ICP N8MSL0451408A1, N8MSL0451412A1, N8MSL0701408A1, N8MSL0701412A1, N8MSL0701716A1 Installation Guide
...
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 The signal word WARNING is used throughout this manual inthe
are used to identify levels of hazard seriousness. The signal word following manner:
DANGER isonly 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 The signal word CAUTION is used throughout this manual in the
manual that may apply to the product, following manner:
DANGER - Immediate hazards which will result in severe person-
at 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 or product labels.
minor personal injury or product or property damage.
NOTE - Used to highlight suggestions which wilt result in en- z_ Safety-alert symbol
hanced installation, reliability, or operation. When you see this symbol on the unit and in instructions or manu-
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
Signal Words on Product Labeling
Signal words are used in combination with colors and/or pictures
als, be alert to the potential for personal injury.
Use of the AHRI Certified TM Mark indicates
a manufacturer's participation in the program.
For verification of certification for individual
IS09001
PERSONAL INJURY, AND/OR PROPERTY
DAMAGE HAZARD
Failure to carefully read and follow this warning could
result in equipment malfunction, property damage,
3ersonal 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
3rocedures 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: Affixthese instructions on or adjacent tothe furnace.
CONSUMER: Retain these instructions for future reference.
products, go to www.ahridirectory.org .
Portionsofthe text and tables are reprintedfrom NFPA54/ANSI Z223.t -20096), with permission of National FireProtectionAssociation, Quincy, MA02269 and American Gas Association,Washing-
ton, DC 20001. This reprinted material is not the complete and official position of the NFPAor ANSI, onthe referencedsubiect, which is represented only by the standard in itsentirety,
PrintedinU.S.A. 441 01 1402 02 May. 2012
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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.
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Table 1--Dimensions - In. (mm)
A
OUTLET
FURNACE SIZE
N8MSN & N8MSL
0451408
0451412
0701408
0701412
0701716
0901714
0902116
0902120
1101712
1102116
1102122
1352116
1352422
1552420
"135 and 155 size furnaces require a 5 or 6-in. (127 or 152 ram) vent.
installation requirements.
CABINET WIDTH
IN (mm)
14-3/16 (360)
14-3/16 (360)
14-3/16 (360)
14-3/16 (360)
17-1/2 (445)
17-1/2 (445)
21 (533)
21 (533)
17-1/2 (445)
21 (533)
21 (533)
21 (533)
24-1/2 (622)
24-1/2 (622) 22-7/8 (581)
WIDTH
IN (mm)
12-9/16 (319)
12-9/16 (319)
12-9/16 (319)
12-9/16 (319)
15-7/8 (403)
15-7/8 (403)
19-3/8 (492)
19-3/8 (492)
15-7/8 (403)
19-3/8 (492)
19-3/8 (492)
19-3/8 (492)
22-7/8 (581)
Use a vent adapter between furnace and vent stack. See Installation Instructions for complete
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
servicin,q furnaces.
Improper installation, adjustment, alteration, service,
maintenance, or use can cause explosion, fire, electrical
C
TOP AND
BOTTOM
FLUE COLLAR
IN (mm)
9-5/16 (237)
9-5/16 (237)
9-5/16 (237)
9-5/16 (237)
11-9/16 (294)
11-9/16 (294)
13-5/16 (338)
13-5/16 (338)
11-9/16 (294)
13-5/16 (338)
13-5/16 (338)
13-5/16 (338)
15-1/16 (383)
15-1/16 (383) 23 (584) 4 (102)* 170 (77)
BOTTOM
WIDTH
IN (mm)
12-11/16 (322)
12-11/16 (322)
12-11/16 (322)
12-11/16 (322)
16 (406)
16 (406)
19-1/2 (495)
19-1/2 (495)
16 (406)
19-1/2 (495)
19-1/2 (495)
19-1/2 (495)
23 (584)
VENT
CONNECTION
SIZE*
IN (mm)
4 (102)
4 (102)
4 (102)
4 (102)
4 (102)
4 (102)
4 (102)
4 (102)
4 (102)
4 (102)
4 (102)
4 (102)*
4 (102)*
SHIP WT
LB(KG)
104 (47)
107 (49)
111(50)
115 (52)
126 (57)
127 (58)
140 (64)
146 (66)
135 (61)
146 (66)
152 (69)
149 (68)
163 (74)
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.
