Lennox B050A3B, B075A4B, B075A3B, B100A5B, B125A5B Installation/servicing Instructions And Users Information Manual

AFFIX LABEL HERE

INSTALLATION / SERVICING INSTRUCTIONS

AND USER’S INFORMATION MANUAL

HORIZONTAL GAS-FIRED NON-CONDENSING FURNACE

Save these instructions for future reference.

WARNING

Improper installation, adjustment, alteration, service, or maintenance can cause injury or property damage.
Refer to this manual. For assistance or additional information, consult a qualified installer, service agency,
or the gas supplier.

WARNING

Do not store combustible materials, including gasoline
and other flammable vapors and liquids, near the
furnace, vent pipe, or warm air ducts. The homeowner
should be cautioned that the furnace area must not be
used as a broom closet or for any other storage
purposes. Such uses may result in actions that could
cause property damage, personal injury, or death.

WARNING

This furnace is not approved for installation in a mobile
home. Do not install this furnace in a mobile home.
Installation in a mobile home could result in actions that
could cause property damage, personal injury, or death.

TABLE OF CONTENTS

SECTION 1: INSTALLATION AND

SERVICING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . 1 - 28

Important Safety Information . . . . . . . . . . . . . . . . . . 2

Specification and Installation . . . . . . .. . . . . . . . . . . 3

Start-up and Operation . . . . . . . . . . . . . . . . . . . . . . 17

Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Sequence of Operation & Diagnostics . . . . . . . . . . . 23

Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

SECTION 2: USER’S INFORMATION MANUAL . . . . . . . . 29 - 36

Important Safety Information . . . . . . . . . . . . . . . . . 30

Operating Your Furnace . . . . . . . . . . . . .. . . . . . . . .30

Maintenance of Your Furnace . . . . .. . . . . . . . . . . . .32

Repair Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Owner Record . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Manufactured By

Allied Air Enterprises Inc.

A Lennox International Inc. Company

215 Metropolitan Drive

West Columbia, SC 29170

*P506307-01*

(P) 506307-01

IMPORTANT

The installation of the furnace, wiring, warm air ducts, venting, etc. must conform to the requirements of the National Fire
Protection Association; the National Fuel Gas Code, ANSI Z223.1/NFPA No. 54 (latest edition) and the National Electrical
Code, ANSI/NFPA No. 70 (latest edition) in the United States; CSA B149.1 (latest edition) Natural Gas and Propane
Installation Codes and the Canadian Electrical Code Part 1, CSA 22.1 (latest edition) in Canada; and any state or
provincial laws, local ordinances (including plumbing or wastewater codes), or local gas utility requirements. Local
authorities having jurisdiction should be consulted before installation is made. Such applicable regulations or requirements
take precedence over the general instructions in this manual.

506307-01 Page 1 of 36Issue 1207

IMPORTANT SAFETY INFORMATION

The following is a list of safety rules and precautions that
must be followed when installing this furnace.

1. Use only with the type of gas approved for this
furnace. Refer to the furnace rating plate.

2. Install this furnace only in a location and position as
specified in the Location section on page 7 of these
instructions.

3. Provide adequate combustion and ventilation air to
the furnace space as specified in the Air for
Combustion and Ventilation section beginning on
page 8 of these instructions.

4. Combustion products must be discharged outdoors.
Connect this furnace to an approved vent system
only, as specified in Venting beginning on page 10
of these instructions.

5. Never test for gas leaks with an open flame. Use a
commercially available soap solution made
specifically for the detection of leaks to check all
connections, as specified in Gas Connection
Section beginning on page 14 of these instructions.

6. Always install furnace to operate within the furnace’s
intended temperature-rise range with a duct system

which has an external static pressure within the allowable
range, as specified in Temperature Rise on page 3 of
these instructions. See furnace rating plate.

7. When a furnace is installed so that the supply ducts
carry air circulated by the furnace to areas outside
the space containing the furnace, the return air shall
also be handled by duct(s) sealed to the furnace
casing and terminating outside the space containing
the furnace. See Ducting beginning on page 9 of
these instructions.

8. A gas-fired furnace for installation in a residential
garage must be installed as specified in the Location
section on page 7 of these instructions.

9. The furnace is permitted to be used for temporary
heating of buildings or structures under construction
as specified in the Location section on page 7 of
these instructions.

In the State of Massachusetts:

This product must be installed by a licensed Plumber
or Gas Fitter. When flexible connectors are used,
the maximum length shall not exceed 36". When
lever-type gas shutoffs are used, they shall be T­handle type.

Page 2 of 36 506307-01Issue 1207

506307-01 Page 3 of 36Issue 1207

FURNACE BLOWER SPECIFICATIONS AND AIR FLOW DATA

NOTES:

1. Air flow values in cubic feet per minute (CFM), rounded to nearest five (5) CFM.

2. Data taken without filters in place or A/C evaporator in place.

WARNING

When operating the furnace in the heating mode, the static pressure and the temperature rise (supply air temperature
minus return air temperature) must be within those limits specified on the rating label. Failure to follow this warning could
lead to severe furnace damage.

WARNING

Turn OFF all gas and electrical power to furnace before performing any maintenance or service on unit. (Unless specific
test requires gas and electrical supplies.) Failure to take this precaution may result in personal injury due to electrical shock
or uncontrolled gas leakage.

Page 4 of 36 506307-01Issue 1207

FURNACE WIRING SPECIFICATIONS

506307-01 Page 5 of 36Issue 1207

WARNING

The furnace cabinet must have an uninterrupted or unbroken electrical ground to minimize personal injury if an electrical
fault should occur. The unit must also be electrically grounded in accordance with local codes, or in the absence of local
codes, with the latest edition of the (U.S.)
Canadian Electrical Code, if an external electrical source is utilized. DO NOT use gas piping as an electrical ground.

National Electrical Code ANSI/NFPA No. 70 or CSA Standard C22.1: Part 1

INTRODUCTION

This furnace is design certified by CSA International as a Category I furnace using air from inside the structure for
combustion. The combustion system is fan-assisted which means it is equipped with an integral mechanical means to draw
products of combustion through the heat exchanger.

It is shipped as a packaged unit, complete with burners and controls, and requires a line voltage (115V) connection to the
junction box, a thermostat hook-up as per the wiring diagram and a gas line connection, ducting and flue piping. This furnace

can be installed in either horizontal right or horizontal left airflow positions. The design of this furnace is NOT CSA
Certified for installation in recreation vehicles, in manufactured (mobil) homes, outdoors or as a construction heater.

This furnace has been designed to interface with split system cooling equipment (approved by a nationally recognized
testing laboratory) so as to provide “year round air conditioning”. The blower has been sized for both heating and cooling and
the furnace controls include a cooling fan relay.

The furnace installation must conform with local building codes or in the absence of local codes, with the latest edition of
the (U.S.) National Fuel Gas Code ANSI Z223.1 (NFPA-54) or Canadian Natural Gas and Propane Installation Codes CSA
B149.1.

For complete information on installation standards consult the (U.S.) National Fuel Gas Code, obtainable from the National
Fire Protection Association, Inc., Batterymarch Park, Quincy, MA 02269 or the American Gas Association, 1515 Wilson
Boulevard, Arlington, VA 22209 or the Canadian installation codes obtainable from Canadian Standards Association, 178
Rexdale Boulevard, Etobicoke, Ontario, Canada M9W 1R3.

This furnace is designed from minimum continuous return-air temperature of 60°F dB or intermittent operation down to
55°F dB such as when used with a night setback thermostat. Return-air must not exceed a maximum continuous temperature
of 85°F dB.

The furnace may be used for heating of buildings or structures under construction, if the following conditions are met:

• The vent system must be permanently installed per these instructions.

• A room thermostat must control the furnace. The use of fixed jumpers that will provide continuous heating is not allowed.

• The return air duct must be provided and sealed to the furnace.

• Return air temperature range between 60°F and 80°F must be maintained.

• Air filters must be installed in the system and must be maintained during construction.

• Air filters must be replaced upon construction completion.

• The input rate and temperature rise must be set per the furnace rating plate.

• One hundred percent (100%) outdoor air must be provided for combustion air requirements during construction. Temporary

ducting may supply outdoor air to the furnace. Do not connect combustion air duct directly to the furnace. Size the

temporary duct following these instructions in the section “Air for Combustion & Ventilation” for air in a confinced space

with air from outside.

• The furnace heat exchanger, components, duct system, air filters and evaporator coils must be thoroughly cleaned

following final construction clean-up.

• All furnace operating conditions (including ignition, input rate, temperature rise and venting) must be verified according to

these installation instructions.

These instructions are written for individual residential installation only. For multi-unit installation, please contact
manufacturer for recommendations.

Page 6 of 36 506307-01Issue 1207

LOCATION / PLACEMENT

Site Selection: This furnace may be located in an attic, closet, basement, crawl space, alcove or suspended from the ceiling

of a utility room or basement. Select a location that will meet all requirements for safety, clearances, ventilation
and combustion air, ductwork design, gas piping, electrical wiring and venting.

Clearances: The following minimum clearances, or greater, must be provided between the furnace and adjacent

construction.

If the furnace is to be installed in a crawl space, consult

WARNING

Failure to comply with all of the clearances will create a
fire hazard.

The furnace should also be located as near to the center
of the air distribution system as possible, and should be
installed level.

This furnace may be installed on mon-combustible
flooring or on wood flooring, however, it must not be installed
directly on carpeting, tile or any other combustible material.

Line contact is only permissible bewteen lines formed
by the intersection of the furnace top, the front and back
sides, and building joists, studs or framing (See Figure 1).

HORIZONTAL LINE CONTACT

local codes. (Use of a concrete pad 1” to 2” thick is
recommended.)

