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.
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.
CAUTION − Hazards or unsafe practices which
may result in minor personal injury or product or
property damage.
NOTE − Used to highlight suggestions which will
result in enhanced installation, reliability, or
operation.
Signal Words in Manuals
The signal word WARNING is used throughout
this manual in the following manner:
!
WARNING
The signal word CAUTION is used throughout
this manual in the following manner:
!
CAUTION
Signal Words on Product Labeling
Signal words are used in combination with
colors and/or pictures or product labels.
Safety−alert symbol
When you see this symbol on the unit and in
instructions or manuals, be alert to the
potential for personal injury.
FOR INSTALLATIONS IN CANADA33........................
DIRECT VENT / 2−PIPE SYSTEM35..........................
VENTILATED COMBUSTION AIR SYSTEMS35................
TERMINATION REQUIREMENTS FOR
THE PROVINCES OF ALBERTA AND SASKATCHEWAN37.....
MAXIMUM EQUIVALENT VENT LENGTH51...................
MAXIMUM ALLOWABLE EXPOSED VENT LENGTHS54........
Portions of the text and tables are reprinted from NFPA 54 /ANSI Z223.1−2012, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washington, DC
20001. This reprinted material is not the complete and official position of the NFPA or ANSI, on the referenced subject, which is represented only by the standard in its entirety.
INSTALLER: Affix these instructions on or adjacent to the
furnace.
CONSUMER: Retain these instructions for future
reference.
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 .
Printed in U.S.A.440 01 4300 02 12/5/2013
Page 2
Required Notice for Massachusetts Installations
Important
The Commonwealth of Massachusetts requires compliance with regulation 248 CMR as follows:
5.08: Modifications to NFPA−54, Chapter 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:
1.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.
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.
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.
(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a) 1 through 4:
1.The equipment listed in Chapter 10 entitled “Equipment Not Required To Be Vented” in the most current edition of NFPA 54 as adopted by the
Board; and
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.
(c) 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; and
2.A complete parts list for the venting system design or venting system.
(d) 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; and
2.The “special venting systems” shall be Product Approved by the Board, and the instructions for that system shall include a parts list and detailed
installation instructions.
(e) 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 of Massachusetts Board of State Examiners of Plumbers and Gas
Fitters, 239 Causeway Street, Boston, MA 02114. 617−727−9952
2
Specifications are subject to change without notice.
440 01 4300 02
Page 3
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Safety Considerations
!WARNING
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.
!WARNING
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.
!CAUTION
FURNACE RELIABILITY HAZARD
Failure to follow this caution may result in unit
component damage.
Application of this furnace should be indoors with
special attention given to vent sizing and material, gas
input rate, air temperature rise, unit leveling, and unit
sizing.
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.
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.
Follow all safety codes. Wear safety glasses, protective
clothing, and work gloves. Have a fire extinguisher available.
Read these instructions thoroughly and follow all warnings or
cautions included in literature and attached to the unit.
!CAUTION
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts, and servicing
furnaces.
This is the safety−alert symbol . 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 andNOTICE are used to highlight suggestions which will result in
enhanced installation, reliability, or operation.
1.Use only with type of gas approved for this furnace.
Refer to the furnace rating plate.
2.Install this furnace only in a location and position as
specified in the “Location” section of these instructions.
3.Provide adequate combustion and ventilation air to the
furnace space as specified in “Air for Combustion and
Ventilation” section.
4.Combustion products must be discharged outdoors.
Connect this furnace to an approved vent system only,
as specified in the “Venting” section of these
instructions.
5.Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections, as
specified in the “Gas Piping” section.
6.Always install furnace to operate within the furnace’s
intended temperature−rise range with a duct system
which has an external static pressure within the
allowable range, as specified in the “Start−Up,
Adjustments, and Safety Check” section. See furnace
rating plate.
7.When a furnace is installed so that supply ducts carry air
circulated by the furnace to areas outside the space
containing the furnace, the return air shall also be
handled by duct(s) sealed to the furnace casing and
terminating outside the space containing the furnace.
See “Air Ducts” section.
8.A gas−fired furnace for installation in a residential
garage must be installed as specified in the warning box
in the “Location” section. (See Figure 4)
9.The furnace may be used for construction heat provided
that the furnace installation and operation complies with
the first CAUTION in the LOCATION section on page 7
of these instructions.
10.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
440 01 4300 023
Specifications subject to change without notice.
Page 4
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
accessory gas conversion kit is required to convert
furnace for use with propane gas.
11.See Table 1 for required clearances to combustible
construction.
12.Maintain a 1−in. (25 mm) clearance from combustible
materials to supply air ductwork for a distance of 36−in.
(914 mm) horizontally from the furnace. See NFPA 90B
or local code for further requirements.
Table 1
POSITION
REAR0
FRONT (Combustion air openings in fur-
nace and in structure)
Required for service*24 (610)
All Sides of Supply Plenum*1 (25)
Sides0
Vent0
Top of Furnace1 (25)
* Consult your local building codes.
13.These furnaces SHALL NOT be installed directly on
carpeting, combustible tile, or any other combustible
material other than wood flooring. In downflow
installations, factory accessory floor base MUST be
used when installed on combustible materials and wood
flooring. Special base is not required when this furnace
is installed on manufacturer’s Coil Assembly is used.
See Table 1 for clearance to combustible construction
information.
Minimum Clearances to
Combustible Materials for All Units
CLEARANCE
In(mm)
1 (25)
NOTICE
IMPORTANT INSTALLATION AND START−UP
PROCEDURES
Failure to follow this procedure may result in a nuisance smoke
or odor complaint.
The manifold pressure, gas rate by meter clocking, temperature
rise and operation must be checked after installation. Minor
smoke and odor may be present temporarily after start−up from
the manufacturing process. Some occupants are more
sensitive to this minor smoke and odor. It is recommended that
doors and windows be open during the first heat cycle.
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 Figure 3) 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, parts assemblies and
literature before operating the furnace.
Figure 1
32° F/0° C MINIMUM INSTALLED
AMBIENT OR FREEZE
PROTECTION REQUIRED
Freeze Protection and Return Air
Temperature
SUPPLY AIR
MAX 80°F/27°C
MIN 60°F/16°C
A10490
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
54−2012/ANSI Z223.1−2012 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 DC 20001.
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 Lining and Fibrous Glass
Duct
US and CANADA: current edition of SMACNA, NFPA
90B as tested by UL Standard 181 for Class I Rigid Air
Ducts
Gas Piping and Gas Pipe Pressure
Testing
U.S.A.: NFPA 54/ANSI Z223.1−2012, NFGC; Chapters
5, 6, 7, and 8 and national plumbing codes.
CANADA: CAN/CSA−B149.1−2010, Parts 4, 5, 6 and
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.
Electrical Connections
U.S.A.: National Electrical Code (NEC) ANSI/NFPA
70−2011
CANADA: Canadian Electrical Code CSA C22.1
Condensate Drain Connection
US: National Standard Plumbing Code 2009, Section 8.7.
Canada: National Plumbing Code of Canada 2010 in
Failure to follow this caution may result in unit component damage.
Electrostatic discharge can affect electronic components. Take precautions during furnace installation and servicing to protect the furnace electronic control. Precautions will prevent electrostatic discharges from personnel and hand tools which are held during the
procedure. These precautions will help to avoid exposing the control
to electrostatic discharge by putting the furnace, the control, and the
person at the same electrostatic potential.
1.Disconnect all power to the furnace. Multiple
disconnects may be required. DO NOT TOUCH THE
CONTROL OR ANY WIRE CONNECTED TO THE
CONTROL PRIOR TO DISCHARGING YOUR BODY’S
ELECTROSTATIC CHARGE TO GROUND.
2.Firmly touch the clean, unpainted, metal surface of the
furnace chassis which is close to the control. Tools held
in a person’s hand during grounding will be satisfactorily
discharged.
3.After touching the chassis, you may proceed to service
the control or connecting wires as long as you do nothing
to recharge your body with static electricity (for example;
DO NOT move or shuffle your feet, do not touch
ungrounded objects, etc.).
4.If you touch ungrounded objects (and recharge your
body with static electricity), firmly touch a clean,
unpainted metal surface of the furnace again before
touching control or wires.
5.Use this procedure for installed and uninstalled
(ungrounded) furnaces.
6.Before removing a new control from its container,
discharge your body’s electrostatic charge to ground to
protect the control from damage. If the control is to be
installed in a furnace, follow items 1 through 4 before
bringing the control or yourself in contact with the
furnace. Put all used and new controls into containers
before touching ungrounded objects.
7.An ESD service kit (available from commercial sources)
may also be used to prevent ESD damage.
Accessories
See Specification Sheets for a list of accessories for this
product.
Improper use or installation of this furnace may result in premature
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 rollout and/or drawing combustion products into the structure.
−The furnace is controlled by a thermostat. It may not be “hot wired” to
provide heat continuously to the structure without thermostatic control.
−Clean outside air is provided for combustion. This is to minimize the
corrosive effects of adhesives, sealers and other construction materials.
It also prevents the entrainment of drywall dust into combustion air, which
can cause fouling and plugging of furnace components.
−The temperature of the return air to the furnace is maintained between
55°F (13°C) and 80°F (27°C), with no evening setback or shutdown. The
use of the furnace while the structure is under construction is deemed to
be intermittent operation per our installation instructions.
−The air temperature rise is within the rated rise range on the furnace
rating plate, and the gas input rate has been set to the nameplate value.
−The filters used to clean the circulating air during the construction
process must be either changed or thoroughly cleaned prior to
occupancy.
−The furnace, ductwork and filters are cleaned as necessary to remove
drywall dust and construction debris from all HVAC system components
after construction is completed.
−Verify proper furnace operating conditions including ignition, gas input
rate, air temperature rise, and venting according to these installation
instructions.
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:
be installed so the electrical components are protected
from water.
not be installed directly on any combustible material other
than wood flooring (refer to SAFETY
CONSIDERATIONS).
be located close to the chimney or vent and attached to an
air distribution system. Refer to Air Ducts section.
be provided ample space for servicing and cleaning.
Always comply with minimum fire protection clearances
shown in Table 1 or on the furnace clearance to
combustible construction label.
Failure to follow this warning could result in personal injury or death and
unit component damage.