Refer to the furnace rating plate.
2. Install this furnace only in a location and position as
specified in the "Location" section of these instructions.
3. Provide adequate combustion and ventilation air to the
furnace space as specified in "Air for Combustion and
Ventilation" section.
4. Combustion products must be discharged outdoors.
Connect this furnace to an approved vent system only,
as specified in the "Venting" section of these instruc-
tions.
5. Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections, as
specified in the "Gas Piping" section.
6. Always install furnace to operate within the furnace's
intended temperature-rise range with a duct system
441 01 1402 02 3
whichhasanexternalstaticpressurewithintheallow-
ablerange,asspecifiedinthe"Start-Up,Adjustments,
andSafetyCheck"section.Seefurnaceratingplate.
7.Whenafurnaceisinstalledsothatsupplyductscarry
aircirculatedbythefurnacetoareasoutsidethespace
containingthefurnace,thereturnairshallalsobe
handledbyduct(s)sealedtothefurnacecasingand
terminatingoutsidethespacecontainingthefurnace.
See"AirDucts"section.
8.Agas-firedfurnaceforinstallationinaresidentialgar-
agemustbeinstalledasspecifiedinthewarningboxin
the"Location"section.
9.Thefurnacemaybe usedfor constructionheat
providedthatthefurnaceinstallationandoperation
complieswiththefirstCAUTIONintheLOCATIONsec-
tionoftheseinstructions.
10.TheseMultipoiseGas-FiredFurnacesare CSA
(formerlyA.G.A.andC.G.A.)design-certifiedforuse
withnaturalandpropanegases(seefurnacerating
plate)andforinstallationinalcoves,attics,basements,
closets,utilityrooms,crawlspaces,andgarages.The
furnaceisfactory-shippedforusewithnaturalgas.A
CSA(A.G.A.andC.G.A.)listedaccessorygasconver-
sionkitisrequiredtoconvertfurnaceforusewithpro-
panegas.
11.SeeFigure1 forrequiredclearancesto combustible
construction.
12.Maintaina1-in.(25mm)clearancefromcombustible
materialstosupplyairductworkfora distanceof36in.
Figure 2 - Clearances to Combustibles
(914mm)horizontallyfromthefurnace.SeeNFPA90B
orlocalcodeforfurtherrequirements.
13.ThesefurnacesSHALLNOTbeinstalleddirectlyon
carpeting,tile,oranyothercombustiblematerialother
thanwoodflooring.In downflowinstallations,factory
accessoryfloorbaseMUSTbeusedwheninstalledon
combustiblematerialsandwoodflooring.Specialbase
isnotrequiredwhenthisfurnaceisinstalledonmanu-
facturer'scoilmodelnumbersEND4X,ENW4Xor
whencoilcasingmodelnumberNAEAis used.See
Figure1forclearancetocombustibleconstructionin-
formation.
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 60°F (16°0) db or intermittent operation down
to 55_'F (13°0) db such as when used with a night setback
thermostat. Return-air temperature must not exceed 80°F
(27°0) db. Failure to follow these return-air temperature limits
may affect reliability of heat exchangers, motors, and
controls. (See Figure 3)
Improper adjustment, alteration, service,
maintenance, or installation can cause
serious injury or death,
Read and follow instructions and
arecautions in User's Information Manual
erovided with this furnace. Installation
and service must be performed by a
qualified service agency or the gas
supplier,
_IL CAUTION
Check entire gas assembly for leaks after
lighting this appliance.
I INSTALLATION I
1. This furnace must be installed in
accordance with the manufacturer's
instructions and local codes. In the
absence of local codes, follow the National
Fuel Gas Code ANSI Z223.1 / NFPA54
or CSA B-149.1 Gas Installation Code.
2. This furnace must be installed so there are
previsions for combustion and ventilation
air. See manufacturer's installation
information provided with this appliance.
