American Standard Noncondensing Gas Furnaces Owner's manual

User’s Information Guide
Noncondensing Gas Furnaces
Upflow / Horizontal and Downflow / Horizontal
Pub. No. 32-5034-02
▲WARNING: DO NOT USE THIS UNIT IF
ANY PART HAS BEEN UNDER WATER. IMMEDIATELY
CALL A QUALIFIED SERVICE TECHNICIAN TO
INSPECT THE FURNACE AND TO REPLACE ANY
PART OF THE CONTROL SYSTEM AND ANY GAS
CONTROL WHICH HAS BEEN UNDER WATER.
▲WARNING: BODILY INJURY CAN RESULT FROM
HIGH VOLTAGE ELECTRICAL COMPONENTS, FAST MOVING FANS,
AND COMBUSTIBLE GAS. FOR PROTECTION FROM THESE
INHERENT HAZARDS DURING INSTALLATION AND SERVICING,
THE ELECTRICAL SUPPLY MUST BE DISCONNECTED AND THE
MAIN GAS VALVE MUST BE TURNED OFF. IF OPERATING CHECKS
MUST BE PERFORMED WITH THE UNIT OPERATING, IT IS THE
TECHNICIANS RESPONSIBILTY TO RECOGNIZE THESE HAZARDS
AND PROCEED SAFELY.
© American Standard Inc. 2001
WARNING: If the information in this manual
is not followed exactly, a fire or explosion may
result causing property damage, personal in-
jury or loss of life.
— Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your build-
ing.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fire department.
— Installation and service must be per-
formed by a qualified installer, service
agency or the gas supplier.
WARNING: Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.
32- 5034- 2

Page 2 Pub. No. 32-5034-02
GENERAL INFORMATION
WARNING: Improper installation, adjustment, al-
teration, service or maintenance can cause injury
or property damage. Refer to the installation in-
structions provided with the furnace and this
manual. For assistance or additional information
consult a qualified installer, service agency or the
gas supplier.
This information is intended for use by individuals pos-
sessing adequate backgrounds of electrical and mechani-
cal experience. Any attempt to repair a central air condi-
tioning product may result in personal injury and/or prop-
erty damage. American Standard Inc. or seller cannot be
responsible for the interpretation of this information, nor
can it assume any liability in connection with its use.
Safety signal words are used to designate a degree or
level of seriousness associated with a particular hazard.
The signal words for safety markings are DANGER,
WARNING, and CAUTION.
a. DANGER indicates an imminently hazardous
situation which, if not avoided, will result in death
or serious injury. This signal word is limited to the
most extreme situations.
b. WARNING indicates a potentially hazardous situa-
tion which, if not avoided, could result in death or
serious injury.
c. CAUTION indicates a potentially hazardous situa-
tion which, if not avoided, may result in minor or
moderate injury. It is also used to alert against
unsafe practices and hazards involving only prop-
erty damage.
There must be a free flow of fresh air sufficient for efficient
combustion and safe ventilation of your furnace. Do not
allow the louvers on the front panels of your furnace to
become blocked as this will restrict the flow of fresh air.
The combustion air for your furnace must be fresh uncon-
taminated air. Paints, varnishes, laundry bleaches, deter-
gents, many household cleaners, water softening salts,
adhesives, and all such products release fumes containing
compounds which could lead to early heat exchanger and
vent system deterioration. Do not store these type of
products near your furnace and consider fresh air for your
furnace during construction or remodeling.
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could
result in serious injury, death or property damage.
Improper servicing could result in dangerous opera-
tion, serious injury, death, or property damage.
WARNING:
These furnaces are not approved or intended for
installation in manufactured (mobile) housing, trailers,
or recreational vehicles. Failure to follow this warning
could result in property damage, personal injury, or
death.
CAUTION:
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dan-
gerous operation.
Verify proper operation after servicing.
Never store gasoline, combustible materials, or other
flammable liquids or vapors near your furnace.
If you have a problem, check the "Problem Solver" section
of this manual before you call for a possibly unneeded
service call.
Parts and controls of this furnace are unique. Should
service or modification be required, be sure your servicer
uses only factory authorized parts, kits, or accessories for
this furnace.
WARNING:
Do not touch igniter. It is extremely hot. Failure to
follow this warning could result in severe burns, other
injury, property damage, or death.
WARNING:
CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation and operation instruc-
tions for the venting system's operation could result in
carbon monoxide poisoning or death.