Corrosive or contaminated air may cause failure of parts containing flue
gas, which could leak into the living space. Air for combustion must not
be contaminated by halogen compounds, which include fluoride, chloride, bromide, and iodide. These elements can corrode heat exchangers
and shorten furnace life. Air contaminants are found in aerosol sprays,
detergents, bleaches, cleaning solvents, salts, air fresheners, and other
household products. Do not install furnace in a corrosive or contaminated
atmosphere. Make sure all combustion and circulating air requirements
are met, in addition to all local codes and ordinances.
The following types of furnace installations may require
OUTDOOR AIR for combustion due to chemical exposures:
Commercial buildings
Buildings with indoor pools
Laundry rooms
Hobby or craft rooms, and
Chemical storage areas
If air is exposed to the following substances, it should not be
used for combustion air, and outdoor air may be required for
combustion:
Permanent wave solutions
Chlorinated waxes and cleaners
Chlorine based swimming pool chemicals
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.
440 01 4300 027
Specifications subject to change without notice.
Page 8
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 3Multipoise Orientations
THE BLOWER IS
LOCATED BELOW THE
BURNER SECTION, AND
CONDITIONED AIR IS
THE BLOWER IS LOCATED
TO THE RIGHT OF THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED TO THE LEFT.
DISCHARGED UPWARD.
THE BLOWER IS
LOCATED ABOVE THE
BURNER SECTION, AND
CONDITIONED AIR IS
DISCHARGED DOWNWARD.
!WARNING
FIRE, INJURY OR DEATH HAZARD
Failure to follow this warning could result in personal injury, death and/or
property damage.
When the furnace is installed in a residential garage, the burners and ignition sources must be located at least 18−in. (457 mm) above the floor.
The furnace must be located or protected to avoid damage by vehicles.
When the furnace is installed in a public garage, airplane hangar, or other
building having a hazardous atmosphere, the furnace must be installed
in accordance with the NFPA 54/ANSI Z223.1−2012 or CAN/CSA
B149.1−2010. (See Figure 4)
Figure 4Installation in a Garage
THE BLOWER IS
LOCATED TO THE LEFT
OF THE BURNER SECTION,
AND CONDITIONED AIR IS
DISCHARGED TO THE RIGHT.
Figure 5Prohibited Installations
BACK POSITIONED
DOWNWARD
BACK POSITIONED
UPWARD
L12F010
AIR
RETURN
CUT IN
BACK
L12F011
!WARNING
FIRE HAZARD
Failure to follow this warning could result in personal injury, death and/or
property damage.
Do not install the furnace on its back or hang furnace with control compartment facing downward. Safety control operation will be adversely affected. Never connect return−air ducts to the back of the furnace. (See
Figure 5)
8440 01 4300 02
Location Relative to Cooling
Equipment
The cooling coil must be installed parallel with, or on the
downstream side of the unit to avoid condensation in the heat
A93044
Specifications subject to change without notice.
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.
Page 9
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Air for Combustion and
Ventilation
Introduction
Direct Vent (2−Pipe) 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.
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
Z223.1−2012 , 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.
!CAUTION
FURNACE CORROSION HAZARD
Failure to follow this caution may result in furnace damage.
Air for combustion must not be contaminated by halogen compounds,
which include fluoride, chloride, bromide, and iodide. These elements
can corrode heat exchangers and shorten furnace life. Air contaminants
are found in aerosol sprays, detergents, bleaches, cleaning solvents,
salts, air fresheners, and other household products.
!WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal injury or death.
The operation of exhaust fans, kitchen ventilation fans, clothes dryers,
attic exhaust fans or fireplaces could create a NEGATIVE PRESSURE
CONDITION at the furnace. Make−up air MUST be provided for the
ventilation devices, in addition to that required by the furnace. Refer to
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.
Figure 6
*Minimum dimensions of 3‐in. (76mm)
NOTE: Use any of the following combinations of openings:
A & B, C & D, D & E, F & G
Air for Combustion, Ventilation,
and Dilution for Outdoors
L12F012
Outdoor Combustion Air Method
1.Provide the space with sufficient air for proper
combustion, ventilation, and dilution of flue gases using
permanent horizontal or vertical duct(s) or opening(s)
directly communicating with the outdoors or spaces that
freely communicate with the outdoors.
2.Figure 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
2
mm
/kW) of combined input for all gas appliances in
the space per Figure 6 and Table 3.
d. TWO OPENINGS OR VERTICAL DUCTS require 1
square inch (25.4 square mm)of free area per 4,000
Btuh (550 mm
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 mm
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.
2
/kW) for combined input of all gas
2
/kW) for combined input of all gas
440 01 4300 029
Specifications subject to change without notice.
Page 10
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Table 3Minimum Free Area Required for Each Combustion Air Opening or Duct to Outdoors
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 4Minimum Space Volumes for 100% Combustion, Ventilation and Dilution Air from Outdoors
OTHER THAN FAN‐ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
ACH
0.60
0.50
0.40
0.30
0.20
0.10
0.00
NP = Not Permitted
304050406080100120140
1,050
(29.7)
1,260
(35.6)
1,575
(44.5)
2,100
(59.4)
3,150
(89.1)
6,300
(178.0)
1,400
(39.6)
1,680
(47.5)
2,100
(59.4)
2,800
(79.2)
4,200
(118.9)
8,400
(237.8)
1,750
(49.5)
2,100
(59.4)
2,625
(74.3)
3,500
(99.1)
5,250
(148.6)
10,500
(297.3)
1,400
(39.6)
1,680
(47.5)
2,100
(59.4)
2,800
(79.2)
4,200
(118.9)
8,400
(237.8)
NPNPNPNPNPNPNPNPNP
CONDENSATE TRAP
!CAUTION
FROZEN AND BURST WATER PIPE HAZARD
Failure to protect against the risk of freezing may result in property
damage.
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 protected. The use of accessory drain
trap heaters, electric heat tape and/or RV antifreeze is recommended for
these installations.
Space Volume Ft
1,500
(42.5)
1,800
(51.0)
2,250
(63.7)
3,000
(84.9)
4,500
(127.3)
9,000
(254.6)
DO NOT trap the drain line in any other location than at the
condensate drain trap supplied with the furnace. If possible, DO
NOT route the drain line where it may freeze. The drain line
must terminate at an inside drain to prevent freezing of the
condensate and possible property damage.
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.
FAN‐ASSISTED TOTAL
(1,000'S BTUH GAS INPUT RATE)
3
3
(M
)
2,000
(56.6)
2,400
(67.9)
3,000
(84.9)
4,000
(113.2)
6,000
(169.8)
12,000
(339.5)
2,500
(70.8)
3,000
(84.9)
3,750
(106.1)
5,000
(141.5)
7,500
(212.2)
15,000
(424.4)
3,000
(84.9)
3,600
(101.9)
4,500
(127.3)
6,000
(169.8)
9,000
(254.6)
18,000
(509.2)
Condensate Trap − Upflow Orientation
!CAUTION
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.
When the furnace is installed in the upflow position, it is not
necessary to relocate the condensate trap or associated
tubing. See Figure 7 for upflow condensate trap information.
Refer to Condensate Drain section for information how to install
the condensate drain.
Dia.
3,500
(99.1)
4,200
(118.9)
5,250
(148.6)
7,000
(198.1)
10,500
(297.1)
21,000
(594.1)
10440 01 4300 02
Specifications subject to change without notice.
Page 11
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Condensate Trap − Downflow
Orientation
When the furnace is installed in the downflow position, the
condensate trap will be initially located at the upper left corner
of the collector box, as received from the factory. See the top
image in Figure 8. When the furnace is installed in the
downflow orientation, the condensate trap must be relocated
for proper condensate drainage. See bottom image in Figure 8.
Figure 7Upflow Trap Configuration
Condensate Trap
Relief Port
Collector Box
Plugs
To Relocate the Condensate Trap:
Orient the furnace in the downflow position.
Figure 8 shows the condensate trap and tubing before and
after relocation. Refer to Figure 8 to begin the trap conversion.
Refer to Condensate Drain section for information how to install
the condensate drain.
Vent Pipe Clamp
Vent Elbow Clamp
Vent Elbow
Collector Box
Plug
Condensate Trap
Relief Port
Pressure Switch
Port
Representative drawing only, some models may vary in appearance.
Condensate Trap
Figure 8Unconverted Factory Configuration as viewed in the Downflow Orientation
Remove pressure switch tube from
pressure switch port.
Remove relief tube from relief
port on condensate trap.
Remove trap from
collector box.
Remove tube from
relief port.
Outlet
A11306
Loosen clamp on inlet
to vent elbow.
Representative drawing only, some models may vary in appearance.
440 01 4300 0211
Remove middle and bottom plugs.
DO NOT DISCARD.
A11585A
Specifications subject to change without notice.
Page 12
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Downflow Trap Configuration
Trim excess tube.
7
Connect pressure switch
Install plugs on
open ports on
collector box.
Connect relief tube to
port on collector box.
Rotate elbow to
desired position and
9
tighten clamp to
15 lb.−in.
Slide tube in stand−offs
to adjust length.
Align condensate trap
over middle and bottom
ports of collector box.
tube to port on collector
box.
Attach condensate trap
with screw to collector
box.
Connect relief tube to
relief port on condensate
trap.
Representative drawing only, some models may vary in appearance.
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 10. 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 9. In both cases trap must be repositioned on the
collector box for proper condensate drainage. See bottom images
in Figure 9 and Figure 10.
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 16)
NOTICE
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.
A11585B
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 9 shows the condensate trap and tubing before and
after relocation in the horizontal right position.
Figure 10 shows the condensate trap and tubing before and
after relocation in the horizontal left position.
Refer to the appropriate figure to begin the trap conversion.
Refer to Condensate Drain section for information how to install
the condensate drain.
NOTICE
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. per foot (20mm per
meter) of slope down and away from the furnace in horizontal
sections of drain line.
12440 01 4300 02
Specifications subject to change without notice.
Page 13
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 9Unconverted Factory Configuration as viewed in the Horizontal Left Orientation
Remove trap from
If alternate vent position
is required, loosen clamp
on vent elbow inlet.
Remove relief tube
from port on collector
box.
Representative drawing only, some models may vary in appearance.
collector box.
Remove pressure switch tube
from port on collector box.
Remove middle and right
plug from collector box.
DO NOT DISCARD
Remove relief tube
from relief port on
condensate trap.
