User's Information Manual
Residential Gas Furnaces
FOR YOUR SAFETY
!
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow safety precautions 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.
• 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.
• Extinguish any open flame.
— Installation and service must be
performed by a qualified installer,
service agency, or the gas supplier.
!
AVERTISSEMENT:
RISQUE D’INCENDIE OU
D’EXPLOSION
Le non-respect des consignes de sécurité pourrait
entraîner des blessures graves, la mort ou des
dommages matériels.
IMPORTANT
— Ne pas entreposer ni utiliser de
l’essence ni d’autres vapeurs ou
liquidesinflammablesdanslevoisinage
decetappareil,nidetoutautreappareil.
Read this owner information thoroughly
before attempting to operate or maintain this
furnace to become familiar with the
capabilities and use of your heating
appliance. Keep this with literature on other
appliances where you have easy access to it
in the future. If a problem occurs, check the
instructionsandfollowtherecommendations
given. If the suggestions do not eliminate
your problem, call your NORDYNE Servicing
Contractor (Service PRO).
— QUE FAIRE S’UL Y A UNE ODEUR DE
GAZ
• Ne pas tenter d’allumer aucun appareil.
• Ne toucher à aucun interrupteur
électrique;n’utiliseraucuntéléphone
dans le bâtiment.
• Appeler
immédiatement
le
fournisseur de gaz en employant le
téléphone d’un voisin. Respecter à
la lettre les instructions du
fournisseur de gaz.
Any additions, changes, or conversions
required in order for the appliance to
satisfactorily meet the application needs
mustbemadebyaqualifiedinstaller, service
agency, or the gas supplier using factory
specified and approved parts.
• Si personne ne répond, appeler le
service des incendies.
— L’installationetl’entretiendoiventêtre
effectués par un installateur qualifié,
un organisme de service ou le
fournisseur de gaz.
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80+ AFUE
8
1 Ignitor
2 Flame Sensor
(Not Shown)
3 Gas Valve
4 Flame Roll-out
Switch(s)
5 Pressure Switch
6 Control Board
7 Blower Door
Switch(s)
8 Exhaust Adapter
9 Low Voltage
Transformer
10 Burner Assembly
11 Supply Air Limit
Switch
14
13
6
3
1
5
9
10
11
7
4
12 Blower Assembly
13 Induced Draft
Blower
12
14 Vent Transition
Upflow/Horizontal Furnace
80+ AFUE
15
13
8
9
11
1
4
9
2
7
12
3
16
5
10
6
14
6
14
10
7
5
2
12
3
4
1
13
11
Upflow/Horizontal Furnace
Downflow Furnace
1 Ignitor
8 Vent Assembly
(Upflow Only)
9 Vent Switch
10 Low Voltage
Transformer
11 Burner Assembly
12 Supply Air Limit
Switch
14 Induced Draft
Blower
15 Combustion Tube
w/insulation
(Downflow Only)
16 Vent Transition
Assembly
2 Flame Sensor
3 Gas Valve
4 Flame Roll-out
Switch(s)
5 Pressure Switch
6 Control Board
7 Blower Door
Switch
(Downflow Only)
13 Blower Assembly
Figure 1. Furnace Parts Identified
3
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90+ AFUE
19
18
10
18
4
12
15
17
19
16
7
8
1
6
2
3
11
15
10
5
5
7
13
9
13
9
17
14
11
2
8
12
3
1
14
16
4
Upflow/Horizontal Condensing Furnaces
Downflow Condensing Furnace
8 Blower Door Switch
9 Vent Safety Switch
10 Low Voltage
Transformer
1 Ignitor (Not Shown)
2 Flame Sensor (Not
Shown)
14 Condensate Drain
Tube
15 In-Line Drain
Assembly
3 Gas Valve
4 Flame Roll-out
Switch(s)
5 Pressure Switch
6 Vent Pressure
Switch (93+ Only)
7 Control Board
11 Supply AIr Limit
Switch
12 Circulating Air
Blower Assembly
13 Induced Draft
Blower
16 Burner View Port
17 Front Header Box
18 Combustion Air
Intake
19 Exhaust Vent
Figure 2. Furnace Parts Identified
4
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90+ AFUE Two - Stage Models
20
19
7
20
11
8
5
17
12
7
3
6
9
16
6
4
16
8
14
10
11
18
18
14
10
9
4
12
3
13
5
15
17
15
Upflow/Horizontal Furnace Models
Downflow Furnace Models
1 Ignitor (Not Shown)
2 Flame Sensor (Not
Shown)
3 Primary Gas Valve
4 Secondary Gas Valve
5 Flame Roll-out Switch(s)
6 Pressure Switch
7 Vent Pressure Switch
8 Control Board
10 Vent Safety Switch
11 Low Voltage
16 In-Line Drain
Assembly
Transformer
17 Burner View Port
18 Front Header Box
19 Combustion Air
Intake (Not Shown
on Upflow Model))
20 Exhaust Vent
(Not Shown on
12 Supply Air Limit Switch
13 Circulating Air Blower
Assembly (Not Shown
on Downflow Model)
14 Induced Draft Blower
15 Condensate Drain
Tube
9 Blower Door Switch
Downflow Model)
Figure 3. Furnace Parts Identified
5
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80+ AFUE Two - Stage Models
10
1
2
5
4
3
11
8
6
9
13
7
12
Upflow/Horizontal Furnace
1 Ignitor
2 Flame Sensor
3 Gas Valve
4 Flame Roll-out
Switch(s)
7 Blower Door
Switch
8 Vent Assembly
9 Low Voltage
Transformer
11 Supply Air Limit
Switch
12 Blower Assembly
13 Induced Draft
Blower
5 Pressure Switch
6 Control Board
10 Burner Assembly
Figure 4. Furnace Parts Identified
6
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under water. A flood-damaged furnace is
extremelydangerous.Attempstousethefurnace
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.
