ICP F9MAC0601714A1 User Manual GAS FURNACE Manuals And Guides 1307183L

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iiiiiii;i!i
_

i

iii

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 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.

Signal

Words

in Manuals

The signal word WARNING
this manual in the following

is used throughout
manner:

The signal word CAUTION
this manual in the following

is used throughout
manner:

DANGER - Immediate hazards which will result in
severe personal injury or death.
WARNING
- Hazards or unsafe practices which
could result in severe personal injury or death.

Signal

z_

Safety-alert

symbol

OF CONTENTS

SAFETY CONSIDERATIONS
..............................
INTRODUCTION
.........................................
CODES AND STANDARDS ................................
ELECTROSTATIC DISCHARGE (ESD) ......................
DIMENSIONS
...........................................
LOCATION ..............................................
LOCATION RELATIVE TO COOLING EQUIPMENT ...........
AIR FOR COMBUSTION AND VENTILATION ................
CONDENSATE TRAP ....................................
INSTALLATION
..........................................
UPFLOW INSTALLATION .................................
DOWNFLOW INSTALLATION ..............................
HORIZONTAL INSTALLATION .............................
FILTER ARRANGEMENT
.................................
AIR DUCTS .............................................
GAS PIPING .............................................
ELECTRICAL CONNECTIONS .............................
J-BOX INSTALLATION
...................................
VENTING ...............................................
SPECIAL VENTING REQUIREMENTS
FOR INSTALLATIONS IN CANADA ........................
DIRECT VENT / 2-PIPE SYSTEM ..........................
VENTILATED COMBUSTION AIR SYSTEMS ................
TERMINATION REQUIREMENTS
FOR THE
PROVINCES OF ALBERTA AND SASKATCHEWAN
.........
MAXIMUM EQUIVALENT VENT LENTH .....................
MAXIMUM ALLOWABLE EXPOSED VENT LENGTHS ........
MAXIMUM LENGTH OF UNINSULATED AND INSULATED ....

20001.

Labeling

When you see this symbol on the unit and in
instructions
or manuals,
be alert to the
potential for personal injury.

NOTE - Used to highlight suggestions
which will
result
in enhanced
installation,
reliability,
or
operation.

Portions

on Product

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

CAUTION
- Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.

TABLE

Words

of the text and tables are reprinted from NFPA 54/ANSI
This reprinted

material

Printed
inU.S.A.

is not the complete

Z223.1-2009_,

3
4
4
5
6
7
8
8
11
18
18
19
21
23
26
27
28
29
33
33
35
35

IS0 9001
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
.

INSTALLER: Affix these instructions on or adjacent to the
furnace.
CONSUMER:
Retain these instructions
for future
reference.

37
50
53
53

with permission

of National

Fire Protection

and official position of the NFPA or ANSI, on the referenced

subject,

Association,

Quincy, MA 02269 and American

which is represented

only

by the standard

Gas Association,

Washington,

in its entirety,

440 01 4201 03 July2012

DC

Required Notice for Massachusetts

Installations

Important
The Commonwealth

of Massachusetts

5.08: Modifications

to NFPA-54,

requires compliance

Chapter

with regulation 248 CMR as follows:

10

2) Revise 10.8.3 by adding the following additional requirements:

(a)

For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential
purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet
above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied:
INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side wall horizontal vented gas fueled equipment, the
installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back-up is installed on the floor
level where the gas equipment is to be installed. In addition, the installing plumber or gasfitter shall observe that a battery operated or hard wired
carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or structure served by the side wall
horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure the services of qualified license professionals
for the installation of hard wired carbon monoxide detectors.

1,

a. In the event that the side wall horizontally vented gas fueled equipment is installed in a crawl space or an attic, the hard wired carbon
monoxide detector with alarm and battery back-up may be installed on the next adjacent floor level.
b. In the event that the requirements of this subdivision can not be met at the time of completion of installation, the owner shall have a period of
thirty (30) days to comply with the above requirement; provided, however, that during said thirty (30) day period, a battery operated carbon
monoxide detector with an alarm shall be installed.

(b)

(c)

(d)

(e)

2.

APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the above provisions shall
comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.

3.

SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a minimum height of eight (8) feet
above grade directly in line with the exhaust vent terminal for the horizontally vented gas fueled heating appliance or equipment. The sign shall
read, in print size no less than one-half (1/2) inch in size, "GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS".

4.

INSPECTION. The state of local gas inspector of the side wall horizontally vented gas fueled equipment shall not approve the installation unless,
upon inspection, the inspector observes carbon monoxide detectors and signage installed in accordance with the provisions of 248 CMR
5.08(2)(a) 1 through 4.

EXEMPTIONS:

The following equipment

is exempt from 248 CMR 5.08(2)(a)

listed in Chapter 10 entitled "Equipment

1 through 4:

1.

The equipment
Board; and

Not Required To Be Vented" in the most current edition of NFPA 54 as adopted by the

2.

Product Approved side wall horizontally vented gas fueled equipment installed in a room or structure separate from the dwelling, building or
structure used in whole or in part for residential purposes.

MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED. When the manufacturer of Product Approved side wall
horizontally vented gas equipment provides a venting system design or venting system components with the equipment, the instructions provided by
the manufacturer for installation of the equipment and the venting system shall include:

1.

Detailed instructions for the installation of the venting system design or the venting system components;

2.

A complete parts list for the venting system design or venting system.

and

MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED. When the manufacturer of a Product Approved side
wall horizontally vented gas fueled equipment does not provide the parts for venting the flue gases, but identifies "special venting systems", the
following requirements shall be satisfied by the manufacturer:

1.

The referenced

"special venting system" instructions

shall be included with the appliance or equipment installation instructions;

2.

The "special venting systems" shall be Product Approved
installation instructions.

and

by the Board, and the instructions for that system shall include a parts list and detailed

A copy of all installation instructions for all Product Approved side wall horizontally vented gas fueled equipment, all venting instructions, all parts lists
for venting instructions, and/or all venting design instructions shall remain with the appliance or equipment at the completion of the installation.
For questions

regarding these requirements,

please contact the Commonwealth

Fitters, 239 Causeway

2

Specifications

of Massachusetts

Board of State Examiners of Plumbers and Gas

Street, Boston, MA 02114. 617-727-9952

are subject to change without notice.

440 01 4201 0,3

Rarefy Considerations
v

=

Read these instructions thoroughly and follow all warnings or
cautions included in literature and attached to the unit.

_=y

FIRE, EXPLOSION, ELECTRICAL SHOCK, AND CARBON
MONOXIDE POISONING HAZARD
Failure to follow this warning could result in dangerous
operation, 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.

FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
Solvent cements and primers are combustible. Keep away
from heat, sparks and open flame. Use only in well-ventilated
areas. Avoid breathing in vapor or allowing contact with skin
or eyes.

FURNACE RELIABILITY

HAZARD

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
g oves when hand ing parts, and servicing furnaces.
This is the safety-alert symbol /iX • When you see this symbol
on the furnace 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 a
hazard which could result in personal injury or death.
CAUTION is used to identify hazards which may result in minor
personal injury or product and property damage. NOTE and
NOTICE are used to highlight suggestions which wilt 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.

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.

6.

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,
local gas supplier, or your distributor or branch for information
or assistance. The qualified installer or agency must use only
factory-authorized
kits or accessories when modifying this
product. Refer to the individual instructions packaged with the
kits or accessories when installing.

7.

Installing and servicing heating equipment can be hazardous
due to gas and electrical components. Only trained and
qualified
personnel
should install, repair, or service
heating equipment.
Untrained personnel can perform basic
maintenance functions such as cleaning and replacing air
filters. All other operations must be performed by trained
service personnel. When working on heating equipment,
observe precautions in literature, on tags, and on labels
attached
to or shipped with furnace
and other safety
precautions that may apply.
These instructions cover minimum requirements and conform
to existing national standards and safety codes. In some
instances, these instructions exceed certain local codes and
ordinances, especially those that may not have kept up with
changing residential construction practices. We require these
instructions as a minimum for a safe installation.

8.

9.

10.

11.

Follow all safety codes. Wear safety glasses, protective
clothing, and work gloves. Have a fire extinguisher available.

440 01 4201 03

Specifications

subject

12.

to change

without

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.
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.
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.
A gas-fired furnace for installation in a residential
garage must be installed as specified in the warning box
in the "Location" section. (See Figure 4)
The furnace may be used for construction heat provided
that the furnace installation and operation complies with
the first CAUTION in the LOCATION section on page 7
of these instructions.
These Multipoise Gas-Fired
Furnaces are CSA
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.
See Table 1 for required clearances to combustible
construction.
Maintain a 1-in. (25 mm) clearance from combustible
materials to supply air ductwork for a distance of 36-in.

notice.

3

(914 mm) horizontally from the furnace. See NFPA 90B
or local code for further requirements.

1

REAR

0

FRONT (Combustion air openings in furnace and in structure)

1 (25)

Required for service

*24 (610)

All Sides of Supply Plenum
Sides

"1 (25)
0

Vent

0

_"

and Return

Air

MAX 80°F/27°C

SUPPLYAIR

FRONT

i°F

MIN 60°F/16°C

1 (25)

These furnaces SHALL NOT be installed directly on
carpeting, combustible tile, or any other combustible
material other than wood flooring. In downfiow
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 Assembly is used.
See Table 1 for clearance to combustible construction
information.

Introduction
The 4-way multipoise Category IV condensing furnace is CSA
design-certified
as a direct-vent
(2-pipe)
and ventilated
combustion
air venting installations.
(See Figure3)
The
furnace is factory-shipped
for use with natural gas. The
furnace can be converted in the field for use with propane gas
when a factory-supplied
conversion kit is used. Refer to the
furnace rating plate for conversion kit information.
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 (15°C) db or intermittent operation down to
55°F (15°C) db such as when used with a night setback
thermostat. Return-air temperature must not exceed 80°F
(27°C) db. Failure to follow these return-air temperature limits
may affect reliability of heat exchangers, motors, and controls
(See Figure 1)
The furnace should be sized to provide 100 percent of the
design heating load requirement plus any margin that occurs
because of furnace model size capacity increments. Heating
load estimates can be made using approved methods available
from Air Conditioning Contractors of America (Manual J);
American
Society
of
Heating,
Refrigerating,
and
Air-Conditioning
Engineers; or other approved engineering
methods. Excessive oversizing of the furnace could cause the
furnace and/or vent to fail prematurely.
For accessory installation details, refer to the applicable
instruction literature.
NOTE: Remove all shipping materials,
literature before operating the furnace.

Protection

CLEARANCE
In(mm)

POSITION

Top of Furnace
* Consult your local building codes.

I Freeze

Temperature

Minimum Clearances to
Combustible Materials for All Units

Table 1

13.

Figure

parts assemblies

and

32° F/0° C MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
A10490

J

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 and Canada, follow all codes and
standards for the following:

Safety
•

US: 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

•

CANADA: National Standard of Canada, Natural Gas
and Propane Installation Code (NSCNGPIC)
CAN/CSA B149.1-2010

General Installation
•

US: NFGC and the NFPA 90B. For copies, contact the
National Fire Protection Association Inc.,
Batterymarch Park, Quincy, MA 02269; or for only the
NFGC contact the American Gas Association, 400 N.
Capitol, N.W., Washington DO 20001.

•

CANADA: NSCNGPIC. For a copy, contact Standard
Sales, CSA International, 178 Rexdale Boulevard,
Etobicoke (Toronto), Ontario, M9W 1R3, Canada.

Combustion

and Ventilation

Air

US: Section 9.3 of the NFPA54/ANSI Z223.1-2009,
Air for Combustion and Ventilation
CANADA: Part 8 of the CAN/CSA B149.1-2010,
Venting Systems and Air Supply for Appliances

4

Specifications

subject

to change

without

notice.

440 01 4201

03

Duct Systems
•

US and CANADA: 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)
2005 Fundamentals Handbook Chapter 35.

Acoustical
Duct
•

Lining and Fibrous Glass

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.
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.).
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.
Use this procedure for installed and uninstatled
(ungrounded) furnaces.
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.
An ESD service kit (available from commercial sources)
may also be used to prevent ESD damage.

3.

US and CANADA: current edition of SMACNA, NFPA
90B as tested by UL Standard 181 for Class I Rigid Air
Ducts

4.

Gas Piping and Gas Pipe Pressure
Testing
•

U.S.A.: NFPA 54/ANSI Z223.1-2009, NFGC; Chapters
5, 6, 7, and 8 and national plumbing codes.

•

Parts 4, 5, 6 and

CANADA: CAN/CSA-B149.1-2010,
9.
In the state of Massachusetts:
•

This product must be installed by a licensed plumber or
gas fitter.

•

When flexible connectors are used, the maximum
length shall not exceed 36-in. (914 mm).

•

When lever type gas shutoffs are used they shall be
T-handle type.

•

The use of copper tubing for gas piping is not
approved by the state of Massachusetts.

6.

7.

Accessories
See Specification
product.

Electrical Connections

Table

•

U.S.A.: National Electrical Code (NEC) ANSI/NFPA
70-2011

•

CANADA: Canadian Electrical Code CSA C22.1

Electrostatic Discharge
Precautions Procedure

5.

2

QUANTITY

(ESD)

Sheets

for a list of accessories

Loose Parts Bag Contents
(shipped in blower compartment)
COMPONENT NAME

1

Air Intake Pipe Flange

1

Vent Pipe Flange

2

Coupling Flange Gaskets

10

Sharp Tip Screws (Vent and Inlet Flanges)

1

Vent Pipe Coupling

2
1

Vent Pipe Coupling Clamps
Rubber Drain Tube

FURNACE RELIABILITY HAZARD

4

Drain Tube Clamps

Failure to follow this caution may result in unit component
damage.

1
1

1/2" CPVC to 3/4" PVC Pipe Adapter
Gas Line Grommet

1

Junction Box Cover

1

Junction Box Base

1

Green Ground Screw

3
1

Blunt Tip Screws (Junction Box)
Thermostat Wire Grommet

Electrostatic discharge can affect electronic components.
Take precautions during furnace installation and servicing to
3rotect 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.

440 01 4201 03

Specifications

subject

for this

Provided separately in furnace
1

to change

without

IDrain Extension Tube - "Z" Pipe

notice.

5

Figure 2

1Dimensions

>

SD5060-4

(F/G9MAC)
FURNACE SIZE
0601714
0602120
0801714

WIDTH
17-1/2

(445)

21 (533)
17-1/2

D

C

(445)

OUTLET WIDTH
15-7/8

(403)

19-3/8

(492)

15-7/8

(403)

BOTTOM
INLET

WIDTH

16 (406)
19-1/2

(495)

16 (406)

AIR INTAKE

SHIP WT.
LB (KG)

8 3/4 (222)

154 (69)

10 1/2 (267)

159 (72)

8 3/4 (222)

164 (74)

0802120

21 (533)

19-3/8

(492)

19-1/2

(495)

10 1/2 (267)

169 (77)

1002122

21 (533)

19-3/8

(492)

19-1/2

(495)

10 1/2 (267)

179 (80)

22-7/8

(581)

12 1/4 (311)

203 (91)

Specifications

subject

1202422

6

A
CABINET

24-1/2

(622)

23 (584)

to change

without

notice.

440 01 4201 03

Location

PERSONAL
HAZARD

INJURY

AND/OR

PROPERTY

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 in Table 1 or on the furnace clearance to
combustible construction label.

DAMAGE

Improper use or installation of this furnace may result in
3remature furnace component failure. 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 roltout 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.

CARBON
MONOXIDE
DAMAGE HAZARD

-The filters used to clean the circulating air during the
construction process must be either changed or thoroughly
cleaned prior to occupancy.

The following types of furnace installations may require
OUTDOOR AIR for combustion due to chemical exposures:

General
These furnaces are shipped with materials to assist in proper
furnace installation. These materials are shipped in the main
blower compartment.
See Table 2 for loose parts bag contents.
This furnace must:

•

not be installed directly on any combustible material other
than
wood
flooring
(refer
to
SAFETY
CONSIDERATIONS).

440 01 4201 03

are protected

Specifications

subject

•

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:

-Verify proper furnace operating conditions including ignition,
gas input rate, air temperature rise, and venting according to
these installation instructions.

be installed so the electrical components
from water.

COMPONENT

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 atl local codes and
ordinances.

-The furnace, ductwork and filters are cleaned as necessary to
remove drywall dust and construction debris from atl HVAC
system components after construction is completed.

•

/

Failure to follow this warning could result in personal injury or
death and unit component damage.

-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.

POISONING

•
•

Permanent wave solutions
Chlorinated waxes and cleaners

•

Chlorine based swimming pool chemicals

•

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.

to change

without

notice.

7

Figure 3

1Multipoise

Orientations
AIRFLOW

0

THE BLOWER IS
LOCATED BELOW THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED UPWARD.

THE BLOWER IS LOCATED
TO THE RIGHT OF THE

BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED TO THE LEFT.

I

HORIZONTAL

RIGHT1AF F_LCW

THE BLOWER IS
LOCATED TO THE LEFT

THE BLOWER IS
LOCATED ABOVE THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED DOWNWARD.

OF THE BURNER SECTION,
AND CONDITIONED AIR IS
DISCHARGED TO THE RIGHT.

AIRFLOW

L12F010

Figure 5

_Prohibited

Installations

FIRE, INJURY OR DEATH HAZARD
Failure to follow this warning could result in personal
death and/or property damage.

injury,

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
or CAN/CSA
B149.1-2010. (See Figure 4)

Figure 4

BACK POSITIONED
DOWNWARD

,d

BACK POSITIONED
UPWARD

IR
RETURN
CUT IN
BACK

1Installation in a Garage

L12F011

Location Relative to Cooling
Equipment

18-1N. (457.2 mm)
MINIMUM
TO BURNERS

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.

A93044

Air for Combustion and
Ventilation

FIRE HAZARD
Failure to follow this warning could result in personal
death and/or property damage.

Introduction

injury,

Direct Vent (2-Pipe)

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 5)

8

Specifications

subject

Applications

When the furnace is installed as a direct vent (2-pipe) furnace,
no special provisions for air for combustion are required.
However, other gas appliances installed in the space with the
furnace may require outside air for combustion. Follow the
guidelines below to insure that other gas appliances have
sufficient air for combustion.
to change

without

notice.

440 01 4201 03

Ventilated

Combustion

Air Applications

When the furnace is installed using the ventilated combustion
air option, the attic or crawlspace must freely communicate with
the outdoor to provide sufficient air for combustion. The
combustion
air pipe cannot be terminated
in attics or
crawlspaces that use ventilation fans designed to operate
during the heating season. If ventilation fans are present in
these areas, the combustion air pipe must terminate outdoors
as a Direct Vent/2-Pipe system.
All air for combustion is piped directly to the furnace from a
space that is well ventilated with outdoor air (such as an attic,
crawlspace, or equipment closet) and the space is well isolated
from the living space or garage.
In addition, other gas
appliances installed in the space with the furnace may require
outside air for combustion. Follow the guidelines below to
insure that the roof or crawlspace walls have sufficient free
area to provide sufficient air for combustion and ventilation for
the furnaces. The guidelines below can be used to insure that
other gas appliances have sufficient air for combustion.
Provisions for adequate combustion, ventilation, and dilution air
must be provided in accordance with:
•
U.S. Installations:
Section 9.3 of the NFPA 54/ANSI
Z223.1-2009 , Air for Combustion and Ventilation and
applicable provisions of the local building codes.
•
Canadian
Installations:
Part
8
of
CAN/CSA-B149.1-2010,
Venting Systems and Air
Supply for Appliances
and all authorities
having
jurisdiction.

Figure

6

and for
Dilution
for Outdoors
lAir
Combustion,
Ventilation,
SQ

INI

TO
OUTDOORS

(305ram)

12" MAX

1 SQIN.

PER 2000

12_,X (305mrn)

_

BTUH*

1

1 SQ IN.
PER
4000
BTUH*
cO

nO
O

DUCTS
TO
OUTDOORS

rm
I--

O
SQ IN,
PER

4000
BTUH*
1 SO IN.
PER 2000
BTUH*
T
(305mm)

iiiil

12" MAX

(305mm)
CIRCULATING

AIR DUCTS
TO
OUTDOORS

*Minimum
dimensions
of 3-in. (76mm)
NOTE: Use any of the following
combinations
A&B,
C&D,
D&E,
F&G

Figure 7

I Combustion

I SQ IN,
PER 4000
BTUH*
Lt2F012

of openings:

Air Pipe

Point elbow down towards
back of furnace

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.

12" MINIMUM
256.0 mm

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 the Carbon Monoxide
Poisoning Hazard warning in the venting section of these
instructions to determine if an adequate amount of make-up air
is available.

440 01 4201 03

Specifications

subject

CASING SIDE ATTACHMENT
COMBUSTION AIR PIPE
(ATTIC, CRAWL SPACE, OR
EQUIPMENT
CLOSET ONLY.
See AIR FOR COMBUSTION
AND VENTILATION
Section)

to change

without

notice.

