ICP F8MTL, G8MTL Installation Insrtuctions

These instructions must be read and understood completely before attempting installation.

Safety Labeling and Signal Words

DANGER, WARNING, CAUTION, and NOTE

The signal words DANGER, WARNING, CAUTION, and NOTE

are used to identify levels of hazard seriousness. The signal word

Signal Words in Manuals

The signal word WARNING is used throughout this manual in the
following manner:

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.

The signal word CAUTION is used throughout this manual in the
following manner:

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.

Signal Words on Product Labeling

Signal words are used in combination with colors and/or pictures

CAUTION - Hazards or unsafe practices which may result in or product labels.
minor personal injury or product or property damage, z_ Safety-alert symbol

NOTE - Used to highlight suggestions which wilt result in en-

When you see this symbol on the unit and in instructions or manu-

hanced installation, reliability, or operation, ats, be alert to the potential for personal injury.

TABLE OF CONTENTS

SAFETY CONSIDERATIONS ........................................ 3

INTRODUCTION .................................................. 4

CODES AND STANDARDS ......................................... 4

Safety .......................................................... 4

General Installation ............................................... 4

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 PROCEDURE .... 5

LOCATION ....................................................... 6

AIR FOR COMBUSTION AND VENTILATION .......................... 7

INSTALLATION ................................................... 10

Upflow Installation ............................................. 10

Downflow Installation .......................................... 10

Horizontal Installation ........................................... 11

Filter Arrangement ............................................ 14

Air Ducts .................................................... 14

Gas Piping ................................................... 16

Electrical Connections ......................................... 18

Venting ...................................................... 22

START-UP, ADJUSTMENT, AND SAFETY CHECK .................... 31

General ....................................................... 31

Start-Up Procedures ............................................ 31

Adjustments ................................................... 32

Check Safety Controls ........................................... 36

Checklist ...................................................... 36

SERVICE AND MAINTENANCE PROCEDURES .................... 40

Introduction .................................................. 40

Care and Maintenance ......................................... 41

Sequence of Operation ........................................ 45

Wiring Diagrams .............................................. 48

Troubleshooting .............................................. 49

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.

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 .

IS0 9001

Portions of the text and tables are reprinted from NFPA 54/ANSI Z223.1-20096), with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washington,
DO 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.

Printedin U.S.A. 441 01 2101 02 Aug. 2012

INSTALLER: Affixthese instructions on or adjacent tothe furnace.
CONSUMER: Retain these instructions for future reference.

I-- 5 16/16
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Figure 1 - Dimensional Drawing

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BOTrOM RE11JRN [11kl]

WIDTH

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.

VEHTING(6PLACE8)

[511O1

81DEINLET

(BOTHSlDF.m

Table 1 - Dimensions

A

FURNACE SIZE

0451412
0701412
0901714

1102122

1352422

135size furnace require a 5-in. or 6-in. (127 or 152mm) vent. Use a vent adapter between furnace and vent stack.

CABINET WIDTH

IN (mm)

14-3/16 (360)
14-3/16 (360)

17-1/2 (445)

21 (533)

24-1/2 (622)

OUTLET WIDTH

IN (rnm)

12-9/16 (319)
12-9/16 (319)

15-7/8 (403)
19-3/8 (492)

22-7/8 (581)

TOP AND BOTTOM

C

FLUE COLLAR

IN (mm)

9-5/16 (237)

9-5/16 (237)
11-9/16 (294)
13-5/16 (338)

15-1/16 (383)

D

BOTTOM INLET

WIDTH

IN (mm)

12-11/16 (322)
12-11/16 (322)

16 (406)

19-1/2 (495)

23 (584)

_A

1 [_1._]
p_4]

VENT

CONNECTION

SIZE

IN (mm)

4 (102)
4 (102)

4 (102)
4 (102)

4 (102)*

L11/4

SHIP

WT

LB (KG)

107 (49)
115 (52)

127(58)

152 (69)
163 (74)

2

441 01 2101 02

SAFETY CONSIDERATIONS

FIRE, EXPLOSION, ELECTRICAL SHOCK, AND
CARBON MONOXIDE POISONING HAZARD

Failure to follow this warning could result in
dangerous operation, serious injury, death, or
property damage.