Pub. No. 32-5034-02 Page 3
Filter maintenance reduces energy use.
WARNING: Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.
A clean filter saves money.
When the furnace circulates and filters the air in your
home, dust and dirt particles build up on the filter.
Excessive accumulation can block the airflow, forcing
the unit to work harder to maintain desired tempera-
tures.
And the harder your unit has to work, the more energy
it uses. So you pay more any time your system is run-
ning with a dirty filter.
CAUTION: Never operate your unit for either
heating or cooling with filters removed.
Help ensure top efficiency by cleaning the filter once a
month. If you have an upflow furnace, you can wash or
change the filter once a month. Clean it twice a month
during seasons when the unit runs more often.
Your furnace came from the factory with a cleanable
filter. You can clean the filter with a vacuum, OR you
can wash it with a household detergent. Good quality,
high velocity filters may be used for replacements in
upflow furnaces.
With the new patented filter rack on the upflow models,
all cleaning or replacing of filters is quick and easy.
Clean filters guarantee optimum performance of your
system.
Replacing your filter.
When replacing your furnace filters, use a high velocity
type filter. On upflow furnaces, standard size 1" thick
high velocity filters will fit into the patented filter rack
which will automatically adjust in width to fit. Filters
are available from your dealer.
How to remove your filter.
WARNING: Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.
The upflow furnace blower door has a hinge at the
bottom which allows the door to tilt forward for filter
servicing or replacement without the door being re-
moved. The furnace filter in the bottom or side configu-
ration can be removed by simply turning the two latches
on the blower door 1/4 turn and tilting the door forward.
The blower door may be removed if necessary by tilting the
door outward 2 to 3 inches, then pulling up. The door will
slide out of the hinge for removal. For replacement, simply
insert the blower door bottom into the space between the
furnace base front and the hinge, then tilt inward and
latch.
Blower Door Hinge and Bottom Filter Rack Installation
Typical Upflow Right Side Return Filter Installation

Page 4 Pub. No. 32-5034-02
The filter rails are spring loaded for automatic adjustment
to allow standard size, locally obtainable replacement
filters. The filter rack itself slides to adjust to the required
width needed for bottom or side return. Always insert the
chamfer (angle edged sides) end first.
Filter Rack Assembly
CHAMFER
END OF
FILTER GOES
INTO FILTER
RACK FIRST
The furnace filter may be secured with filter retaining
brackets for right side return on smaller furnaces. To
replace filters on these furnaces, remove the blower
access door, push back to flex the filter and clear the
filter retaining bracket at the front of the unit. Gently
pull the filter out. After cleaning, replace the filter in
the same manner making sure that filter is secured in
place in both front and back filter retaining brackets of
the unit. Replace blower access door.
Air filters may also be located outside of the furnace
using a SIDE FILTER FRAME.
UPFLOW ONLY
Upflow / Horizontal Furnace Filters
The Upflow/Horizontal furnace, when installed horizon-
tally, requires a horizontal filter kit. The filters may be
located remote to the furnace or in the return air duct near
the furnace. Check with your dealer for the location
of your filters.
An upflow/horizontal furnace in horizontal return air filter
application, as shown, features two 14" x 20" x 1" filters in
the 14-1/2" wide furnace cabinets; or two 16" x 20" x 1"
filters in the 17-1/2", 21", and 24-1/2" wide furnace cabi-
nets.
To replace filters, remove the filter access door, lift the
filter from the lower bracket and shift the filter to the side
to free the top filter from the bracket and slide the filters
out through the filter access door. After cleaning, replace
the filters in the same manner making sure that the filters
are secured in place in both top and bottom filter brackets.
Replace filter access door.
Air filters may also be located outside of the furnace using
a remote filter grille. The filter grille could be in a hallway,
wall, or in the ceiling. Check with your dealer for the exact
location of your filter and the method of changing the
filters.
UPFLOW/HORIZONTAL WITH FILTER KIT

Pub. No. 32-5034-02 Page 5
Downflow Furnace Filters
Downflow/Horizontal furnaces use 2 standard size perma-
nent type air filters which may be located remote to the
furnace or in the return air duct. Check with your dealer
for the location of your filters.
A downflow/horizontal furnace vertical return air filter
application, as shown, features two 14" x 20" x 1" filter in
the 14-1/2" wide furnace cabinets; or two 16" x 20" x 1" filter
in the 17-1/2", 21", and 24-1/2" wide furnace cabinets.
A downflow/horizontal furnace with horizontal return air
filter application, as shown, features two 14" x 20" x 1"
filter in the 14-1/2" wide furnace cabinets; or two 16" x 20"
x 1" filter in the 17-1/2", 21", and 24-1/2" wide furnace
cabinets.
DOWNFLOW FILTER TABLE
REQUIRED FILTERS - DOWNFLOW
CABINET WIDTH FILTER QUANTITY & SIZE
14-1/2" 2 - 14" X 20" X 1"
17-1/2" 2 - 16" X 20" X 1"
21" 2 - 16" X 20" X 1"
24-1/2" 2 - 16" X 20" X 1"
FACTORY SUPPLIED UPFLOW FURNACE
RETURN AIR FILTERS
UPFLOW FURNACE RETURN AIR FILTERS
CABINET
WIDTH QTY* CABINET BOTTOM FILTER
CABINET
SIDE FILTER
14-1/2" 1 14" X 25" X 1" 17-1/2" X 25" X 1"
17-1/2" 1 17" X 25" X 1" 17-1/2" X 25" X 1"
21" 1 20" X 25" X 1" 17-1/2" X 25" X 1"
24-1/2" 1 24" X 25" X 1" 17-1/2" X 25" X 1"
*NOTE - On 5 or 6 ton airflow models, if the airflow
requirement exceeds 1800 CFM, these models will require
filters on
both sides; OR 1 side and the bottom; OR just the
bottom.
DOWNFLOW FILTER
DOWNFLOW/HORIZONTAL FILTER
WARNING: Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.