TOP PLATE ATTACHMENT
COMBUSTION AIR PIPE
(ATTIC, CRAWL SPACE, OR
EQUIPMENT CLOSET ONLY.
See AIR FOR COMBUSTION
AND VENTILATION

Section)
L12F014

9

Outdoor Combustion

Air Method

d. TWO OPENINGS OR VERTICAL DUCTS require 1
square inch (25.4 square mm)of free area per 4,000
Btuh (550 mm2/kW) for combined input of all gas
appliances in the space per Figure 6 and Table 3.
3. ONE OUTDOOR OPENING requires:
a. 1 sq. in. (25.4 square mm)of free area per 3,000 Btuh
(734 mm2/kW) for combined input of all gas
appliances in the space per Table 3 and
b. Not less than the sum of the areas of all vent
connectors 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.

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 6 illustrates how to provide TWO OUTDOOR
OPENINGS, one inlet and one outlet combustion and
ventilation air openings 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 6 and Table 3.
c. TWO HORIZONTAL DUCTS require 1 square inch
(25.4 square mm) of free area per 2,000 Btuh (1,100
mm2/kW) of combined input for all gas appliances in
the space per Figure 6 and Table 3.
Table

3

Minimum

Free Area

TWO HORIZONTAL

(BTUH)

30
40
50
60
70

60,000

80,000
100,000
120,000
140,000 *

(19355)
(25807)
(32258)
(38709)
(45161)

6 (152)
7 (178)
8 (203)
9 (229)
10 (254)

Determining
Free Area
WATER HEATER

Air Opening

(1 SQ. IN./3,000 BTUH)
(734 SQ. MM/KW)

Round
Duct
In. (mm)
Dia

Free Area of
Opening and Duct
Sq. In (Sq. mm)

for Each Combustion

SINGLE DUCT OR OPENING

(1 SQ. IN./2,000 BTUH)
(1,100 SQ. MM/KW)

FURNACE
INPUT

EXAMPLE:
FURNACE

Required
DUCTS

Round
Duct
In. (mm)
Dia

Free Area of Opening and Duct
Sq. In (Sq. mm)
20
27
34
40
47

(13043)
(17391)
(21739)
(26087)
(30435)

5
6
7
7
8

(127)
(152)
(178)
(178)
(203)

or Duct to Outdoors
TWO OPENINGS OR
VERTICAL DUCTS
(1 SQ. IN./4,000 BTUH)
(550 SQ. MM/KW)
Free Area of Opening and Duct
Sq. In (mm)

Round Duct
In. (mm)
Dia.

15 (9678)
20 (12904)
25 (16130)
30 (19355)
35 (22581)

5
5
6
6
7

(127)
(127)
(152)
(152)
(178)

TOTAL INPUT

100,000

+

30,000

=

(130,000 divided by 4,000)

=

32.5 Sq. In. for each two Vertical Ducts or Openings

60,000

+

40,000

=

(100,000 divided by 3,000)

=

33.3 Sq. In. for each Single Duct or Opening

80,000

+

30,000

=

(110,000 divided by 2,000)

=

55.0 Sq. In. for each two Horizontal Ducts

Table

4
Minimum Space Volumes for 100% Combustion,
Ventilation
and Dilution Air from Outdoors
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
40
60
80
100
120
AOH
Space Volume Ft 3 (M3)

140

0.60

1,050
(29.7)

1,400
(39.6)

1,750
(49.5)

1,400
(39.6)

1,500
(42.5)

2,000
(56.6)

2,500
(70.8)

3,000
(84.9)

3,500
(99.1)

0.50

1,260
(35.6)

1,680
(47.5)

2,100
(59.4)

1,680
(47.5)

1,800
(51.0)

2,400
(67.9)

3,000
(84.9)

3,600
(101.9)

4,200
(118.9)

0.30

1,575
(44.5)
2,100
(59.4)

2,100
(59.4)
2,800
(79.2)

2,625
(74.3)
3,500
(99.1)

2,100
(59.4)
2,800
(79.2)

2,250
(63.7)
3,000
(84.9)

3,000
(84.9)
4,000
(113.2)

3,750
(106.1 )
5,000
(141.5)

4,500
(127.3)
6,000
(169.8)

5,250
(148.6)
7,000
(198.1 )

0.20

3,150
(89.1)

4,200
(118.9)

5,250
(148.6)

4,200
(118.9)

4,500
(127.3)

6,000
(169.8)

7,500
(212.2)

9,000
(254.6)

10,500
(297.1)

0.10
0.00

6,300
(178.0)
NP

8,400
(237.8)
NP

10,500
(297.3)
NP

8,400
(237.8)
NP

9,000
(254.6)
NP

12,000
(339.5)
NP

15,000
(424.4)
NP

18,000
(509.2)
NP

21,000
(594.1)
NP

0.40

NP = Not Permitted

10

specifications
subjectto

change

without

notice.

440 01 4201

03

CONDENSATE

TRAP

Special precautions MUST be made if installing furnace in an
area which may drop below freezing. This can cause improper
operation or damage to the equipment.
If the furnace
environment has the potential of freezing, the drain trap and
drain line must be protected. Use 3 to 6 watt per foot of 115
volt, 40 ° F (4° C) self-regulating shielded and water proof heat
tape. Wrap the drain trap and drain line with the heat tape and
secure with the ties. Follow the heat tape manufacturer's
recommendations. Prime the trap before furnace operation.

FROZEN AND BURST WATER PIPE HAZARD
Failure to protect against the risk of freezing
property damage.

may result in

Special precautions MUST be made if installing furnace in an
area which may drop below freezing. This can cause improper
operation or damage to equipment. If furnace environment has
the potential of freezing, the drain trap and drain line must be
3rotected. The use of accessory drain trap heaters, electric
heat tape and/or RV antifreeze is recommended for these
installations.

Condensate

Trap - Upflow Orientation

When the furnace is installed in the upflow position, it is not
necessary to relocate the condensate trap or associated
tubing. See Figure 8 for upflow condensate trap information.
Refer to Condensate Drain section for information how to install
the condensate drain.

Condensate
Orientation

Trap - Downflow

When the furnace is installed in the downflow position, the
condensate trap wilt be initially located at the upper left corner
of the collector box, as received from the factory. See the top
image in Figure g. When the furnace is installed in the
downflow orientation, the condensate trap must be relocated
for proper condensate drainage. See bottom image in Figure 9.

PROPERY DAMAGE HAZARD
Failure to follow this caution may result in burst water pipes
and/or property damage.
If a condensate pump is installed, a plugged condensate drain
or a failed pump may cause the furnace to shut down. Do not
leave the home unattended during freezing weather without
turning off water supply and draining water pipes or otherwise
protecting against the risk of frozen pipes.

To Relocate

the Condensate

Trap:

• Orient the furnace in the downflow position.
• Figure 9 shows the condensate trap and tubing before and

DO NOT trap the drain line in any other location than at
condensate drain trap supplied with the furnace. If possible,
NOT route the drain line where it may freeze. The drain
must terminate at an inside drain to prevent freezing of
condensate and possible property damage.
Figure

8

|Upflow

the
DO
line
the

after relocation. Refer to Figure 9 to begin the trap conversion.
• Refer to Condensate Drain section for information how to install
the condensate drain.

Trap Configuration

.L

Vent Pipe Clamp
Vent Elbow Clamp

Condensate Trap
Relief Port

Elbow

Plugs

Collector Box
Plug
Sondensate Trap
Relief Port

Pressure Switch
Port

Outlet

UPFLOW TRAP CONFIGURATION
MODULATING

Representative

440 01 4201 03

UN{TS

drawing only, some models may vary in appearance.

specifications
subjectto

change

without

notice.

Al1306

11

Figure 9

Unconverted

Factory

Configuration

as viewed

in the Downflow

Orientation

Remove pressure switch tube from
pressure switch port.
Remove relief tube from relief
on condensate trap.

(_

Remove tube from
relief port.

collector
emove trap
box. from

__"

(MODULATING

UNITS)

Loosen
clamp on inlet
to
vent elbow.

Remove middle and bottom plugs.
DO NOT DISCARD.

Representative

drawing only, some models may vary in appearance.

Downflow

Trap

Configuration
Trim excess tube.
Connect pressure switch
tube to port on collector
box.

Install plugs on.
open ports on
collector box.

Attach condensate trap
with screw to collector
box.

Connect relief tube
port on collector box.

Rotate elbow to
desired position
tighten clamp to
15 lb.-in.

(MODULATING

Connect relief tube to
relief port on condensate
trap.

UNITS)

Align condensate trap
over middle and bottom
ports of collector box.

Slide tube in stand-offs
to adjust length.
Representative

12

A11585A

drawing only, some models may vary in appearance.

specifications
subjectto

change

without

notice.

A11585B

440 01 4201

03

Condensate Trap - Horizontal
Orientation
When the furnace is installed in the horizontal right position, the
condensate trap will be initially located at the bottom of the
collector box, as received from the factory. See the top image in
Figure 11. When the furnace is installed in the horizontal left
position, the condensate trap will be initially located at the top of
the collector box, as received from the factory. See the top image
in Figure 10. In both cases trap must be repositioned on the
collector box for proper condensate drainage. See bottom images
in Figure 10 and Figure 11.
A field-supplied, accessory Horizontal Installation Kit
(trap
grommet) is required for all direct-vent horizontal installations
(only). The kit contains a rubber casing grommet designed to seal
between the furnace casing and the condensate trap. (See
Figure 17)

NOTE: The condensate trap extends below the side of the
casing in the horizontal position. A minimum of 2 in. (51 mm) of
clearance is required between the casing side and the furnace
platform for the trap to extend out of the casing in the horizontal
position. Allow at least 1/4-in. (6 mm) per foot of slope away
from the furnace in horizontal sections of drain line.

To Relocate

the Condensate

Trap:

• Remove the knockout in the casing for the condensate trap.
• Install the grommet in the casing when required for direct-vent
horizontal applications.
• Orient the furnace in the desired position.
• Allow for 2 in. (51 mm) of clearance underneath the furnace for
the condensate trap and drain line.
• Figure 10 shows the condensate trap and tubing before and
after relocation in the horizontal right position.
• Figure 11 shows the condensate trap and tubing before and
after relocation in the horizontal left position.

The field-supplied, accessory horizontal drain trap grommet
is ONLY REQUIRED FOR DIRECT VENT APPLICATIONS. It
is NOT required for applications using single-pipe or ventilated combustion air venting.

• Refer to the appropriate figure to begin the trap conversion.
• Refer to Condensate Drain section for information how to install
the condensate drain.

The condensate trap extends below the side of the casing in
the horizontal position. A minimum of 2-in. (51 mm) of clearance is required between the casing side and the furnace
31atform for the trap to extend out of the casing in the horizontal position. Allow at least 1/4-in. per foot (20mm per
meter) of slope down and away from the furnace in horizontal
sections of drain line.

Figure 10

Unconverted

Factory

Configuration

as viewed

in the Horizontal

Left Orientation

Remove trap from
If alternate vent position
is required, loosen clamp
on vent elbow inlet,
collector box.

Remove relief tube
from relief port on
condensate trap.

Remove

pressure

switch tube

from port on collector

©

Remove

box.

relief tube

from port on collector
box.

Remove

middle

and right

plug from collector box.
(MODULATING UNITS)
DO NOT DISCARD
Representative drawing only, some models may vary in appearance.

440 01 4201 03

Specifications
subject
to change

without

notice.

A11586A

13

Figure 10 - continued

Horizontal Left Trap Configuration
Install plugs in open
ports on collector box.

(_

otate elbow to
desired position and
torque clamp on inlet
15 lb.-in.

(_

Slide relief to
tube
in
stand-offs
adjust
length.

(_

trap
ttachto collector
condensatebox
with screw.

Connect

relief tube to

port on collector

Trim excess

tube.

Route pressure switch tube
underneath
relief tube and
connect

©

box.

to port on collector

box.

Align trap over middle
and right-hand
collector

port on

Connect

box.
(MODULATING

relief tube to

relief port on condensate
trap.

UNITS)

A11586B

Representative drawing only, some models may vary in appearance.

Figure 11

1Unconverted

(_

Factory Configuration

as viewed in the Horizontal Right Orientation

collector
box. from
Remove plug
DO NOT DISCARD.

If alternate vent position
is required, loosen clamp
on inlet of vent elbow.

(MODULATING

Remove

trap from

collector

box.

UNITS)

Representative drawing only, some models may vary in appearance.

14

specifications
subjectto

change

without

notice.

440 01 4201

03

Figure 11 - continued

Horizontal Right Trap Configuration

Slide relief tube in
stand-offs
length.

to adjust

Vent elbow shown in alternate
(_

tottach
collector
box with trap
condensate
screw.

(_

Install plug in open
port on collector box.

orientation.
Tighten clamp on
inlet to vent elbow 15 lb.-in.

Align trap over middle and
right-hand port on collector

box.

(MODULATING UNITS)
Al1281

Representative

Condensate

drawing only, some models may vary in appearance.

Drain Connection

heat tape and secure with appropriate plastic ties. Follow the
heat tape manufacturer's
recommendations.
Prime the trap
before furnace operation.
Upflow/Downflow

FROZEN AND BURST WATER PIPE HAZARD
Failure to protect against the risk of freezing
property damage.

may result in

Special precautions MUST be made if installing furnace in an
area which may drop below freezing. This can cause improper
operation or damage to equipment. If furnace environment has
the potential of freezing, the drain trap and drain line must be
3rotected. The use of accessory drain trap heaters, electric
heat tape and/or RV antifreeze is recommended for these
installations.

In the Upflow or Downflow orientation, the condensate trap is
inside the furnace casing. The condensate drain must be
routed from the trap through the furnace casing. The
condensate drain can be routed through the left or right side of
the casing. (The left or right side is as you are viewing/facing
the furnace from the front.) The furnace condensate drain can
be connected to the indoor coil condensate drain, humidifier or
auxiliary drain traps as shown in Figure 12.
NOTE: On narrower casings, it may be easier to remove the
condensate trap, connect the drain line components and
re-install the condensate trap. Read the steps thoroughly to
familiarize yourself with the required steps.
For

Failure to follow this caution may result in burst water pipes
and/or property damage.

440 01 4201 03

Drain:

and two

3. Slide a spring clamp 1 in. (25 mm) down the plain end
(the end without the formed grommet) of the drain tube.
4. From inside the casing, insert the formed grommet end
of the elbow through the 7/8-in. knockout in the casing.
5. Pull the grommet through the casing from the outside
until it is seated in the knockout

the
DO
line
the

specifications
subjectto

Side Condensate

2. Remove the pre-formed
rubber drain tube
spring clamps from the loose parts bag.

If a condensate pump is installed, a plugged condensate drain
or a failed pump may cause the furnace to shut down. Do not
leave the home unattended during freezing weather without
turning off water supply and draining water pipes or otherwise
protecting against the risk of frozen pipes.

Special precautions MUST be made if installing furnace in an
area which may drop below freezing. This can cause improper
operation
or damage to the equipment.
If the furnace
environment has the potential of freezing, the drain trap and
drain line must be protected. A self-regulating,
shielded and
waterproof heat tape rated at 3 to 6 watt per foot (10 to 20 watt
per meter) at 115 volt, 40 ° F (4° C) may be used to help provide
freeze protection. Wrap the drain trap and drain line with the

Right

1. Remove the 7/8-in. knock-out from the right side of the
casing. (See Figure 13 for suggested knockout removal
technique.)

PROPERY DAMAGE HAZARD

DO NOT trap the drain line in any other location than at
condensate drain trap supplied with the furnace. If possible,
NOT route the drain line where it may freeze. The drain
must terminate at an inside drain to prevent freezing of
condensate and possible property damage.

Orientation

6. Attach the plain end of the drain elbow to the outlet stub
on the drain trap. Secure the drain elbow to the trap with
the spring clamp.
The remaining drain line can be constructed from field supplied
1/2-in. CPVC or 3/4-in. PVC pipe in compliance with local
building codes. A factory-supplied
1/2-in. CPVC to 3/4-in PVC
adapter is supplied in the loose parts bag for use as required.
7. Install the adapter or connect the 1/2-in. CPVC pipe by
sliding a spring clamp over the open end of the grommet
on the outside of the furnace casing.

change

without

notice.

15

8.Openthespringclampandinsertthe longendofthe
adapter
ofthe1/2-in.CPVCpipeintotheoutletstubon
thedraintube.
9.Connect additional condensatepiping to a
code-approved
drain,or to a condensate
pump
approved
for usewithacidicfurnacecondensate
and
compatible
withmineralandvegetable
oils,suchas
canola
oil.
Allowatleast1/4-in.perfoot(20mmpermeter)ofslopedown
andawayfromthefurnace
inhorizontal
sections
ofdrainline.
Figure

12

I Example

of Field Drain Attachment

1

housing has been removed to ease installation
applications, this step is not needed.)

in upflow

7. After inserting the "Z" pipe through the casing, slide a
spring clamp over each end of the "Z" pipe.
8. From inside the casing, insert the short end of the formed
grommet cut from the rubber drain tube through the
7/8-in. drain knockout in the casing.
9. Pull the grommet through the casing from the outside
until it is seated in the knockout.
10. Align the "Z" pipe with the long end of the grommet inside
the furnace and insert slightly. The angled end of the
tube at the other side of the casing should be facing the
front of the furnace.
11. Slide a spring clamp over the end of the remaining
rubber drain tube.

OPEN STAND
PIPE FOR
A/C OR
HUMIDIFIER

12. Attach the drain tube to the angled end of "Z" pipe and
the drain trap outlet stub. Adjust the length of "Z" pipe
inserted into the grommet at the opposite side of the
furnace as necessary for proper fit and positioning. In
both upflow and downflow orientations, the "Z" pipe
should NOT be resting on any sheet metal parts.

DRAIN

U
_u=---TEE

13. Secure the rubber elbow to the drain trap and the "Z"
pipe with spring clamps.
14. Secure the grommet
clamp.

The remaining drain line can be constructed from field supplied
1/2-in. CPVC or 3/4-in. PVC pipe, in compliance with local
building codes. A factory-supplied
1/2-in. CPVC to 3/4-in.
PVC adapter is supplied in the loose parts bag for use as
required.
15. Install the adapter or connect the 1/2-in. CPVC pipe by
sliding a spring clamp over the open end of the grommet
on the outside the furnace casing.

TO OPEN
DRAIN

Al1276

TIPS FROM CONTRACTORS:
Contractors have found that
temporarily
removing
the inducer assembly
in upflow
applications while performing the steps below, makes upflow
left-side drain connections easier.
For

Left Side Condensate

Drain

to the "Z" pipe with the spring

16. Open the spring clamp and insert the long end of the
adapter or the 1/2-in. CPVC pipe into the outlet stub on
the drain tube.

Connection:

17. Connect
additional
condensate
piping
to
a
code-approved
drain, or to a condensate
pump
approved for use with acidic furnace condensate and
compatible with mineral and vegetable oils, such as
canola oil.

1. For left side condensate drainage, the drain line is routed
from the condensate trap, behind the inducer (upflow) or
gas valve (downflow) and out through the left side of the
furnace casing. A pre-formed 1/2-in. CPVC "Z" pipe is
provided with the furnace. The "Z" pipe is long enough to
extend across the casing for drain connections.

Allow at least 1/4-in. per foot (20 mm per meter) of slope down
and away from the furnace in horizontal sections of drain line.

2. Locate the "Z" pipe. Remove the pre-formed drain tube
and four spring clamps from the loose parts bag.
3. The "Z" pipe is connected to the condensate trap and the
outside of the furnace by modifying the formed rubber

The field-supplied, accessory horizontal drain trap grommet
is ONLY REQUIRED FOR DIRECT VENT APPLICATIONS. It
is NOT required for applications using single-pipe or ventilated combustion air venting.

drain tube as shown in Figure 14.
4. Remove the formed grommet from the rubber drain tube
by cutting the elbow along the vertical line located about
1 3/8-in. (35 mm) away from the formed grommet. See
Figure 13.
DO
NOT
DISCARD
THE
FORMED
GROMMET OR THE RUBBER ELBOW. Both of these
pieces will be used.

TIPS FROM CONTRACTORS:
When installing the furnace
horizontally, use the entire drain elbow (that is, do NOT cut as
shown in Figure 14) to connect the trap to the drain line. This
helps to prevent bumps and shocks to the drain line from
damaging the furnace drain trap. Avoid misatignment of the
drain pipe which may cause kinks in the elbow.
Horizontal
Orientation

Assemble and route the drain line to the opposite side of the
furnace as detailed below:
5. Remove the knock-out
(See Figure 13 for
technique.)

from the left side of the casing.
suggested
knockout
removal

1. The condensate trap outlet extends 2-in. (51 mm) below
the furnace casing. Leave enough clearance between
the furnace and the furnace platform for the trap.

6. From the outside of the casing, insert the angled end of
the "Z" pipe through drain hole in the left side of the
casing and behind the inducer or gas valve. Allow the "Z"
pipe to temporarily rest on the blower shelf (upflow) or
burner box (downfiow).
(NOTE: When the inducer

16

specifications
subjectto

2. To allow for servicing the trap, the condensate drain
elbow in the loose parts bag can be used to make a
coupler to allow for future service of the condensate trap
and drain line.

change

without

notice.