A11586A
Figure 9 − continued Horizontal Left Trap Configuration
Rotate elbow to
desired position and
torque clamp on inlet
15 lb.−in.
Slide relief tube in
stand−offs to adjust
length.
Attach condensate
trap to collector box
with screw.
Align trap over middle
and right−hand port on
collector box.
Representative drawing only, some models may vary in appearance.
Install plugs in open
ports on collector box.
Connect relief tube to
port on collector box.
Trim excess tube.
Route pressure switch tube
underneath relief tube and
connect to port on collector box.
Connect relief tube to
relief port on condensate
trap.
A11586B
440 01 4300 0213
Specifications subject to change without notice.
Page 14
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 10Unconverted Factory Configuration as viewed in the Horizontal Right Orientation
Remove plug from
collector box.
DO NOT DISCARD.
If alternate vent position
is required, loosen clamp
on inlet of vent elbow.
Remove trap from
collector box.
Representative drawing only, some models may vary in appearance.
Figure 10 − continued Horizontal Right Trap Configuration
Attach condensate trap
to collector box with
screw.
Install plug in open
port on collector box.
Representative drawing only, some models may vary in appearance.
Condensate Drain Connection
!CAUTION
Slide relief tube in
stand-offs to adjust
length.
Vent elbow shown in alternate
orientation. Tighten clamp on
inlet to vent elbow 15 lb.-in.
Align trap over middle and
right-hand port on collector box.
A11281
!CAUTION
FROZEN AND BURST WATER PIPE HAZARD
Failure to protect against the risk of freezing may result in property
damage.
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 protected. The use of accessory drain
trap heaters, electric heat tape and/or RV antifreeze is recommended for
these installations.
14440 01 4300 02
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.
DO NOT trap the drain line in any other location than at the
condensate drain trap supplied with the furnace. If possible, DO
NOT route the drain line where it may freeze. The drain line
Specifications subject to change without notice.
Page 15
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
must terminate at an inside drain to prevent freezing of the
condensate and possible property damage.
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
heat tape and secure with appropriate plastic ties. Follow the
heat tape manufacturer’s recommendations. Prime the trap
before furnace operation.
The condensate drain line must be supported and/or secured
per local codes. Supports and clamps should be spaced to
prevent the drain line from sagging or being dislocated from the
furnace or termination point. In the absence of local codes,
consult the edition of the National Standard Plumbing Code
2009, in the US or the National Plumbing Code of Canada
2010 in Canada.
Upflow/Downflow Orientation
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 11.
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 Right Side Condensate Drain:
1. Remove the 7/8−in. knock−out from the right side of the
casing. (See Figure 12 for suggested knockout removal
technique.)
2. Remove the pre−formed rubber drain tube and two
spring clamps from the loose parts bag.
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
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.
8. Open the spring clamp and insert the long end of the
adapter of the 1/2−in. CPVC pipe into the outlet stub on
the drain tube.
9. 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.
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 11Example of Field Drain Attachment
A13364
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 Connection:
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.
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
drain tube as shown in Figure 13.
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. SeeFigure 12. DO NOT DISCARD THE FORMED
GROMMET OR THE RUBBER ELBOW. Both of these
pieces will be used.
Assemble and route the drain line to the opposite side of the
furnace as detailed below:
5. Remove the knock−out from the left side of the casing.
(See Figure 12 for suggested knockout removal
technique.)
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 (downflow). (NOTE: When the inducer
housing has been removed to ease installation in upflow
applications, this step is not needed.)
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.
440 01 4300 0215
Specifications subject to change without notice.
Page 16
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
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.
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.
13. Secure the rubber elbow to the drain trap and the ”Z”
pipe with spring clamps.
14. Secure the grommet to the ”Z” pipe 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.
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.
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.
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.
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.
Avoid misalignment of the drain pipe which may cause
kinks in the elbow or grommet.
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.
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 12Knockout Removal
NOTICE
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.
TIPS FROM CONTRACTORS: When installing the furnace
horizontally, use the entire drain elbow (that is, do NOT cut as
shown in Figure 13) 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 misalignment of the
drain pipe which may cause kinks in the elbow.
Horizontal Orientation
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.
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.
3. Remove the knock−out for the condensate trap in the
side of the casing.
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.
16440 01 4300 02
!CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care
and wear appropriate protective clothing, safety glasses and
gloves when handling parts, and servicing furnaces.
Figure 13Modify Rubber Drain Elbow
Cut line for left side condensate drain.
Do not discard parts after cutting.
Specifications subject to change without notice.
1−3/8 in
(35 mm)
L12F019
L11F089
Page 17
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 14Drain Trap Connection and Routing
Attach elbow to condensate trap
Cut formed end off
Formed end of
grommet
Factory supplied 1/2−in. CPVC to
3/4−in. PVC adapter
TRAP, DRAIN ELBOW WITH DISCHARGE PIPE
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
condensate drain
elbow
Connect short end
of “Z” pipe to modified
drain elbow
Modified drain elbow connect to
condensate trap and “Z” pipe
Figure 16Horizontal Drain Trap Grommet
s
Remove knockout.
Install grommet before
relocating condensate
trap.
A11348
INSTALLATION
NOTICE
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.
LEFT SIDE DRAIN ROUTED BEHIND INDUCER
NOTE: Remove Inducer Housing for easier access, if desired.
L12F015
Figure 15Formed Rubber Drain Grommet
INSTALL CLAMPS ON DRAIN ELBOW
ATTACH DRAIN ELBOW TO CONDENSATE
DRAIN TRAP
PULL DRAIN STUB
THROUGH CASING
OPEN SPRING CLAMP
INSERT FACTORY−SUPPLIED 1/2−IN. CPVC
TO 3/4−IN. PVC ADAPTER OR 1/2−IN. CPVC PIPE
*CLAMP MAY BE LOCATED ON OUTSIDE OF DRAIN ELBOW
L12F022
UPFLOW INSTALLATION
NOTE: The furnace must be pitched as shown in Figure 17 for
proper condensate drainage.
Figure 17Furnace Pitch Requirements
LEVEL 0-IN. (0 MM) TO
1/2-IN. (13 MM) MAX
MIN 1/4-IN. (6 MM) TO
1/2-IN. (13 MM) MAX
UPFLOW OR
DOWNFLOW
HORIZONTAL
A11237
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 21) 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
440 01 4300 0217
Specifications subject to change without notice.
Page 18
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
supply−side accessories MUST be connected to duct external
to furnace main casing.
Return Air Connections
!WARNING
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 26, Figure 27 and
Figure 28)
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 18)
2.Remove bottom plate.
3.Remove bottom closure panel.
4.Reinstall bottom plate and screws.
Figure 18Removing Bottom Closure Panel
Figure 19Leveling Legs
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.)
3.Install another nut on other side of furnace base. (Install
flat washer if desired.)
4.Adjust outside nut to provide desired height, and tighten
inside nut to secure arrangement.
5.Reinstall bottom closure panel if removed.
DOWNFLOW INSTALLATION
NOTE: The furnace must be pitched as shown in Figure 17 for
proper condensate drainage.
BOTTOM
PLATE
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed
in bottom return−air opening. This panel MUST be in place
when only side return air is used.
NOTE: Side return−air openings can be used in UPFLOW and
most HORIZONTAL configurations. Do not use side return−air
openings in DOWNFLOW configuration. (See Figure 26,
Figure 27 and Figure 28)
Leveling Legs (If Desired)
In upflow position with side return inlet(s), leveling legs may be
used. (See Figure 19) Install field−supplied, 5/16 x 1−1/2 in. (8
x 38 mm) (max) corrosion−resistant machine bolts, washers
and nuts.
18440 01 4300 02
Supply Air Connections
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):
Special Base − NAHA01101SB
L11F004
Specifications subject to change without notice.
Cased Coil Assembly − EAM4X, END4X, ENW4X
1.Determine application being installed from Table 5.
2.Construct hole in floor per Table 5 and Figure 20.
3.Construct plenum to dimensions specified in Table 5
and Figure 20.
4.Install as shown in Figure 22. If Coil Assembly Part is
used, install as shown in Figure 23 .
Page 19
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 20
Floor and Plenum Opening
Dimensions
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 21)
!CAUTION
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts, and servicing
furnaces.
Connect supply−air duct to supply−air outlet on furnace. Bend
flange inward past 90 with wide duct pliers (See Table 1Figure 21) 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,
humidifier, or other accessories. All supply−side accessories
MUST be connected to duct external to furnace casing.
Return Air Connections
!WARNING
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 return−air opening
(bottom inlet) as shown in Figure 26. DO NOT cut into casing
sides (left or right). Bypass humidifier connections should be
made at ductwork or coil casing sides exterior to furnace. (See
Figure 26)
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel installed
in bottom return−air opening. Remove and discard this panel
when bottom return air is used in downflow applications. To
remove bottom closure panel, perform the following:
1.Tilt or raise furnace and remove four (4) screws holding
bottom plate panel. (See Figure 18)
2.Remove bottom plate.
3.Remove bottom closure panel.
4.Reinstall bottom plate and screws.
Figure 21Duct Flanges
PERFORATED
DISCHARGE DUCT
FLANGE
UPFLOWDOWNFLOWHORIZONTAL
90°
120°
MIN
YES
YES
NO
120°
MIN
YES
YES
NO
120°
MIN
90°
YES
YES
NO
A10493
440 01 4300 0219
Specifications subject to change without notice.