Page 6 Pub. No. 32-5034-02
The problem solver.
A furnace is not a household appliance. It is complex and
requires professional maintenance and repair.
That’s why attempts at “do-it-yourself” repairs on an in-
warranty unit may void the remainder of your warranty.
Other than performing the simple maintenance recom-
mended in this manual, you should not attempt to make
any adjustments to your furnace. Your dealer will be able
to take care of any questions or problems you may have. A
periodic inspection of your furnace should be made by a
qualified service agency at the start of each heating season.
Keep your furnace looking like new for years.
Clean the enamel finish of your furnace with ordinary soap
and water. For stubborn grease spots, use a household
detergent. Lacquer thinner or other synthetic solvents may
damage the finish.
Problem Possible Trouble Possible Remedy
No Heating - Blower 1. Thermostat set incorrectly. 1. Adjust thermostat See operating
Does not operate instructions
2. Blown fuse or tripped circuit breaker. 2. Replace or reset protective device
or call for servicer.
3. Defective component. 3. Most controls are automatic and will
recycle. If your unit still does not
operate call for servicer.
4. Burner does not ignite. 4. Call servicer.
5. Main gas line turned off. 5. Have gas company check.
6. Blower door removed or ajar. 6. Close door securely to restore power
to blower and gas valve.
7. Lockout 7. Turn power on-off-on-off twice
in 30 secs.
Insufficient Heating - 1. Dirty air filters. 1. Clean or replace filters.
Blower operates
continuously 2. Blocked supply or 2. Make sure registers are open and
return registers. No obstacles blocking off the air.
No Heat - Vent motor Restricted or plugged furnace 1. Remove drain clamps to condensate
is running condensate drain. trap and drain pan outlet
2. Flush or clear drain blockage.
3. Reinstall clamps.
Unusual Noise Call your servicer
Save time and money. Before calling for service, check the following:
CAUTION:
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dan-
gerous operation.
Verify proper operation after servicing.
WARNING:
Do not touch igniter. It is extremely hot. Failure to
follow this warning could result in severe burns, other
injury, property damage, or death.
WARNING:
CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation and operation instruc-
tions for the venting system's operation could result in
carbon monoxide poisoning or death.

Pub. No. 32-5034-02 Page 7
Maintenance information.
Never stop the cooling system by shutting off the
main power.
If the main power to your air conditioner is ever discon-
nected for more than three hours, turn off the thermostat.
Then wait for at least three more hours after the power has
been restored before turning the thermostat back on.
Failure to follow this procedure could result in damage to
your air conditioning system.
1. GENERAL INSPECTION - Examine the furnace instal-
lation for the following items:
a. All flue product carrying areas external to the fur-
nace (i.e. chimney, vent connector) are clear and free of
obstruction.
b. The vent connector is in place, slopes upward and is
physically sound without holes or excessive corrosion.
c. The return air duct connection(s) is physically sound,
is sealed to the furnace and terminates outside the
space containing the furnace.
d. The physical support of the furnace should be sound
without sagging, cracks, gaps, etc., around the base so
as to provide a seal between the support and the base.
e. There are no obvious signs of deterioration of the
furnace.
2. BLOWERS - The blower size and speed determine the
air volume delivered by the furnace. The blower motor
bearings are factory lubricated and under normal operat-
ing conditions usually do not require servicing. Annual
cleaning of the blower wheel and housing is recommended
for maximum air output, and this must be performed only
by a qualified servicer or service agency.
3. IGNITER - This unit has a special hot surface direct
ignition device that automatically lights the burners. Please
note that it is very fragile and should be handled with care.
CAUTION: Do not touch igniter. It is extremely hot.
4. BURNER - Gas burners do not normally require sched-
uled servicing, however, accumulation of foreign material
may cause a yellowing flame or delayed ignition. Either
condition indicates that a service call is required. For best
operation, burners must be cleaned annually using brushes
and vacuum cleaner.
Turn off gas and electric power supply. To clean burners,
remove top burner bracket and lift burner from orifice.
NOTE: Be careful not to break igniter when remov-
ing burners. Clean burners with brush and/or vacuum
cleaner. Reassemble parts by reversal of the above proce-
dure.
NOTE: On LP (propane) units, some light yellow tipping of
the outer mantle is normal. Inner mantle should be bright
blue.
Natural gas units should not have any yellow tipped
flames. This condition indicates that a service call is
required. For best operation, burners must be cleaned
annually using brushes and vacuum cleaner.
NOTE: On LP (propane) units, due to variations in BTU
content and altitude, servicing may be required at shorter
intervals.
5. HEAT EXCHANGER / FLUE PIPE - These items must
be inspected for signs of corrosion, and/or deterioration at
the beginning of each heating season by a qualified service
technician and cleaned annually for best operation.
6. CIRCUIT PROTECTION - If blower or gas valve fail to
operate, the cause could be the circuit breaker or a loose or
blown fuse. Replace fuse or reset circuit breaker.
7. OPERATION - Your warm air furnace should not be
operated in a corrosive atmosphere. Paint solvents, clean-
ing chemicals, spray propellants, and bleaches should not
be used in the vicinity of the furnace during normal
operation.
8. COOLING COIL CONDENSATE DRAIN - If you have
a cooling coil installed with your furnace, condensate
drains should be checked and cleaned periodically to as-
sure that condensate can drain freely from coil to drain. If
condensate cannot drain freely water damage could occur.
9. AIR CIRCULATION - To ensure increased comfort,
blower on this unit may be operated continuously for both
heating and cooling. This will result in constantly filtered
air and aid in maintaining more even temperatures by
avoiding temperature stratification throughout the condi-
tioned area. To accomplish constant air circulation, set
your thermostat fan switch to "ON".
WARNING:
Do not touch igniter. It is extremely hot. Failure to
follow this warning could result in severe burns.