440 01 4201

03

3. Remove the knock-out
side of the casing.

for the condensate

trap in the

4. Install the drain trap grommet in the casing, if required for
direct-vent applications. If necessary, remove the trap,
install the grommet and re-install the trap.
5. Remove the pre-formed
rubber drain tube and two
spring clamps from the loose parts bag.
6. Connect the full or modified elbow and/or grommet to the
outlet of the condensate trap with one spring clamp.
Avoid misalignment of the drain pipe which may cause
kinks in the elbow or grommet.

Figure

14

JModify Rubber Drain Elbow

Cut line for left side condensate drain.
Do not discard parts after cutting,
m

7. The remaining drain line can be constructed from field
supplied
1/2-in.
CPVC or 3/4-in.
PVC pipe, in
compliance with local building codes. A factory-supplied
1/2-in. CPVC to 3/4-in. PVC adapter is supplied in the
loose parts bag for use as required.
8. Install the adapter or connect the 1/2-in. CPVC pipe by
sliding a spring clamp over the open end of the elbow or
grommet on the outside the furnace casing.
9. Open the spring clamp and insert the long end of the
adapter or the 1/2-in. CPVC pipe into the outlet stub on
the drain tube.
10. Connect
additional
condensate
piping
to
a
code-approved
drain, or to a condensate
pump
approved for use with acidic furnace condensate and
compatible with mineral and vegetable oils, such as
canola oil.

1-3/8 in

Lll

Figure 15

13

|Knockout

Connection

and Routing

Attach elbow to condensate trap
Cut formed end off
condensate drain
Formed end of
grommet

Allow at least 1/4-in. per foot (20 mm per meter) of slope down
and away from the furnace in horizontal sections of drain line.
Figure

JDrain Trap

F089

elbow

Oonnect short end
of "Z" pipe to modified

Removal

drain e

.L

i

Factory supplied 1/2-in. CPVC to
3/4-in. PVC adapter
TRAP,

J

DRAIN

ELBOW

WITH

DISCHARGE

PIPE

o

Formed end of grommet
Open spring clamp. Insert
1/2-in. to 3/4-in. CPVC to
PVC adapter or 1/2-in.
CPVC pipe

Modified

drain elbow connect to

condensate

trap and "Z" pipe

,5.°¢
/"1

L12F019

CUT HAZARD
Failure to follow this caution may result in personal injury.
LEFT SIDE DRAIN ROUTED BEHIND INDUCER
NOTE: Remove Inducer Housing for easier access, if desired.

Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts, and servicing furnaces.

440 01 4201 03

specifications
subjectto

Lt2F015

change

without

notice.

17

Figure 16

Formed
INSTALL
ATTACH
DRAIN

Rubber

CLAMPS
DRAIN

ON

Drain

DRAIN

ELBOW

TO

DRAIN

STUB

Figure

Grommet

ELBOW
CONDENSATE

TRAP

18

Furnace Pitch Requirements

LEVEL 0-IN. (0 MM) TO
1/2-1N.(13 MM) MAX

/,
/

PULL

THROUGH

/

MIN 1/4-IN. (6 MM) TO
1/2-1N.(13 MM) MAX

CASING,

i
/
//

FRONT

UPFLOW OR
DOWNFLOW

HORIZONTAL

Al1237

Supply Air Connections
OPEN SPRING CLAMP
INSERT FACTORY-SUPPLIED
1/2-1N. CPVC
TO 3/4-1N. PVC ADAPTER OR 1/2-1N. CPVC PIPE
*CLAMP MAY BE LOCATED ON OUTSIDE
RIGHT

Figure

17

SIDE

1Horizontal

DRAIN

OF DRAIN ELBOW

INSTALLATION

Drain Trap

L12F022

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.
Connect supply-air
duct to flanges on furnace supply-air
outlet. Bend flange upward to 90 ° with wide duct pliers. (See
Figure 22) 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
supply-side accessories MUST be connected to duct external
to furnace main casing.

Grommet

Return Air Connections
Remove

knockout.

Install grommet before
relocating condensate
trap.
Al1348

INSTALLATION

This furnace is certified to leak 2% or less of nominal air conditioning CFM delivered when pressurized to 1-inch water
column (250 Pa) with all present air inlets (including bottom
closure in upflow and horizontal applications), air outlets, and
plumbing and electrical ports sealed.

UPFLOW

INSTALLATION

NOTE: The furnace must be pitched as shown in Figure 18 for
proper condensate drainage.

18

Specifications
subject
to change

FIRE HAZARD
A 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.
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. Bypass humidifier may be attached into unused return
air side of the furnace casing. (See Figure 27, Figure 28 and
Figure 29)

Bottom

Return

Air Inlet

These furnaces are shipped with bottom closure panel installed
in bottom return-air opening. Remove this panel when bottom
return air is used. This panel may be used as the bottom
closure of an accessory bottom return air box or discarded. To
remove bottom closure panel, perform the following:
1. Tilt or raise furnace and remove four (4) screws holding
bottom plate. (See Figure 19)
2. Remove bottom plate.
3. Remove bottom closure panel.
4. Reinstall bottom plate and screws.

without

notice.

440 01 4201 03

Figure 19

_Removing

3.

Bottom Closure Panel

LJ"

Install another nut on other side of furnace base. (Install
flat washer if desired.)
Adjust outside nut to provide desired height, and tighten
inside nut to secure arrangement.
Reinstall bottom closure panel if removed.

4.

,j, of
5.

DOWN FLOW INSTALLATION
NOTE: The furnace must be pitched as shown in Figure 18 for
proper condensate drainage.

IL
*,
"'-

Supply

_
_

_I
--

NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when any one of the following two
accessories are used (see Specification sheets for list of
approved accessories):

OM
" CLOSURE
PANEL

_

•
•

BOTTOM
PLATE

Ltl

F004

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.
(See
Figure27,
Figure 28 and Figure 29)

Special Base - NAHA01101SB
Cased Coil Assembly- EAM4X, END4X, ENW4X
Determine application being installed from Table 5.
Construct hole in floor per Table 5 and Figure 21.
Construct plenum to dimensions specified in Table 5
and Figure 21.
4. Install as shown in Figure 23. If Coil Assembly Part is
used, install as shown in Figure 24.
1.
2.
3.

Side Return Air Inlet

Leveling

Air Connections

Figure

21

Floor and
Dimensions

Plenum

Opening

Legs (If Desired)

In upflow position with side return inlet(s), leveling legs may be
used. (See Figure 20) Install field-supplied, 5/16 x 1-1/2 in. (8
x 38 mm) (max) corrosion-resistant
machine bolts, washers
and nuts.
Figure

20

_ Leveling

Legs

5/_

(Smm)

1
(44mm)
A96283

NOTE: It is recommended that the perforated supply-air duct
flanges be completely removed from furnace when installing
the furnace on a factory-supplied
cased coil. 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 22)

1 3/4"
(44mm)

(8mrn)
5/16"

(8mm)

CUT HAZARD
(44mm) 1 3/4"
(44mm)1 3/4%_
A89014

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 Step 1 in Bottom Return Air Inlet section.
To install leveling legs:
1. Position furnace on its back. Locate and drill a hole in
each bottom corner of furnace.
2. For each leg, install nut on bolt and then install bolt with
nut in hole. (Install flat washer if desired.)

440 01 4201 03

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
g oves when hand ing parts, and servicing furnaces.
Connect supply-air duct to supply-air outlet on furnace. Bend
flange inward past 90 ° with wide duct pliers (See Table 1
Figure 22) 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 factory-approved
accessory
subbase, or a factory-approved air conditioning coil casing. DO
NOT cut main furnace casing to attach supply side air duct,

Specifications
subject
to change

without

notice.

19

humidifier,
or other
MUST be connected

accessories.
All supply-side
accessories
to duct external to furnace casing.

sides
made

(left or right). Bypass humidifier
at ductwork
or coil casing sides

Figure

Return Air Connections

27)

Bottom
These

FIRE

death

to follow

and/or

Return

furnaces

Air Inlet

are shipped

with bottom

closure

panel

installed

in bottom
return-air
opening.
Remove
and discard this panel
when bottom return air is used in downflow
applications.
To
remove bottom closure panel, perform the following:

HAZARD

A failure

connections
should be
exterior to furnace.
(See

this

property

warning

could

cause

personal

injury,

Never connect
return-air
Fo ow instructions
be ow.

ducts

to the

back

of the

furnace.

The return-air
duct must be connected
to return-air
opening
bottom
inlet) as shown in Figure 27. DO NOT cut into casing

Figure 22

1.

Tilt or raise furnace and remove four (4) screws
bottom plate panel. (See Figure 19)

2.

Remove

bottom

plate.

3.

Remove

bottom

closure

4.

Reinstall

bottom

plate and screws.

damage.

holding

panel.

1Duct Flanges

UPFLOW

DOWNFLOW

HORIZONTAL

)RATED
DUCT
FLANGE
I ......

YES

YES

YES

r- .....
120°_

YES

[2--2--

120_

MIN

YES

12

YES

MIN

MIN

NO

-_,_

Ll

NO

NO

A10493

Table 5

Opening Dimensions - in. (mm)

FURNACE
CASI NG WIDTH
IN. (mm)

PLENUM OPENING
A
Upflow Applications on Combustible or Noncombustible
(subbase not required)

17-1/2

22-1/4
(565)

15-7/8
(403)

19
(483)

16-1/2
(419)

19-5/8
(498)

15-1/8
(384)

19
(483)

16-3/4
(425)

20-5/8
(600)

15-1/2
(394)

19
(483)

16-1/2
(419)

20
(508)

19-1/2
(495)

21-5/8
(549)

20-1/8
(511)

22-1/4
(565)

19-3/8
(492)

19
(483)

20
(508)

19-5/8
(498)

18-5/8
(473)

19
(483)

20-1/4
(514)

20-5/8
(600)

19
(483)

19
(483)

20
(508)

20
(508)

23
(584)

21-1/8
(537)

23-5/8
(600)

22-1/4
(565)

22-7/8
(581)

19
(483)

23-1/2
(597)

19-5/8
(498)

Downflow applications on Combustible flooring
(subbase required)

22-1/8
(562)

19
(483)

23-3/4
(603)

20-5/8
(600)

Downflow Applications on Combustible Flooring with Coil Assembly or
coil box (subbase not required)

22-1/2
(572)

19
(483)

23-1/2
(597)

20
(508)

Flooring

on Combustible Flooring with Coil Assembly or coil
box (subbase not required)

Upflow Applications on Combustible or Noncombustible
(subbase not required)
Downflow Applications on Noncombustible
(subbase not required)

Flooring

on Combustible Flooring with Coil Assembly or coil
box (subbase not required)

Upflow Applications on Combustible or Noncombustible
(subbase not required)

20

Flooring

Downflow applications on combustible flooring
(subbase required)
Downflow Applications

(622)

D

16-5/8
(422)

Downflow Applications

24-1/2

C

21-5/8
(549)

Downflow applications on combustible flooring (subbase required)

(533)

B

16
(406)

Downflow Applications on Noncombustible
(subbase not required)

Flooring

(445)

21

FLOOR OPENING

APPLICATION

Downflow Applications on Noncombustible
(subbase not required)

Specifications

subject

Flooring

Flooring

to change

without

notice.

440 01 4201

03

Figure 23

I Installed
Furnace,

Furnace,
Assembly

Figure 24

on
a Combustible
Floor
Plenum,
and Subbase

Plenum, and Coil
on a Combustible
FURNACE

FURNACE
(OR COIL CASING
WHEN USED)

END4X, ENW4X
COIL ASSEMBLY

COMBUSTIBLE
FLOORING
COMBUSTIBLE
FLOORING

--_

--\

SHEET METAL
PLENUM
"--".

SUBBASE
SHEET METAL
PLENUM
--

Floor

FLOOR
OPENING

FLOOR
OPENING

Ltl

F104

A96285

HORIZONTAL

INSTALLATION

NOTE: The furnace must be pitched forward
Figure 18 for proper condensate drainage.

as shown

in

FIRE, EXPLOSION, AND CARBON MONOXIDE POISONING
HAZARD
Failure to follow this warning could result in personal
death, or property damage.

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.

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

Failure to follow this caution may result in minor
damage.

property

Local codes may require a drain pan under entire furnace and
condensate trap when a condensing furnace is used in an attic
application or over a finished ceiling.

Furnace

Support

The furnace may be supported under the entire length of the
furnace with threaded rod and angle iron. (See Figure 25)
Secure angle iron to bottom of furnace as shown.

Platform

MINOR PROPERTY HAZARD

injury,

Furnace

Support

Construct working platform at location where all required
furnace clearances are met. (See Table 1 and Figure 26) 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.

The furnace can be installed horizontally
in an attic or
crawlspace 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.

440 01 4201 03

Specifications

subject

to change

without

notice.

21

Figure 25

I Suspended

Furnace Installation
--

COMBUSTION g AiR PIPE
(SEE VENTING SECTION)

7ENT
ROD

DRAIN

ND

ANGLE

iRON

OUT

COIL

SUPPORT

FOR
HEX

REQD.

NOTES: 1. A 1 In. (25mm) clearance minimum between
top of furnace and combustible material

NUT

& WASHER

(4)

PER

ROD

2. The entire length of furnace must be
suppoded when furnace is used in hodzontam
position to ensure proper drainage.

ROD LOCATION l
USING DIMPLE /
LOCATORS

3. Furnace shown is a direct vent application.
Refer to the Venting section for allowable vent
configurations.

NOTE:

Local codes may require a drain pan and condensate
ceiling

Figure 26

A11155

trap when a condensing

furnace

is installed over a finished

I Working Platform for Attic Installation
COMBUSTION
(SEE VENTING

SECTION

- AIR PIPE
SECTION)

VENT

(305 ram) MIN HORIZONTAL
PIPE
IS RECOMMENDED
WITH A

SHORT (5 TO 8 FT / 1,5 TO 2,4 M) VENT
SYSTEM TO REDUCE EXCESSIVE
CONDENSATE
DROPLETS FROM
EXITING THE VENT PIPE,

30" (762 mrn)
Min Work Area

MANUAL
SHUTOFF
GAS VALVE

SEDI[
TRAP

CONDENSATE
TRAP

NOTE: FURNACE
VENTING

NOTE:

22

Local codes may require
ceiling

ROLLOUT PROTECTION REQUIRED Install 1.2" x 22" (305 x 559
mm) sheet metal in front of burner
compartment area.

INDOOR
COIL

SHOWN AS DIRECT
SECTION

a drain pan and condensate

Specifications

subject

VENT APPLICATION.

FOR ALLOWABLE

REFER

trap when a condensing

to change

without

TO THE

VENT CONFIGURATIONS

notice.

A11154

furnace

is installed

over a finished

440 01 4201 03

Roll-Out

Protection

Provide a minimum 12-in. x 22-in. (305 x 559 mm) piece of
sheet metal for flame roll-out protection in front of burner area
for furnaces
closer than 12-in.
(305 mm) above the
combustible deck or suspended furnaces closer than 12-in.
(305mm) to joists. The sheet metal MUST extend underneath
the furnace casing by 1-in. (25mm) with the door removed.
The bottom closure panel may be used for flame roll-out
protection when bottom of furnace is used for return air
connection. See Figure 26 for proper orientation of roll-out
shield.

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.
Connect supply-air
duct to flanges on furnace supply-air
outlet. Bend flange upward to 90 ° with wide duct pliers. (See
Figure 22) 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
supply-side accessories MUST be connected to duct external
to furnace main casing.
The return-air duct may be connected to bottom of the furnace.
The side of casing that faces downward may also be used for
return air connection.
A combination of the bottom and
downward facing side may also be used. The upward facing
side of the casing cannot be used as a return air connection.
(See Figure 29)

Return

Air Inlet

These furnaces are shipped with bottom closure panel installed
in bottom return-air opening. Remove this panel when bottom
return air is used. This panel may be used for rollout protection
or discarded. To remove bottom closure panel, perform the
following:
1. Tilt or raise furnace and remove four (4) screws holding
bottom plate. (See Figure 19)
2. Remove bottom plate.
3. Remove bottom closure panel.
4. Reinstall bottom plate and screws.

Side Return

Table

6

Filter

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.
Not all horizontal furnaces are approved for side return air
connections (See Figure 29)

Size

Information
FILTER SIZE

- inch

(mm)

FURNACE
CASING
WIDTH

SIDE RETURN

BOTTOM
RETURN

17-1/2
(445)

16 x 25 x 3/4
(406 x 635 x 19)

16 x 25 x 3/4
(406 x 635 x 19)

Washable*

21 (533)

16 x 25 x 3/4
(406 x 635 x 19)

20 x 25 x 3/4
(508 x 635 x 19)

Washable*

24-1/2
(622)

16 x 25 x 3/4
(406 x 635 x 19)

24 x 25 x 3/4
(610 x 635 x 19)

Washable*

Recommended
number.

Return Air Connections

Bottom

For upflow applications, the filter can be installed on either side
of the furnace, the bottom of the furnace or any combination of
side and bottom of the furnace. (See Figure 28, Figure 30, and
Figure 31)
For downftow applications, the filter rack (or field supplied
accessory air cleaner) must only be connected to the bottom
opening on the furnace (See Figure 27 and Figure 31 and
Table 9).
For horizontal applications, the filter rack (or field supplied
accessory air cleaner) can be connected to the bottom opening
on the furnace. For side return use in the horizontal position,
refer to Figure 29. If both side and bottom openings are used in
Figure 29, each opening used will require a filter.
A filter rack or any field supplied accessory air cleaner can also
be installed in the common return duct prior to entering the
return air opening in any orientation.
See Table 6 for recommended filter size details.

to maintain air filter face velocity.

See Product

FILTER
TYPE

Data for part

Refer to the instructions supplied with the Filter Rack or
accessory air filter for additional assembly and installation
options.

Filter and Return Duct Sizing
Pressure drop must be taken into account when sizing filters,
filter racks, IAQ devices, and associated system ductwork. See
Table7
for a comparison
of Pressure Drop (initial/clean
resistance to airflow) versus Airflow for a variety of filter media
types and sizes. These are representative numbers. Consult
the filter or IAQ device manufacturers' specification sheet for
performance data for a particular filter media or IAQ device.
Design the filter and associated ductwork for the best match of
pressure drop versus filter size. Best practice usually chooses filter
systems with pressure drops under 0.2 in. w.c. (50 Pa), with the
best blower electrical efficiency and system airflow performance
occurring with filter pressure drops under 0.1 in. w.c. (25 Pa).
Due to the relatively high pressure drops of 1-in (25 mm) thick
after-market filter media, it is recommended that the filtration
system be designed for at least 2-in (51 mm) thick media.
TIPS FROM CONTRACTORS:
Install a media cabinet capable
of incorporating a 4-in (102 mm) thick media filter. This allows
room for future upgrades to other IAQ devices.

Filter Arrangement

FIRE, CARBON MONOXIDE AND POISONING

HAZARD

Failure to follow this warning could result in personal injury, or
death.
Never operate a furnace without a filter or filtration device
installed. Never operate a furnace with filter or filtration device
access doors removed.

Furnaces

shipped

without

a filter

rack:

There are no provisions for an internal filter in these furnaces.
An external filter rack is required and is purchased separately.
A field supplied accessory air cleaner may also be used in
place of the filter rack.
440 01 4201 03

Specifications

subject

Design the duct system FIRST to determine how much pressure drop may be allowed in the filter system. See the AIR
DUCTS section. Excessive filter pressure drop often compromises system airflow and duct performance, causes inadequate airflow to the furthest ends of the duct system, as well
as causes excess noise and higher than anticipated electrical
consumption.
Provide duct transitions, as required, to smoothly transition airflow
from the return duct system to the filter (or IAQ device) to the
furnace when the dimensions of the ductwork or furnace return air
opening do not match the required filter or IAQ device dimensions.
See the instructions supplied with factory-accessory
duct
adapters.

to change

without

notice.