I OPERATION I
This furnace is equipped with manual reset
limit switch(es) in burner compartment to
protect against overheat conditions that
can result from inadequate combustion air
supply or blocked vent conditions.
1. Do not bypass limit switches.
2. If a limit opens, call a quallified
serviceman to correct the condition
and reset limit switch.
MINIMUM INCHES CLEARANCE TO COMBUSTIBLE CONSTRUCTION
This forced air furnace is This furnace is approved for
equipped for use with natural HORIZONTAL installations,
gas at altitudes 0 - 10,000 ft
(0 - 3,050m), Clearancearrows
An accessory kit, supplied by furnaceorientation
the manufacturer, shall be used
to convert to propane gas use
or may be required for some
natural gas applications.
This furnace is for indoor
installation in a building
constructed on site.
This furnace may be installed
on combustible flooring in alcove
or closet at minimum clearance
as indicated by the diagram
from combustible material.
This furnace may be used with Clearancein inches
a Type B-1 Vent and may be VentOlearancetocombustibles:
vented in common with other For Single Wall vents 6 inches (6 po).
gas fired appliances. For Type B-1vent type 1 inch (1 po).
DOWNFLOW POSITIONS:
1" Installation on non-combustible floors only.
For Installation on combustible flooring only when installed on special
base, Part No. KGASB0201ALL or NAHAO1101SB, Coil Assembly,
Part No. CAR, CAP, CNPV, CNRV, END4X, ENW4X, WENC, WTNC,
WENW OR WTNW.
18 inches front clearance required for alcove.
* Indicates supply or return sides when furnace is in the horizontal
position. Line contact only permissible between lines formed by
intersections of the Top and two Sides of the furnace jacket,
and building joists, studs or framing.
I INSTALLATION I
UPFLOW, DOWNFLOW, and
do not change with
MINIMUM INCHES CLEARANCE TO
COMBUSTIBLE CONSTRUCTION
IIIIIIIIIHMIMHI
336996-101 REV. C
4 441 01 1402 02
Figure 3 - Return Air Temperature
MAX 8OoF/27 oO
FRONT
"< :/ MIN 60°F/16°C
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 ANSl/NFPA 90B
Step 2--General Installation
Current edition of the NFGC and the NFPA 90B. For
copies, contact the National Fire Protection Associ-
ation 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, DO 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 Con-
tractors National Association (SMACNA), or Americ-
an Society of Heating, Refrigeration, and Air Condi-
tioning Engineers (ASHRAE) 2001 Fundamentals
Handbook Chapter 34 or 2000 HVAC Systems and
Equipment Handbook Chapters 9 and 16.
--Acoustical Lining and Fibrous GlassStep 5
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
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 discon-
nects 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 wilt be satis-
factorily discharged.
3. After touching the chassis, you may proceed to service
the control or connecting wires as long as you do noth-
ing to recharge your body with static electricity (for ex-
ample; 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, un-
painted metal surface of the furnace again before
touching control or wires.
5. Use this procedure for installed and uninstatled (un-
grounded) furnaces.
6. Before removing a new control from its container, dis-
charge 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 fur-
nace. Put all used and new controls into containers be-
fore touching ungrounded objects.
7. An ESD service kit (available from commercial
sources) may also be used to prevent ESD damage.
441 01 1402 02 5
LOCATION
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
TOTHE RIGHT OFTHE
BURNERSECTION, AND
AiR CONDITIONED AIR IS
DISCHARGEDTO 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 protec-
ted from water.
not be installed directly on any combustible material
other than wood flooring for upflow applications.
Downflow installations require use of a factory-ap-
proved 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 at-
tached to an air distribution system. Refer to Air
Ducts section.
AIRFLOW
THE BLOWER IS
LOCATED BELOWTHE
BURNERSECTION, AND
CONDITIONED AIR IS
DISCHARGED UPWARD.
LOCATEDABOVETHE
BURNER SECTION, AND
THE BLOWER IS '_7
CONDITIONEDAIR IS
DISCHARGED DOWNWARD
be provided ample space for servicing and cleaning.
Always comply with minimum fire protection clear-
ances shown on the furnace clearance to combust-
ible label.