GENERAL INFORMATION
This furnace has been designed and built to
provide many years of safe and dependable
home comfort, providing it is properly installed
and maintained. With regular maintenance, this
furnacewilloperatesatisfactorilyyearafteryear.
Abuse, improper use, and/or improper mainte-
nance can shorten the life of the furnace and
createhazardsforyou. Pleasereadthismanual
carefully to familiarize yourself with operation,
maintenance, and safety procedures for this
furnace.
Familiarize yourself with the controls that shut
off the gas and electrical power to the furnace.
If the furnace is to be shut down for an extended
periodoftime, turnoffboththegasandelectrical
power. For your safety always turn off both the
gas and electrical power before performing
service or maintenance on the furnace.
A regular service and maintenance schedule
should be established to insure efficient and
safe operation of the furnace. See Section 5 for
maintenance procedures and schedules.
2. Combustion Air Supply
A furnace needs an adequate supply of
combustion and ventilation air for proper and
safe operation. Follow the installation
instructions included with the furnace to
properly vent air to the combustion air inlet
and exhaust the products of combustion to
the outside from the exhaust vent.
Devices attached to the flue or vent for the
purpose of reducing heat loss up the chim-
ney have not been tested and have not
been included in the design certification
of this furnace. We, the manufacturer, can
not and will not be responsible for injury
For 90+ and 93+ Models: If the furnace is
operatedwitharestrictedcombustionairsupply,
the pressure switch will open, turning off the gas
supply to the burners. (See Figures 2 and 3).
DO NOT install a jumper wire across this switch
to defeat its function. If this switch must be
replaced,useonlythereplacementpartspecified
in the Replacement Parts List.
1. Safety Information
The furnace area and the vicinity of any other
gas appliance must be kept clear and free of
combustible materials, gasoline, and other
flammable vapors and liquids. Do not store or
use flammable items such as paint, varnish, or
strippers in the vicinity of the furnace.
For 80+ Models: If the furnace is operated with
inadequate combustion air supply, the flame roll-
out control switch located above the burners may
open, turning off the gas supply to the burners.
The flame roll-out control is a manually resettable
device (See Figure 1 and 4). DO NOT install a
jumperwireacrossthisswitchtodefeatitsfunction.
DO NOT reset the control without identifying and
correcting the fault condition which caused the
control to trip. If this switch must be replaced, use
only the replacement part specified in the
Do not use the furnace closet or area next to the
furnace as a storage area. This area must be
kept clear, clean, and free of lint. The furnace
must also be kept clear of loose or exposed
insulation materials. Examine the furnace area
when the furnace is installed or when insulation
is added. Some insulation materials may be
combustible.
For proper and safe operation, the furnace
needs air for combustion and ventilation. Do not
block or obstruct air openings on the furnace, or
any air openings where the furnace may be
installed, including any surrounding spaces.
Replacement Parts List.
Air openings in warm air registers, and return air
grilles must not be restricted.
Should the gas supply fail to shut off or if
overheating occurs, shut off gas valve to the
furnacebeforeshuttingoffelectricalsupply.
!
CAUTION:
Combustion air must not be drawn
from a corrosive atmosphere.
Do not use this furnace if any part has been
7
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beconnectedtoanyotherheatproducingdevice
airmustbefreeofchemicalswhichformcorrosive such as a fireplace insert, stove, etc. Doing so
Tomaximizeheatexchangerlife,thecombustion
may result in fire, explosion, personal injury,
carbonmonoxidepoisoning,orpropertydamage.
acidic compounds in the combustion gases.