23

Table 7

Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c. (Pa)
Representative

After-Market

OFM

L/s

600

(283)

Factory-Accy
Washable
(1-in./2.5 cm)
0.04
(12)

800

(378)

0.06

(15)

O.10

(25)

O.15

(39)

1000

(472)

0.07

(18)

0.13

(34)

0.21

(52)

1200

(566)

0.08

(20)

O.17

(43)

0.27

(68)

14 x 25 Filter

L/s

600

(2-in./5

cm)

cm)

(1-in./2.5

cm)

(17)

0.10

(26)

0.24

(60)

O.16

0.34

(85)

0.23
0.32

Representative

After-Market

(1-in. /2.5

cm)

(283)

0.04

(1 O)

0.06

(15)

0.09

(2-in. /5

cm)

(1-in. /2.5

cm)

(22)

0.20

(51)

0.29

(72)

800

(378)

0.05

(13)

0.08

(21)

O.13

(32)

1000

(472)

0.06

(16)

0.11

(28)

0.17

(43)

1200

(566)

0.07

(18)

O.14

(36)

0.22

(56)

1400

(661)

0.08

(21)

O.18

(45)

0.28

(70)

1600

(755)

0.09

(23)

0.21

(54)

1800

(850)

O.10

(25)

0.26

(64)

Representative

(1-in./2.5

cm)

(1-in./2.5

cm)

800

(378)

0.04

(11 )

0.06

(16)

0.09

1000

(472)

0.05

(13)

0.08

(21)

1200

(566)

0.06

(15)

0.11

1400

(661)

0.07

(17)

1600

(755)

0.08

1800

(850)

2000

(944)

2200

(1038)

800

Filter Media*

(1-in./2.5

cm)

(24)

0.22

(55)

(2-in. /5
0.15

0.13

(32)

0.29

(72)

0.20

(49)

(27)

0.16

(41)

0.25

(63)

0.13

(33)

0.20

(51)

0.31

(79)

(19)

O.16

(40)

0.24

(61)

0.08

(21)

O.18

(47)

0.29

(73)

0.09

(23)

0.21

(54)

0.09

(24)

0.25

(62)

(2-in./5

cm)

Representative

Factory-Accy
Washable
L/s

(2-in. /5 cm)
0.13
(34)
0.20
(49)
0.27
(67)

Pleated*

(L/s)

CFM

After-Market

Fiberglass*

CFM

25 x 25 Filter

(81)

Pleated*

cm)

Factory-Accy
Washable

(40)
(59)

Filter Media*

Fiberglass*

(1-in./2.5

20 x 25 Filter

(2-in. / 5 cm)

(1-in./2.5

Washable

CFM

Pleated*

0.07

Factory-Accy
16x 25 Filter

Filter Media*

Fiberglass*

After-Market

cm)
(37)

Filter Media*

Fiberglass*

Pleated*

(1-in./2.5

cm)

(1-in./2.5

cm)

(2-in./5

(378)

0.03

(9)

0.05

(12)

0.07

1000

(472)

0.04

(11 )

0.06

(16)

1200

(566)

0.05

(13)

0.08

1400

(661)

0.06

(15)

1600

(755)

0.06

1800

(850)

2000
2200

cm)

(1-in./2.5

cm)

(18)

O.17

(43)

(2-in. /5
0.11

cm)

0.09

(24)

0.22

(55)

0.15

(37)

(20)

0.12

(31)

0.27

(68)

0.18

(47)

0.10

(24)

0.15

(38)

0.23

(58)

(16)

O.11

(29)

O.18

(45)

0.28

(69)

0.07

(18)

O.13

(34)

0.21

(53)

(944)

0.08

(19)

0.16

(39)

0.24

(61)

(1038)

0.08

(21)

O.18

(45)

0.28

(70)

(28)

* Representative estimates from filter manufacturer data sheets.
See manufacturers' specifications for pressure drop versus airflow data for specific filter media.
If the filter size that you are looking for is not contained in Table 7, refer to Table 8 for a comparison of Pressure Drop (initial/clean
resistance to airflow) versus Face Velocity for a variety of filter media types.
The following equations relate Face Velocity (FPM), Filter Area and Airflow (CFM):
Filter Face Velocity = Airflow / Filter Area
Minimum Filter Area = Rated System Airflow / Maximum Filter Face Velocity

Table 8
Filter Media Pressure Drop (Clean) Versus Velocity - in. w.c. (Pa)
Face Velocity
Factory-Accy
Representative After-Market Filter Media*
Washable
FPM
200
300

(m/s)
(I)
(1.5)

400
500
600

(2)
(2.5)
(3)

700

(3.6)

(1-in. / 2.5 cm)
0.04
(10)
0.05
(14)
0.07
(17)
0.08
(21)
0.09
(23)
0.10
(26)

Fiberglass*
(1-in. / 2.5 cm)
0.05
(13)
0.09
(22)
0.13
(32)
0.18
(44)
0.23
0.29

Pleated*
(2-in. / 5 cm)
0.08
(20)
0.13
(34)
0.20
(50)
0.27
(69)

(1-in. / 2.5 cm)
0.18
(47)
0.30
(75)

(2-in. / 5 cm)
0.12
(31)
0.21
(52)
0.31
(78)

* Representative estimates from filter manufacturer data sheets.
See manufacturers' specifications for pressure drop versus airflow data for specific filter media.
24

Specifications

subject

to change

without

notice.

440 01 4201

03

External

Figure 27

J Configurations
Downflow Return
and
AirRestrictions
(17 RETURN
AIR
.......................
_////i .........................

Filter Cabinet

Figure 30

Configurations

] Accessory Side Filter Rack

/

SIDE RETURN
NOT PERMI]qED
FOR ANY MODEL

O

®
®
SIDE RETURN
NOT PERMITTED
FOR ANY MODEL

i s_LY

L,OFO33

Upflow Return Air Configurations
and Restrictions

Figure 28

SUPPLY

_"

.............
_iR//L ....................
L10F027

_1..=_

1

I.,=_(3 cm)

-'1 |
®

®

®

®

i........................
r_

®
RETURN
AIR

t

r_

I

II=

17 _'!
(43.5 cm)
I

C!)

RETURN
UPFLOW AIR
RESTRICTIONS

cm)(1.3

TABS

!

/

(6_m)

i ' !
,,q

I

(3

16 }

23 _" _
(59 cm)

L10F032

IL
Figure 29

23A,,

½"

cm)

RETURN
AIR

AIR
RETURN

//(1

tTYP/
//

_"

OPENING

I Configurations
Horizontal ReturnandAirRestrictions
L12F023

HORIZONTAL
RETURN

)

TOP

NOT

PERMITTED
ANY MODEL

FOR

SUPPLY
AIR

24
RETURN

0

AIR

* NOTE: RESTRICTION SAME FOR
HORIZONAL LEFT

SIDE RETURN

RETURN
AIR

AIR NOT PERMITTED

FLOW

440 01 4201 03

HORIZONAL
RETURN
AIR
RESTRICTIONS

FOR 2000 CFM AND ABOVE OF AIR
L10F034

Specifications

subject

to change

without

notice.

25

Figure

31

Accessory

Bottom

Air Ducts

Filter Rack

I

om

0

®

@

@

@

Many states, provinces and localities are considering or have
implemented standards and/or restrictions on duct sizing
practices, ductwork leakage, and/or ductwork thermal, airflow
and electrical efficiencies. CONSULT LOCAL CODE OFFICIALS for ductwork design and performance requirements in
your area.

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 Manual D), 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 the
Service and Technical Manual, 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.

L10F031

B
A
o

e

.3

Ductwork passing through unconditioned
space should
insulated
to enhance
system
performance.
When
conditioning is used, a vapor barrier is recommended.

A
22-5/t

I

6

(566.4)

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.

28-7/16
(722.2)

Return
,3
o

o

o

o

o

o

o

Ductwork

o

2-3/t 6 - ,,=_=.
(55.5)
Table

9

KIT NO.

Dimensional
FURNACE
WIDTH

Drawing

- inch (mm)

A

B

NAHB00601 FF

17-1/2
(444.5)

14-5/8
(371.5)

17-5/8
(447.7)

NAHB00701FF

21
(533.4)

18-1/8
(460.4)

21-1/8
(536.6)

NAH B00801FF

24-1/2
(622.3)

21-5/8
(549.3)

24-5/8
(625.5)

26

Duct Sizing

Refer to the Filter Selection and Duct Sizing section for
information on the proper selection of filter sizes and the
associated ductwork and duct transitions. Improperly designed
filtering systems and return ductwork are the most common
causes of airflow and/or noise complaints in HVAC systems.

o

o

be
air

Specifications

subject

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.
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.

to change

without

notice.

440 01 4201 03

GAS PIPING
FIRE OR EXPLOSION HAZARD
FIRE OR EXPLOSION

A failure to follow this warning could result in personal injury,
death, and/or property damage.

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. A fire or explosion may result
causing property damage, personal injury or loss of life.

If local codes allow the use of a flexible gas appliance connector, always use a new listed connector. Do not use a connector
which has previously served another gas appliance. Black iron
pipe shall be installed at the furnace gas control valve and extend a minimum of 2-in. (51 mm) outside the furnace.

FURNACE DAMAGE HAZARD
Failure to follow this caution may result in furnace damage.
FIRE OR EXPLOSION

Connect gas pipe to furnace using a backup wrench to avoid
damaging gas controls and burner misalignment.

HAZARD

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

Table

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

FIRE OR EXPLOSION

10

Maximum Capacity of Pipe

NOMINAL
IRONPIPE
SIZE
IN.(aM)

INTERNAL
DIA.
IN.(aM)

1/2 (13)

0,622
(158)

HAZARD

LENGTH OF PIPE - FT (M)
10
(3.0)

20
(6.0)

30
(9.1)

40
(12.1)

50
(15.2)

175

120

97

82

73

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

3/4 (19)

0,824 (20,9)

360

250

200

170

151

1 (25)

1,049 (26,6)

680

465

375

320

285

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.

1-1/4(32)

1.380(35.0)

1400

950

770

660

580

1-1/2(39)

1.610(40.9)

2100

1460

1180

990

900

Gas piping must be installed in accordance with national and
local codes. Refer to current edition of NFGC in the U.S.A.
Refer to current edition of CAN/CSA B149.1 in Canada.
Installations must be made in accordance with all authorities
having jurisdiction. If possible, the gas supply line should be a
separate line running directly from meter to furnace.
NOTE: Use a back-up wrench on the inlet of the gas valve
when connecting the gas line to the gas valve.

* Cubic ft of gas per hrfor gas pressures
of 0.5 psig (14-in.
W.C.) or less and
a pressure
drop of 0.5-in.
W.C. (based on a 0.60 specific gravity gas). Ref: Table
above, and 6.2 of NFPA54/ANSI
Z223.1-2009.

10

An accessible manual equipment shutoff valve MUST be
installed external to furnace casing and within 6 ft. (1.8 M) of
furnace.
Install a sediment trap in riser leading to furnace as shown in
Figure 32. Connect a capped nipple into lower end of tee.
Capped nipple should extend below level of furnace gas
controls. Place a ground joint union between furnace gas
control valve and exterior manual equipment gas shutoff valve.
Figure

32

I Typical

Gas Pipe Arrangement

IN THE STATE OF MASSACHUSETTS:
1.
2.
3.
4.

Gas supply connections MUST be performed by a licensed plumber or gas fitter.
When flexible connectors are used, the maximum
length shall not exceed 36-in. (915 mm).
When lever handle type manual equipment shutoff
valves are used, they shall be T-handle valves.
The use of copper tubing for gas piping is NOT approved by the state of Massachusetts.

MANUAL

_U_

SHUT OFF
VALVE

_

/

"_

(REQUIRED_
SEDIMEN/_T

UNION

TRAP

Refer to Table 10 for recommended gas pipe sizing. Risers
must be used to connect to furnace and to meter. Support all
gas piping with appropriate
straps, hangers, etc. Use a
minimum of one hanger every 6 ft. (1.8 M). Joint compound
(pipe dope) should be applied sparingly and only to male
threads of joints. Pipe dope must be resistant to the action of
propane gas.

"_'v

NOTE: " Union maybe inside the
vestibule where permitted by
local codes".

LIOF030

A 1/8-in. (3 mm) NPT plugged tapping, accessible for test
gauge connection, MUST be installed immediately upstream of
gas supply connection to furnace and downstream of manual
equipment shutoff valve.

440 01 4201 03

Specifications

subject

to change

without

notice.

27

Pipingshouldbepressure
andleaktestedinaccordance
with
thecurrent
addition
oftheNFGOintheUnitedStates,local,
andnational
plumbing
andgascodesbeforethefurnacehas
beenconnected.
Referto currenteditionof NSONGPIO
in
Canada.
Afterall connections
havebeenmade,purgelines
andcheck
forleakage
atfurnace
priortooperating
furnace.
NOTE:The furnacegas controlvalveinletpressuretap
connection
is suitableto use as test gaugeconnection
providing
testpressure
DOES
NOTexceed
maximum
0.5psig
(14-in.w.c.)statedongascontrol
valve.(SeeFigure33)
Redundant
Figure

33

Valve

Automatic

Figure

34

]Gas

Entry

Left Side Gas Entry. Gas Pipe
GrommetRequired For Direct
Vent Applications.

Gas Pipe Grommet Requirec
For DirectVent Applications

Control

(Modulating)
MODULATING

eN/OFF Switch

All

ELECTRICAL

ELECTRICAL

338

CONNECTIONS

SHOCK HAZARD

Failure to follow this warning could result in personal injury or
death.
Blower door switch opens 115-v power to control. No
component operation can occur. Do not bypass or close switch
with blower door removed.
See Figure 35 for field wiring diagram showing typical field
115-v wiring. Check all factory and field electrical connections
for tightness.
Field-supplied
(33°0) rise.

wiring shall conform with the limitations of 63°F

Pressure Tap
A10496

If pressure exceeds 0.5 psig (14-in. w.c.), gas supply pipe must
be disconnected from furnace and capped before and during
supply pipe pressure test. If test pressure is equal to or less
than 0.5 psig (14-in. w.c.), turn off electric shutoff switch
located on furnace gas control valve and accessible manual
equipment shutoff valve before and during supply pipe
pressure test. After all connections have been made, purge
lines and check for leakage at furnace prior to operating
furnace.
The gas supply pressure shall be within the maximum and
minimum inlet supply pressures marked on the rating plate with
the furnace burners ON and OFF.
Some installations require gas entry on right side of furnace (as
viewed in upflow). (See Figure 34)

ELECTRICAL

SHOCK AND FIRE HAZARD

Failure to follow this warning could result in personal injury,
death, or property damage.
The cabinet MUST have an uninterrupted or unbroken ground
according to NEO ANSl/NFPA 70-2011 or local codes to
minimize personal injury if an electrical fault should occur. In
Canada, refer to Canadian Electrical Code OSA O22.1. This
may consist of electrical wire, conduit approved for electrical
ground or a listed, grounded power cord (where permitted by
local code) when installed in accordance with existing electrical
codes. Refer to the power cord manufacturer's
ratings for
proper wire gauge.
Do not use gas piping as an electrical ground.

Gas Pipe Grommet
For direct vent (2-pipe) applications, the knockout for the gas
pipe must be sealed to prevent air leakage. Remove the
knockout, install the grommet in the knockout, then insert the
gas pipe. The grommet is included in the loose parts bag. (See
Figure 34)

FURNACE MAY NOT OPERATE HAZARD
Failure to follow this caution may result in intermittent furnace
operation.
Furnace control must be grounded for proper operation or
else control will lock out. Control must remain grounded
through green/yellow wire routed to gas valve and manifold
bracket screw.

115-V

Wiring

Furnace must have a 115-v power supply properly connected
and grounded.
NOTE: Proper polarity must be maintained for 115-v wiring.
Control status indicator light flashes code 10 and furnace does
28

Specifications

subject

to change

without

notice.

440 01 4201

03

not operate
grounded.

if polarity

is incorrect

or if the furnace

is not

Use a separate, fused branch electrical circuit with a properly
sized fuse or circuit breaker for this furnace. See Table 11 for
wire size and fuse specifications. A readily accessible means of
electrical disconnect must be located within sight of the
furnace.

Verify that the voltage, frequency, and phase correspond to that
specified on unit rating plate. Also, check to be sure that
service provided by utility is sufficient to handle load imposed
by this equipment. Refer to rating plate or Table11
for
equipment electrical specifications.
U,S,A, Installations:
Make all electrical
connections
in
accordance with National Electrical Code (NEC) ANSI/NFPA 70
and any local codes or ordinances that might apply.
Canadian Installations:
Make all electrical connections
in
accordance with the current edition of the Canadian Electrical
Code CSA C22.1 and any local codes or ordinances that might
apply.

J-Box

Installation

FIRE OR ELECTRICAL

SHOCK HAZARD

Failure to follow this warning could result in personal
death, or property damage.

injury,

If field-supplied manual disconnect switch is to be mounted on
furnace casing side, select a location where a drill or fastener
cannot damage electrical or gas components.
The J-Box is used when field line voltage electrical connections
are made to the furnace wiring harness inside the furnace
casing. The J-Box is not required if a field-supplied electrical
box is attached to the outside of the furnace casing and the box
is grounded to the green ground wire of the main wiring
harness and the earth ground of the field electrical supply.

FIRE HAZARD
Failure to follow this warning could result in personal injury,
death, or property damage.
Do not connect aluminum wire between disconnect switch
and furnace. Use only copper wire.

The J-Box cover, mounting bracket and screws are shipped in
the loose parts bag included with the furnace. The J-Box can
be mounted on the left or right side of the casing, as viewed
from the upfiow position. (See Figure 36)

SWITCH

Al1146

Figure 35

I Heating and Cooling Application Wiring

Diagram with Single-Stage
....
....
--

NOTE 2

FIVE_
WIRE
THREEWiRE

BLOWER

DOOR

SWITCH

_

(_ (_) (_)
I

I
I

I
I

I
I

I
I

1-STAGE
THERMOSTAT
TERMINALS

I

ONLY

c@
TN@
115-VOLTFIELD- JUNCTION
SUPPLIED
BOX
FUSED
DISCONNECT

I

I

I

I

I

I
L__I

I

I
I
I

I
I
I

I
I
I

I
I

I
I

I
I

I

I

I

rl
I
I
--

"_ .....

R @
O

NOTE1

24-VOLT
TERMINAL
BLOCK
FURNACE

I

I

Thermostat

FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-VOLT WIRING

FIELD-SUPPLIED
FUSEDDISCONNECT
208/230- OR
_60-VOLT

iiiii/iiii!iiiiiiiii

PHASE

|
|
i

I

I

H

==_===1208/230-

D-4_ == .J_FT-Tt,=,_== = _VOLT
I"_
- -I
f'SINGLE

_-J-1
II II I
I_
J I L._____
I
CONDENSING
UNiT

NOTES: 1. Connect Y/Y2-terminal as shown for proper operation.
2. Some thermostats require a "C" terminal connection as shown.
3. If any of the original wire, as supplied, must be replaced, use
same type or equivalent wire,

Al1401

440 01 4201 03

Specifications

subject

to change

without

notice.

29

Figure 36

5.

Optional J-Box Locations

6.

7.
8.

OPTIONAL
J-BOX

__CATIONS

9.

Route external field power wires through holes in
electrical box and casing.
Connect field ground wire and factory ground wire to
green ground screw on J-Box mounting bracket as
shown in Figure 37.
Connect field power and neutral leads to furnace power
leads, as shown in Figure 35.
Attach furnace J-Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires
between cover and bracket.
Complete external disconnect wiring and installation.
Connect line voltage leads as shown in Figure 38. Use
best practices (NEC) ANSl/NFPA 70 in U.S. for wire
bushings, strain relief, etc., and Canadian Electrical
Code CSA O22.1.

Figure 38

/

Representative

/

J
GROUNU

drawing only, some models may vary in appearance.
L12F024
NEUTRAb

Remove the J-Box cover and mounting bracket from the loose
parts bag. Select a 7/8-in. (22 mm) knock-out on the desired
side of the casing. Remove the knock-out from the casing. Drill
two 1/8-in. (3 mm) pilot holes in the casing dimples by the
desired 7/8-in. (22 mm) knock-out.
Align the J-Box mounting bracket against the inside of the
casing and secure the mounting bracket with the screws. (See
Figure 37)

Electrical

Box on Furnace

Casing

Side

NOTE: Check that duct on side of furnace will not interfere with
installed electrical box.
1. Fasten a field-supplied external electrical box to the
outside of the casing by driving two field-supplied
screws from inside electrical box into casing. (See
Figure 38)
2. Route field power wiring into external electrical box.
3. Pull furnace power wires through 1/2-in. (12 mm)
diameter hole in J-Box. If necessary, loosen power
wires from strain-relief
wire-tie on furnace wiring
harness.
4. Connect any code required external disconnect(s) to
field power wiring.
Figure

37

J-Box

Bracket

A10141

Power Cord Installation

in Furnace

J-Box

NOTE: Power cords must be able to handle the electrical
requirements
listed in Table 11. Refer to power cord
manufacturer's listings.
1. Install J-Box mounting
casing. (See Figure 37)

bracket

to

inside

2. Route listed power cord through 7/8-in.
diameter hole in casing and J-Box bracket.

Installation

J-BOX
MOUNTING
SCREWS

of furnace
(22

mm)

3. Secure power cord to J-Box bracket with a strain relief
bushing or a connector approved for the type of cord
used.

\..

J-BOX
__.
MOUNTING
\\
BRACKET

Casing Electrical Box on
I Furnace
Field-Supplied

4. Pull furnace power wires through 1/2-in. (12 mm)
diameter hole in J-Box. If necessary, loosen power wires
from strain--relief wire-tie on furnace wiring harness.

\

5. Connect field ground
green ground screw
shown in Figure 37.

"\\

wire and factory ground wire to
on J-Box mounting bracket as

6. Connect power cord power and neutral leads to furnace
power leads as shown in Figure 35.
7. Attach furnace J-Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires
between cover and bracket.

BX Cable Installation
1. Install J-Box
casing.

mounting

in Furnace
bracket

to

J-Box
inside

of furnace

L12F025

30

Specifications

subject

to change

without

notice.

440 01 4201

03

2. Route BX connector through 7/8-in. (22 mm) diameter
hole in casing and J-Box bracket.
3. Secure BX cable to J-Box bracket with connectors
approved for the type of cable used.
4. Connect field ground wire and factory ground wire to
green ground screw on J-Box mounting bracket as
shown in Figure 37.
5. Connect field power and neutral leads to furnace power
leads, as shown in Figure 35.

2.

Connect an accessory 24 VAC, 0.5 amp. Maximum (if
used) to the 1/4-in mate quick-connect HUM terminal
and COM-24V screw terminal on the control board
thermostat strip.