Improper installation, adjustment, alteration, service,
maintenance, or use could 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

Improper installation or misapplication of furnace may
require excessive servicing or cause premature
component failure.

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

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.

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
instructions.

5. Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections, as

specified in the "Gas Piping" section.

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

which has an external static pressure within the
allowable range, as specified in 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
garage 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 2 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

inches (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, EN24X or

when the manufacturer's coil casing model number
NAEA is used. See Figure2 for clearance to

combustible construction information.

441 01 2101 02 3

INTRODUCTION

F8MTL & G8MTL 4-way multipoise Category I fan-assisted

furnace is CSA (formerly A.G.A. and C.G.A.) 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.
These furnaces shall not be installed directly on carpeting,

tile, or any other combustible material other than wood
flooring. For downflow installations, a factory accessory floor

base must be used when installed on combustible materials
and wood flooring. This special base is not required when this

Figure 2 - Clearances to Combustibles

furnace is installed on the manufacturer's coil model numbers
END4X, ENW4X, or when the manufacturer's coil casing

model number NAEA is used. See Figure 2 for clearance to
combustible material information.

This furnace is designed for minimum continuous return-air
temperature of 60°F (16°O) db or intermittent operation down

to 55_'F (13°O) 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. (SeeFigure 3)

For accessory installation details, refer to the applicable
instruction literature.

NOTE: Remove all shipping brackets and materials before
operating the furnace.

Improper adjustment, alteration, service,
maintenance, or installation can cause

serious injury or death,

Read and follow instructions and
precautions in User's Information Manual

provided with this furnace. Installation
and service must be performed by a
qualified service agency or the gas

supplier.

_k. CAUTION

Check entire gas assembly for leaks after
lighting this appliance,

I INSTALLATION

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
provisions 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

I INSTALLATION

This forced air furnace is This furnace is approved for

equipped for use with natural UPFLOW, DOWNFLOW, and
gas at altitudes 0 - 10,000 ft Clearancearrows

(O - 3,050m), do not changewith

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 Vent Clearance to combustibles:
vented in common with other For SingleWallvents 6 inches (6 pc).

gas fired appliances. ForType B-1 vent type 1 inch (1 pc).

MINIMUM INCHES CLEARANCE TO

COMBUSTIBLE CONSTRUCTION

DOWNFLOW POSITIONS:

1" Installation on non-combustible floors only.

For Installation on combustible flooring only when installed on special
base, Part No. KGASB0201ALL or NAHA01101SB, Coil Assembly,
Part No. CAR, CAP, CNPV, CNRV, END4X, ENW4X, WENC, WTNC,
WENW OR WTNW.

18 inches front clearance required for alcove.

"k 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.

HORIZONTAL installations.

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 m 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 m 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

4 441 01 2101 02

for only the NFGC, contact the American Gas Association,
400 N. Capitol Street, N.W., Washington DC 20001

(www.AGA.org)

Figure 3 - Return Air Temperature

- - MAX 80 °F/27 °C

FRONT

MIN 60°F/16°0

A06745

Step 3 m Combustion and Ventilation Air
Section 9.3 of the NFGC, NFPA 54/ANSI Z223.1-2009 Air

for Combustion and Ventilation
Step 4 m 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

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

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.

Figure 4 - Multipoise Orientations

THE BLOWER IS LOCATED

TO THE RIGHT OF THE

BURNER SECTION, AND

AIR CONDITIONED AIR IS

DISCHARGED TO THE LEFT.

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 uninstatled
(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.