The following types of furnace installations may re-
quire OUTDOOR AIR for combustion due to chemic-
al 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
AIRFLOW
_ HORIZONTAL RIGH_AIRF L_C w
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 02
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)
Figure 5 - Installation in a Garage
18-1N. (457.2 mm)
MINIMUM TO BURNERS
A93044
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 55°F (13°C) and 80°F (27°C),
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.
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
BACK
A02054
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.
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 pro-
visions of the local building codes.
441 01 1402 O2 7
2. Figure 7 illustrates how to provide TWO OUTDOOR
OPENINGS, one inlet and one outlet combustion and
ventilation air opening, to the outdoors.
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.
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 mm2/kW) of combined
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.
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.
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.
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
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.
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 combus-
tion, ventilation, and dilution of flue gases using per-
manent horizontal or vertical duct(s) or opening(s) dir-
ectly communicating with the outdoors or spaces that
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.
freely communicate with the outdoors.
Table 2--Minimum Free Area Re(
TWO HORIZONTAL DUCTS SINGLE DUCT OR OPENING
FURNACE (1 SQ. IN./2,000 BTUH) (1 SQ. IN./3,000 BTUH)
INPUT (1,100 SQ. MM/KW) (734 SQ. MM/KW)
(BTUH) Free Area of Round Duct Free Area of Round Duct Free Area of Round Duct
Opening and Duct Dia. Opening and Duct Dia. Opening and Duct Dia.
Sq. In. (Sq. mm) In. (mm) Sq. In. (Sq. mm) In. (mm) Sq. In. (Sq. mm) In. (mm)
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)
uired for Each Combustion Air Opening of Duct to Outdoors
TWO OPENINGS OR VERTICAL
DUCTS
(1 SQ. IN./4,000 BTUH)
(550 SQ. MM/KW)
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 02
Table 3--Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from Indoors
OTHER THAN FAN-ASSISTED TOTAL FAN-ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE) (1,000'S BTUH GAS INPUT RATE)
30 40 50 44 66 88 110 132 154
ACH Space Volume Ft3 (M3)
0.60 (29.7) (39.6) (49.5) (31.1) (46.7) (62.2) (77.8) (93.4) (109.0)
0.50 (35.6) (47.5) (59.4) (37.3) (56.0) (74.7) (93.4) (112.1 ) (130.8)
0.40 (44.5) (59.4) (74.3) (46.7) (70.0) (93.4) (116.8) (140.1 ) (163.5)
0.30 (59.4) (79.2) (99.1) (62.2) (93.4) (124.5) (155.7) (186.8) (218.0)
0.20 (89.1) (118.9) (148.6) (93.4) (140.1 ) (186.8) (233.6) (280.3) (327.0)
0.10 (178.3) (237.8) (297.3) (186.8) (280.3) (373.7) (467.2) (560.6) (654.1)
0.00 NP NP NP NP NP NP NP NP NP
NP = Not Permitted
Figure 7 -- Air for Combustion, Ventilation, and Dilution
1,050 1,400 1,750 1,100 1,650 2,200 2,750 3,300 3,850
1,260 1,680 2,100 1,320 1,980 2,640 3,300 3,960 4,620
1,575 2,100 2,625 1,650 2,475 3,300 4,125 4,950 5,775
2,100 2,800 3,500 2,200 3,300 4,400 5,500 6,600 7,700
3,150 4,200 5,250 3,300 4,950 6,600 8,250 9,900 11,550
6,300 8,400 10,500 6,600 9,900 13,200 16,500 19,800 23,100
Figure 8 - Air for Combustion, Ventilation, and Dilution
OUTDOORS
for Outdoors
TO
SQ IN.
PER 4000
BTUH*
from Indoors
VENT THROUGH ROOF
(305mm) 12" MAX
1 SQ IN.
PER 2000
BTUH*
DUCTS
TO
OUTDOORS
1 SQ IN.
PER 2000
BTUH*
(305mm)
(305mm)
CIRCULATING AIR DUCTS
TO PER 4000
OUTDOORS BTUH*
*Minimum dimensions of 3-in. (76 mm).