If the furnace is to be suspended from the ceiling, it will
be necessary to use steel pipe straps around each end of
the furnace. These straps should be attached to the furnace
with sheet metal screws and to the rafters with bolts. The
furnace may also be suspended by using an angle iron frame
bolted to the rafters. (See Table on page 3 for size and
weight of furnace.) Care must be taken to allow for service
access.

If a furnace is to be installed in a residential garage, it
must be installed so the burners and the ignition source are
located not less than 18” above the floor and the furnace
must be located or protected to avoid physical damage by
vehicles.

Figure 1

Furnace must not lean back. It must be level or tilt

up to 2° to the front. (See Figure 1.)

A clearance of at lease 30” should be provided at the
front of the unit for servicing. For attic installations, the
passageway and servicing area adjacent to the furnace
should be floored.

506307-01 Page 7 of 36Issue 1207

WARNING

Do not place combustible material on the furnace jacket.
Failure to comply with this warning will create a fire hazard.

WARNING

This furnace is not watertight and is not designed for
outdoor installation. This furnace shall be installed in such
a manner as to protect the electrical components from
water. Outdoor installation would lead to a hazrdous
electrical condition and to premature furnace failure.

AIR FOR COMBUSTION AND VENTILATION

Contaminated Combustion Air and Fuels:

Allowing exposure to substances containing chlorine or

fluoride could harm the furnace and void warranty.
Substances to avoid include, but are not limited to:

• Permanent wave solutions

• Chlorinated waxes and cleaners

• Chlorine based swimming pool chemicals

• Water softening chemicals

• De-icing salts or chemicals

• Carbon tetrachloride

• Halogen type refrigerants

• Cleaning solvents (such as perchloroethylene)

• Printing inks, paint removers, varnishes, etc.

• Hydrochloric acid

• Cements and glues

• Antistatic fabiric softeners for clothes dryers

• Masonry acid washing materials

• Unrefined Gases

WARNING

Contaminated combustion air may cause premature failure
of the heat exchanger that may lead to a hazardous
condition and/or bodily harm, or loss of life.

For purposes of this instruction the following definitions

apply:

Confined Space: A space whose volume is less than

50 cubic feet per 1000 Btu/hr of the
aggregate input rating of all
appliances installed in that space.

Unconfined Space: A space whose volume is not less

than 50 cubic feet per 1000 Btu/hr
of the aggregate input rating of all
appliances installed in that space.
Rooms communicating directly
with the space in which the
applicances are installed, through
openings not furnished with doors,
are considered a part of the
unconfined space.

If the installation area meets the definition of “Unconfined
Space” and does not have additional air requirements as
described, the furnace may be installed without making
special provisions for combustion and ventilation air.

CAUTION

Whenever this furnace is installed in an area along with
one or more gas appliances, the total Btu/hr input of all
appliances must be included when determining the free
area requirements for combustion and ventilation air
openings.

Adequate Ventilation and Combustion Air:

This section is provided to give guidelines for the
introduction of air for ventilation and combustion air. The
total quantity of air provided to the installation area must
equal the requirements of all gas appliances in the area.

Adequate facilities for providing air for combustion and
ventilation must be provided in accordance with the latest
edition of the National Fuel Gas Code ANSI Z223.1/NFPA54
or CSA B149.1 Natural Gas and Propane Installation Codes,
or applicable provisions of the local building codes.

The furnace shall be installed in a location in which the
facilities for ventilation permits satisfactory combustion of
gas, proper venting and maintenance of ambient
temperature at safe limits under normal conditions of use.
The furnace shall be located so as not to interfere with proper
circulation of air.

In addition to air needed for combustion, ventilation in
the form of process air must be provided as required for:
cooling of eqipment or material, controlling dew point,
heating, drying, oxidation or dilution, safety exhaust and odor
control. Air must be supplied for ventilation, including all air
required for comfort and proper working conditions for
personnel.

WARNING

Do not block the combustion or ventilation air openings in
the furnace. Any blockage will result in improper
combustion and may result in a fire hazard or unsafe
condition.

If ventilation and/or combustion air must be supplied to
the “Confined Space” from outside the building structure,
two permanent openings to the outdoors must be created.
Each opening must have a free area of not less than one
square inch per 4000 Btu per hour of total input of all
applicances within the “Confined Space”, (See Figures 2
and 3). Neither openings can be blocked at any time.

Page 8 of 36 506307-01Issue 1207

CONFINED SPACE / OUTDOOR AIR FROM ATTIC

FURNACE

VENTILATION LOUVERS
1 SQ. IN. / 4000 BTUH

OF TOTAL INPUT

F0000309

VENTILATION LOUVERS
1 SQ. IN. / 4000 BTUH
OF TOTAL INPUT

F0000310

CONFINED SPACE / OUTDOOR AIR FROM

ATTIC & CRAWL SPACE

For an attic installation it is important to keep insulation
12” or more away from any furnace openings. Some types
of insulating materials may be combustible.

The proper sizing of warm air ducts is necessary to insure satisfactory heating operation. Ductwork should be in accordance
with the latest editions of (U.S.)
Systems) or Canadian equivalent.

Ductwork Recommendation:

The supply ductwork should be attached to the flanged
opening provided at the discharge end of the furnace. See
page 3 Furnace Specifications for the dimensions of this
opening.

Undersized return air vents will adversely affect the
airflow capability of the furnace and could cause
overheating of the heat exchanger. The following

recommendations should be followed when installing the
ductwork:

1. Install locking-type dampers in all branches of the

individual ducts to balance out the system. Dampers
should be adjusted to impose the proper static at the outlet
of the furnace.

2. Noncombustible flexible duct connectors are

recommended to connect both the supply and return ducts
to the furnace.

3. In cases where the return air grille is located close to the

blower inlet, there should be at least one 90° air turn
between blower and return grille. Further reduction in
sound can be accomplished by installing acoustical air
turning vanes and/or lining the inside of the duct with
acoustical material.

Figure 2

CAUTION

NFPA-90A (Air Conditioning Systems) and NFPA-90B (Warm Air Heating and Air Conditioning

Figure 3

WARNING

Furnaces installed with combustion air drawn from a
heated space which includes exhaust fans, fireplaces,
or other devices that may produce a negative pressure
should be considered confined space installations.

DUCTING

4. It is recommended that the supply duct be provided with
a removable access panel. This opening shall be
accessible when the furnace is installed and shall be such
a size that the heat exchanger can be viewed for possible
openings using light assistance or a probe can be inserted
for sampling the air stream. The access panel shall be
designed so as to prevent leaks when locked in position.
If an air conditioning coil is installed, the access panel to
the coil can be used for this purpose.

WARNING

When supply ducts carry air circulated by the furnace to
areas outside the spaces containing the furnace, the
return air shall also be handled by a duct sealed to the
furnace casing and terminating outside the space
containing the furance. Incorrect ductwork termination
and sealing will create a hazardous condition that could
lead to bodily harm.

506307-01 Page 9 of 36Issue 1207

CAUTION

BTU
INPUT

FILTER
SIZE

50,000

75,000

100,000

125,000

13 X 23

13 X 23

16 1/2 X 26

20 X 23

Air openings, intake and outlet pipes, return air grilles and
warm air registers must not be obstructed.

Filters:

Air filters must be used in every installation.

Minimum filter size and suggested filter material are
shown in Table 2. If different type filter is used, it must be an
equivalent high airflow capacity.

Filter Size Selection

Table 2

If the washable permanent filters are used with this unit they
should be cleaned periodically to prevent nuisance tripping
of the high limit switch and failure to provide adequate filter
media can cause equipment malfunction, uneven room
temperature and excessive fuel usage.

When installing the furnace with cooling equipment for
year round operation, the following recommendations must
be followed for series or parallel air flow:

1. In series flow applications, the coil is mounted after the

furnace in an enclosure in the supply air stream. The
furnace blower is used for both heating and cooling airflow.

2. In parallel flow installation, dampers must be provided to

direct air over the furnace heat exchanger when heat is
desired and over the cooling when cooling is desired.

IMPORTANT: The dampers should be adequate to
prevent cooled air from entering the furance, and if manually
operated, must be equipped with means to prevent operation
of either the cooling unit or furnace unless the damper is in
the full cool or full heat position.

WARNING

The coil MUST be installed on the air discharge side of
the furnace. Under no circumstances should the air flow
be such that cooled, conditioned air can pass over the
furnace heat exchanger. This will cause condensation
in the heat exchanger and possible failure of the heat
exchanger that could lead to a fire hazard and/or
hazardous conditions that may lead to bodily harm. Heat
exchanger failure due to improper installation will not be
covered by warranty.

VENTING

Venting for the furnace must be to the outside and in
accordance with local codes or requirements of the local
utility. In the absence of local codes, venting must conform
to the applicable sections of the latest edition of the (U.S.)
National Fuel Gas Code ANSI Z223.1/NFPA 54. and/or CSA
B149.1 Natural Gas and Propane Installation Codes, and
the vent manufacturers instructions.

This furnace is CSA International apporved as a
Category I forced air appliance and can not be vented into
a vent system with any Category II, III or IV appliance. It
must be vented vertically, or nearly vertically, unless installed
with a listed mechancial venter in accordance with horizontal
venting instructions. It must not be connected to any portion
of a mechanical draft system operating under positive
pressure.

The vent system must be securely fastened to the
furnace flue collar with two (2) field supplied, corrosion
resitant, sheet metal screws located at least 120 degrees
apart and midway up the collar (see Figure 4).

Page 10 of 36 506307-01Issue 1207

VENT SYSTEM CONNECTION

Figure 4

Pre-Installation Vent System Inspection:

Before this furnace is installed, it is highly recommended

that any existing vent system be completely inspected.

