International Comfort Products N8MSL0451408, N8MSL0451412, N8MSL0701408, N8MSL0701412, N8MSL0701716 Installation Manual
...
INSTALLATION INSTRUCTIONS
80% Single Stage, PSC Motor
Category I, Gas Furnace
N8MSN, N8MSL
These instructions must be read and understood completely before attempting installation.
Safety Labeling and Signal Words
DANGER, WARNING, CAUTION, and NOTE Signal Words in Manuals
The signal words DANGER, WARNING, CAUTION, and NOTE
are used to identify levels of hazard seriousness. The signal word
DANGER is only used on product labels to signify an immediate
hazard. The signal words WARNING, CAUTION, and NOTE will
be used on product labels and throughout this manual and other
manual that may apply to the product.
DANGER − Immediate hazards which will result in severe person-
al injury or death.
WARNING − Hazards or unsafe practices which could result in
severe personal injury or death.
CAUTION − Hazards or unsafe practices which may result in
minor personal injury or product or property damage.
NOTE − Used to highlight suggestions which will result in en-
hanced installation, reliability, or operation.
The signal word WARNING is used throughout this manual in the
following manner:
!
WARNING
The signal word CAUTION is used throughout this manual in the
following manner:
!
CAUTION
Signal Words on Product Labeling
Signal words are used in combination with colors and/or pictures
or product labels.
Safety−alert symbol
When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury.
TABLE OF CONTENTS
DIMENSIONS 3...............................................
SAFETY CONSIDERATIONS 3..................................
INTRODUCTION 4............................................
CODES AND STANDARDS 5...................................
SAFETY 5................................................
GENERAL INSTALLATION 5................................
COMBUSTION AND VENTILATION AIR 5.....................
DUCT SYSTEMS 5........................................
ACOUSTICAL LINING AND FIBROUS GLASS DUCT 5.........
GAS PIPING AND GAS PIPE PRESSURE TESTING 5..........
ELECTRICAL CONNECTIONS 5............................
VENTING 5..............................................
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS 5...........
LOCATION 6.................................................
AIR FOR COMBUSTION AND VENTILATION 7....................
INSTALLATION 10..............................................
UPFLOW INSTALLATION 10.................................
DOWNFLOW INSTALLATION 11.............................
FILTER ARRANGEMENT 12.................................
AIR DUCTS 13.............................................
AIR DELIVERY − CFM 14....................................
ELECTRICAL CONNECTIONS 20............................
115 −V WIRING 20..........................................
J−BOX RELOCATION 20....................................
ELECTRICAL CONNECTION TO J−BOX 20....................
ELECTRICAL DATA 21......................................
24−V WIRING 22...........................................
ACCESSORIES 22.........................................
VENTING 23..................................................
GENERAL VENTING REQUIREMENTS 23.....................
MASONRY CHIMNEY REQUIREMENTS 24....................
APPLIANCE APPLICATION REQUIREMENTS 26...............
ADDITIONAL VENTING REQUIREMENTS 26..................
SIDEWALL VENTING 27....................................
START−UP, ADJUSTMENT, AND SAFETY CHECK 30...............
GENERAL 30..............................................
START−UP PROCEDURES 30...............................
ADJUSTMENTS 31.........................................
SPEED SELECTION 32.....................................
CHECK SAFETY CONTROLS 33.............................
CHECKLIST 34............................................
ORIFICE SIZE AND MANIFOLD PRESSURE 35................
SERVICE AND MAINTENANCE PROCEDURES 39.................
CARE AND MAINTENANCE 39...................................
SEQUENCE OF OPERATION 43.................................
WIRING DIAGRAM 44..........................................
TROUBLESHOOTING GUIDE 45.................................
Use of the AHRI Certified TM Mark indicates
a manufacturer’s participation in the program.
For verification of certification for individual
products, go to www.ahridirectory.org .
!
WARNING
PERSONAL INJURY, AND/OR PROPERTY
DAMAGE HAZARD
Failure to carefully read and follow this warning could
result in equipment malfunction, property damage,
personal injury and/or death.
Installation or repairs made by unqualified persons
could result in equipment malfunction, property
damage, personal injury and/or death.
The information contained in this manual is intended for
use by a qualified service technician familiar with safety
procedures and equipped with proper tools and test
instruments.
Installation must conform with local building codes and
with the Natural Fuel Gas Code (NFCG) NFPA
54/ANSI Z223.1, and National standards of Canada
CAN/CSA−B149.1 and .2 Natural Gas and Propane
Installation Codes.
INSTALLER: Affix these instructions on or adjacent to the furnace.
CONSUMER: Retain these instructions for future reference.
Portions of the text and tables are reprinted from NFPA 54 /ANSI Z223.1−2009©, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washing-
ton, DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSI, on the referenced subject, which is represented only by the standard in its entirety.
Printed in U.S.A. 441 01 1402 00 Jan. 2011
Figure 1 - Dimensional Drawing
NOTES:
1. Two additional 7/8-in. (22 mm) diameter holes are located in the top plate.
2. Minimum return-air openings at furnace, based on metal duct. If flex duct is used, see flex duct manufacturer's recommendations for equivalent diameters.
a. For 800 CFM-16-in. (406 mm) round or 14 1/2 x 12-in. (368 x 305 mm) rectangle.
b. For 1200 CFM-20-in. (508 mm) round or 14 1/2 x 19 1/2-in. (368 x 495 mm) rectangle.
c. For 1600 CFM-22-in. (559 mm) round or 14 1/2 x 22 1/16-in. (368 x 560mm) rectangle.
d. For airflow requirements above 1800 CFM, see Air Delivery table in Product Data literature for specific use of single side inlets. The use of both side inlets, a
combination of 1 side and the bottom, or the bottom only will ensure adequate return air openings for airflow requirements above 1800 CFM.
2
441 01 1402 00
Table 1—Dimensions − In. (mm)
A B C D
OUTLET
FURNACE SIZE
N8MSN & N8MSL
0451408 14−3/16 (360) 12−9/16 (319) 9−5/16 (237) 12−11/16 (322) 4 (102) 104 (47)
0451412 14−3/16 (360) 12−9/16 (319) 9−5/16 (237) 12−11/16 (322) 4 (102) 107 (49)
0701408 14−3/16 (360) 12−9/16 (319) 9−5/16 (237) 12−11/16 (322) 4 (102) 111 (50)
0701412 14−3/16 (360) 12−9/16 (319) 9−5/16 (237) 12−11/16 (322) 4 (102) 115 (52)
0701716 17−1/2 (445) 15−7/8 (403) 11−9/16 (294) 16 (406) 4 (102) 126 (57)
0901714 17−1/2 (445) 15−7/8 (403) 11−9/16 (294) 16 (406) 4 (102) 127 (58)
0902116 21 (533) 19−3/8 (492) 13−5/16 (338) 19−1/2 (495) 4 (102) 140 (64)
0902120 21 (533) 19−3/8 (492) 13−5/16 (338) 19−1/2 (495) 4 (102) 146 (66)
1101712 17−1/2 (445) 15−7/8 (403) 11−9/16 (294) 16 (406) 4 (102) 135 (61)
1102116 21 (533) 19−3/8 (492) 13−5/16 (338) 19−1/2 (495) 4 (102) 146 (66)
1102122 21 (533) 19−3/8 (492) 13−5/16 (338) 19−1/2 (495) 4 (102) 152 (69)
1352116 21 (533) 19−3/8 (492) 13−5/16 (338) 19−1/2 (495) 4 (102)* 149 (68)
1352422 24−1/2 (622) 22−7/8 (581) 15−1/16 (383) 23 (584) 4 (102)* 163 (74)
1552420 24−1/2 (622) 22−7/8 (581) 15−1/16 (383) 23 (584) 4 (102)* 170 (77)
*135 and 155 size furnaces require a 5 or 6-in. (127 or 152 mm) vent. Use a vent adapter between furnace and vent stack. See Installation Instructions for complete
installation requirements.