Page 20
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Table 5Opening Dimensions − in. (mm)
FURNACE
CASING WIDTH
IN. (mm)
17–1/2
(445)
21
(533)
24−1/2
(622)
APPLICATION
Upflow Applications on Combustible or Noncombustible Flooring
(subbase not required)
Downflow Applications on Noncombustible Flooring
(subbase not required)
Downflow applications on combustible flooring (subbase required)
Downflow Applications on Combustible Flooring with Coil Assembly or coil
box (subbase not required)
Upflow Applications on Combustible or Noncombustible Flooring
(subbase not required)
Downflow Applications on Noncombustible Flooring
(subbase not required)
Downflow applications on combustible flooring
(subbase required)
Downflow Applications on Combustible Flooring with Coil Assembly or coil
box (subbase not required)
Upflow Applications on Combustible or Noncombustible Flooring
(subbase not required)
Downflow Applications on Noncombustible Flooring
(subbase not required)
Downflow applications on Combustible flooring
(subbase required)
Downflow Applications on Combustible Flooring with Coil Assembly or
coil box (subbase not required)
PLENUM OPENINGFLOOR OPENING
ABCD
16
(406)
15−7/8
(403)
15−1/8
(384)
15−1/2
(394)
19−1/2
(495)
19−3/8
(492)
18−5/8
(473)
19
(483)
23
(584)
22−7/8
(581)
22−1/8
(562)
22−1/2
(572)
21−5/8
(549)
19
(483)
19
(483)
19
(483)
21−5/8
(549)
19
(483)
19
(483)
19
(483)
21−1/8
(537)
19
(483)
19
(483)
19
(483)
16−5/8
(422)
16−1/2
(419)
16−3/4
(425)
16−1/2
(419)
20−1/8
(511)
20
(508)
20−1/4
(514)
20
(508)
23−5/8
(600)
23−1/2
(597)
23−3/4
(603)
23−1/2
(597)
22−1/4
19−5/8
20−5/8
22−1/4
19−5/8
20−5/8
22−1/4
19−5/8
20−5/8
(565)
(498)
(600)
20
(508)
(565)
(498)
(600)
20
(508)
(565)
(498)
(600)
20
(508)
Figure 22
Furnace, Plenum, and Subbase
Installed on a Combustible Floor
A96285
HORIZONTAL INSTALLATION
NOTE: The furnace must be pitched forward as shown in
Figure 17 for proper condensate drainage.
!WARNING
FIRE, EXPLOSION, AND CARBON MONOXIDE POISONING
HAZARD
Failure to follow this warning could result in personal injury, death, or
property damage.
Do not install the furnace on its back or hang furnace with control
compartment facing downward. Safety control operation will be
adversely affected. Never connect return−air ducts to the back of the
furnace.
!CAUTION
MINOR PROPERTY HAZARD
Failure to follow this caution may result in minor property damage.
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.
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.
20440 01 4300 02
Specifications subject to change without notice.
Page 21
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 23
Furnace, Plenum, and Coil
Assembly on a Combustible Floor
EAM4X, END4X, ENW4X
L11F104
Figure 24Suspended Furnace Installation
!WARNING
FIRE, EXPLOSION, AND CARBON MONOXIDE POISONING
HAZARD
Failure to follow this warning could result in personal injury, death, or
property damage.
Do not install the furnace on its back or hang furnace with control
compartment facing downward. Safety control operation will be
adversely affected. Never connect return−air ducts to the back of the
furnace.
Suspended Furnace Support
The furnace may be supported under the entire length of the
furnace with threaded rod and angle iron. (See Figure 24)
Secure angle iron to bottom of furnace as shown.
Platform Furnace Support
Construct working platform at location where all required
furnace clearances are met. (See Table 1 and Figure 25) 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.
COMBUSTION − AIR PIPE
(SEE VENTING SECTION)
2−in.
(51 mm)
A11155
NOTE: Local codes may require a drain pan and condensate trap when a condensing furnace is installed over a finished
ceiling
440 01 4300 0221
Specifications subject to change without notice.
Page 22
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 25Working Platform for Attic Installation
COMBUSTION − AIR PIPE
(SEE VENTING SECTION)
2−in.
(51 mm)
ROLLOUT PROTECTION REQUIRED Install 1.2” x 22” (305 x 559
mm) sheet metal in front of burner
compartment area.
A11154
NOTE: Local codes may require a drain pan and condensate trap when a condensing furnace is installed over a finished
ceiling
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 25 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 21) 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
Return Air Connections
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 28)
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 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 18)
2.Remove bottom plate.
3.Remove bottom closure panel.
4.Reinstall bottom plate and screws.
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed
in bottom return−air opening. This panel MUST be in place
when side return air inlet(s) are used without a bottom return air
inlet.
Not all horizontal furnaces are approved for side return air
connections (See Figure 28)
supply−side accessories MUST be connected to duct external
to furnace main casing.
22440 01 4300 02
Specifications subject to change without notice.
Page 23
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Filter Arrangement
!WARNING
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.
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 27, Figure 29, andFigure 30)
For downflow applications, the filter rack (or field supplied
accessory air cleaner) must only be connected to the bottom
opening on the furnace (See Figure 26 and Figure 30 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 28. If both side and bottom openings are used inFigure 28, 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.
Table 6Filter Size Information − inch (mm)
FURNACE
CASING
WIDTH
17-1/2
(445)
21 (533)
24-1/2
(622)
SIDE RETURN
16 x 25 x 3/4
(406 x 635 x 19)
16 x 25 x 3/4
(406 x 635 x 19)
16 x 25 x 3/4
(406 x 635 x 19)
FILTER SIZE
16 x 25 x 3/4
(406 x 635 x 19)
20 x 25 x 3/4
(508 x 635 x 19)
24 x 25 x 3/4
(610 x 635 x 19)
BOTTOM
RETURN
FILTER
TYPE
Washable*
Washable*
Washable*
* Recommended to maintain air filter face velocity. See Product Data for part
number.
Refer to the instructions supplied with the Filter Rack or
accessory air filterfor 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
Table 7 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.
NOTICE
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.
440 01 4300 0223
Specifications subject to change without notice.
Page 24
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Table 7Filter Media Pressure Drop (Clean) Versus Airflow - in. w.c. (Pa)
* 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 8Filter Media Pressure Drop (Clean) Versus Velocity - in. w.c. (Pa)
* Representative estimates from filter manufacturer data sheets.
See manufacturers’ specifications for pressure drop versus airflow data for specific filter media.
24440 01 4300 02
Representative After-Market Filter Media*
Fiberglass*Pleated*
Representative After-Market Filter Media*
Fiberglass*Pleated*
Representative After-Market Filter Media*
Fiberglass*Pleated*
Representative AfterMarket Filter Media*
Fiberglass*Pleated*
Specifications subject to change without notice.
Page 25
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
)
)
Figure 26
Figure 27
Downflow Return Air
Configurations and Restrictions
L10F033
Upflow Return Air Configurations
and Restrictions
External Filter Cabinet Configurations
Figure 29Accessory Side Filter Rack
FURNACE
FILTER
FRAME
DOOR
TABS
Figure 28
HORIZONTAL TOP
RETURN NOT
PERMITTED FOR
ANY MODEL
L10F032
Horizontal Return Air
Configurations and Restrictions
17 ⅛”
(43.5 cm)
1 ¼”
(3 cm)
(TYP.)
1
/
4”
1
(3 cm)
FILTER
25 ⅛”
(64 cm)
23 ⅛”
(59 cm)
OPENING
⅜”
(1 cm)
TABS
½”
(1.3 cm)
L10F027
2 ⅜”
(6 cm
¾”
(2 cm)
16 ⅛”
(41 cm
14 ½”
(37 cm)
OPENING
L12F023
SIDE RETURN AIR NOT PERMITTED FOR 2000 CFM AND ABOVE OF AIR
FLOW
440 01 4300 0225
L10F034
Specifications subject to change without notice.
Page 26
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 30Accessory Bottom Filter Rack
L10F031
B
A
A
22−5/16
(566.4)
28−7/16
(722.2)
2−3/16
(55.5)
Table 9Dimensional Drawing − inch (mm)
KIT NO.
NAHB00601FF
NAHB00701FF
NAHB00801FF
FURNACE
WIDTH
17−1/2
(444.5)
21
(533.4)
24−1/2
(622.3)
AB
14−5/8
(371.5)
18−1/8
(460.4)
21−5/8
(549.3)
17−5/8
(447.7)
21−1/8
(536.6)
24−5/8
(625.5)
Air Ducts
NOTICE
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 AirSystems 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.
Ductwork passing through unconditioned space should be
insulated to enhance system performance. When air
conditioning is used, a vapor barrier is recommended.
Maintain a 1−in. (25 mm) clearance from combustible materials
to supply air ductwork for a distance of 36−in. (914 mm)
horizontally from the furnace. See NFPA 90B or local code for
further requirements.
Return 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.
Ductwork Acoustical Treatment
NOTE: Metal duct systems that do not have a 90 degree elbow
and 10 ft. (3 M) of main duct to the first branch take−off may
require internal acoustical lining. As an alternative, fibrous
ductwork may be used if constructed and installed in
accordance with the latest edition of SMACNA construction
standard on fibrous glass ducts. Both acoustical lining and
fibrous ductwork shall comply with NFPA 90B as tested by UL
Standard 181 for Class 1 Rigid air ducts.
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.
26440 01 4300 02
Specifications subject to change without notice.
Page 27
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
GAS PIPING
!WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Never purge a gas line into a combustion chamber. Never test for gas
leaks with an open flame. Use a commercially available soap solution
made specifically for the detection of leaks to check all connections. A
fire or explosion may result causing property damage, personal injury
or loss of life.
!WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Use proper length of pipe to avoid stress on gas control manifold and
a gas leak.
!WARNING
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Gas valve inlet and/or inlet pipe must remain capped until gas supply
line is permanently installed to protect the valve from moisture and
debris. Also, install a sediment trap in the gas supply piping at the inlet
to the gas valve.
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.
NOTICE
!WARNING
FIRE OR EXPLOSION HAZARD
A failure to follow this warning could result in personal injury, death, and/
or property damage.
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.
!CAUTION
FURNACE DAMAGE HAZARD
Failure to follow this caution may result in furnace damage.
Connect gas pipe to furnace using a backup wrench to avoid damaging
gas controls and burner misalignment.
Table 10Maximum Capacity of Pipe
NOMINAL
IRON PIPE
SIZE
IN. (MM)
1/2 (13)
3/4 (19)
1 (25)
1‐1/4 (32)
1‐1/2 (39)
* Cubic ft of gas per hr for 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 10
above, and 6.2 of NFPA54/ANSI Z223.1-2012.
INTERNAL
DIA.
IN. (MM)
0.622
(158)
0.824 (20.9)360250200170151
1.049 (26.6)680465375320285
1.380 (35.0)1400950770660580
1.610 (40.9)210014601180990900
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 31. 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 31Typical Gas Pipe Arrangement
LENGTH OF PIPE − FT (M)
10
(3.0)20(6.0)30(9.1)40(12.1)50(15.2)
175120978273
In the state of Massachusetts:
1.Gas supply connections MUST be performed by a licensed plumber or gas fitter.
2.When flexible connectors are used, the maximum
length shall not exceed 36−in. (915 mm).