Someexamplesofthesechemicalsarechlorine,
fluorine, and sulphur. Some common sources of
these chemicals are detergents, bleaches,
Use a type high velocity air filter in the return air
aerosol sprays, cleaning solvents, and a wide duct to maintain a clean heat exchanger.
variety of commercial and household products.
3. Return Air Supply
!
WARNING:
In applications where the supply ducts carry
heated air to areas outside the space in which
the furnace is installed, the return air must be
delivered to the furnace by duct(s) sealed to the
furnace casing. These duct(s) must be full size
and without interruption in the spaces outside of
where the furnace is installed.
Failure to prevent products of com-
bustionfrombeingcirculatedintothe
living space can create potentially
hazardous conditions including car-
bon monoxide poisoning that could
result in personal injury or death.
The return air duct connection(s) must be
physically sound and sealed to the furnace
casing to prevent products of combustion from
entering the living space.
4. Vent System
The furnace must always be connected to an
approved vent pipe to carry the furnace
combustion products outdoors. At the beginning
and end of each heating season, inspect the
outdoor vent terminal closely with a flashlight to
determine if any of the conditions listed under
the following warning exist.
The floor or platform on which the furnace is
mounted must provide sound physical support
of the furnace with no gaps, cracks, or sagging
between the furnace and floor or platform. The
return air and circulating air ductwork must not
FREQUENCY OF MAINTENANCE
BEGINNING OF END OF EACH
MAINTENANCE ITEM
EACH HEATING SEASON HEATING SEASON MONTHLY
VERIFY FURNACE AREA IS FREE
OF COMBUSTIBLE MATERIALS
X
X
X
X
X
X
X
X
X
VERIFY COMBUSTION AND VENTILATION
AIR IS NOT RESTRICTED
VERIFY NO SIGNS OF PHYSICAL
DETERIORATION OF THE FURNACE
VERIFY NO OBSTRUCTIONS OR
RESTRICTIONS IN VENT OR CHIMNEY
X
X
X
X
X
X
VERIFY NO HOLES OR CRACKS IN VENT PIPE
VERIFY NO CORROSION IN VENT PIPE
VERIFY THAT HORIZONTAL VENT PIPES
SLOPE UPWARDS AWAY FROM FURNACE
X
X
X
VERIFY BURNER FLAME
X
X
CLEAN OR REPLACE FILTER(S)
CLEAN BLOWER COMPARTMENT
CLEAN BURNER ASSEMBLY
X
Table 1. Maintenance Table
8
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air blower motors used in these furnaces are
pre-lubricated and sealed at the factory. No
further oiling of the bearings is required for the
life of the motor.
5. Maintenance
Propermaintenanceismostimportanttoachieve
the best performance from this furnace and
should be performed by a qualified service
technician. Follow the maintenance schedule
(see Table 1) and the following instructions for
years of safe, trouble free operation.
Blower Compartment — The blower
compartment should be cleaned monthly during
the heating and cooling seasons to remove any
dirt and lint that may have accumulated in the
compartment or on the blower and motor. Build-
up of dirt and lint on the blower and motor can
create excessive loads on the motor resulting in
higher than normal operating temperatures and
possible shortened service life.
•
Do not place combustible materials on
or against the furnace cabinet.
Do not store gasoline or any other
flammable vapors and liquids in the
vicinity of the furnace.
•
•
•
•
Annuallyinspectthefurnace,ductwork,
and vent system for signs of physical
deterioration.
Changeorreplacetheairfiltersmonthly
during any period when the circulating
blower is operating regularly.
Alwaysreplacethedoorsonthefurnace
afterservicingorcleaning/changingthe
filters. Do not operate the furnace
without all doors and covers in place,
except to check burner operation.
Avoid operating the furnace when
windows and doors are open.
Be sure that the thermostat is properly
installed and is not being affected by
drafts or heat from lamps or other
appliances.
Burner Maintenance — Check the burner
flames at the start of every heating season. Set
the thermostat to a temperature setting above
the room temperature. Remove the top door
from the furnace and visually inspect the burner
through the view hole to make sure that the
flame is drawn into the center of the heat
exchanger tube (See Figure 5). In a properly
adjusted burner assembly, the flame bends
down and to the right at the end of the heat
exchanger tube, and the end of the flame will be
out of sight around the bend. The flame color
shouldbeblue,howeversomelightyellowstreaks
may occur on the outer portions of the flame.
•
•
Air Filter(s) — Air filter(s) are not supplied with
the furnace as shipped from the factory. The
installer must provide a high velocity filter and
rack in the return air duct adjacent to the furnace,
or in a return air grille to the furnace. The filter(s)
mustberemovedandcleanedmonthlyduringthe
heating season to ensure proper furnace
operation. New or newly renovated homes may
require more frequent changing until the
construction dust has been removed.
!
CAUTION:
Some components in the burner
vestibule are at high temperatures
whiletheburnersareoperating.Use
caution to avoid personal injury.