CABINET WIDTH
IN (mm)
WIDTH
IN (mm)
SAFETY CONSIDERATIONS
!
FIRE, EXPLOSION, ELECTRICAL SHOCK, AND
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
Improper installation, adjustment, alteration, service,
maintenance, or use can cause carbon monoxide
poisoning, explosion, fire, electrical shock, or other
conditions which may cause personal injury or
property damage. Consult a qualified service agency,
local gas supplier, or your distributor or branch for
information or assistance. The qualified service
agency must use only factory−authorized and listed
kits or accessories when modifying this product.
FURNACE RELIABILITY HAZARD
Failure to follow this caution may result in unit
component damage.
Application of this furnace should be indoors with
special attention given to vent sizing and material,
gas input rate, air temperature rise, unit leveling, and
unit sizing.
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs.
Use care and wear appropriate protective clothing,
safety glasses and gloves when handling parts, and
servicing furnaces.
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
WARNING
!
CAUTION
!
CAUTION
TOP AND
BOTTOM
FLUE COLLAR
IN (mm)
shock, or other conditions which may cause death, personal
injury, or property damage. Consult a qualified installer,
service agency, or your distributor or branch for information or
assistance. The qualified installer or agency must use
factory−authorized kits or accessories when modifying this
product. Refer to the individual instructions packaged with
the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective
clothing, and work gloves. Have a fire extinguisher available.
Read these instructions thoroughly and follow all warnings or
cautions include in literature and attached to the unit. Consult
local building codes, the current editions of the National Fuel
Gas Code (NFGC) NFPA 54/ANSI Z223.1 and the National
Electrical Code (NEC) NFPA 70.
Recognize safety information. This is the safety−alert symbol
. When you see this symbol on the unit and in instructions
or manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, and
CAUTION. These words are used with the safety−alert
symbol. DANGER identifies the most serious hazards which
will result in severe personal injury or death. WARNING
signifies hazards which could result in personal injury or
death. CAUTION is used to identify unsafe practices which
may result in minor personal injury or product and property
damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability, or operation.
1. Use only with type of gas approved for this furnace.
2. Install this furnace only in a location and position as
3. Provide adequate combustion and ventilation air to the
4. Combustion products must be discharged outdoors.
5. Never test for gas leaks with an open flame. Use a
6. Always install furnace to operate within the furnace’s
BOTTOM
WIDTH
IN (mm)
Refer to the furnace rating plate.
specified in the “Location” section of these instructions.
furnace space as specified in “Air for Combustion and
Ventilation” section.
Connect this furnace to an approved vent system only,
as specified in the “Venting” section of these instructions.
commercially available soap solution made specifically
for the detection of leaks to check all connections, as
specified in the “Gas Piping” section.
intended temperature−rise range with a duct system
VENT
CONNECTION
SIZE*
IN (mm)
SHIP WT
LB (KG)
441 01 1402 00
3
which has an external static pressure within the allowable range, as specified in the “Start−Up, Adjustments,
and Safety Check” section. See furnace rating plate.
7. When a furnace is installed so that supply ducts carry
air circulated by the furnace to areas outside the space
containing the furnace, the return air shall also be
handled by duct(s) sealed to the furnace casing and
terminating outside the space containing the furnace.
See “Air Ducts” section.
8. A gas−fired furnace for installation in a residential gar-
age must be installed as specified in the warning box in
the “Location” section.
9. The furnace may be used for construction heat
provided that the furnace installation and operation
complies with the first CAUTION in the LOCATION section of these instructions.
10. These Multipoise Gas−Fired Furnaces are CSA
(formerly A.G.A. and C.G.A.) design−certified for use
with natural and propane gases (see furnace rating
plate) and for installation in alcoves, attics, basements,
closets, utility rooms, crawlspaces, and garages. The
furnace is factory−shipped for use with natural gas. A
CSA (A.G.A. and C.G.A.) listed accessory gas conversion kit is required to convert furnace for use with propane gas.
11. See Figure 1 for required clearances to combustible
construction.
12. Maintain a 1−in. (25 mm) clearance from combustible
materials to supply air ductwork for a distance of 36 in.
Figure 2 - Clearances to Combustibles
(914 mm) horizontally from the furnace. See NFPA 90B
or local code for further requirements.
13. These furnaces SHALL NOT be installed directly on
carpeting, tile, or any other combustible material other
than wood flooring. In downflow installations, factory
accessory floor base MUST be used when installed on
combustible materials and wood flooring. Special base
is not required when this furnace is installed on manufacturer’s coil model numbers END4X, ENW4X or
when coil casing model number NAEA is used. See
Figure 1 for clearance to combustible construction information.
INTRODUCTION
N8MSN & N8MSL 4−way multipoise Category I fan−assisted
furnace is CSA design−certified. A Category I fan−assisted
furnace is an appliance equipped with an integral mechanical
means to either draw or force products of combustion through
the combustion chamber and/or heat exchanger. The furnace
is factory−shipped for use with natural gas. This furnace is
not approved for installation in mobile homes, recreational
vehicles, or outdoors.
This furnace is designed for minimum continuous return−air
temperature of 60F (16C) db or intermittent operation down
to 55F (13C) db such as when used with a night setback
thermostat. Return−air temperature must not exceed 80F
(27C) db. Failure to follow these return−air temperature limits
may affect reliability of heat exchangers, motors, and
controls. (See Figure 3)
4
441 01 1402 00
Figure 3 - Return Air Temperature
80F/27C
60F/16C
A06745
For accessory installation details, refer to the applicable
instruction literature.
NOTE: Remove all shipping brackets and materials before
operating the furnace.