For a chimney or “B” vent, this should include the

following:

1. Inspection for any deterioration in the chimney or “B” vent.
If deterioration is discovered, the chimney must be
repaired or the “B” vent must be replaced.

2. Inspection to ascertain that the vent system is clear and
free of obstructions. Any blockage must be cleared before
installing this furnace.

3. Cleaning the chimney or “B” vent if previously used for
venting a solid fuel burning appliance or fireplace.

4. Confirming that all unused chimney or “B” vent connections
are properly sealed.

5. Verification that the chimney is properly lined and sized
per the applicable codes.

Masonry Chimney:

This furnace can be common vented into an existing

tile lined masonry chimney provided:

1. The chimney is currently serving at least one drafthood
equipped appliance.

2. The vent connectors and chimney are sized in accordance
with the applicable sections of the (U.S.) National Fuel
Gas Code ANSI Z223.1/NFPA54, and/or CSA B149.1
Natural Gas and Propane Installation Codes.

This furnace must

NOT be vented ALONE into an
existing masonry chimney (either title lined or unlined) unless
the chimney is also lined with either a type “B” vent system
or a listed single wall, metal lining system. Both of these
systems must be sized in accordance with the applicable
sections of the (U.S.) National Fuel Gas Code ANSI Z223.1/
NFPA 54, and/or CSA B149.1 Natural Gas and Propane
Installation Codes.

Before venting this furnace into a chimney, check the
chimney for deterioration and repair if necessary. This
furnace must not be vented into a chimney serving a separate
appliance designed to burn solid fuel. Type II “B” vent
connectors must be used on all installations and it must be
sized per the applicable sections of the (U.S.) National Fuel
Gas Code ANSI Z223.1/NFPA 54, and/or CSA B149.1
Natural Gas and Propane Installation Codes.

Horizontal Venting:

This furnace is design certified by CSA International for
horizontal venting through an outside wall by use of one of
the following auxiliary draft inducer kits:

AUXILIARY DRAFT INDUCERS

Table 3

See Figure 5 on page 12 for information on where the
sidewall vent terminal can and cannot terminate.

For Massachusetts Installations: The installation must
comply with Massachusetts 248 CMR 5.08 Modifications to
sections of NFPA-54, Chapter 10. (See pages 26 and 27)

General Venting Requirements:

This furnace may be common vented only with other
Category I appliances. Common venting is allowed as
permitted by national and/or local codes. Refer to the
applicable sections of the (U.S.) National Fuel Gas Code
ANSI Z223.1/NFPA 54, and/or CSA B149.1 Natural Gas and
Propane Installation Codes for proper sizing and set up.

The vent must be terminated with a listed vent cap or
roof assembly. This venting must be installed in accordance
with the vent manufacturer’s instructions and be in
accordance with all local codes and/or national codes.

The following requirements are provided for a proper
venting system:

1. Be sure that the chimney flue is clear of any dirt or debris.

2. Be sure that the chimney is not servicing an open fireplace.

Type “B” Vent:

The furnace is also approved for use with a “B” vent
that terminates through the roof. Refer to the applicable
sections of the (U.S.) National Fuel Gas Code ANSI Z223.1/
NFPA 54, and/or CSA B149.1 Natural Gas and Propane
Installation Codes for proper sizing and set-up of this furnace
with “B” vent for a dedicated vent system or a common
vented system.

506307-01 Page 11 of 36Issue 1207

Sidewall Vent Terminal Clearances (Non-Direct Vented Furnaces)

A** Minimum 12” (30 cm) above grade or
12” (30 cm) above average snow accumulation

V

X

Area Where Terminal Is
Not Permitted

Vent Terminal

Air Supply Inlet

1

In accordance with the current

Propane Installation Code

2

In accordance with the current ANSI Z223.1/NFPA 54, National
Fuel Gas Code

†

A vent shall not terminate directly above a sidewalk or paved

CSA B149.1, Natural Gas and

driveway that is located between two single family dwellings and
serves both dwellings.

Figure 5

Page 12 of 36 506307-01Issue 1207

‡

Permitted only if veranda, porch, deck, or balcony is fully open on a
minimum of two sides beneath the floor.

* For clearances not specified in

ANSI Z223.1/NFPA 54 or CSA

B149.1, the following statement shall be included:

“Clearance in accordance with local installation codes and the
requirements of the gas supplier and the manufacturer’s installation
instructions.”

3. Never reduce the pipe size below the outlet size of the

furnace without checking the applicable sections of the
(U.S.)
and/or CSA B149.1 Natural Gas and Propane Installa­tion Codes.

4. All pipe should be supported using the proper clamps

and/or straps. These supports should be at least every
four (4’) feet.

5. All horizontal runs of pipe should have at least a 1/4” (in.)

per foot of upward slope from the furnace to the vent
terminal.

6. All runs of pipe should be as short as possible with as few

turns as possible.

7. Seams should be tightly joined and checked for leaks.

8. The flue pipe must not extend into the chimney but be

flush with the inside wall.

National Fuel Gas Code ANSI Z223.1/NFPA54,

9. The chimney or vent pipe must extend at least three (3’)
feet above the highest point where it passes through a roof
of a building and at least two (2’) feet higher than any portion
of a building within a horizontal distance of ten (10’) feet. It
shall also extend at least five (5’) feet above highest
connected equipment flue collar.

Checking For Vent Oversizing:

If this furnace is replacing a furnace that is attached to a
venting system serving other appliances, the venting system
is likely to be too large to properly vent all of the attached
appliances. An improperly sized venting system can lead to
condensation, leakage, or spillage.

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each appliance connected to the venting system being placed into
operation could result in carbon monoxide poisoning or death.

The following steps shall be followed for each appliance connected to the venting system being placed into
operation, while all other appliances connected to the common venting system are not in operation:

1. Seal any unused openings in the venting system.

2. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 or the CSA B149.1, Natural Gas and Propane Installation Codes and these instructions.
Determine that there is no blockage or restriction, leakage, corrosion, or other deficiencies which could cause an
unsafe condition.

3. As far as practical, close all building doors and windows and all doors between the space in which the appliance(s)
connected to the venting system are located and other spaces of the building.

4. Close fireplace dampers.

5. Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans, such
as range hoods and bathroom exhausts, so they are operating at maximum speed. Do not operate a summer
exhaust fan.

6. Follow the lighting instructions. Place the applicance being inspected in operation. Adjust the thermostat so
appliance is operating continuously.

7. Test for spillage from draft hood equipped appliances at the draft hood relief opening after 5 minutes of main
burner operation. Use the flame of a match or candle.

8. If improper venting is observed during any of the above tests, the venting system must be corrected in accordance
with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or the CSA B149.1, Natural Gas and Propane
Installation Codes.

9. After it has been determined that each appliance connected to the venting system properly vents when tested as
outlined above, return doors, windows, exhaust fans, fireplace dampers, and any other gas-fired burning appliance
to their previous conditions of use.

506307-01 Page 13 of 36Issue 1207

ELECTRICAL CONNECTIONS

When installed, the furnace must be electrically grounded
in accordance with local codes or, in the absence of local
codes, with the (U.S.)
70 or CSA Standard C22.1; Part 1 Canadian Electrical Code.
For proper installation refer to furnace rating label for
electrical ratings and for the field wiring of this unit refer to
furnace wiring specifications on page 5 or alternately from
the wiring diagram on page 25. In all instances, other than
wiring for the thermostat, the wiring to be done and any
replacement of wire shall conform with the temperature
limitation for Type T wire [63°F rise (35°C)].

The electrical connections and the thermostat
connections are made through the openings on the side of
the control box.

The control system depends on the correct polarity of
the power supply. Connect “Hot” (H) wire and “Ground” (G)
wire as shown in furnace wiring specification on wiring
diagram. Use reference Table on page 3 (Furnace
Specifications), for over current protection, max unit amp
rating and wire size. Use copper wire only for 115V-supply
service to unit. When replacing any original internal wiring,
use only 105°C, 16 AWG copper wire.

National Electrical Codes, ANSI/NFPA

GAS CONNECTIONS

Instructions for wiring the thermostat are packed in the
thermostat (field supplied) box. Make the thermostat
connections as shown in furnace wiring specifications to the
wire pigtails on the 24-volt terminal board located in the
control box.

When installing optional accessories to this appliance,
follow the manufacturer’s installation instructions included
with the accessory.

WARNING

The unit cabinet must have an uninterrupted or unbroken
electrical ground to minimize personal injury if an
electrical fault should occur. This may consist of electrical
wire or approved conduit when installed in accordance
with existing electrical codes. Do not use gas piping as
an electrical ground. Failure to follow this warning can
result in an electrical shock, fire, bodily harm, or loss of
life.

Gas piping shall be of such size and so installed as to
provide a supply of gas sufficient to meet maximum demands
without undue loss of pressure between the gas meter and
the furnace. It is recommended that the gas line to the
furnace shall be a separate line direct from the meter, unless
the existing gas line is of ample capacity. Refer to gas pipe
capacity table in the (U.S.)
Z223.1/NFPA54, and/or CSA B149.1 Natural Gas and
Propane Installation Codes.

If local codes allow the use of a flexible gas appliance
connector, always use a new listed connector. Do not use a
connector which has previously serviced another gas
appliance.

Use a joint compound (pipe dope) that is resistant to
the action of liquefied petroleum gases or any other chemical
constituents of the gases to be conducted through the piping.

For proper furnace operation the maximum gas
supply pressure is 14” w.c. and the minimum gas supply
pressure is 4.5” w.c. - Natural (11” w.c. - LP) as shown
on rating label.

