93% AND 95% 2-STAGE VARIABLE SPEED GAS FURNACE
INSTALLATION INSTRUCTIONS
ATTENTION INSTALLATION PERSONNEL
As a professional installer, you have an obligation to know the product better than the customer. This includes all
safety precautions and related items. Prior to actual installation, thoroughly familiarize yourself with this instruction
manual. Pay special attention to all safety warnings. Often during installation or repair, it is possible to place
yourself in a position which is more hazardous than when the unit is in operations.
Remember, it is your responsibility to install the product safely and to know it well enough to be able to instruct a
customer in its safe use. Safety is a matter of common sense...a matter of thinking before acting. Most dealers have
a list of specific good safety practices...follow them.
The precautions listed in this installation manual are intended as supplemental to existing practices. However, if
there is a direct conflict between existing practices and the content of this manual, the precautions listed here take
precedence.
Whirlpool Gold® Models
WGFD293, WGFM295
WPIO-368
Whirlpool® Home Cooling and Heating
14610 Breakers Drive
Jacksonville, Florida 32258
Table of Contents
GAS FURNACE SAFETY PRECAUTIONS ....................................3
PRODUCT DESCRIPTION AND APPLICATION ..........................4
Shipping Inspection .....................................................................4
Electrostatic Discharge (ESD) ......................................................4
To The Installer.............................................................................4
Important Note to the Owner Regarding Product Warranty .......4
Product Application......................................................................5
LOCATION REQUIREMENTS AND CONSIDERATIONS ............6
Clearances and Accessibility .......................................................7
Furnace Suspension ....................................................................7
Existing Furnace Removal ...........................................................7
Thermostat Location ....................................................................7
Combustion and Ventilation Air Requirements ...........................8
HORIZONTAL APPLICATIONS AND CONSIDERATIONS..........8
Drain Trap and Lines ....................................................................9
Leveling ........................................................................................9
Alternate Vent/Flue Connections .................................................9
Alternate Electrical and Gas Line Connections ...........................9
Drain Pan......................................................................................9
Freeze Protection .........................................................................9
Furnace Suspension ....................................................................9
PROPANE GAS/HIGH ALTITUDE INSTALLATIONS .................10
VENT/FLUE PIPE AND COMBUSTION AIR PIPE......................10
Dual Certification: Nondirect/Direct Vent...................................10
Materials and Joining Methods..................................................11
Proper Vent/Flue and Combustion Air Piping Practices ...........11
Termination Locations................................................................11
Canadian Venting Requirements ...............................................11
Standard Furnace Connections.................................................11
Vent/Flue Pipe ............................................................................11
Combustion Air Pipe—Direct Vent Installations ........................12
Combustion Air Pipe—Nondirect Vent Installations..................12
Alternate Furnace Connections .................................................13
Alternate Vent/Flue Location......................................................13
Alternate Combustion Air Intake Location.................................14
Nondirect Vent (Single Pipe) Piping...........................................15
Nondirect Vent Applications ......................................................15
Vent/Flue Pipe Terminations ......................................................16
Direct Vent (Dual Pipe) Piping ....................................................17
Vent/Flue and Combustion Air Pipe Lengths and Diameters....17
Vent/Intake Terminations for Installation of
Multiple Direct Vent Furnaces....................................................19
Concentric Vent Termination .....................................................20
Side Wall Vent Kit.......................................................................20
CONDENSATE DRAIN LINES AND DRAIN TRAP .....................20
Standard Right or Left Side Drain Hose Connections...............20
Upright Installations—Trap on Right Side .................................20
Upright Installations—Trap on Left Side....................................21
Upright Drain Trap Mounting—Left or Right Side Panel ...........22
Horizontal Installations—Right Side Down................................22
Horizontal Installations—Left Side Down ..................................23
Horizontal Drain Trap Mounting—Left or Right Side Panel.......23
ELECTRICAL CONNECTIONS ....................................................23
Wiring Harness ...........................................................................23
115-Volt Line Connections.........................................................24
Junction Box Relocation............................................................24
24-Volt Thermostat Wiring .........................................................24
24-Volt Dehumidistat Wiring ......................................................25
Fossil Fuel Applications .............................................................26
2
115-Volt Line Connection of Accessories (Humidifier and
Electronic Air Cleaner)................................................................26
GAS SUPPLY AND PIPING..........................................................26
High Altitude Derate ...................................................................27
Propane Gas Conversion ...........................................................27
Gas Control Valve.......................................................................27
Gas Piping Connections ............................................................27
Gas Piping Checks.....................................................................29
Propane Gas Tanks and Piping .................................................29
CIRCULATING AIR AND FILTERS ..............................................31
Ductwork—Airflow .....................................................................31
Bottom Return Air Opening—Upflow Models] ..........................31
Filters—Read This Section Before Installing the Return Air
Ductwork ....................................................................................32
START-UP PROCEDURE AND ADJUSTMENT .........................33
Heat Anticipator Setting .............................................................33
Drain Trap Priming......................................................................33
Furnace Operation......................................................................33
Furnace Start-up ........................................................................33
Furnace Shutdown .....................................................................34
Gas Supply Pressure Measurement ..........................................34
Gas Manifold Pressure Measurement and Adjustment.............35
Gas Input Rate Measurement—Natural Gas Only.....................36
Temperature Rise .......................................................................36
Circulator Blower Speeds ..........................................................36
Blower Heat Off Delay Timings ..................................................39
NORMAL SEQUENCE OF OPERATION .....................................39
Power Up....................................................................................39
Heating Mode.............................................................................39
Cooling Mode .............................................................................39
Fan Only Mode ...........................................................................40
Operational Checks....................................................................40
SAFETY CIRCUIT DESCRIPTION ...............................................40
Integrated Control Module .........................................................40
Primary Limit Control..................................................................40
Auxiliary Limit Controls...............................................................40
Rollout Limit Controls.................................................................40
Pressure Switches......................................................................40
Flame Sensor..............................................................................40
MAINTENANCE ............................................................................41
Annual Inspection.......................................................................41
Filters ..........................................................................................41
Burners .......................................................................................41
Induced Draft and Circulator Blowers........................................41
Condensate Trap and Drain System (Qualified Servicer Only)..41
Flame Sensor (Qualified Servicer Only)......................................41
Flue Passages (Qualified Servicer Only) ....................................41
Before Leaving an Installation....................................................42
Repair and Replacement Parts ..................................................42
TROUBLESHOOTING ..................................................................42
Electrostatic Discharge (ESD) Precautions................................42
Fault Recall .................................................................................42
Resetting from Lockout..............................................................43
Status Codes..............................................................................43
Diagnostic Chart.........................................................................43
WIRING DIAGRAM .......................................................................50
ASSISTANCE OR SERVICE .........................................................51
GAS FURNACE SAFETY PRECAUTIONS
Please adhere to the following warnings and cautions when installing, adjusting, altering, servicing or operating the furnace. To ensure
proper installation and operation, thoroughly read this manual for specifics pertaining to the installation and application of this product.
Recognize this symbol as a safety precaution.
WARNING
Hazards or unsafe practices could result in property
damage, product damage, severe personal injury or death.
CAUTION
Hazards or unsafe practices may result in property
damage, product damage, personal injury or death.
WARNING
The manufacturer will not be responsible for any injury
or property damage arising from improper service or
service procedures. If you install or perform service on
this unit, you assume responsibility for any personal
injury or property damage which may result. Many
jurisdictions require a license to install or service
heating and air conditioning equipment.
WARNING
WARNING
This product contains or produces a chemical or
chemicals which may cause serious illness or death and
which are known to the State of California to cause
cancer, birth defects or other reproductive harm.
WARNING
Heating unit should not be utilized without reasonable,
routine inspection, maintenance and supervision. If the
building in which any such device is located will be
vacant, care should be taken that such device is
routinely inspected, maintained and monitored. In the
event that the building may be exposed to freezing
temperatures and will be vacant, all water-bearing pipes
should be drained, the building should be properly
winterized and the water source closed. In the event
that the building may be exposed to freezing
temperatures and will be vacant, any hydronic coil units
should be drained as well, and, in such case, alternative
heat sources should be utilized.
DANGER
To prevent personal injury or death due to improper
installation, adjustment, alteration, service or maintenance,
refer to this manual. For additional assistance or
information, consult a qualified installer, service agency
or the gas supplier.
WARNING
If the information in these instructions is not followed
exactly, a fire or explosion may result causing property
damage, personal injury or loss of life.
— 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.
• 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.
CARBON MONOXIDE POISONING HAZARD
Special Warning for Installation of Furnace or Air Handling
Units in Enclosed Areas such as Garages, Utility Rooms or
Parking Areas.
Carbon monoxide producing devices (such as an
automobile, space heater, gas water heater, etc.) should
not be operated in enclosed areas such as unventilated
garages, utility rooms or parking areas because of the
danger of carbon monoxide (CO) poisoning resulting from
the exhaust emissions. If a furnace or air handler is
installed in an enclosed area such as a garage, utility room
or parking area and a carbon monoxide producing device is
operated therein, there must be adequate, direct outside
ventilation.
This ventilation is necessary to avoid the danger of CO
poisoning which can occur if a carbon monoxide producing
device continues to operate in the enclosed area. Carbon
monoxide emissions can be (re)circulated throughout the
structure if the furnace or air handler is operating in any
mode.
CO can cause serious illness including permanent brain
damage or death.
3
WARNING
Should overheating occur or the gas supply fail to shut
off, turn off the manual gas shutoff valve external to the
furnace before turning off the electrical supply.
WARNING
Possible property damage, personal injury or death due
to fire, explosion, smoke, soot, condensation, electrical
shock or carbon monoxide may result from improper
installation, repair, operation or maintenance of this
product.
PRODUCT DESCRIPTION AND APPLICATION
Shipping Inspection
All units are securely packed in shipping containers tested
according to International Safe Transit Association specifications.
The carton must be checked upon arrival for external damage. If
damage is found, a request for inspection by carrier’s agent must
be made in writing immediately.
The furnace must be carefully inspected on arrival for damage
and bolts or screws which may have come loose in transit. In the
event of damage, the consignee should:
1. Make a notation on the delivery receipt of any visible damage
to the shipment or container.
2. Notify the carrier promptly and request an inspection.
3. With concealed damage, the carrier must be notified as soon
as possible—preferably within 5 days.
4. File the claim with the following support documents within a
9-month statute of limitations.
■ Original or certified copy of the Bill of Lading, or
indemnity bond.
■ Original paid freight bill or indemnity in lieu thereof.
■ Original or certified copy of the invoice, showing trade
and other discounts or reductions.
■ Copy of the inspection report issued by carrier’s
representative at the time damage is reported to carrier.
The carrier is responsible for making prompt inspection of the
damage and for a thorough investigation of each claim. The
distributor or manufacturer will not accept claims from dealers for
transportation damage.
Electrostatic Discharge (ESD)
NOTE: Discharge static electricity accumulated in the body
before touching the unit. An electrostatic discharge can adversely
affect electrical components.
Use the following steps during furnace installations and servicing
to protect the integrated control module from damage. By putting
the furnace, the control and the person at the same electrostatic
potential, these steps will help avoid exposing the integrated
control module to electrostatic discharge. This procedure is
applicable to both installed and noninstalled (ungrounded)
furnaces.
1. Disconnect all power to the furnace.
NOTE: Do not touch the integrated control module or any
wire connected to the control prior to discharging your body’s
electrostatic charge to ground.
2. Firmly touch a clean, unpainted, metal surface of the furnace
away from the control. Any tools held in a person’s hand
during grounding will be discharged also.
3. Service the integrated control module or connecting wiring
after following the discharge process in Step 2.
4
NOTE: Do not recharge your body with static electricity by
moving or shuffling your feet or touching ungrounded
objects. If you touch an ungrounded object, repeat Step 2
before touching the control or wires.
4. Follow steps 1 through 3 before removing a new control from
its container or installing the control on a furnace. Return any
old or new controls to their containers before touching any
ungrounded object.
To The Installer
Before installing this unit, please read this manual thoroughly to
familiarize yourself with specific items which must be adhered to,
including, but not limited to:
■ Unit maximum external static pressure
■ Gas pressures
■ Btu input rating
■ Proper electrical connections
■ Circulating air temperature rise
■ Minimum or maximum CFM
■ Motor speed connections
Important Note to the Owner Regarding
Product Warranty
Your warranty certificate is supplied as a separate document with
the unit installed by your contractor. Read the limited warranty
certificate carefully to determine what is and is not covered. Keep
the warranty certificate in a safe place. If you are unable to locate
the warranty certificate, please contact your installing contractor,
or contact customer service at 877-254-4729 to obtain a copy.
To register your unit, go to www.goodmanmfg.com. Click on the
Warranty link located on the left side of the home page. Next,
click on the Product Registration link located on the left side of
the Warranty page, and complete the forms in the manner
indicated on the Product Registration page.
To register your Amana brand unit, go to www.amana-hac.com.
Click on the Warranty link located on the top right side of the
home page. Next, click on the Product Registration link located
on the left side of the Warranty page, and complete the forms in
the manner indicated on the Product Registration page.
To receive the Lifetime Heat Exchanger Limited Warranty and the
10-Year Parts Limited Warranty, online registration must be
completed within 60 days of installation. Online registration is not
required in California or Quebec.
Product limited warranty certificates can be viewed at
www.goodmanmfg.com or www.amana-hac.com. Each product
overview page contains a Product Warranty link. By clicking on
the link, you will be able to view the limited warranty coverage for
that specific product. To view warranty registration information,
click on the Product Warranty link on the left navigation panel on
the home page of each website. The Online Product Registration
pages are located in this same section.
WARNING
To prevent property damage, personal injury or death due
to fire, do not install the furnace in a mobile home, trailer
or recreational vehicle.
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Product Application
This furnace is primarily designed for residential home-heating
applications.
IMPORTANT:
■ This furnace is not designed or certified for use in mobile
homes, trailers or recreational vehicles.
■ This furnace is not designed or certified for outdoor
applications.
■ The furnace must be installed indoors (for example, attic
space, crawl space or garage area provided the garage area
is enclosed with an operating door).
This furnace can be used in the following nonindustrial
commercial applications:
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Schools
Office buildings
Churches
Retail stores
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Nursing homes
Hotels/motels
Common areas
Office areas
NOTE: In such applications, the furnace must be installed with
the following stipulations:
■ It must be installed according to the installation instructions
provided and according to local and national codes.
■ It must be installed indoors in a building constructed on site.
■ It must be part of a ducted system and not used in a free air
delivery application.
■ It must not be used as a “makeup” air unit.
■ It must be installed with 2-pipe systems for combustion air,
especially if VOC’s or other contaminants are present in the
conditioned space.
■ All other warranty exclusions and restrictions apply.
This furnace is an ETL dual-certified appliance and is appropriate
for use with natural or propane gas
NOTE: If you are using propane, a propane conversion kit is
required.
Dual certification means that the combustion air inlet pipe is
optional, and the furnace can be vented as a:
■ Nondirect vent (single pipe) central forced air furnace in
which combustion air is taken from the installation area or
from air ducted from the outside or a,
■ Direct vent (dual pipe) central forced air furnace in which all
combustion air supplied directly to the furnace burners
through a special air intake system outlined in these
instructions.
This furnace may be used as a construction site heater only if all
of the following conditions are met:
■ The vent system is permanently installed according to these
installation instructions.
A room thermostat is used to control the furnace. Fixed
jumpers that provide continuous heating cannot be used and
can cause long term equipment damage.
Return air ducts are provided and sealed to the furnace.
A return air temperature range between 60ºF (16ºC) and 80ºF
(27ºC) is maintained.
Air filters are installed in the system and maintained during
construction, replaced as appropriate during construction
and upon completion of construction.
The input rate and temperature rise are set according to the
furnace rating plate.
100% outside air is provided for combustion air requirements
during construction. Temporary ducting can be used.
NOTE: Do not connect the temporary duct directly to the
furnace. The duct must be sized for adequate combustion
and ventilation in accordance with the latest edition of the
National Fuel Gas Code NFPA 54/ANSI Z223.1 or CAN/CSA
B149.1 Installation Codes.
The furnace heat exchanger, components, duct system, air
filters and evaporator coils are thoroughly cleaned following
the final construction cleanup.
■ All furnace operating conditions (including ignition, input rate,
temperature rise and venting) are verified according to these
installation instructions.
NOTE: The Commonwealth of Massachusetts requires that the
following additional requirements must also be met:
■ Gas furnaces must be installed by a licensed plumber or gas
fitter.
■ A T-handle gas cock must be used.
■ If the unit is to be installed in an attic, the passageway to and
the service area around the unit must have flooring.
To ensure proper furnace operation, you must install, operate and
maintain the furnace in accordance with these installation and
operation instructions, all local building codes and ordinances. In
their absence, follow the latest edition of the National Fuel Gas
Code (NFPA 54/ANSI Z223.1), and/or CAN/CSA B149 Installation
Codes, local plumbing or waste water codes and other
applicable codes.
A copy of the National Fuel Gas Code (NFPA 54/ANSI Z223.1)
can be obtained from any of the following:
American National Standards Institute
1430 Broadway
New York, NY 10018
■
National Fire Protection Association
1 Batterymarch Park
Quincy, MA 02269
CSA International
8501 East Pleasant Valley
Cleveland, OH 44131
The rated heating capacity of the furnace should be greater than
or equal to the total heat loss of the area to be heated. The total
heat loss should be calculated by an approved method or in
accordance with “ASHRAE Guide” or “Manual J-Load
Calculations” published by the Air Conditioning Contractors of
America.
A copy of the CAN/CSA B149 Installation Codes can also be
obtained from:
CSA International
178 Rexdale Boulevard
Etobicoke, Ontario, Canada M9W 1R3
5
LOCATION REQUIREMENTS AND CONSIDERATIONS
Follow the instructions listed below when selecting a furnace
location. Refer also to the guidelines provided in “Combustion
and Ventilation Air Requirements.”
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WARNING
Goodman 50
To prevent possible equipment damage, property damage,
personal injury or death, the following bullet points must
be observed when installing the unit.
WARNING
Possible property damage, personal injury or death due
to fire, explosion, smoke,
soot, condensation,
electrical
Goodman
48
shock or carbon monoxide may result from improper
installation, repair, operation or maintenance of this
product.
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6
Centrally locate the furnace with respect to the proposed or
existing air distribution system.
Check that the temperature of the return air entering the
furnace is between 55°F and 100°F (12.8ºC and 37.8ºC) when
the furnace is heating.
Provide provisions for venting combustion products outdoors
through a proper venting system. Special consideration
should be given to the vent/flue pipe routing and the
combustion air intake pipe when applicable. Refer to
“Termination Locations” in “Vent/Flue Pipe and Combustion
Air Pipe” for appropriate termination locations and to
determine if the piping system from the furnace to the
termination can be accomplished within the guidelines given.
NOTE: The length of flue and/or combustion air piping can be
a limiting factor in the location of the furnace.
Locate the furnace so that the condensate flows downward
to the drain.
NOTE: Do not locate the furnace or its condensate drainage
system in any area subject to below freezing temperatures
without the proper freeze protection. Refer to “Condensate
Drain Lines and Trap” for further details.
Check that adequate combustion air is available for the
furnace. Improper or insufficient combustion air can expose
building occupants to gas combustion products that could
include carbon monoxide. Refer to “Combustion and
Ventilation Air Requirements.”
Set the furnace on a level floor to enable proper condensate
drainage. If the floor becomes wet or damp at times, place
the furnace above the floor on a concrete base sized
approximately 1¹⁄₂" (3.8 cm) larger than the base of the
furnace. Refer to “Horizontal Applications and
Considerations” for leveling of horizontal furnaces.
Check that the upflow or horizontal furnaces are not installed
directly on carpeting, or any other combustible material.
NOTE: The only combustible material allowed is wood.
A special accessory subbase must be used for the upright
counterflow unit installations over any combustible material
(including wood). Refer to subbase instructions for installation
details.
NOTE: A subbase will not be required if an air conditioning
coil is located beneath the furnace between the supply air
opening and the combustible floor.
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Exposure to contaminated combustion air will result in safety
and performance-related problems.
NOTE: Do not install the furnace where the combustion air is
exposed to the following substances:
Chlorinated waxes or cleaners
Chlorine-based swimming pool chemicals
Water softening chemicals
Deicing salts or chemicals
Carbon tetrachloride
Halogen-type refrigerants
Cleaning solutions (such as perchloroethylene)
Printing inks
Paint removers
Varnishes
Hydrochloric acid
Cements and glues
Antistatic fabric softeners for clothes dryers
Masonry acid washing materials
Seal off a nondirect vent furnace if it is installed near an area
frequently contaminated by any of the above substances.
This protects the nondirect vent furnace from airborne
contaminants. To ensure that the enclosed nondirect vent
furnace has an adequate supply of combustion air, vent from
a nearby uncontaminated room or from outdoors. Refer to
“Combustion and Ventilation Air Requirements” for details.
If the furnace is used in connection with a cooling coil unit,
install the furnace upstream or in parallel with the cooling coil
unit. Premature heat exchanger failure will result if the cooling
coil unit is placed ahead of the furnace.
If the furnace is installed in a residential garage, position the
furnace so that the burners and ignition source are located
not less than 18" (45.7 cm) above the floor. Protect the
furnace from physical damage by vehicles.
If the furnace is installed horizontally, ensure the furnace
access doors are not on the “up/top” or “down/bottom” side
of the furnace.
Do not connect the furnace to a chimney flue that serves a
separate appliance designed to burn solid fuel.
On counterflow installations, the air conditioning coil must be
downstream on the supply (positive) side of the furnace heat
exchanger.
Counterflow Installation Over a Noncombustible Floor
■
Before setting the furnace over the plenum opening, ensure
that the surface around the opening is smooth and level. A
tight seal should be made between the furnace base and
floor by using a silicone rubber caulking compound or
cement grout.
Counterflow Installation Over a Combustible Floor
■
If installation over a combustible floor becomes necessary, use
an accessory subbase (see Specification Sheet applicable for
your model for details). A special accessory subbase must be
used for upright counterflow unit installations over any
combustible material including wood. Refer to subbase
instructions for installation details. Follow the instructions with
the subbase for proper installation.