CODES AND STANDARDS
Follow all national and local codes and standards in
addition to these instructions. The installation must comply
with regulations of the serving gas supplier, local building,
heating, plumbing, and other codes. In absence of local
codes, the installation must comply with the national codes
listed below and all authorities having jurisdiction. In the
United States , follow all codes and standards for the
following:
Step 1 —Safety
National Fuel Gas Code (NFGC) NFPA
54−2009/ANSI Z223.1−2009 and the Installation
Standards, Warm Air Heating and Air Conditioning
Systems ANSI/NFPA 90B
Step 2 —General Installation
Current edition of the NFGC and the NFPA 90B. For
copies, contact the National Fire Protection Association Inc., Batterymarch Park, Quincy, MA 02269;
(www.NFPA.org) or for only the NFGC, contact the
American Gas Association, 400 N. Capitol Street,
N.W., Washington, DC 20001 (www.AGA.org).
Step 3 —Combustion and Ventilation Air
Section 9.3 of the NFGC, NFPA 54 / ANSI
Z223.1−2009 Air for Combustion and Ventilation
Step 4 —Duct Systems
Air Conditioning Contractors Association (ACCA)
Manual D, Sheet Metal and Air Conditioning Contractors National Association (SMACNA), or American Society of Heating, Refrigeration, and Air Conditioning Engineers (ASHRAE) 2001 Fundamentals
Handbook Chapter 34 or 2000 HVAC Systems and
Equipment Handbook Chapters 9 and 16.
Step 5 —Acoustical Lining and Fibrous Glass
Duct
Current edition of SMACNA and NFPA 90B as
tested by UL Standard 181 for Class I Rigid Air
Ducts
Step 6 —Gas Piping and Gas Pipe Pressure
Testing
NFGC; NFPA 54 / ANSI Z223.1−2009 chapters 5, 6,
7 and 8 and National Plumbing Codes
Step 7 —Electrical Connections
National Electrical Code (NEC) ANSI/NFPA
70−2008
Step 8 —Venting
NFGC NFPA 54 / ANSI Z223.1−2009; chapters 12
and 13
ELECTROSTATIC DISCHARGE (ESD)
PRECAUTIONS PROCEDURE
!
CAUTION
FURNACE RELIABILITY HAZARD
Failure to follow this caution may result in furnace
component damage.
Electrostatic discharge can affect electronic components.
Follow the Electrostatic Discharge Precautions
Procedure listed below during furnace installation and
servicing to protect the furnace electronic control.
Precautions will prevent electrostatic discharges from
personnel and hand tools which are held during the
procedure. These precautions will help to avoid exposing
the control to electrostatic discharge by putting the
furnace, the control, and the person at the same
electrostatic potential.
1. Disconnect all power to the furnace. Multiple disconnects may be required. DO NOT TOUCH THE
CONTROL OR ANY WIRE CONNECTED TO THE
CONTROL PRIOR TO DISCHARGING YOUR BODY’S
ELECTROSTATIC CHARGE TO GROUND.
2. Firmly touch the clean, unpainted, metal surface of the
furnace chassis which is close to the control. Tools
held in a person’s hand during grounding will be satisfactorily discharged.
3. After touching the chassis, you may proceed to service
the control or connecting wires as long as you do nothing to recharge your body with static electricity (for example; DO NOT move or shuffle your feet, do not touch
ungrounded objects, etc.).
4. If you touch ungrounded objects (and recharge your
body with static electricity), firmly touch a clean, unpainted metal surface of the furnace again before
touching control or wires.
5. Use this procedure for installed and uninstalled (ungrounded) furnaces.
6. Before removing a new control from its container, discharge your body’s electrostatic charge to ground to
protect the control from damage. If the control is to be
installed in a furnace, follow items 1 through 4 before
bringing the control or yourself in contact with the furnace. Put all used and new controls into containers before touching ungrounded objects.
7. An ESD service kit (available from commercial
sources) may also be used to prevent ESD damage.
441 01 1402 00
5
LOCATION
!
WARNING
CARBON MONOXIDE POISONING AND UNIT
DAMAGE HAZARD
Failure to follow this warning could result in personal
injury or death, and unit component damage.
Corrosive or contaminated air may cause failure of parts
containing flue gas, which could leak into the living
space. Air for combustion must not be contaminated by
halogen compounds, which include fluoride, chloride,
bromide, and iodide. These elements can corrode heat
exchangers and shorten furnace life. Air contaminants
are found in aerosol sprays, detergents, bleaches,
cleaning solvents, salts, air fresheners, and other
household products. Do not install furnace in a corrosive
or contaminated atmosphere. Make sure all combustion
and circulating air requirements are met, in addition to
all local codes and ordinances.
Figure 4 - Multipoise Orientations
THE BLOWER IS LOCATED
TO THE RIGHT OF THE
BURNER SECTION, AND
AIR CONDITIONED AIR IS
DISCHARGED TO THE LEFT.
GENERAL
This multipoise furnace is shipped in packaged configuration.
Some assembly and modifications are required when used in
any of the four applications shown in Figure 4.
This furnace must:
be installed so the electrical components are protected from water.
not be installed directly on any combustible material
other than wood flooring for upflow applications.
Downflow installations require use of a factory−approved floor base, coil model numbers END4X,
ENW4X or coil casing model number NAEA when
installed on combustible materials or wood flooring.
(Refer to SAFETY CONSIDERATIONS).
be located as close to the chimney or vent and attached to an air distribution system. Refer to Air
Ducts section.
THE BLOWER IS
LOCATED BELOW THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED UPWARD.
THE BLOWER IS
LOCATED ABOVE THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED DOWNWARD
be provided ample space for servicing and cleaning.
Always comply with minimum fire protection clearances shown on the furnace clearance to combustible label.
The following types of furnace installations may require OUTDOOR AIR for combustion due to chemical exposures:
Commercial buildings
Buildings with indoor pools
Laundry rooms
Hobby or craft rooms, and
Chemical storage areas
If air is exposed to the following substances, it should not be
used for combustion air, and outdoor air may be required for
combustion:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine based swimming pool chemicals
THE BLOWER IS
LOCATED TO THE LEFT
OF THE BURNER SECTION,
AND CONDITIONED AIR IS
DISCHARGED TO THE RIGHT.
A02097
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 fabric softeners for clothes dryers
Masonry acid washing materials
All fuel−burning equipment must be supplied with air for fuel
combustion. Sufficient air must be provided to avoid negative
pressure in the equipment room or space. A positive seal
must be made between the furnace cabinet and the
return−air duct to prevent pulling air from the burner area and
from draft safeguard opening.
6
441 01 1402 00
!
FIRE, INJURY OR DEATH HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
When the furnace is installed in a residential garage,
the burners and ignition sources must be located at
least 18 in. (457 mm) above the floor. The furnace
must be located or protected to avoid damage by
vehicles. When the furnace is installed in a public
garage, airplane hangar, or other building having a
hazardous atmosphere, the furnace must be installed
in accordance with the NFPA 54/ANSI Z223.1−2009 .
(See Figure 5)
PERSONAL INJURY AND/OR PROPERTY
DAMAGE HAZARD
Failure to follow this caution may result in furnace
component damage.