Before any system of gas piping is finally put into service,
it should be carefully tested to determine if it is gas tight.
Check all piping for leaks using soapy water and a brush.
The piping must stand a pressure of six (6) inches of mercury
(3 PSIG) for a period of ten (10) minutes or as required by
local authority.

National Fuel Gas Code ANSI

WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.

Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.

WARNING

The furnace and its individual shutoff valve must be
disconnected from the supply piping system during any
pressure testing of that system at test pressures in
excess of 1/2 PSIG (3.5kPa or 14” w.c.).

The furnace must be isolated from the gas supply piping
system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping
system at pressures equal to or less than 1/2 PSIG
(3.5kPa or 14” w.c.). Failure to follow the above
procedures could lead to a hazardous condition and
bodily harm.

Page 14 of 36 506307-01Issue 1207

Figure 6

GAS SUPPLY

FIELD SUPPLIED MAIN

MANUAL SHUT-OFF
VALVE

DRIP LEG

F0000316

GAS CONTROL PIPING

CAUTION

Many soaps used for leak testing are corrosive to certain
metals. Piping must be rinsed thoroughly with clean water
after leak check has been completed.

WARNING

Never use an open flame when testing for gas leaks!
Use of an open flame could lead to a fire or explosion.

TYPICAL GAS SERVICE CONNECTION

Figure 7A

TYPICAL GAS SERVICE CONNECTION

FIELD SUPPLIED MAIN

MANUAL SHUT-OFF

VALVE

GAS SUPPLY

DRIP LEG

F0000317

Figure 7B

Field Reversal:

WARNING

Before proceeding with field reversal, insure that all
electrical power is turned OFF and that all gas piping is
shut OFF and disconnected from the furnace. Failure to
do so could result in an extremely hazardous condition
and bodily harm.

FIELD REVERSED

BLOWER ACCESS

AIR FLOW

F0000312

Figure 8A

STANDARD

This furnace is manufactured for use with natural gas
and must be converted using the proper LP concersion kit
for use with LP (Propane) gas. For LP (Propane) gas, a
tank requlator is required to reduce supply pressure to 12”­13” w.c. For manifold pressure see Table 5.

A main manual shut off valve must be used in the gas
piping. The shut off type and location must follow local codes
and should always be in an accessible but protected location.
In the absence of local codes the recommended methods
for installing the gas piping to the furnace are shown in
Figures 6 and 7.

The gas valve contains two threaded ports for a 1/8”
NPT tap in order to test incoming gas pressure and outgoing
manifold pressure (See Figure 9).

506307-01 Page 15 of 36Issue 1207

BLOWER ACCESS

AIR FLOW

F0000311

Figure 8B

This furnace may be field reversed allowing for a left to
right airflow instead of the factory positioned right to left air
flow (See Figures 8A and B). Field reversal is accomplished
by inverting the furnace so that the “top” panel is down.

THEORY OF OPERATION

Here’s How Your System Works:

Call For Heat

The thermostat calls for heat by energizing the “W”
terminal. The control checks to see the limit switch is closed
and pressure switch is open. If the limit switch is open, the
control responds per the Open Limit section following. If
the pressure switch is closed, the control will flash “3” on
the LED and wait indefinitely for the pressure switch to open.
If the pressure switch is open, the control proceeds to pre­purge.

Pre-Purge

The control energizes the induced draft motor and waits
for the pressure switch to close. The control flashes “3” on
the LED while the pressure switch is open. If the pressure
switch does not close within 60 seconds of the inducer
energizing, the control will de-energize the inducer for 300
seconds, and then re-energized the inducer. This cycle shall
continue as long as a call for heat exists until the pressure
switch is proven.

When the pressure switch is proven closed, the control
begins the pre-purge time. If flame is present any time while
in pre-purge, the control will flash “5” on the LED and go into
soft lockout. The control runs the inducer for a 15 second
pre-purge time, then proceeds to the ignition trial period.

Ignition Trial Period

The control energizes the spark and main gas valve.
The inducer remains energized. If flame has not been
sensed within the 7 second ignition trial, the control de­energizes the gas and spark outputs and proceeds with
ignition retires. If flame is not established after three (3)
trials for ignition, the control will flash “2” on the LED and
goes into lockout.

Blower On Delay

The control waits for 30 seconds from the time the gas
valve opened and then energizes the indoor blower heat
speed. The gas valve and inducer remain energized. The
control proceeds to steady heat mode.

Steady Heat

Control inputs are continuously monitored to ensure limit
and pressure switches are closed, flame is established, and
the thermostat call for heat remains. When the thermostat
call for heat is removed, the control de-energizes the gas
valve and begins post-purge and blower off delay time.

When the switch re-closes, the control runs the induced
draft motor through post-purge and runs the indoor blower
through the selected fan off delay. If the call for heat is still
present when the limit switch closes, the control will begin
an ignition sequence while the blower off delay continues.
NOTE: An open limit switch breaks the power (“R”) to the
thermostat. Cycling on the limit is an abnormal condition
and a corrective action must be taken. Failure to correct
this condition could damage the heat exchangers and void
the warranty.

Post Purge

The inducer output remains on for a 15 second post­purge period after the thermostat is satisfied.

Blower Off Delay

The indoor blower motor is de-energized after a 90
second blower off delay. Blower timing begins when the
thermostat is satisfied. If the thermostat calls for heat while
in the blower off delay, the control immediately restarts the
ignition sequence while the blower off delay continues.

WARNING

Should overheating occur, or the gas supply fail to shut
OFF, turn OFF the manual gas valve to the appliance
BEFORE turning OFF the electrical supply. A failure to
adhere to this warning can result in a fire or explosion
and bodily harm.

For cooling operation, when the inside temperature
exceeds the thermostat setting, the thermostat will turn ON
the cooling system.

When the thermostat calls for cooling, power from the
transformer energizes the fan control board (for blower
operation) and the outdoor condensing unit (for air
conditioning).

The fan control board will automatically turn on the
blower and condensing unit. The air moving over the indoor
coil by the blower is cooled (and dehumidified) and passes
through the ducts to the room registers.

When the thermostat is satisfied, the fan control board
is de-energized and the condensing unit is shut-off. The
blower will continue to operate for an additional 30 seconds
for added cooling efficiency.

Open Limit

Any time the limit switch is open, the control de-energizes
the gas valve and runs the indoor blower motor on heat
speed, and runs the induced draft motor. While the limit
switch is open, the control flashes “4” on the LED. Check
for a restriction in the duct system (i.e. dirty filters, blocked

ductwork, closed registers . . . . . . ).

Page 16 of 36 506307-01Issue 1207

STARTUP AND OPERATIONAL CHECKOUT

WARNING

Do not use this furnace as a construction heater. Use of
this furnace as a construction heater exposes the furnace
to abnormal conditions, contaminated combustion air and
the lack of air filters. Failure to follow this warning can
lead to premature furnace failure and/or vent failure which
could result in a fire hazard and/or bodily harm.

The automatic gas valve controls the flow of gas to the
main burners. The ignition system control switch built into
the automatic valve body has 2 positions: “OFF” and “ON”
(Figure 9). To shut off gas manually: Rotate switch from
“ON” to “OFF” position. When in “OFF” position, the main
burners are extinguished.

This furnace is equipped with an automatic spark ignition
control and does not require the manual lighting for furnace
operation.

GAS CONTROL DIAGRAM

TYPICAL FLAME APPEARANCE

(Main Burners)

7. Recheck for leaks in the manual shut off valve, gas control
valve and gas connections using a soap solution.

WARNING

Never use an open flame when testing for gas leaks!
Use of an open flame could lead to a fire or explosion.

CAUTION

Figure 9

WARNING

Do not attempt to manually light the burners. Failure to
follow this warning can lead to electrical shock that could
result in bodily harm.

After the ductwork connections have been made, gas
piping and electrical wiring completed and the furnace has
been properly vented, the unit should be started and adjusted
for proper operation. Check off the following steps as they
are completed.

1. Be sure all electrical power is OFF.

2. Check all wiring using proper wiring diagram on inside

of the control box cover.

3. Turn ON the electrical power.

4. Set the gas control knob in the “ON” position.

5. Set the thermostat above room temperaturae.

6. The ignitior will spark and the main burners will ignite.

Many soaps used for leak testing are corrosive to certain
metals. Piping must be rinsed thoroughly with clean water
after leak check has been completed.

Manifold Pressure Adjustment:

Turn OFF the gas and electrical before proceeding!

Remove the manifold pressure tap pipe plug from the gas
valve (Figure 9 outlet pressure tap) and install a pressure
tap and connect it to a manometer. Turn on the gas and
electrical supplies, then measure the manifold pressure with

the furnace in operation.

Remove the cap to access the screw for input

adjustment (Figure 9 Pressure Regulator). Turn regulator-

adjusting screw IN to increase pressure, OUT to
decrease pressure. Replace the cap. Measure the

manifold pressure.

For natural gas, best results are obtained with a manifold
pressure of 3.2” to 3.5” w.c. For units that have been
converted to LP (Propane) gases, a manifold pressure of
10” w.c. is necessary. After proper adjustment, turn OFF
gas, replace manifold pressure tap pipe plug and turn ON
gas.

506307-01 Page 17 of 36Issue 1207

WARNING

WARNING

At higher altitudes and varying heating valves, manifold
pressure or orifice changes maybe required. Consult
Tables 6 and 7 for appropriate values. Failure to follow
this warning could lead to a hazardous furnace operating
condition and result in serious bodily injury or loss of life.

Determining Furnace Input - Natural Gas ONLY:

NOTE: Burner access panel of furnace must be in place

when checking gs input.