NOTES:
■ Do not install the furnace directly on carpeting, tile or
other combustible material other than wood flooring.
■ The subbase will not be required if an air conditioning coil
is installed between the supply air opening on the furnace
and the floor.
Clearances and Accessibility
Existing Furnace Removal
Installations must adhere to the clearances to combustible
materials to which this furnace has been design-certified. The
minimum clearance information for this furnace is provided on
the unit’s clearance label. These clearances must be permanently
maintained. Clearances must also accommodate an installation’s
gas, electrical, drain trap and drain line connections. If the
alternate combustion air intake or vent/flue connections are
used, additional clearance must be provided to accommodate
these connections. Refer to “Vent/Flue Pipe and Combustion Air
Pipe” for details.
NOTE: In addition to the required clearances to combustible
materials, a minimum of 24" (61 cm) service clearance must be
available in front of the unit.
NOTE: When an existing furnace is removed from a venting
system serving other appliances, the venting system may be too
large to properly vent the remaining attached appliances.
The following vent testing procedure is reproduced from the
American National Standard/National Standard of Canada for
Gas-Fired Central Furnaces ANSI Z21.4, CSA-2.3 latest edition
Section 1.23.1.
The following steps shall be followed with each appliance
connected to the venting system placed in operation, while any
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 by the National Fuel Gas Code, ANSI
Z223.1 or the Natural Gas and Propane Installation Code,
CSA B149.1-05 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 shall operate at
maximum speed. Do not operate a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance being
inspected in operation. Adjust thermostat so appliance shall
operate continuously.
7. Test for leaking from draft hood appliances at the draft hood
relief opening after 5 minutes of main burner operation. Use
the flame of a match or candle.
8. 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 burning appliance to their
previous conditions of use.
9. 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
National Gas and Propane Installation Code CSA B149.1-05.
If resizing is required on any portion of the venting system, use
the appropriate table in Appendix G in the latest edition of the
National Fuel Gas Code ANSI Z223.1 and/or CSA B149.1-05
Installation Codes.
A
A
B
B
B
Upflow
C
C
Counterflow
A. Top
B. Side
Horizontal
C. Bottom
A furnace installed in a confined space (for example, a closet or
utility room) must have 2 ventilation openings with a total
minimum free area of 0.25 sq. in. per 1,000 Btu/h of furnace input
rating. Refer to the Specification Sheet applicable to your model
for minimum clearances to combustible surfaces. One of the
ventilation openings must be within 12" (30.5 cm) of the top. The
other opening must be within 12" (30.5 cm) of the bottom of the
confined space. In a typical construction, the clearance between
the door and door frame is usually adequate to satisfy this
ventilation requirement.
Furnace Suspension
If suspending the furnace from rafters or joists, use ³⁄₈" threaded
rod and 2" x 2" x ¹⁄₈" (5.1 cm x 5.1 cm x 3.2 mm) angle iron as
shown in “Suspended Furnace” illustration. The length of rod will
depend on the application and the clearances necessary.
Suspended Furnace
B
A
C
H
Thermostat Location
G
F
E
A. ³⁄₈" (1 cm) diameter threaded
rod (6)
B. 8" (20.3 cm) minimum clearance
between center rod and furnace
cabinet to allow for circulator
blower removal.
C. Level furnace end to end, slight
forward tilt with front 0" to ³⁄₄"
(1.9 cm) below back.
D
D. Tilt outward to allow for door and
circulator blower removal.
E. Position as close as possible to
blower deck to allow for
circulator blower removal.
F. 2" x 2" x ¹⁄₈" (5.1 cm x 5.1 cm x
3.2 mm) angle iron (3)
G. Support nuts
H. Hold down nuts
The thermostat should be placed approximately 5 ft (1.5 m) from the
floor on a vibration-free, inside wall in an area having good air
circulation.
NOTE: Do not install the thermostat where it may be influenced
by any of the following:
■ Drafts, or dead spots behind doors, in corners or under cabinets
■ Hot or cold air from registers
■ Radiant heat from the sun
■ Light fixtures or other appliances
■ Radiant heat from a fireplace
■ Concealed hot or cold water pipes or chimneys
■ Unconditioned areas behind the thermostat, such as an outside wall
Consult the instructions packaged with the thermostat for
mounting instructions and further precautions.
7
Combustion and Ventilation Air Requirements
WARNING
To avoid property damage, personal injury or death,
sufficient fresh air for proper combustion and ventilation
of flue gases must be supplied. Most homes require
outside air be supplied into the furnace area.
Improved construction and additional insulation in buildings have
reduced heat loss by reducing air infiltration and escape around
doors and windows. These changes have helped in reducing
heating/cooling costs but have created a problem supplying
combustion and ventilation air for gas-fired and other
fuel-burning appliances. Appliances that pull air out of the house
(clothes dryers, exhaust fans, fireplaces, etc.) increase the
problem by starving appliances for air.
House depressurization can cause back drafting or improper
combustion of gas-fired appliances, thereby exposing building
occupants to gas combustion products that could include carbon
monoxide.
If this furnace is to be installed in the same space with other gas
appliances, such as a water heater, ensure there is an adequate
supply of combustion and ventilation air for the other appliances.
Refer to the latest edition of the National Fuel Gas Code NFPA
54/ANSI Z223.1 or CAN/CSA B149 Installation Codes or
applicable provisions of the local building codes for determining
the combustion air requirements for the appliances.
Most homes will require outside air to be supplied to the furnace
area by means of ventilation grilles or ducts connecting directly
to the outdoors or spaces open to the outdoors such as attics or
crawl spaces.
Installation Positions
This furnace may be installed in an upright position or horizontal
on either the left or right side panel.
NOTE: Do not install this furnace on its back.
For upright upflow furnaces, the return air ductwork may be
attached to the side panel(s) and/or base pan.
For horizontal upflow furnaces, the return air ductwork must be
attached to the base pan.
For both the upright or horizontal counterflow furnaces, the
return air ductwork must be attached to the base pan (top end of
the blower compartment).
NOTE: Do not attach the ductwork to the back of the furnace.
Contact your local distributor for the proper airflow requirements
and the number of required ductwork connections. See the
“Recommended Installation Positions” illustrations for the
appropriate installation positions, ductwork connections and the
resulting airflow arrangements.
HORIZONTAL APPLICATIONS AND CONSIDERATIONS
Horizontal applications, in particular, may dictate many of the
installation’s specifics such as airflow direction, ductwork
connections, flue and combustion air pipe connections, etc. The
basic application of this furnace as a horizontal furnace differs
only slightly from an upright installation.
When installing a furnace horizontally, additional consideration
must be given to the following:
■ Drain trap and lines
■ Leveling the furnace
■ Alternate vent/flue and combustion air connections
■ Alternate electrical and gas line connections
■ Drain pan
■ Freeze protection
■ Furnace suspension.
A
C
B
I
F
D
H
G
E
A. Alternate vent/flue location
E. 24" (61 cm) minimum service
clearance
B. Level end-to-end
F. 4³⁄₄" (12.1 cm) minimum drain trap
C. Level side-to-side or slightly
clearance
tilted—doors 0" to ³⁄₄" (1.9 cm)
below back panel
G. Supports at both ends and middle
D. Drain line—¹⁄₄" (6.4 mm) per
H. Drain pan
foot downward slope
I. Gas line with 3" (7.6 cm) minimum
drip leg
8
Recommended Installation Positions—Upright Upflow
Drain Trap and Lines
A
In horizontal applications, the condensate drain trap is secured to
the furnace side panel, suspending it below the furnace. A
minimum clearance of 4³⁄₄" (12.1 cm) below the furnace must be
provided for the drain trap. Additionally, the appropriate
downward piping slope must be maintained from the drain trap to
the drain location. Refer to “Condensate Drain Trap and Lines”
for further details. If the drain trap and drain line will be exposed
to temperatures near or below freezing, adequate measures must
be taken to avoid condensate from freezing.
B
C
C
Leveling
Leveling ensures proper condensate drainage from the heat
exchanger and induced draft blower. For proper flue pipe
drainage, the furnace must be level lengthwise from end to end.
The furnace should also be level from back to front, or have a
slight tilt with the access doors sloping downward ³⁄₄" (1.9 cm)
lower than the back panel. The slight tilt allows the heat
exchanger condensate, generated in the recuperator coil, to flow
forward to the recuperator coil front cover.
D
A. Air discharge
B. Alternate flue pipe location
Recommended Installation Positions—Horizontal
Upflow—Left Side Panel Discharge
B
Alternate Vent/Flue Connections
In horizontal installations, provisions for alternate flue and
combustion air piping are available for upflow furnaces with left
discharge and counterflow furnaces with right air discharge. This
configuration allows the flue and combustion air piping to be run
vertically through the side of the furnace. Refer to the
“Recommended Installation Positions” illustrations for further
details. The standard piping connections may also be used in
these positions. See “Vent/Flue Pipe and Combustion Air Pipe”
for details concerning the conversion to the alternate vent/flue
and combustion air connections.
When using the horizontal alternate vent configuration, you must
use the RF000142 vent drain kit. See “Alternate Flue/Vent
Location” illustration.
NOTE: Alternate vertical piping connections cannot be used
when an upflow furnace is installed with the supply air
discharging to the right, or when a counterflow furnace is
installed with the supply air discharging to the left. In either case,
use the standard flue and combustion air piping connections.
Alternate Flue/Vent Location
C. Side return duct connections
D. Bottom return duct connection
A
C
A. Air discharge
B. Alternate flue pipe location
C. Bottom return duct connection
Recommended Installation Positions—Horizontal
Upflow—Right Side Panel Discharge
B
A
A. Bottom return duct connection
B. Air discharge
A
Alternate Electrical and Gas Line Connections
B
This furnace has provisions allowing for electrical and gas line
connections through either side panel. In horizontal applications,
the connections can be made either through the top or bottom of
the furnace.
C
Drain Pan
A. Vent/Drain
B. Airflow
C. Field supplied drain hose
NOTES:
■ The field supplied drain hose is connected from the vent/
drain connection to the condensate drain line with a field
supplied connector.
■ Make a small loop in the drain hose to serve as a P-trap.
A drain pan must be provided if the furnace is installed above a
conditioned area. The drain pan must cover the entire area under
the furnace (and air conditioning coil, if applicable).
Freeze Protection
Refer to “Horizontal Applications and Conditions—Drain Trap and Lines.”
Furnace Suspension
If the furnace is installed in a crawl space, it must be suspended from
the floor joist or supported by a concrete pad.
NOTE: Never install the furnace on the ground or allow it to be
exposed to water.
Refer to “Location Requirements and Considerations—Furnace
Suspension” for further details.
9
PROPANE GAS/HIGH ALTITUDE INSTALLATIONS
WARNING
Possible property damage, personal injury or death may
occur if the correct conversion kits are not installed. The
appropriate kits must be applied to ensure safe and proper
furnace operation. All conversions must be performed by
a qualified installer or service agency.
For installations above 7,000 ft (2,133.6 m), refer to your
distributor for required kit(s).
Manifold
Pressure
Gas
Altitude
Natural
This furnace is shipped from the factory configured for Natural
gas at standard altitude. Propane gas installations require an
orifice change to compensate for the energy content difference
between Natural and propane gas.
High altitude installations may require both a pressure switch and
an orifice/spring change. These changes are necessary to
compensate for the natural reduction in the density of both the
gas fuel and the combustion air at higher altitude.
Kit
Pressure
High Low Switch
Orifice Stage Stage Change
None #43
0 to
7,000 ft
Propane (2,133.6 m) LPM- #55
03
3.5"
W.C.
1.9"
W.C.
None
10.0"
W.C.
6.0"
W.C.
None
NOTE: In Canada, gas furnaces are only certified to 4,500 ft
(1,371.6 m).
Contact the distributor for a tabular listing of appropriate
manufacturer’s kits for propane gas and/or high altitude
installations. The indicated kits must be used to insure proper
furnace operation. All conversions must be performed by a
qualified installer or service agency.
VENT/FLUE PIPE AND COMBUSTION AIR PIPE
WARNING
Failure to follow these instructions can result in bodily
injury or death. Carefully read and follow all instructions
given in this section.
WARNING
Upon completion of the furnace installation, carefully
inspect the entire flue system both inside and outside of
the furnace to assure it is properly sealed. Leaks in the
flue system can result in serious personal injury or death
due to exposure to flue products, including carbon
monoxide.
A condensing gas furnace achieves its high level of efficiency by
extracting almost all of the heat from the products of combustion
and cooling them to the point where condensation takes place.
Because of the relatively low flue gas temperature and water
condensation requirements, PVC pipe is used as venting material.
NOTES:
■ This furnace must not be connected to Type B, BW, or L vent
or vent connector, and must not be vented into any portion of
a factory-built or masonry chimney except when used as a
pathway for PVC as described later in this section.
■ Do not common vent this appliance with another appliance or
use a vent which is used by a solid fuel appliance.
■ Do not use commercially available “no hub connectors” other
than those shipped with this product.
It is the responsibility of the installer to follow the manufacturers’
recommendations and to verify that all vent/flue piping and
connectors are compatible with furnace flue products.
Additionally, it is the responsibility of the installer to ensure that all
piping and connections possess adequate structural integrity and
support to avoid flue pipe separation, shifting or sagging during
furnace operation.
10
Dual Certification: Nondirect/Direct Vent
This furnace is dual certified and may be installed as a nondirect
vent (single pipe) or direct vent (dual pipe) appliance. A nondirect
vent installation requires only a vent/flue pipe, while a direct vent
installation requires both a vent/flue pipe and a combustion air
intake pipe. Refer to the appropriate section for details
concerning piping size, length, number of elbows, furnace
connections and terminations.
WARNING
To avoid bodily injury, fire or explosion, solvent cements
must be kept away from all ignition sources (for example,
sparks, open flames and excessive heat) as they are
combustible liquids. Avoid breathing cement vapors or
contact with skin and/or eyes.
2" or 3" (5.1 cm or 7.6 cm) nominal diameter PVC Schedule
40 pipe meeting ASTM D1785, PVC primer meeting ASTM F656
and PVC solvent cement meeting ASTM D2564 specifications
must be used. Fittings must be DWV type fittings meeting ASTM
D2665 and ASTM D3311. Carefully follow the pipe
manufacturer’s instructions for cutting, cleaning and solvent
cementing of PVC.
The use of Schedule 40 PVC Cellular Core (Foam Core) plastic
pipe is also acceptable as a flue/vent and intake pipe material.
PVC primer meeting ASTM F656 and PVC solvent cement
meeting ASTM D2564 specifications must be used. Fittings must
be DWV type fittings meeting ASTM D2665 and ASTM D3311.
Carefully follow the manufactures instructions for cutting,
cleaning and solvent cementing of PVC.
The vent termination of a nondirect vent application must
terminate at least 4 ft (121.9 cm) below, 4 ft (121.9 cm)
horizontally from or 12" (30.5 cm) above any door, window or
gravity air inlet into any building.
■ The vent termination of a direct vent application must
terminate at least 12" (30.5 cm) from any opening through
which flue gases may enter a building (door, window or
gravity air inlet).
■ The vent termination of vent pipe run vertically through a roof
must terminate at least 12" (30.5 cm) above the roof line (or
the anticipated snow level) and be at least 12" (30.5 cm) from
any vertical wall (including any anticipated snow buildup).
■ A vent termination shall not terminate over public walkways
or over an area where condensate or vapor could create a
nuisance or hazard or could be detrimental to the operation
of regulators, relief valves or other equipment.
■ The combustion air intake termination of a direct vent
application should not terminate in an area which is
frequently dusty or dirty.
NOTE: In Canada, the Canadian Fuel Gas Code takes
precedence over the preceding termination restrictions.
■
Materials and Joining Methods
As an alternative to PVC pipe, primer, solvent cement and fittings,
ABS materials which are in compliance with the following
specifications may be used. 2" or 3" (5.1 cm or 7.6 cm) ABS
Schedule 40 pipe must meet ASTM D1527 and, if used in
Canada, must be CSA listed. Solvent cement for ABS to ABS
joints must meet ASTM D2235 and, if used in Canada, must be
CSA listed. The solvent cement for the PVC to ABS transition
joint must meet ASTM D3138. Fittings must be DWV type fittings
meeting ASTM D2661 and ASTM D3311 and, if used in Canada,
must be CSA listed. Carefully follow the manufacturers’
instructions for cutting, cleaning, and solvent cementing PVC
and/or ABS.
All 90° elbows must be medium radius (¹⁄₄ bend DWV) or long
radius (long sweep ¹⁄₄ bend DWV) types conforming to ASTM
D3311. A medium radius (¹⁄₄ bend DWV) elbow measures 3¹⁄₁₆"
(7.8 cm) minimum from the plane of one opening to the centerline
of the other opening for 2" (5.1 cm) diameter pipe, and 4⁹⁄₁₆"
(11.6 cm) minimum for 3" (7.6 cm) pipe.
Proper Vent/Flue and Combustion Air Piping
Practices
Adhere to these instructions to ensure safe and proper furnace
performance. The length, diameter and number of elbows of the
vent/flue pipe and combustion air pipe (when applicable) affects
the performance of the furnace and must be carefully sized. All
piping must be installed in accordance with local codes and
these instructions.
Piping must be adequately secured and supported to prohibit
sagging, joint separation and/or detachment from the furnace.
Horizontal runs of vent/flue piping must be supported every 3 ft
to 5 ft (91.4 cm to 1.5 m) and must maintain a ¹⁄₄" (6.4 mm) per
foot downward slope, back toward the furnace, to properly return
condensate to the furnace’s drain system. Allowances should be
made for minor expansion and contraction due to temperature
variations. For this reason, particular care must be taken to
secure piping when a long run is followed by a short offset of less
than 40" (101.6 cm).
Precautions should be taken to prevent condensate from freezing
inside the vent/flue pipe and/or at the vent/flue pipe termination.
All vent/flue piping exposed to freezing temperatures below 35°F
(1.7ºC) for extended periods of time must be insulated with ¹⁄₂"
(1.3 cm) thick closed-cell foam. Also all vent/flue piping exposed
outdoors in excess of the terminations shown in this manual (or in
unheated areas) must be insulated with ¹⁄₂" (1.3 cm) thick
closed-cell foam. Inspect piping for leaks prior to installing
insulation.
Termination Locations
NOTE: Refer to “Location Requirements and Considerations” for
combustion air contaminant restrictions.
The following bullets and illustration describe the restrictions
concerning the appropriate location of vent/flue pipe and
combustion air intake pipe (when applicable) terminations. Refer
to “Nondirect Vent (Single Pipe) Piping and Direct Vent (Dual
Pipe) Piping” located in this section for specific details on
termination construction.
■ All terminations (flue and/or intake) must be located at least
12" (30.5 cm) above ground level or the anticipated snow
level.
■ Vent terminations (nondirect and direct vent) must terminate
at least 3 ft (91.4 cm) above any forced air inlet located within
10 ft (3 m).
NOTE: This provision does not apply to the combustion air
intake termination of a direct vent application.
Canadian Venting Requirements
In Canada, venting must conform to the requirements of the
current CAN/CSA-B149.1-05 Installation Code. Use only CSAlisted, ULC-S636 compliant 2" or 3" (5.1 cm or 7.6 cm) diameter
PVC or ABS pipe, solvent cement and fittings throughout. The
certified piping should be clearly marked with the ULC Std
“S636” on the pipe and fittings. Carefully follow the pipe
manufacturers’ instructions for cutting, cleaning and solvent
cementing PVC and/or ABS.
The vent can be run through an existing unused chimney
provided the space between the vent pipe and the chimney is
insulated and closed with a weather-tight, corrosion-resistant
flashing.
Standard Furnace Connections
It is the responsibility of the installer to ensure that the piping
connections to the furnace are secure, airtight and adequately
supported.
As shipped, attachment “couplings” for vent/flue and combustion
air intake pipe connections are provided on the furnace’s top
cover (upflow) or base pan (counterflow). To use the standard
connections, field-supplied vent/flue pipe and combustion air
intake pipe (when applicable) should be secured directly to the
furnace at these locations.
Vent/Flue Pipe
Vent/flue pipe can be secured to the vent/flue coupling using the
rubber coupling and worm gear hose clamps provided with this
furnace. See “Standard Connections” illustration. The rubber
coupling allows separation of the vent/flue pipe from the furnace
during servicing. Combustion air and vent piping should be
routed in a manner to avoid contact with refrigerant lines,
metering devices, condensate drain lines, etc. If necessary,
clearances may be increased by utilizing two 45º long-sweep
elbows and creating an “S” joint to provide additional space at
connection locations. This joint can be rotated on the fitting to
establish maximum clearance between refrigerant lines, metering
devices, condensate drain lines, etc. This joint is the equivalent of
one 90º elbow when considering elbow count.
11
Vent Termination Clearances
NOTE: Because of probable material conflicts, do not use other
commercially available “no hub connectors.” The combustion air
intake pipe can also be secured directly to the counterflow unit
air intake pipe coupling.
A
B
Combustion Air Pipe—Nondirect Vent Installations
C
J
D
E
I
A minimum of one 90° elbow should be installed on the
combustion air intake coupling to guard against inadvertent
blockage.
D
Standard Connection—Upflow
E
H
D
E
G
E
B
B
F
C
A. Nondirect vent and direct vent
vent/flue terminations
B. Nondirect vent—vent/flue
terminations
C. No terminations above walkway
D. 48" (121.9 cm minimum)
E. 12" (30.5 cm) minimum
F. Direct vent—vent/flue
termination
G. Forced air inlet
H. Grade or highest anticipated
snow level
I. 3" (7.6 cm) minimum
J. Less than 10 ft (3 m)
A
Increased Clearance Configuration
A
A. 90º PVC elbow (nondirect vent only) C. Rubber coupling with worm
gear hose clamps
B. Combustion air pipe (direct vent
only)
D. Vent/flue pipe
B
Standard Connection—Counterflow
B
D
C
A. Vent pipe
B. 45º long-sweep elbows
A
NOTES:
■ Do not use other commercially available “no hub connectors”
due to possible material conflicts.