NOTE: Use any ofthe following combinations of openings:
A&BC&DD&EF&G
1 SQ IN.
12_X (305mm)
1 SQ IN.
PER
4000
BTUH*
O3
rr
O
O
a
F-
O
1 SQ IN.
PER
4000
BTUH*
12" (305mm)
MAX
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 appli-
ances installed in the space and
2. The air infiltration rate is not known to be less than 0.40
air changes per hour (ACH).
A03174
I I
INTERIOR
HEATED
SPACE
CIRCULATING AIR DUCTS
Minimum opening size is 100 sq in. (64516 sq. mm)with minimum dimensions of
in. (76 ram)
Minimum of 3 in. (76 mm) when type-B1 vent is used.
Table 3 - Minimum Space Volumes were determined by
using the following equations from the National Fuel Gas
Code ANSI 7223.1-2009/NFPA 54-2009, 9.3.2.2:
1. For other than fan-assisted appliances, such as a
draft hood-equipped water heater:
I
12" AX(305mm)
z
O
2_ 1 SQ IN.
BTUH* IN DOOR
i PER 1000
OR WALL
UNCONFINED
W SPACE
-4,
_: 6" MIN (152mm)
co (FRONT)0
_z 1 SQ IN.
PER 1000
_ BTUH* IN DOOR
OR WALL
L 12"MAX(305ram)
The Known Air Infiltration Rate Method shall be used, if the
infiltration rate is known to be:
1. Less than 0.40 ACH and
Vo'" m e Other: A-A0_ _k,T000 "a_/h r"#
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
2. For fan-assisted appliances such as this furnace:
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
V°lumeFan = ACH _000 Btu/hrJ
15ft3 f[ ]fan ="_
space.
441 01 1402 02 9
A03t 75
A04002
A04003
If:
Iother= combinedinputof all otherthanfan-assisted
appliancesinBtuh/hr
Ifan= combinedinputof all fan-assistedappliancesin
Btuh/hrACH=airchangesperhour(ACHshallnotexceed
0.60.)Thefollowingrequirementsapplyto theStandard
MethodandtotheKnownAirInfiltrationRateMethod.
1.Adjoiningroomscanbeconsideredpartofaspaceif:
a.Therearenocloseabledoorsbetweenrooms.
b.Combiningspacesonsamefloorlevel.Eachopen-
ingshallhavefreeareaofatleast1in.2/1,000Btuh
(2,000mm2/kW)ofthetotalinputratingofallgas
appliancesinthespace,butnotlessthan100in.2
(0.06m2).Oneopeningshallcommencewithin12
in.(300mm)oftheceilingandthesecondopening
shallcommencewithin12in.(300mm)ofthefloor.
Theminimumdimensionofairopeningsshallbeat
least3in.(80mm).(SeeFigure8)
c.Combiningspaceondifferentfloorlevels.The
volumesofspacesondifferentfloorlevelsshallbe
consideredascommunicatingspacesifconnected
byoneormorepermanentopeningsindoorsor
floorshavingfreeareaofatleast2in.2/1,000Btuh
(4,400mm2/kW)oftotalinputratingofallgasappli-
ances.
2.Anatticorcrawlspacemaybeconsideredaspacethat
freelycommunicateswiththeoutdoorsprovidedthere
areadequatepermanentventilationopeningsdirectly
tooutdoorshavingfreeareaofat least1-in.2/4,000
Btuhoftotalinputratingforallgasappliancesinthe
space.
3.InspacesthatusetheIndoorCombustionAirMethod,
infiltrationshouldbeadequatetoprovideairforcom-
bustion,permanentventilationand dilutionof flue
gases.However,inbuildingswithunusuallytightcon-
struction,additionalairMUSTbeprovidedusingthe
methodsdescribedintheOutdoorCombustionAir
Methodsection.
UnusuallytightconstructionisdefinedasConstructionwith:
a.Wallsandceilingsexposedtotheoutdoorshavea
continuous,sealedvaporbarrier.Openingsaregas-
ketedorsealedand
b.Doorsandopenablewindowsareweatherstripped
and
c.Otheropeningsarecaulkedorsealed.Thesein-
cludejointsaroundwindowanddoorframes,
betweensoleplatesandfloors,betweenwall-ceil-
ingjoints,betweenwallpanels,atpenetrationsfor
plumbing,electricalandgaslines,etc.