6. Attach furnace J-Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires
between cover and bracket.

24-V

NOTE: If the humidifier has its own 24 VAC power supply, an
isolation relay may be required. Connect the 24 VAC coil of the
isolation relay to the HUM and COM/24V screw terminal on the
control board thermostat strip. (See Figure 40)
3. Communication Connector
This connection
is used when the furnace
is
controlled by an optional communicating wall control
instead of a standard thermostat. The communication
plug is supplied with the communicating wall control.
Refer
to the
instructions
supplied
with
the
communicating wall control for complete details.
4. Outside Air Thermistor (OAT)
The OAT connection is used in conjunction with
communicating wall control. It is not required when the
furnace is controlled by a standard type thermostat.
Refer
to the
instructions
supplied
with
the
communicating wall control for complete details.

Wiring

Make field 24-v connections at the 24-v terminal strip. (See
Figure 40) Connect terminal Y/Y2 as shown in Figure 35 for
proper cooling operation. Use only AWG No. 18, color-coded,
copper thermostat wire.
NOTE: Use AWG No. 18 color-coded copper thermostat wire
for lengths up to 100 ft. (30.5 M). For wire lengths over 100 ft.,
use AWG No. 16 wire.
The 24-v circuit contains an automotive-type,
3-amp. fuse
located on the control. Any direct shorts during installation,
service, or maintenance could cause this fuse to blow. If fuse
replacement is required, use ONLY a 3-amp. fuse of identical
size. (See Figure 39 and Figure 40)
See the Service and Technical Support manual for detailed
instructions on control wiring and setup.

Thermostats

and Control

Settings

Alternate Power Supplies

For best results, use a communicating wall control to control
this modulating furnace. A single stage or two-stage heating
and cooling thermostat can be used with the furnace. The
furnace control board CPU will control the furnace and outdoor
unit staging. A two stage heating and cooling thermostat can
also be used to control the staging. However, full modulating
capability will not be available when the furnace staging is
controlled by the thermostat. Furnace staging will be limited to
Minimum and Maximum inputs or Intermediate and Maximum
inputs depending on the configuration
of set-up switches
SWl-2 and SW4-2. Refer to typical thermostat wiring diagrams
and the Sequence of Operation section for additional details.
Consult the thermostat installation instructions for specific
information about configuring the thermostat.

Accessories
1.

male 1/4-in quick-connect
terminals on the control
board marked EAC-1 and EAC-2. The terminals are
rated for 115VAC, 1.0 amps maximum and are
energized during blower motor operation.
Humidifier (HUM)
The HUM terminal is a 24 VAC output, energized
when the blower is operating during a call for heat.

This furnace is designed to operate on a utility generated
power which has a smooth sinusoidat waveform. If the furnace
is to be operated on a generator or other alternate power
supply, the alternate power supply must produce a smooth
sinusoidal waveform for compatibility with furnace electronics.
The alternate power supply must generate the same voltage,
phase, and frequency (Hz) as shown in Table 11 or on the
furnace rating plate.
Power from an alternate power supply that non-sinusoidat
damage the furnace or cause erratic furnace operation.
Contact
the alternate
specifications and details.

power

supply

may

manufacturer

for

(See Figure 39 and Figure 40)

Electronic Air Cleaner (EAC)
Connect an accessory Electronic Air Cleaner (if used)
using 1/4-in female quick connect terminals to the two

Table 11

Electrical Data - MODULATING

MINIMUM
WIRE
SIZE
AWG

MAXIMUM
WIRE
LENGTH
FT (M):_

12.7

14

29 (8.8)

MAXIMUM
FUSE OR
CKT BKR
AMPS_
15

19.1

12

30 (9.1)

20

9.7

12.7

14

29 (8.8)

15

104

14.8

19.1

12

30 (9.1)

20

127

104

14.8

19.1

12

30 (9.1)

20

127

104

14.8

19.1

12

30 (9.1)

20

OPERATING VOLTAGE
RANGE*

VOLTSHERTZPHASE

Maximum*

0601714

115-60-1

127

104

9.7

0602120

115-60-1

127

104

14.8

0801714

115-60-1

127

104

0802120

115-60-1

127

1002122

115-60-1

1202422

115-60-1

UNIT SIZE

(F/G)9MAC

Minimum*

MAXIMUM
UNIT
AMPS

UNIT
AMPACITY#

Permissible limits of the voltage range at which the unit operates satisfactorily.
# Unit ampacity = 125 percent of largest operating component's full load amps plus 100 percent of all other potential operating components'
amps.
1-Time-delay type is recommended.
$ Length shown is as measured one way along wire path between

440 01 4201 03

unit and service panel for maximum

Specifications

subject

to change

without

(EAC, humidifier,

etc.) full load

2 percent voltage drop.

notice.

31

Figure39

1Isolation Relay for Humidifiers with Internal Power Supply

0

To Humidifier Leads

To HUM Terminal On
Furnace Control Board

I

24 V
Coil

To Humidifier Leads

0

To Com/24V Screw Terminal
on Thermostat Strip
Al1157

Figure 40

I Variable Speed Furnace Control - Switch Locations
OAT

SW4

P,4
SW-1

SW2

SW3
.q

L11F080

32

Specifications

subject

to change

without

notice.

440 01 4201

03

Figure 40 - continued

Example of Variable Speed Furnace Control for ECM Blower Motor (Modulating)
COMMUNICATION
CONNECTOR

MODEL

CONTINUOUS
(CF)

PLUG

SETUP

FAN

AIRFLOW
SWITCHES

OUTDOOR

SW4

AIR

SWITCHES

TEMP

SETUP

CONNECTOR

PL8

MODULATING

CONNECTOR

SWITCHES

_ _4

AND

_

/ OAT
_ ,/

/

SLOWERDELAyOFF _

AIR CONDITIONING
(A/C) AIRFLOW
SETUP SWITCHES

-.............

PL8

_

TERMINAL

_* I t /_ I
d;=T=_=

24 V THERMOSTAT
TERMINALS

0.5 AMP

........

I v
_" _

(24A!AC

MAX.

ACRDJ

FLASH
UPGRADE
CONNECTOR

/ I

(FACTORY

STATUS AND COMM
LED LIGHTS

-----'----"-"

s_O COMM
O_

3 AMP

FUSE

/_

_ =_::::_:::=_

_

PL3 6 ECM SLOWER
ONLY)
CONNECTOR

s_'c
TRANSFORMER
24
CONNECTIONS

115

I_

I_

HARNESS

VAC

VAC (L2) NEUTRAL
CONNECTIONS

t

PL1 6 LOW VOLTAGE
MAIN
HARNESS CONNECTOR
SOFTWARE
VERSION

N

EAC 1 TERMINAL
(t15
VAC 1.0 AMP MAX.)

115 VAC (L1) LtNE
VOLTAGE
CONNECTIONS

,%T2OT,cE
g Pof
MOTOR

CONNECTOR

Lll F091

VENTING
NOTE: Planning for the venting system should be done in
conjunction with planning for the ductwork, drainage, and
furnace accessories, such as air cleaners and humidifiers.
Begin assembling the venting system AFTER the furnace is set
in place in the required orientation.
Venting for this furnace shall follow all Local codes for category
IV venting systems. This furnace is CSA approved for venting
with PVC/ABS DWV venting systems. This furnace is also CSA
approved
for venting
the M&G
DuraVent ® PolyPro ®
polyproplylene venting systems.
NOTE:
THESE
INSTRUCTIONS
DO NOT
CONTAIN
DETAILED
INSTALLATION
INSTRUCTIONS
FOR
POLYPROPYLENE
VENTING
SYSTEMS.
Refer to the
polyproplylene
venting
system manufacturer's
installation
instructions for the polyproplylene venting system installation.
NOTE: When using polypropylene venting systems, all venting
materials used, including the vent terminations, must be from
the same manufacturer.

Special Venting
in Canada

Requirements

for Installations

Installation in Canada must conform to the requirements of
CAN/CSA B149 code. Vent systems must be composed of
pipe, fittings, cements, and primers listed to ULC S636. The
special vent fittings, accessory concentric vent termination kits,
and accessory external drain trap available from the furnace
manufacturer have been certified to ULC $636 for use with
those Royal Pipe and IPEX PVC vent components which have
been certified to this standard.
In Canada, the primer and
cement must be of the same manufacturer as the vent system
- GVS-65 Primer (Purple) for Royal Pipe or IPEX System 636,
PVC/CPVC Primer, Purple Violet for Flue Gas Venting and
440 01 4201 03

Specifications

subject

GVS-65 PVC Solvent Cement for Royal Pipe or IPEX System
636(1)t, PVC Cement for Flue Gas Venting, rated Class IIA, 65
deg C. must be used with this venting system - do not mix
primers and cements from one manufacturer with a vent
system
from
a different
manufacturer.
Follow
the
manufacturer's instructions in the use of primer and cement
and never use primer or cement beyond its expiration date.
The safe operation, as defined by ULC $636, of the vent
system is based on following these installation instructions, the
vent system manufacturer's installation instructions, and proper
use of primer and cement. All fire stop and roof flashing used
with this system must be UL listed material. Acceptability under
Canadian standard CAN/CSA B149 is dependent upon full
compliance
with alt installation
instructions.
Under this
standard, it is recommended that the vent system be checked
once a year by qualified service personnel.
The authority having jurisdiction (gas inspection authority,
municipal building department, fire department, etc) should be
consulted before installation to determine the need to obtain a
permit.
*IPEX System 636 _' is a trademark of IPEX Inc.

Consignes
ventilation

sp6ciales pour I'installation
au Canada

de

L'installation faite au Canada doit se conformer aux exigences
du code CAN/CSA B149-2010. Ce syst_me de ventillation dolt
se composer
de tuyaux,
raccords,
ciments et appr_ts
conformes au ULC $636. La tuyauterie de ventilation des gaz,
ses accessoires, le terminal concentrique mural ainsi que
I'ensembte du drain de condensation exterieur fourni par le
fabricant de cette fournaise ont 6te certifies ULC S636 pour
I'application des composantes Royal Pipe, IPEX PVC qui sont
certifiees & ce standard.
Au Canada, I'appr_t et le ciment
doivent _tre du m_me fabricant que le systeme d'evacuation.
to change

without

notice.

33

Uappr_t GVS-65 (Purple) et le ciment-solvant GVS-65 doivent
_tre utilise avec les Royal Pipe. Systeme IPEX 636, appr_t
PVC/CPVC, Purple pour evacuation des gaz de combustion et
systeme IPEX 636(1)t, ciment PVC pour evacuation des gaz
de combustion, cote classe IIA, 65 deg C. doivent _tre utilises
avec le systeme d'evacuation IPEX 636 - Ne pas combiner I
'appr_t et le ciment d'un manufacturier
avec un systeme
d'evacuation d'un manufacturier different.
Bien suivre les indications du manufacturier Iors de I'utilisation de
I'appr_t et du ciment et ne pas utiliser ceux-ci si la date
d'expiration est atteinte.
Uoperation securitaire, tel que definit par ULC S636, du systeme
de ventilation est base sur les instructions d'instaltation suivantes,
ainsi que I'usage approprie de I'appr_t et ciment. Tout arret feu et
solin de toit utilises avec ce systeme doivent _tre des materiaux
listes UL. L'acceptation du standard Canadien CAN/CSA B149
est directement relie & rinstallation conforme aux instructions cihaut mentionnees. Le standard Canadien recommande I'
inspection par un personel qualifie et ce, une fois par annee.
Les autoritees ayant juridiction (inspecteurs de gas, inspecteurs
en b&timents, departement des incendies, etc) devraient _tre
consultees avant I'installation afin de determiner si un permis est
requis.

CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each appliance
connected to the venting system being placed into operation
could result in carbon monoxide poisoning or death.
Failure to follow the steps outlined below for each appliance
connected to the venting system being placed into operation
could result in carbon monoxide poisoning or death.
1. Seal any unused openings in venting system.
2. Inspect the venting system for proper size and horizontal pitch, as required in the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 or the CSA B149.1 Natural Gas and Propane Installation Code and these instructions. Determine that there is no blockage or restriction, leakage, corrosion and other deficiencies,
which could cause an unsafe condition.
3. As far as practical, close all building doors and windows and all doors between the space in which the appliance(s) connected to the venting system are located and other spaces of the building.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not connected to the venting system. Turn on any exhaust fans,
such as range hoods and bathroom exhausts, so they
are operating at maximum speed. Do not operate a
summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the thermostat
so appliance is operating continuously.
7. Test for spillage from draft hood equipped appliances
at the draft hood relief opening after 5 minutes of main
burner operation. Use the flame of a match or candle.
8. If improper venting is observed during any of the
above tests, the venting system must be corrected in
accordance with the National Fuel Gas Code, ANSI
Z223.1/NFPA 54 and/or CSA B149.1 Natural Gas and
Propane Installation Code.
9. After it has been determined that each appliance connected to the venting system properly vents when
tested as outlined above, return doors, windows, exhaust fans, fireplace dampers and any other gas-fired
burning appliance to their previous conditions of use.

34

Specifications

subject

General
If this furnace replaces a furnace that was connected to a vent
system or chimney, the vent or vent connectors of other
remaining appliances may need to be re-sized. Vent systems
or vent connectors of other appliances must be sized to the
minimum size as determined using appropriate table found in
the current edition of National Fuel Gas Code NFPA 54/ANSI
Z-223.1. In Canada, refer to CAN/CSA-B149.1
An abandoned masonry chimney may be used as a raceway
for properly insulated and supported combustion-air
(when
applicable) and vent pipes. Each furnace must have its own set
of combustion-air
and vent pipes and be terminated
individually, as shown in Figure 47 for Direct Vent (2-pipe)
system or Figure 48 for ventilated combustion air option.
A furnace shall not be connected to a chimney flue serving a
separate appliance designed to burn solid fuel.
Other gas appliances with their own venting system may also
use the abandoned chimney as a raceway providing it is
permitted by local code, the current edition of the National Fuel
Gas Code and the vent or liner manufacturer's installation
instructions. Care must be taken to prevent the exhaust gases
from one appliance from contaminating the combustion air of
other gas appliances.
Do not take combustion air from inside the chimney when using
ventilated combustion air or single pipe vent option.
These furnaces can be vented either as direct vent furnace, or
as ventilated combustion air system. Each type of venting
system is described below.
Common venting between
furnaces or other appliances prohibited.

Materials
U.S.A.
Combustion air and vent pipe, fittings, primers, and solvents
must conform to American National Standards Institute (ANSI)
standards and American Society for Testing and Materials
(ASTM) standards. See Table 13 for approved materials for
use in the U.S.A. This furnace is also CSA approved for venting
with M&G DuraVent®
PolyPro®
polyproplylene
venting
systems.

Canada
Special Venting Requirements
for Installations
in Canada
Installation in Canada must conform to the requirements of
CAN/CSA B149 code. Vent systems must be composed of
pipe, fittings, cements, and primers listed to ULC S636. M&G
DuraVent PolyPro polyproplylene venting systems are ULC
S636 listed.
NOTE: When using polypropylene venting systems, all venting
materials used, including the vent terminations, must be from
the same manufacturer.

to change

without

notice.

440 01 4201

03

Venting Systems
OPTIONAL
CONFIGURATION
INLET PIPE
CARBON MONOXIDE POISONING HAZARD
Failure to follow the instructions outlined in Locating the Vent
Termination for each appliance being placed into operation
could result in carbon monoxide poisoning or death.
For all venting configurations for this appliance and other gas
appliances placed into operation for the structure, provisions for
adequate combustion, ventilation, and dilution air must be
3rovided in accordance with:
U.S.A. Installations: Section 9.3 NFPA 54/ANSI Z223.1
1-2009, Air for Combustion and Ventilation and applicable
3rovisions of the local building codes.
Canadian Installations:
Part 8 of CAN/CSA-B149.1-10.
Venting Systems and Air Supply for Appliances and atl
authorities having jurisdiction.

RECOMMENDED

SUPPORT FOR VENT TERMINATIONS

It is recommended that sidewall vent terminations of over 24
inches (0.6 M) in length or rooftop vent terminations of over
36 inches (1 M) in length be supported by EITHER the factory accessory vent termination kit or field-supplied brackets
or supports attached to the structure. A factory accessory
vent termination kit may be used for direct vent terminations.
Termination kits are available for 2-in. or 3-in. pipe. See
Table 12 for available options.
A factory accessory concentric vent termination kit is available
for direct vent terminations. Concentric vent termination kits are
available for 2-in. and 3-in. pipe. See Table 12 for available
options.
Table

12

DirectVent (2-pipe)
Termination Kit

Vent Termination
Kit for Direct
Vent (2-pipe)
Systems
Diam, Of
Termination
Combustion Air
System
and Vent Pipes
in,(mm)

2-in (51 mm) Concentric
Vent Kit

Single Penetration
of Wall or Roof

1, 1-1/2, 2, or 2-1/2
(25, 38, 51, 64 mm)

3-in (76 mm) Concentric
Vent Kit

Single Penetration
of Wall or Roof

2-1/2, 3 or 4
(64, 76, 102 mm)

Termination
Bracket Kit

2-Pipe
Termination
System

1, 1-1/2, 2, or 2-1/2

Termination
Bracket

2-Pipe
Termination
System

2-in

3-in

(51 mm)

(76 mm)

Direct Vent / 2-Pipe

(25, 38, 51, 64 mm)
2-1/2, 3 or 4
(64, 76, 102 mm)

System

In a direct vent (2-pipe) system, all air for combustion is taken
directly from outdoor atmosphere, and all flue products are
discharged to outdoor atmosphere. Combustion-air and vent
pipes must terminate together in the same atmospheric
pressure zone, either through the roof (preferred) or a sidewall.
See
Figure57
for references to clearances required by
National code authorities.

440 01 4201 03

Specifications

subject

FOR

COMBUSTION

AIR

In applications where there is a risk of excessive moisture
entering the combustion air inlet pipe, a moisture trap may be
added to the inlet pipe to help prevent moisture from entering
the furnace from the combustion air inlet pipe. See
Figure 49.
When sizing venting systems, the equivalent length of the
optional inlet pipe moisture trap must be taken into account.

Ventilated

Combustion

Air Systems

In a ventilated combustion air option, the vent terminates and
discharges the flue products directly to the outdoors similar to a
direct vent system. See Figure 58 for references to clearances
required by National code authorities.
All air for combustion is piped directly to the furnace from a
space that is well ventilated with outdoor air (such as an attic or
crawl space) and the space is well isolated from the living
space or garage. Combustion air requirements for this option
are the same as the requirements for providing outside air for
combustion for a single pipe vent system. Refer to the "Air For
Combustion and Ventilation Section."

OPTIONAL VENTING BELOW THE FURNACE
The venting system may be positioned below the furnace
ONLY IF the factory accessory External Vent Trap Kit is used.
The External Vent Trap Kit is only approved for PVC/ABS
DWV venting systems.
CAREFULLY FOLLOW THE INSTRUCTIONS PROVIDED
WITH THE EXTERNAL VENT TRAP KIT FOR LAYING OUT
THE VENTING SYSTEM AND THE DRAIN SYSTEM. The
instructions included with this furnace DO NOT APPLY to
vent systems that are located below the furnace

CARBON MONOXIDE POISONING HAZARD
Failure to follow the instructions outlined in Locating the Vent
Termination for each appliance being placed into operation
could result in carbon monoxide poisoning or death.
The instructions included with this furnace DO NOT APPLY
to vent systems that are located below the furnace. CAREFULLY FOLLOW THE INSTRUCTIONS PROVIDED WITH
THE EXTERNAL VENT TRAP KIT FOR LAYING OUT THE
VENTING SYSTEM AND THE DRAIN SYSTEM when all or
part of the venting system is placed below the furnace.
Proper configuration of the venting and drain system is critical when placing all or part of the venting system below the
level of the furnace. VENT GASSES COULD BE RELEASED
FROM THE DRAINAGE SYSTEM, if the instructions
provided with the External Vent Trap Kit are not followed.

to change

without

notice.

35

Table13
Approved
ASTM
SPECIFICATION
MATERIAL
(MARKED
ON
MATERIA_
D1527
ABS
D1785
PVC
D2235
For ABS
D2241
PVC
D2466
PVC
D2468
ABS
D2564
For PVC
D2661
ABS
D2665
PVC
F438
CPVC
F441
CPVC
F442
CPVC
F493
For CPVC

Combustion-Air

and Vent Pipe, Fitting and Cement Materials (U.S.A. Installation)

PIPE

FITTINGS

Pipe
Pipe
-

Fittings
Fittings
-

Pipe
Pipe

Fittings
Fittings

Pipe
Pipe
-

Fittings
-

Pipe

-

F656

For PVC

-

-

F891

PVC

Pipe

-

Figure 41

Schedule-40
For ABS
SDR-21 & SDR-26
Schedule-40

Solvent Cement

-

ABS

DESCRIPTION

Schedule-40

Pipe

F628

SOLVENT CEMENT AND
PRIMERS

Solvent Cement

Solvent Cement

Schedule-40
For PVC
DWV at Schedule-40 IPS sizes
DWV
Schedule-40
Schedule-40
SDR
For CPVC
Cellular Core DWV at Schedule-40
sizes

Primer

For PVC
Cellular Core Schedule-40

Vent Coupling and Adapter with
Gaskets

Figure 42

IPS

Vent Pipe

& DWV

Flush with Adaptor

VENT PIPE ADAPTER WITH GASKET
INSTALLED ON FURNACE VENT
PIPE IS CUT FLUSH WITH TOP OF
ADAPTER.