Page 8 Pub. No. 32-5034-02
For your safety.
Furnace area must be kept clear and free of combustible
materials, gasoline, and other flammable vapors and liq-
uids.
Air for combustion and ventilation.
The flow of combustion and ventilating air must not be
obstructed from reaching the furnace. Air openings pro-
vided in the casing of furnace must be kept free of obstruc-
tions which would restrict airflow, thereby affecting effi-
ciency and safe operation of your furnace.
Also, air openings provided to the area in which the
furnace is installed and the space around the furnace shall
not be blocked or obstructed. Keep this in mind should you
choose to remodel the area which contains your furnace.
Furnaces must have air for proper performance.
If additional insulation is added after the furnace is in-
stalled, the area around the furnace must be inspected to
ensure it is free and clear of insulation. If this furnace is
installed in an attic or other insulated space it must be kept
free and clear of all insulating materials as some insulat-
ing materials are combustible.
Manual Main Gas Shut-off Valve May Be
Located on the Left or Right Side
Manual Main Gas Shut-off Valve May Be Located on the Top or Bottom Side
NOTE THE LOCATION OF THE MANUAL MAIN GAS SHUTOFF VALVE FOR YOUR FUR-
NACE.
Have your installer or servicer show you the location if you have any questions.
▲WARNING: DO NOT USE THIS UNIT IF
ANY PART HAS BEEN UNDER WATER. IMMEDIATELY
CALL A QUALIFIED SERVICE TECHNICIAN TO
INSPECT THE FURNACE AND TO REPLACE ANY
PART OF THE CONTROL SYSTEM AND ANY GAS
CONTROL WHICH HAS BEEN UNDER WATER.
WARNING: Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.

Pub. No. 32-5034-02 Page 9
5. Turn gas cock knob counterclockwise to “ON” marker.
6. Replace control access panel.
7. Turn on main electrical supply and set thermostat to desired
setting. Combustion blower will start and ignition device will
start to heat up. After approximately 15 seconds main gas valve
will open and burners will ignite.
8. When thermostat is satisfied, main burners will extinguish.
9. If main burners fail to ignite, lower thermostat setting or
disconnect electrical supply, wait 5 minutes, raise thermostat
setting above indicated temperature.
10. If furnace will not light, turn “OFF” all gas and electricity to
unit and call servicer or gas supplier.
For complete shutdown.
Turn gas cock knob on main gas valve to “OFF” position. Discon-
nect electrical supply to unit.
CAUTION: If this is done during the cold weather months,
provisions must be taken to prevent freeze-up of all water pipes
and water receptacles.
Whenever your house is to be vacant, arrange to have someone
inspect your house for proper temperature. If your furnace
should fail to operate, damage could result, such as frozen water
pipes.
Safety cutoff device (thermal limit).
All models are equipped with a fusible link behind gas valve.
In case of main gas valve malfunction and consequent
overheating, link will open and close off flow of all gas. See
instruction label on front panel of heat exchanger.
Lighting instructions.
Your furnace is equipped with a hot surface direct ignition
device.
WARNING.
Do not attempt to manually light the furnace.
1. Please read all safety information in this book before operating
furnace.
2. Set thermostat to lowest setting. Turn off all electric power to
furnace.
3. Remove control access panel.
4. Turn gas cock knob on main gas valve with unit clockwise to
“OFF” position. If external gas cock is used, turn to “OFF”
position. Allow 5 minutes for any gas within the unit to escape.
LP gas being heavier than air may require forced ventilation. If
you smell gas STOP! Follow the “What To Do If You Smell Gas”
instructions on the front cover of this book. If you don’t smell gas,
go to next step.
To light furnace.
Your furnace may have a "Knob Switch" or a "Toggle Switch" to turn the gas ON or OFF.
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 com-
mercially 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.