FURNACE RELIABILITY HAZARD

Improper installation or service of furnace may cause
premature furnace component failure.

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.

AIRFLOW

THE BLOWER IS

LOCATED BELOW THE

BURNER SECTION, AND

CONDITIONED AIR IS

DISCHARGED UPWARD.

THE BLOWER IS

LOCATED ABOVE TH E

BURNER SECTION, AND

CONDITIONED AIR IS

DISCHARGED DOWNWARD

441 01 2101 O2 5

\

HORIZONTAL RIGHT [_>

AIRFLOW

LOCATED TO THE LEFT

OF THE BURNER SECTION,

AND CONDITIONED AIR IS

THE BLOWER IS

DISCHARGED TO THE RIGHT.

A02097

LOCATION

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.

NOTE: For high-attitude installations, the high-altitude

conversion kit MUST be installed at or above 5500 ft. (1676

M) above sea level. Obtain high-attitude conversion kit from

your area authorized distributor.
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 upftow applications. Downflow

installations require use of a factory-approved floor base,
coil model numbers END4X, ENW4X, or the manufacturer's
coil casing model number NAEA, when installed on
combustible materials or wood flooring (refer to SAFETY
CONSIDERATIONS).

• be located close to the chimney or vent and attached to an
air distribution system. Refer to Air Ducts section.

• be provided ample space for servicing and cleaning. Always

comply with minimum fire protection clearances shown on

the furnace clearance to combustible construction 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

• 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.

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 inches (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 NFGC. (See
Figure 5)

Figure 5 - Installation in a Garage

CARBON MONOXIDE POISONING AND UNIT

DAMAGE HAZARD

Failure to follow this warning could result in personal
injury or death, and furnace 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.

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

• Water softening chemicals

18-iN. (457.2 mm)

MINIMUMTO 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)

6 441 01 2101 02

Figure 6 - Prohibit Installation on Back

AIR FOR COMBUSTION AND

VENTILATION

Provisions for adequate combustion, ventilation, and dilution
air must be provided in accordance with:
U.S. installations: Section 9.3 of the NFPA 54 /A ANSI
Z223.1-2009, Air for Combustion and Ventilation, and
applicable provisions of the local building codes.

BACK J

A02054

PROPERTY DAMAGE HAZARD

Improper use or installation of this furnace may cause
premature component failure. This gas furnace may be
used for construction heat 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 roll-out 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.

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.

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.

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 cubic feet per 1,000 Btuh input rating

for atl gas appliances installed in the space.

• Spaces having less than 50 cubic feet per 1,000 Btuh
require the Outdoor Combustion Air Method.

• Spaces having at least 50 cubic feet 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.

2. Figure 7 illustrates how to provide TWO OUTDOOR
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 -in 2 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.

441 01 2101 O2 7

d. TWO OPENINGS OR VERTICAL DUCTS require 1

-in 2 of free area per 4,000 Btuh (550 mm2/kW) for

b. Not less than the sum of the areas of all

connectors in the space.

combined input of all gas appliances in the space per

Figure 7 and Table 2

3. ONE OUTDOOR OPENING requires:
a. One 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

Table 2 - Minimum Free Area Required for Each Combustion Air opening of Duct to Outdoors

TWO HORIZONTAL DUCTS SINGLE DUCT OR OPENING TWO OPENINGS OR VERTICAL DUCTS

FURNACE (1 SQ. IN./2,O00 BTUH) (1,100 SQ. MM/KW) (1 SQ. IN./3,O00 BTUH) (734 SQ. MM/KW) (1 SQ. IN./4,O00 BTUH) (550 SQ. MM/KW)

INPUT Free Area of Opening Round Duct Free Area of Opening Round Duct Free Area of Opening Round Duct

(BTUH) and Duct Dia. and Duct Dia. 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 (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 (28387) 8 (203) 33 (21290) 7 (178)