L
Vent Coupling and Adapter
A11339A

Figure 43

Vent Pipe

Flush

Showing

Coupling

ALIGN NOTCHES IN VENT PIPE
COUPLING OVER STAND-OFF
ON ADAPTER. TORQUE LOWER
CLAMP 15 LB-IN. WHEN REMAINING
VENT PIPE IS INSTALLED, TORQUE
UPPER CLAMP TO 15 LB-IN.

Attach gaskets to vent pipe and combustion

air adapters.

Al1314

A11889B

36

Specifications

subject

to change

without

notice.

440 01 4201

03

Locating the Vent Termination
General
NOTE:
Termination Requirements for the Provinces of
Alberta and Saskatchewan are located at the end of this
section.
Combustion-air inlet pipe (Direct Bent/2-Pipe system only) and
vent pipe must terminate outside structure, either through
sidewall or roof.
For vent termination clearance, references to National codes
are shown in Figure 57 for Direct Vent/2-Pipe
system and
Figure 58 for Ventilated Combustion Air system. For exterior
termination
arrangements,
refer to Figure57
for Direct
Vent/2-Pipe system and Figure 58 for Ventilated Combustion
Air system.
Contact
Local code authorities
for other
requirements to and/or exemptions from the National codes
shown in the figures.
Roof termination is often preferred since it is less susceptible to
damage or contamination,
is usually located away from
adjacent structures, is less prone to icing conditions, and often
has less visible vent vapors. Sidewall terminations may require
sealing or shielding of building surfaces with a corrosive
resistance
material
due to the corrosive
properties
of
combustion products from vent system as well as protection of
adjacent structures.

RECOMMENDED

SUPPORT FOR VENT TERMINATIONS

location for termination,

1. Comply with all clearance
requirements
Figure 57 or Figure 58 per application.

consider
stated

in

2. Termination or termination kit should be positioned where
vent vapors will not damage
plants/shrubs
or air
conditioning equipment.
3. Termination or termination kit should be positioned so
that it will not be affected by wind eddy, such as inside
building corners, nor by recirculation of flue gases,
airborne leaves, or light snow.
4. Termination or termination kit should be positioned where
it will not be damaged by or subjected to foreign objects
such as stones, balls, etc.
5. Termination or termination kit should be positioned where
vent vapors are not objectionable.

Direct Vent / 2-Pipe

For all venting configurations for this appliance and other gas
appliances placed into operation for the structure, provisions
for adequate combustion, ventilation, and dilution air must be
provided in accordance with:
U.S.A. Installations:
Section 9.3 NFPA 54/ANSI Z223.1
1-2009, Air for Combustion and Ventilation and applicable
provisions of the local building codes.
Canadian Installations:
Part 8 of CAN/CSA-B149.1-10.
Venting Systems and Air Supply for Appliances and all
authorities having jurisdiction.

Ventilated

Combustion

Air

The vent pipe for a Ventilated Combustion Air System must
terminate outdoors. See Figure57
for references to vent
clearances required by National code authorities. Allowable
vent terminations are shown in Figure 48. The combustion air
pipe terminates in a welt-ventilated attic or crawl space. Follow
the clearances as shown in Figure 55 and Figure 56.
The combustion air pipe cannot terminate in attics or crawl
spaces that use ventilation fans designed to operate in the
heating season. If ventilation fans are present in these areas,
the combustion air pipe must terminate outdoors as a Direct
Vent System.

Termination
Requirements
for the
Provinces of Alberta and Saskatchewan

It is recommended that side-wall vent terminations in excess
of 24 inches (0.6 M) or rooftop terminations in excess of 36
inches (1.0 M) in vertical length be supported by EITHER the
Direct Vent Termination Kit shown in Table 12 or by
field-supplied brackets or supports fastened to the structure.
When determining appropriate
the following guidelines:

CARBON MONOXIDE POISONING HAZARD
Failure to follow the instructions outlined below for each
appliance being placed into operation could result in carbon
monoxide poisoning or death.

System

Direct vent (2-pipe) vent and combustion air pipes must
terminate outside the structure. See Figure 57 for references to
vent clearances
required by National code authorities.
Allowable vent and combustion air terminations are shown in
Figure 47.

The Provinces of Alberta and Saskatchewan
require a
minimum unobstructed
distance of 4 ft. (1.2m) from the
foundation to the property line of the adjacent lot for vent
termination of any appliance with an input over 35,000 btuh. If
there is less than 4 ft. (1.2m) of unobstructed distance to the
property line of the adjacent lot, no type of vent termination is
permitted for appliances with inputs greater than 35,000 btuh.
There are no additional restrictions on unobstructed distances
greater than 8 ft. (2.4m). All single, 2-pipe and concentric vents
may be used, providing all other Code and manufacturer's
requirements in these instructions are adhered to. Refer to the
appropriate Vent Termination
section above for locating the
vent termination.
If the unobstructed distance from the foundation to the property
line of the adjacent lot is no less than 4 ft. (1.2m) and no
greater than 8 ft. (2.4m), it will be necessary to re-direct the flue
gas plume. In this situation, a concentric vent kit cannot be
used. A 2-pipe termination (or single pipe termination when
permitted) that re-directs the flue gas away by use of an elbow
or tee, certified to ULC $636 from the adjacent property line
must be used. (See Figure 44 and Figure 46)
The concentric vent kit currently cannot be modified to attach
an elbow to the vent portion of the rain cap. A tee attached to
the rain cap could potentially direct the flue gas plume toward
the intake air stream and contaminate the incoming combustion
air for the furnace.
Refer to Figure 44 and Figure 46 for terminations approved for
use in Alberta and Saskatchewan.

440 01 4201 03

Specifications

subject

to change

without

notice.

37

Figure 44

I Tee at Termination

Outlet
Figure 45

Sample Inlet Air Pipe Connection
for Polypropylene Venting Systems

EXAMPLE FOR
UPFLOW INSTALLATIONS.
MAY BE APPLIED TO
OTHER CONFIGURATIONS.

OPTIONALTERMINATION
BRACKETFOR 2 PiPE
TERMINATIONS

12-in
30.48 cm
Above anticipated
snow level

L12F030

A12220

Figure 46

IVent Terminations

OVERHANG

Clearance

to overhang

per code

For single pipe vent
.....
"'_

degree elbowinstall
pointing
applications,
a 45
downward

J
SEPARATION

COMBUSTION AIR

LEVEL

(ELBOW

WHICHEVER

TO WALL)

38

PARALLEL

OR

12 hi (3048mm)
M_N Ground
Leve_ OR S#ow Level

GRADE,
IS

GREATER

L12F031

Specifications

subject

to change

without

notice.

440 01 4201

03

Figure 47

_Combustion

Air and Vent Pipe Termination for Direct Vent (2-Pipe) System
Roof Termination

(Preferred)
Note:
36
Note:

Vertical separation
between
combustion
air and vent

'A" denotes

8 _t in. (222mm)

or 3 in.(76mm)

6 _i in. (172mm)

or 2in. (51mm)_

I_A,_
\

Maintain 12 in. (305mm)
min. Clearance
above

be 36 in. Away

(914mm)

36in.

\,

_[/

highest anticipated
snow
level maximum
of 24 in.
(614ram) above roof

_-i
_J

_

.

:_

_2r:_/

_

(914mm)

A

$

Maintain

-6,_

_,
Vent

Concentric
Roof

12 in (305ram)

abovehighestanticipated

and

Termination

Combustion

maxi
Air ......

(preferred)

f24

min CI.......
.....

in. (6t4mm)ab

level

......

f

t in. (25ram) maximum
(Typ.) from wall to inlet

"
Abandoned
as raceway

between

.........

.............

H t........................
b_;igast

\

separation

0 To 2 in. (51 mm)

Between
first 2vent,
vents if Third
vent
(andthefourth
used)
must

in.

pairs of inlets only required
for direct
vent systems

masonry used
(per code)
12 in. From Overhang
or roof (Typ.)

Concentric
Vent
Side Termination

and Combuetion

Air"

} in. 1'
(914mm)_ ....... _
.........

12 in. Min from
overhang
or
roof (Typ.)

Maintain
12 in. (305mm) min. Clear
ance above highest anticipated
snow
level or grade whichever
is greater
(Typ.)

Side wall termination
of
less than 12 in. (3O5mm)
above highest snow level
Note:
_,t least 36 in.
(914mm)
between bottom of com
bustion air and bottom of

'A" denotes 0 To 2 in. (51 mm)
Between the first 2 vents Third
vent (and fourth vent, if used) must
be 36 in. Away (914mm)

vent (Typ.)
(914mm)

Maintain
12 in. (305ram) min.
Clearance
above highest an
ticipated
snow level or grade
whichever
is greater (Typ.)

\\\\\\

L12F032

Figure 48

Vent Pipe Termination for Ventilated Combustion Air System
Roof Termination (Preferred)

minimum

(305ram)
clearance

above highest
anticipated
snow level maxim um of
24 _n (610ram)

above

roof

Abandoned masonry
used as raceway
(percode)

12 in m_n (305 ram)from
overhang
or roof
6 in
152mm)
m_n_mum
bergen
wa _ and end o
10 in

(254mm)

m_imum

clearance
vent pipe
pipe

lengh

Maintain
m_nimum

12 in (305ram)
clearance

above h_ghest anticipated
snow level or grade
whichever
is greater
Sidewall
w_th Straight

Maintain
m_nimum

Ter m_nation
P_pe (preferred)

12 in (305ram)
clearance

above h_ghest anticipated
snow level or grade
whichever
is greater
S_de wall term_naSon
w_h

2 elbows

(preferred)

A05091

Size the Vent and Combustion
General

change should be made outside furnace casing in vertical pipe.
Any change in diameter to the pipe must be made as close to
the furnace as reasonably possible.

Air Pipes

Furnace combustion air and vent pipe connections are sized
for 2-in. (50 mm ND) PVC/ABS DWV pipe. The combustion air
and vent
pipe connections
also accommodate
60mm
polypropylene
venting systems with outside diameters of
approximately
60 mm (2-3/8 inches). Any pipe diameter

440 01 4201 03

Specifications

subject

The Maximum Vent Length for the vent pipe and combustion air
pipe equals the Maximum Equivalent Vent Length (MEVL) in
Table 14 or Table 16, minus the number of fittings multiplied by
the deduction for each type of fitting used from Table 15.

to change

without

notice.

39

Optional Combustion
Moisture Trap
OPTIONAL
CONFIGURATION
INLET PIPE

FOR

COMBUSTION

AIR

As an option to prevent moisture from trickling into the furnace
vestibule, a trap can be installed in the intake air pipe near the
furnace. Connecting a drain line to the trap is optional as trace
amounts of moisture will evaporate into the intake air stream. If
the combustion air inlet is located near a moisture exhaust
duct, or there are other concerns of excessive moisture being
drawn into the combustion air inlet, it is encouraged to connect
a drain line to the trap.
The trap can be constructed from a running tee of the same
diameter of the intake air pipe with EITHER a removable cap
attached to a 6-inch long pipe connected to the tee or the
External vent Trap Kit to help prevent contaminants from
entering the furnace. See Figure 49.

In applications where there is a risk of excessive moisture
entering the combustion air inlet pipe, a moisture trap may be
added to the inlet pipe to help prevent moisture from entering
the furnace from the combustion air inlet pipe. See
Figure 49.
When sizing venting systems, the equivalent length of the
optional moisture trap (15 feet/5 M) must be taken into account

Figure 49

Air Inlet

I Optional Combustion Air Inlet Moisture Trap

_®

®

o-o
Q

TO CODE-APPROVED

DRAIN

OR CONDENSATE

PUMP

N
Representative

drawing only, some models may vary in appearance.

The External Vent Trap Kit accessory may be used as a trap for
the combustion air inlet pipe if a large amount of moisture must
be removed. The drain line may be connected to the same
drain as the furnace condensate and the evaporator coil
condensate line ONLY if the inlet air trap drain and the
evaporator coil drain empty into an open segment of pipe
above the drain, See Figure 12. When using the External Vent
Trap Kit, refer to those
instructions
for proper drain
connections.
The tee may also be connected to the intake air pipe on the
side of the casing. See Figure 49.
In any configuration, it will be necessary to add the equivalent
length of the tee (15 feet/5 M) to the Total Equivalent Vent
Length of the venting system.

40

Specifications

subject

to change

L12F028

ADDITIONAL
INFORMATION
FOR POLYPROPYLENE
VENTING SYSTEMS
Polypropylene venting systems include flexible vent pipe.
These flexible vent pipes have a different equivalent vent
length than straight sections of PVC/ABS DWV vent pipe. Be
sure to make the appropriate deductions from the Maximum
Equivalent Vent Length (MEVL), or additions to the Total
Equivalent Vent Length (TEVL), when applying flexible vent
pipes in polypropylene venting systems. See the polypropylene vent system manufacturer's installation instructions for
details.
When using metric-sized venting systems, use these equivatencies for obtaining the proper MEVL from the Tables:
Use 2" Vent Tables for 60mm (o.d.) vent systems
Use 3" Vent Tables for 80mm (o.d.) vent systems
Use 4" Vent Tables for 100mm (o.d.) vent systems

without

notice.

440 01 4201

03

The measured length of pipe used in a 2-pipe termination is
included in the total vent length. Include deductions from the
Maximum Equivalent Vent Length (MEVL) contained in the
Venting Tables for elbows and flexible vent pipe. Factory
accessory concentric vent terminations, or pipe lengths and
elbows used for "standard" vent terminations
(see vent
termination figures associated with Table 14) do not require a
deduction from the Maximum Equivalent Vent Length. Include a
deduction for a Tee when used for Alberta and Saskatchewan
terminations.
NOTE: Polypropylene venting systems MAY require additional
deductions from the MEVL, or additions to the TEVL, for vent
terminations and flexible pipe sections. See the polypropylene
venting system manufacturer's
instructions for details on
equivalent lengths of vent terminations and flexible vent pipes,
and for calculating total vent lengths.
To calculate the Total Equivalent Vent Length (TEVL) of the
venting system:
1. Measure the individual distance from the furnace to the
termination for each pipe.
2. Count the number of elbows for each pipe.
3. For each pipe, multiply the number of elbows by the
equivalent length for the type of elbow used. Record the
equivalent length of all the elbows for each pipe.
4. If a Tee is used on the termination
(Alberta and
Saskatchewan, when required), record the equivalent
length of the Tee used.
5. Calculate Total Equivalent Vent Length by adding the
equivalent lengths of the fittings to the lengths of the
individual vent and combustion air pipes.
6. When using polypropylene venting systems with flexible
vent pipes, perform adjustments for the equivalent length
of the flexible vent pipe to the calculated total equivalent
venting system length. See the polypropylene
vent
system manufacturer's instructions for details.
7. Select a diameter of vent pipe from
Table 14 and
Table 16 and note the Maximum Equivalent Vent Length
(MEVL) shown for that application for that specific
furnace input size. Compare the Total Equivalent Vent
Length (TEVL) to the MEVL:
a. If the Total Equivalent Vent Length is shorter than the
Maximum Equivalent Vent Length for the diameter of
pipe chosen, then that diameter of pipe selected may
be used.
b. If the Total Vent Length is longer than the Maximum
Equivalent Vent Length for the diameter of pipe
chosen, that diameter pipe MAY NOT be used for
venting the furnace. Try the next larger diameter pipe.
NOTE: If the calculated Total Equivalent Vent Lengths results
in different diameter pipes for the vent and combustion air,
select the larger diameter for both pipes.
NOTE: If the Maximum Vent Length for diameter of the pipe
selected is longer than the measured length and the equivalent
length of all the fittings and terminations (TEVL), recalculate
Total Equivalent Vent Length using the next smaller diameter. If
the Maximum Vent Length is still longer than the longer TEVL
of the vent pipe or combustion air pipe, then that diameter of
pipe selected may be used.
When installing vent systems with pipe lengths of 10 ft. (3.0 M)
or less, use the smallest allowable pipe diameter. Using pipe
size greater than required for short venting systems may result
in loss of efficiency, incomplete combustion, flame disturbance,
or flame sense lockout.

440 01 4201 03

Specifications

subject

For vent systems longer than 10 ft. (3.0 M), any larger diameter
shown in Table 14 and Table 16 for that size model may be
used.

Combustion
Guidelines

Air and Vent Piping Insulation

NOTE: Use closed cell, neoprene insulation or equivalent.
The vent pipe may pass through unconditioned areas. The
amount of exposed pipe allowed is shown in Table 17.
1. Using
winter
design temperature
(used in load
calculations),
find appropriate
temperature
for your
application and furnace model.
2. Determine the amount of total and exposed vent pipe.
3. Determine required insulation thickness for exposed pipe
length(s).
4. When combustion air inlet piping is installed above a
suspended ceiling, the pipe MUST be insulated with
moisture resistant insulation such as Armaflex or other
equivalent type of insulation.
5. Insulate combustion air inlet piping when run in warm,
humid spaces.
6. Install the insulation per the insulation manufacturer's
installation instructions.
NOTE: Pipe length (ft / M) specified for maximum pipe lengths
located in unconditioned spaces (See Table 17) cannot exceed
total allowable pipe length as calculated from Table 14 or
Table 16.

Configure

the Furnace

CARBON MONOXIDE POISONING

HAZARD

Failure to follow this warning could result in personal injury or
death.
To route the vent pipe and combustion air pipe through the
furnace, the manufacturer supplied kit must be used. Failure
to properly seal the blower compartment from the furnace
vestibule could result in the circulation of carbon monoxide
throughout the structure. The vent pipe and combustion air
pipe must be a continuous pipe while passing through the
blower compartment.
Seals supplied in this kit must be
installed per the instructions provided. Follow all procedures
outlined in these instructions.

Install the Vent and Combustion

Air Pipes

With the furnace installed in the required position, remove the
desired knockouts from the casing. It will be necessary to
remove one knockout for the vent pipe and the other knockout
for the combustion air connection. (See Figure 13)
Use a flat blade screwdriver and tap on the knockout on
opposite sides, where the knockout meets the casing. Fold the
knockout down with duct pliers and work the knockout back
and forth until it is removed. Trim any excess metal from the
knockout with tin snips.
The vent elbow can be rotated to the required location on the
casing if necessary. See Figure 50 To rotate the vent elbow:
1. Loosen the clamp on the inlet of the vent elbow attached
to the inducer.
2. Rotate the vent elbow to the required position. There are
rounded notches in the vent elbow to align it with the
inducer for each orientation.
3. Tighten the clamp around the vent elbow. Torque the
clamp to 15 Ib-in. See Figure 51 through Figure 54.

to change

without

notice.

41

Figure 50

Upflow Configurations

Inducer Vent Elbow - Variable

- continued

/

/

/

jjJfJJ

MODULATING

INDUCER

Any otherunused 5)

requiredposition.

Upflow Configurations

"" ........

Any _
'-

-_._ckout

_used
m,_,y be used

for _nr_ctlon.
for cetnb_dion

_4"_m
'. V .59

"

air

- Rotate verst elbow t_
required position.

DOWNFLOW
UPFLOW
Representative

Representative

LEFT - VENT CONFIGURATION

Al1311

drawing only, some models may vary in appearance.
Al1309

/

_0

._

_ , _ k..

'_

_',",/

Rotateventelbow
to
required position.

'

DOWNFLOW
Representative
Rotate vent elbow to
rl_uiil_d

UPFLOW
Representative

po_i_en

i

f/ _

_ axe:t-:

_t)\

}

......

_ --

LEFT - VENT CONFIGURATION

drawing only, some models may vary in appearance.

drawing

RIGHT - VENT CONFIGURATION
only, some

models

may vary in appearance.
Al1312

_ _ -

* See NOTES following figures.

RIGHT - VENT CONFIGURATION

drawing only, some models may vary in appearance.
Al1308

42

Specifications

subject

to change

without

notice.

440 01 4201

03

Downflow

Configurations

- continued

Horizontal Left Configurations

- continued

©

l
HORIZONTAL

LEFT - RIGHT VENT CONFIGURATION*

* Requires accessory
Representative

DOWNFLOW VERTICAL - VENT CONFIGURATION
Requires Accessory Internal Vent Kit
See Specification Sheets for current kit number
Representative

Al1329

Internal Vent Kit

drawing only, some models may vary in appearance.

* See NOTES following figures.

drawing only, some models may vary in appearance.
L11F063

Figure 54

1Horizontal Right Configurations

* See NOTES following figures.

Figure 53

_Horizontal

Left Configurations

COMBUSTION
CONNECTmONS

AI1327

HORIZONTAL
Representative

HORIZONTAL
Representative

LEFT - VERTICAL VENT CONFIGURATION

RIGHT - VERTICAL
drawing

only, some

VENT CONFIGURATION
models

AI 1337

may vary in appearance.

drawing only, some models may vary in appearance.

A11328

HORIZONTAL
Representative

LEFT - LEFT VENT CONFIGURATION

drawing only, some models may vary in appearance.

HORIZONTAL
Representative

RIGHT - LEFT VENT CONFIGURATION

A11336

drawing only, some models may vary in appearance.