This gas furnace may be used for heating buildings
under construction provided that:
−The furnace is permanently installed with all
electrical wiring, piping, venting and ducting installed
according to these installation instructions. A return
air duct is provided, sealed to the furnace casing, and
terminated outside the space containing the furnace.
This prevents a negative pressure condition as
created by the circulating air blower, causing a flame
rollout and/or drawing combustion products into the
structure.
−The furnace is controlled by a thermostat. It may not
be hot wired to provide heat continuously to the
structure without thermostatic control.
−Clean outside air is provided for combustion. This is
to minimize the corrosive effects of adhesives,
sealers and other construction materials. It also
prevents the entrainment of drywall dust into
combustion air, which can cause fouling and plugging
of furnace components.
−The temperature of the return air to the furnace is
maintained between 55F (13C) and 80F (27C),
with no evening setback or shutdown. The use of the
furnace while the structure is under construction is
deemed to be intermittent operation per our
installation instructions.
−The air temperature rise is within the rated rise
range on the furnace rating plate, and the gas input
rate has been set to the nameplate value.
−The filters used to clean the circulating air during the
construction process must be either changed or
thoroughly cleaned prior to occupancy.
−The furnace, ductwork and filters are cleaned as
necessary to remove drywall dust and construction
debris from all HVAC system components after
construction is completed.
−Verify proper furnace operating conditions including
ignition, gas input rate, air temperature rise, and
venting according to these installation instructions.
WARNING
!
CAUTION
Figure 5 - Installation in a Garage
18−IN. (457.2 mm)
MINIMUM TO BURNERS
A93044
!
FIRE HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Do not install the furnace on its back or hang furnace
with control compartment facing downward. Safety
control operation will be adversely affected. Never
connect return−air ducts to the back of the furnace.
(See Figure 6)
Figure 6 - Prohibit Installation on Back
LOCATION RELATIVE TO COOLING EQUIPMENT
The cooling coil must be installed parallel with, or on the
downstream side of the unit to avoid condensation in the heat
exchangers. When installed parallel with the furnace,
dampers or other flow control must prevent chilled air from
entering the furnace. If the dampers are manually operated,
they must be equipped with means to prevent operation of
either unit unless the damper is in the full−heat or full−cool
position.
WARNING
A02054
AIR FOR COMBUSTION AND
VENTILATION
Provisions for adequate combustion, ventilation, and dilution
air must be provided in accordance with:
Section 9.3 of the NFPA 54 / ANSI Z223.1−2009, Air
for Combustion and Ventilation, and applicable provisions of the local building codes.
441 01 1402 00
7
2. Figure 7 illustrates how to provide TWO OUTDOOR
!
CAUTION
FURNACE CORROSION HAZARD
Failure to follow this caution may result in furnace
damage.
Air for combustion must not be contaminated by
halogen compounds, which include fluoride, chloride,
bromide, and iodide. These elements can corrode
heat exchangers and shorten furnace life. Air
contaminants are found in aerosol sprays,
detergents, bleaches, cleaning solvents, salts, air
fresheners, and other household products.
!
WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
The operation of exhaust fans, kitchen ventilation
fans, clothes dryers, attic exhaust fans or fireplaces
could create a NEGATIVE PRESSURE CONDITION
at the furnace. Make−up air MUST be provided for the
ventilation devices, in addition to that required by the
furnace. Refer to Carbon Monoxide Poisoning Hazard
warning in venting section of these instructions to
determine if an adequate amount of make−up air is
available.
The requirements for combustion and ventilation air depend
upon whether or not the furnace is located in a space having
a volume of at least 50 cu/ft. per 1,000 Btuh input rating for all
gas appliances installed in the space.
Spaces having less than 50 cu/ft. per 1,000 Btuh
require the OUTDOOR COMBUSTION AIR
METHOD.
Spaces having at least 50 cu/ft. per 1,000 Btuh may
use the INDOOR COMBUSTION AIR, STANDARD
or KNOWN AIR INFILTRATION METHOD.
Outdoor Combustion Air Method
1. Provide the space with sufficient air for proper combustion, ventilation, and dilution of flue gases using permanent horizontal or vertical duct(s) or opening(s) directly communicating with the outdoors or spaces that
freely communicate with the outdoors.
Table 2—Minimum Free Area Required for Each Combustion Air Opening of Duct to Outdoors
TWO HORIZONTAL DUCTS SINGLE DUCT OR OPENING
FURNACE
INPUT
(BTUH)
44,000 22 (14194) 6 (152) 14.7 (9484) 5 (127) 11 (7096) 4 (102)
66,000 33 (21290) 7 (178) 22.0 (14193) 6 (152) 16.5 (10645) 5 (127)
88,000 44 (28387) 8 (203) 29.3 (18903) 7 (178) 22 (14193) 6 (152)
110,000 55 (35484) 9 (229) 36.7 (23677) 7 (178) 27.5 (17742) 6 (152)
132,000 66 (42580) 10 (254) 44 .0 (28387) 8 (203) 33 (21290) 7 (178)
154,000 77 (49677) 10 (254) 51.3 (33096) 9 (229) 38.5 (24839) 8 (203)
(1 SQ. IN./2,000 BTUH)
(1,100 SQ. MM/KW)
Free Area of
Opening and Duct
Sq. In. (Sq. mm)
Round Duct
Dia.
In. (mm)
(1 SQ. IN./3,000 BTUH)
(734 SQ. MM/KW)
Free Area of
Opening and Duct
Sq. In. (Sq. mm)
OPENINGS, one inlet and one outlet combustion and
ventilation air opening, to the outdoors.
a. One opening MUST commence within 12 in. (300
mm) of the ceiling and the second opening MUST
commence within 12 in. (300 mm) of the floor.
b. Size openings and ducts per Figure 7 and Table 2.
c. TWO HORIZONTAL DUCTS require 1 sq./in. of free
area per 2,000 Btuh (1,100 mm
input for all gas appliances in the space per
Figure 7 and Table 2.
d. TWO OPENINGS OR VERTICAL DUCTS require 1
sq./in. of free area per 4,000 Btuh (550 mm2/kW)
for combined input of all gas appliances in the
space per Figure 7 and Table 2.
3. ONE OUTDOOR OPENING requires:
a. 1 square inch of free area per 3,000 Btuh (734
mm2/kW) for combined input of all gas appliances
in the space per Table 2 and
b. Not less than the sum of the areas of all vent con-
nectors in the space.
The opening shall commence within 12 in. (300 mm) of the
ceiling. Appliances in the space shall have clearances of at
least 1 in. (25 mm) from the sides and back and 6 in. (150
mm) from the front. The opening shall directly communicate
with the outdoors or shall communicate through a vertical or
horizontal duct to the outdoors or spaces (crawl or attic) that
freely communicate with the outdoors.
Indoor Combustion Air NFPA & AGA
Standard and Known−Air−Infiltration Rate Methods
Indoor air is permitted for combustion, ventilation, and
dilution, if the Standard or Known−Air−Infiltration Method
is used.