Page 10 Pub. No. 32-5034-02
Warranty Information
It’s always a good idea to keep records which will save you time
and money. If it’s necessary to have your FURNACE repaired,
the service man will want to know if your unit is still under
Warranty. To save time, take a few minutes to record the
following information here:
Model Number:_____________________________________
Serial Number: _____________________________________
Date of Purchase:___________________________________
Service Information
Call your installing dealer if the unit is inoperative. Before
you call, always check the following to be sure service is
really required:
a. Be sure the main switch that supplies power to the unit is
in the “ON” position.
b. Replace any burned-out fuses or reset circuit breakers.
c. Be sure the thermostat is properly set.
Extended warranties are available from the manufacturer through your dealer. The limited warranty is backed by the
manufacturer and any representations made about extending the limited warranty would be backed by the manufacturer if and
only if an extended warranty agreement was received from the manufacturer.
Limited Warranty
High Efficiency Induced Draft Gas Furnace
UE, DE, UD-R, DD-R, UD-RV, DD-RV,
UD-C, DD-C, CUB and CDB
Models Less Than 20 Tons for Residential Use*
(Parts Only)
This limited warranty is extended by American Standard Inc., to the original purchaser and to any succeeding
owner of the real property to which the Gas Furnace is originally affixed, and applies to products purchased and
retained for use within the U.S.A. and Canada.
If any part of your Gas Furnace fails because of a manufacturing defect within five years from the date of the
original purchase, Warrantor will furnish without charge the required replacement part. Any local transportation,
related service labor, air filters, and diagnosis calls, are not included.
In addition, if the steel heat exchanger fails because of a manufacturing defect within the sixth through twentieth
year from the date of original purchase, Warrantor will furnish without charge a replacement heat exchanger. Any
local transportation, related service labor, air filters, and diagnosis calls, are not included.
This limited warranty does not cover failure of your gas furnace if it is damaged while in your possession, failure
attributable or caused by unreasonable use of the gas furnace and/or failure to properly maintain the gas furnace
as set forth in the Use and Care manual.
This limited warranty applies to product installed on or after 10/1/2001 where product is manufactured after
1/1/2000. This limited warranty is not retroactive to any installations prior to 10/1/2001 or on product produced
prior to 2000.
THE LIMITED WARRANTY AND LIABILITY SET FORTH HEREIN ARE IN LIEU OF ALL OTHER
WARRANTIES AND LIABILITIES, WHETHER IN CONTRACT OR IN NEGLIGENCE, EXPRESS OR
IMPLIED, IN LAW OR IN FACT, INCLUDING IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR PARTICULAR USE, AND IN NO EVENT SHALL WARRANTOR BE LIABLE FOR ANY
INCIDENTAL OR CONSEQUENTIAL DAMAGES.
Some states do not allow limitations on how long an implied limited warranty lasts or do not allow the exclusion
or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you.
This limited warranty gives you specific legal rights, and you may also have other rights which vary from state to
state.
Parts will be provided by our factory organization through an authorized service organization in your area listed
in the yellow pages. If you wish further help or information concerning this limited warranty, contact:
American Standard Inc.
Troup Highway
Tyler, TX 75711-9010
Attention: Manager, After Sales Support
GW-615-4001
* This limited warranty is for residential usage of this equipment and not applicable when this equipment is used
for a commercial application. A commercial use is any application where the end purchaser uses the product for
other than personal, family or household purposes.

Pub. No. 32-5034-02 Page 11
The following warning complies with State of California law, Proposition 65.
WARNING: This product contains fiberglass wool insulation! Fiberglass dust and ceramic fibers are be-
lieved by the state of California to cause cancer through inhalation. Glasswool fibers may also cause respiratory, skin,
or eye irritation.
PRECAUTIONARY MEASURES
•Avoid breathing fiberglass dust.
•Use a NIOSH approved dust/mist respirator.
•Avoid contact with the skin or eyes. Wear long-sleeved,
loose fitting clothing, gloves, and eye protection.
•Wash clothes separately from other clothing; rinse washer
thoroughly.
•Operations such as sawing, blowing, tear-out, and spray-
ing may generate fiber concentrations requiring additional
respiratory protection. Use the appropriate NIOSH ap-
proved respirator in these situations.
FIRST AID MEASURES
Eye Contact - Flush eyes with water to remove dust. If
symptoms persist, seek medical atten-
tion.
Skin Contact - Wash affected areas gently with soap
and warm water after handling.

Page 12 Pub. No. 32-5034-02
American Standard Inc.
6200 Troup Highway
Tyler, TX 75711-9010 Since the manufacturer has a policy of continuous product and product data improvement, it reserves the right
to change design and specifications without notice.

User’s Information Guide
Noncondensing Gas Furnaces
Upflow / Horizontal and Downflow / Horizontal
Pub. No. 32-5034-02
▲WARNING: DO NOT USE THIS UNIT IF
ANY PART HAS BEEN UNDER WATER. IMMEDIATELY
CALL A QUALIFIED SERVICE TECHNICIAN TO
INSPECT THE FURNACE AND TO REPLACE ANY
PART OF THE CONTROL SYSTEM AND ANY GAS
CONTROL WHICH HAS BEEN UNDER WATER.
▲WARNING: BODILY INJURY CAN RESULT FROM
HIGH VOLTAGE ELECTRICAL COMPONENTS, FAST MOVING FANS,
AND COMBUSTIBLE GAS. FOR PROTECTION FROM THESE
INHERENT HAZARDS DURING INSTALLATION AND SERVICING,
THE ELECTRICAL SUPPLY MUST BE DISCONNECTED AND THE
MAIN GAS VALVE MUST BE TURNED OFF. IF OPERATING CHECKS
MUST BE PERFORMED WITH THE UNIT OPERATING, IT IS THE
TECHNICIANS RESPONSIBILTY TO RECOGNIZE THESE HAZARDS
AND PROCEED SAFELY.
© American Standard Inc. 2001
WARNING: If the information in this manual
is not followed exactly, a fire or explosion may
result causing property damage, personal in-
jury or loss of life.
— Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch;
do not use any phone in your build-
ing.
• Immediately call your gas supplier
from a neighbor’s phone. Follow the
gas supplier’s instructions.
• If you cannot reach your gas sup-
plier, call the fire department.
— Installation and service must be per-
formed by a qualified installer, service
agency or the gas supplier.
WARNING: Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.
32- 5034- 2