* See NOTES following figures.

440 01 4201 03

Specifications subject to change without notice.

43

Horizontal

Right Configurations

1. Apply the gaskets to the vent pipe and combustion air
pipe adapters. If supplied, remove and discard round
center "slug" from interior of gasket. See Figure 41.
NOTE: The vent pipe adapter can be distinguished from the
inlet pipe adapter by the absence of an internal pipe-stopping
ring. The vent pipe can pass through the vent pipe adapter; it
cannot pass through the inlet pipe adapter.

- continued

ALTERNATE

COMBUSTION
AIR

2. Align the screw holes in the plastic vent pipe adapter with
the dimples in the casing.
3. Pilot drill the screw holes for the adapter in the casing
and attach the vent pipe adapter to the furnace with
sheet metal screws
4. Slide the end of the rubber vent coupling with notches in
it over the standoffs on the vent pipe adapter.
5. Insert a length of vent pipe through the coupling into the
outlet of the vent elbow.
6. Tighten the clamp around the outlet of the vent elbow.
Torque the clamp to 15 Ib-in.
HORIZONTAL
Representative

AI 1335

RIGHT - RIGHT VENT CONFIGURATION

drawing only, some models may vary in appearance.

* See NOTES following figures.
NOTES:
1. Attach vent pipe adapter with gasket to furnace casing.
2. Align notches in rubber coupling over standoffs on
adapter. Slide clamps over the coupling.
3. Slide vent pipe through adapter and coupling into vent
elbow.
4. Insert vent pipe into vent elbow.
5. Torque all clamps 15-lb.-in.
6. Attach combustion air pipe adapter
furnace.

with

gasket

to

7. Attach combustion air pipe to adapter with silicone. Pilot
drill a ]/8-in.
Hole in adapter and secure with a #7 x
]/2-in. Sheet metal screw.

Installing the Vent Pipe Adapter
Combustion Air Pipe Adapter

CARBON MONOXIDE POISONING

and

HAZARD

Failure to follow this warning could result in personal injury or
death.
To route the vent pipe and combustion air pipe through the
furnace, the manufacturer supplied kit must be used. Failure
to properly seal the blower compartment from the furnace
vestibule could result in the circulation of carbon monoxide
throughout the structure. The vent pipe and combustion air
pipe must be a continuous pipe while passing through the
blower compartment.
Seals supplied in this kit must be
installed per the instructions provided. Follow all procedures
outlined in these instructions.

CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or
death.
DO NOT use cement to join polypropylene venting systems.
Follow the polypropylene
venting system manufacturer's
instructions for installing polypropylene venting systems.
NOTE: The rubber coupling that attaches to the vent pipe
adapter must be used. The adapter seals the vent pipe to the
casing and reduces the strain on the vent elbow attached to the
inducer.
44

Specifications

subject

to change

The following instructions are for PVC/ABS DWV vent piping,
only.
DO
NOT
USE
THESE
TECHNIQUES
FOR
POLYPROPYLENE
VENT PIPING SYSTEMS.
See the
polypropylene
vent system manufacturer's
instructions for
installing polypropylene venting systems.
Install the remaining vent and combustion air pipes as shown
below. It is recommended that all pipes be cut, prepared, and
preassembled before permanently cementing any joint.
1. Working from furnace to outside, cut pipe to required
length(s).
2. De-burr inside and outside of pipe.
3. Chamfer outside edge of pipe for better distribution of
primer and cement.
4. Clean and dry all surfaces to be joined.
5. Check dry fit of pipe and mark insertion depth on pipe.
6. Insert the vent pipe into the vent elbow.
7. Torque clamp on vent elbow 15 Ib-in.
8. Torque clamp on vent coupling 15 Ib-in.
9. Insert the combustion air pipe into the adapter.
10. Pilot drill a screw hole through the adapter into the
combustion air pipe and secure the pipe to the adapter
with sheet metal screws. DO NOT DRILL INTO
POLYPROPYLENE
VENT PIPES. Use an optional
accessory vent coupling, if needed.
11. Seal around the combustion air pipe with silicone or foil
tape.
SILICONE
SEALERS
MAY
NOT
BE
APPROPRIATE
FOR
POLYPROPYLENE
VENT
SYSTEMS. SEE POLYPROPYLENE
VENT SYSTEM
MANUFACTRUER'S INSTRUCTIONS.
12. After pipes have been cut and preassembled,
apply
generous layer of cement primer to pipe fitting socket
and end of pipe to insertion mark. Quickly apply
approved cement to end of pipe and fitting socket (over
primer). Apply cement in a light, uniform coat on inside of
socket to prevent buildup of excess cement. Apply
second coat. DO NOT CEMENT POLYPROPYLENE
FITTINGS.
13. While cement is still wet, twist pipe into socket with
1/4-in. turn. Be sure pipe is fully inserted into fitting
socket.
14. Wipe excess cement from joint. A continuous bead of
cement will be visible around perimeter of a properly
made joint.
15. Handle pipe joints carefully until cement sets.
16. Horizontal portions of the venting system shall be
supported to prevent sagging. Support combustion air
without

notice.

440 01 4201

03

piping and vent piping a minimum of every 5 ft. (1.5M) [3
ft. (.91M) for SDR-21 or -26 PVC] using perforated
metal hanging strap or commercially available hangars
designed to support plastic pipe.
17. Prevent condensate from accumulating in the pipes by
sloping the combustion
air piping and vent piping
downward towards furnace a minimum of 1/4-in. per
linear ft. with no sags between hangers.
18. Complete the vent and combustion air pipe installation
by connecting to the concentric vent or by installing the
required termination elbows as shown in Figure 46,
Figure 47, Figure 55 and
Figure 56. For ventilated
combustion air terminations, see Figure 48.
19. Use appropriate
methods to seal openings where
combustion air pipe and vent pipe pass through roof or
sidewall.

CARBON MONOXIDE POISONING

FOR POLYPROPYLENE VENTING SYSTEMS
When using polypropylene venting systems, all venting materials used, including the vent terminations, must be from the
same manufacturer.

Installing the Vent Termination
Roof Terminations
A roof termination of any type will require a 4-in. (102
flashing for a 2-in. (50 mm ND) concentric vent or a 5-in.
mm) diameter flashing for a 3-in. (80 mm ND) concentric
kit. For 2-pipe or single pipe vent systems, a flashing for
pipe of the required diameter will be necessary.

mm)
(127
vent
each

It is recommended that the flashing be installed by a roofer or
competent professional prior to installing the concentric vent.
The terminations can be installed on a flat or pitched roof.

HAZARD

Failure to follow this warning could result in personal injury or
death.
DO NOT use cement to join polypropylene venting systems.
Follow the polypropylene
venting system manufacturer's
instructions for installing polypropylene venting systems.
Optional
Installation
of the vent pipe
NOTE:
DO
NOT
USE
THIS
TECHNIQUE
POLYPROPYLENE VENTING SYSTEMS.

FOR

Concentric Vent
Single or multiple concentric vent must be installed as shown in
Figure 47. Maintain the required separation distance between
vents or pairs of vents as shown in Figure 47
and all
clearance shown in Figure 57.
NOTE:
Follow the instructions
of the vent terminal
manufacturer.
only.

These instructions

are provided as a reference

This option provides a disconnect point for the vent pipe. The
vent pipe must be cemented to the plastic vent pipe adapter to
maintain a sealed vestibule. See Figure 42 and Figure 43

Cut one 4-in. (102 mm) diameter hole for 2-in. (50 mm ND) kit,
or one 5-in. (127 mm) diameter hole for 3-in. (80 mm ND) kit in
the desired location.

1. Insert a length of vent pipe through the casing into the
outlet of the vent elbow.

Loosely assemble concentric vent/combustion air termination
components together using instructions in kit.
Slide assembled kit with rain shield REMOVED through hole in
wall or roof flashing.
NOTE: Do not allow insulation or other materials to accumulate
inside of pipe assembly when installing it through hole.

2. Slide the plastic vent pipe adapter over the length of the
vent pipe down to the furnace casing. Mark the pipe
where it is flush with the outlet of the adapter.
3. Remove the pipe from the furnace and the adapter and
cut off any excess pipe.
4. Clean and prime the end of the pipe that is flush with the
vent adapter with a primer that is appropriate for the type
of pipe being used.
5. Re-insert the pipe through the casing into the vent
elbow.
6. Tighten the clamp around the outlet of the vent elbow.
Torque the clamp to 15 Ib-in.
7. Apply cement to the end of the pipe and to the inside of
the plastic vent adapter.
8. Slide the adapter over the vent pipe and align the screw
holes in the adapter with the dimples in the furnace
casing.
9. Pilot drill 1/8-in. screw holes for the adapter in the casing
and secure the adapter to the furnace with sheet metal
screws.
10. Loosen the clamps on the rubber vent coupling.
11. Slide the end of the coupling with notches in it over the
standoffs in the vent pipe adapter.
12. Tighten the clamp of the coupling over the vent pipe
adapter. Torque the lower clamp around the vent pipe
adapter to 15 Ib-in.
13. Pilot drill a 1/8-in. hole in the combustion air pipe
adapter.
14. Complete the vent and combustion air pipe as shown in
"Install the Vent and Combustion Air Pipe"

Disassemble loose pipe fittings. Clean and cement using same
procedures as used for system piping. DO NOT CEMENT
POLYPROPYLENE FITTINGS.

Two-Pipe

(Direct

Vent)Terminations

Two pipe vent terminals must be installed as shown in
Figure 47 and Figure 48. Maintain the required separation
distance between vents or pairs of vents as shown in
Figure 47 and Figure 48 and all clearance shown in Figure 57
or Figure 58.

RECOMMENDED SUPPORT FOR VENT TERMINATIONS
It is recommended that rooftop vent terminations in excess of
36 inches (1.0 M) in vertical length be supported by EITHER the
Direct Vent Termination Kit shown in Table12
or by
fie d-supp ied brackets or supports fastened to the structure.
Cut the required number of holes in the roof or sidewall for vent
and combustion air pipes. Sidewall holes for 2-pipe vent
terminations should be side-by-side, allowing space between
the pipes for the elbows to fit on the pipes.
Holes in the roof for direct-vent (two-pipe) terminations should
be spaced no more than 18-in. (457 mm) apart to help avoid
vent gas recirculation into combustion air intake.
Termination elbows will be installed after the vent and (if used)
combustion air pipe is installed.

440 01 4201 03

Specifications

subject

to change

without

notice.

45

Sidewall Terminations
Concentric

Determine an appropriate location for termination kit using the
guidelines provided in section "Locating The Vent Termination"
in this instruction.

Vent

NOTE:
Follow the instructions
of the vent terminal
manufacturer. These instructions are provided as a reference,
only.
Determine an appropriate location for termination kit using the
guidelines provided in section "Locating The Vent Termination"
in this instruction.
1. Cut one 4-in. diameter hole for 2-in.
diameter hole for 3-in. kit.

kit, or one 5-in.

kit with rain shield REMOVED through

5. Disassemble loose pipe fittings. Clean and cement using
same procedures as used for system piping. DO NOT
CEMENT POLYPROPYLENE FITTINGS.

Termination

NOTE:
Follow the instructions
of the vent terminal
manufacturer. These instructions are provided as a reference,
only.

RECOMMENDED

SUPPORT

Air Terminations,

(Direct Vent / 2-Pipe System

4. Locate assembly through sidewall with rain shield
positioned no more than 1-in. (25 mm) from wall as
shown in Figure 47.

Vent (2-Pipe)

(if used) and place

4. Disassemble loose pipe fittings. Clean and cement using
same procedures as used for system piping. DO NOT
CEMENT POLYPROPYLENE FITTINGS.
For Ventilated Combustion
shown in Figure 48.

NOTE: Do not allow insulation or other materials to accumulate
inside of pipe assembly when installing it through hole.

Direct

2. Loosely install elbow in bracket
assembly on combustion-air pipe.

size for

3. Install bracket as shown in Figure 44 and Figure 46.
NOTE: For applications using vent pipe option indicated by
dashed lines in Figure 47 and Figure 48, rotate vent elbow 90 °
from position.

2. Loosely
assemble
concentric
vent/combustion
air
termination components together using instructions in kit.
3. Slide assembled
hole.

1. Cut two holes, one for each pipe, of appropriate
pipe size being used.

terminate

as

ONLY)

When two or more furnaces are vented near each other, two
vent terminations may be installed as shown in Figure 44 and
Figure46,
but next vent termination,
or pair of vent
terminations, must be at least 36-in. (914 mm) away from first
two terminations. It is important that vent terminations be made
as shown in Figure 44 and Figure 46 to avoid recirculation of
gases.

Inducer

Outlet

Restrictor

The loose parts bag may contain an inducer outlet restrictor.
The outlet restrictor is NOT used on these furnaces. Discard
restrictor.

FOR VENT TERMINATIONS

It is recommended that side-wall vent terminations in excess
of 24 inches (0.6 M) in vertical length be supported by
EITHER the Direct Vent Termination Kit in Table 12 or by
field-supplied brackets or supports fastened to the structure.

46

Specifications

subject

to change

without

notice.

440 01 4201

03

Figure 55

_Crawl Space Vent Termination
Ventilated Combustion
Air intake pipe

/
_1_

Pipe hangar

?

3" (76 mm)

t
12"(305 ram)

Ventilated Combustion Air
intake termination in crawl
space

CRAWL SPACE
Figure 56

_Attic Vent Termination
Ventilated Combustion
Air intake pipe

-7

t throuhgb.__._

roof flashing

ATTIC

440 01 4201 03

Specifications

subject

to change

L11F016

without

notice.

47

Figure 57

1Direct Vent Termination Clearance

AREAWHERE

[]

VEHTTERMINAL

\\\\\

(_

TERMINAL IS NOT PERMITED

AIRSUPPLYINLET

25-24-65-2

NOTE: The following is based upon National codes for gas appliances, and is provided as a reference.
Refer to Local codes which may supersede these standards and/or recommendations.
Item

ClearanceDescription

Canadian Installations {1)
(per CAN/CSA B149.1)

A

Clearance above grade, veranda, porch, deck, balconyor
anticipated snow level

12 in. (305 ram)
18 in. (457 ram)above roof surface.

B

Clearanceto a window or door that may be opened

12 in. (305 ram) for appliances >10,000Btuh (3 kW)
and 100,000 Btuh (30 kW)

C

Clearanceto a permanentlyclosed window
Vertical clearanceto a ventilatedsoffit located above the
terminal within a horizontal distance of 2 feet (61 cm) from
the centerlineof the terminal

D

U.S. Installations Iz)
(per ANSI Z223.1/NFPA54)
12 in. (305 ram)
9 in. (229 ram) for appliances>10,000 Btuh (3 kW)
and 50,000 Btuh (15kW)

For clearances not specifiedin ANSI Z223.1/NFPA54 or CAN/CSA B149.1,clearances shall be in accordance with local
installation codes and the requirementsof the gas supplier and the manufacturer'sinstallationinstructions.

E
F

Clearanceto an unventilated soffit
Clearance to an outside corner

G

Clearanceto an inside corner

H

Clearance to eachside of the centerlineextended above
electricalmeter or gas service regulator assembly

3 ft. (.9 M) within15 ft. (4.6 M)
above the meter/regulatorassembly,

3 ft. (.9 M) within 15 ft. (4.6 M)
above the meter/regulatorassembly.

I

Clearanceto service regulatorvent outlet

J

Clearanceto non mechanical air supply inlet to building or
the combustionair inlet to any other appliance

K

Clearance to a mechanical air supply inlet

3ft. (.9 M)
12in. (305 ram) for appliances>10,000 Btuh(3 kW)
and 100,000 Btuh (30 kW)
6 ft. (1.8 M)

See Note 4.
9 in. (9 ram) for appliances>10,000 Btuh (3 kW)
and 50,000 Btuh (15kW)
3ft. (.9 M)

Clearance under a veranda, porch, deck, or balcony

12 in. (305 ram).
Permittedonly if veranda, porch, deck, or balcony is fully open on a
minimum of two sides beneath the floor.

See Note 4.

L

Manufacturer'sRecommendation:See Notes 3-8.

12 in. (305 ram)

12 in. (305 ram)

3 ft. (.9 M)

3 ft. (.9 M)

Manufacturer'sRecommendation:See Notes 3-8.

N

Clearanceto each side of the centerlineextendedabove or
below vent terminal of the furnace to a dryer or water heater
vent, or other appliance'sdirect vent intake or exhaust
Inlet air clearance to a moisture exhaust duct
(dryervent, spa exhaust, etc.)

0

Clearance from a plumbing vent stack

3 ft. (.9 M)

3 ft. (.9 M)
See Note 4.

Clearance above paved sidewalk or paved drivewaylocated
on publicproperty

7 ft. (2.1 M).
Vent shall not terminate above a sidewalk or paved drivewaythat is
located betweentwo single family dwellingsand serves both
dwellings.

M

p

Manufacturer'sRecommendation:See Notes 3-8.

> greater than, > greater than or equal to, < less than, _ lessthan or equal to

Notes:
1.
2.
3.
4.
5.
6.
7.

8.

48

In accordancewith the currentCAN/CSA B149,1,NaturalGas and PropaneInstallationCode,
In accordancewith the currentANSI Z223,1/NFPA54, NationalFuel GasCode
NOTE: Thistable is based upon Nationalcodes forgas appliances,andare providedas a reference.
Refer to Loca/ codes which may supersedethese standardsand/orrecommendations.
For clearancesnotspecifiedin ANSIZ223,1/NFPA54 or CAN/CSAB 149,1,clearancesshallbe in accordancewithlocalinstallationcodesand the requirementsof the
gas supplierand the manufacturer'sinstallationinstructions,
When locatingvent terminations,considerationmust begivento prevailingwinds,location,andother conditionswhich may causerecirculationof the combustionproducts
of adjacentvents, Recirculationcan cause poor combustion,inlet condensateproblems, and acceleratedcorrosionof the heat exchangers.
Designand positionvent outletsto avoidice build-up on and moisturedamageto surroundingsurfaces,
The vent for this applianceshall not terminate:
a, Near soffit vents of crawlspace vents or other areaswhere condensateor vapor could createa nuisanceor hazardor properly damage;or
b, Where condensatevapor could causedamage or could be detrimentalto the operationof regulators,relief valves, or other equipment,
Avoidventingunder a deckor large overhang,Recirculationcouldoccur and causeperformanceor systemproblems.Ice build-upmay occur.
Specifications

subject

to change

without

notice.

440 O1 4201 03

Figure 58

_Other than Direct Vent Clearance - Ventilated Combustion Air Option

I
,i
H
-fl

D

VENT TERMINAL

\

Y_':_
tXi AIR SUPPLY INLET

E_

AREA WHERE TERMINAL IS NOT PERMITED

25-24-65-2

NOTE: The following is based upon National codes for gas appliances, and is provided as a reference.
Referto Local codes which may supersedethese standards and/or recommendations.
Item

ClearanceDescription

Canadian Installations(1}
(perCAN/CSAB149.1)

A

Clearance above grade, veranda, porch, deck. balcony or
anticipatedsnow level
"

12 in. (305 mm)
18 in. (457 ram)above roof surface.

12 in. (305 ram)

B

Clearance to a window or door that may be opened

12 in. (305 ram) for appliances >10,000Btuh (3 kW)
and 100,000 Btuh (30 kW)

4ft. (1.2M) belowor to the side of the opening,
1 ft (.3M) above the opening.
Manufacturer'sRecommendation:See Note 8.

C

Clearanceto a permanentlyclosed window
Vertical clearance to a ventilatedsoffit located above the
terminal within a horizontaldistance of 2 feet (61 cm) from
the centedineof the terminal

D
E

Clearance to an unventilatedsoffit

F
G

Clearance to an outside corner
Clearance to an inside corner

H

Clearance to each side of the centerline extendedabove
electrical meter or gasservice regulator assembly

U,S. Installations(z}
(per ANSI Z223.1/NFPA54)

For clearances not specified in ANSI Z223.1/NFPA54 or CAN/CSAB149.1, clearancesshall be in accordancewith local
installation codes and the requirementsof the gas supplier and the manufacturer'sinstallation instructions.
Manufacturer'sRecommendation:See Notes 3-8.

3 ft. (.9 M) within15 ft. (4.6 M)
above the meter/regulatorassembly,

3 ft. (.9 M) within15 ft. (4.6 M)
above the meter/regulatorassembly.

I

Clearance to service regulatorvent outlet

3ft. (.9 M)

See Note 4.

J

Clearanceto non mechanical air supply inlet to buildingor
the combustionair inlet to any other appliance

12in. (305 ram) for appliances>10,000 Btuh(3 kW)
and 100,000 Btuh (30 kW)

4ft. (1.2M) belowor to the side of the opening,
1 ft (.3M) above the opening.
Manufacturer'sRecommendation:See Note8

K

Clearance to a mechanicalair supply inlet

6 ft. (1.8 M)

3ft. (.9 M)
See Note 4.

L

Clearance under a veranda, porch, deck, or balcony

12 in. (305 ram).
Permittedonly if veranda, porch, deck, or balcony is fully open
on a minimum of two sides beneaththe floor.

Manufacturer'sRecommendation:See Notes3-8.