■ The vent/flue pipe can also be secured using a PVC or ABS
elbow or coupling using the appropriate glue (see “Materials
and Joining Methods”).
■ For nondirect vent installations, a minimum of one 90° elbow
should be installed on the combustion air intake coupling to
guard against inadvertent blockage.
Combustion Air Pipe—Direct Vent Installations
On upflow units, secure the combustion air intake pipe directly to
the air intake coupling. On counterflow units secure the
combustion air intake pipe to the air intake coupling using the
rubber coupling and worm gear hose clamps provided with the
unit. The counterflow rubber coupling allows service removal of
air intake piping internal to the furnace blower compartment.
12
A. 90º PVC elbow (nondirect vent C. Rubber couplings with worm
only)
gear hose clamps
B. Combustion air pipe (direct vent D. Vent/flue pipe
only)
Vent/Flue Pipe Cuts
Alternate Furnace Connections
If the standard locations are undesirable for a specific installation,
alternate side panel locations are available for both combustion
air inlet and vent/flue pipe connections. These locations may be
of particular benefit to upright upflow installations requiring
additional access to an A coil, or to upright counterflow
installations requiring additional access to a filter or electronic air
cleaner, or to horizontal installations desiring vent/flue (and
combustion air intake) piping run vertically from the side of the
cabinet.
NOTE: Standard and alternate locations can be combined (for
example, an installation may use the standard combustion air
intake location but use the alternate vent/flue location or vice
versa), if needed.
WARNING
Edges of sheet metal holes may be sharp. Use gloves as
a precaution when removing hole plugs.
A
B
A. Flange
B. Cut location
C
C. 3³⁄₄" (9.5 cm)
Upflow Units
6. Remove the plastic plug from the alternate vent/flue location.
7. Relocate and install the plastic plug in the standard vent/flue
location (top cover).
Counterflow Units
Remove the plastic plug from the alternate vent/flue location.
Alternate Vent/Flue Location
The alternate vent/flue location is the large hole directly in line
with the induced draft blower outlet. To use the alternate vent/flue
location, refer to the following steps and the “Alternate Vent/Flue
Location” illustration.
NOTE: Counterflow instructions follow the upflow instructions.
Upflow Units
1. Remove and save the 4 screws securing the vent/flue
coupling to the furnace top panel.
Counterflow Units
Remove and save the 4 screws securing the vent/flue
coupling to the furnace base pan. Also remove the 3 screws
securing the furnace’s internal vent/flue piping to the blower
deck.
Upflow and Counterflow Units
2. Loosen the worm gear hose clamps on the rubber elbow and
detach the rubber elbow from both the induced draft blower
and the vent/flue pipe.
3. Remove the vent/flue pipe from the furnace.
Upflow Units
4. Cut the vent/flue pipe 3³⁄₄" (9.5 cm) from the flanged end of
the pipe. See “Vent/Flue Pipe Cuts” illustration.
NOTE: The section of pipe attached to the coupling will reach
through the side panel to the induced draft blower.
5. Discard remaining pipe and elbows.
Counterflow Units
Cut the vent/flue pipe 3³⁄₄" (9.5 cm) from the blower deck
coupling. See “Vent/Flue Pipe Cuts” illustration
Save vent/flue pipe attached to the blower deck coupling for
use in the alternate location.
Relocate and install the plastic plug in the standard vent/flue
location (base pan).
Plug remaining hole in the blower deck with the plastic plug
included in the drain kit bag.
Upflow and Counterflow Units
8. Insert the cut section of the vent/flue pipe and coupling into
the alternate vent/flue location.
9. Attach the vent/flue pipe and coupling to the induced draft
blower using a rubber coupling and worm gear hose clamps
provided in the drain kit bag.
10. Secure the coupling to the cabinet using the screws removed
in Step 1 or with field-supplied ³⁄₈" #8 self-drilling screws.
WARNING
The rubber elbow is not designed to support a load.
When the
rubber elbow is mounted externally to the
Placeholder
furnace cabinet, extreme care must be taken to adequately
support field-supplied vent/flue piping, as damage can
result in leaks causing bodily injury or death due to
exposure to flue gases, including carbon monoxide.
11. For upright installations, externally mount the rubber elbow to
the vent/flue coupling using a worm gear hose clamp.
12. Secure the field-supplied vent/flue piping to the rubber elbow
using a worm gear hose clamp.
NOTE: Use of the alternate vent/flue location for upright
installations, requires the drain trap to be installed on the
same side of the furnace as the flue pipe.
13. For horizontal installations, externally secure the field
supplied vent/flue pipe directly to the vent/flue coupling using
a PVC or ABS coupling or elbow.
Discard remaining pipe and elbows.
13
Alternate Vent/Flue Location—Upflow
Alternate Combustion Air Intake Location
A
B
C
D
E
A. Vent/flue pipe
B. Screw locations (4)
C. Plastic plug—alternate vent/flue location
D. Rubber elbow
E. Induced draft
blower
Alternate Vent/Flue Location—Counterflow/Upright
(Upflow Similar)
A
B
C
The alternate combustion air intake location consists of a large,
unobstructed hole (alternate vent connection is aligned with the
induced draft blower). To use the alternate combustion air intake
location, refer to the following steps and the “Alternate
Combustion Air Intake Location” illustration.
1. Remove and save the 4 screws securing the combustion air
intake coupling to the base pan.
2. Remove the 3 screws securing the furnace’s internal
combustion air intake pipe to the induced draft blower deck.
3. Remove the combustion air intake pipe from the furnace and
cut the pipe at the base pan coupling.
4. Save the base pan coupling and gasket from the induced
draft blower deck coupling for use in the alternate location.
Discard the remaining pipe.
5. Remove the plastic plug from the alternate combustion air
intake location.
6. Relocate and install the plastic plug in the standard air intake
location (base pan).
7. Insert the plastic plug (included in the drain kit bag) into the
remaining hole in the induced draft blower deck.
8. With the gasket facing the cabinet side panel and the flange’s
flat spot facing forward, secure the combustion air intake
coupling to the cabinet using the screws removed in Step 1
or with field-supplied ³⁄₈" #8 self-drilling screws.
D
CAUTION
A. Plastic plug from drain kit bag
B. Vent/flue pipe
C. Rubber elbow
D. Induced draft blower
Alternate Vent/Flue Location—Counterflow
A
B
C
D
E
F
Be sure not to damage internal wiring or other
components when reinstalling coupling and screws.
9. For nondirect vent installations installed horizontally, a
minimum of one 90° elbow should be installed on the
combustion air intake coupling to guard against inadvertent
blockage.
NOTE: No elbow is required on the alternate combustion air
intake of upright installations, however, a minimum clearance
of 2" (5.1 cm) is required to assure proper air supply.
10. For direct vent installations, secure field-supplied combustion
air intake pipe directly to the air intake coupling.
NOTE: A PVC coupling or elbow is required on counterflow
furnaces.
Alternate Combustion Air Intake Location—Counterflow
B
A
A. Vent/flue pipe
B. Screw locations (4)
C. Screw locations (3)
D. Plastic plug—alternate vent/flue location
E. Rubber elbow
F. Induced draft blower
C
F
E
Alternate Vent/Flue Location—Upflow /Horizontal
(Counterflow Similar)
A
B
D
C
A. Section of pipe to be D. Plastic plug—alternate combustion air
cut.
intake location
B. Screw locations (4)
E. Screw locations (3)
C. 2" (5.1 cm) minimum F. Plastic plug from drain kit bag
A. Rubber coupling
B. Vent/flue pipe
14
C. Induced draft blower
Nondirect Vent (Single Pipe) Piping
Nondirect vent installations require only a vent/flue pipe. The vent
pipe can be run horizontally with an exit through the side of the
building or run vertically with an exit through the roof of the
building. The vent can also be run through an existing unused
chimney; however, it must extend a minimum of 12" (30.5 cm)
above the top of the chimney. The space between the vent pipe
and the chimney must be closed with a weather-tight, corrosionresistant flashing. For details concerning connection of the vent/
flue pipe to the furnace, refer to “Vent Pipe Installation and
Combustion Air—Standard Furnace Connections” or “Vent Pipe
Installation and Combustion Air—Alternate Furnace
Connections” for specific details.
Refer to the following “Nondirect Vent (Single Pipe) Piping—Vent/
Flue Pipe Terminations” for specific details on termination
construction.
Although nondirect vent installations do not require a combustion
air intake pipe, a minimum of one 90° elbow should be attached
to the furnace’s combustion air intake if an upright installation
uses the standard intake location, or a horizontal installation uses
the alternate air intake location. This elbow will guard against
inadvertent blockage of the air intake.
Nondirect Vent Applications
Refer to the following tables for applicable length, elbows and pipe diameter for construction of the vent/flue pipe systems of a
nondirect vent (single pipe) installation. In addition to the vent/flue pipe, a single 90º elbow should be secured to the combustion air
intake to prevent inadvertent blockage. The tee used in the vent/flue termination must be included when determining the number of
elbows in the piping system.
Upflow
Nondirect Vent (Single Pipe) Maximum Allowable Length of Vent/Flue Pipe—ft (m)
Number of Elbows
Unit Input (Btu)
Pipe—in. (cm)
1
2
3
4
5
6
7
8
45,000
2 or 2¹⁄₂ (5.12 or 6.4)
71 (21.6)
68 (20.7)
65 (19.8) 62 (18.9) 59 (18)
70,000
2 or 2¹⁄₂ (5.12 or 6.4)
49 (14.9)
46 (14)
43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5)
3 (7.6)
71 (21.6)
68 (20.7)
65 (19.8) 62 (18.9) 59 (18)
56 (17.1) 53 (16.2) 50 (15.2)
90,000
3 (7.6)
71 (21.6)
68 (20.7)
65 (19.8) 62 (18.9) 59 (18)
56 (17.1) 53 (16.2) 50 (15.2)
115,000
3 (7.6)
49 (14.9)
46 (14)
43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5)
56 (17.1) 53 (16.2) 50 (15.2)
28 (8.5)
28 (8.5)
Counterflow
Direct Vent (Dual Pipe) Maximum Allowable Length of Vent/Flue Pipe—ft (m)
Number of Elbows
Unit Input (Btu)
Pipe—in. (cm)
1
2
3
4
5
70,000
2 or 2¹⁄₂ (5.12 or 6.4)
61 (18.6)
58 (17.7)
55 (16.8)
52 (15.8)
49 (14.9) 46 (14)
3 (7.6)
71 (21.6)
68 (20.7)
65 (19.8)
62 (18.9)
59 (18)
2 or 2¹⁄₂ (5.12 or 6.4)
61 (18.6)
58 (17.7)
55 (16.8)
52 (15.8)
49 (14.9) 46 (14)
3 (7.6)
71 (21.6)
68 (20.7)
65 (19.8)
62 (18.9)
59 (18)
56 (17.1) 53 (16.2) 50 (15.2)
3 (7.6)
71 (21.6)
68 (20.7)
65 (19.8)
62 (18.9)
59 (18)
56 (17.1) 53 (16.2) 50 (15.2)
90,000
115,000
NOTES:
■ One 90º elbow should be secured to the combustion air
intake connection.
■ Minimum requirement for each vent/flue pipe is 5 ft (1.5 m)
and 1 elbow/tee.
■ Tee used in the vent/flue termination must be included when
determining the number of elbows in the piping system.
■
■
6
7
8
43 (13.1) 40 (12.2)
56 (17.1) 53 (16.2) 50 (15.2)
43 (13.1) 40 (12.2)
2¹⁄₂" or 3" (6.4 cm or 7.6 cm) diameter pipe can be used in
place of 2" (5.1 cm) diameter pipe.
Increased clearance configurations using two 45º long-sweep
elbows should be considered equivalent to one 90º elbow.
15
Vent/Flue Pipe Terminations
■
■
■
■
■
■
■
■
■
■
■
The vent/flue pipe may terminate vertically, as through a roof,
or horizontally, as through an outside wall.
Vertical vent/flue pipe terminations should be as shown in
“Vertical Vent Termination (Single Pipe)” illustration. Refer to
“Termination Locations” in this section for details concerning
location restrictions.
The penetration of the vent through the roof must be sealed
tight with proper flashing such as is used with a plastic
plumbing vent.
Horizontal vent/flue pipe terminations should be as shown in
“Horizontal Vent Termination (Single Pipe)” illustration. Refer
to “Termination Locations” in this section for details
concerning location restrictions.
A 2³⁄₈" (6.1 cm) diameter wall penetration is required for 2"
(5.1 cm) diameter pipe.
A 3" (7.6 cm) diameter hole is required for a 2¹⁄₂" (6.4 cm)
pipe.
A 3¹⁄₂" (8.9 cm) diameter hole is required for 3" (7.6 cm)
diameter pipe.
To secure the pipe passing through the wall and prohibit
damage to the piping connections, a coupling should be
installed on either side of the wall and solvent cemented to a
length of pipe connecting the 2 couplings.
The length of pipe should be the wall thickness plus the
depth of the socket fittings to be installed on the inside and
outside of the wall.
The wall penetration should be sealed with silicone caulking
material.
In a basement installation, the vent/flue pipe can be run
between joist spaces.
NOTE: If the vent pipe must go below a joist and then up into
the last joist space to penetrate the header, two 45° elbows
should be used to reach the header rather than two 90°
elbows.
Alternate Vertical Vent Termination (Single Pipe)
A
B
A. 90º medium radius elbows
B. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
Standard Horizontal Vent Termination (Single Pipe)
B
C
A
D
G
F
H
E
A. Inside building
B. Wall
C. Outside building
D. Tee or 90º elbow turned
down
E. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
F. 12" (30.5 cm) minimum from wall
G. Coupling
H. Elbow or coupling
Standard Horizontal Vent Termination (Single Pipe)—
Above Highest Anticipated Snow Level
Vertical Vent Termination (Single Pipe)
A
A
B
B
B
C
A. Tee (optional)
B. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
16
A. 12" (30.5 cm) minimum from wall
B. Tee or 90º elbow turned down
C. 12" (30.5 cm) minimum to roof or highest anticipated snow level
Direct Vent (Dual Pipe) Piping
Vent/Flue and Combustion Air Pipe
Lengths and Diameters
The inlet air screens provided in the installation instruction packet
are available for the installer to use in the inlet of the combustion
air pipe to prevent animals from building nests in the combustion
air pipe. Installation of screens, while strongly recommended, is
not required and will not affect performance of the furnace.
Direct vent installations require both a combustion air intake and
a vent/flue pipe. The pipes may be run horizontally and exit
through the side of the building or run vertically and exit through
the roof of the building. The pipes may be run through an existing
unused chimney; however, they must extend a minimum of 12"
(30.5 cm) above the top of the chimney. The space between the
pipes and the chimney must be closed with a weathertight,
corrosion resistant flashing. Both the combustion air intake and
vent/flue pipe terminations must be in the same atmospheric
pressure zone. See “Termination Locations,” or “Concentric Vent
Termination” in this section for specific details on termination
constructions. For details concerning connection of pipes to the
furnace, refer to the “Standard Furnace Connections” or
“Alternate Furnace Connections” in this section.
Refer to the following table for applicable length, elbows and pipe
diameter for construction of the vent/flue and combustion air
intake pipe systems of a direct vent (dual pipe) installation. The
number of elbows tabulated represents the number of elbows
and/or tees in each vent/flue and combustion air intake pipe.
Elbows and/or tees used in the terminations must be included
when determining the number of elbows in the piping systems.
If the combustion air intake pipe is to be installed above a
finished ceiling or other area where dripping of condensate will
be objectionable, insulation of the combustion air pipe may be
required. Use ¹⁄₂" (1.3 cm) thick closed-cell foam insulation where
required.
Vent/Flue and Combustion Air Pipe Terminations
The vent/flue and combustion air pipes may terminate vertically, as through a roof, or horizontally, as through an outside wall.
Upflow
Direct Vent (Dual Pipe) Maximum Allowable Length of Vent/Flue and Combustion Air Intake Pipe—ft (m)
Number of Elbows
Unit Input
(Btu)
Termination
Style
Pipe—
in. (cm)
45,000
Standard
70,000
1
2
3
2 or 2¹⁄₂
(5.12 or 6.4)
71 (21.6)
68 (20.7)
65 (19.8) 62 (18.9) 59 (18)
56 (17.1) 53 (16.2) 50 (15.2)
Alternate
2 or 2¹⁄₂
(5.12 or 6.4)
58 (17.7)
55 (16.8)
52 (15.8) 49 (14.9) 46 (14)
43 (13.1) 40 (12.2) 37 (11.3)
Standard
2 or 2¹⁄₂ (5.12
or 6.4)
49 (14.9)
46 (14)
43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5) 28 (8.5)
3 (7.6)
71 (21.6)
68 (20.7)
65 (19.8) 62 (18.9) 59 (18)
2 or 2¹⁄₂ (5.12
or 6.4)
36 (11)
33 (10.1)
30 (9.2)
3 (7.6)
57 (17.4)
54 (16.5)
51 (15.5) 48 (14.6) 45 (13.7) 42 (12.8) 39 (11.9) 36 (11)
Standard
3 (7.6)
71 (21.6)
68 (20.7)
65 (19.8) 62 (18.9) 59 (18)
Alternate
3 (7.6)
57 (17.4)
54 (16.5)
51 (15.5) 48 (14.6) 45 (13.7) 42 (12.8) 39 (11.9) 36 (11)
Standard
3 (7.6)
49 (14.9)
46 (14)
43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5) 28 (8.5)
Alternate
3 (7.6)
35 (10.7)
32 (9.8)
29 (8.8)
Alternate
90,000
115,000
4
27 (8.2)
26 (7.9)
5
6
8
56 (17.1) 53 (16.2) 50 (15.2)
24 (7.3) 21(6.4)
23 (7)
7
18 (5.5) 15 (4.6)
56 (17.1) 53 (16.2) 50 (15.2)
20 (6.1) 17 (5.2) 14 (4.3)
17
Counterflow
Direct Vent (Dual Pipe) Maximum Allowable Length of Vent/Flue and Combustion Air Intake Pipe—ft (m)
Number of Elbows
Unit Input
(Btu)
Termination
Style
Pipe—
in. (cm)
70,000
Standard
Alternate
90,000
Standard
Alternate
1
2
3
2 or 2¹⁄₂
(5.12 or 6.4)
49 (14.9)
46 (14)
43 (13.1) 40 (12.2) 37 (11.3) 34 (10.4) 31 (9.5) 28 (8.5)
3 (7.6)
71 (21.6)
68 (20.7)
65 (19.8) 62 (18.9) 59 (18)
2 or 2¹⁄₂
(5.12 or 6.4)
36 (11)
33 (10.1)
30 (9.2)
3 (7.6)
57 (17.4)
54 (16.5)
51 (15.5) 48 (14.6) 45 (13.7) 42 (12.8) 39 (11.9) 36 (11)
2 or 2¹⁄₂
(5.12 or 6.4)
61 (18.6)
58 (17.7)
55 (16.8) 52 (15.8) 49 (14.9) 46 (14)
3 (7.6)
71 (21.6)
68 (20.7)
65 (19.8) 62 (18.9) 59 (18)
56 (17.1) 53 (16.2) 50 (15.2)
2 or 2¹⁄₂
(5.12 or 6.4)
48 (14.6)
45 (13.7)
42 (12.8) 39 (11.9) 36 (11)
33 (10.1) 30 (9.2) 27 (8.2)
3 (7.6)
57 (17.4)
54 (16.5)
51 (15.5) 48 (14.6) 45 (13.7) 42 (12.8) 39 (11.9) 36 (11)
NOTES:
■ Maximum allowable limits listed are individual lengths for inlet
and flue and not a combination.
■ Elbows and/or tees used in the terminations must be
included when determining the number of elbows in the
piping system.
■ Number of elbows tabulated are for each vent/flue and
combustion air intake pipe.
■ Minimum length of each vent/flue and combustion air intake
pipe is 5 ft (1.5 m) and one elbow/tee.
■ 2¹⁄₂" (6.4 cm) or 3" (7.6 cm) diameter pipe can be used in
place of 2" (5.1 cm) diameter pipe.
■ Increased clearance configurations using two 45º long-sweep
elbows should be considered equivalent to one 90º elbow.
Vertical pipe terminations should be as shown in “Vertical
Terminations (Dual Pipe)” illustration. Refer to “Termination
Locations” in this section for details concerning location
restrictions. The penetrations through the roof must be sealed
tight with the proper flashing such as is used with a plastic
plumbing vent.
4
27 (8.2)
5
6
7
8
56 (17.1) 53 (16.2) 50 (15.2)
24 (7.3) 21(6.4)
18 (5.5) 15 (4.6)
43 (13.1) 40 (12.2)
Vertical Vent Terminations (Dual Pipe)
D
E
B
A
H
C
G
F
E
B
A
H
C
G
F
A. 12" (30.5 cm) minimum
B. Combustion air intake pipe
C. 90º medium radius elbows
D. Tee
E. Vent/flue pipe
18
F. 24" (61 cm) maximum, 3" (7.6 cm)
minimum
G. Screen
H. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
Horizontal terminations should be as shown in “Standard
Horizontal Vent Terminations (Dual Pipe)” illustration. Refer to
“Termination Locations” in this section for location restrictions.
■ A 2³⁄₈" (6.1 cm) diameter wall penetration is required for 2"
(5.1 cm) diameter pipe.
■ A 3" (7.6 cm) diameter hole is required for a 2¹⁄₂" (6.4 cm)
pipe.
■ A 3¹⁄₂" (8.9 cm) diameter hole is required for 3" (7.6 cm)
diameter pipe.
■ To secure the pipe passing through the wall and prohibit
damage to the piping connections, a coupling should be
installed on either side of the wall and solvent cemented to a
length of pipe connecting the 2 couplings.
■ The length of pipe should be the wall thickness plus the
depth of the socket fittings to be installed on the inside and
outside of the wall.
■ The wall penetration should be sealed with silicone caulking
material.