CombinationofIndoorandOutdoorAir
1.IndooropeningsshallcomplywiththeIndoorCom-
bustionAirMethodbelowand,
2.Outdooropeningsshallbelocatedasrequiredinthe
OutdoorCombustionAir Methodmentionedprevi-
ouslyand,
3.Outdooropeningsshallbesizedasfollows:
a.CalculatetheRatioofallIndoorSpacevolumedi-
videdbyrequiredvolumeforIndoorCombustion
AirMethodbelow.
b.OutdooropeningsizereductionFactoris1minus
theRatioina.above.
c.MinimumsizeofOutdooropeningsshallbethesize
requiredinOutdoorCombustionAirMethod
abovemultipliedbyreductionFactorinb.above.
Theminimumdimensionofairopeningsshallbe
notlessthan3in.(80mm).
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 bot-
tom filler panel. (See Figure 9.)
Figure 9 -- Removing Bottom Closure Panel
I
I
#
I
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.
P
10 441 01 1402 02
Figure 10 - Leveling Legs Figure 11 - Floor and Plenum Opening Dimensions
(8mm)
I
(44mm)
1 3/4"
(44mm)
(8mm)
5/16 _
(8mm)
(44mm) 1 3/4"
(44mm) I 3/4'_.
A89014
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. (In-
stall flat washer if desired.)
4. Adjust outside nut to provide desired height, and tight-
en 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.
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 02 11
Figure 13 - Furnace, Plenum, and Coil or Coil Casing
Installed on a Combustible Floor
FURNACE
APPROVED
COIL ASSEMBLY
OR
COIL BOX
COMBUSTIBLE
FLOORING
\\\\_
_f,=====SHEET METAL =====.=_
I
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 bot-
tom 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
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
PLENUM
FLOOR
OPENING
E
A08556
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 bot-
tom 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.
12 441 01 1402 02
Table 4_Opening Dimensions - In. (mm)
FURNACE
CASING
WIDTH
Upflow Applications on Combustible or Noncombustible Flooring 12-11/16 21-5/8 13-5/16 22-1/4
Downflow Applications on Noncombustible Flooring 12-9/16 19 13-3/16 19-5/8
14-3/16 (subbase not required) (319) (483) (335) (498)
(360) Downflow Applications on Combustible Flooring 11-13/16 19 13-7/16 20-5/8
Downflow Applications on Combustible Flooring with Coil END4X, 12-5/16 19 13-5/16 20
ENW4X or Coil Casing NAEA (subbase not required) (319) (483) (338) (508)
Upflow Applications on Combustible or Noncombustible Flooring 16 21-5/8 16-5/8 22-1/4
Downflow Applications on Noncombustible Flooring 15-7/8 19 16-1/2 19-5/8
17-1/2 (subbase not required) (403) (483) (419) (498)
(445) Downflow Applications on Combustible Flooring 15-1/8 19 16-3/4 20-5/8
Downflow Applications on Combustible Flooring with Coil END4X, 15-1/2 19 16-1/2 20
ENW4X or Coil Casing NAEA (subbase not required) (394) (483) (419) (508)
Upflow Applications on Combustible or Noncombustible Flooring 19-1/2 21-5/8 20-1/8 22-1/4
Downflow Applications on Noncombustible Flooring 19-3/8 19 20 19-5/8
21 (subbase not required) (492) (483) (508) (498)
(533) Downflow Applications on Combustible Flooring 18-5/8 19 20-1/4 20-5/8
Downflow Applications on Combustible Flooring with Coil END4X, 19 19 20 20
