Failure Codes Chart
Failure to do so can result in death or electrical shock.
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 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
WARNING
Electrical Shock Hazard
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 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 push-button
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 push-button switch in for more than 5 seconds
before releasing.
24
Wiring Connection Diagram—Honeywell® VR 8205 System
Hot Surface Igniter
Line Voltage - Factory
Line Voltage - Field
Low Voltage - Factory
Low Voltage - Field
G
W
BK
Interlock
Switch
Circulation
Blower
W (Neutral)
R (Lo)
OR (Med/Lo)
BU (Med)
Y (Med/Hi)
BK (Hi)
Induced
Draft
Blower
*Not on all models
W
BK/W Stripe
Y
Y/BK Stripe
R
Transformer
BK
W
If Used
OR
OR
HUM
L1
XFMR
CONT
EAC
COOL
HEAT
NEUTRALS
Y
W
Y
BK
Rollout
Switch
PARK
PARK
PARK
5A Fuse
W
BR
R CW Y G
60
90
120
180
TWIN
V
SW1
Blower Off
Delay Timing
(See NOTE 3)
Aux
Limit
Switch
Thermostat & Subbase
Heat Anticipator
0.60 Amp
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.
Flame
Sensor
GY
Fault Code
History
Button
(See NOTE 1)
60
90
120
180
MV
MV
Gas
Control
Valve
OR
Rollout
Switch
BU
High
Limit Switch
V
V
Aux
Limit
Switch
If Used
Pressure
Switch
(if used)
Pressure
Switch
Condenser
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.
25
Wiring Schematic—Honeywell® VR 8205 System
120 / 1 / 60
Interlock
Switch
Neutrals
Hot Surface Igniter
Neutrals
Humidifier
Neutrals
Induced Draft Blower
Neutrals
Air Cleaner
Heat
Neutrals
Cool
Blower Motor
Neutrals
120 VAC
Transformer
24 VAC
Pin 3
Pin 6
If Used
Flame Sensor
Pin 2
Pin 5
Pin 12
Pin 11
Pin 9
Pin 1
Pin 8
Pin 7
Rollout Switch
Rollout Switch
Gas Control Valve
Limit Switch
If Used
Pin 4
Pin 10
Aux Limit Switch
Condenser
Thermostat
26
Aux Limit Switch
Pressure Switch
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
14610 Breakers Drive
Jacksonville, FL 32258
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.
ALPKT572-3 Natural Gas to Propane Conversion Kit
ALPKT574-2 Natural Gas to Propane Conversion Kit
WAFILTHA7-2 Filter Frame Kit
AFILT524-1
Side Return Filter Kit
AFILT529-1
Bottom Return Filter Kit
WABASE512 Combustible Floor Base (17¹⁄₂" [44.5 cm] cabinets)
WABASE568 Combustible Floor Base (21" [57.4 cm] cabinets)
WABASE569 Combustible Floor Base (24¹⁄₂" [62.3 cm] cabinets)
27
46948B008
© 2008. All rights reserved.
Honeywell is a trademark of Honeywell International, Inc.
®Registered Trademark/TM Trademark of Whirlpool, U.S.A.,
Manufactured under license by Tradewinds Distributing Company, LLC., Coconut Grove, Florida
3/08
Printed in U.S.A.