EXAMPLES: Determining Free Area

FURNACE WATERHEATER 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

vent

Figure 7 - Air for Combustion, Ventilation, and Dilution

for Outdoors

1 SQ IN.

SQ IN.
PER

400O

BTUH*

cO
rr

8

GI

o

1 SQ IN.

PER

4OOO

BTUH*

12" (305mm)
MAX

(305mm) 12" MAX

1 SQIN. A
PER 2000
BTUH*

DUCTS

TO

OUTDOORS

1 SQ IN.
PER 2000

BTUH*

(305mm) 12" MAX

DUCT,' PER 4000

TO BTUH*

OUTDOORS

D 12_X (305mm)

VENT
THROUGH

ROOF

i

I

CIRCULATING AIR DUCTS

TO PER 4O00

OUTDOORS BTUH*

*Minimum dimensions of 3-in. (76 mm).

Note: Use any of the following combinations of openings:

A&BC&DD&EF&G

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.

1 SQ IN.

A03174

Figure 8 - Air for Combustion, Ventilation, and Dilution

from Indoors

DUCTS

CIRCULATING AiR !

I I I I I
I I I I I

I I I I I

INTERIOR

HEATED

SPACE

i i

CIRCULATING AIR DUCTS

* Minimum opening size is 100 sq in. (64516 sq. mm) with minimum dimensions of
3 in. (76 ram)

1 Minimum of 3 in. (76 mm) when type-B1 vent is used.

VENT THROUGH ROOF

12" AX(305mm)

o *

_ 1 SQ IN.

• PER 1000
BTUH* iN DOOR
ORWALL

UNCONFINED
SPACE

6" MIN (152mm)
(FRONT)0

1 SQ iN.
PER 1000

_: BTUH* iN DOOR

_-----OR WALL

12" MAX (305mm)

A03175

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.

8 441 01 2101 02

CARBONMONOXIDE 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.

The Standard Method:

1. The space has no less volume than 50 cubic feet per
1,000 Btuh of the maximum input ratings for all gas

appliances installed in the space and

Table 3 - Minimum Space Volumes for 100% Combustion, Ventilation, and Dilution from Indoors

OTHER THAN FAN-ASSISTED TOTAL FAN-ASSISTED TOTAL

ACH

0.60 1,050

0.50 1,260

0.40 1,575

0.30 2,100

0.20 3,150

0.10 6,300

0.00 NP

ACH =Air Changes/Hour
NP = NotPermitted

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 _ 21ft3 (f= [other ='_

2. For fan-assisted appliances such as this furnace:

Volume

If:

Iother

= combined input of all other than fan-assisted

Ifan

= combined input of all fan-assisted appliances in

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 opening

shall have free area of at least 1 in.2/1,000 Btuh (2,000
mm2/kW) of the total input rating of all gas appliances

in the space, but not less than 100 in.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

(1,000s BTUH GAS INPUT RATE) (1,000s BTUH GAS INPUT RATE)

30 40 50 44 66 88 110 132 154

S _ace Volume (ft.3)

1,400 1,750 1,100 1,650 2,200 2,750 3,300 3,850

1,680 2,100 1,320 1,980 2,640 3,300 3,960 4,620
2,100 2,625 1,650 2,475 3,300 4,125 4,950 5,775
2,800 3,500 2,200 3,300 4,400 5,500 6,600 7,700
4,200 5,250 3,300 4,950 6,600 8,250 9,900 11,550
8,400 10,500 6,600 9,900 13,200 16,500 19,800 23,100

NP NP NP NP NP NP NP NP

Other ACH _000 Btu/hrJ

A04002

FaR

ACH 000 Btu/hrJ

A04003

appliances in Btuh/hr

Btuh/hr

2. The air infiltrationrate 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

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

space.

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.2/1,000 Btuh (4,400
mm2/kW) of total input rating of all gas appliances.