1. Turn OFF all other gas appliances (except for pilot burners)
served by the same gas meter.

2. With furnace operating in full heat cycle, note how many
seconds it takes for one full revolution of the smallest dial
on the meter. Typically, this will be a 1/2 - or - 1 - cubic
foot test dial.

3. Using the number of seconds for one revolution and the
size of the meter dial, determine the cubic foot per hour
of gas flow by using the formula provided below or Table

4.

Cubic Ft/Hr =
Time (in seconds) Required for Number of Timed Revolutions

Number of Dial Revolutions x Cubic Foot/Revolution x 3600

Furnace input should be maintained within ± 2% of the
value on the rating plate or appropriate altitude derate.
Adjust manifold pressure or change main orifices size if
required.

5. Calculate the unit’s input rate.

Example: If the heating value of the natural gas is

1015 Btu/cu. and it takes 60 seconds to
burn 2 cu. ft. of gas then:

Input = 1015 Btu/cu. ft. x 1 rev x 2 cu. ft./rev. x 3600

60 sec.

Input = 121,8000 btu/hr.

Burner Orifice Sizing:

The furnace is supplied with standard orifices for the
gas shown on the rating plate. Table 5 shows combinations
of heating values and specific gravities for various gases,
from which proper input can be obtained.

If changing orifices is required, remove the manifold from
the furnace (following the instructions found on page 21)
and replace orifices as required by Table 5, the altitude
derating section of this instruction or as local code dictates.

Gas Rate (Cubic Feet per Hour)

Table 4

4.Calculate the furnace input using the following formula:

BTUH = Cubic Ft/Hr x BTU/Cubic Foot

The local gas supplier should be able to provide the heating
value of the gas, in BTU/cubic foot. If a specific value is not
available, use 1000 BTU/cubic foot for Natural gas or 2500
BTU/cubic foot for Propane (LP).

Burner Orifice Selection

Table 5

After securing the manifold assembly, replace all other
components and/or wiring, being sure that all connections
and screws are tightened properly.

Altitude Derating:

The following information is provided as guidelines for
altitude derating and is not meant to supersede any state or
local codes. Local codes have priority over any others and
in some case might limit your options in dealing with an
altitude derate situation.

Page 18 of 36 506307-01Issue 1207

NOTE: In Canada for altitudes up to 4500 ft. (1372 m) see

the rating label on this furnace for proper manifold
pressure and orifice size. Certification for
installations at altitudes over 4500 ft. (1372 m) is
the jurisdiction of local authorities.

Check with your local gas company to find out if the gas
supply in your area is derated. Gas deration negates the
necessity of performing any adjustment on the furnace.

If your gas supply is not derated, and regardless of the
type of gas used, installation of this furnace at elevations
above 2,000 ft. requires a n input reduction at the rate of
four percent (4%) for each 1,000 ft. above sea level.

Unless an orifice change is specified by an applicable
code, or the furnace is to be installed above 6,999 feet, the
recommended method of altitude derating this furnace is to
appropriately lower your manifold pressure. The appropriate
manifold pressures based on the elevation and the heating
value can be found in Table 6.

High Altitude Manifold Pressure Derate

(with standard 42 orifice Natural / 54 orifice LP sizes)

Table 6

If local codes require an orifices change or if the furnace
installation is above 6,999 feet. The appropriate orifice size
based on the elevation and the heating value can be found
in Table 7. Sizing of the orifice must be based o the previously
mentioned 4% derate for each 1,000 feet for installations at/
or above 2,000 feet rule and the orifices must be drilled in
such a way as to assure concentricity. Hand drilling of

orifices is unacceptable.

High Altitude Orifice Size Derate

WARNING

Hand drilling of orifices is never acceptable since it could
lead to delayed igntion, overfiring, improper combustion,
flashback and flame rollout. All these conditions could
lead to a fire hazard and bodily harm, or loss of life.

Blower Adjustment Checkout:

Prior to any blower adjustment, electrical service must

be turned OFF.

This furnace is equipped with a 3 speed direct drive
motor to deliver a temperature rise within the range specificed
on the rating label, between the return and supply plenums,
at the external duct static pressure noted on the rating label.

Adjust the blower speed so that the temperature rise is
within the rise specified on the rating label. Consult the wiring
diagram for speed changes on the direct drive motor.

Limit Control Checkout:

After the furnace has been in operation for at least 15
minutes, restrict the return air supply by blocking the filters
or closing the return registers and allow the furnace to shut
down on hight limit. The main burners will shut OFF and the
main blower and combustion blower should continue to run.
Remove the restriction and the burners should come back
on in a few minutes.

Flame Rollout Switch:

This unit is equipped with two (2) manual reset flame­rollout switches that protects against improper venting of
the flue gases from the heat exchanger due to blockage
causing heat (or flames) to “rollout” into the burner box from
the heat exchangers, either safety device will activate and
shut off power to the automatic gas valve before there is
damage to the furnace. The loss of power to the gas vlave
will shut off the gas burners. Should this occur, it will be
necessary to determine the cause of the rollout, correct the
condition that caused it, and reset the flame-rollout switch

Table 7

For installation above 2,000 feet if unit is adjusted for
altitude mark the furnace label that has the words “Altitude
Adjusted”.

506307-01 Page 19 of 36Issue 1207

WARNING

The furnace should be allowed to cool-off before
attempting to reset the switch. Failure to follow these
instructions could result in injury due to burns.

The switches are located behind the burner access

panels they are accessed by removing the burner access
panels from the furnace, and are reset by pushing in the
button in the middle of the switch (between the two wire
connections - See Figure 11). Very little force is required to
push the reset button, and a “click” should be heard when
the switch resets.

FLAME ROLLOUT SWITCH

Figure 11

Pressure Switch Check:

To check the operation of the pressure switch vent safety

control, remove the vent from the combustion blower. Place
the furnace into operation. Gradually cover up the blower
outlet; the main burners should shut OFF. Remvoe the
restriction and the unit should relight. Replace the vent
adaptor and reseal the opened joints as required.

The operational checkout is now complete. Be sure to

adjust the thermostat to the desired setting and inform the
homeowner how to operate the furnace system before
leaving the job site.

WARNING

If the pressure switch activates to shut the furnace down,
the vent system must be checked and cleared. Failure
to do so may result in serious bodily harm or nuisance
furnace shutdown and/or a hazardous condition that may
lead to property damage, personal injury or death.

Page 20 of 36 506307-01Issue 1207

BLOWER
ACCESS
PANEL

BURNER/MANIFOLD
ASSEMBLY

BURNER
ACCESS
PANEL

CONTROL
BOX
COVER

F0000322

FORWARD
MANIFOLD
SUPPORT

MAINTENANCE

SERVICING THE FURNACE

WARNING

ELECTRICAL SHOCK, FIRE OR EXPLOSION
HAZARD.

Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death or property
damage.

Improper servicing could result in dangerous operation,
serious injury, death or property damage.

• Before servicing, disconnect all electrical power to
furnace.

• When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.

• Verify proper operation after servicing.

WARNING

The ability to properly perform maintenance on this
equipment requires certain mechanical skills and tools.
If you are at all uncertain, contact your dealer for qualified
maintenance and service since improper service could
lead to furnace shutdown or a hazardous condition which
could lead to an unsafe condition and bodily harm.

Combustion Component Check:

The heat exchanger, gas burners and venting system
must be checked each year, prior to the heating season, by
a qualified dealer/serviceman.

The following procedures should be performed:

1. Remove the burner/manifold assembly from the furnace,

follow the instructions found on this page.

2. Place the burner/manifold assembly on a flat work area

and vacuum the burners. It might be necessary to use a
soft bristly brush to remove dirt and then vacuum.

3. Remove the burner opening inlet plate. This will expose

the burner openings of the primary heat exchangers.

4. Vacuum the length of each heat exchanger tube using a

straight attachment into the burner openings and then
vacuum the burner box.

5. Replace the burner opening inlet plate, and burner/

manifold assembly. Insure that all gaskets are properly
positioned and that no leaks exist.

6. Reattach all wiring and piping as per the wiring diagram

and installation instructions.

7. Turn on utilities and check for leaks using soapy water

and a brush.

506307-01 Page 21 of 36Issue 1207

8. A visual check of the main burner should be made at the
beginning of each heating season.

9. Check the input rate and adjust if necessary.

10. Perform a safety check of the limit control and pressure
switch.

11. Check the air filter, clean and/or replace as necessary.

12. Replace the appropriate access panels or doors.

WARNING

Never use an open flame when testing for gas leaks!
Use of an open flame could lead to a fire or explosion!

CAUTION

Many soaps used for leak testing are corrosive to certain
metals. Piping must be rinsed thoroughly with clean water
after leak check has been completed.

Manifold (or Burner/Manifold) Removal/Replacement:

1. Make sure that all utilities (gas and electricity) are turned
off upstream of the furnace.

2. Disconnect the gas line from the gas valve. Be sure that
a wiring diagram is available, or be ready to mark any
wires that are disconnected. Unplug the two (2)
connectors from the gas valve, three (3) connectors from
the rollout switch, flame sensor and sparker ignitor wire.

3. Remove burner access panel and the two (2) screws
holding the forward manifold supports.

4. Slide the burner/manifold assembly forward through the
burner access opening. Being careful not to jare the
sparker or flame sensor.

FURNACE PANEL REMOVAL

Figure 12

5. Slide the burner/manifold assembly forward, out of the
furnace until the assembly is clear of the manifold retention
pins.

6. To reinstall the burner/manifold assembly, reverse the
above steps.

Blower Removal/Replacement:

Removal

1. Turn OFF all electrical power to the furnace.

2. Remove the blower access panel.

3. Unplug wires from the blower assembly, auxiliary limit
and door interlock switch to the control box.

4. Remove the two (2) blower retaining screws from the front
blower leg (See Figure 13). These are the two (2) screws
located in the blower compartment that secure the blower
leg to the blower partition panel.