ENW4X or Coil Casing NAEA (subbase not required) (483) (483) (508) (508)
Upflow Applications on Combustible or Noncombustible Flooring 23 21- 1/8 23-5/8 22-1/4
Downflow Applications on Noncombustible Flooring 22- 7/8 19 23-1/2 19-5/8
24-1/2 (subbase not required) (581) (483) (597) (498)
(622) Downflow Applications on Combustible flooring 22-1/8 19 23-3/4 20-5/8
Downflow Applications on Combustible Flooring with Coil EN D4X, 22-1/2 19 23-1/2 20
ENW4X or Coil Casing NAEA (subbase not required) (572) (483) (597) (508)
APPLICATION
(subbase not required) (322) (549) (338) (565)
(subbase required) (284) (483) (34t) (600)
(subbase not required) (406) (549) (422) (565)
(subbase required) (384) (483) (425) (600)
(subbase not required) (495) (549) (511) (565)
(subbase required) (473) (483) (514) (600)
(subbase not required) (584) (537) (600) (565)
(subbase required) (562) (483) (603) (600)
PLENUM OPENING FLOOR OPENING
A B C D
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 02 13
Table 5--Air Delivery - CFM (with Filter)*
FURNACE RETURN-AIR SPEED EXTERNAL STATIC PRESSURE (in, w,c,)
SIZE INLET 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0
0451408A or Med-Low 865 830 790 745 690 625 545 440 250 195
0451412A or Med-Low 1360 1300 1240 1175 1115 1040 950 850 725 575
0701408A or Med-Low 835 815 790 755 710 660 590 480 325 205
0701412A or M ed-Low 1320 1280 1240 1205 1140 1075 995 905 790 620
0701716A or Med-Low 1550 1520 1475 1430 1375 1310 1240 1155 1070 970
0901714B or Med-High 1515 1485 1440 1380 1300 1220 1115 990 830 600
0902116A or Med-Low 1740 1700 1650 1590 1525 1440 1335 1195 1010 820
0902120A or M ed-Low 2230 2170 2110 2050 1985 1890 1780 1660 1525 1360
1101712A or Med-Low 1475 1435 1395 1335 1285 1185 1070 890 725 450
1102116A or Med-Low 1745 1710 1650 1560 1450 1340 1205 1090 865 605
1102122A or Med-Low 2140 2100 2050 1990 1935 1865 1760 1670 1545 14t0
1352116A or Med-Low 1790 1755 1705 1640 1550 1465 1295 1145 945 775
1352422A or Side & Med-Low 2120 2075 1995 1970 1905 1835 1735 1645 1515 1325
1552420A or Med-Low 2155 2125 2075 2015 1935 1830 1780 1635 1485 1365
* A filter is required for each return-air inlet.Airflow performance included 3/_-in, (19mm) washable filter media such as contained infactory-authorized accessory
filter rack. Todetermine airflow performance without this filter,assume an additional 0.1 in. w.c. available external static pressure.
-- Indicates unstable operating conditions.
Bottom High 1035 995 945 895 835 770 675 565 390 195
Side(s) Low 760 720 680 635 580 520 445 345 220 195
Bottom High 1440 1375 1305 1240 1160 1070 975 870 730 560
Side(s) Low 1250 1210 1160 1100 1040 965 885 790 670 520
Bottom High 1030 1005 965 925 870 810 740 645 465 280
Side(s) Low 725 700 675 635 595 545 460 350 250 --
Bottom High 1425 1375 1320 1265 1200 1125 1035 940 830 655
Side (s) Low 1200 1175 1145 1105 1050 990 920 840 725 555
Bottom High 1755 1700 1635 1505 1570 1435 1350 1260 1160 1055
Side(s) Low 1355 1340 1310 1280 1240 1190 1125 1060 975 890
Bottom High 1650 1600 1535 1465 1385 1285 1175 1055 895 645
Side(s) Low 1205 1180 1160 1120 1065 1005 925 810 630 510