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 include

joints around window and door frames, between sole

plates and floors, between wall-ceiling 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

Combustion Air Method below and,

441 01 2101 02 9

2.Outdooropeningsshallbelocatedasrequiredinthe
Outdoor CombustionAir Methodmentioned

previouslyand,

3.Outdooropeningsshallbesizedasfollows:

a.CalculatetheRatioofallIndoorSpacevolumedivided

by requiredvolumefor IndoorCombustionAir

Methodbelow.

b.OutdooropeningsizereductionFactoris1minusthe

Ratioina.above.

c.MinimumsizeofOutdooropeningsshallbethesize

requiredinOutdoorCombustionAirMethodabove

multipliedby reductionFactorin b. above.The
minimumdimensionofairopeningsshallbenotless

than3in.(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
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 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.

Figure 9 - Removing Bottom Closure Panel

o

o

I

BOTTOM
CLOSURE

PANEL

BOTTOM
FILLER PANEL

Levelinq Leqs (If Desired)

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 in

Step 1 above.
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.

Figure 10 - Leveling Legs

(Smm)

1

(44ram)

I 3/4"

(44mm)

(Smm)

(Smm)

(44mm) 1 3/4"

(44mm) 1

A89014

DOWNFLOW INSTALLATION
NOTE: For downflow applications, this furnace is approved

for use on combustible flooring when any one of the following
two accessories are used:

• Downflow combustible floor subbase

• Coil model numbers 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 13.

3. Construct plenum to dimensions specified in Table 4

and Figure 13.

4. If downflow subbase is used, install as shown in
Figure 11. If coil model numbers END4X, ENW4X or

coil casing model number NEAE is used, install as
shown in Figure 12.

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 casing. 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)

10 441 01 2101 02

Figure 11 - Furnace, Plenum, and Subbase installed on

a Combustible Floor

FURNACE

(OR COIL CASING

WHEN USED)

COMBUSTIBLE

FLOORING

SUBBASE

SHEET METAL

PLENUM

FLOOR

OPENING

HORIZONTAL INSTALLATION

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.

Figure 13 - Floor and Plenum Opening Dimensions

A96283

A96285

Figure 12 - Furnace, Plenum, and Coil or Coil Casing

Installed on a Combustible Floor

FURNACE

APPROVED

COIL ASSEMBLY

OR

COIL BOX

_ COMBUSTIBLE

FLOORING x

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 two(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.

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.

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

two (2) #8 x 3/4-in. (19 mm) screw into the side and 2 #8 x

3/4-in. (19 mm) screw 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 crawlspace 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 ram) piece
of sheet metal for flame roll-out protection in front of burner

area for furnaces closer than 12 inches (305 mm) above the

441 01 2101 02 11

combustibledeckorsuspendedfurnacescloserthan12

inches(305mm)tojoists.ThesheetmetalMUSTextend

underneaththefurnacecasingby1in.(25mm)withthedoor

removed.

Thebottomclosurepanelonfurnacesofwidths17-1/2in.

(445mm)andlargermaybe usedfor flameroll-out

protectionwhenbottomof furnaceis usedfor returnair
connection.SeeFigure17forproperorientationofroll-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 two (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) are used without a bottom

return air inlet.

FURNACE

CASING

WIDTH

14-3/16

(376)

17-1/2

(445)

21

(533)

24-1/2

(622)

Table 4 - Opening dimensions - In.

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 with Coil

END4X, ENW4X or Coil Casing NAEA (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)

Figure 14 - Duct Flanges

U PFLOW DOWN FLOW

(mm)

PLENUMOPENING

A B

12-11/16 21-5/8

(322) (549)

12-9/16 19

(319) (483)

11-13/16 19

(284) (483)

12-5/16 19

(319) (483)

16 21-5/8

(406) (549)

15- 7/8 19

(403) (483)

15-1/8 19

(384) (483)

15-1/2 19

(394) (483)

19-1/2 21-5/8

(495) (549)

19-3/8 19

(492) (483)