Page 2 Pub. No. 32-5034-02
GENERAL INFORMATION
WARNING: Improper installation, adjustment, al-
teration, service or maintenance can cause injury
or property damage. Refer to the installation in-
structions provided with the furnace and this
manual. For assistance or additional information
consult a qualified installer, service agency or the
gas supplier.
This information is intended for use by individuals pos-
sessing adequate backgrounds of electrical and mechani-
cal experience. Any attempt to repair a central air condi-
tioning product may result in personal injury and/or prop-
erty damage. American Standard Inc. or seller cannot be
responsible for the interpretation of this information, nor
can it assume any liability in connection with its use.
Safety signal words are used to designate a degree or
level of seriousness associated with a particular hazard.
The signal words for safety markings are DANGER,
WARNING, and CAUTION.
a. DANGER indicates an imminently hazardous
situation which, if not avoided, will result in death
or serious injury. This signal word is limited to the
most extreme situations.
b. WARNING indicates a potentially hazardous situa-
tion which, if not avoided, could result in death or
serious injury.
c. CAUTION indicates a potentially hazardous situa-
tion which, if not avoided, may result in minor or
moderate injury. It is also used to alert against
unsafe practices and hazards involving only prop-
erty damage.
There must be a free flow of fresh air sufficient for efficient
combustion and safe ventilation of your furnace. Do not
allow the louvers on the front panels of your furnace to
become blocked as this will restrict the flow of fresh air.
The combustion air for your furnace must be fresh uncon-
taminated air. Paints, varnishes, laundry bleaches, deter-
gents, many household cleaners, water softening salts,
adhesives, and all such products release fumes containing
compounds which could lead to early heat exchanger and
vent system deterioration. Do not store these type of
products near your furnace and consider fresh air for your
furnace during construction or remodeling.
WARNING:
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could
result in serious injury, death or property damage.
Improper servicing could result in dangerous opera-
tion, serious injury, death, or property damage.
WARNING:
These furnaces are not approved or intended for
installation in manufactured (mobile) housing, trailers,
or recreational vehicles. Failure to follow this warning
could result in property damage, personal injury, or
death.
CAUTION:
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dan-
gerous operation.
Verify proper operation after servicing.
Never store gasoline, combustible materials, or other
flammable liquids or vapors near your furnace.
If you have a problem, check the "Problem Solver" section
of this manual before you call for a possibly unneeded
service call.
Parts and controls of this furnace are unique. Should
service or modification be required, be sure your servicer
uses only factory authorized parts, kits, or accessories for
this furnace.
WARNING:
Do not touch igniter. It is extremely hot. Failure to
follow this warning could result in severe burns, other
injury, property damage, or death.
WARNING:
CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation and operation instruc-
tions for the venting system's operation could result in
carbon monoxide poisoning or death.

Pub. No. 32-5034-02 Page 3
Filter maintenance reduces energy use.
WARNING: Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.
A clean filter saves money.
When the furnace circulates and filters the air in your
home, dust and dirt particles build up on the filter.
Excessive accumulation can block the airflow, forcing
the unit to work harder to maintain desired tempera-
tures.
And the harder your unit has to work, the more energy
it uses. So you pay more any time your system is run-
ning with a dirty filter.
CAUTION: Never operate your unit for either
heating or cooling with filters removed.
Help ensure top efficiency by cleaning the filter once a
month. If you have an upflow furnace, you can wash or
change the filter once a month. Clean it twice a month
during seasons when the unit runs more often.
Your furnace came from the factory with a cleanable
filter. You can clean the filter with a vacuum, OR you
can wash it with a household detergent. Good quality,
high velocity filters may be used for replacements in
upflow furnaces.
With the new patented filter rack on the upflow models,
all cleaning or replacing of filters is quick and easy.
Clean filters guarantee optimum performance of your
system.
Replacing your filter.
When replacing your furnace filters, use a high velocity
type filter. On upflow furnaces, standard size 1" thick
high velocity filters will fit into the patented filter rack
which will automatically adjust in width to fit. Filters
are available from your dealer.
How to remove your filter.
WARNING: Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.
The upflow furnace blower door has a hinge at the
bottom which allows the door to tilt forward for filter
servicing or replacement without the door being re-
moved. The furnace filter in the bottom or side configu-
ration can be removed by simply turning the two latches
on the blower door 1/4 turn and tilting the door forward.
The blower door may be removed if necessary by tilting the
door outward 2 to 3 inches, then pulling up. The door will
slide out of the hinge for removal. For replacement, simply
insert the blower door bottom into the space between the
furnace base front and the hinge, then tilt inward and
latch.
Blower Door Hinge and Bottom Filter Rack Installation
Typical Upflow Right Side Return Filter Installation

Page 4 Pub. No. 32-5034-02
The filter rails are spring loaded for automatic adjustment
to allow standard size, locally obtainable replacement
filters. The filter rack itself slides to adjust to the required
width needed for bottom or side return. Always insert the
chamfer (angle edged sides) end first.
Filter Rack Assembly
CHAMFER
END OF
FILTER GOES
INTO FILTER
RACK FIRST
The furnace filter may be secured with filter retaining
brackets for right side return on smaller furnaces. To
replace filters on these furnaces, remove the blower
access door, push back to flex the filter and clear the
filter retaining bracket at the front of the unit. Gently
pull the filter out. After cleaning, replace the filter in
the same manner making sure that filter is secured in
place in both front and back filter retaining brackets of
the unit. Replace blower access door.
Air filters may also be located outside of the furnace
using a SIDE FILTER FRAME.
UPFLOW ONLY
Upflow / Horizontal Furnace Filters
The Upflow/Horizontal furnace, when installed horizon-
tally, requires a horizontal filter kit. The filters may be
located remote to the furnace or in the return air duct near
the furnace. Check with your dealer for the location
of your filters.
An upflow/horizontal furnace in horizontal return air filter
application, as shown, features two 14" x 20" x 1" filters in
the 14-1/2" wide furnace cabinets; or two 16" x 20" x 1"
filters in the 17-1/2", 21", and 24-1/2" wide furnace cabi-
nets.
To replace filters, remove the filter access door, lift the
filter from the lower bracket and shift the filter to the side
to free the top filter from the bracket and slide the filters
out through the filter access door. After cleaning, replace
the filters in the same manner making sure that the filters
are secured in place in both top and bottom filter brackets.
Replace filter access door.
Air filters may also be located outside of the furnace using
a remote filter grille. The filter grille could be in a hallway,
wall, or in the ceiling. Check with your dealer for the exact
location of your filter and the method of changing the
filters.
UPFLOW/HORIZONTAL WITH FILTER KIT