Bottom High 1940 1880 1805 1720 1635 1540 1425 1290 1090 830
Side(s) Low 1505 1505 1480 1440 1375 1300 1190 1045 890 740
Bottom Only M ed-Low 2170 2110 2040 1970 1895 1785 1675 1565 1420 1260
Both Sides High 2530 2450 2365 2270 2165 2065 1940 1805 1670 1505
1 Side & Bottom Low 1895 1890 1845 1815 1755 1685 1600 1480 1350 1180
1 Side Only Med-Low 2105 2145 2070 2010 1940 1845 1735 1620 1475 1325
Bottom High 1600 1550 1490 1425 1355 1260 1135 990 785 530
Side(s) Low 1315 1295 1265 1220 1155 1080 985 810 675 440
Bottom High 1980 1915 1835 1750 1655 1495 1365 1185 965 700
Side(s) Low 1530 1515 1470 1400 1310 1215 1095 990 830 670
Bottom Only Med-Low 2135 2100 2060 2000 1930 1860 1765 1670 1555 1425
Bottom, Sides High .... 2355 2285 2190 2090 1965 1850 1705 1535
1 Side & Bottom Low 1855 1840 1815 1775 1725 1675 1600 1510 1405 1290
1 Side Only M ed-Low 2030 2025 2000 1950 1905 1850 1750 1660 1555 1425
Bottom High 2065 2000 1930 1835 1710 1590 1420 1235 1025 835
Side (s) Low 1480 1480 1480 1450 1380 1295 1160 1005 855 670
Bottom Only M ed- Low 2130 2080 2025 1960 1880 1795 1690 1550 1405 1255
Bottom, Sides High .... 2355 2280 2160 2065 1930 1805 1655 1465
Bottom Low 1860 1830 1800 1755 1725 1630 1530 14t5 1280 1140
1 Side Only M ed-Low 2070 2015 1970 1935 1855 1765 1655 1550 1445 1265
Bottom Only M ed-Low 2115 2095 2055 2005 1940 1845 1820 1675 1525 1390
Both Sides High .... 2375 2285 2185 2105 1995 1870 1720 1555
1 Side & Bottom Low 1800 1790 1770 1735 1695 1640 1570 1465 1345 1225
1 Side Only Med-Low 2140 2085 2020 1950 1850 1745 1695 1545 14t5 1290
Med-Low 1385 1360 1320 1260 1195 1120 1025 915 710 565
High 2405 2310 2220 2130 2025 1920 1790 1660 1530 1350
Low 1920 1875 1835 1780 1715 1630 1535 1420 1275 1135
High 2475 2395 2300 2200 2090 1985 1865 1730 1585 1425
Low 1850 1860 1810 1770 1715 1650 1555 1445 1310 1150
High 2485 24t 5 2340 2255 2160 2060 1950 1840 1720 1565
Low 1855 1840 1815 1775 1725 1675 1600 1510 1405 1290
High 2495 2440 2370 2290 2205 2120 2015 1910 1775 1625
Low -- 1735 1725 1695 1650 1595 1535 1455 1335 1230
High 2445 2365 2280 2190 2085 1980 1850 1705 1520 1355
Low 1860 1830 1800 1755 1705 1630 1530 14t5 1280 1140
High .... 2215 2130 2030 1920 1795 1675 1540 1385
Low 1860 1830 1800 1755 1725 1630 1530 14t5 1280 1140
High 2465 2430 2375 2305 2215 2110 2000 1865 1715 1530
Low 1800 1790 1770 1735 1695 1640 1570 1465 1345 1225
High .... 2260 2180 2070 1975 1865 1740 1595 1440
Low 1800 1790 1770 1735 1695 1640 1570 1465 1345 1225
14 441 01 1402 02
Figure 14 - Duct Flanges
UPFLOW
YES
/ t\ /\
120'_ YES 120°_ YES 120°_
MIN MIN MIN
NO NO NO
DOWNFLOW HORIZONTAL
I ......
YES
Figure 15 - Horizontal Unit Suspension
4 REQ,
/ /4" (6mm) THREADED ROD
YES
YES
A02020
/
OUTER DOOR
ASSEMBLY
c.
8" (203mm) MtN
FOR DOOR REMOVAL
(2) HEX NUTS, (2) WASHERS & (2) LOCK WASHERS
REQ. PER ROD
SECURE ANGLE
IRON TO BOTTOM
OF FURNACE WITH
3 #8 x3/4'' (19mm) SCREWS
TYPICAL FOR 2 SUPPORTS
1" (25ram) SQUARE, 1-1/4"x1-1/4"x1/8" (32x32x3mm)
ANGLE IRON OR UNI-STRUT MAY BE USED
A10130
441 01 1402 02 15
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