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in death
and/or personal injury.
Many homes require air to be supplied from outdoors
for furnace combustion, ventilation, and dilution of flue
gases. The furnace combustion air supply must be
provided in accordance with this instruction manual.
Round Duct
Dia.
In. (mm)
WARNING
TWO OPENINGS OR VERTICAL
(1 SQ. IN./4,000 BTUH)
(550 SQ. MM/KW)
Free Area of
Opening and Duct
Sq. In. (Sq. mm)
2
/kW) of combined
DUCTS
Round Duct
Dia.
In. (mm)
EXAMPLES: Determining Free Area
FURNACE WATER HEATER TOTAL INPUT
110,000 + 30,000 = (140,000 divided by 4,000) = 35.0 Sq. In. for each two Vertical Ducts or Openings
66,000 + 40,000 = (106,000 divided by 3,000) = 35.3 Sq. In. for a Single Duct or Opening
88,000 + 30,000 = (118,000 divided by 2,000) = 59.0 Sq. In. for each of two Horizontal Ducts
8
441 01 1402 00
Table 3—Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from Indoors
OTHER THAN FAN‐ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
ACH
0.60
0.50
0.40
0.30
0.20
0.10
30 40 50 44 66 88 110 132 154
1,050
(29.7)
1,260
(35.6)
1,575
(44.5)
2,100
(59.4)
3,150
(89.1)
6,300
(178.3)
1,400
(39.6)
1,680
(47.5)
2,100
(59.4)
2,800
(79.2)
4,200
(118.9)
8,400
(237.8)
1,750
(49.5)
2,100
(59.4)
2,625
(74.3)
3,500
(99.1)
5,250
(148.6)
10,500
(297.3)
1,100
(31.1)
1,320
(37.3)
1,650
(46.7)
2,200
(62.2)
3,300
(93.4)
6,600
(186.8)
Space Volume Ft
1,650
(46.7)
1,980
(56.0)
2,475
(70.0)
3,300
(93.4)
4,950
(140.1)
9,900
(280.3)
FAN‐ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
3
3
(M
)
2,200
(62.2)
2,640
(74.7)
3,300
(93.4)
4,400
(124.5)
6,600
(186.8)
13,200
(373.7)
2,750
(77.8)
3,300
(93.4)
4,125
(116.8)
5,500
(155.7)
8,250
(233.6)
16,500
(467.2)
3,300
(93.4)
3,960
(112.1)
4,950
(140.1)
6,600
(186.8)
9,900
(280.3)
19,800
(560.6)
0.00 NP NP NP NP NP NP NP NP NP
NP = Not Permitted
Figure 7 - Air for Combustion, Ventilation, and Dilution
for Outdoors
1 SQ IN.
E
12 ″ MAX
(305mm)
PER 4000
BTUH*
F
1 SQ IN .
BTUH*
1 SQ IN .
BTUH*
G
1 SQ IN.
PER 4000
BTUH*
12 ″
(305mm)
MAX
PER
4000
OUTDOORS
PER
4000
12 ″
(305mm)
MAX
A03174
DUCTS
TO
O UTDOORS
(305mm)
12 ″ MAX
1 SQ IN.
PER 2000
BTUH*
DUCT S
TO
OUTDOORS
1 SQ IN.
PER 2000
BTUH*
(305mm)
12 ″ MAX
CIRCULA TING AIR DUCT S
*Minimum dimensions of 3-in. (76 mm).
NOTE: Use any of the following combinations of openings:
A & B C & D D & E F & G
B
AIR DUCTS
C IRCULA TING
A
OF COMB USTION AIR
CLEARANCE IN FRONT
D
VENT
THR OUGH
R OOF
(76mm)
AT LEAST 3 IN .
OPENINGS SHALL BE
C
DUCT
TO
OUTDOORS
The Standard Method:
1. The space has no less volume than 50 cu/ft. per 1,000
Btuh of the maximum input ratings for all gas appliances installed in the space and
2. The air infiltration rate is not known to be less than 0.40
air changes per hour (ACH).
The Known Air Infiltration Rate Method shall be used, if the
infiltration rate is known to be:
1. Less than 0.40 ACH and
Figure 8 - Air for Combustion, Ventilation, and Dilution
from Indoors
CIRCULATING AIR
DUCTS
INTERIOR
HEATED
SPACE
CIRCULATING AIR DUCTS
* Minimum opening size is 100 sq in. (64516 sq. mm)with minimum dimensions of
3 in. (76 mm)
† Minimum of 3 in. (76 mm) when type‐B1 vent is used.
VENT THROUGH ROOF
12" MAX
1 SQ IN.
PER 1000
BTUH* IN DOOR
OR WALL
UNCONFINED
SPACE
(152mm)
6" MIN
(FRONT)
1 SQ IN.
PER 1000
BTUH* IN DOOR
OPENINGS SHALL BE AT LEAST 3 IN.
OR WALL
CLEARANCE IN FRONT OF COMBUSTION AIR
12" MA X
(305mm)
Ü
Table 3 − Minimum Space Volumes were determined by
using the following equations from the National Fuel Gas
Code ANSI Z223.1−2009/NFPA 54−2009, 9.3.2.2:
1. For other than fan−assisted appliances, such as a
draft hood−equipped water heater:
Volume
Other
=
21ft
ACH
3
I
other
1000 Btu/hr
2. Equal to or greater than 0.10 ACH
Infiltration rates greater than 0.60 ACH shall not be used. The
minimum required volume of the space varies with the
number of ACH and shall be determined per Table 3 or
Equations 1 and 2. Determine the minimum required volume
for each appliance in the space and add the volumes
together to get the total minimum required volume for the
2. For fan−assisted appliances such as this furnace:
Volume
Fan
=
15ft
ACH
3
I
fan
1000 Btu/hr
space.
441 01 1402 00
3,850
(109.0)
4,620
(130.8)
5,775
(163.5)
7,700
(218.0)
11,550
(327.0)
23,100
(654.1)
(305mm)
A03175
A04002
A04003
9
If:
I
other = combined input of all other than fan−assisted
appliances in Btuh/hr
I
fan = combined input of all fan−assisted appliances in
Btuh/hr ACH = air changes per hour (ACH shall not exceed
0.60.) The following requirements apply to the Standard
Method and to the Known Air Infiltration Rate Method.
1. Adjoining rooms can be considered part of a space if:
a. There are no closeable doors between rooms.
b. Combining spaces on same floor level. Each open-
ing shall have free area of at least 1 in.
(2,000 mm
2
/kW) of the total input rating of all gas
appliances in the space, but not less than 100 in.
2
/1,000 Btuh
2
(0.06 m2). One opening shall commence within 12
in. (300 mm) of the ceiling and the second opening
shall commence within 12 in. (300 mm) of the floor.