Pub. No. 32-5034-02 Page 5
Downflow Furnace Filters
Downflow/Horizontal furnaces use 2 standard size perma-
nent type air filters which may be located remote to the
furnace or in the return air duct. Check with your dealer
for the location of your filters.
A downflow/horizontal furnace vertical return air filter
application, as shown, features two 14" x 20" x 1" filter in
the 14-1/2" wide furnace cabinets; or two 16" x 20" x 1" filter
in the 17-1/2", 21", and 24-1/2" wide furnace cabinets.
A downflow/horizontal furnace with horizontal return air
filter application, as shown, features two 14" x 20" x 1"
filter in the 14-1/2" wide furnace cabinets; or two 16" x 20"
x 1" filter in the 17-1/2", 21", and 24-1/2" wide furnace
cabinets.
DOWNFLOW FILTER TABLE
REQUIRED FILTERS - DOWNFLOW
CABINET WIDTH FILTER QUANTITY & SIZE
14-1/2" 2 - 14" X 20" X 1"
17-1/2" 2 - 16" X 20" X 1"
21" 2 - 16" X 20" X 1"
24-1/2" 2 - 16" X 20" X 1"
FACTORY SUPPLIED UPFLOW FURNACE
RETURN AIR FILTERS
UPFLOW FURNACE RETURN AIR FILTERS
CABINET
WIDTH QTY* CABINET BOTTOM FILTER
CABINET
SIDE FILTER
14-1/2" 1 14" X 25" X 1" 17-1/2" X 25" X 1"
17-1/2" 1 17" X 25" X 1" 17-1/2" X 25" X 1"
21" 1 20" X 25" X 1" 17-1/2" X 25" X 1"
24-1/2" 1 24" X 25" X 1" 17-1/2" X 25" X 1"
*NOTE - On 5 or 6 ton airflow models, if the airflow
requirement exceeds 1800 CFM, these models will require
filters on
both sides; OR 1 side and the bottom; OR just the
bottom.
DOWNFLOW FILTER
DOWNFLOW/HORIZONTAL FILTER
WARNING: Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.

Page 6 Pub. No. 32-5034-02
The problem solver.
A furnace is not a household appliance. It is complex and
requires professional maintenance and repair.
That’s why attempts at “do-it-yourself” repairs on an in-
warranty unit may void the remainder of your warranty.
Other than performing the simple maintenance recom-
mended in this manual, you should not attempt to make
any adjustments to your furnace. Your dealer will be able
to take care of any questions or problems you may have. A
periodic inspection of your furnace should be made by a
qualified service agency at the start of each heating season.
Keep your furnace looking like new for years.
Clean the enamel finish of your furnace with ordinary soap
and water. For stubborn grease spots, use a household
detergent. Lacquer thinner or other synthetic solvents may
damage the finish.
Problem Possible Trouble Possible Remedy
No Heating - Blower 1. Thermostat set incorrectly. 1. Adjust thermostat See operating
Does not operate instructions
2. Blown fuse or tripped circuit breaker. 2. Replace or reset protective device
or call for servicer.
3. Defective component. 3. Most controls are automatic and will
recycle. If your unit still does not
operate call for servicer.
4. Burner does not ignite. 4. Call servicer.
5. Main gas line turned off. 5. Have gas company check.
6. Blower door removed or ajar. 6. Close door securely to restore power
to blower and gas valve.
7. Lockout 7. Turn power on-off-on-off twice
in 30 secs.
Insufficient Heating - 1. Dirty air filters. 1. Clean or replace filters.
Blower operates
continuously 2. Blocked supply or 2. Make sure registers are open and
return registers. No obstacles blocking off the air.
No Heat - Vent motor Restricted or plugged furnace 1. Remove drain clamps to condensate
is running condensate drain. trap and drain pan outlet
2. Flush or clear drain blockage.
3. Reinstall clamps.
Unusual Noise Call your servicer
Save time and money. Before calling for service, check the following:
CAUTION:
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dan-
gerous operation.
Verify proper operation after servicing.
WARNING:
Do not touch igniter. It is extremely hot. Failure to
follow this warning could result in severe burns, other
injury, property damage, or death.
WARNING:
CARBON MONOXIDE POISONING HAZARD
Failure to follow the installation and operation instruc-
tions for the venting system's operation could result in
carbon monoxide poisoning or death.