5. Slide the blower forward about two (2) inches. This will
disengage the rear blower leg from the blower partition.
Rotate the blower down to clear the top of the unit and
continue sliding the blower forward until it is out of the
unit.

BLOWER REMOVAL AND REPLACEMENT

Figure 13

Replacement

1. Place the blower in the blower opening of the unit and
slide the blower back, into the unit, taking care to clear
the top of the unit.

2. When the blower is completely into the cabinet, rotate the
rear of the blower up so that the face of the rear blower
leg engages the back partition clip in the blower partition.

3. Continue sliding the blower into the unit until the front leg
lies flat against the blower partition and blower retaining
screw holes are aligned. The rear of the blower should
be against the clip in the partition and should be under
the partition clip.

4. Reattach the two (2) blower securing screws, any
disconnected wiring and the blower access panel.

Lubricating Motors:

Direct drive motor and blower assemblies are factory
lubricated and normally do not require oiling. If oiling is
required lubrication of the blower motor is to be preformed
only by a qualified service agency.

Page 22 of 36 506307-01Issue 1207

SEQUENCE OF OPERATION

DIRECT IGNITION SYSTEM CONTROL

506307-01 Page 23 of 36Issue 1207

LED Fla shLED Fla sh

CodeCode

Ind icatesInd icates Chec k/RepairChec k/Repair

OFF

Control not powered or gas valve/control
failure.

1. Line voltage input power at L1 and L2 connectors on (IFC) Board.

2. Low voltage (24Vac) power at 24VAC and COM on (IFC) board.

3. Fuse open on (IFC) board.

4. System wiring harness in good condition and securely connected at
both ends.

6. Control not functioning, replace.

"Heartbeat" Normal Operation (Standby).

Fast

"Heartbeat"

Call for heat.

2 Flashes Ignition re-try or recycle error.

1. Gas supply off or supply pressure too low to operate appliance.

2. Damaged or broken spark element.

3. Appliance power supply not properly earth grounded.

4. Flame sense rod contaminated, grounded to appliance chas si s, or
in incorrect location.

5. Spark elem ent or flame sense wiring not properly connected.

6. Gas valve stuck, replace.

7. Move gas control switch to ON.

3 Flashes

Pressure switch closed when should be
open—system waits until pressure switch
opens, then proceeds with ignition sequence.
Pressure switch or aux. limit was sti ll open 60
seconds after the inducer was energized.
System i s in 5-minute delay mode, with
inducer on. After 5-minute delay, new ignition
sequence is initiated.

1. Pressure switch stuck closed.

2. Pressure switch mi s-wired, jumpered or tubing open.

3. Pressure switch captured or out of calibration, replace.

4. Inducer and inducer wiring not connected.

5. Low line voltage power supply.

6. Obstructions or restrictions in appliance air intake or exhaust flue
system that prevent proper combustion air flow.

7. Blower not operating.

4 Flashes

Limit or flame rollout switch open.
Combustion air blower is energized. The
heat speed circulating air fan will be
energized. System waits for limit string to
close, then initiates a new ignition sequence.
System will remain waiting until flame rollout
manual reset is activated.

1. Open high temperatures limit.

2. Open manual reset flame rollout switch in the limit circuit.

3. Limit and rollout switch circuit wiring in good condition and securely
connected.

4. Circulating air fan wiring and operation.

5. Dirty air filters.

6. Blower speed too low.

7. Registers closed.

5 Flashes

Flame signal sensed out of proper sequence
(with flame signal still present). Combustion
blower energized. T he heat speed ci rculation
air fan will be energized after the selected
heat fan on delay. Sy stem waits for flam e
signal to disappear, then goes to Soft
Lockout.

1. Flame at main burner.

2. Flame sense ground to chassis

Steady

ON

Control board fault hard lockout.

1. System wiring harness in good condition and securely connected at
both ends.

2. All components functioning properly (i.e. inducer, blower, ignitor....).

3. Replace IFC control board.

LED Fla shLED Fla sh

CodeCode

Ind icatesInd icates Chec k/RepairChec k/Repair

OFF

Control not powered or gas valve/control
failure.

1. Line voltage input power at L1 and L2 connectors on (IFC) Board.

2. Low voltage (24Vac) power at 24VAC and COM on (IFC) board.

3. Fuse open on (IFC) board.

4. System wiring harness in good condition and securely connected at
both ends.

6. Control not functioning, replace.

"Heartbeat" Normal Operation (Standby).

Fast

"Heartbeat"

Call for heat.

2 Flashes Ignition re-try or recycle error.

1. Gas supply off or supply pressure too low to operate appliance.

2. Damaged or broken spark element.

3. Appliance power supply not properly earth grounded.

4. Flame sense rod contaminated, grounded to appliance chas si s, or
in incorrect location.

5. Spark elem ent or flame sense wiring not properly connected.

6. Gas valve stuck, replace.

7. Move gas control switch to ON.

3 Flashes

Pressure switch closed when should be
open—system waits until pressure switch
opens, then proceeds with ignition sequence.
Pressure switch or aux. limit was sti ll open 60
seconds after the inducer was energized.
System i s in 5-minute delay mode, with
inducer on. After 5-minute delay, new ignition
sequence is initiated.

1. Pressure switch stuck closed.

2. Pressure switch mi s-wired, jumpered or tubing open.

3. Pressure switch captured or out of calibration, replace.

4. Inducer and inducer wiring not connected.

5. Low line voltage power supply.

6. Obstructions or restrictions in appliance air intake or exhaust flue
system that prevent proper combustion air flow.

7. Blower not operating.

4 Flashes

Limit or flame rollout switch open.
Combustion air blower is energized. The
heat speed circulating air fan will be
energized. System waits for limit string to
close, then initiates a new ignition sequence.
System will remain waiting until flame rollout
manual reset is activated.

1. Open high temperatures limit.

2. Open manual reset flame rollout switch in the limit circuit.

3. Limit and rollout switch circuit wiring in good condition and securely
connected.

4. Circulating air fan wiring and operation.

5. Dirty air filters.

6. Blower speed too low.

7. Registers closed.

5 Flashes

Flame signal sensed out of proper sequence
(with flame signal still present). Combustion
blower energized. T he heat speed ci rculation
air fan will be energized after the selected
heat fan on delay. Sy stem waits for flam e
signal to disappear, then goes to Soft
Lockout.

1. Flame at main burner.

2. Flame sense ground to chassis

Steady

ON

Control board fault hard lockout.

1. System wiring harness in good condition and securely connected at
both ends.

2. All components functioning properly (i.e. inducer, blower, ignitor....).

3. Replace IFC control board.

TROUBLE SHOOTING With LED Indicator Assistance

Soft Lockout

The control shall not initiate a call for heat or call for continuous fan while in lockout. A call for cooling operates as normal.
The control will still respond to an open limit and desired flame. Lockout shall automatically reset after 1 hour. Lockout may
be manually reset by removing power from the control for more than 1 second or removing the thermostat call for heat for
more than 1 and less than 20 seconds.

Hard Lockout

If the control detects a fault on the contorl board, the status LED will be energized steady and the control will lockout as
long as the fault remains. A hard lockout will automatically reset if the hardware fault clears.

Page 24 of 36 506307-01Issue 1207

WIRING DIAGRAM

f0000321

506307-01 Page 25 of 36Issue 1207

FOR MASSACHUSETTS ONLY

IMPORTANT

For Side Wall Horizonal Venting

The installation must comply with 248 CMR 5.08 Modifications to sections of NFPA-54,
Chapter 10 as listed below.

* “a) For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure

used in whole or in part for residential purposes, including those owned or operated by the Commonwealth
and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the
area of the venting, including but not limited to decks and porches, the following requirements shall be
satisfied:

1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side wall
horizontal vented gas fueled equipment, the installing plumber or gasfitter shall observe that a hard wired
carbon monoxide detector with an alarm and battery back-up is installed on the floor level where the gas
equipment is to be installed. In addition, the installing plumber or gasfitter shall observe that a battery
operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the
dwelling, building or structure served by the side wall horizontal vented gas fueled equipment. It shall be
the responsibility of the property owner to secure the services of qualified licensed professionals for the
installation of hard wired carbon monoxide detectors
a. In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or

an attic, the hard wired carbon monoxide detector with alarm and battery back-up may be installed
on the next adjacent floor level.

b. In the event that the requirements of this subdivision can not be met at the time of completion of

installaiton, the owner shall have a period of thirty (30) days to comply with the above requirements;
provided, however, that during said thirty (30) day period, a battery operated carbon monoxide detector
with an alarm shall be installed.

2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in
accordance with the above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS
certified.

3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the
building at a minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal
for the horizontally vented gas fueled heating appliance or equipment. The sign shall read, in print size no
less than one-half (1/2) inch in size, “GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL
OBSTRUCTIONS”.

4. INSPECTION. The state or local gas inspector of the side wall horizontally vented gas fueled equipment
shall not approve the installation unless, upon inspection, the inspector observes carbon monoxide
detectors and signage installed in accordance with the provisions of 248 CMR 5.08(2)(a)1 through 4.

(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a) 1 through 4:

1. The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current
edition of NFPA 54 as adopted by the Board; and

2. Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure
separate from the dwelling, building or structure used in whole or in part for residential purposes.”