Standard Horizontal Vent Terminations (Dual Pipe)
B
Standard Horizontal Terminations (Dual Pipe)—Above
Highest Anticipated Snow Level
C
B
D
A
H
F
E
E
G
A
A. Support straps
B. 24" (61 cm) maximum, 3"
(7.6 cm) minimum
C. 12" (30.5 cm) minimum from wall
D. Tee or 90º elbow turned down
E. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
F. Screen
G. 90º medium radius elbow
H. Combustion air intake
Alternate Horizontal Terminations (Dual Pipe)—Above
Highest Anticipated Snow Level
A
C
A
E
D
G
A
G
D
F
B
F
A. 24" (61 cm) maximum, 3"
D. 12" (30.5 cm) minimum to roof or
(7.6 cm) minimum
highest anticipated snow level
B. 12" (30.5 cm) minimum from E. Combustion air intake
wall
F. Screen
C. Tee or 90º elbow turned
G. 90º medium radius elbow
down
D
C
E
Alternate Horizontal Vent Terminations (Dual Pipe)
A. 90º medium radius elbow
B. Flue/vent pipe
C. 24" (61 cm) maximum, 3"
(7.6 cm)
B
A
C
H
G
F
E
A. 90º medium radius elbow
B. Flue/vent pipe
C. 12" (30.5 cm) minimum
from wall
D. Screen
D
E. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
F. Combustion air intake
G. 24" (61 cm) maximum, 3" (7.6 cm)
minimum
H. 24" (61 cm) maximum radius
■
D. Combustion air intake
E. 12" (30.5 cm) minimum to roof or
highest anticipated snow level
F. 24" (61 cm) maximum radius
G. Screen
In a basement installation, the vent/flue pipe can be run
between joist spaces.
NOTE: If the vent pipe must go below a joist and then up into
the last joist space to penetrate the header, two 45° elbows
should be used to reach the header rather than two 90°
elbows.
Vent/Intake Terminations for Installation of
Multiple Direct Vent Furnaces
If more than one direct vent furnace is to be installed vertically
through a common roof top, maintain the same minimum
clearances between the exhaust vent and air intake terminations
of adjacent furnaces as with the exhaust vent and air intake
terminations of a single furnace.
If more than one direct vent furnace is to be installed horizontally
through a common side wall, maintain the clearances as shown
in “Horizontal Venting of Multiple Furnaces” illustration. Always
terminate all exhaust vent outlets at the same elevation and
always terminate all air intakes at the same elevation.
19
Horizontal Venting of Multiple Furnaces
Concentric Vent Termination
A
B
Refer to the directions provided with the Concentric Vent Kit
(DCVK) for installation specifications.
B
F
C
GF
D
H
E
A. 90º medium radius
elbows
B. Flue/vent pipes
C. 12" (30.5 cm) minimum
to roof or highest
anticipated snow level
D. 12" (30.5 cm) minimum to roof or highest
anticipated snow level
E. Screens
F. 24" (61 cm) maximum, 3" (7.6 cm) minimum
G. 3" (7.6 cm) minimum
H. Combustion air intakes
Side Wall Vent Kit
This kit is to be used with 2" or 3" (5.1 cm or 7.6 cm) direct vent
systems. The vent kit must terminate outside the structure and
may be installed with the intake and exhaust pipes located sideby-side or with one pipe above the other.
NOTE: This kit is not intended for use with single pipe (nondirect
vent) installations.
Refer to the directions furnished with the Side Wall Vent Kit (Part
Number 0170K00000S) for installation specifications
CONDENSATE DRAIN LINES AND DRAIN TRAP
A condensing gas furnace achieves its high level of efficiency by
extracting almost all of the heat from the products of combustion
and cooling them to the point where condensation takes place.
The condensate which is generated must be piped to an
appropriate drain location.
In upright installations, the furnace’s drain hoses may exit either
the right or left side of the furnace.
NOTE: If the alternate vent/flue outlet is utilized in an upright
installation, the drain trap and drain connections must be located
on the same side as the alternate vent/flue outlet.
In horizontal installations, the drain hoses will exit through the
bottom (down side) of the furnace with the drain trap suspended
beneath the furnace. The field-supplied drain system must be in
accordance with all local codes and the instructions in the
following sections.
Follow the bullets listed below when installing the drain system.
Refer to the following sections for specific details concerning
furnace drain trap installation and drain hose hookups
NOTES:
■ The drain trap supplied with the furnace must be used.
■ The drain line between the furnace and drain location must
be constructed of ³⁄₄" (1.9 cm) PVC or CPVC.
■ The drain line between the furnace and drain location must
maintain a ¹⁄₄" (6.4 mm) per foot downward slope toward the
drain.
■ Do not trap the drain line in any other location than at the
drain trap supplied with the furnace.
■ Do not route the drain line outside where it may freeze.
■ If the drain line is routed through an area which may see
temperatures near or below freezing, precautions must be
taken to prevent the condensate from freezing within the
drain line.
■ If an air conditioning coil is installed with the furnace, a
common drain may be used. An open tee must be installed in
the drain line near the cooling coil to relieve positive air
pressure from the coil’s plenum. This is necessary to prohibit
any interference with the function of the furnace’s drain trap.
20
Standard Right or Left Side
Drain Hose Connections
All installation positions require the use of the drain trap, hoses,
tubes and clamps. The following quantity of hoses, tubes, and
hose clamps are provided with the unit.
Hose and Tube Identification
A
B
C
D
H
A. Drain trap
B. Hose A
C. Hose B
D. Tube 2 (2)
G
F
E
E. Tube 1
F. Red hose clamp (1)
G. Silver hose clamp (1)
H. Green hose clamps (3)
Upright Installations—Trap on Right Side
In an upright installation, drain hoses are connected to drain
ports on the rubber elbow and the recuperator coil front cover.
The drain lines are then routed through the right side panel and
into the drain trap secured to the outside of the cabinet.
NOTE: Refer to “Alternate Vent/Flue Hose Connections” for
upright installations using an alternate vent/flue outlet,
1. Remove the rubber plug from the right side of the front cover
drain port.
2. Secure Hose A to the front cover drain port with a red hose
clamp.
3. Route Hose A to the rear side panel grommet hole.
4. Cut and remove ¹⁄₄" (6.4 cm) from the end of the drain port on
the rubber elbow.
5. Insert Tube 1 into the rubber elbow drain port and secure with
the silver hose clamp. Angle Tube 1 outward toward the front
of the furnace.
6. Cut 17³⁄₄" (45.1 cm) from the long end of Hose B and discard.
7. Secure the remaining Hose B to Tube 1 with a green hose
clamp.
8. Route the other end of Hose B to the front right side panel
grommet hole.
NOTE: For details concerning the mounting of the drain trap,
refer to “Horizontal Drain Trap Mounting.”
9. Insert the short end of each Tube 2 through the side panel
grommet holes.
10. Secure the tubes to Hose A and Hose B with the green hose
clamps.
NOTE: Ensure hoses and tubes maintain a downward slope
for proper drainage and that they are not kinked or binding.
12. Insert the short end of one Tube 2 through the rear right side
panel grommet drain hole.
13. Secure Tube 2 to Hose A with a green hose clamp.
14. Insert the short end of the remaining Tube 2 into Hose B from
the rubber elbow and secure with a green hose clamp.
15. Ensure that the hoses and tubes maintain a downward slope
for proper drainage and are not kinked or binding.
Alternate Upright Upflow Connections—Right Side Only
(Counterflow Similar)
B
A
C
D
Upright Standard Connections—Right Side Upflow
(Counterflow Similar)
E
A
F
B
C
D
E
F G
H
L
A. Right side panel
B. Rubber elbow
C. Rubber elbow drain
port
D. Red hose clamps
D K
J
E. Tube 1
F. Hose B
G. Side panel
grommet holes
H. Tubes 2
I
I. Drain trap
J. Green hose clamps (3)
K. Hose A
L. Front cover drain port
Alternate Vent/Flue Drain Hose Connections
Upright installations using the alternate vent/flue outlet will
require right side only drain hoses to be connected as follows.
Refer to Vent/Flue Pipe and Combustion Air Pipe” for details on
alternate vent/flue pipe connection.
1. Remove the rubber plug from the right-side drain port on the
front cover. Save the rubber plug for later use.
2. Secure Hose A to the drain port on the front cover with a red
hose clamp.
3. Route Hose A to the rear right side panel grommet hole.
4. Remove the grommet from the front right side panel drain
hole.
5. Seal the hole in the grommet with the large end of the rubber
plug removed in Step 1.
6. Reinstall the grommet and rubber plug into the side panel
drain hole.
7. Cut ¹⁄₄" (6.4 cm) from the end of the drain port on the
externally mounted rubber elbow. Discard cut portion.
8. Insert Tube 1 into the rubber elbow drain port and secure with
a silver hose clamp.
NOTE: Angle tube toward drain trap.
9. Cut 17⁷⁄₈" (45.4 cm) from the long end of Hose B. Discard cut
portion.
10. Secure the remaining end of Hose B to the exposed end of
Tube 1 with a green hose clamp.
11. Route Hose B toward the right side panel grommet holes.
G
F
H
L
K
J
A. Front cover drain port
B. Rubber elbow (externally mounted)
C. Rubber elbow drain port
D. Silver hose clamp
E. Tube 1
F. Green hose clamps (3)
I
G. Hose B
H. Side panel grommet holes
I. Drain trap
J. Tubes 2
K. Hose A
L. Red hose clamp
Upright Installations—Trap on Left Side
NOTE: For left side trap installation, grommets must be moved to
the left side of the furnace and the plugs installed on the right
side of the furnace.
1. Remove the rubber plug from the left side of the front cover
drain port.
2. Secure Hose A to the front cover drain port with a red hose
clamp.
3. Route Hose A to the rear side panel grommet hole.
4. Cut and remove ¹⁄₄" (6.4 cm) from the end of the drain port on
the rubber elbow.
5. Insert Tube 1 into the rubber elbow drain port and secure with
the silver hose clamp. Angle Tube 1 outward toward the front
of the furnace.
6. Cut X" from the long end of Hose B and discard. Refer to the
following table for the appropriate length to cut.
7. Secure the remaining Hose B to Tube 1 with a green hose
clamp.
8. Route the other end of Hose B to the front left side panel
grommet hole.
NOTE: Long Hose B must always be connected to Tube 1 and
the elbow and not on the front cover.
9. Insert the short end of each Tube 2 through the side panel
grommet holes.
10. Secure the tubes to Hose A and Hose B with the green hose
clamps.
NOTE: Ensure hoses and tubes maintain a downward slope
for proper drainage and that they are not kinked or binding.
21
Upright Standard Connections—Left Side Upflow
(Counterflow Similar)
A
M
B
C
D
E
F
L
K
J
I
H
A. Left side panel
B. Rubber elbow
C. Rubber elbow
drain port
D. Silver hose clamp
F G
E. Tube 1
I. Tubes 2
F. Green hose clamps (3) J. Side panel drain holes
K. Hose A
G. Hose B
H. Drain trap
L. Front cover drain port
Cabinet Width
Models
(kBtu/Tons)
X Length to Cut from
Long End of Hose B
17¹⁄₂" (44.5 cm)
45_30
7" (17.8 cm)
21" (53.4 cm)
70_40
3¹⁄₂" (8.89 cm)
24¹⁄₂" (62.3 cm)
090_50
None
115_50
Upright Drain Trap Mounting—Left or Right Side
Panel
1. Insert the drain tubes into the drain trap and position the
drain trap against the side panel.
NOTE: Drain tubes must reach the bottom of the drain trap.
2. Secure the drain trap to the side panel at the mounting holes
(dimples or crosshairs on counterflow models) located below
the grommet drain holes.
3. Attach the PVC drain line to the drain trap outlet with either a
90° elbow or coupling.
2. Secure Hose A to the front cover drain tap with a red hose
clamp.
3. Route Hose A to the rear right (down) side panel grommet
holes.
4. Cut ¹⁄₄" (6.4 cm) from the end of the drain port on the
externally mounted rubber elbow. Discard cut portion.
5. Insert Tube 1 into the rubber elbow drain port and secure with
a silver hose clamp.
NOTE: Angle tube outward toward front of furnace.
6. Cut 17³⁄₄" (45.1 cm) from the long end of Hose B. Discard cut
portion.
7. Secure the remaining end of Hose B to exposed end of Tube
1 with a green hose clamp.
8. Route Hose B to the front right (down) side panel grommet
holes.
9. Cut 5¹⁄₂" (14 cm) straight length from the long end of each
Tube 2. Discard the radius pieces.
10. Insert approximately 1" (2.5 cm) of each Tube 2 through the
right (down) side panel grommet holes.
11. Secure the tubes to Hose A and Hose B using the green hose
clamps.
NOTE: Ensure that the hoses and tubes maintain a
downward slope for proper drainage and are not kinked or
bound.
For details concerning the mounting of the drain trap, refer to
“Horizontal Drain Trap Mounting” in “Condensate Drain Lines and
Drain Trap.”
Horizontal Upflow Connections—Right Side Down
(Counterflow Similar)
B
A
M
L
K
H
J
Horizontal Installations—Right Side Down
Horizontal installations with the right side down require that the
drain hoses be connected to the right side front cover drain port
and the rubber elbow drain port.
NOTE: On counterflow models, relocation of the front cover
pressure switch hose is required.
Make connections as follows:
1. Remove the rubber plug from the right side of the front cover
drain port.
NOTE: On counterflow furnaces, relocate the front cover
pressure switch hose connection from the left side pressure
tap to the right (down) side tap to guard against blocked drain
conditions. Cut the hose to appropriate length to minimize
sagging. Plug the left (unused) pressure tap with the plug
removed from right side.
22
D
C
HG F E
I
A. Front cover drain port
B. Front cover pressure tap
C. Right side panel
D. Rubber elbow
E. Rubber elbow drain port
F. Silver hose clamp
G. Tube 1
H. Green hose clamps (3)
I. Drain trap
J. Tubes 2
K. Hose B
L. Hose A
M. Red hose clamp
Horizontal Installations—Left Side Down
Horizontal installations with the left side panel down will require
the drain hoses to be connected to the left side front cover drain
port and the side drain port on the rubber elbow.
1. Remove the rubber plug from the front cover left (down) side
drain port.
2. Relocate the front cover pressure switch hose connection
from the right side (as shipped) pressure tap to the left (down)
side tap.
NOTE: The pressure switch hose must be connected to the
down side to guard against blocked drain conditions. Cut the
hose to the appropriate length to minimize sagging. Plug the
right (unused) pressure tap with the rubber plug removed
from the left side.
3. Secure Hose A to the front cover drain port with a red hose
clamp.
4. Route Hose A to the rear left (down) side panel grommet
holes.
NOTE: For left side drainage, grommets must be relocated to
the left side panel.
5. Remove the rubber cap from the side drain port on the rubber
elbow.
6. Secure the short end of Hose B to the rubber elbow side
drain port using a green hose clamp.
NOTES:
For left side drainage, route Hose B to the far left (down)
side panel grommet holes.
■ Horizontal left side connections (when using a new side
port drain elbow) does not require connecting a hose to
the induced draft blower housing.
7. Cut 5¹⁄₂" (14 cm) straight length from the long end of each
Tube 2. Discard radius ends.
8. Insert approximately 1" (2.5 cm) of each Tube 2 through the
left side panel grommet hole.
9. Secure the tubes to Hose A and Hose B with the green hose
clamps.
NOTE: Tube must reach bottom of trap.
For details concerning the mounting of the drain trap, refer to
“Horizontal Drain Trap Mounting” in this section.
Horizontal Upflow Connections—Left Side Down
(Counterflow Similar)
A
B
C
C
D
E
J
I
H
G C
A. Induced draft blower drain port
B. Hose B
C. Green hose clamps (3)
D. Side panel grommet holes
E. Tubes 2
DE
F
F. Drain trap
G. Hose A
H. Red hose clamps
I. Front cover drain port
J. Left side panel
■
NOTE: Ensure that the hoses and tubes maintain a downward
slope for proper drainage and are not kinked or bound.
Horizontal Drain Trap Mounting—Left or Right
Side Panel
1. Position the drain trap against the side panel with the drain
tubes inserted into the trap.
NOTE: The trap may be orientated with the outlet facing
either the furnace’s top cover or base pan.
2. Secure the drain trap to the side panel at the dimples or
crosshairs located on either side of the grommet drain holes.
3. Confirm that the tubes reach the bottom of the drain trap and
that all of the hoses maintain a downward slope and are not
kinked or binding.
4. Attach the PVC drain line to the drain trap outlet with either a
90° elbow or coupling.
ELECTRICAL CONNECTIONS
WARNING
HIGH VOLTAGE!
To avoid the risk of electrical shock, wiring to
the unit must be polarized and grounded.
CAUTION
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation. Verify proper operation after servicing.
Wiring Harness
WARNING
HIGH VOLTAGE!
To avoid personal injury or death due to
electrical shock, disconnect electrical
power before servicing or changing any
electrical wiring.
The wiring harness is an integral part of this furnace. Field
alteration to comply with electrical codes should not be required.
Wires are color coded for identification purposes. Refer to the
wiring diagram for wire routings. 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 105°C.
Any replacement wiring must be a copper conductor.
23
115-Volt Line Connections
Before proceeding with electrical connections, ensure that the
supply voltage, frequency and phase correspond to that
specified on the unit rating plate. Power supply to the furnace
must be NEC Class 1, and must comply with all applicable
codes. The furnace must be electrically grounded in accordance
with local codes or, in their absence, with the latest edition of The
National Electric Code, ANSI NFPA 70 and/or The Canadian
Electric Code CSA C22.1.
Use a separate fused-branch electrical circuit containing properly
sized wire, and fuse or circuit breaker. The fuse or circuit breaker
must be sized in accordance with the maximum overcurrent
protection specified on the unit rating plate. An electrical
disconnect must be provided at the furnace location.
Connect hot, neutral and ground wires as shown in the wiring
diagram located on the unit’s blower door. For direct vent
applications, the cabinet opening to the junction box must be
sealed air tight using either an UL Listed/CSA approved bushing
such as Heyco Liquid Tight or by applying non-reactive UL
Listed/CSA approved sealant to bushing.
Line polarity must be observed when making field connections.
Line voltage connections can be made through either the right or
left side panel. The furnace is shipped configured for a left side
(right side for counterflows) electrical connection with the
junction box located inside the burner compartment. To make
electrical connections through the opposite side of the furnace,
the junction box must be relocated to the other side of the burner
compartment prior to making electrical connections. To relocate
the junction box, follow the steps shown in “Junction Box
Relocation.”
NOTE: Wire routing must not to interfere with circulator blower
operation, filter removal, or routine maintenance.
1. Remove the burner compartment door.
2. Remove and save the 2 screws securing the junction box to
the side panel.
3. Relocate junction box and associated plugs and grommets to
opposite side panel.
4. Secure with screws removed in Step 2.
WARNING
To avoid the risk of injury, electrical shock or death, the
furnace must be electrically grounded in accordance with
local codes or, in their absence, with the latest edition of the
National Electric Code (NEC).
To ensure proper unit grounding, the ground wire should run from
the furnace ground screw located inside the furnace junction box
all the way back to the electrical panel.
NOTE: Do not use gas piping as an electrical ground.
To confirm proper unit grounding, turn off the electrical power
and perform the following check.
1. Measure the resistance between the neutral (white)
connection and one of the burners.
2. Resistance should measure 10 ohms or less.
This furnace is equipped with a blower door interlock switch
which interrupts the unit voltage when the blower door is opened
for servicing.
NOTE: Do not defeat this switch.
24-Volt Thermostat Wiring
IMPORTANT NOTE
Junction Box Relocation
WARNING
Edges of sheet metal holes may be sharp. Use gloves as
a precaution when removing hole plugs.
WARNING
To prevent personal injury or death due to electric shock,
disconnect electrical power before installing or servicing
this unit.
WARNING
HIGH VOLTAGE!
To avoid the risk of injury, electrical shock
or death, the furnace must be electrically
grounded in accordance with local codes or
in their absence, with the latest edition of the
National Electric Code (NEC).
Line voltage connections can be made through either the right or
left side panel. The furnace is shipped configured for a left side
electrical connection. To make electrical connections through the
opposite side of the furnace, the junction box must be relocated
to the left side prior to making electrical connections. To relocate
the junction box, perform the following steps.
24
Wire routing must not interfere with circulator blower
operation, filter removal or routine maintenance. A removable
plug connector is provided with the control to make
thermostat wire connections. This plug may be removed to
allow wire connections to be made to the plug and then
replaced. It is STRONGLY recommended that multiple wires
into a single terminal be twisted together prior to inserting
into the plug connector. Failure to do so may result in
intermittent operation.
As a 2-stage furnace, the furnace integrated control module
provides terminals for both W1 and W2, and Y1 and Y2
thermostat connections. This allows the furnace to support the
following system applications: 2-stage heating only, 2-stage
heating with single-stage cooling and 2-stage heating with
2-stage cooling. Refer to the following thermostat wiring
diagrams for proper connections to the integrated control
module.
Low voltage connections can be made through either the right or
left side panel. Thermostat wiring entrance holes are located in
the blower compartment. The following illustration shows the
connections for a heat/cool system.
This furnace is equipped with a 40 VA transformer to facilitate use
with most cooling equipment. Consult the wiring diagram located
on the blower compartment door for further details of 115-Volt
and 24-Volt wiring.
Thermostat Wiring Diagram—Single-Stage Thermostat
Application
A
Y
R
R
B
NEU
Y
C
C
D
A. Thermostat—single-stage heating
and single-stage cooling
B. Furnace integrated control module
C. Dehumidistat (optional)
D. Remote condensing unit
(single-stage cooling)
NOTE: To apply a single-stage heating thermostat, the
thermostat selector switch on the integrated control module must
be set on single-stage.
A single-stage thermostat with only one heating stage may be
used to control this furnace. The application of a single-stage
thermostat does not offer true thermostat-driven 2-stage
operation, but provides a timed transition from low to high fire.
The furnace will run on low stage for a fixed period of time before
stepping up to high stage to satisfy the thermostat’s call for heat.