The minimum dimension of air openings shall be at
least 3 in. (80 mm). (See Figure 8)
c. Combining space on different floor levels. The
volumes of spaces on different floor levels shall be
considered as communicating spaces if connected
by one or more permanent openings in doors or
floors having free area of at least 2 in.
(4,400 mm
2
/kW) of total input rating of all gas appli-
2
/1,000 Btuh
ances.
2. An attic or crawlspace may be considered a space that
freely communicates with the outdoors provided there
are adequate permanent ventilation openings directly
to outdoors having free area of at least 1−in.
2
/4,000
Btuh of total input rating for all gas appliances in the
space.
3. In spaces that use the Indoor Combustion Air Method,
infiltration should be adequate to provide air for combustion, permanent ventilation and dilution of flue
gases. However, in buildings with unusually tight construction, additional air MUST be provided using the
methods described in the Outdoor Combustion Air
Method section.
Unusually tight construction is defined as Construction with:
a. Walls and ceilings exposed to the outdoors have a
continuous, sealed vapor barrier. Openings are gasketed or sealed and
b. Doors and openable windows are weatherstripped
and
c. Other openings are caulked or sealed. These in-
clude joints around window and door frames,
between sole plates and floors, between wall−ceil-
ing joints, between wall panels, at penetrations for
plumbing, electrical and gas lines, etc.
Combination of Indoor and Outdoor Air
1. Indoor openings shall comply with the Indoor Com-
bustion Air Method below and,
2. Outdoor openings shall be located as required in the
Outdoor Combustion Air Method mentioned previously and,
3. Outdoor openings shall be sized as follows:
a. Calculate the Ratio of all Indoor Space volume di-
vided by required volume for Indoor Combustion
Air Method below.
b. Outdoor opening size reduction Factor is 1 minus
the Ratio in a. above.
c. Minimum size of Outdoor openings shall be the size
required in Outdoor Combustion Air Method
above multiplied by reduction Factor in b. above.
The minimum dimension of air openings shall be
not less than 3 in. (80 mm).
INSTALLATION
UPFLOW INSTALLATION
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel
installed in bottom return−air opening. Remove and discard
this panel when bottom return air is used. To remove bottom
closure panel, perform the following:
1. Tilt or raise furnace and remove 2 screws holding bottom filler panel. (See Figure 9.)
Figure 9 - Removing Bottom Closure Panel
BOTTOM
CLOSURE
PANEL
BOTTOM
FILLER PANEL
2. Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
Side Return Air Inlet
These furnaces are shipped with bottom closure panel
installed in bottom return−air opening. This panel MUST be in
place when only side return air is used.
NOTE: Side return−air openings can be used in UPFLOW
and most HORIZONTAL configurations. Do not use side
return−air openings in DOWNFLOW configuration.
In upflow position with side return inlet(s), leveling legs may
be used. (See Figure 10) Install field−supplied, 5/16 x 1−1/2
in. (8 x 38 mm) (max) corrosion−resistant machine bolts,
washers and nuts.
NOTE: Bottom closure must be used when leveling legs are
used. It may be necessary to remove and reinstall bottom
closure panel to install leveling legs. To remove bottom
closure panel, see Item 1. in Bottom Return Air Inlet section.
10
441 01 1402 00
Figure 10 - Leveling Legs
5/
16
″
(8mm)
(8mm)
5/
16
Figure 11 - Floor and Plenum Opening Dimensions
″
1 3 / 4 ″
(44mm)
3
/ 4 ″
1
(44mm)
(8mm)
5
/
16
″
(8mm)
5/
16
″
1
(44mm)
3/
4 ″
3/
1
4 ″
A89014
(44mm)
Leveling Legs (If Desired)
To install leveling legs:
1. Position furnace on its back. Locate and drill a hole in
each bottom corner of furnace. (See Figure 10)
2. For each leg, install nut on bolt and then install bolt and
nut in hole. (Install flat washer if desired.)
3. Install another nut on other side of furnace base. (Install flat washer if desired.)
4. Adjust outside nut to provide desired height, and tighten inside nut to secure arrangement.
5. Reinstall bottom closure panel if removed.
DOWNFLOW INSTALLATION
NOTE: For downflow applications, this furnace is approved
for use on combustible flooring when any one of the following
3 accessories are used:
Downflow combustible floor subbase
Coil model number END4X or ENW4X
Coil casing model number NAEA
1. Determine application being installed from Table 4.
2. Construct hole in floor per Table 4 and Figure 11.
3. Construct plenum to dimensions specified in Table 4
and Figure 11.
4. If downflow subbase is used, install as shown in
Figure 12. If coil model numbers END4X, ENW4X or
coil casing model number NAEA is used, install as
shown in Figure 13.
A
B D
C
A96283
NOTE: It is recommended that the perforated supply−air duct
flanges be completely folded over or removed from furnace
when installing the furnace on a factory−supplied cased coil
or coil box. To remove the supply−air duct flange, use wide
duct pliers or hand seamers to bend flange back and forth
until it breaks off. Be careful of sharp edges. (See Figure 14)
Figure 12 - Furnace, Plenum, and Subbase Installed on
a Combustible Floor
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
A96285
441 01 1402 00
11
Figure 13 - Furnace, Plenum, and Coil or Coil Casing
Installed on a Combustible Floor
FURNACE
APPROVED
COIL ASSEMBLY
OR
COIL BOX
COMBUSTIBLE
FLOORING
SHEET METAL
PLENUM
FLOOR
OPENING
A08556
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel
installed in bottom return−air opening. Remove and discard
this panel when bottom return air is used. To remove bottom
closure panel, perform the following:
1. Tilt or raise furnace and remove 2 screws holding bottom filler panel. (See Figure 9)
2. Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
HORIZONTAL INSTALLATION
!
WARNING
FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in personal
injury, death, or property damage.
Do not install the furnace on its back or hang furnace
with control compartment facing downward. Safety
control operation will be adversely affected. Never
connect return−air ducts to the back of the furnace.
The furnace can be installed horizontally in an attic or crawl
space on either the left−hand (LH) or right−hand (RH) side.
The furnace can be hung from floor joists, rafters or trusses or
installed on a non−combustible platform, blocks, bricks or
pad.
Suspended Furnace Support
The furnace may be supported under each end with threaded
rod, angle iron or metal plumber’s strap as shown. (See
Figure 15 and Figure 16) Secure angle iron to bottom of
furnace as shown. Heavy−gauge sheet metal straps
(plumber’s straps) may be used to suspend the furnace from
each bottom corner. To prevent screws from pulling out, use 2
#8 x 3/4−in. (19 mm) screws into the side and 2 #8 x 3/4−in.
(19 mm) screws in the bottom of the furnace casing for each
strap. (See Figure 15 and Figure 16)
If the screws are attached to ONLY the furnace sides and not
the bottom, the straps must be vertical against the furnace
sides and not pull away from the furnace sides, so that the
strap attachment screws are not in tension (are loaded in
shear) for reliable support.