18-5/8 19

(473) (483)

19 19

(483) (483)

23 21-1/8

(584) (537)

22- 7/8 19

(581) (483)

22-1/8 19

(562) (483)

22-1/2 19

(572) (483)

HORIZONTAL

FLOOR OPENING

C D

13-5/16 22-1/4

(338) (565)

13-3/16 19-5/8

(335) (498)

13-7/16 20-5/8

(34t) (600)

13-5/16 20

(338) (508)

16-5/8 22-1/4

(422) (565)

16-1/2 19-5/8

(419) (498)

16-3/4 20-5/8

(425) (600)

16-1/2 20

(419) (508)

20-1/8 22-1/4

(511) (565)

20 19-5/8

(508) (498)

20 - 1/4 20- 5/8

(514) (600)

20 20

(508) (508)

23 - 5/8 22- 1/4

(600) (565)

23-1/2 19- 5/8

(597) (498)

23-3/4 20-5/8

(603) (600)

23 - 1/2 20

(597) (508)

12 441 01 2101 02

YES

YES YES

NO Q/1 NO

YES

YES

120o\ YES

MIN

NO

A02020

Figure 15 - Horizontal Unit Suspension

4 REQ.

UTER DOOR

ASSEMBLY

c.

8" (203mm) MIN
FOR DOOR REMOVAL

(2) HEX NUTS, (2) WASHERS & (2) LOCK WASHERS
REQ. PER ROD

l _/// 1/4" (6mm) THREADED ROD

SECURE ANGLE
IRON TO BOTTOM

OF FURNACE WiTH
3 #8 xS/4'' (19ram) SCREWS

TYPICAL FOR 2 SUPPORTS

1" (25mm) SQUARE, 1-1/4"xl-1/4"xt/8" (32x32x3mm)

ANGLE IRON OR UNI-STRUT MAY BE USED

J

Figure 16 - Horizontal Suspension with Straps

OUTER DOOR

ASSEMBLY X III I

IIII

22 GAUGE GALVANIZED
STRAPS TYPICAL

FOR 4 STRAPS

F

AIR

/OPENING

METHOD 2
USE (4) #8 x 3/4 (19 ram) SHEET

METAL SCREWS FOR EACH
STRAR THE STRAPS
SHQULD BE VERTICAL
AGAINST THE FURNACE
SIDES AND NOT PULL AWAY

FROM THE FURNACE
SIDES.

BACK OF
FURNACE

METHOD 1
FOLD ALL STRAPS UNDER

FURNACE AND SECURE WTH
(4) #8 x 3/4 (19 ram) SHEET METAL SCREWS
(2 SCREWS IN SIDE AND 2 SCREWS

IN BOTTOM).

A10130

AIR OPENING

441 01 2101 02 13

A10131

Figure 17 - Typical Attic Installation

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.

ENTRY

EQUIPMENT MANUAL

SHUT-OFF GAS VALVE

SEDIMENT UNION

TRAP

Not all horizontal furnaces are approved for side return air

connections. (See Figure 20)

FILTER ARRANGEMENT

CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal

injury, or death.
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.
Refer to the instructions supplied with the external filter rack

for assembly and installation options.

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.

17 3/4" (451 mm)OVERALL
4 3/4" (121mm) UNDER DOOR

1" (25mm) UNDER FURNACE

VENT

30-IN. (762mm)

MIN WORKAREA *WHEN USED WITH

EXTEND OUT 12" (305mm)
FROM FACE OF DOOR

SINGLE WALL VENT
CONNECTIONS

A10164

NOTE: Flexible connections should be used between
ductwork and furnace to prevent transmission of vibration.

Ductwork passing through unconditioned space should be
insulated 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 _'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.