3.When lever handle type manual equipment shutoff
valves are used, they shall be T−handle valves.
4.The use of copper tubing for gas piping is NOT approved by the state of Massachusetts.
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.
440 01 4300 0227
L10F030
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.
Specifications subject to change without notice.
Page 28
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Piping should be pressure and leak tested in accordance with
the current addition of the NFGC in the United States, local,
and national plumbing and gas codes before the furnace has
been connected. Refer to current edition of NSCNGPIC in
Canada. After all connections have been made, purge lines
and check for leakage at furnace prior to operating furnace.
NOTE: The furnace gas control valve inlet pressure tap
connection is suitable to use as test gauge connection
providing test pressure DOES NOT exceed maximum 0.5 psig
(14−in. w.c.) stated on gas control valve. (See Figure 32)
Figure 32
Inlet
Pressure Tap
ON/OFF Switch
Redundant Automatic Control
Valve (Modulating)
MODULATING
Min/Max Heat Adust
(Under Cap)
Turn screw 1 click per
second to adjust rate.
Clockwise to increase
rate, counter clockwise
to decrease rate.
GAS FLOW
1/2” NPT Outlet
Figure 33Gas Entry
Left Side Gas Entry. Gas Pipe
Grommet Required For Direct
Vent Applications.
Gas Pipe Grommet Required
For Direct Vent Applications
A11338
ELECTRICAL CONNECTIONS
!
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD
Failure to follow safety warnings could result in dangerous operation,
serious injury, death or property damage.
Improper servicing could result in dangerous operation, serious
injury, death or property damage.
Before servicing, disconnect all electrical power to fur-
nace.
When servicing controls, label all wires prior to discon-
necting. Reconnect wires correctly.
Verify proper operation after servicing.
WARNING
Manifold
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 33)
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 33)
!WARNING
ELECTRICAL 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 34 for field wiring diagram showing typical field
115 −v wiring. Check all factory and field electrical connections
for tightness.
Field−supplied wiring shall conform with the limitations of 63°F
(33°C) rise.
!WARNING
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 NEC ANSI/NFPA 70−2011 or local codes to minimize personal injury
if an electrical fault should occur. In Canada, refer to Canadian Electrical
Code CSA C22.1. 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.
28440 01 4300 02
Specifications subject to change without notice.
Page 29
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
!CAUTION
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
not operate if polarity is incorrect or if the furnace is not
grounded.
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 Table 11 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.
!WARNING
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.
SWITCH
COPPER
WIRE ONLY
ALUMINUM
WIRE
A11146
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.
J−Box Installation
!WARNING
FIRE OR ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, death, or
property damage.
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.
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 upflow position. (See Figure 35)
Figure 34Heating and Cooling Application Wiring Diagram with Single−Stage Thermostat
FIELD 24-VOLT WIRING
FIELD 115-, 208/230-, 460-VOLT WIRING
FACTORY 24-VOLT WIRING
FACTORY 115-VOLT WIRING
BLOWER
DOOR
SWITCH
BLK
WHT
GND
115-VOLT FIELD-
SUPPLIED
FUSED
DISCONNECT
BLK
WHT
JUNCTION
BOX
FIVE
WIRE
THREE-WIRE
HEATING-
ONLY
FURNACE
W2
C
COM
O
N
W/W1
T
Y/Y2
R
O
R
L
G
24-VOLT
TERMINAL
BLOCK
NOTE 2
WC YRG
NOTE 1
NOTES: 1.
Connect Y/Y2-terminal as shown for proper operation.
Some thermostats require a "C" terminal connection as shown.
2.
If any of the original wire, as supplied, must be replaced, use
3.
same type or equivalent wire.
1-STAGE
THERMOSTAT
TERMINALS
CONDENSING
UNIT
FIELD-SUPPLIED
FUSED DISCONNECT
GND
208/230- OR
460-VOLT
THREE
PHASE
208/230VOLT
SINGLE
PHASE
A11401
440 01 4300 0229
Specifications subject to change without notice.
Page 30
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 35Optional J−Box Locations
Representative drawing only, some models may vary in appearance.
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 36)
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 37)
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 36J−Box Bracket Installation
J−BOX
MOUNTING
SCREWS
J−BOX
MOUNTING
BRACKET
GROUND
SCREW
J−BOX COVER
30440 01 4300 02
5.Route external field power wires through holes in
electrical box and casing.
6.Connect field ground wire and factory ground wire to
green ground screw on J−Box mounting bracket as
shown in Figure 36.
7.Connect field power and neutral leads to furnace power
leads. as shown in Figure 34.
OPTIONAL
J−BOX
LOCATIONS
8.Attach furnace J−Box cover to mounting bracket with
screws supplied in loose parts bag. Do not pinch wires
between cover and bracket.
9.Complete external disconnect wiring and installation.
Connect line voltage leads as shown in Figure 37. Use
best practices (NEC) ANSI/NFPA 70 in U.S. for wire
bushings, strain relief, etc., and Canadian Electrical
Code CSA C22.1.
Figure 37
GROUND
L12F024
NEUTRAL
LINE
VOLTAGE
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 bracket to inside of furnace
casing. (See Figure 36)
2. Route listed power cord through 7/8−in. (22 mm)
diameter hole in casing and J−Box bracket.
3. Secure power cord to J−Box bracket with a strain relief
bushing or a connector approved for the type of cord
used.
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 wire and factory ground wire to
green ground screw on J−Box mounting bracket as
shown in Figure 36.
6. Connect power cord power and neutral leads to furnace
power leads as shown in Figure 34.
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 in Furnace J−Box
1. Install J−Box mounting bracket to inside of furnace
casing.
L12F025
Specifications subject to change without notice.
2. Route BX connector through 7/8−in. (22 mm) diameter
hole in casing and J−Box bracket.
Field−Supplied Electrical Box on
Furnace Casing
A10141
Page 31
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
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 36.
5. Connect field power and neutral leads to furnace power
leads. as shown in Figure 34.
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 Wiring
Make field 24−v connections at the 24−v terminal strip. (See
Figure 39) Connect terminal Y/Y2 as shown in Figure 34 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 38 and Figure 39)
See the Service and Technical Support manual for detailed
instructions on control wiring and setup.
Thermostats and Control Settings
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
SW1-2 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 (See Figure 38 and Figure 39)
1.Electronic Air Cleaner (EAC)
Connect an accessory Electronic Air Cleaner (if used)
using 1/4−in female quick connect terminals to the two
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.
2.Humidifier (HUM)
The HUM terminal is a 24 VAC output, energized
when the blower is operating during a call for heat.
Connect an accessory 24 VAC, 0.5 amp. Maximum (if
used) to the 1/4−in male quick−connect HUM terminal
and COM−24V screw terminal on the control board
thermostat strip.
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 39)
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.
Alternate Power Supplies
This furnace is designed to operate on a utility generated
power which has a smooth sinusoidal 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-sinusoidal may
damage the furnace or cause erratic furnace operation.
Contact the alternate power supply manufacturer for
specifications and details.
* 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’ (EAC, humidifier, etc.) full load
amps.
Time−delay type is recommended.
Length shown is as measured one way along wire path between unit and service panel for maximum 2 percent voltage drop.
PHASE
OPERATING VOLTAGE
RANGE*
Maximum*Minimum*
440 01 4300 0231
MAXIMUM
UNIT
AMPS
Specifications subject to change without notice.
UNIT
AMPACITY#
MINIMUM
WIRE
SIZE
AWG
MAXIMUM
WIRE
LENGTH
FT (M)}
MAXIMUM
FUSE OR
CKT BKR
AMPS{
Page 32
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 38Isolation Relay for Humidifiers with Internal Power Supply
To Humidifier Leads
24 V
Coil
To Humidifier Leads
Figure 39Variable Speed Furnace Control − Switch Locations
PL9
SW4
3 2 1
PL4
SW*
1
8 7 6 5 4 3 2 1
SW2SW3
OAT
O
N
PL7
To HUM 24 VAC Terminal
On Furnace Control Board
To Com/24V Screw Terminal
on Thermostat Strip
A11157
O
N
W2
Y1
DHUM
3 2 1
3 2 1
O
N
O
N
L11F080
32440 01 4300 02
Specifications subject to change without notice.
Page 33
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 39 − continued Example of Variable Speed Furnace Control for ECM Blower Motor (Modulating)
MODEL PLUG
CONNECTOR
SW1 SETUP
SWITCHES AND
BLOWER OFFï
DELAY
AIR CONDITIONING
(A/C) AIRFLOW
SETUP SWITCHES
24ïV THERMOSTAT
TERMINALS
STATUS AND COMM
LED LIGHTS
3ïAMP FUSE
TRANSFORMER 24ïVAC
CONNECTIONS
115ïVAC (L2) NEUTRAL
CONNECTIONS
PL1 ć LOW VOLTAGE MAIN
HARNESS CONNECTOR
COMMUNICATION
CONNECTOR
SOFTWARE
VERSION
CONTINUOUS FAN
(CF) AIRFLOW
SETUP SWITCHES
PART NUMBER AND
DATE CODE WWYY
EACï1 TERMINAL
(115ïVAC 1.0 AMP MAX.)
OUTDOOR
IR TEMP
CONNECTOR
VOLTAGE CONNECTIONS
SW4 SETUP
SWITCHES
115ïVAC (L1) LINE
PL8 ï MODULATING
GAS VALVE
CONNECTOR
HUMIDIFIER
TERMINAL (24AVAC
0.5 AMP MAX.
UPGRADE
CONNECTOR
(FACTORY
PL3 ć ECM BLOWER
HARNESS
CONNECTOR
PL2 ć HOT SURFACE
IGNITER & INDUCER
MOTOR CONNECTOR
ï
FLASH
ONLY)
L11F091
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 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. The
special vent fittings, accessory concentric vent termination kits,
and accessory external drain trap available from the furnace
manufacturer have been certified to ULC S636 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 4300 0233
GVS-65 PVC Solvent Cement for Royal Pipe or IPEX System
t, PVC Cement for Flue Gas Venting, rated Class IIA, 65
636
(1)
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 S636, 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 all 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 spéciales pour l’installation de
ventilation au Canada
L’installation faite au Canada doit se conformer aux exigences
du code CAN/CSA B149−2010. Ce systême de ventillation doit
se composer de tuyaux, raccords, ciments et apprêts
conformes au ULC S636. La tuyauterie de ventilation des gaz,
ses accessoires, le terminal concentrique mural ainsi que
l’ensemble du drain de condensation extérieur fourni par le
fabricant de cette fournaise ont été certifiés ULC S636 pour
l’application des composantes Royal Pipe, IPEX PVC qui sont
certifiées à ce standard. Au Canada, l’apprêt et le ciment
doivent être du même fabricant que le système d’évacuation.