Flame
Burner
!
WARNING:
Neveroperatethefurnacewithouta
filter in place. Dust and lint in the
returnaircanbuildupontheinternal
components, resulting in a loss of
efficiency, equipment damage, and
possible fire.
Always replace the door(s) on the furnace after
servicing or cleaning/changing the filters. Do not
operate the furnace without the door(s) in place.
Manifold
Figure 5. Burner Inspection
Lubrication — The bearings in the circulating
9
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6. Operating Instructions
!
READ THE SAFETY INFORMATION ON
THE FOLLOWING PAGE BEFORE
OPERATING.
WARNING:
Do not operate your furnace if you
findanyofthefollowingconditions.
Such conditions may allow toxic
fumes to escape into your home:
• Obstructions or restrictions in
the vent pipe and/or chimney.
• Holes or cracks in the vent pipe.
• Visiblecorrosionintheventpipe.
• Horizontal vent pipes that do not
slope upward.
!
WARNING:
Shouldoverheatingoccur,orthegas
supply fail to shut off, shut off the
manual gas valve to the furnace
before shutting off the electrical
supply.
Ifanyoftheaboveconditionsarefound
in the vent pipe, call a qualified service
technician to install new vent pipe.
!
ADVERTISSEMENT:
Encasdetempératureexcessive,ou
s’il est impossible de couper
l’alimentationengaz,fermerlerobinet
manuel d’alimentation en gaz du
générateur d’air chaud avant de
couper l’alimentation électrique.
For 80+ upflow and downflow models only:
Burner Maintenance (NOx), If the second or
eighth character of the model number is an “N”
the furnace has factory installed NOx reduction
inserts. The inserts reduce the NOx emissions
of the furnace. The NOx reduction inserts are
located in the first pass of the top portion of the
heat exchanger. When the burners are
operating, the flame should extend through the
center of the NOx reduction inserts. The flame
color should be blue, however some light yellow
streaks may occur on the outer portions of the
flame.
These furnaces are equipped with roll-out limit
switch(s), a vent safety switch, and a pressure
switch(SeeFigures1, 2, 3and4). Thepressure
switch verifies that the flame is receiving
combustion air. If the flame is not drawn into the
heat exchanger tube, the roll out limit switch or
flame sensor, will shut the furnace down.
The vent safety switch shuts the furnace down
if the vent becomes blocked or restricted.
Inspect the burners, mounting brackets, and all
other parts in the vestibule for signs of
deterioration. The burner vestibule should be
vacuumed clean and inspected annually.
Furnace Fails To Operate — If the furnace
does not operate, check the following:
1) Is the thermostat operating properly?
2) Are the blower door(s) in place?
3) Is the furnace disconnect closed?
4) Has the circuit breaker tripped (or fuse
blown)?
!
CAUTION:
Do not strike any of the internal
electrical components while
vacuuming.
5) Is the gas turned on?
6) Is the filter dirty or plugged?
10
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If the combustion and circulating air blowers are
operating, and items 1 through 6 have been
checked without identifying the cause of the
problem, press the red reset buttons on the vent
safety and the roll out limit switches. (See
Figures 1, 2, 3 and 4).
IMPORTANT: If the furnace operates after
depressing the reset button on the vent limit
or roll out limit, it is an indication of a
potentiallyseriousproblemintheinstallation.
Contact a qualified serviceman to identify
and repair the problem.
MANUFACTURER WARRANTY, OWNER RESPONSIBILITIES
It is the sole responsibility of the homeowner to make certain the gas furnace has been correctly
set up and adjusted to operate properly.
The Manufacturer warrants the furnace to be free from defects in material or workmanship for the
warranty period. However, the Manufacturer will not be responsible for any costs found necessary
to correct problems due to improper set-up, improper installation, furnace adjustments, improper
operating procedure on the part of the user, etc.
Some specific examples of service calls which cannot be included in warranty payments are:
1. Repairing duct work in the home found to be faulty.
2. Correcting wiring problems in the electrical circuit supplying the furnace.
3. Re-setting circuit breakers or other switches.
4. Correction of problems due to improper gas supply pressure to the furnace.
5. Providing instructional training on how to light and operate the furnace.
6. Furnace problems caused by installation of an air conditioner, heat pump, or other air comfort
devices.
7. Revising installation of the vent assembly.
8. Adjusting or calibrating of the thermostat.
Carefully review these responsibilities with your dealer, service company, or gas supplier so there
will be no misunderstanding at a later time.
Read Your Warranty
Please read your limited warranty completely. It contains valuable information about your furnace.
If you have any questions about the warranty information, contact your distributor.
11
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7082220 (Replaces 7081670)
¢708222y¤
Specifications and illustrations subject to change
without notice and without incurring obligations.
Printed in U.S.A. (01/03)
7082220
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