Upflow and Horizontal Furnaces
Connect supply-air duct to flanges on furnace supply-air

outlet. Bend flange upward to 90 ° with wide duct pliers. (See
Figure 14) The supply-air duct must be connected to ONLY

the furnace supply-outlet-air duct flanges or air conditioning
coil casing (when used). DO NOT cut main furnace casing

side to attach supply air duct, humidifier, or other accessories.
All accessories MUST be connected to duct external to

furnace main casing.

A02329

14 441 01 2101 02

Table 5 - Air Delivery - CFM (With Filter)*

FURNACE

SIZE

0451412

0701412

0901714

1102422

1352422

rack. To determine airflow performance without this filter, assume an additional 0.1 In. W.C. available external static pressure.

-- Indicates unstable operating conditions.

NOTE: For horizontal applications, the top-most flange may
be bent past 90 ° to allow the evaporator coil to hang on the
flange temporarily while the remaining attachment and
sealing of the coil are performed.

Downflow Furnaces
Connect supply-air duct to supply-air outlet on furnace. Bend

flange inward past 90 ° with wide duct pliers. (See Figure 14)
The supply-air duct must be connected to ONLY the furnace

supply outlet or air conditioning coil casing (when used).
When installed on combustible material, supply-air duct must

be connected to ONLY the accessory combustible floor
subbase or a factory approved air conditioning coil casing.
DO NOT cut main furnace casing to attach supply side air
duct, humidifier, or other accessories. All accessories MUST

be connected to duct external to furnace casing.

RETURN-AIR

INLET

Bottom or

Side(s)

Bottom or

Side(s)

Bottom or

Side(s)