Specifications subject to change without notice.
Page 34
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
L’apprêt GVS-65 (Purple) et le ciment-solvant GVS-65 doivent
être utilisé avec les Royal Pipe. Système IPEX 636, apprêt
PVC/CPVC, Purple pour évacuation des gaz de combustion et
système IPEX 636(1)t, ciment PVC pour évacuation des gaz
de combustion, coté classe IIA, 65 deg C. doivent être utilisés
avec le système d’évacuation IPEX 636 – Ne pas combiner l
’apprêt et le ciment d’un manufacturier avec un système
d’évacuation d’un manufacturier différent.
Bien suivre les indications du manufacturier lors de l’utilisation de
l’apprêt et du ciment et ne pas utiliser ceux-ci si la date
d’expiration est atteinte.
L’opération sécuritaire, tel que définit par ULC S636, du système
de ventilation est basé sur les instructions d’installation suivantes,
ainsi que l’usage approprié de l’apprêt et ciment. Tout arrët feu et
solin de toit utilisés avec ce système doivent être des matériaux
listés UL. L’acceptation du standard Canadien CAN/CSA B149
est directement relié à l’installation conforme aux instructions cihaut mentionnées. Le standard Canadien recommande l’
inspection par un personel qualifié et ce, une fois par année.
Les autoritées ayant juridiction (inspecteurs de gas, inspecteurs
en bâtiments, département des incendies, etc) devraient être
consultées avant l’installation afin de déterminer si un permis est
requis.
!WARNING
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.
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 46 for Direct Vent (2−pipe)
system or Figure 47 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.
34440 01 4300 02
Specifications subject to change without notice.
Page 35
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Venting Systems
!
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 provided in accordance with:
U.S.A. Installations: Section 9.3 NFPA 54/ANSI Z223.1
1−2012, 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.
WARNING
NOTICE
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
Direct Vent (2−pipe)
Termination Kit
2−in (51 mm) Concentric
Vent Kit
3−in (76 mm) Concentric
Vent Kit
2−in (51 mm) Termination
Bracket Kit
3−in (76 mm) Termination
Bracket
Direct Vent / 2−Pipe 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 Figure 58 for references to clearances required by
National code authorities.
Vent Termination Kit for Direct
Vent (2−pipe) Systems
Diam. Of
Termination
System
Single Penetration
of Wall or Roof
Single Penetration
of Wall or Roof
2−Pipe
Termination
System
2−Pipe
Termination
System
Combustion Air
and Vent Pipes
in.(mm)
1, 1−1/2, 2, or 2−1/2
(25, 38, 51, 64 mm)
2−1/2, 3 or 4
(64, 76, 102 mm)
1, 1−1/2, 2, or 2−1/2
(25, 38, 51, 64 mm)
2−1/2, 3 or 4
(64, 76, 102 mm)
NOTICE
Optional Configuration for Combustion Air Inlet
Pipe
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 59 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.”
NOTICE
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.
WARNING
440 01 4300 0235
Specifications subject to change without notice.
Page 36
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Table 13Approved Combustion-Air and Vent Pipe, Fitting and Cement Materials (U.S.A. Installation)
Attach gaskets to vent pipe and combustion air adapters
Vent Coupling and Adapter with
Gaskets
Vent Coupling and Adapter
Figure 41Vent Pipe Flush with Adaptor
VENT PIPE ADAPTER WITH GASKET INSTALLED ON FURNACE.
VENT PIPE IS CUT FLUSH WITH TOP OF ADAPTER. PRIME AND
CEMENT VENT PIPE TO ADAPTER. ALLOW TO DRY BEFORE INSTALLING VENT COUPLING.
36440 01 4300 02
Figure 42Vent Pipe Flush Showing Coupling
ALIGN NOTCHES IN VENT PIPE COUPLING OVER STAND−
OFF ON ADAPTER. TORQUE LOWER CL AMP 15 LB−IN. WHEN
REMAINING VENT PIPE IS INSTALLED, TORQUE UPPER
CL AMP TO 15 LB−IN.
Locating the Vent Termination
A13074
A13076A
Specifications subject to change without notice.
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 58 for Direct Vent/2−Pipe system andFigure 59 for Ventilated Combustion Air system. For exterior
termination arrangements, refer to Figure 58for Direct
Vent/2−Pipe system and Figure 59 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
A13076B
Page 37
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
resistance material due to the corrosive properties of
combustion products from vent system as well as protection of
adjacent structures.
NOTICE
Recommended Support for Vent Terminations
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 location for termination, consider
the following guidelines:
1. Comply with all clearance requirements stated in
Figure 58 or Figure 59 per application.
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 System
Direct vent (2−pipe) vent and combustion air pipes must
terminate outside the structure. See Figure 58 for references to
vent clearances required by National code authorities.
Allowable vent and combustion air terminations are shown in
Figure 46.
!
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.
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
1−2012, 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.
WARNING
Ventilated Combustion Air
The vent pipe for a Ventilated Combustion Air System must
terminate outdoors. See Figure 58 for references to vent
clearances required by National code authorities. Allowable
vent terminations are shown in Figure 47. The combustion air
pipe terminates in a well−ventilated attic or crawl space. Follow
the clearances as shown in Figure 56 and Figure 57.
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
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 S636
must be used. (See Figure 43 and Figure 45)
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 43 and Figure 45 for terminations approved for
use in Alberta and Saskatchewan.
from the adjacent property line
440 01 4300 0237
Specifications subject to change without notice.
Page 38
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 43Tee at Termination Outlet
OPTIONAL TERMINATION
BRACKET FOR 2-PIPE
TERMINATIONS
12 IN. (305 MM) MIN.
SEPARATION BETWEEN
BOTTOM OF COMBUSTION
AIR AND BOTTOM OF VENT.
12-IN. (305 MM)
ABOVE ANTICIPATED
SNOW LEVEL
Figure 45Vent Terminations
OPTIONAL
BRACKET
COUPLING
(ELBOW PARALLEL TO WALL)
COMBUSTION-AIR
12 IN. (305 MM) MIN. SEPARATION
BETWEEN BOTTOM OF
COMBUSTION AIR AND
BOTTOM OF VENT.
MAINTAIN 12 IN. (305 MM)
CLEARANCE ABOVE
HIGHEST ANTICIPATED
SNOW LEVEL OR GRADE,
WHICHEVER IS GREATER.
A13078B
Figure 44
Sample Inlet Air Pipe Connection
for Polypropylene Venting Systems
EXAMPLE FOR
UPFLOW INSTALLATIONS.
MAY BE APPLIED TO
OTHER CONFIGURATIONS.
A13078A
EXHAUST
OVERHANG
CLEARANCE TO OVERHANG PER CODE
12 IN.
(305 MM) MIN. GROUND
LEVEL OR ANTICIPATED SNOW LEVEL
A13078C
38440 01 4300 02
A12220
Specifications subject to change without notice.
Page 39
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 46Combustion Air and Vent Pipe Termination for Direct Vent (2−Pipe) System
Vertical separation between
combustion air and vent
8 ¾ in. (222mm) for 3 in.(76mm)
6 ¾ in. (172mm) for 2in. (51mm)
Maintain 12 in. (305mm)
min. Clearance above
highest anticipated snow
level maximum of 24 in.
(614mm) above roof
18 in. Maximum
(457mm)
0
90
At least 36 in.
(914mm)
At least 36 in.
(914mm)
Roof Termination (Preferred)
Note:
“A” denotes 0 To 2 in. (51mm)
A
Between the first 2 vents Third
vent (and fourth vent, if used)
must be 36 in. Away (91 4mm)
Abandoned masonry used
as raceway (per code)
Concentric Vent and Combustion Air
Side Termination
12 in. Min from
overhang or
roof (Typ.)
A
12 in. (305mm) separation
between bottom of com−
bustion air and bottom of
vent (Typ.)
Maintain 12 in. (305mm) min.
Clearance above highest an−
ticipated snow level or grade
whichever is greater (Typ.)
At least 36 in.
(914mm)
Concentric Vent and Combustion Air
Roof Termination (preferred)
A
At least 36 in.
(914mm)
Note:
“A” denotes 0 To 2 in. (51mm)
Between the first 2 vents Third
vent (and fourth vent, if used) must
be 36 in . Away (914mm)
A
Note:
36−in. separation between
pairs of inlets only required
for direct−vent systems
Maintain 12 in. (305mm) min. Clearance
above highest anticipated snow level
maximum of 24 in. (614mm) above roof
1 in. (25mm) maximum
(Typ.) from wall to inlet
12 in. From Overhang
or roof (Typ.)
A
Maintain 12 in. (305mm) min. Clear−
At least 36 in.
(914mm)
Side wall termination of
less than 12 in. (305mm)
above highest snow level
ance above highest anticipated snow
level or grade whichever is greater
(Typ.)
L12F044
Figure 47Vent Pipe Termination for Ventilated Combustion Air System
Roof Termination (Preferred)
Ven t
(305mm)
Maintain 12 in .
minimum clearance
above highest anticipated
snow level maximum of
24 in. (610mm) above roof.
Abandoned masonry
used as raceway
(per code)
6 in. (152mm) minimum clearance
between wall and end of vent pipe.
10 in. (254mm) maximum pipe length
12 in. (305 mm) min. from
overhang or roof
90°
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
Side wall termination
with 2 elbows (preferred)
whichever is greater.
12 in. min. (305 mm)from
overhang or roof
Sidewall Termination
with Straight Pipe (preferred)
Maintain 12 in. (305mm)
minimum clearance
above highest anticipated
snow level or grade
whichever is greater
A05091
440 01 4300 0239
Specifications subject to change without notice.
Page 40
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Size the Vent and Combustion Air Pipes
General
Approved 2−pipe
Vent or Combustion Air
Pipe Diameters
1 1/2−in.XN/AN/A
2−in.XN/AN/A
2 1/2−in.N/AXN/A
3−in.N/AXN/A
4−in.N/AXX
Note: Optional accessory 2−pipe termination brackets are
sized for 2−in. and 3−in. Pipe. If a termination bracket is
required for a 4−in. Termination, field fabricate the necessary
brackets and clamps.