The delay period prior to stepping up can be set at either a fixed
5-minute transition time or a load based variable time between
1 and 12 minutes (Auto transition). If the Auto transition mode is
selected, the control averages the cycle times of the previous
3 cycles and uses the average to determine the time to transition
from low stage to high stage.
To use a single-stage thermostat:
1. Turn off power to the furnace.
2. Move the thermostat selection DIP switch to the Off
(single-stage) position.
3. Set the desired transition time by setting the Stage Delay DIP
switch to On for Auto transition, or Off for 5-minute transition
time.
4. Turn on power. Refer to the following illustration.
ON
OFF
Heat OFF Delay
DIP Switches
Thermostat Wiring Diagram—2-Stage Heating with
Single-Stage Cooling
3
Thermostat
4
A
Stage Delay
S1
24-Volt Dehumidistat Wiring
Y
R
R
B
NEU
Y
C
C
D
A. Thermostat—2-stage heating and
single-stage cooling
B. Furnace integrated control module
C. Dehumidistat (optional)
D. Remote condensing unit
(single-stage cooling)
Thermostat Wiring Diagram—2-Stage Heating with
2-Stage Cooling
A
W2
Y2
W1
Y2
W1
W2
B
NEU
Y2
C
The optional usage of a dehumidistat allows the furnace’s
circulator blower to operate at a slightly lower speed (82% of
desired speed) during a combined thermostat call for cooling and
dehumidistat call for dehumidification. This can be done through
an independent dehumidistat or through a thermostat’s DEHUM
terminal (if available). This lower blower speed enhances
dehumidification of the conditioned air as it passes through the
AC coil. For proper function, a dehumidistat applied to this
furnace must operate on 24 VAC and utilize a switch which opens
on humidity rise.
To install/connect a dehumidistat:
1. Turn off power to furnace.
2. Secure the dehumidistat neutral wire (typically the white lead)
to the terminal marked DEHUM on the furnace integrated
control module.
3. Secure the dehumidistat hot wire (typically the black lead) to
the terminal marked R on the furnace integrated control
module.
4. Secure the dehumidistat ground wire (typically the green lead)
to the ground screw on the furnace junction box.
NOTE: Ground wire may not be present on all dehumidistats.
5. Turn on power to furnace.
To enable the dehumidify function on the integrated control
module, set the dehumidification DEHUM DIP switch from Off to
On.
Once the switch is set, the dehumidify function is enabled during
a combination call for cooling (T-Stat) and dehumidification
(DEHUM-Stat).
ON
D
OFF
9
A. Thermostat—2-stage heating and
2-stage cooling
B. Furnace integrated control module
C. Dehumidistat (optional)
D. Remote condensing unit
(2-stage cooling)
DEHUM
10
Unused
S5
25
■
Fossil Fuel Applications
This furnace can be used in conjunction with a heat pump in a
fossil fuel application. A fossil fuel application refers to a
combined gas furnace and heat pump installation which uses an
outdoor temperature sensor to determine the most cost efficient
means of heating (heat pump or gas furnace).
A heat pump thermostat with 3 stages of heat is required to
properly use a 2-stage furnace in conjunction with a heat pump.
Refer to the fossil fuel kit installation instructions for additional
thermostat requirements.
Strictly follow the wiring guidelines in the fossil fuel kit installation
instructions. All furnace connections must be made to the
furnace 2-stage integrated control module and the FURNACE
terminal strip on the fossil fuel control board.
■
All field wiring must conform to applicable codes.
Connections should be made as shown in the “Optional
Accessories Wiring” illustration.
Optional Accessories Wiring
15-Circuit Connector
Integrated Control Module
115-Volt Line Connection of Accessories (Humidifier
and Electronic Air Cleaner)
WARNING
Humidifier
HIGH VOLTAGE!
To avoid personal injury or death due to
electrical shock, disconnect electrical
power before servicing or changing any
electrical wiring.
The furnace integrated control module is equipped with line
voltage accessory terminals for controlling power to an optional
field-supplied humidifier and/or electronic air cleaner.
The accessory load specifications are as follows:
Humidifier
1.0 Amp maximum at 120 VAC
Electronic Air Cleaner
1.0 Amp maximum at 120 VAC
NOTES:
■ Turn off power to the furnace before installing any
accessories.
■ Follow the humidifier or air cleaner manufacturers’
instructions for locating, mounting, grounding and controlling
these accessories.
■ Accessory wiring connections are to be made through the ¹⁄₄"
quick connect terminals provided on the furnace integrated
control module.
■ The humidifier and electronic air cleaner hot terminals are
identified as HUM and EAC.
■ The humidifier and electronic air cleaner neutral terminals are
identified as NEUTRAL.
Electronic
Air Cleaner
If it is necessary for the installer to supply additional line voltage
wiring to the inside of the furnace, the wiring must conform to all
local codes, and have a minimum temperature rating of 105°C.
All line voltage wire splices must be made inside the furnace
junction box.
The integrated control module humidifier terminals (HUM) are
energized with 115 volts whenever the induced draft blower is
energized. The integrated control module electronic air cleaner
terminals (EAC) are energized with 115 volts whenever the
circulator blower is energized.
24-Volt Humidifier
A 5" (12.7 cm) long brown wire in the wire harness at the low-fire
pressure switch provides 24 VAC humidifier control. This wire is
powered any time the pressure switch is closed. To connect
24 VAC HUM, connect the 24 VAC line of the humidifier to the 5"
(12.7 cm) brown wire. The connection can be made by either
stripping the wire and using a wire connector or by using a
field-supplied quick connect terminal. The wiring must conform
to all local and national codes. Connect the COM side of the
humidifier to the C terminal on the furnace control board (or to
the COM side of the 24 VAC transformer).
NOTE: Do not connect 115-Volt humidifier to these terminals.
GAS SUPPLY AND PIPING
The furnace rating plate includes the approved furnace gas input
rating and gas types. The furnace must be equipped to operate
on the type of gas applied. This includes any conversion kits
required for alternate fuels and/or high altitude.
CAUTION
To prevent unreliable operation or equipment damage,
the inlet gas supply pressure must be as specified on the
unit rating plate with all other household gas-fired
appliances operating.
26
Inlet gas supply pressures must be maintained within the ranges
specified in the Inlet Gas Supply Pressure chart. The supply
pressure must be constant and available with all other household
gas-fired appliances operating. The minimum gas supply pressure
must be maintained to avoid unreliable ignition. The maximum
must not be exceeded to keep the furnace from overfiring.
Inlet Gas Supply Pressure
Natural gas
5.0" W.C. minimum; 10.0" W.C. maximum
Propane gas
11.0" W.C. minimum; 13.0" W.C. maximum
High Altitude Derate
When this furnace is installed at high altitude, the appropriate
high altitude orifice kit must be applied. This is required due to
the natural reduction in the density of both the gas fuel and
combustion air as altitude increases. The kit will provide the
proper design-certified input rate within the specified altitude
range.
High altitude kits are purchased according to the installation
altitude and usage of either Natural or propane gas. Contact your
distributor for a tabular listing of appropriate altitude ranges and
corresponding manufacturer’s high altitude (Natural, propane
gas, and/or pressure switch) kits.
NOTE: Do not derate the furnace by adjusting the manifold
pressure to a lower pressure than specified on the furnace rating
plate. The combination of the lower air density and a lower
manifold pressure will prohibit the burner orifice from drawing the
proper amount of air into the burner. This may cause incomplete
combustion, flashback and possible yellow tipping.
In some areas the gas supplier may artificially derate the gas in
an effort to compensate for the effects of altitude. If the gas is
artificially derated, the appropriate orifice size must be
determined based upon the Btu/ft3 content of the derated gas
and the altitude. Refer to the National Fuel Gas Code, NFPA 54/
ANSI Z223.1, and information provided by the gas supplier to
determine the proper orifice size.
A different pressure switch may be required at high altitude
regardless of the Btu/ft3 content of the fuel used. Contact your
distributor for a tabular listing of appropriate altitude ranges and
corresponding manufacturer’s pressure switch kits.
Propane Gas Conversion
WARNING
Possible property damage, personal injury or death may
occur if the correct conversion kits are not installed. The
appropriate kits must
be applied to ensure safe and proper
Placeholder
furnace operation. All conversions must be performed by
a qualified installer or service agency.
This furnace is configured for Natural gas. The appropriate
manufacturer’s propane gas conversion kit, must be applied for
propane gas installations. See “Propane Gas and/or High Altitude
Installations.”
Contact your distributor for a tabular listing of appropriate
manufacturer’s kits for propane gas and/or high altitude
installations. The indicated kits must be used to ensure safe and
proper furnace operation. All conversions must be performed by
a qualified installer or service agency.
Gas Control Valve
This furnace is equipped with a 24-volt gas control valve
controlled during the furnace operation by the integrated control
module. As shipped, the gas control valve is configured for
Natural gas. The gas control valve is field-convertible for use with
propane gas by replacing the regulator spring with a propane gas
spring from an appropriate manufacturer’s propane gas
conversion kit. Taps for measuring the gas supply pressure and
manifold pressure are provided on the valve.
The gas control valve has a manual On/Off control located on the
gas control valve itself. This control may be set only to the “On”
or “Off” position.
Refer to the lighting instructions label or see “Start-Up Procedure
and Adjustment” for use of this control during the start-up and
shutdown periods.
Gas Piping Connections
CAUTION
To avoid possible unsatisfactory operation or equipment
damage due to underfiring of equipment, use the proper
size of Natural/propane
gas piping needed when running
Placeholder
pipe from the meter/tank to the furnace.
When sizing a trunk line, be sure to include all appliances which
will operate simultaneously when sizing a trunk line.
The gas piping supplying the furnace must be properly sized
based on the gas flow required, specific gravity of the gas and
the length of the run. The gas line installation must comply with
local codes, or in their absence, with the latest edition of the
National Fuel Gas Code, NFPA 54/ANSI Z223.1.
Natural Gas Capacity of Pipe—Cu ft of Gas Per Hour (CFH)
Length of Nominal Black Pipe Size
Pipe—
¹⁄₂ "
³⁄₄ "
1"
1¹⁄₄ "
ft (m)
1¹⁄₂ "
10 (3)
132
278
520
1,050
1,600
20 (6.1)
92
190
350
730
1,100
30 (9.2)
73
152
285
590
980
40 (12.2)
63
130
245
500
760
50 (15.2)
56
115
215
440
670
60 (18.3)
50
105
195
400
610
70 (21.3)
46
96
180
370
560
80 (24.4)
43
90
170
350
530
90 (27.4)
40
84
160
320
490
100 (30.5)
38
79
150
305
460
Pressure 0.5 psig or less and pressure drop of 0.3" W.C.; based
on 0.60 specific gravity gas
Btu/h Furnace Input
CFH =
Heating Value of Gas (Btu/cu ft
To connect the furnace to the building’s gas piping, the installer
must supply a ground joint union, drip leg, manual shutoff valve
and line and fittings to connect to the gas control valve. In some
cases, the installer may also need to supply a transition piece
from ¹⁄₂" (1.3 cm) pipe to a larger pipe size.
The following stipulations apply when connecting gas piping.
Refer to “Gas Piping Connections” illustrations for typical gas line
connections to the furnace.
■ Use black iron or steel pipe and fittings for building piping.
■ Where possible, use new pipe that is properly chamfered,
reamed and free of burrs and chips.
NOTE: If old pipe is used, be sure it is clean and free of rust,
scale, burrs, chips and old pipe joint compound.
■
■
■
■
Use pipe joint compound (pipe dope) on male threads only.
Always use pipe joint compound (pipe dope) that is approved
for all gases.
NOTE: Do not apply compound to the first 2 threads.
Use ground joint unions.
Install a drip leg to trap dirt and moisture before it can enter
the gas control valve. The drip leg must be a minimum of 3"
(7.6 cm) long.
27
■
■
Install a ¹⁄₈" NPT pipe plug fitting, accessible for test gage
connection, immediately upstream of the gas supply
connection to the furnace.
Always use a backup wrench when making the connection to
the gas control valve to keep it from turning.
NOTE: The orientation of the gas control valve on the
manifold must be maintained as shipped from the factory.
■
Maximum torque for the gas control valve connection is
375 in-lbs.
NOTE: Excessive overtightening may damage the gas control
valve.
■
Install a manual shutoff valve between the gas meter and the
furnace within 6 ft (1.8 m) of the furnace.
If a union is installed, the union must be downstream of the
manual shutoff valve, between the shutoff valve and the
furnace.
Tighten all joints securely.
Connect the furnace to the building piping by one of the
following methods:
1. Rigid metallic pipe and fittings.
2. Semirigid metallic tubing and metallic fittings.
NOTE: Aluminum alloy tubing must not be used in exterior
locations. In order to seal the grommet cabinet penetration,
rigid pipe must be used to reach the outside of the cabinet. A
semirigid connector to the gas piping may be used from
there.
■
■
■
■
■
■
■
Use listed gas appliance connectors in accordance with their
instructions.
Gas connectors must be fully in the same room as the
furnace.
Protect gas connectors and semirigid tubing against physical
and thermal damage when installed.
Ensure aluminum alloy tubing and connectors are coated to
protect against external corrosion when in contact with
masonry, plaster, insulation or subjected to repeated wetting
by liquids such as water (except rain water), detergents or
sewage.
Gas Piping Connections—Counterflow
A
B
J
I
C
H
G
D
E
F
A. Manual shutoff valve (upstream
from ground joint pipe union)
B. Alternate gas line location
C. Plug in alternate gas line hole
D. Gas control valve
E. Manifold
F. Burners
G. Ground joint pipe union
H. Grommet in standard gas line hole
I. Drip leg
J. Height required by local codes
Gas Piping Connections—Horizontal Upflow
C
D
A
B
E
J
I
Gas Piping Connections—Upflow
B
C
H
D
G
E
A. Gas control valve
B. Ground joint pipe union
C. Manual shutoff valve (upstream
from ground joint pipe union)
D. Drip leg
E. Grommet in standard gas line hole
A
J
F
I
H G
A. Alternate gas line location
B. Manifold
C. Gas control valve
D. Burners
E. Manual shutoff valve (upstream
from ground joint pipe union)
28
F. Height required by local codes
G. Drip leg
H. Grommet in standard gas line hole
I. Ground joint pipe union
J. Plug in alternate gas line hole
F
F. Drain trap
G. Plug in alternate gas line hole
H. Alternate gas line location
I. Manifold
J. Burners
Gas Piping Connections—Horizontal Counterflow
Gas Piping Checks
C
Before placing the furnace in operation, leak test the furnace and
gas connections.
D
A
B
WARNING
E
To avoid the possibility of explosion or fire, never use a
match or open flame to test for leaks.
J
I
F
H
G
A. Gas control valve
B. Ground joint pipe union
C. Manual shutoff valve (upstream
from ground joint pipe union)
D. Drip leg
E. Grommet in standard gas line hole
F. Drain trap
G. Plug in alternate gas line hole
H. Alternate gas line location
I. Manifold
J. Burners
Direct/Standard Inlet Piping
WARNING
Edges of sheet metal holes may be sharp. Use gloves as
a precaution when removing hole plugs.
When gas piping enters directly to the gas control valve through
the standard inlet hole, the installer must supply straight pipe
with a ground joint union to reach the exterior of the furnace. The
rigid pipe must be long enough to reach the outside of the
cabinet to seal the grommet cabinet penetration. A semirigid
connector to the gas piping can be used outside the cabinet per
local codes.
Indirect/Alternate Inlet Piping
When gas piping enters indirectly to the gas control valve through
the alternate gas inlet hole, the following fittings (starting from the
gas control valve) must be supplied to reach the outside of the
cabinet:
■ Coupling
■ 90º elbow
■ 2" close nipple
■ 90º elbow
■ Straight pipe with a ground joint union to reach the exterior of
the furnace.
NOTE: The rigid pipe must be long enough to reach the
outside of the cabinet so as to seal the grommet cabinet
penetration. A semirigid connector to the gas piping can be
used outside the cabinet per local codes.
Check for leaks using an approved chloride-free soap and water
solution, an electronic combustible gas detector, or other
approved testing methods.
NOTES:
■ Never exceed specified pressures for testing. Higher pressure
may damage the gas control valve and cause subsequent
overfiring, resulting in heat exchanger failure.
■ Disconnect this unit and external manual shutoff valve from
the gas supply piping system before pressure testing the
supply piping system with pressures in excess of ¹⁄₂ psig
(3.48 kPa).
■ Isolate this unit from the gas supply piping system by closing
the external manual gas shutoff valve before pressure testing
supply piping system with test pressures equal to or less than
¹⁄₂ psig (3.48 kPa).
Propane Gas Tanks and Piping
WARNING
If the gas furnace is installed in a basement, and
Placeholder
excavated area or a confined space,
it is strongly
recommended to contact a propane supplier to install a
gas detecting warning device in case of a gas leak.
— Since propane gas is heavier than air, any leaking can
settle in low areas or confined spaces.
— Propane gas odorant may fade, making the gas
undetectable except with a warning device.
A gas detecting warning system is the only reliable way to detect
a propane gas leak. Rust can reduce the level of odorant in
propane gas. Do not rely on your sense of smell. Contact a local
propane gas supplier about installing a gas detecting warning
system.
All propane gas equipment must conform to the safety standards
of the National Board of Fire Underwriters, NBFU Manual 58.
For satisfactory operation, propane gas pressure must be 11"
W.C. at the furnace manifold with all gas appliances in operation.
Maintaining proper gas pressure depends on 3 main factors:
■ Vaporization rate, depending on temperature of the liquid and
“wetted surface” area of the container or containers.
■ Proper pressure regulation. 2-stage regulation is
recommended for both cost and efficiency.
■ Pressure drop in the lines between the regulators, and
between 2nd stage regulator and the appliance. Pipe size will
depend on the length of the pipe run and the total load of all
appliances.
29
Propane Gas Installation—Typical
Complete information regarding tank sizing for vaporization,
recommended regulator settings, and pipe sizing is available
from most regulator manufacturers and propane gas suppliers.
Since propane gas will quickly dissolve white lead and most
standard commercial compounds, special pipe dope must be
used. Shellac-based compounds resistant to the actions of
liquefied petroleum gases, such as Gasolac®, Stalactic®, Clyde’s®
or John Crane® are satisfactory.
Refer to “Propane Gas Installation—Typical” for typical propane
gas installations and piping.
A
B
D
E
C
A. 1st stage regulator
B. 5 to 15 psig (20 psig maximum)
C. 200 psig maximum
D. 2nd stage regulator
E. Continuous 11" W.C.
Sizing Between 1st and 2nd Stage Regulator*
Maximum propane capacities listed are based on 2 psig pressure drop at 10 psig setting. Capacities in 1,000 Btu/h.
Propane Gas Piping Chart I
Tubing Size, O.D. Type L
Nominal Pipe Size Schedule 40
Pipe or Tubing Length—ft (m) ³⁄₈"
¹⁄₂"
⁵⁄₈"
³⁄₄"
⁷⁄₈"
¹⁄₂"
³⁄₄"
10 (3)
730
1,700
3,200
5,300
8,300
3,200
7,500
20 (6.1)
500
1,100
2,200
3,700
5,800
2,200
4,200
30 (9.2)
400
920
2,000
2,900
4,700
1,800
4,000
40 (12.2)
370
850
1,700
2,700
4,100
1,600
3,700
50 (15.2)
330
770
1,500
2,400
3,700
1,500
3,400
60 (18.3)
300
700
1,300
2,200
3,300
1,300
3,100
80 (24.4)
260
610
1,200
1,900
2,900
1,200
2,600
100 (30.5)
220
540
1,000
1,700
2,600
1,000
2,300
125 (38.1)
200
490
900
1,400
2,300
900
2,100
150 (45.7)
190
430
830
1,300
2,100
830
1,900
175 (53.3)
170
400
780
1,200
1,900
770
1,700
200 (61)
160
380
730
1,100
1,800
720
1,500
To convert to capacities at 15 psig settings—multiply by 1.13. To convert to capacities at 5 psig settings—multiply by 0.879.
Sizing Between Single or 2nd Stage Regulator and Appliance*
Maximum Propane Capacities Listed are Based on ¹⁄₂" W.C. pressure drop at 11" W.C. setting. Capacities in 1,000 Btu/h.
Propane Gas Piping Chart II
Tubing Size, O.D. Type L
Nominal Pipe Size Schedule 40
Pipe or Tubing Length—ft (m) ³⁄₈"
¹⁄₂"
⁵⁄₈"
³⁄₄"
⁷⁄₈"
¹⁄₂"
³⁄₄"
1"
1¹⁄₄"
1¹⁄₂"
10 (3)
39
92
199
329
501
275
567
1,071
2,205
3,307
20 (6.1)
26
62
131
216
346
189
393
732
1,496
2,299
30 (9.2)
21
50
107
181
277
152
315
590
1,212
1,858
40 (12.2)
19
41
90
145
233
129
267
504
1,039
1,559
50 (15.2)
18
37
79
131
198
114
237
448
913
1,417
60 (18.3)
16
35
72
121
187
103
217
409
834
1,275
80 (24.4)
13
29
62
104
155
89
185
346
724
1,066
100 (30.5)
11
26
55
90
138
78
162
307
630
976
125 (38.1)
10
24
48
81
122
69
146
275
567
866
30
Propane Gas Piping Chart II
Tubing Size, O.D. Type L
Nominal Pipe Size Schedule 40
Pipe or Tubing Length—ft (m) ³⁄₈"
¹⁄₂"
⁵⁄₈"
³⁄₄"
⁷⁄₈"
¹⁄₂"
³⁄₄"
1"
1¹⁄₄"
1¹⁄₂"
150 (45.7)
9
21
43
72
109
63
132
252
511
787
200 (61)
8
19
39
66
100
54
112
209
439
665
250 (76.2)
8
17
36
60
93
48
100
185
390
590
Data in accordance with NFPA pamphlet Number 54.
CIRCULATING AIR AND FILTERS
Ductwork—Airflow
WARNING
4. Using the scribe line along the duct flange as a guide, unfold
the duct flanges around the perimeter of the opening using a
pair of seamer pliers or seamer tongs.