M

Clearance to each side of the centerline extendedabove or
belowvent terminal of the furnace to a dryer or waterheater
vent, or other appliance's directvent intake or exhaust

12 in. (305 ram)

12 in. (305 ram)

N

Inlet air clearanceto a moistureexhaust duct
(dryer vent, spa exhaust, etc.)

3 ft. (.9 M)

3 ft. (.9 M)

0

Clearance from a plumbing vent stack

3 ft. (.9 M)
7 ft. (2.1 M).

3 ft. (.9 M)

P

Clearance above paved
sidewalkor paved drivewaylocated
on publicproperty

Ventisshall
not betweentwo
terminateabove
a sidewalk
or paved driveway
that
located
single-family
dwellingsand
serves
both dwellings.

7ft. (2.1M)

> greaterthan, > greater than or equalto, < lessthan, < less than or equalto

Notes:
1,
2,
3.

In accordancewiththe current CAN/CSAB149,1,NaturalGas and PropaneInstallationCode,
In accordancewiththe current ANSIZ223,1/NFPA54, NationalFuelGas Code
NOTE: Thistable is based upon Nationalcodes for gas appliances,and areprovidedas a reference.
Refer to Loca/ codes whichmay supersede these standardsand/orrecommendations.

4.

Forclearancesnot specifiedinANSI Z223,1/NFPA54 or CAN/CSA B 149,1,clearancesshallbe in accordancewith localinstallationcodesandthe requirementsof the
gas supplierandthe manufacturer'sinstallationinstructions,

5.

When locatingvent terminations,considerationmust be givento prevailingwinds,location,and otherconditionswhichmay causerecirculationofthe combustionproducts
of adjacentvents, Recirculationcan cause poor combustion,inlet condensationproblems,and/oracceleratedcorrosionof the heatexchangers.
Designand positionvent outletsto avoid ice build-upon and moisturedamageto surroundingsurfaces,
The vent for this applianceshallnot terminate:

6.
7.

a, Near soffit vents of crawl spacevents or other areas where condensateor vaporcould create a nuisanceor hazardor propertydamage; or
8.

b, Where condensatevapor couldcause damage or couldbe detrimentalto the operation of regulators,reliefvalves, or other equipment,
These Nationalstandardsapply to all non-direct-ventgas appliances.Contact Localcode officialsfor additionalrequirementsand!orexclusions.

440 O1 4201 03

Specifications

subject

to change

without

notice.

49

Table 14

MAXIMUM

EQUIVALENT VENT LENTH - Feet (Meters)

Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations
Use Table 15 - DEDUCTIONS FROM MEVL to determine allowable vent length for each application.
DIRECT VENT (2-PIPE) AND VENTILATED COMBUSTION
Unit Size
Vent Pipe Diameter (in.)
BTU/Hr
1-1/2
2
2-1/2
3

Altitude
FT (M)

60,000
0 to 2000
(0 to 610)

55
35

80,000
100,000
120,000
60,000

2001 to 3000

80,000

(610 to 914)

100,000
120,000

(16.8)
(10.7)

45
30

(13.7)
(9.1)

AIR
4

135
130

(41.1)
(39.6)

235
175

(71.6)
(53.3)

265
235

(80.8)
(71.6)

265

(80.8)

50

(15.2)

110
15

(33.5)
(4.6)

235
100

(71.6)
(30.5)

265
250

(80.8)
(76.2)

127
90

(38.7)
(27.4)

222
165

(67.7)
(50.3)

250
222

(76.2)
(67.7)

249

(75.9)

40

(12.2)

104

(31.7)

223

(68.0)

250

(76.2)

11

(3.4)

93

(28.3)

237

(72.2)

60,000

40

(12.2)

119

(36.3)

210

(84.0)

235

(71.6)

3001 to 4000

80,000

25

(7.6)

(914 to 1219)

100,000
120,000

85
40

(25.9)
(12.2)

155
98

(47.2)
(29.9)

210
211

(64.0)
(84.3)

232
236

(70.7)
(71.9)

8

(2.4)

86

(26.2)

224

(68.3)

60,000

35

(10.7)

115

(35.1)

204

(62.2)

228

(69.5)

4001 to 4500

80,000

23

(7.0)

(1219 to 1370)

100,000
120,000

85
40

(25.9)
(12.2)

150
94

(45.7)
(28.7)

202
205

(61.6)
(62.5)

224
229

(68.3)
(69.8)

83

(25.3)

217

(66.1)

See notes at end of Venting
See Table 16 for altitudes

Tables.
over 4500 ft (1370m).

Table 15

DEDUCTIONS
Pipe Diameter

FROM MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters)

(in):

1-1/2

2

2-1/2

3

4

Mitered 90 -oElbow

8

(2.4)

8

(2.4)

8

(2.4)

8

(2.4)

8

(2.4)

Radius 90-0Elbow

5

(1.5)

5

(1.5)

5

(1.5)

5

(1.5)

5

(1.5)

Long Radius 90-° Elbow

3

(0.9)

3

(0.9)

3

(0.9)

3

(0.9)

3

(0.9)

Mitered 45-0Elbow

4

(1.2)

4

(1.2)

4

(1.2)

4

(1.2)

4

(1.2)

Radius 45-0Elbow

2.5

(0.8)

2.5

(0.8)

2.5

(0.8)

2.5

(0.8)

2.5

(0.8)

Long Radius 45-0Elbow

1.5

(0.5)

1.5

(0.5)

1.5

(0.5)

1.5

(0.5)

1.5

(0.5)

Tee

16

(4.9)

16

(4.9)

16

(4.9)

16

(4.9)

16

(4.9)

0

(0.0)

0

(0.0)

0

(0.0)

0

(0.0)

0

(0.0)

Medium

Medium

Concentric

Vent Termination

Standard Vent Termination
Note: 3- and 4-inch vent pipe systems

Figure 59

0

(0.0)

0

(0.0)

require long radius elbows.

Figure 60

1Elbows Configurations

Vent Terminal Configurations

©
MEDIUM

LONG

MITERED
L11F082
L11 F083
L11 F084

Venting

System

Length

Calculations

The Total Equivalent
Vent Length for EACH combustion
air or vent pipe equals the length of the venting
length of elbows used in the venting system from Table 15.
Standard
vent terminations
or factory accessory
concentric
vent terminations
count for zero deduction.
See vent system
manufacturer's
data for equivalent
lengths of flexible vent pipe or other
that one foot of flexible vent pipe equals one foot of straight PVC/ABS
DWV vent pipe.
Compare

50

the Total

Equivalent

Vent

Length

to the Maximum

Specifications

Equivalent

subject

to change

Vent Lengths

without

notice.

termination

in Table

system,

systems.

14 and Table

plus the equivalent

DO NOT ASSUME

16.

440 01 4201 03

Example

1

A direct-vent 60,000 BTUH furnace installed at 2100 ft. (640M). Venting system includes FOR EACH PIPE 100 feet (30 M) of vent
pipe, 95 feet (28 M) of combustion air inlet pipe, (3) 90 °- long-radius elbows, (2) 450- long-radius elbows, and a factory accessory
concentric vent kit.
Can this application use 2-in. (50 mm ND) PVC/ABS DWV vent piping?
100 ft.

Measure the required linear length of air inlet
and vent pipe; insert the longest of the two here
Add equiv length of (3) 900- long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)

(30 M)
3

3ff

x

(0.9 M)

Add equiv length of (2) 450- long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)

2

1.5ft

x

(0.5 M)

9ft.
(2.7 M)

From Table 15

3ft.
(0.9 M)

From Table 15

Add equiv length of factory concentric vent term

Oft.

Add correction for flexible vent pipe, if any

Oft.

127 ft.

Maximum Equivalent Vent Length (MEVL)

(38.7 M)
YES

Is TEVL less than MEVL?

Example

From Table 15
From Vent Manufacturer's
instructions; zero for PVC/ABS DWV

112 ft.
(34 M)

Total Equivalent Vent Length (TEVL)

Use length of the longer of the vent
or air inlet piping system

Add all of the above lines

For 2" pipe from Table 14
Therefore, 2" pipe MAY be used

2

A direct-vent 60,000 BTUH furnace installed at 2100 ft. (640M). Venting system includes FOR EACH PIPE 100 feet (30 M) of vent
pipe, 95 feet (28 M) of combustion air inlet pipe, (3) 900-long-radius elbows, and a polypropylene concentric vent kit. Also includes 20
feet (6.1 M) of flexible polypropylene vent pipe, included within the 100 feet (30 M) of vent pipe.
Assume that one meter of flexible 60mm or 80mm polypropylene
MANUFACTURER'S INSTRUCTIONS.
Can this application use 60mm (o.d.) polypropylene
Measure the required linear length of air inlet and
vent pipe; insert the longest of the two here
Add equiv length of (3) 900-long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of (2) 450-long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)

pipe equals 1.8 meters of PVC/ABS pipe. VERIFY FROM VENT

vent piping? If not, what size piping can be used?

3ft
(0.9 M)

3

x

0

x

Add equiv length of factory concentric vent term

9 M

x

3.3 ft/M

Add correction for flexible vent pipe, if any

1.8

x

20ft
(6.1 M)

Use length of the longer of the vent
or air inlet piping system

9ft.
(2.7 M)

From Vent Manufacturer's

instructions

Oft.
(0 M)

From Vent Manufacturer's

instructions

From Vent Manufacturer's

instructions

From Vent Manufacturer's

instructions

30 ft.

(9 M)
36 ft.
(11 M)
175 ft.
(53 M)

Total Equivalent Vent Length (TEVL)

127 ft.
(38.7 M)

Maximum Equivalent Vent Length (MEVL)
Is TEVL less than MEVL?

250 ft.
(76.2

Is TEVL less than MEVL?

YES

Specifications

subject

to change

without

notice.

Add all of the above lines

For 2" pipe from Table 14
Therefore, 60ram pipe may NOT be
used; try 80ram

NO

Maximum Equivalent Vent Length (MEVL)

440 01 4201 03

100 ft.
(30 M)

M)

For 3" pipe from Table 14
Therefore, 80ram pipe MAY be used

51

Table16

Altitude
FT (M)

4501 to 5000
(1370 to 1524)

MAXIMUM

EQUIVALENT VENT LENTH - Feet (Meters)

Note: Maximum Equivalent Vent Length (MEVL) does NOT include elbows or terminations.
Use DEDUCTIONS FROM MEVL - Table 15 to determine allowable vent length for each application.
Note: Vent sizing for Canadian installations over 4500 ft. (1370 M) above sea level are subject to acceptance
by the local authorities having jurisdiction.
DIRECT VENT (2-PIPE) AND VENTILATED COMBUSTION AIR
Unit Size
Vent Pipe Diameter
3
1-1/2
2
2-1/2
60,000
80,000

35
23

(10.7)
(7.0)

100,000
120,000

111
85

(33.8)
(25.9)

198
146

(60.4)
(44.5)

221
195

(67.4)
(59.4)

216

(65.8)

40

(12.2)

9t

(27.7)

2OO
8O

(61.0)
(24.4)

222
211

(67.7)
(64.3)

60,000

37

(11.3)

103

(31.4)

186

(56.7)

80,000

22

(6.7)

76

(23.2)

137

(41.8)

2O7
183

(83.1)

5001 to 6000

(55.8)

200

(61.0)

(1524 to 1829)

100,000
120,000

33

(10.1 )

85

(25.9)

188
74

(57.3)
(22.6)

208
199

(63.4)
(60.7)

60,000

35

(10.7)

96

(29.3)

174

(53.0)

194

(59.1)

6001 to 7000

80,000

20

(6.1)

71

(21.6)

120

(36.6)

(52.1)

185

(56.4)

(1829 to 2134)

100,000
120,000

31

(9.4)

79

(24.1)

171
178

(54.3)
(20.7)

195
187

(59.4)
(57.0)

(55.2)
(48.5)

170

(51.8)

62

(50.9)
(18.9)

182
175

(55.5)
(53.3)

7001 to 8000
(2134 to 2438)

8001 to 9000
(2438 to 2743)

9001 to 10,000
(2743 to 3048)

60,000
80,000

68
32
18

(9.8)
(5.5)

100,000
120,000
60,000
80,000

30
17

(9.1)
(5.2)

100,000
120,000

89
66

(27.1)
(20.1)

163
120

(49.7)
(36.6)

29

(8.8)

73

(22.3)

181
159
167

82
62

(25.0)
(18.9)

152
111

(46.3)
(33.8)

168
148

(51.2)
(45.1)

156

(47.5)

27

(8.2)

67

(20.4)

157
56

(47.9)
(17.1 )

170
164

(51.8)
(50.0)

156
137

(47.5)
142
157
153

(43.3)
(47.9)
(46.6)

60,000

27

(8.2)

76

(23.2)

142

(43.3)

80,000
100,000
120,000

15

(4.6)

57
24

(17.4)
(7.3)

103
62

(31.4)
(18.9)

147
51

(41.8)
(44.8)
(15.5)

NOTES:
1. Use only the vent pipe sizes shown for each furnace. It is NOT necessary to choose the smallest diameter pipe possible for
venting.
2. NA = Not allowed. Pressure switch will not close, or flame disturbance may result.
3. Vent sizing for Canadian installations over 4500 ft. (1370 m) above sea level are subject to acceptance by local authorities
having jurisdiction.
4. Size both the combustion air and vent pipe independently, then use the larger size for both pipes.
5. Assume two 45 ° degree elbows equal one 90 ° degree elbow. Wide radius elbows are desirable and may be required in some
cases.
6. Elbow and pipe sections within the furnace casing and at the vent termination should not be included in vent length or elbow
count.
7. The minimum pipe length is 5 (1.5) linear feet (meters) for all applications.
8. Use 3-in (76 mm) diameter vent termination kit for installations requiring a 4-in (102 mm) diameter pipe.

52

Specifications

subject

to change

without

notice.

440 01 4201 03

Maximum Allowable Exposed Vent Lengths in Unconditioned Space
Maximum Length of Uninsulated and Insulated Vent Pipe-Ft (M)

Table17

No Insulation
(F/G)9MAC
Max, Heat
Input

Winter
Design
Temp °F (°C)

Pipe Length
in Ft. & M
Ft,

20 (-10)
0 (-2O)
60,000

M
Ft.
M
Ft.

Pipe Diameter-inches (mm)
1.5
2.0
2.5
3.0
4.0

3/8-in. (9.5 mm)

1/2-in. (12.7 mm)

Pipe Diameter-inches (mm)
1.5
2.0
2.5
3.0
4.0

Pipe Diameter-inches (mm)
1.5
2.0
2.5
3.0
4.0

(38)
34.0
10.4

(51)
29.0
8.8

(64)
28.0
8.5

(76)
23.0
7.0

(102)
N/A
N/A

(38)
55.0
16.8

(51)
88.0
26.8

(64)
79.0
24.1

(76)
69.0
21.0

(102)
N/A
N/A

(38)
55.0
16.8

(51)
104.0
31.7

(64)
93.0
28.3

(76)
81.0
24.7

(102)
N/A
N/A

14.0
4.3

9.0
2.7

7.0
2.1

0.0
0.0

N/A
N/A

55.0
16.8

49.0
14.9

43.0
13.1

34.0
10.4

N/A
N/A

55.0
16.8

60.0
18.3

52.0
15.8

42.0
12.8

N/A
N/A

5.0

0.0

0.0

0.0

N/A

41.0

32.0

26.0

18.0

N/A

50.0

40.0

33.0

24.0

N/A

M
Ft.

1.5
0.0

0.0
0.0

0.0
0.0

0.0
0.0

N/A
N/A

12.5
30.0

9.8
21.0

7.9
16.0

5.5
8.0

N/A
N/A

15.2
37.0

12.2
28.0

10.1
22.0

7.3
13.0

N/A
N/A

-40 (-4O)

M

0.0

0.0

0.0

0.0

N/A

9.1

6.4

4.9

2.4

N/A

11.3

8.5

6.7

4.0

N/A

20 (-10)

Ft.
M

34.0
10.4

29.0
8.8

28.0
8.5

23.0
7.0

N/A
N/A

55.0
16.8

88.0
26.8

79.0
24.1

69.0
21.0

N/A
N/A

55.0
16.8

104.0
31.7

93.0
28.3

81.0
24.7

N/A
N/A

0 (-20)

Ft.
M

14.0
4.3

9.0
2.7

7.0
2.1

0.0
0.0

N/A
N/A

55.0
16.8

49.0
14.9

43.0
13.1

34.0
10.4

N/A
N/A

55.0
16.8

60.0
18.3

52.0
15.8

42.0
12.8

N/A
N/A

-20 (-30)

Ft.
M

5.0
1.5

0.0
0.0

0.0
0.0

0.0
0.0

N/A
N/A

41.0
12.5

32.0
9.8

26.0
7.9

18.0
5.5

N/A
N/A

50.0
15.2

40.0
12.2

33.0
10.1

24.0
7.3

N/A
N/A

-40 (-40)

Ft.
M

0.0
0.0

0.0
0.0

0.0
0.0

0.0
0.0

N/A
N/A

30.0
9.1

21.0
6.4

16.0
4.9

8.0
2.4

N/A
N/A

37.0
11.3

28.0
8.5

22.0
6.7

13.0
4.0

N/A
N/A

20 (-10)

Ft.
M

35.0
10.7

39.0
11.9

39.0
11.9

33.0
10.1

25.0
7.6

35.0
10.7

118.0
36.0

107.0
32.6

92.0
28.0

76.0
23.2

35.0
10.7

130.0
39.6

125.0
38.1

109.0
33.2

90.0
27.4

0 (-20)

Ft.
M

22.0
6.7

16.0
4.9

14.0
4.3

7.0
2.1

0.0
0.0

35.0
10.7

69.0
21.0

60.0
18.3

49.0
14.9

35.0
10.7

35.0
10.7

83.0
25.3

72.0
21.9

60.0
18.3

45.0
13.7
23.0

-20 (-3O)

60,600

80,000

Ft.

11.0

5.0

2.0

0.0

0.0

35.0

46.0

39.0

29.0

16.0

35.0

57.0

48.0

37.0

-20 (-30)

M

3.4

1.5

0.6

0.0

0.0

10.7

14.0

11.9

8.8

4.9

10.7

17.4

14.6

11.3

7.0

-40 (-40)

Ft.
M

4.0
1.2

0.0
0.0

0.0
0.0

0.0
0.0

0.0
0.0

35.0
10.7

33.0
10.1

26.0
7.9

17.0
5.2

4.0
1.2

35.0
10.7

41.0
12.5

34.0
10.4

24.0
7.3

11.0
3.4

20(-10)

Ft.
M

N/A
N/A

47.0
14.3

47.0
14.3

41.0
12.5

32.0
9.8

N/A
N/A

50.0
15.2

110.0
33.5

112.0
34.1

93.0
28.3

N/A
N/A

50.0
15.2

110.0
33.5

132.0
40.2

110.0
33.5

0 (-20)

Ft.
M

N/A
N/A

21.0
6.4

19.0
5.8

12.0
3.7

1.0
0.3

N/A
N/A

50.0
15.2

74.0
22.6

61.0
18.6

45.0
13.7

N/A
N/A

50.0
15.2

89.0
27.1

74.0
22.6

57.0
17.4

-20 (-30)

Ft.
M

N/A
N/A

8.0
2.4

6.0
1.8

0.0
0.0

0.0
0.0

N/A
N/A

50.0
15.2

49.0
14.9

38.0
11.6

23.0
7.0

N/A
N/A

50.0
15.2

60.0
18.3

48.0
14.6

32.0
9.8

-40 (-40)

Ft.
M

N/A
N/A

1.0
0.3

0.0
0.0

0.0
0.0

0.0
0.0

N/A
N/A

42.0
12.8

34.0
10.4

24.0
7.3

10.0
3.0

N/A
N/A

50.0
15.2

43.0
13.1

32.0
9.8

18.0
5.5

20 (-10)

Ft.
M

N/A
N/A

N/A
N/A

15.0
4.6

49.0
14.9

40.0
12.2

N/A
N/A

N/A
N/A

15.0
4.6

100.0
30.5

111.0
33.8

N/A
N/A

N/A
N/A

15.0
4.6

100.0
30.5

131.0
39.9

0 (-20)

Ft.
M

N/A
N/A

N/A
N/A

15.0
4.6

17.0
5.2

6.0
1.8

N/A
N/A

N/A
N/A

15.0
4.6

75.0
22.9

57.0
17.4

N/A
N/A

N/A
N/A

15.0
4.6

90.0
27.4

70.0
21.3

-20 (-30)

Ft.
M

N/A
N/A

N/A
N/A

10.0
3.0

2.0
0.6

0.0
0.0

N/A
N/A

N/A
N/A

15.0
4.6

48.0
14.6

32.0
9.8

N/A
N/A

N/A
N/A

15.0
4.6

59.0
18.0

42.0
12.8

-40 (-40)

Ft.
M

N/A
N/A

N/A
N/A

1.0
0.3

0.0
0.0

0.0
0.0

N/A
N/A

N/A
N/A

15.0
4.6

32.0
9.8

17.0
5.2

N/A
N/A

N/A
N/A

15.0
4.6

41.0
12.5

25.0
7.6

100,000

120,000

International Comfort Product, LLC • PO Box 128 •
Lewisburg, TN 37091 USA

440 01 4201 03

Specifications

subject

to change

without

notice.

53



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