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
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 (see Figure 48).
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.
Combustion−Air and Vent Pipe
Figure 48
Diameter Transition Location and
Elbow Configuration
termination fittings
2−in.3−in.4−in.
NOTICE
Optional Configuration for Combustion Air Inlet
Pipe
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
Optional Combustion Air Inlet
Moisture Trap
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.
NOT IN
HORIZONTAL
SECTION
FURNACE
PIPE DIAMENTER
TRANSITION IN
SECTION
A93034
40440 01 4300 02
Specifications subject to change without notice.
Page 41
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 49Optional Combustion Air Inlet Moisture Trap
TOCODE−APPROVEDDRAINORCONDENSATEPUMP
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 11. 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.
NOTICE
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 equivalencies 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
L12F028
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.
440 01 4300 0241
Specifications subject to change without notice.
Page 42
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
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.
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 Air and Vent Piping Insulation
Guidelines
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
!WARNING
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 12)
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 lb-in. See Figure 51 through Figure 54.
Figure 50Inducer Vent Elbow − Variable
MODULATING INDUCER ASSEMBLY
VENT ELBOW CL AMP
TORQUE 15 LB−IN.
INDUCER
OUTLET
VENT PIPE
CL AMP
TORQUE 15
LB−IN.
42440 01 4300 02
Specifications subject to change without notice.
VENT
ELBOW
Page 43
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 51Upflow Configurations
UPFLOW LEFT − VENT CONFIGURATION
Representative drawing only, some models may vary in appearance.
Figure 52Downflow Configurations
A11309
DOWNFLOW LEFT − VENT CONFIGURATION
Representative drawing only, some models may vary in appearance.
A11311
UPFLOW RIGHT − VENT CONFIGURATION
Representative drawing only, some models may vary in appearance.
UPFLOW VERTICAL − VENT CONFIGURATION
Representative drawing only, some models may vary in appearance.
* See NOTES following figures.
A11308
A11310
DOWNFLOW RIGHT − VENT CONFIGURATION
Representative drawing only, some models may vary in appearance.
DOWNFLOW VERTICAL − VENT CONFIGURATION
Requires Accessory Internal Vent Kit
See Specification Sheets for current kit number
Representative drawing only, some models may vary in appearance.
* See NOTES following figures.
A11312
L11F063
440 01 4300 0243
Specifications subject to change without notice.
Page 44
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 53Horizontal Left Configurations
HORIZONTAL LEFT − VERTICAL VENT CONFIGURATION
Representative drawing only, some models may vary in appearance.
Figure 54Horizontal Right Configurations
HORIZONTAL RIGHT − VERTICAL VENT CONFIGURATION
Representative drawing only, some models may vary in appearance.
HORIZONTAL LEFT − LEFT VENT CONFIGURATION
Representative drawing only, some models may vary in appearance.
HORIZONTAL LEFT − RIGHT VENT CONFIGURATION*
* Requires accessory Internal Vent Kit
Representative drawing only, some models may vary in appearance.
* See NOTES following figures.
HORIZONTAL RIGHT − LEFT VENT CONFIGURATION
Representative drawing only, some models may vary in appearance.
HORIZONTAL RIGHT − RIGHT VENT CONFIGURATION
Representative drawing only, some models may vary in appearance.
* See NOTES following figures.
44440 01 4300 02
Specifications subject to change without notice.
Page 45
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
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 with gasket to
furnace.
7. Attach combustion air pipe to adapter with silicone. Pilot
drill a 1/8−in. Hole in adapter and secure with a #7 x1/2−in. Sheet metal screw.
Installing the Vent Pipe Adapter and
Combustion Air Pipe Adapter
!WARNING
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.
!
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.
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 40.
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.
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.
WARNING
6. Tighten the clamp around the outlet of the vent elbow.
Torque the clamp to 15 lb−in.
NOTICE
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 lb−in.
8. Torque clamp on vent coupling 15 lb−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
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 45,
Figure 46, Figure 56 and Figure 57. For ventilated
combustion air terminations, see Figure 47.
440 01 4300 0245
Specifications subject to change without notice.
Page 46
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
19. Use appropriate methods to seal openings where
combustion air pipe and vent pipe pass through roof or
sidewall.
!
WARNING
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.
Optional Installation of the vent pipe
NOTE: DO NOT USE THIS TECHNIQUE FOR
POLYPROPYLENE VENTING SYSTEMS.
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 41 and Figure 42
1. Insert a length of vent pipe through the casing into the
outlet of the vent elbow.
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 lb−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 lb−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”
NOTICE
For Polypropylene Venting Systems
When using polypropylene venting systems, all venting materials used, including the vent terminations, must be from the
same manufacturer.
Figure 55Combustion Air Pipe
12" (256mm) minimum
to
60”(1524 mm) or
1 additional elbow maximum
CASING SIDE OR TOP ATTACHMENT
(NON-DIRECT VENT FOR ALL MODELS EXCEPT MODULATING UNLESS
COMBUSTION AIR PIPE
INSTALLED IN ATTIC OR CRAWL SPACE)
A13406
Installing the Vent Termination
Roof Terminations
A roof termination of any type will require a 4-in. (102 mm)
flashing for a 2−in. (50 mm ND) concentric vent or a 5−in. (127
mm) diameter flashing for a 3-in. (80 mm ND) concentric vent
kit. For 2-pipe or single pipe vent systems, a flashing for each
pipe of the required diameter will be necessary.
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.
Concentric Vent
Single or multiple concentric vent must be installed as shown in
Figure 46. Maintain the required separation distance between
vents or pairs of vents as shown in Figure 46 and all
clearance shown in Figure 58.
NOTE: Follow the instructions of the vent terminal
manufacturer. These instructions are provided as a reference
only.
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.
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.
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 46 and Figure 47. Maintain the required separation
distance between vents or pairs of vents as shown in
Figure 46 and Figure 47 and all clearance shown in Figure 58
or Figure 59.
46440 01 4300 02
Specifications subject to change without notice.
Page 47
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
NOTICE
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 Table 12 or by
field-supplied 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.
Sidewall Terminations
Concentric 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. kit, or one 5−in.
diameter hole for 3−in. kit.
2. Loosely assemble concentric vent/combustion air
termination components together using instructions in kit.
3. Slide assembled kit with rain shield REMOVED through
hole.
NOTE: Do not allow insulation or other materials to accumulate
inside of pipe assembly when installing it through hole.
4. Locate assembly through sidewall with rain shield
positioned no more than 1−in. (25 mm) from wall as
shown inFigure 46.
5. Disassemble loose pipe fittings. Clean and cement using
same procedures as used for system piping. DO NOT
CEMENT POLYPROPYLENE FITTINGS.
Direct Vent (2-Pipe) Termination
NOTE: Follow the instructions of the vent terminal
manufacturer. These instructions are provided as a reference,
only.
NOTICE
Recommended Support 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.
Determine an appropriate location for termination kit using the
guidelines provided in section “Locating The Vent Termination”
in this instruction.
1. Cut two holes, one for each pipe, of appropriate size for
pipe size being used.
2. Loosely install elbow in bracket (if used) and place
assembly on combustion−air pipe.
3. Install bracket as shown in Figure 43 and Figure 45.
NOTE: For applications using vent pipe option indicated by
dashed lines in Figure 46 and Figure 47, rotate vent elbow 90
from position.
4. Disassemble loose pipe fittings. Clean and cement using
same procedures as used for system piping. DO NOT
CEMENT POLYPROPYLENE FITTINGS.
For Ventilated Combustion Air Terminations, terminate as
shown in Figure 47.
(Direct Vent / 2-Pipe System ONLY)
When two or more furnaces are vented near each other, two
vent terminations may be installed as shown in Figure 43 and
Figure 45, 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 43 and Figure 45 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.
440 01 4300 0247
Specifications subject to change without notice.
Page 48
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 56Crawl Space Vent Termination
Ventilated Combustion
Air intake pipe
Pipe hangar
3” (76 mm)
Ventilated Combustion Air
intake termination in crawl
space
Figure 57Attic Vent Termination
12” (305 mm)
CRAWL SPACE
Ventilated Combustion
Air intake pipe
Vent through
roof flashing
12” (305 mm) min. above
higest level of insulation
48440 01 4300 02
ATTIC
Specifications subject to change without notice.
L11F016
Page 49
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 58Direct Vent Termination Clearance
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.
ItemClearance Description
Clearance above grade, veranda, porch, deck, balcony or
A
BClearance to a window or door that may be opened
CClearance to a permanently closed window
Vertical clearance to a ventilated soffit located above the
terminal within a horizontal distance of 2 feet (61 cm) from
D
EClearance to an unventilated soffit
FClearance to an outside corner
GClearance to an inside corner
Clearance to each side of the centerline extended above
H
KClearance to a mechanical air supply inlet6 ft. (1.8 M)3ft. (.9 M)
LClearance under a veranda, porch, deck, or balcony
M
N
0Clearance from a plumbing vent stack3 ft. (.9 M)3 ft. (.9 M)
P
u greater than, w greater than or equal to, t less than, v less than or equal to
electrical meter or gas service regulator assembly
IClearance to service regulator vent outlet3ft. (.9 M)See Note 4.
Clearance to non—mechanical air supply inlet to building or
J
the combustion air inlet to any other appliance
Clearance to each side of the centerline extended above or
below vent terminal of the furnace to a dryer or water heater
vent, or other appliance's vent intake or exhaust
Furnace combustion air intake clearance to a water heater
vent, dryer vent or other types of appliance exhausts.
Clearance above paved sidewalk or paved driveway located
anticipated snow level
the centerline of the terminal
on public property
Notes:
1.In accordance with the current CAN/CSA B149.1, Natural Gas and Propane Installation Code.
2.In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
3.NOTE: This table is based upon National codes for gas appliances, and are provided as a reference.
Refer to Local codes which may supersede these standards and/or recommendations.
4.For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA B 149.1, clearances shall be in accordance with local installation codes and the requirements of the
gas supplier and the manufacturer's installation instructions.
5.When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the combustion products
of adjacent vents. Recirculation can cause poor combustion, inlet condensate problems, vent termination venting, and/or accelerated corrosion of the heat exchangers.