Platform Furnace Support
Construct working platform at location where all required
furnace clearances are met. (See Figure 2 and Figure 17) For
furnaces with 1−in. (25 mm) clearance requirement on side,
set furnace on non− combustible blocks, bricks or angle iron.
For crawl space installations, if the furnace is not suspended
from the floor joists, the ground underneath furnace must be
level and the furnace set on blocks or bricks.
Roll−Out Protection
Provide a minimum 17−3/4 in. x 22 in. (451 x 559 mm) piece
of sheet metal for flame roll−out protection in front of burner
area for furnaces closer than 12 inches (305 mm) above the
combustible deck or suspended furnaces closer than 12
inches (305 mm) to joists. The sheet metal MUST extend
underneath the furnace casing by 1 in. (25 mm) with the door
removed.
The bottom closure panel on furnaces of widths 17−1/2 in.
(445 mm) and larger may be used for flame roll−out
protection when bottom of furnace is used for return air
connection. See Figure 17 for proper orientation of roll−out
shield.
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel
installed in bottom return−air opening. Remove and discard
this panel when bottom return air is used. To remove bottom
closure panel, perform the following:
1. Tilt or raise furnace and remove 2 screws holding bottom filler panel. (See Figure 9)
2. Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
Side Return Air Inlet
These furnaces are shipped with bottom closure panel
installed in bottom return−air opening. This panel MUST be in
place when side return air inlet(s) is used without a bottom
return air inlet.
Not all horizontal furnaces are approved for side return air
connections. (See Figure 20)
FILTER ARRANGEMENT
!
CARBON MONOXIDE AND POISONING HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never operate a furnace without a filter or with filter
access door removed.
There are no provisions for an internal filter rack in these
furnaces.
A field−supplied accessory external filter rack is required.
This furnace requires 1 in. (25 mm) external filter rack.
Refer to the instructions supplied with external filter rack for
assembly and installation options.
WARNING
12
441 01 1402 00
FURNACE
CASING
WIDTH
14–3/16
(360)
17–1/2
(445)
21
(533)
24−1/2
(622)
Table 4—Opening Dimensions − In. (mm)
APPLICATION
Upflow Applications on Combustible or Noncombustible Flooring
(subbase not required)
Downflow Applications on Noncombustible Flooring
(subbase not required)
Downflow Applications on Combustible Flooring
(subbase required)
Downflow Applications on Combustible Flooring with Coil END4X,
ENW4X or Coil Casing NAEA (subbase not required)
Upflow Applications on Combustible or Noncombustible Flooring
(subbase not required)
Downflow Applications on Noncombustible Flooring
(subbase not required)
Downflow Applications on Combustible Flooring
(subbase required)
Downflow Applications on Combustible Flooring with Coil END4X,
ENW4X or Coil Casing NAEA (subbase not required)
Upflow Applications on Combustible or Noncombustible Flooring
(subbase not required)
Downflow Applications on Noncombustible Flooring
(subbase not required)
Downflow Applications on Combustible Flooring
(subbase required)
Downflow Applications on Combustible Flooring with Coil END4X,
ENW4X or Coil Casing NAEA (subbase not required)
Upflow Applications on Combustible or Noncombustible Flooring
(subbase not required)
Downflow Applications on Noncombustible Flooring
(subbase not required)
Downflow Applications on Combustible flooring
(subbase required)
Downflow Applications on Combustible Flooring with Coil END4X,
ENW4X or Coil Casing NAEA (subbase not required)
PLENUM OPENING FLOOR OPENING
A B C D
12−11/16
(322)
12−9/16
(319)
11−13/16
(284)
12−5/16
(319)
16
(406)
15−7/8
(403)
15−1/8
(384)
15−1/2
(394)
19−1/2
(495)
19−3/8
(492)
18−5/8
(473)
19
(483)
23
(584)
22−7/8
(581)
22−1/8
(562)
22−1/2
(572)
21−5/8
(549)
19
(483)
19
(483)
19
(483)
21−5/8
(549)
19
(483)
19
(483)
19
(483)
21−5/8
(549)
19
(483)
19
(483)
19
(483)
21−1/8
(537)
19
(483)
19
(483)
19
(483)
13−5/16
(338)
13−3/16
(335)
13−7/16
(341)
13−5/16
(338)
16−5/8
(422)
16−1/2
(419)
16−3/4
(425)
16−1/2
(419)
20−1/8
(511)
20
(508)
20−1/4
(514)
20
(508)
23−5/8
(600)
23−1/2
(597)
23−3/4
(603)
23−1/2
(597)
22−1/4
19−5/8
20−5/8
22−1/4
19−5/8
20−5/8
22−1/4
19−5/8
20−5/8
22−1/4
19−5/8
20−5/8
(565)
(498)
(600)
20
(508)
(565)
(498)
(600)
20
(508)
(565)
(498)
(600)
20
(508)
(565)
(498)
(600)
20
(508)
AIR DUCTS
General Requirements
The duct system should be designed and sized according to
accepted national standards such as those published by: Air
Conditioning Contractors Association (ACCA), Sheet Metal
and Air Conditioning Contractors National Association
(SMACNA) or American Society of Heating, Refrigerating and
Air Conditioning Engineers (ASHRAE) or consult The Air
Systems Design Guidelines reference tables available from
your local distributor. The duct system should be sized to
handle the required system design CFM at the design
external static pressure. The furnace airflow rates are
provided in Table 5 − AIR DELIVERY−CFM (With Filter).
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.
Secure ductwork with proper fasteners for type of ductwork
used. Seal supply− and return−duct connections to furnace
with code approved tape or duct sealer.
NOTE: Flexible connections should be used between
ductwork and furnace to prevent transmission of vibration.
Ductwork passing through unconditioned space should be
insulated and sealed to enhance system performance. When
air conditioning is used, a vapor barrier is recommended.
Maintain a 1−in. (25 mm) clearance from combustible
materials to supply air ductwork for a distance of 36 in. (914
mm) horizontally from the furnace. See NFPA 90B or local
code for further requirements.
Ductwork Acoustical Treatment
NOTE: Metal duct systems that do not have a 90 degree
elbow and 10 ft. (3 M) of main duct to the first branch take−off
may require internal acoustical lining. As an alternative,
fibrous ductwork may be used if constructed and installed in
accordance with the latest edition of SMACNA construction
standard on fibrous glass ducts. Both acoustical lining and
fibrous ductwork shall comply with NFPA 90B as tested by UL
Standard 181 for Class 1 Rigid air ducts.
Supply Air Connections
For a furnace not equipped with a cooling coil, the outlet duct
shall be provided with a removable access panel. This
opening shall be accessible when the furnace is installed and
shall be of such a size that the heat exchanger can be
viewed for possible openings using light assistance or a
probe can be inserted for sampling the air stream. The cover
attachment shall prevent leaks.