NOTE: Airflow area will be reduced by approximately 18% if
duct flanges are not unfolded. This could cause performance
issues and noise issues.
Never allow the products of combustion, including carbon
monoxide, to enter the return ductwork or circulation air
supply.
■
■
■
■
■
■
■
Duct systems and register sizes must be properly designed
for the CFM and external static pressure rating of the furnace.
Design the ductwork in accordance with the recommended
methods of “Air Conditioning Contractors of America”
Manual D.
Install the duct system in accordance with Standards of the
National Board of Fire Underwriters for the Installation of Air
Conditioning, Warm Air Heating and Ventilating Systems.
Pamphlets No. 90A and 90B.
A closed return duct system must be used, with the return
duct connected to the furnace.
NOTE: Ductwork must never be attached to the back of the
furnace.
For upflow installations requiring 1,800 CFM or more, use
either 2 side returns or bottom return or a combination of side
/bottom.
Flexible joints may be used for supply and return connections
to reduce noise transmission.
To prevent the blower from interfering with combustion air or
draft when a central return is used, a connecting duct must
be installed between the unit and the utility room wall.
Never use a room, closet or alcove as a return air chamber.
Bottom Return Air Opening—Upflow Models]
The bottom return air opening on upflow models utilizes a “lance
and cut” method to remove sheet metal from the duct opening in
the base pan.
1. To remove, simply press out the lanced sections by hand to
expose the metal strips retaining the sheet metal over the
duct opening.
2. Using tin snips, cut the metal strips and remove the sheet
metal covering the duct opening.
3. In the corners of the opening, cut the sheet metal along the
scribe lines to free the duct flanges.
WARNING
Edges of sheet metal holes may be sharp. Use gloves as
a precaution when removing hole plugs.
Duct Flange Cutouts
A
B
D
C
A. Cut using tin snips.
B. Press out by hand.
C. Scribe lines outlining duct flanges.
D. Cut 4 corners after removing sheet metal.
When the furnace is used in connection with a cooling unit, the
furnace should be installed in parallel with or on the upstream
side of the cooling unit to avoid condensation in the heating
element. With a parallel flow arrangement, the dampers or other
means used to control the flow of air must be adequate to
prevent chilled air from entering the furnace and, if manually
operated, must be equipped with means to prevent operation of
either unit unless the damper is in the full heat or cool position.
When the furnace is installed without a cooling coil, it is
recommended that a removable access panel be provided in the
outlet air duct. This opening shall be accessible when the furnace
is installed and shall be of such a size that the heat exchanger
can be viewed for visual light inspection or such that a sampling
probe can be inserted into the airstream. The access panel must
be made to prevent air leaks when the furnace is in operation.
When the furnace is heating, the temperature of the return air
entering the furnace must be between 55°F and 100°F (13ºC and
38ºC).
31
Filters—Read This Section Before Installing the Return Air Ductwork
■
■
■
Filters must be used with this furnace. Discuss filter
maintenance with the building owner.
Filters do not ship with this furnace, but must be provided,
sized and installed externally by the installer.
Filters must comply with UL900 or CAN/ULCS111 standards.
If the furnace is installed without filters, the warranty will be
voided.
■
On upflow units, guide dimples locate the side return cutout
locations. Use a straight edge to scribe lines connecting the
dimples. Cut out the opening on these lines.
NOTE: An undersized opening will cause reduced airflow.
Refer to Minimum Filter Requirement charts to determine filter
area requirements.
Minimum Filter Requirements Chart
Upflow—Cooling Airflow Requirement (CFM)—Permanent Minimum Filter Area (sq. in.) Based On 600 ft
(182.9 m) Per Minute Filter Face Velocity
Input Airflow
600
800
1,000
1,200
1,400
1,600
2,000
0453_XA
376*
384
480
576
-
-
-
0704_XA
-
-
627*
627*
672
768
-
0905_XA
-
-
-
836*
836*
836*
960
1155_XA
-
-
-
940*
940*
940*
960
Counterflow—Cooling Airflow Requirement (CFM)—Permanent Minimum Filter Area (sq. in.) Based On
600 ft (182.9 m) Per Minute Filter Face Velocity
0704_XA
-
-
320*
320*
336
384
-
0905_XA
-
-
-
427*
427*
427*
480
Upflow—Cooling Airflow Requirement (CFM)—Permanent Minimum Filter Area (sq. in.) Based On 300 ft
(91.4 m) Per Minute Filter Face Velocity
0453_XA
376*
384
480
576
-
-
-
0704_XA
-
-
564*
564*
672
768
-
0905_XA
-
-
-
752*
752*
768
960
1155_XA
-
-
-
940*
940*
940*
960
Counterflow—Cooling Airflow Requirement (CFM)—Permanent Minimum Filter Area (sq. in.) Based On
300 ft (91.4 m) Per Minute Filter Face Velocity
0704_XA
-
-
641*
641*
672
768
-
0905_XA
-
-
-
854*
854*
854*
960
*Minimum filter area dictated by heating airflow requirement.
32
Filter Locations—Possible Upright Counterflow
Upright Installations
Depending on the installation and/or customer preference, filters
can be installed in the central return register or a side panel
external filter rack kit (upflows). As an alternative, a media air filter
or electronic air cleaner can be used as the requested filter.
The following illustrations show possible filter locations.
Filter Locations—Possible Upright Upflow
C
A
A
B
B
F
B
C
E
B
B
D
A. Central return grille
B. Filter
C. Airflow
D. Side return external filter rack kit (either side)
D
A. Filter access door
B. Filter
C. Central return grille
D. Airflow
E. Filter support bracket (provided)
F. Return duct
Horizontal Installations
Filters must be installed in either the central return register or in
the return air ductwork.
START-UP PROCEDURE AND ADJUSTMENT
This furnace must have a 115 VAC power supply properly
connected and grounded. Proper polarity must be maintained for
correct operation. In addition to the following start-up and
adjustment items, refer to further information in “Operational
Checks.”
Heat Anticipator Setting
The heat anticipator in the room thermostat must be correctly
adjusted to obtain the proper number of cycles per hour and to
avoid “overshooting” of the setting. Set the heat anticipator
setting to 0.7 amps. Follow the thermostat manufacturer’s
instructions on how to adjust the heat anticipator setting.
Drain Trap Priming
The drain trap must be primed prior to the furnace start-up. To
prime, fill the drain trap with water. This ensures proper furnace
drainage upon start-up and avoids the possibility of flue gases
escaping through the drain system.
Furnace Operation
1. Purge the gas lines of air prior to start-up.
NOTE: Be sure not purge lines into an enclosed burner
compartment.
2. Check for leaks using an approved chloride-free soap and
water solution, an electronic combustible gas detector or
other approved method.
3. Verify that all required kits (propane gas, high altitude, etc.)
have been appropriately installed.
Furnace Start-Up
1. Close the manual gas shutoff valve external to the furnace.
2. Turn off the electrical power to the furnace.
3. Set the room thermostat to the lowest possible setting.
4. Remove the burner compartment door.
NOTE: This furnace is equipped with an ignition device which
automatically lights the burner. Do not try to light the burner by hand.
5. Move the furnace gas control valve manual control to the Off
position.
6. Wait 5 minutes, and then check for a gas odor.
NOTE: Check near the floor as some types of gas are heavier than air.
7. If a gas odor is detected, follow the instructions in “Gas
Furnace Safety Precautions” in this manual.
8. If no gas odor is detected, move the furnace gas control valve
manual control to the On position.
9. Replace the burner compartment door.
10. Open the manual gas shutoff valve external to the furnace.
11. Turn on the electrical power to the furnace.
12. Adjust the thermostat to a setting above room temperature.
13. After the burners are lit, set the thermostat to the desired
temperature.
33
Honeywell 2-Stage Gas Control Valve—Model VR9205
Furnace Shutdown
1. Set the thermostat to the lowest setting.
The integrated control will close the gas control valve and
extinguish the flame. Following a 15-second delay, the
induced draft blower will be de-energized. After a 120-, 150-,
180- or 210-second delay period (field-selectable delay Off
[90, 120, 150, 180] plus a 30-second ramp down), the
circulator blower de-energizes.
2. Remove the burner compartment door and move the furnace
gas control valve manual control to the Off position.
3. Close the manual gas shutoff valve external to the furnace.
4. Replace the burner compartment door.
Gas Supply Pressure Measurement
A
B
D
A. Regulator vent
B. High-fire regulator adjust
C
C. Low-fire regulator adjust
D. On/Off selector switch
Gas Control Valve—Honeywell VR9205 Connected to
Manometer
CAUTION
C
B
To prevent unreliable operation or equipment damage,
the inlet gas supply pressure must be as specified on the
unit rating plate with all other household gas-fired
appliances operating.
A
D
E
The line pressure supplied to the gas control valve must be within
the range specified below. The supply pressure can be measured
at the gas control valve inlet pressure boss or at a hose fitting
installed in the gas piping drip leg. The supply pressure must be
measured with the burners operating. To measure the gas supply
pressure, use the following procedure.
i
F
Gas Control Valve—White-Rodgers 2-Stage 36G54
H
A
B
G
A. Open to atmosphere
B. Manometer hose
C. Common terminal (C)
D. High-fire coil terminal (HI)
C
A. Inlet
B. Outlet
C. On/Off selector switch
Gas Control Valve—White-Rodgers 36G54 Connected to
Manometer
B
A
C
D
E
F
K
L
J
A. Open to atmosphere
B. Manometer hose
C. Outlet pressure boss
D. High-fire regulator adjust
E. Regulator vent
F. Low-fire regulator adjust
34
I HG
G. Coaxial coil terminal (M)
H. Common terminal (C)
I. High-fire coil terminal (HI)
J. On/Off selector switch
K. Inlet pressure boss
L. Manometer
E. Low-fire coil terminal (LO)
F. ¹⁄₈" NPT inlet pressure tap
G. ¹⁄₈" NPT outlet pressure tap
H. Manometer
1. Turn off the gas to furnace at the manual gas shutoff valve
external to the furnace.
2. Disconnect all electrical power to the system.
3. Connect a calibrated water manometer (or appropriate gas
pressure gauge) at either the gas control valve inlet pressure
boss or the gas piping drip leg. See Gas Control Valve—
Honeywell VR9205 Connected to Manometer or Gas Control
Valve—White-Rodgers 36G54 Connected to Manometer for
location of inlet pressure boss/tap.
NOTE: If measuring the gas pressure at the drip leg or on the
Honeywell VR9205 gas control valve, a field-supplied hose barb
fitting must be installed prior to making the hose connection. If
using the inlet pressure boss on the White-Rodgers 36G54 gas
control valve, then use the 36G Valve Pressure Check Kit, Part
Number 0151K00000S.
4. Turn on the gas supply and operate the furnace and all other
gas consuming appliances on the same gas supply line.
5. Measure the furnace gas supply pressure with burners firing.
NOTE: Supply pressure must be within the range specified in the
Inlet Gas Supply Pressure chart.
Inlet Gas Supply Pressure
Natural Gas
Minimum: 5.0" W.C.
Maximum: 10.0" W.C.
Propane Gas
Minimum: 11.0" W.C.
Maximum: 13.0" W.C.
If the supply pressure differs from chart, make the necessary
adjustments to the pressure regulator, gas piping size, etc., and/
or consult with local gas utility.
6. Turn off the gas supply to the furnace at the manual shutoff
valve.
7. Disconnect the manometer.
8. Reinstall plug before turning on gas supply to furnace.
6. Turn off any unnecessary gas appliances started in Step 4.
Measuring Inlet Gas Pressure Alternate Method
A
B
C
D
G
F
E
A. Gas supply line
B. Gas shutoff valve
C. Gas supply line to furnace
D. Open to atmosphere
E. Manometer
F. Manometer hose
G. Dripleg cap with fitting
Gas Manifold Pressure Measurement and
Adjustment
CAUTION
To prevent unreliable operation or equipment damage,
the gas manifold pressure must be as specified on the
unit rating plate. Only minor adjustments should be made
by adjusting the gas control valve pressure regulator.
Only small variations in gas pressure should be made by
adjusting the gas control valve pressure regulator. The manifold
pressure must be measured with the burners operating. To
measure and adjust the manifold pressure, use the following
procedure.
1. Turn off the gas supply to furnace at the manual gas shutoff
valve external to the furnace.
2. Turn off all electrical power to the system.
3. Outlet pressure tap connections:
■ Honeywell VR9205 valve: Remove the outlet pressure
boss plug. Install an ¹⁄₈" NPT hose barb fitting into the
outlet pressure tap.
White-Rodgers 36G54 valve: Back outlet pressure test
screw (inlet/outlet pressure boss) out one turn
(counterclockwise, not more than one turn).
4. Attach a hose and manometer to the outlet pressure barb
fitting (Honeywell valve) or outlet pressure boss
(White-Rodgers valve).
5. Turn on the gas supply.
6. Turn on power and close thermostat R and W1 contacts to
provide a call for low-stage heat.
7. Measure the gas manifold pressure with burners firing.
8. Adjust manifold pressure using the Manifold Gas Pressure
chart shown below.
9. Remove the regulator cover screw from the low (LO) outlet
pressure regulator adjust tower.
10. Turn the screw clockwise to increase pressure or
counterclockwise to decrease pressure.
11. Replace regulator cover screw.
12. Close thermostat R and W2 contacts to provide a call for
high-stage heat.
13. Remove the regulator cover screw from the high (HI) outlet
pressure regulator adjust tower.
14. Turn the screw clockwise to increase pressure or
counterclockwise to decrease pressure.
15. Replace the regulator cover screw.
16. Turn off all electrical power and gas supply to the system.
17. Remove the manometer hose from the hose barb fitting or
outlet pressure boss.
18. Replace the outlet pressure tap:
■ Honeywell VR9205 valve: Remove the ¹⁄₈" NPT hose barb
fitting from the outlet pressure tap. Replace the outlet
pressure boss plug and seal with a high quality thread
sealer.
■ White-Rodgers 36G54 valve: Turn the outlet pressure test
screw in to seal pressure port (clockwise, 7 in-lb
minimum).
19. Turn on electrical power and gas supply to the system.
20. Close the thermostat contacts R and W1/W2 to energize the
valve.
21. Using a leak detection solution or soap suds, check for leaks
at the outlet pressure boss plug (Honeywell valve) or screw
(White-Rodgers valve). Bubbles forming indicate a leak.
IMPORTANT: If a leak is detected, turn off gas immediately
and repair all leaks.
■
NOTE: For gas-to-gas conversion, consult your dealer for
appropriate conversion.
Manifold Gas Pressure
Gas
Natural
Propane
Range
Nominal
Low Stage
1.6" to 2.2" W.C.
1.9" W.C.
High Stage
3.2" to 3.8" W.C.
3.5" W.C.
Low Stage
5.7" to 6.3" W.C.
6.0" W.C.
High Stage
9.7" to 10.3" W.C. 10.0" W.C.
35
Temperature Rise Measurement
Gas Input Rate Measurement—Natural Gas Only
The gas input rate to the furnace must never be greater than that
specified on the unit rating plate. To measure Natural gas input
using the gas meter, use the following procedure.
1. Turn off the gas supply to all other gas-burning appliances
except the furnace.
2. While the furnace is operating, time and record one complete
revolution of the smallest gas meter dial.
3. Calculate the number of seconds per cubic foot (sec/ft3) of
gas being delivered to the furnace. If the dial is a one cubic
foot dial, divide the number of seconds recorded in Step 2 by
one. If the dial is a 2 cubic foot dial, divide the number of
seconds recorded in Step 2 by 2.
4. Calculate the furnace input in Btu per hour (Btu/h). Input
equals the sum of the installation’s gas heating value and a
conversion factor (hours to seconds) divided by the number
of seconds per cubic foot. The measured input must not be
greater than the input indicated on the unit rating plate.
Example: Installation’s gas heating (HTG) value: 1,000 Btu/ft3
(Obtained from gas supplier)
Installation’s seconds per cubic foot: 34 sec/ft3
Rise = Supply air temperature - Return air temperature
A
B
C
D
E
A. Heat exchanger radiation
“line of sight”
B. Supply air
C. Supply air temperature
D. Return air temperature
E. Return air
Conversion Factor (hours to seconds): 3,600 sec/h
Input = (Htg. value x 3,600) ÷ seconds per cubic foot
Circulator Blower Speeds
Input = (1,000 Btu/ft3 x 3,600 sec/h) ÷ 34 sec/ft3
Input = 106,000 Btu/h
Minor changes to the input rate may be accomplished through
manifold pressure adjustments at the gas control valve. Refer to
“Gas Manifold Pressure Measurement and Adjustment” in
“Start-Up Procedure and Adjustment” section for details.
NOTE: The final manifold pressure cannot vary by more than ±
0.3" W.C. from the specified setting. Consult your local gas
supplier if additional input rate adjustment is required.
5. Repeat steps 2 through 4 on high stage.
6. Turn on the gas supply to all other appliances turned off in
Step 1. Be certain that all appliances are functioning properly
and that all pilot burners are lit and operating.
Temperature Rise
Temperature rise must be within the range specified on the unit
rating plate. An incorrect temperature rise may result in
condensing in or overheating of the heat exchanger. An airflow
and temperature rise table is provided in the Specification Sheet
applicable to your model. Determine and adjust temperature rise
as follows:
1. Operate furnace with burners firing for approximately
10 minutes.
2. Ensure that all registers are open and all duct dampers are in
their final (fully or partially open) position.
3. Place thermometers in the return and supply ducts as close
to the furnace as possible. Thermometers must not be
influenced by radiant heat from the heat exchanger.
4. Subtract the return air temperature from the supply air
temperature to determine the air temperature rise. Allow
adequate time for thermometer readings to stabilize.
5. Adjust the temperature rise by adjusting the circulator blower
speed. Increase blower speed to reduce temperature rise.
Decrease blower speed to increase temperature rise. Refer to
“Circulator Blower Speeds” in “Start-Up Procedure and
Adjustment” for speed changing details.
36
WARNING
To avoid personal injury or death due to electrical shock,
turn OFF power to the furnace before changing speed taps.
This furnace is equipped with a multispeed circulator blower. This
blower provides ease in adjusting blower speeds. The
Specification Sheet applicable to your model provides an airflow
table, showing the relationship between airflow (CFM) and
external static pressure (E.S.P.), for the proper selection of
heating and cooling speeds. The heating blower speed is
shipped set at B, and the cooling blower speed is set at D. These
blower speeds should be adjusted by the installer to match the
installation requirements so as to provide the correct heating
temperature rise and correct cooling CFM.
Use the dual 7-segment LED display adjacent to the DIP
switches to obtain the approximate airflow quantity. The airflow
quantity is displayed as a number on the display, rounded to the
nearest 100 CFM. The display alternates airflow delivery
indication and the operating mode indication.
Example: The airflow being delivered is 1,225 CFM. The
display indicates 12. If the airflow being delivered is 1,275,
the display indicates 13.
1. Determine the tonnage of the cooling system installed with
the furnace. If the cooling capacity is in Btu/h, divide it by
12,000 to convert capacity to Tons.
Example: Cooling Capacity of 30,000 Btu/h
30,000/12,000 = 2.5 Tons
2. Determine the proper airflow for the cooling system. Most
cooling systems are designed to work with airflows between
350 and 450 CFM per ton. Most manufacturers recommend
an airflow of about 400 CFM per ton.
Example: 2.5 tons X 400 CFM per ton = 1,000 CFM
NOTE: The cooling system manufacturer’s instructions must be
checked for required airflow. Any electronic air cleaners or other
devices may require specific airflows, consult installation
instructions of those devices for requirements.
3. Knowing the furnace model, locate the high-stage cooling
airflow charts in the Specification Sheet applicable to your
model. Look up the cooling airflow determined in Step 2 and
find the required cooling speed and adjustment setting.
Example: A WGFM295070V4C furnace installed with a
2.5 ton air conditioning system. The airflow needed is
1,000 CFM. Looking at the cooling speed chart for
WGFM295070V4C, find the airflow closest to 1,000 CFM. A
cooling airflow of 990 CFM can be attained by setting the
cooling speed to B and the adjustment to “+” (plus).
4. Continuous fan speed is 30% of the furnace’s maximum
airflow capability.
Example: If the furnace’s maximum airflow capability is
2,000 CFM, the continuous fan speed will be
0.30 x 2,000 CFM = 600 CFM.
5. Locate the blower speed selection DIP switches on the
integrated control module. Select the desired cooling speed
tap by positioning DIP switches 1 and 2 appropriately. Select
the desired adjust tap by positioning DIP switches 3 and
4 appropriately. Refer to the following charts for DIP switch
positions and their corresponding taps. Verify CFM by noting
the number displayed on the dual 7-segment LED display.
Comfort Mode Profiles
The multispeed circulator blower also offers several custom On/
Off ramping profiles. These profiles may be used to enhance the
cooling performance and increase the comfort level. The ramping
profiles are selected using DIP switches 5 and 6. See the “Profile”
illustrations for DIP switch positions and their corresponding
taps. Verify CFM by noting the number displayed on the dual
7-segment LED display.
DIP Switch
Number
Ramping Profile Tap
5
6
A*
Off
Off
B
On
Off
C
Off
On
D
On
On
* Indicates factory setting
Profile A
Provides a 1 minute Off delay at 100% of the cooling demand
airflow.
■
Speed Selection DIP Switches
Cool
Selection
Switches
Adjust
Selection
Switches
Profile
Selection
Switches
Heat
Selection
Switches
Tap
1
2
3
4
5
6
7
8
A
Off
Off
Off
Off
Off
Off
Off
Off
B
On
Off
On
Off
On
Off
On
Off
C
Off
On
Off
On
Off
On
Off
On
D
On
On
On
On
On
On
On
On
100% CFM
100% CFM
Off
Off
Cooling
Demand
1 min
Profile B
■
■
■
Ramps up to 50% of the full cooling demand airflow for
30 seconds.
The motor then ramps to 100% of the required airflow.
Provides a 1 minute Off delay at 100% of the cooling demand
airflow.