6.Design and position vent outlets to avoid ice buildup on and moisture damage to surrounding surfaces.
7.The vent for this appliance shall not terminate:
a. Near soffit vents of crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage; or
b. Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.
8.Avoid venting under a deck or large overhang. Recirculation could occur and cause performance or system problems. Ice buildup may occur.
440 01 4300 0249
V
V
Canadian Installations
(per CAN/CSA B149.1)
12 in. (305 mm)
18 in. (457 mm) above roof surface.
12 in. (305 mm) for appliances >10,000 Btuh (3 kW)
36 in. (914 mm) for appliances >100,000 Btuh (30 kW)
For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA B149.1, clearances shall be in accordance with local
36 in. (914 mm) for appliances >100,000 Btuh (30 kW)
Permitted only if veranda, porch, deck, or balcony is fully open on a
Vent shall not terminate above a sidewalk or paved driveway that is
located between two single family dwellings and serves both
Specifications subject to change without notice.
and </=100,000 Btuh ( 30 kW),
installation codes and the requirements of the gas supplier and the manufacturer's installation instructions.
3 ft. (.9 M) within 15 ft. (4.6 M)
above the meter/regulator assembly.
12 in. (305 mm) for appliances >10,000 Btuh(3 kW)
and </= 100,000 Btuh ( 30 kW),
12 in. (305 mm).
minimum of two sides beneath the floor.
12 in. (305 mm)12 in. (305 mm)
3 ft. (.9 M)3 ft. (.9 M)
7 ft. (2.1 M).
dwellings.
(1 )
(per ANSI Z223.1/NFPA 54)
9 in. (229 mm) for appliances >10,000 Btuh (3 kW)
and </= 50,000 Btuh ( 15 kW),
12 in. (305 mm) for appliances >50,000 Btuh (15kW)
Manufacturer's Recommendation: See Notes 38.
3 ft. (.9 M) within 15 ft. (4.6 M)
above the meter/regulator assembly.
9 in. (9 mm) for appliances >10,000 Btuh (3 kW)
and </= 50,000 Btuh (15 kW),
12 in.(305 mm) for appliances >50,000 Btuh (15kW)
Manufacturer's Recommendation: See Notes 38.
Manufacturer's Recommendation: See Notes 38.
U.S. Installations
12 in. (305 mm)
See Note 4.
See Note 4.
(2 )
25−24−65−2
Page 50
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
Figure 59Other than Direct Vent Clearance − Ventilated Combustion Air Option
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
Clearance above grade, veranda, porch, deck, balcony or
A
BClearance to a window or door that may be opened
CClearance to a permanently closed window
Vertical clearance to a ventilated soffit located above the
terminal within a horizontal distance of 2 feet (61 cm) from
D
EClearance to an unventilated soffit
FClearance to an outside corner
GClearance to an inside corner
Clearance to each side of the centerline extended above
H
IClearance to service regulator vent outlet3ft. (.9 M)See Note 4.
J
KClearance to a mechanical air supply inlet6 ft. (1.8 M)3ft. (.9 M)
LClearance under a veranda, porch, deck, or balcony
M
N
0Clearance from a plumbing vent stack3 ft. (.9 M)3 ft. (.9 M)
P
u greater than, w greater than or equal to, t less than, v less than or equal to
electrical meter or gas service regulator assembly
Clearance to non—mechanical air supply inlet to building or
the combustion air inlet to any other appliance
Clearance to each side of the centerline extended above or
below vent terminal of the furnace to a dryer or water heater
vent, or other appliance's direct vent intake or exhaust
Clearance above paved sidewalk or paved driveway located
Clearance Description
anticipated snow level
the centerline of the terminal
Clearance to a moisture exhaust duct
(dryer vent, spa exhaust, etc.)
on public property
Notes:
1.In accordance with the current CAN/CSA B149.1, Natural Gas and Propane Installation Code.
2.In accordance with the current ANSI Z223.1/NFPA 54, National Fuel Gas Code
3.NOTE: This table is based upon National codes for gas appliances, and are provided as a reference.
Refer to Local codes which may supersede these standards and/or recommendations.
4.For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA B 149.1, clearances shall be in accordance with local installation codes and the requirements of the
gas supplier and the manufacturer's installation instructions.
5.When locating vent terminations, consideration must be given to prevailing winds, location, and other conditions which may cause recirculation of the combustion products
of adjacent vents. Recirculation can cause poor combustion, inlet condensation problems, vent termination icing, and/or accelerated corrosion of the heat exchangers.
6.Design and position vent outlets to avoid ice buildup on and moisture damage to surrounding surfaces.
7.The vent for this appliance shall not terminate:
a. Near soffit vents of crawl space vents or other areas where condensate or vapor could create a nuisance or hazard or property damage; or
b. Where condensate vapor could cause damage or could be detrimental to the operation of regulators, relief valves, or other equipment.
8.These National standards apply to all nondirectvent gas appliances. Contact Local code officials for additional requirements and/or exclusions.
50440 01 4300 02
V
V
Canadian Installations
(per CAN/CSA B149.1)
12 in. (305 mm)
18 in. (457 mm) above roof surface.
12 in. (305 mm) for appliances >10,000 Btuh (3 kW)
and </=100,000 Btuh ( 30 kW),
36 in. (914 mm) for appliances >100,000 Btuh (30 kW)
For clearances not specified in ANSI Z223.1/NFPA 54 or CAN/CSA B149.1, clearances shall be in accordance with local
installation codes and the requirements of the gas supplier and the manufacturer's installation instructions.
3 ft. (.9 M) within 15 ft. (4.6 M)
above the meter/regulator assembly.
12 in. (305 mm) for appliances >10,000 Btuh(3 kW)
and </= 100,000 Btuh ( 30 kW),
36 in. (914 mm) for appliances >100,000 Btuh (30 kW)
Permitted only if veranda, porch, deck, or balcony is fully open
on a minimum of two sides beneath the floor.
Vent shall not terminate above a sidewalk or paved driveway
that is located between two singlefamily dwellings and serves
Specifications subject to change without notice.
12 in. (305 mm).
12 in. (305 mm)12 in. (305 mm)
12 in. (305 mm) See Note 4.12 in. (305 mm) See Note 4.
DIRECT VENT (2-PIPE) AND VENTILATED COMBUSTION AIR
Vent Pipe Diameter (in.)
Table 15DEDUCTIONS FROM MAXIMUM EQUIVALENT VENT LENGTH - Feet (Meters)
Pipe Diameter (in):1-1/222-1/234
Mitered 90º Elbow8(2.4)8(2.4)8(2.4)8(2.4)8(2.4)
Medium Radius 90º Elbow5(1.5)5(1.5)5(1.5)5(1.5)5(1.5)
Long Radius 90º Elbow3(0.9)3(0.9)3(0.9)3(0.9)3(0.9)
Mitered 45º Elbow4(1.2)4(1.2)4(1.2)4(1.2)4(1.2)
Medium Radius 45º Elbow2.5(0.8)2.5(0.8)2.5(0.8)2.5(0.8)2.5(0.8)
Long Radius 45º Elbow1.5(0.5)1.5(0.5)1.5(0.5)1.5(0.5)1.5(0.5)
Tee16(4.9)16(4.9)16(4.9)16(4.9)16(4.9)
Concentric Vent TerminationNA0(0.0)NA0(0.0)NA
Standard Vent Termination0(0.0)0(0.0)0(0.0)0(0.0)0(0.0)
2
Figure 60Elbows Configurations
LONGMEDIUMMITERED
L11F082
Figure 61Vent Terminal Configurations
STANDARD 2−IN.,
3−IN. OR OPTIONAL
4−IN. TERMINATION
CONCENTRIC
L11F083
A13110
Venting System Length Calculations
The Total Equivalent Vent Length for EACH combustion air or vent pipe equals the length of the venting system, plus the equivalent
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 termination systems. DO NOT ASSUME
that one foot of flexible vent pipe equals one foot of straight PVC/ABS DWV vent pipe.
Compare the Total Equivalent Vent Length to the Maximum Equivalent Vent Lengths in Table 14 and Table 16.
440 01 4300 0251
Specifications subject to change without notice.
Page 52
INSTALLATION INSTRUCTIONSGas Furnace: (F/G)9MAE
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) 90º long-radius elbows, (2) 45º 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.
(30 M)
9 ft.
(2.7 M)
3 ft.
(0.9 M)
112 ft.
(34 M)
127 ft.
(38.7 M)
Measure the required linear length of air inlet
and vent pipe; insert the longest of the two here
Add equiv length of (3) 90º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of (2) 45º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of factory concentric vent term0 ft. From Table 15
Add correction for flexible vent pipe, if any0 ft.
Total Equivalent Vent Length (TEVL)
Maximum Equivalent Vent Length (MEVL)
Is TEVL less than MEVL?YES Therefore, 2” pipe MAY be used
3x
2x
3 ft
(0.9 M)
1.5 ft
(0.5 M)
Use length of the longer of the vent
or air inlet piping system
From Table 15
From Table 15
From Vent Manufacturer’s
instructions; zero for PVC/ABS DWV
Add all of the above lines
For 2” pipe from Table 14
Example 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) 90º 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 pipe equals 1.8 meters of PVC/ABS pipe. VERIFY FROM VENT
MANUFACTURER’S INSTRUCTIONS.
Can this application use 60mm (o.d.) polypropylene vent piping? If not, what size piping can be used?
=
=
100 ft.
(30 M)
9 ft.
(2.7 M)
0 ft.
(0 M)
30 ft.
(9 M)
36 ft.
(11 M)
175 ft.
(53 M)
127 ft.
(38.7 M)
250 ft.
(76.2 M)
Measure the required linear length of air inlet and
vent pipe; insert the longest of the two here
Add equiv length of (3) 90º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of (2) 45º long-radius elbows
(use the highest number of elbows for either the
vent or inlet pipe)
Add equiv length of factory concentric vent term9 Mx3.3 ft/M=
Add correction for flexible vent pipe, if any1.8x
Total Equivalent Vent Length (TEVL)
Maximum Equivalent Vent Length (MEVL)
Is TEVL less than MEVL?NO
Maximum Equivalent Vent Length (MEVL)
Is TEVL less than MEVL?YESTherefore, 80mm pipe MAY be used
3x
0x=
3 ft
(0.9 M)
20 ft
(6.1 M)
Use length of the longer of the vent
or air inlet piping system