Page 26 of 36 506307-01Issue 1207

** “c) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED. When

the manufacturer of Product Approved side wall horizontally vented gas equipment provides a venting
system design or venting system components with the equipment, the instructions provided by the
manufacturer for installation of the equipment and the venting system shall include:

1. Detailed instructions for the installation of the venting system design or the venting system components;

and

2. A complete parts list for the venting system design or venting system.

(d) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED. When

the manufacturer of a Product Approved side wall horizontally vented gas fueled equipment does not
provide the parts for venting the flue gases, but identifies “special venting systems”, the following
requirements shall be satisfied by the manufacturer:

1. The identification of each “special venting system” shall include the listing of either the website, phone

number or manufacturer’s address where the venting system installation instructions can be obtained;
and

2. The “special venting systems” shall be Product Approved by the Board, and the instructions for provided

with that system shall include a parts list and detailed installation instructions.

(e) A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled

equipment and all the venting instructions, parts lists, and/or design instructions for the venting system
shall remain with the appliance or equipment at the completion of the installation.”

* Text from Commonwealth of Massachusetts Official Website of the Office of Consumer Affairs & Business Regulation

(OCABR).

** Text from Joseph A Peluso, Jr. (Executive Director Board of State Examiners of Plumbers and Gas Fitters,

Commonwealth of Massachusetts) letter of April 24, 2007 to GAMA.

506307-01 Page 27 of 36Issue 1207

NOTES

Page 28 of 36 506307-01Issue 1207

USER’S INFORMATION MANUAL

Gas-Fired Furnace

Read all instructions in this manual and retain this and all additional instructions for future reference.

Congratulations...

...you have one of the most modern gas furnaces made.
Your unit has been carefully selected to keep you warm and
comfortable during the winter months. It will deliver superb
performance with only minimal help from you.

WARNING

FIRE OR EXPLOSION HAZARD

To keep your operating costs low and to eliminate
unnecessary service calls, we have provided a few
guidelines. These guidelines will help you understand how
your gas furnace operates and how to maintain it so you
can get years of safe and dependable service. Read all the
instructions in this manual, and keep all manuals for
future reference.

AHRI Certified

The Air-Conditioning, Heating and Refrigeration Institute
(AHRI) symbol verifies that Annual Fuel Utilization Efficiency
(AFUE) ratings for our gas furnaces have been derived from
U.S. Government standard tests.

Failure to follow the safety warnings
exactly could result in serious injury,
death, or property damage.

– Do not store or use gasoline or other

flammable vapors and liquids in the
vicinity of this or any other appliance.

– WHAT TO DO IF YOU SMELL GAS

• Do not try to light any appliance.

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

• Leave the building immediately.

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

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

CSA International Design Certified

The CSA International symbols on each nameplate is your
assurance that your furnace design meets nationally
recognized standards for safety and performance.

506307-01 Page 29 of 36Issue 1207

– Installation and service must be

performed by a qualified installer,
service agency, or the gas supplier.

IMPORTANT SAFETY INFORMATION

WARNING

ELECTRICAL SHOCK, FIRE,

OR EXPLOSION HAZARD

Failure to follow the safety warnings exactly could
result in dangerous operation, serious injury, death,
or property damage.

Improper servicing could result in dangerous
operation, serious injury, death, or property damage.

• Before servicing, disconnect all electrical power
to furnace.

• When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.

• Verify proper operation after servicing.

For your safety, read the following before operating your
furnace:

5. Should the gas supply fail to shut off or if overheating
occurs, shut off the gas valve to the furnace before
shutting off the electrical supply.

6. Do not use the furnace if any part has been under
water. A flood-damaged furnace is extremely
dangerous. Attempts to use the furnace can result in
fire or explosion. A qualified service agency should
be contacted to inspect the furnace and to replace
all gas controls, control system parts, electrical parts
that have been wet, or the furnace if deemed
necessary.

7. Examine the furnace installation to determine that:

A. All flue gas carrying areas external to the furnace,

such as the chimney and vent connector, are
clear and free of obstructions.

B. Vent connector is in place, slopes upward, and

is physically sound without holes or excessive
corrosion.

1. The furnace area must be kept clear and free of
combustible materials, gasoline, and other flammable
vapors and liquids.

2. Insulating materials may be combustible. A furnace
installed in an attic or other insulated space must be
kept free and clear of insulating materials. Examine
the furnace when it is installed and also any time
insulation is added.

3. For proper and safe operation, the furnace needs air
for combustion and ventilation. Do not block or
obstruct air openings on the furnace, air openings to
the area in which the furnace is installed, and the
spacings around the furnace.

4. This furnace is equipped with an ignition device which
automatically lights the burners. See OPERATING
YOUR FURNACE on this page for information on
lighting and shutting down the furnace.

OPERATING YOUR FURNACE

These furnaces are equipped with an ignition device which
automatically lights the burners. Do not try to light the

burners by hand.

Before operating, smell around furnace area for gas. Be

sure to smell near floor because some gas is heavier than air

C. Return air duct connection(s) is physically sound,

sealed to the furnace casing, and terminates
outside the space containing the furnace.

D. Physical support of the furnace is sound without

sagging, cracks, gaps, etc. around the base as
to provide a seal between the support and the
base.

E. There are no obvious signs of deterioration of

the furnace.

F. Burner flames are in good adjustment (see

Burner Flame beginning on page 34).

8. It is important that you conduct a physical inspection
of the furnace at least twice a year. It is also
recommended that the furnace should be inspected
by a qualified service agent at least once per year.

and will settle to the lowest point. See WHAT TO DO IF YOU
SMELL GAS on page 29 if the odor of gas is present.

Use only your hand to turn the gas control knob; never use
tools. If the knob will not turn by hand, don’t try to repair it.
Call a qualified service technician. Force or attempted

repair may result in a fire or explosion.

Page 30 of 36 506307-01Issue 1207

Lighting Instructions

1. STOP! Read the previous safety information.

2. Set the thermostat to the lowest setting.

3. Turn off all electric power to the furnace.

4. Remove the burner compartment access panel.

To Turn Off Gas to Furnace

1. Set the thermostat to the lowest setting.

2. Turn off all electric power to the furnace if service is to
be performed.

3. Remove the burner compartment access panel.

4. Move the gas control knob or switch to “OFF” (see Figure

1). Do not force.

5. Replace the burner compartment access panel.

5. This appliance is equipped with an automatic ignition
device. Do not try to light the burners by hand.

6. Move the gas control knob or switch to “OFF” (see
Figure M-1).

Gas Valves

Alternate Lever

Switch

Honeywell

Single Stage

Figure M-1

7. Wait 5 minutes to clear out any gas, then smell for gas
(including at the bottom of the unit near the ground). If
you smell gas, stop and follow the directions in WHAT
TO DO IF YOU SMELL GAS on page 29. If you don’t
smell gas, continue to next step.

Temperature Control

There are many types and styles of thermostats. Yours may
look different from the one shown in Figure M-2 on page 32,
depending on the type of thermostat and whether cooling was
installed with the system. However, almost all thermostats
perform the same basic functions described in the following
section.

Thermostat Operation

There are four buttons located on the thermostat (see Figure
M-2 on page 32). One button controls the heating and cooling
(if applicable) functions. Another Button is for “FAN”
operation, either continuous or automatic. The remaining
two buttons set the temperature range for the heating
temperature and the cooling temperature desired.

To put the system into operation, push the button to either
“HEAT” or “COOL” position. After choosing the type of
operation, set the thermostat to the temperature you would
like the system to maintain.

Fan Operation

You may wish to increase your comfort by setting your system
for continuous air circulation of the indoor air. The fan switch
on the thermostat permits you to do this (see Figure M-2 on
page 32).

8. Move the gas control knob or switch to “ON”.

9. Replace the burner compartment access panel.

10. Turn on all electric power to the furnace.

11. Set the thermostat to the desired setting.

12. If the furnace will not operate, follow the instructions
found below in To Turn Off Gas to Furnace and call
your service technician or gas supplier.

Shutting Down the Furnace

To shut down the furnace, set the thermostat to the “OFF”
position.

506307-01 Page 31 of 36Issue 1207

With the switch in the “ON” position the fan will operate
continuously. “AUTO” position gives fan operation only when
the unit is in either heating or cooling.

Furnace Operation

If your furnace is operating but fails to provide complete
comfort, check the following before calling for service:

1. Be sure the thermostat setting is correct.

2. Check to see if the filter is clean.

3. Be sure air can circulate freely throughout your home.
Do not block supply registers or return grilles with
furniture or rugs.

Thermostat

Figure M-2

And if you also have cooling...

4. Keep surface of the outdoor coil free from dirt, lint, paper,
or leaves.

5. Check and clean indoor coil, if necessary. (This check
should be made at the start of each cooling season by a
qualified service technician.)

If your furnace fails to operate, check the following:

1. Be sure the main switch that supplies power to the
furnace is in the “ON” position.

2. Replace any burned-out fuses or reset circuit breakers.

3. Be sure the thermostat is properly set.

If the furnace still does not start, call a qualified service
technician.

MAINTENANCE OF YOUR FURNACE

WARNING

Always shut off all power to the unit before attempting
any of the following maintenance procedures. Failure
to do so may result in personal injury.

There are routine maintenance steps you should take to keep
your furnace operating efficiently. This maintenance will
assure longer life, lower operating costs, and fewer service
calls. In addition to the maintenance procedures listed in
this manual, there are also other service and maintenance
procedures that require the skills of a service person who has
specialized tools and training. Personal injury can result if
you are not qualified to do this work. Please call your dealer
when service is needed.

Your gas furnace is designed to give many years of efficient,
satisfactory service. However, the varied air pollutants
commonly found in most areas can affect longevity and
safety. Chemicals contained in everyday household items
such as laundry detergents, cleaning sprays, hair sprays,
deodorizers, and other products which produce airborne
residuals may have an adverse affect upon the metals used
to construct your appliance.