Bottom Only

Bottom Sides or
1 Side & Bottom

1Side Only

Bottom

Only

Bottom Sides

or

1 Side & Bottom

1 Side Only

SPEED

High 1465 1400 1325 1250 1175 1085 980 860 725 560

Med-High 1295 1260 1210 1155 1090 1015 930 830 700 545

Medium 1150 1120 1085 1040 985 920 835 740 620 510

Med-Low 1030 1010 980 945 895 835 765 685 570 345

Low 860 835 810 780 745 700 635 555 445 260

High 1440 1400 1355 1300 1240 1170 1090 1000 890 745

Med-High 1180 1165 1150 1125 1085 1030 970 890 785 645

Medium 1015 1020 1010 990 965 925 875 800 700 560

Med-Low 885 885 880 865 845 815 770 700 605 475

Low 695 700 700 690 670 640 600 540 460 345

High 1650 1600 1535 1465 1385 1285 1175 1055 895 645

Med-High 1515 1485 1440 1380 1300 1220 1115 990 830 600

Med- Low 1385 1360 1320 1260 1195 1120 1025 915 710 565

Low 1205 1180 1160 1120 1065 1005 925 810 630 510

High 2530 2460 2380 2285 2200 2085 1970 1835 1695 1545

Med-High 2225 2190 2135 2075 1995 1910 1805 1695 1565 1430

Medium 1895 1885 1865 1820 1770 1700 1610 1520 1410 1290

Med-Low 1565 1555 1535 1505 1465 1410 1350 1265 1175 1050

Low 1320 1295 1265 1235 1205 1160 1105 1035 950 870

High .... 2415 2330 2235 2125 1995 1860 1735 1605

Med-High 2205 2175 2120 2065 1975 1900 1790 1685 1580 1460

High 2485 2430 2360 2270 2175 2070 1950 1825 1685 1535

Med-High 2155 2135 2100 2040 1970 1885 1790 1680 1560 1420

Medium 1830 1830 1810 1780 1730 1665 1595 1505 1395 1275

Med-Low 1520 1505 1490 1470 1430 1385 1330 1250 1165 1055

Low 1275 1260 1240 1210 1180 1135 1090 1025 930 840

High 2485 2400 2310 2215 2110 2000 1880 1725 1535 1355

Med-High 2195 2150 2090 2000 1920 1825 1720 1565 1405 1255

Med-Low 1880 1850 1820 1780 1715 1635 1540 1415 1290 1160

Low 1640 1635 1615 1585 1530 1465 1370 1255 1150 1040

High .... 2385 2305 2195 2085 1960 1825 1670 1465

Med-High 2180 2145 2060 2010 1945 1865 1765 1660 1515 1325

Med-Low 1880 1850 1820 1780 1715 1635 1540 1415 1290 1160

Low 1640 1635 1615 1585 1530 1465 1370 1255 1150 1040

High 2320 2250 2155 2055 1970 1855 1725 1600 1450 1280

Med-High 2125 2065 1995 1910 1815 1710 1610 1490 1340 1175

Med-Low 1845 1825 1765 1710 1650 1570 1475 1370 1240 1100

Low 1640 1620 1580 1540 1485 1410 1330 1220 1080 960

0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

EXTERNAL STATIC PRESSURE (IN.W.C.)

Downflow Furnaces

The return-air duct must be connected to return-air opening

(bottom inlet) as shown in Figure 1. DO NOT cut into casing
sides (left or right). Side opening is permitted for only upflow

and most horizontal furnaces. Bypass humidifier connections
should be made at ductwork or coil casing sides exterior to

furnace. (See Figure 19)

Upflow and Horizontal Furnaces

The return-air duct must be connected to bottom, sides (left

or right), or a combination of bottom and side(s) of main

furnace casing as shown in Figure 1. Bypass humidifier may

be attached into unused return air side of the furnace casing.
(See Figure 18 and Figure 20) Not all horizontal furnaces are
approved for side return air connections. (See Figure 20)

GAS PIPING

Return Air Connections

accessoryfilter*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

FIRE HAZARD

Failure to follow this warning could cause personal
injury, death and/or property damage.

Never connect return-air ducts to the back of the

furnace. Follow instructions below.

441 01 2101 02 15

FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal

injury, death, and/or property damage.
Never purge a gas line into a combustion chamber.

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.

FIRE OR EXPLOSION HAZARD

Failure to follow this warning could result in )ersonat
injury, death, and/or property damage.

Use proper length of pipe to avoid stress on gas
control manifold and a gas leak.

Figure 18 - Upflow Return Air Configurations and Restrictions

UPFLOW RETURN AiR CONFiGURATiONS AND RESTRICTIONS

AIR FLOW MODELS RETURN AIR RETURN AIR RETURN AIR RETURN AIR

GREATER *
5 TONS AND YES YES YES YES

ALL OTHER MODELS YES YES YES YES

• 2000 CFM AND GREATER AT .6 ESP HI COOLING SPEED

@

RETURN "i

AIR

RETURN

AiR

FIRE OR EXPLOSION HAZARD
Failure to protect gas valve inlet from water and

debris could result in death, personal injury and/or
property damage.

Gas valve inlet and/or inlet pipe must remain capped
until gas supply line is permanently installed to protect

the valve from moisture and debris. Also, install a

sediment trap in the gas supply piping at the inlet to

the gas valve.

CONNECTION 1 CONNECTION 2 CONNECTION 3 COMBINATIONS
ONLY ONLY ONLY OF 1,2, AND 3

RETURN / UPFLOW

AiR / RETURN AIR

RESTRICTIONS

Figure 19 - Downflow Return Air Configurations and Restrictions

,FI_ RETURN

_J AI R

RETURN

AIR AIR

DOWNFLOWRETURNAIRCONFIGURATIONSANDRESTRICq]ONS

AIR FLOW MODELS RETURN AIR RETURN AIR RETURN AIR RETURN AIR

5 TONS AND YES NO NO NO
GREATER *

ALL OTHER MODELS YES NO NO NO

• 2000 CFM AND GREATER AT .6 ESP HI COOLING SPEED

CONNECTION 1 CONNECTION 2 CONNECTION 3 COMBiNATiONS
ONLY ONLY ONLY OF 1, 2, AND 3

16 441 01 2101 02