441 01 1402 00
13
Table 5—Air Delivery − CFM (with Filter)*
FURNACE
SIZE
0451408A
0451412A
0701408A
0701412A
0701716A
0901714B
0902116A
0902120A
1101712A
1102116A
1102122A
1352116A
1352422A
1552420A
* A filter is required for each return-air inlet. Airflow performance included 3/4-in. (19 mm) washable filter media such as contained in factory-authorized accessory
filter rack. To determine airflow performance without this filter, assume an additional 0.1 in. w.c. available external static pressure.
-- Indicates unstable operating conditions.
RETURN−AIR
INLET
Bottom
or
Side(s)
Bottom
or
Side(s)
Bottom
or
Side(s)
Bottom
or
Side(s)
Bottom
or
Side(s)
Bottom
or
Side(s)
Bottom
or
Side(s)
Bottom Only
Both Sides
or
1 Side & Bottom
1 Side Only
Bottom
or
Side(s)
Bottom
or
Side(s)
Bottom Only
Bottom, Sides
or 1 Side &
Bottom
1 Side Only
Bottom
or
Side(s)
Bottom Only
Bottom, Sides
or Side &
Bottom
1 Side Only
Bottom Only
Both Sides
or
1 Side & Bottom
1 Side Only
SPEED
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
High
Med−Low
Low
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
1085
920
820
1440
1360
1250
1030
835
725
1425
1320
1200
1805
1630
1460
1650
1515
1385
1205
2060
1790
1505
2405
2225
2020
2530
2285
1995
2475
2260
1950
1625
1510
1360
2035
1745
1530
2530
2230
1920
2235
1920
2540
2125
2090
1790
1545
2485
2195
1880
“2180
1880
2135
1880
2465
2115
1800
2155
1800
2140
1800
−−
−−
−−
−−
−−
−−
1035
875
775
1375
1300
1210
1010
815
700
1375
1280
1175
1740
1585
1420
1600
1485
1360
1180
1985
1765
1505
2310
2155
1955
2450
2215
1945
2395
2190
1910
1575
1470
1335
1965
1710
1515
2470
2205
1900
−−
220
1900
2495
2120
1795
2010
1755
1525
2400
2150
1850
−−
2145
1850
−−
2085
1850
2430
2105
1790
−−
2135
1790
−−
2095
1790
EXTERNAL STATIC PRESSURE (in. w.c.)
975
830
730
1305
1240
1160
980
790
675
1320
1240
1145
1670
1530
1385
1535
1440
1320
1160
1915
1715
1480
2220
2080
1880
2365
2150
1900
2300
2110
1855
1515
1415
1295
1880
1650
1470
2400
2165
1880
2415
2155
1880
2430
2105
1790
1930
1705
1500
2310
2090
1820
2385
2060
1820
2245
2035
1820
2375
2075
1770
2375
2095
1770
2260
2040
1770
915
770
680
1240
1175
1100
945
760
645
1265
1205
1105
1600
1470
1325
1465
1380
1260
1120
1820
1645
1440
2130
1995
1805
2270
2075
1840
2200
2035
1795
1445
1355
1250
1790
1560
1400
2320
2110
1845
2350
2100
1845
2355
2060
1765
1835
1640
1450
2215
2000
1780
2305
2010
1780
2155
1975
1780
2305
2030
1735
2285
2040
1735
2180
1975
1735
845
710
620
1160
1115
1040
900
720
600
1200
1140
1050
1530
1405
1280
1385
1300
1195
1065
1720
1560
1375
2025
1895
1730
2165
1985
1770
2090
1940
1730
1355
1285
1180
1680
1450
1310
2220
2035
1795
2250
2040
1795
2265
2010
1720
1710
1550
1380
2110
1920
1715
2195
1945
1715
2055
1895
1715
2230
1980
1695
2200
1975
1695
2085
1890
1695
770
640
555
1070
1040
965
845
675
555
1125
1075
990
1445
1330
1220
1285
1220
1120
1005
1610
1470
1300
1920
1785
1630
2065
1890
1685
1985
1845
1650
1260
1185
1100
1495
1340
1215
2115
1950
1730
2145
1955
1730
2175
1940
1650
1590
1465
1315
2000
1825
1635
2085
1865
1635
1940
1795
1635
2110
1910
1640
2105
1895
1640
1975
1810
1640
675
555
470
975
950
885
775
610
475
1035
995
920
1360
1255
1155
1175
1115
1025
925
1490
1345
1190
1790
1675
1535
1940
1780
1600
1865
1735
1555
1165
1070
985
1365
1205
1095
2000
1855
1650
2015
1850
1650
2065
1840
1585
1470
1360
1215
1880
1720
1540
1960
1765
1540
1825
1685
1540
2000
1830
1570
1995
1790
1570
1865
1705
1570
565
440
360
870
850
790
680
490
390
940
905
840
1280
1170
1080
1055
990
915
810
1340
1195
1045
1660
1565
1420
1805
1660
1480
1730
1620
1445
990
890
810
1215
1090
990
1865
1740
1555
1875
1740
1555
1935
1730
1500
1335
1210
1005
1725
1565
1415
1825
1660
1415
1695
1565
1415
1865
1725
1465
1870
1685
1465
1740
1595
1465
390
250
190
730
725
670
490
375
300
830
790
725
1180
1080
995
895
830
710
630
1135
1010
890
1530
1420
1275
1670
1525
1350
1585
1475
1310
785
725
−−
1075
955
830
1730
1615
1460
1715
1595
1460
1785
1615
1390
1025
945
855
1535
1405
1290
1670
1515
1290
1555
1445
1290
1725
1590
1345
1730
1550
1345
1605
1480
1345
195
−−
−−
560
575
520
335
265
−−
655
620
555
1075
990
910
645
600
565
510
925
820
740
1350
1260
1135
1505
1360
1180
1425
1325
1150
−−
−−
−−
875
750
670
1590
1485
1340
1560
1470
1340
1650
1485
1280
835
785
670
1355
1255
1160
1465
1325
1160
1385
1265
1160
1545
1425
1225
1570
1400
1225
1455
1325
1225
14
441 01 1402 00
Figure 14 - Duct Flanges
UPFLOW DOWNFLOW HORIZONTAL
90°
120°
MIN
YES
YES
NO
120°
MIN
YES
YES
NO
Figure 15 - Horizontal Unit Suspension
1
/ 4
" (6mm) THREADED ROD
4 REQ.
120°
MIN
90°
YES
YES
NO
A02020
OUTER DOOR
A S SEMBLY
8" (203mm)
FOR DOOR REMOVAL
(2) HEX NUTS, (2) WASHERS & (2) LOCK WASHERS
REQ. PER ROD
MIN
SECURE ANGLE
IRON TO BOTTOM
OF FURNACE WITH
3
/4" (19mm) SCREWS
3 #8 x
TYPICAL FOR 2 SUPPORTS
1” (25mm) SQUARE, 1-1/4”x1-1/4”x1/8” (32x32x3mm)
ANGLE IRON OR UNI-STRUT MAY BE USED
A10130
441 01 1402 00
15
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