Switch Bank: S3
100% CFM
Off
DIP Switch Number
Cooling Tap
1
2
A
Off
Off
B
On
Off
C
Off
On
D*
On
On
*Indicates factory setting
Cooling Demand
Profile C
■
■
Ramps up to 82% of the full cooling demand airflow for
approximately 7¹⁄₂ minutes.
The motor then ramps to 100% of the required airflow.
Provides a 1 minute Off delay at 100% of the cooling demand
airflow.
Switch Bank: S3
Off
DIP Switch Number
82% CFM
100% CFM
7¹⁄₂ min
Adjust Tap
3
4
Normal*
Off
Off
+10% Adjust
On
Off
-10% Adjust
Off
On
Normal
On
On
Off
1 min
¹⁄₂ min
■
Speed Taps—Adjust
100% CFM
50% CFM
100% CFM
Off
1 min
Cooling Demand
* Indicates factory setting
37
Profile D
To Set Airflow
Ramps up to 50% of the full cooling demand airflow for
30 seconds.
Then ramps to 82% of the full cooling demand airflow for
approximately 7¹⁄₂ minutes.
The motor then ramps to 100% of the required airflow.
Provides a 30-second Off delay at 50% of the cooling
demand airflow.
■
■
■
■
50% CFM
Off
82% CFM
30 sec
50% CFM
100% CFM
Off
30 sec
7¹⁄₂ min
Cooling Demand
6. Select the heating speed from the heating speed chart in the
Specification Sheet for your model. The Adjust Taps setting
(already established by the cooling speed selection)
determines which set of speeds are available. The selected
speed must provide a temperature rise within the rise range
listed with the particular model.
Example: The WGFM290508V4C is set for 990 CFM on
cooling, the “ADJUST” is set to “+” (plus). The 4 heating
speeds available are “A Plus,” “B Plus,” “C Plus” and “D
Plus.” “A Plus” has a rise of 44°F for both stages which is
within the 30-60°F rise range for the WGFM290508V4C. This
setting will keep electrical consumption to a minimum. Set
the “Heat” speed DIP switches to “A.”
1.
2.
3.
4.
5.
6.
7.
Select the model and desired high-stage cooling airflow.
Determine the corresponding tap (A, B, C, or D).
Set DIP switches 1 and 2 to the appropriate On/Off positions.
Select the model and desired high-stage heating airflow.
Determine the corresponding tap (A, B, C, or D).
Set DIP switches 7 and 8 to the appropriate On/Off positions.
Select the airflow adjustment factor taps (A and D are 1; Tap
B is +10; Tap C -10).
8. Set DIP switches 3 and 4 to the appropriate On/Off positions.
To Set Comfort Mode
1. Select desired comfort mode profile. See Comfort Mode
Profile chart.
2. Set DIP switches 5 and 6 to the appropriate On/Off positions.
Model
Tap
2
3
4
5
WGFM295045V3B
A
425
650
560
800
B
585
700
630
900
C
715
1,100 700
1,000
D
780
1,200 770
1,100
A
425
650
875
1,250
945
1,250
Switch Bank: S4
DIP Switch Number
WGFM295070V4C
Heating Tap
7
8
B
585
900
A
Off
Off
C
860
1,325 1,015 1,450
B*
On
Off
D
1,040 1,600 1,085 1,858
C
Off
On
A
520
800
D
On
On
B
685
1,050 1,190 1,700
C
945
1,450 1,260 1,800
D
1,300 2,000 1,380 1,900
A
520
800
B
685
1,050 1,330 1,900
C
945
1,450 1,365 1,950
D
1,300 2,000 1,400 2,000
A
425
650
875
1,250
B
585
900
945
1,350
C
860
1,325 1,015 1,450
D
1,040 1,600 1,085 1,550
A
520
800
B
685
1,050 1,190 1,700
C
945
1,450 1,260 1,800
D
1,300 2,000 1,330 1,900
WGFM295090V5D
*Indicates factory setting
7. Select the desired heating speed tap by positioning DIP
switches 7 and 8 appropriately. Verify CFM by noting the
number displayed on the dual 7-segment LED display.
In general, lower heating speeds will reduce electrical
consumption, lower operating sound levels of the blower and
increase the outlet air temperature delivered to the home. The
speeds available allow the blower performance to be optimized
for the particular homeowner’s needs.
WGFM295115V5D
WGFM293070V4C
Profiles
Pre-Run
Short-Run
Off -Delay
A
-
-
60 sec/100
B*
-
30 sec/50
60 sec/100
C
-
7.5 min/82
60 sec/100
D
30 sec/50
7.5 min/82
30 sec/50
*Indicates factory setting
38
WGFM2930905V5D
1,120 1,600
1,295 1,850
1,120 1,600
Blower Heat Off Delay Timings
The integrated control module provides a selectable heat-off
delay function. The heat off delay period may be set to 90, 120,
150 or 180 seconds using the DIP switches or jumper provided
on the control module. The delay is factory-shipped at
150 seconds, but may be changed to suit the installation
requirements and/or homeowner preference. Refer to the
following chart for DIP switch positions and corresponding delay
times.
Switch Bank: S1
DIP Switch Number
Heat-Off Delay
1
2
90 seconds
Off
Off
120 seconds
On
Off
150 seconds*
Off
On
180 seconds
On
On
*Indicates factory setting
NORMAL SEQUENCE OF OPERATION
■
Power Up
The normal power up sequence is as follows:
■ 115 VAC power applied to furnace.
■ Integrated control module performs internal checks.
■ Integrated control module displays “88” on the dual
7-segment LED display.
■ Integrated control module monitors safety circuits
continuously.
■ Furnace awaits call from thermostat. Displays “OP” on the
dual 7-segment LED display.
■
■
■
■
Heating Mode
The normal operational sequence in heating mode is as follows:
■ R and W1 (or R and W1/W2) thermostat contacts close,
initiating a call for heat.
■ Integrated control module performs safety circuit checks.
■ Induced draft blower is energized on high speed for a
15-second prepurge. Humidifier terminal is energized with
induced draft blower.
■ Induced draft blower steps to low speed following prepurge.
Low-stage pressure switch contacts are closed.
■ Igniter warm-up begins upon step to low speed and presence
of closed low-stage pressure switch contacts.
■ Gas control valve opens at the end of the igniter warm-up
period, delivering gas to the burners and establishing a flame.
■ Integrated control module monitors flame presence. Gas
control valve will remain open only if flame is detected.
■ If the thermostat call is for low heat, the gas control valve and
induced draft blower will continue on low stage. If the call is
for high heat, the gas control valve and induced draft blower
will change to high stage.
■ Circulator blower is energized on heat speed following a fixed
30-second blower-on delay. The circulator blower requires
30 seconds to ramp up to full speed. Electronic air cleaner
terminal is energized with circulator blower.
■ Furnace is now operating on the specified stage called for by
the 2-stage thermostat.
■ Furnace runs, integrated control module monitors safety
circuits continuously.
■ If the 2-stage thermostat changes the call from low heat to
high heat, the integrated control module will immediately
switch the induced draft blower, gas control valve and
circulator blower to their high-stage settings.
■
■
■
If the 2-stage thermostat changes the call from high heat to
low heat, the integrated control module will immediately
switch the induced draft blower and gas control valve to their
low-stage settings. The circulator blower will remain on
high-heating speed for 30 seconds before switching to the
low-heat circulating speed.
R and W1 (or R and W1/W2) thermostat contacts open,
completing the call for heat.
Gas control valve closes, extinguishing flame.
Induced draft blower is de-energized following a 15-second
post purge. Humidifier terminal is de-energized.
Circulator blower continues running for the selected heat-off
delay period (90, 120, 150 or 180 seconds). The speed run
during this period depends on the last heat call provided by
the thermostat. If the last call for heat was a call for low heat,
the air circulator motor will run on low heat speed for the
duration of the heat-off delay period (90, 120, 150 or
180 seconds). If the last call for heat was a call for high heat,
the air circulating motor will run on the high heating speed for
30 seconds and then switch to the low-heating speed for the
balance of the heat-off delay period (60, 90, 120 or
150 seconds).
Circulator blower and electronic air cleaner terminals are deenergized.
Circulator blower ramps down to Off during the 30 seconds
following the heat-off delay period.
Furnace awaits next call from thermostat.
Cooling Mode
The normal operational sequence in cooling mode is as follows:
■ R and Y1/G or Y2/G thermostat contacts close, initiating a
call for cool.
■ Integrated control module performs safety circuit checks.
■ Outdoor fan and compressor are energized to their
appropriate speeds.
■ Circulator blower is energized on the appropriate cool speed
at the level and time determined by the selected ramping
profile. Electronic air cleaner terminals are energized with
circulator blower.
■ Furnace circulator blower and outdoor cooling unit run their
appropriate speed; Integrated control module monitors safety
circuits continuously.
■ R and Y1/G or Y2/G thermostat contacts open, completing
the call for cool.
■ Outdoor fan and compressor are de-energized.
39
■
■
■
Circulator blower continues running during a cool-off delay
period. The Off delay time and airflow level are determined by
the selected ramping profile.
Electronic air cleaner terminal and circulator blower are
de-energized.
Furnace awaits next call from thermostat.
Fan Only Mode
The normal operational sequence in fan only mode is as follows:
■ R and G thermostat contacts close, initiating a call for fan.
■ Integrated control module performs safety circuit checks.
■ Circulator blower is energized on continuous fan speed (30%
of the furnace’s maximum airflow capability) following a
5-second delay. Electronic air cleaner terminal is energized.
■ Circulator blower runs; integrated control module monitors
safety circuits continuously.
■ R and G thermostat contacts open, completing the call for
fan.
■ Electronic air cleaner terminal and circulator blower are
de-energized.
■ Furnace awaits next call from thermostat.
Operational Checks
Burner Flame
The burner flames should be inspected with the burner
compartment door installed. Flames should be stable, soft and
blue (dust may cause orange tips but must not be yellow). The
flames must extend directly outward from the burner without
curling, floating or lifting off. Flames must not impinge on the
sides of the heat exchanger firing tubes.
Burner Flame
Check the burner flames for good adjustment, a stable, soft and
blue flame that is not curling, floating or lifting off.
SAFETY CIRCUIT DESCRIPTION
A number of circuits are employed to ensure proper furnace
operation. These circuits serve to control any potential safety
hazards and serve as inputs in the monitoring and diagnosis of
abnormal function. These circuits are continuously monitored
during furnace operation by the integrated control module.
Integrated Control Module
The integrated control module is an electronic device which, if a
potential safety concern is detected, will take the necessary
precautions and provide diagnostic information through an LED.
Primary Limit Control
The primary limit control is located on the partition panel and
monitors heat exchanger compartment temperatures. It is a
normally closed (electrically), automatic reset, temperatureactivated sensor. The limit guards against overheating as a result
of insufficient conditioned air passing over the heat exchanger.
Auxiliary Limit Controls
The auxiliary limit controls are located on or near the circulator
blower and monitors blower compartment temperatures. They
are normally-closed (electrically), manual-reset sensors. These
limits guard against overheating as a result of insufficient
conditioned air passing over the heat exchanger.
40
Rollout Limit Controls
The rollout limit controls are mounted on the burner/manifold
assembly and monitor the burner flame. They are normallyclosed (electrically), manual-reset sensors. These limits guard
against burner flames not being properly drawn into the heat
exchanger.
Pressure Switches
The pressure switches are normally-open (closed during
operation), negative air pressure-activated switches. They
monitor the airflow (combustion air and flue products) through
the heat exchanger via pressure taps located on the induced
draft blower and the coil front cover. These switches guard
against insufficient airflow (combustion air and flue products)
through the heat exchanger and/or blocked condensate drain
conditions.
Flame Sensor
The flame sensor is a probe mounted on the burner/manifold
assembly which uses the principle of flame rectification to
determine the presence or absence of flame.
MAINTENANCE
WARNING
HIGH VOLTAGE!
To avoid personal injury or death due to
electrical shock, disconnect electrical power
before performing any maintenance. If you
must handle the igniter, handle with care.
Touching the igniter element with bare fingers,
rough handling or vibration could damage the igniter
resulting in premature failure. Only a qualified servicer
should ever handle the igniter.
Annual Inspection
The furnace should be inspected by a qualified installer, or
service agency at least once per year. This check should be
performed at the beginning of the heating season. This will
ensure that all furnace components are in proper working order
and that the heating system functions appropriately. Pay
particular attention to the following items. Repair or service as
necessary.
■ Flue pipe system. Check for blockage and/or leakage. Check
the outside termination and the connections at and internal to
the furnace.
■ Heat exchanger. Check for corrosion and/or buildup within
the heat exchanger passageways.
■ Burners. Check for proper ignition, burner flame and flame
sense.
■ Drainage system. Check for blockage and/or leakage. Check
hose connections at and internal to furnace.
■ Wiring. Check electrical connections for tightness and/or
corrosion. Check wires for damage.
■ Filters
To remove filters from an external filter rack in an upright upflow
installation, follow the directions provided with external filter rack
kit.
Horizontal Unit Filter Removal
Filters in horizontal installations are located in the central return
register or the ductwork near the furnace.
To remove:
1. Turn off electrical power to the furnace.
2. Remove the filter(s) from the central return register or
ductwork.
3. Replace the filter(s) by reversing the procedure for removal.
4. Turn on electrical power to the furnace.
Media Air Filter or Electronic Air Cleaner Removal
Follow the manufacturer’s directions for service.
Burners
Visually inspect the burner flames periodically during the heating
season. Turn on the furnace at the thermostat and allow several
minutes for flames to stabilize, since any dislodged dust will alter
the flames normal appearance. Flames should be stable, quiet,
soft and blue (dust may cause orange tips but they must not be
yellow). They should extend directly outward from the burners
without curling, floating or lifting off. Flames must not impinge on
the sides of the heat exchanger firing tubes.
Induced Draft and Circulator Blowers
The bearings in the induced draft blower and circulator blower
motors are permanently lubricated by the manufacturer. No
further lubrication is required. Check motor windings for
accumulation of dust which may cause overheating. Clean as
necessary.
Filters
CAUTION
To ensure proper unit performance, adhere to the filter
sizes given in the Recommended Minimum Filter Size
chart or Specification Sheet applicable to your model.
Filter Maintenance
Improper filter maintenance is the most common cause of
inadequate heating or cooling performance. Filters should be
cleaned (permanent) or replaced (disposable) every 2 months or
as required. When replacing a filter, it must be replaced with a
filter of the same type and size.
Filter Removal
Condensate Trap and Drain System
(Qualified Servicer Only)
Annually inspect the drain tubes, drain trap and field-supplied
drain line for proper condensate drainage. Check drain system
for hose connection tightness, blockage and leaks. Clean or
repair as necessary.
Flame Sensor (Qualified Servicer Only)
Under some conditions, the fuel or air supply can create a nearly
invisible coating on the flame sensor. This coating acts as an
insulator causing a drop in the flame sense signal. If the flame
sense signal drops too low, the furnace will not sense flame and
will lock out. The flame sensor should be carefully cleaned by a
qualified servicer using emery cloth or steel wool. Following
cleaning, the flame sense signal should be as indicated in the
Specifications Sheet.
Depending on the installation, differing filter arrangements can be
applied. Filters can be installed in either the central return register
or a side panel external filter rack (upflow only). A media air filter
or electronic air cleaner can be used as an alternate filter. Follow
the filter sizes given in the Recommended Minimum Filter Size
chart to ensure proper unit performance.
41
Flue Passages (Qualified Servicer Only)
The heat exchanger flue passageways should be inspected at the
beginning of each heating season. If necessary, clean the
passageways as outlined below.
1. Turn off the electrical power and gas supply to the furnace.
2. Disconnect the gas line and remove the burner/manifold
assembly by removing the screws securing the assembly to
the partition panel.
3. Disconnect the flue pipe system from the induced draft
blower.
4. Remove the induced draft blower and, drain and pressure tap
hoses from the recuperator coil front cover.
5. Remove the recuperator coil front cover to expose the coil
tubes and turbulators.
6. Remove the recuperator coil turbulators individually by slowly
pulling each turbulator forward firmly.
7. Clean the recuperator coil tubes using a long handle wire
brush, such as a gun cleaning brush.
8. Clean the primary heat exchanger tubes using a wire brush
attached to a length of high grade stainless steel cable, such
as drain cleanout cable. Attach a variable speed reversible
drill to the other end of the cable. Slowly rotate the cable with
the drill and insert it into one of the heat exchanger tubes.
While reversing the drill, work the cable in and out several
times to obtain sufficient cleaning. Repeat for each tube.
9. Clean the residue from the furnace by using a vacuum
cleaner.
10. Replace the parts removed in the previous steps in reverse
order.
11. Turn on electrical power and gas to furnace. Check for leaks
and proper unit operation.
12. Severe heat exchanger fouling is an indication of an
operational problem. Perform the checks listed in “Start-Up
Procedure and Adjustments” to reduce the chances of
repeated fouling.
Before Leaving an Installation
■
■
■
Cycle the furnace with the thermostat at least 3 times. Verify
cooling and fan only operation.
Review the Owner’s Manual with the homeowner and discuss
proper furnace operation and maintenance.
Leave literature packet near furnace.
Repair and Replacement Parts
When ordering any of the listed functional parts, be sure to
provide the furnace model, manufacturing and serial numbers
with the order.
Although only functional parts are shown in the parts list, all sheet
metal parts, doors, etc., may be ordered by description.
Parts are available from your distributor.
Functional Parts List
■
Gas Control Valve
■
Blower Motor
■
Gas Manifold
■
Blower Wheel
■
Natural Gas Orifice
■
Blower Mounting Bracket
■
Propane Gas Orifice
■
Blower Cutoff
■
Igniter
■
Blower Housing
■
Flame sensor
■
Inductor
■
Rollout Limit Switch
■
Heat Exchanger
■
Primary Limit Switch
■
Recuperator Coil
■
Auxiliary Limit Switch
■
Coil Front Cover
■
Pressure Switch
■
Integrated Control Module
■
Induced Draft Blower
■
Transformer
■
Door Switch
TROUBLESHOOTING
Electrostatic Discharge (ESD) Precautions
NOTE: Discharge static electricity accumulated in the body
before touching the unit. An electrostatic discharge can adversely
affect electrical components.
Use the following steps during furnace installations and servicing
to protect the integrated control module from damage. By putting
the furnace, the control and the person at the same electrostatic
potential, these steps will help avoid exposing the integrated
control module to electrostatic discharge. This procedure is
applicable to both installed and uninstalled (ungrounded)
furnaces.
1. Disconnect all power to the furnace. Do not touch the
integrated control module or any wire connected to the
control prior to discharging your body’s electrostatic charge
to ground.
2. Firmly touch a clean, unpainted, metal surface of the furnace
away from the control. Any tools held in a person’s hand
during grounding will be discharged also.
42
3. Service the integrated control module or connecting wiring
after following the discharge process in Step 2.
NOTE: Do not recharge your body with static electricity by
moving or shuffling your feet or touching ungrounded
objects. Repeat Step 2 if you touch an ungrounded object.
4. Follow steps 1 through 3 before removing a new control from
its container or installing the control on a furnace. Return any
old or new controls to their containers before touching any
ungrounded object.
Fault Recall
The ignition control is equipped with a momentary pushbutton
switch that can be used to display the last 6 faults on the dual
7-segment LED display. The control must be in Standby Mode
(no thermostat inputs) to use the feature. Depress the switch for
approximately 2 seconds. Release the switch when the LED
display is turned off. The last 6 faults will be displayed most
recent to least recent on the dual 7-segment LED display.
NOTE: Consecutively repeated faults are stored a maximum of
3 times. For example, a clogged return air filter causes the
furnace limit to trip repeatedly. The control will only store this fault
the first 3 consecutive times the fault occurs.
Resetting from Lockout
Furnace lockout results when a furnace is unable to achieve
ignition after 3 attempts during a single call for heat. It is
characterized by a nonfunctioning furnace and a “E0” code
displayed on the dual 7-segment display. If the furnace is in
“lockout,” it will (or can be) reset in any of the following ways.
1. Automatic reset. The integrated control module will
automatically reset itself and attempt to resume normal
operations following a 1-hour lockout period.
2. Manual power interruption. Interrupt 115-volt power to the furnace.
3. Manual thermostat cycle. Lower the thermostat so that there
is no longer a call for heat for 1 to 20 seconds, and then reset
to previous setting.
NOTE: If the condition which originally caused the lockout still exists,
the control will return to lockout. Refer to the “Diagnostic Chart.”
Status Codes
b 0 Blower motor not running
Internal control fault/no power
O P Normal operation
b 1 Blower communication error
E 0 Lockout due to excessive retries
b 2 Blower HP mismatch
E 1 Low-stage pressure switch stuck closed at start of heating cycle
b 3 Blower motor operating in power, temperature or speed limit
E 2 Low-stage pressure switch stuck open
b 4 Blower motor current trip or lost rotor
E 3 Open high-limit switch
b 5 Blower motor locked rotor
E 4 Flame detected when no flame should be present
b 6 Over/under voltage trip or over temperature trip
E 5 Open fuse
b 7 Incomplete parameters sent to motor
E 6 Low flame signal
b 9 Low indoor airflow
E 7 Igniter fault or improper grounding
C 1 Low-stage cooling
E 8 High-stage pressure switch stuck closed at start of heating cycle
C 2 High-stage cooling
E 9 High-stage pressure switch stuck open
L O Low-stage heat
E A Reversed 115 VAC polarity
H I
d 0 Data not yet on network
d 4 Invalid memory card data
High-stage heat
F Continuous fan
1 2 CFM/100; Alternates with C1, C2, LO, HI, F
Diagnostic Chart
WARNING
HIGH VOLTAGE!
To avoid personal injury or death due to electrical shock, disconnect electrical power
before performing any service or maintenance.
The dual 7-segment LED display will display an error code that may contain a letter and number. The error code may be used to assist
in troubleshooting the unit.
43
Symptoms of
Abnormal
Operation
■
■
Furnace fails to
operate.
Integrated
control module
diagnostic LED
display
provides no
signal.
Diagnostic/
Staus LED
Code
Fault Description Possible Causes
None
■
■
■
No 115-volt
power to
furnace, or no
24-volt power to
integrated
control module.