The cabinet of the furnace can be cleaned with soap and
water. Grease spots can be removed with a household
cleaning agent.

It is important that you conduct periodic physical inspections
of your appliance, paying special attention to the gas burner
and the flue outlet from the furnace. These components are
located at the front of the unit. A flashlight will be useful for
these inspections. Make one inspection prior to the beginning
of the heating season and another during the middle.

Should you observe unusual amounts of any of the following
conditions, it is important that you call your authorized dealer
at once to obtain a qualified service inspection:

Page 32 of 36 506307-01Issue 1207

• Rust, flakes, or other deposits

• Coatings

• Corrosion

Even if no unusual rust or other conditions are observed, it

is recommended that the furnace be inspected and
serviced at least once per year by a qualified service
technician. Regular inspections and planned maintenance

will assure many years of economical performance from your
gas furnace.

Combustion and Ventilation Air

Adequate air supply must be provided to furnaces located in a
closet, alcove, or utility room by means of upper and lower

grilles in the door, or by the introduction of outside air, or both,

BTU
INPUT

FILTER
SIZE

50,000

75,000

100,000

125,000

13 X 23

13 X 23

16 1/2 X 26

20 X 23

in accordance with the

National Fuel Gas Code, ANSI Z223.1/
NFPA 54 (latest edition) or the CSA B149.1, Natural Gas and
Propane Installation Codes, and local codes.

WARNING

Adequate combustion and ventilation air must reach
the furnace to provide for proper and safe operation.
Air openings in front of furnace must be kept free of
obstructions. Any obstruction may cause improper
operation that can result in a fire hazard or carbon
monoxide injury.

Venting and Furnace Support

Venting of this furnace must comply with the unit Installation
Instructions. Be sure the installer has followed these
requirements. If not, you should request the installer to
comply as soon as possible.

For your safety, please note the following:

1. 80% furnaces may be common vented with another

appliance in certain circumstances. Refer to the
installation instructions and Category I Venting Tables,
National Fuel Gas Code, ANSI Z223.1/NFPA 54 (latest
edition) or the CSA B149.1, Natural Gas and Propane
Installation Codes, and local codes for proper installation
guidelines.

2. This furnace is not designed for use with a vent damper.

Use of such a device will not improve the efficiency of
this furnace.

The vent from your furnace may rise vertically and terminate
above the roof. When horizontal venting an 80% furnace, an
approved sidewall venter must be used. Refer to the Installation
Instructions for further information on horizontal venting of an
80% furnace.

Make sure all flue product materials external to the furnace
are clear and free of any obstruction, slope upward, and have
no holes or leaks. For proper venting terminations, see the
Installation Instructions furnished with the furnace.

to prevent operation of the furnace until the condition has been
corrected. Contact your dealer if you desire more information
about this important safety feature.

NOTE: After any heavy snow, ice or frozen fog event
the furnace vent pipes may become restricted. Always
check the vent system and remove any snow or ice that
may be obstructing the exhaust pipes.

Should any unusual conditions be observed during your
inspections, call an authorized service dealer immediately.

Return Air

All return air duct connections must be tight and sealed to
furnace cabinet and all return air grilles or registers must
be located outside the space containing the furnace.

Cleaning/Replacing the Filter

It is very important to clean or replace the air filter regularly.
Dirty filters are the most common cause of inadequate
heating or cooling performance and can sharply increase
the operational costs of your unit. In some cases, they can
double the cost. The air filter should be inspected at

least every 6 weeks and cleaned or replaced as required.

Your furnace may use either a disposable filter or a cleanable
filter. The type of filter may be indicated on a label attached
to the filter. If a disposable filter is used, replace with the
same type and size. To remove excess dirt from a cleanable
filter, shake filter and/or use a vacuum cleaner. Wash filter
in soap or detergent water and replace after filter is dry.
Cleanable filters do not need to be oiled after washing.

Cleanable filters may be replaced with disposable filters.
Refer to Table 1 on page 33 when selecting the proper size
and quantity of disposable filter.
If your air distribution system has a central return air filter­grille, the furnace does not need a filter. Filter-grilles can be
maintained the same way as cleanable filters (see above).

Minimum Filter Requirements

Check to see that the furnace cabinet is sound and firmly
supported, without sagging. There should be no cracks or
gaps between the furnace and the base or floor, which would
permit entry of unfiltered air.

It is important that the outside area where the vent terminates
is kept clear of any obstructions which might block or impede
the venting of the furnace. Screens in vent terminals should
be cleaned periodically. Should venting become blocked at
anytime, your furnace is equipped with a special safety control

506307-01 Page 33 of 36Issue 1207

Table 1

Lubrication

Heat

Exchanger

Burner

Flame

(Blue Only)

Burner

Gas

Manifold

Lubrication of the bearings in the circulating air blower motor
and the combustion blower motor is not recommended.

Burner Flame

While the furnace is in operation, observe the burner flames.
Compare these observations to Figure M-3 to determine if
proper flame adjustment is present. If your observations
indicate improper flame adjustment, call your authorized
service dealer for service. Do not attempt to adjust flame!
Your service representative will perform this adjustment
correctly.

Rollout Switch

This unit is equipped with a manual reset high temperature
sensor or rollout switch. In the unlikely event of a sustained
burner flame rollout, the rollout switch will shut off the flow of
gas by closing the gas valve. The switch is located inside the
gas burner area. Flame rollout can be caused by blockage of
the power vent system, a blocked heat exchanger, or improper
gas pressure or adjustment. If this event occurs, the unit will
not operate properly. The gas supply to the unit should be
shut off and no attempt should be made to place it in
operation. The system should be inspected by a qualified
service technician.

Safety Interlock Switch

The blower compartment door on your high efficiency gas
furnace is equipped with a safety interlock switch that will
automatically shut off your complete system (including
blower) once the door is removed. This is for your personal
safety. Be sure to check your furnace for proper operation
once the door or panel has been replaced. If the system
does not operate once the panel has been replaced, try
removing and replacing it once again. If the furnace still
does not operate, call your dealer for service.

REPAIR PARTS

The following repair parts are available from your local
distributor. When ordering parts, include the complete
furnace model number and serial number which are printed
on the rating plate located on the furnace.

Gas Control Group

Manifold Orifice
Manifold Retention Plate Ignition Wire
Burner Gas Valve

Heat Exchanger Group

Primary Heat Exchanger Transfer Tube
Flue Box Burner Inlet Plate
Burner Box

Blower Group

Blower Assembly Capacitor
Blower Housing Blower Cutoff
Blower Motor Blower Support
Blower Wheel

Inducer Group

Inducer Blower and Motor Pressure switch

Electrical Group

Control Box Ignition Control
Limit Switch Transformer
Fan Timer Control Board Rollout Switch

Typical Flame Appearance

Figure M-3

Page 34 of 36 506307-01Issue 1207

Owner Record

Furnace Model #________________________________ Serial # ____________________ Installation Date ___________

INSTALLED BY:

Dealer ____________________________________________________________________________________________

Address ___________________________________________________________________________________________

Telephone # __________________________________________ License # _____________________________________

Contact Person _______________________________________

Other Equipment Installed:

Equipment Type ______________________________________

Model # _________________________________ Serial # _________________________ Installation Date ____________

Equipment Type ______________________________________

Model # _________________________________ Serial # _________________________ Installation Date ____________

Equipment Type ______________________________________

Model # _________________________________ Serial # __________________________ Installation Date ___________

WHEN FRENCH IS REQUIRED!

ATTENTION: MR. INSTALLER OR HOMEOWNER

TO OBTAIN INSTALLATION INSTRUCTIONS, USER’S INFORMATION MANUAL AND FURNACE

MARKINGS IN FRENCH CONSULT WITH YOUR DEALER OR LOCAL DISTRIBUTOR:

HAVE AVAILABLE THE MODEL NUMBER AND SERIAL NUMBER LOCATED ON THE UNIT RATING

PLATE TO INSURE THE CORRECT FRENCH INSTRUCTION PACKET.

POUR OBTENIR DE LA DOCUMENTATION EN FRANÇAIS!

A L’ATTENTION DE L’INSTALLATEUR OU DU PROPRIÉTAIRE

POUR OBTENIR LES INSTRUCTIONS D’INSTALLATION, LE MANUEL DE L’USAGER ET LES
MARQUAGES EN FRANÇAIS, CONSULTEZ VOTRE MARCHAND OU LE DISTRIBUTEUR DE VOTRE
RÉGION:

AYEZ EN MAIN LE MODELE ET LE NUMÉRO DE SÉRIE INDIQUÉS SUR LA PLAQUE
SIGNALÉTIQUE DE L’APPAREIL POUR OBTENIR LA POCHETTE D’INSTRUCTIONS EN FRANÇAIS
APPROPRIÉ APPROPRIÉE.

506307-01 Page 35 of 36Issue 1207

INSTALLATION AND SERVICING

INSTRUCTIONS

AND

USER’S INFORMATION MANUAL

** INSTALLER — AFFIX THIS INSTRUCTION

PACKET ADJACENT TO THE FURNACE.

**HOMEOWNER — RETAIN THESE

INSTRUCTIONS FOR FUTURE REFERENCE.

INSTRUCTIONS D’ENTRETIEN ET

INSTALLATION

ET

MANUAL DE L’USAGER

**INSTALLATEUR — PLACEZ LA POCHETTE

D’INSTRUCTIONS À COTÉ DU GÉNÉRATEUR

D’AIR CHAUD.

**PROPRIÉTAIRE — CONSERVEZ CES

INSTRUCTIONS POUR Y RÉFÉRER PLUS TARD.

Page 36 of 36 506307-01Issue 1207