Pub. No. 32-5034-02 Page 7
Maintenance information.
Never stop the cooling system by shutting off the
main power.
If the main power to your air conditioner is ever discon-
nected for more than three hours, turn off the thermostat.
Then wait for at least three more hours after the power has
been restored before turning the thermostat back on.
Failure to follow this procedure could result in damage to
your air conditioning system.
1. GENERAL INSPECTION - Examine the furnace instal-
lation for the following items:
a. All flue product carrying areas external to the fur-
nace (i.e. chimney, vent connector) are clear and free of
obstruction.
b. The vent connector is in place, slopes upward and is
physically sound without holes or excessive corrosion.
c. The return air duct connection(s) is physically sound,
is sealed to the furnace and terminates outside the
space containing the furnace.
d. The physical support of the furnace should be sound
without sagging, cracks, gaps, etc., around the base so
as to provide a seal between the support and the base.
e. There are no obvious signs of deterioration of the
furnace.
2. BLOWERS - The blower size and speed determine the
air volume delivered by the furnace. The blower motor
bearings are factory lubricated and under normal operat-
ing conditions usually do not require servicing. Annual
cleaning of the blower wheel and housing is recommended
for maximum air output, and this must be performed only
by a qualified servicer or service agency.
3. IGNITER - This unit has a special hot surface direct
ignition device that automatically lights the burners. Please
note that it is very fragile and should be handled with care.
CAUTION: Do not touch igniter. It is extremely hot.
4. BURNER - Gas burners do not normally require sched-
uled servicing, however, accumulation of foreign material
may cause a yellowing flame or delayed ignition. Either
condition indicates that a service call is required. For best
operation, burners must be cleaned annually using brushes
and vacuum cleaner.
Turn off gas and electric power supply. To clean burners,
remove top burner bracket and lift burner from orifice.
NOTE: Be careful not to break igniter when remov-
ing burners. Clean burners with brush and/or vacuum
cleaner. Reassemble parts by reversal of the above proce-
dure.
NOTE: On LP (propane) units, some light yellow tipping of
the outer mantle is normal. Inner mantle should be bright
blue.
Natural gas units should not have any yellow tipped
flames. This condition indicates that a service call is
required. For best operation, burners must be cleaned
annually using brushes and vacuum cleaner.
NOTE: On LP (propane) units, due to variations in BTU
content and altitude, servicing may be required at shorter
intervals.
5. HEAT EXCHANGER / FLUE PIPE - These items must
be inspected for signs of corrosion, and/or deterioration at
the beginning of each heating season by a qualified service
technician and cleaned annually for best operation.
6. CIRCUIT PROTECTION - If blower or gas valve fail to
operate, the cause could be the circuit breaker or a loose or
blown fuse. Replace fuse or reset circuit breaker.
7. OPERATION - Your warm air furnace should not be
operated in a corrosive atmosphere. Paint solvents, clean-
ing chemicals, spray propellants, and bleaches should not
be used in the vicinity of the furnace during normal
operation.
8. COOLING COIL CONDENSATE DRAIN - If you have
a cooling coil installed with your furnace, condensate
drains should be checked and cleaned periodically to as-
sure that condensate can drain freely from coil to drain. If
condensate cannot drain freely water damage could occur.
9. AIR CIRCULATION - To ensure increased comfort,
blower on this unit may be operated continuously for both
heating and cooling. This will result in constantly filtered
air and aid in maintaining more even temperatures by
avoiding temperature stratification throughout the condi-
tioned area. To accomplish constant air circulation, set
your thermostat fan switch to "ON".
WARNING:
Do not touch igniter. It is extremely hot. Failure to
follow this warning could result in severe burns.

Page 8 Pub. No. 32-5034-02
For your safety.
Furnace area must be kept clear and free of combustible
materials, gasoline, and other flammable vapors and liq-
uids.
Air for combustion and ventilation.
The flow of combustion and ventilating air must not be
obstructed from reaching the furnace. Air openings pro-
vided in the casing of furnace must be kept free of obstruc-
tions which would restrict airflow, thereby affecting effi-
ciency and safe operation of your furnace.
Also, air openings provided to the area in which the
furnace is installed and the space around the furnace shall
not be blocked or obstructed. Keep this in mind should you
choose to remodel the area which contains your furnace.
Furnaces must have air for proper performance.
If additional insulation is added after the furnace is in-
stalled, the area around the furnace must be inspected to
ensure it is free and clear of insulation. If this furnace is
installed in an attic or other insulated space it must be kept
free and clear of all insulating materials as some insulat-
ing materials are combustible.
Manual Main Gas Shut-off Valve May Be
Located on the Left or Right Side
Manual Main Gas Shut-off Valve May Be Located on the Top or Bottom Side
NOTE THE LOCATION OF THE MANUAL MAIN GAS SHUTOFF VALVE FOR YOUR FUR-
NACE.
Have your installer or servicer show you the location if you have any questions.
▲WARNING: DO NOT USE THIS UNIT IF
ANY PART HAS BEEN UNDER WATER. IMMEDIATELY
CALL A QUALIFIED SERVICE TECHNICIAN TO
INSPECT THE FURNACE AND TO REPLACE ANY
PART OF THE CONTROL SYSTEM AND ANY GAS
CONTROL WHICH HAS BEEN UNDER WATER.
WARNING: Disconnect power to the
unit before removing the blower door. Failure to
follow this warning could result in property damage,
personal injury or death.