Blown fuse or
circuit breaker.
Internal fault in
Integrated
control module.
■
■
■
Manual disconnect
switch Off, door
switch open or
24-volt wire
improperly
connected or
loose.
Blown fuse or
circuit breaker
Integrated control
module has an
internal fault.
Corrective Actions
■
■
■
■
Notes and Cautions
Assure 115-volt power
to the furnace, and 24volt power to
integrated control
module
Check integrated
control module fuse.
Replace with 3A
automotive fuse, if
necessary.
Check for possible
shorts in 115-volt and
24-volt circuits. Repair
as necessary.
Replace bad
integrated control
module.
■
■
■
■
Turn off power prior to
repair.
Replace integrated
control module fuse
with 3A automotive
fuse.
Read precautions in
“Electrostatic
Discharge” section of
manual.
Replace integrated
control module with
current replacement
parts.
■
LED display
indicates “OP.”
OP
■
Normal
operation
■
Normal operation
■
None
■
Normal operation
■
Furnace fails to
operate.
Integrated
control module
LED display
provides “E0”
error code.
E0
■
Furnace lockout
due to an
excessive
number of
ignition “retries”
(3 total).
■
Failure to establish
flame. Cause may
be no gas to
burners, front cover
pressure switch
stuck open, bad
igniter or igniter
alignment,
improper orifices or
coated/oxidized or
improperly
connected flame
sensor.
Loss of flame after
establishment.
Cause may be
interrupted gas
supply, lazy burner
flames (improper
gas pressure or
restriction in flue
and/or combustion
air piping), front
cover pressure
switch opening, or
improper induced
draft blower
performance.
■
Locate and correct gas
interruption.
Check front cover
pressure switch
operation (hose,
wiring, contact
operation). Correct if
necessary.
Replace or realign
igniter. Igniter is fragile,
handle gently.
Check flame sense
signal. Sand sensor if
coated and/or
oxidized.
Check flue piping for
blockage, proper
length, elbows and
termination.
Verify proper induced
draft blower
performance.
■
Turn off power prior to
repair.
Igniter is fragile,
handle with care.
Sand flame sensor
with emery cloth.
See “Vent/Flue Pipe”
section for piping
details.
Low-stage
pressure switch
contacts sticking.
Shorts in pressure
switch circuit
wiring.
■
Replace low-stage
pressure switch.
Repair short in wiring.
■
■
■
■
■
Furnace fails to
operate.
Integrated
control module
LED display
provides “E1”
error code.
E1
■
Low-stage
pressure switch
circuit is closed
at start of
heating cycle.
■
■
■
■
■
■
■
■
■
■
■
■
Turn off power prior to
repair.
Replace pressure
switch with correct
replacement part.
Symptoms of
Abnormal
Operation
■
■
Induced draft
blower runs
continuously
with no further
furnace
operation.
Integrated
control module
LED display
provides “E2”
error code.
Diagnostic/
Staus LED
Code
Fault Description Possible Causes
E2
■
Low-stage
pressure switch
circuit is not
closed.
■
■
■
■
■
■
Circulator
blower runs
continuously.
No furnace
operation.
Integrated
control module
LED display
provides “E3”
error code.
E3
■
■
Primary limit or
auxiliary limit
circuit is open.
Rollout limit
circuit is open.
■
■
■
■
Corrective Actions
Pressure switch
hose blocked,
pinched or
connected
improperly.
Blocked flue and/or
inlet air pipe,
blocked drain
system or weak
induced draft
blower.
Incorrect pressure
switch setpoint or
malfunctioning
switch contacts.
Loose or
improperly
connected wiring.
■
Insufficient
conditioned air
over the heat
exchanger.
Blocked filters,
restrictive
ductwork, improper
circulator blower
speed, or failed
circulator blower.
Flame rollout.
Misaligned
burners, blocked
flue and/or air inlet
pipe or failed
induced draft
blower.
Loose or
improperly
connected wiring.
■
■
■
■
■
■
■
■
■
■
■
■
■
■
■
Induced draft
blower and
circulator
blower runs
continuously.
No furnace
operation.
Integrated
control module
LED display
provides “E4”
error code.
E4
No furnace
operation.
Integrated
control module
LED display
provides “E5”
error code.
E5
■
Flame sensed
with no call for
heat.
■
■
■
■
Open fuse.
■
Short to ground in
flame sense circuit.
Lingering burner
flame.
Slow closing gas
control valve.
■
Short in low voltage
wiring.
■
■
■
Notes and Cautions
Inspect pressure
switch hose. Repair/
replace, if necessary,
Inspect flue and/or
inlet air piping for
blockage, proper
length, elbows and
termination.
Check drain system.
Correct as necessary.
Check induced draft
blower performance.
Correct as necessary.
Correct pressure
switch setpoint or
contact motion.
Tighten or correct
wiring connection.
■
Check filters and
ductwork for blockage.
Clean filters or remove
obstruction.
Check circulator
blower speed and
performance. Correct
speed or replace
blower if necessary.
Check burners for
proper alignment.
Check flue and air inlet
piping for blockage,
proper length, elbows
and termination.
Correct as necessary.
Check induced draft
blower for proper
performance. Replace,
if necessary.
Tighten or correct
wiring connection.
■
Correct short at flame
sensor or in flame
sensor wiring.
Check for lingering
flame.
Verify proper operation
of gas control valve
■
Turn off power prior to
repair.
Locate and correct
short in low voltage
wiring.
■
Turn off power prior to
repair.
Replace fuse with 3A
automotive fuse.
■
■
■
■
■
Turn off power prior to
repair.
Replace pressure
switch with correct
replacement part.
Replace induced draft
blower with correct
replacement part.
Turn off power prior to
repair.
See Specification
Sheet applicable to
your model for
allowable rise range
and proper circulator
speed.
See “Vent/Flue Pipe”
section for piping
details.
45
Symptoms of
Abnormal
Operation
■
■
■
■
■
■
■
■
■
Furnace not
operating.
Integrated
control module
LED display
provides “E6”
error code.
Diagnostic/
Staus LED
Code
Fault Description Possible Causes
E6
■
Flame sense
microamp signal
is low.
■
■
■
Furnace
operating on
low stage gas
with high stage
induced draft
blower
High stage
circulator
blower
(temperature, of
conditioned air,
lower than
typical).
Integrated
control module
LED display
provides “E7”
error code.
E7
Furnace fails to
operate on high
stage. Furnace
operates
normally on low
stage.
Integrated
control module
LED display
provides “E8”
error code.
E8
Furnace fails to
operate on high
stage. Furnace
operates
normally on low
stage.
Integrated
control module
LED display
provides “E9”
error code.
E9
■
Problem with
igniter circuit.
■
■
■
■
Flame sensor is
coated/oxidized.
Flame sensor
incorrectly
positioned in
burner flame.
Lazy burner flame
due to improper
gas pressure or
combustion air.
■
Improperly
connected igniter.
Shorted igniter.
Poor unit ground.
Igniter relay fault on
integrated control
module.
■
■
■
■
■
■
■
■
■
■
■
■
■
High-stage
pressure switch
circuit is closed
at start of
heating cycle.
Induced draft
blower is
operating.
Furnace is
operating on
low stage only.
■
High-stage
pressure switch
circuit is not
closed.
Induced draft
blower is
operating.
Furnace is
operating on
low stage only.
■
■
■
■
■
46
Corrective Actions
High-stage
pressure switch
contacts sticking.
Shorts in pressure
switch circuit
wiring.
■
Pressure switch
hose blocked,
pinched or
connected
improperly.
Blocked flue and/or
inlet air pipe,
blocked drain
system or weak
induced draft
blower.
Incorrect pressure
switch setpoint or
malfunctioning
switch contacts.
Loose or
improperly
connected wiring.
■
■
■
■
■
■
Notes and Cautions
Sand flame sensor if
coated/oxidized.
Inspect for proper
sensor alignment.
Check inlet air piping
for blockage, proper
length, elbows and
termination.
Compare current gas
pressure to rating plate
info. Adjust as needed.
■
Check and correct
wiring from integrated
control module to
igniter
Replace shorted
igniter.
Check and correct
furnace ground wiring
Check igniter output
from control. Replace,
if necessary.
■
Replace high-stage
pressure switch.
Repair short in wiring.
■
Inspect pressure
switch hose. Repair, if
necessary.
Inspect flue and/or
inlet air piping for
blockage, proper
length, elbows and
termination. Check
drain system. Correct
as necessary.
Check induced draft
blower performance.
Correct as necessary.
Correct pressure
switch setpoint or
contact motion.
Tighten or correct
wiring connection.
■
■
■
■
■
■
■
■
■
Turn off power prior to
repair.
Sand flame sensor
with emery cloth.
See “Vent/Flue Pipe”
section for piping
details.
See rating plate for
proper gas pressure.
Turn off power prior to
repair.
Replace igniter with
correct replacement
part.
Replace control with
correct replacement
part.
Turn off power prior to
repair.
Replace pressure
switch with correct
replacement part.
Turn off power prior to
repair.
Replace pressure
switch with correct
replacement part.
Replace induced draft
blower with correct
replacement part.
Symptoms of
Abnormal
Operation
■
■
■
■
Diagnostic/
Staus LED
Code
Fault Description Possible Causes
Furnace fails to
operate.
Integrated
control module
LED display
provides “EA”
error code.
EA
Furnace fails to
operate.
Integrated
control module
LED display
provides “d0”
error code.
d0
■
Polarity of 115volt AC is
reversed.
■
■
■
Data not yet on
network.
■
Corrective Actions
Polarity of 115-volt
AC power to
furnace or
integrated module
is reversed.
Poor furnace
ground.
■
Furnace does not
contain any shared
data.
■
■
■
Notes and Cautions
Review wiring diagram
to correct polarity.
Verify proper ground.
Correct if necessary.
Check and correct
wiring.
■
Turn off power prior to
repair.
Populate shared data
set using memory
card.
■
Turn off power prior to
repair.
Use memory card for
the specific model.
Insert memory card
before turning on
power. Memory card
may be removed after
data is loaded.
Turn off power before
removing memory
card.
Error code will be
cleared once data is
loaded.
■
■
■
■
■
■
Operation
different than
expected or no
operation.
Integrated
control module
LED display
provides “d4”
error code.
d4
■
Invalid memory
card data.
■
Shared data set on
memory card has
been rejected by
integrated control
module.
■
Verify shared data set
is correct for the
specific model.
Repopulate data using
correct memory card, if
required.
■
■
■
■
■
■
■
Furnace fails to
operate.
Integrated
control module
LED display
provides “b0”
error code.
b0
■
Circulator
blower motor is
not running
when it should
be running.
■
■
■
Loose wiring
connection at
circulator motor
power leads or
circulator motor
power leads
disconnected.
Open circuit in
inductor or loose
wiring connection
at inductor (³⁄₄ Hp
and 1 Hp models
only).
Failed circulator
blower motor.
■
■
■
Tighten or correct
wiring connection.
Verify continuous
circuit through
inductor. Replace if
open or short circuit.
Check circulator
blower motor. Replace
if necessary
■
■
■
Turn off power prior to
repair.
Use memory card for
the specific model.
Insert memory card
before turning on
power. Memory card
may be removed after
data is loaded.
Turn off power before
removing memory
card.
Error code will be
cleared once data is
loaded.
Turn off power prior to
repair.
Replace inductor with
correct replacement
part.
Replace circulator
motor with correct
replacement part.
47
Symptoms of
Abnormal
Operation
■
■
■
■
Diagnostic/
Staus LED
Code
Fault Description Possible Causes
Furnace fails to
operate.
Integrated
control module
LED display
provides “b1”
error code.
b1
Furnace fails to
operate.
Integrated
control module
LED display
provides “b2”
error code.
b2
■
Integrated
control module
has lost
communication
s with circulator
blower motor.
■
■
■
■
Circulator
blower motor
horse power in
shared data set
does not match
circulator
blower motor
horse power.
■
■
Corrective Actions
Loose wiring
connection at
circulator motor
control leads.
Failed circulator
blower motor.
Failed integrated
control module.
■
Incorrect circulator
blower motor in
furnace.
Incorrect shared
data set in
integrated control
module.
■
■
■
■
Notes and Cautions
Tighten or correct
wiring connection.
Check circulator
blower motor. Replace
if necessary.
Check integrated
control module.
Replace if necessary.
■
Verify circulator blower
motor horse power is
the same specified for
the specific furnace
model. Replace if
necessary.
Verify shared data set
is correct for the
specific model.
Repopulate data using
correct memory card, if
required.
■
■
■
■
■
■
■
■
■
■
■
■
■
48
Furnace
operates at
reduced
performance.
Airflow
delivered is less
than expected.
Integrated
control module
LED display
provides “b3”
error code.
b3
Furnace fails to
operate.
Integrated
control module
LED display
provides “b4”
error code.
b4
■
Circulator
blower motor is
operating in a
power,
temperature or
speed limiting
condition.
■
■
■
■
Blocked filters.
Restrictive
ductwork.
Undersized
ductwork.
High ambient
temperatures.
■
■
■
■
■
■
Circulator
blower motor
senses a loss of
rotor control.
Circulator
blower motor
senses high
current.
■
■
Abnormal motor
loading, sudden
change in speed or
torque, sudden
blockage of
furnace air inlet or
outlet.
High loading
conditions, blocked
filters, very
restrictive
ductwork,
blockage of
furnace air inlet or
outlet.
■
Turn off power prior to
repair.
Replace circulator
motor with correct
replacement part.
Replace integrated
control module with
correct replacement
part.
Turn off power prior to
repair.
Replace motor with
correct replacement
part.
Use memory card for
the specific model
Insert memory card
before turning on
power. Memory card
may be removed after
data is loaded.
Turn off power before
removing memory
card.
Error code will be
cleared once shared
data and motor horse
power match.
Check filters for
blockage. Clean filters
or remove obstruction.
Check ductwork for
blockage. Remove
obstruction. Verify all
registers are fully open.
Verify ductwork is
appropriately sized for
system. Resize/replace
ductwork if necessary.
See “Product
Description” and
“Location
Requirements and
Considerations” for
furnace installation
requirements.
■
Turn off power prior to
repair.
Check filters, filter
grills/registers, duct
system and furnace air
inlet/outlet for
blockages.
■
Turn off power prior to
repair.
Symptoms of
Abnormal
Operation
■
■
■
■
■
■
Diagnostic/
Staus LED
Code
Fault Description Possible Causes
Furnace fails to
operate.
Integrated
control module
LED display
provides “b5”
error code.
b5
Furnace fails to
operate.
Integrated
control module
LED display
provides “b6”
error code.
b6
Furnace fails to
operate.
Integrated
control module
LED display
provides “b7”
error code.
b7
■
■
Furnace
operates at
reduced
performance or
operates on low
stage when
high stage is
expected.
Integrated
control module
LED display
provides “b9”
error code.
■
■
■
■
■
■
■
■
Circulator
blower motor
fails to start 10
consecutive
times.
b9
■
Circulator
blower motor
shuts down for
over or under
voltage
condition.
Circulator
blower motor
shuts down due
to over
temperature
condition on
power module.
■
Circulator
blower motor
does not have
enough
information to
operate
properly.
Motor fails to
start 40
consecutive
times.
■
Airflow is lower
than demanded.
■
■
■
■
Corrective Actions
Obstruction in
circulator blower
housing.
Seized circulator
blower motor
bearings.
Failed circulator
blower motor.
■
High AC line
voltage to furnace.
Low AC line
voltage to furnace.
High ambient
temperatures.
■
Error with
integrated control
module.
Motor has a locked
rotor condition.
■
■
■
■
■
■
Blocked filters.
Restrictive
ductwork.
Undersized
ductwork.
■
■
■
Notes and Cautions
Check circulator
blower for
obstructions. Remove
and repair/replace
wheel/motor, if
necessary.
Check circulator
blower motor shaft
rotation and motor.
Replace motor if
necessary.
■
Check power to
furnace. Verify line
voltage to furnace is
within the range
specified on the
furnace rating plate.
See “Product
Description” and
“Location
Requirements and
Considerations” for
furnace installation
requirements.
■
Turn off power prior to
repair.
Check integrated
control module. Verify
control is populated
with correct shared
data set. See data
errors above for
details.
Check for locked rotor
condition (see error
code above for
details).
■
Turn off power prior to
repair.
Replace with correct
replacement part(s).
Use memory card for
the specific model.
Check filters for
blockage. Clean filters
or remove obstruction.
Check ductwork for
blockage. Remove
obstruction. Verify all
registers are fully open.
Verify ductwork is
appropriately sized for
system. Resize/replace
ductwork if necessary.
■
■
■
■
■
Turn off power prior to
repair.
Replace motor with
correct replacement
part.
Replace wheel with
correct replacement
part.
Turn off power prior to
repair.
49
WIRING DIAGRAM
WARNING
HIGH VOLTAGE!
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage, personal injury or death.
To 115 VAC/10/60 Hz Power Supply with
Overcurrent Protection Device
GND
Junction Box
Induced Draft Blower 2-Stage Pressure Switch Assembly
Equipment GND
24V Humidifier
Field GND
Hot
Surface
Igniter
Field Splice
OR
Low-Fire
Pressure
Switch
C
C
NO
Switch (Temp.)
W
Disconnect
Y
Igniter
R
PR
W
2
C
BR
1
PM
To 115 VAC/10/60 Hz Power Supply with
Overcurrent Protection Device
OR
3
HI
2-Stage
Gas
Control
Valve
Overcurrent
Prot. Device
WARNING:
Disconnect Power
Before Servicing. Wiring
N To Unit Must Be Properly
Polarized and Grounded.
NO
2-Circuit
2 1 Connector
Pressure Switch
L
BK
High-Fire
Pressure
Switch
GY
N
WARNING:
Disconnect Power
Before Servicing. Wiring
To Unit Must Be Properly
Polarized and Grounded.
GY
NO
GND
L
Flame
Sensor
C
Front Cover Pressure Switch
Disconnect
Low Voltage Field
PK
OR
BR
BU
BU
High Voltage (115V)
High Voltage Field
Chassis Ground
Manual Reset Rollout Limit Controls
(Single control on 45 kBtu)
Low Voltage (24V)
Door
Switch
Junction Box
Auto Reset Primary Limit Control
Inductor Coil
70 kBtu, 90 kBtu,
115 kBtu Models Only
OR
PR
Junction
Terminal
3
2
1
W
R
BK
G
BR
UNUSED
DEHUM
1
5
4
9
8
7
OR
12
11
10
PK
15
14
OR
Flame Sensor
LINE
R
GY
GY
OR
24
VA C
COOL
LINE
40 VA
Transformer
BK
W1
EAC
24V Humidifier
W
4
1
2
3
BK
Circulator Blower
5
4
3
2
1
BK
PK
To
Micro
Blower Compartment
Door Switch
(Open When Door Open)
Inductor Coil
70 kBtu, 90 kBtu, 115 kBtu Models Only
PS2 (12) NO
C
High-Fire
Pressure Switch
Manual Reset Rollout Limit Controls
HLI (1)
DEHUM
MVL (13)
C
MVH (14)
C
NO
Front Cover
Pressure Switch
MVC (8)
GND
TR (11)
To
R
GND
Low-Fire
Pressure Switch
C
GND (5)
W
Auto Reset
Primary Limit
Control
NO
W2
BK
BK
G
24 VAC
Manual Reset Auxiliary
Limit Controls
24V Humidifier
W
GY
BK
TH (4)
PSO (7)
O
BU
40 VA Transformer
PS1 (2)
G
NEUTRAL
Neutral
115 VAC
HLO (10)
Y2
R
ECM Motor
Harness
Y1
FS
HUM
5
5-Circuit Connector
3
4
W
W
Fuse 3A
To +VDC
Thermostat Connections
PR
2 4V
4-Circuit Motor
Connector
2
Neutral
OR
ADJUST
BU
Neutral
Humidifier
IGN
115
VA C
1
HUM
BR
DELAY
Neutral
FS
2
6
Y
Induced
Draft
Blower
Hot Surface Igniter
3
13
Neutral
IND LO
BR
HEAT
Electronic
Air Cleaner
IND HI
Integrated Control Module
Y
24 V
3A
1
DIP Switches
2-Stage Integrated
Control Module
4
2
R
BK
R
2
3
C
G
W1
W2
Y1
Y2
O
DEHUM
R
1
2ND STG DLY
T-STAT
HEAT OFF
DELAY
GY
Fuse
See NOTE 5.
Diagnostic
LEDs
PK
Manual Reset Auxiliary Limit Controls
24V Thermostat Connections
EAC
Integrated Control Module
PR
Y
W
Wiring is subject to change.
Always refer to the wiring
diagram on the unit for the
most up-to-date wiring.
Blower Compartment
Neutral
LINE
W
Symbol
GY
W
BK
R
BU
OR
Y
G
PK
A
V
BR
GND
GND
Burner Compartment
Color
Gray
White
Black
Red
Blue
Orange
Yellow
Green
Pink
Azure
Violet
Brown
Indoor Air
Circulator
Blower
Induced Draft Blower
PR
Internal To
Integrated Control
Plug Connection
HI
C
Gas Control
Valve
GND (4)
+ VDC (1)
Indoor Air
Circulator
Blower
RX (2)
To
Micro
PM
TX (3)
Integrated Control Module
Humidifier
Check codes for proper wiring and circuit protection before installation.
NOTES:
1. Set heat anticipator on room thermostat at 0.7 amps.
4.
2. Manufacturer’s specified replacement parts must be used
when servicing.
5.
3. If any of the original wire as supplied with the furnace must be
replaced, it must be replaced with wiring material having a
50
temperature rating of at least 105ºC. Use copper conductors
only.
Furnace must be permanently grounded and conform to NEC
and local codes.
To recall the last 6 faults, most recent to least recent, depress
switch for more than 2 seconds in standby (no thermostat
inputs).
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.
51
WPIO-368
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®Registered Trademark/TM Trademark of Whirlpool, U.S.A.,
Manufactured under license by Tradewinds Distributing Company, LLC, Jacksonville, Florida
10/09
Printed in U.S.A.