Royalton B2332509, B2332516, B2332515, B2332514, B2332510 User Manual
INSTALLATION INSTRUCTIONS
A80UH1E & 80G1UHE
Warm Air Gas Furnace
Upow / Horizontal Left and Right Air Discharge
This manual must be left with the homeowner for future reference.
This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in
manuals, be alert to the potential for personal injury or death.
Table of Contents
Unit Dimensions ..........................................................2
A80UH1E & 80G1UHE Gas Furnace ..........................3
Shipping and Packing List ...........................................3
Safety Information .......................................................3
General ........................................................................4
Combustion, Dilution & Ventilation Air .........................5
Filters .........................................................................10
Duct System ..............................................................10
Venting.......................................................................11
Gas Piping .................................................................18
Electrical ....................................................................20
Unit Start-Up ..............................................................24
Blower Performance ..................................................29
Service.......................................................................32
Repair Parts List ........................................................33
WARNING
Improper installation, adjustment, alteration, service
or maintenance can cause property damage, personal
injury or loss of life. Installation and service must be
performed by a licensed professional installer (or
equivalent), service agency or the gas supplier.
Manufactured By
Allied Air Enterprises LLC
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
Save these instructions for future reference
507330-01 Issue 1721 Page 1 of 34
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
*P507330-01*
CAUTION
(P) 507330-01
Unit Dimensions
1
NOTE -C20 and D20 size units installed in upow
applications that require air volumes of 1800 cfm (850 L/s or
greater must have one of the following:
1. Single side return air with transition, to accommodate 20
x 25 x 1 in. (508 x 635 x 25 mm) air lter.
2. Single side return air with optional RAB Return Air Base
3. Bottom return air.
4. Return air from both sides.
5. Bottom and one side return air.
2
Flue outlet may be horizontal but furnace must be vented
vertically.
3
Optional external side return air lter kit cannot be used with
the optional RAB Return Air Base.
*
Consider sizing requirements for optional IAQ equipment before
cutting side return opening.
A80UH1E / 80G1UHE
Capacity
045-12
070-12
090-16
090-20
110-20 21 533 19-7/8 504 19-1/2 495 8 203
135-20 24-1/2 622 23-3/8 546 23 584 9-3/4 248
FRONT VIEW SIDE VIEW
A B C D
in. mm in. mm in. mm in. mm
14-1/2 368 13-3/8 340 13 330 4-3/4 121
17-1/2 446 16-3/8 416 16 406 6-1/4 159
507330-01Page 2 of 34 Issue 1721
A80UH1E & 80G1UHE Gas Furnace
The A80UH1E & 80G1UHE gas furnace is shipped ready
for installation in the upow or horizontal right position (for
horizontal left position the combustion air pressure switch
must be moved). The furnace is shipped with the bottom
panel in place. The bottom panel must be removed if the
unit is to be installed in horizontal or upow applications
with bottom return air.
The furnace is equipped for installation in natural gas
applications. A conversion kit (ordered separately) is
required for use in propane/LP gas applications.
Clearances
Adequate clearance must be made around the air openings
into the vestibule area. In order to ensure proper unit
operation, combustion and ventilation air supply must be
provided according to the current National Fuel Gas Code.
Vent installations must be consistent with the venting
tables (in this instruction) and applicable provisions of local
building codes.
This furnace is CSA International certied for installation
clearances to combustible material as listed on the unit
nameplate and in the tables in Figure 7 and Figure 11.
Accessibility and service clearances must take precedence
over re protection clearances.
Shipping and Packing List
1 - Assembled Gas Furnace
1 - Bag assembly containing the following:
2 - Screws
3 - Wire nuts
1 - Snap bushing
1 - Snap Plug
1 - Wire tie
1 - Vent warning label
1 - Owner’s manual and warranty card
Check equipment for shipping damage. If you nd any
damage, immediately contact the last carrier.
Please refer to specication sheets for available
accessories.
Safety Information
DANGER
DANGER OF EXPLOSION!
There are circumstances in which odorant used with
LP/Propane gas can lose its scent. In case of a leak,
LP/Propane gas will settle close to the oor and may be
difcult to smell. An LP/Propane leak detector should be
installed in all LP applications.
Installed Locations
For installation in a residential garage, the furnace must be
installed so that the burner(s) and the ignition source are
located no less than 18 inches (457 mm) above the oor.
The furnace must be located or protected to avoid physical
damage by vehicles. When a furnace is installed in a public
garage, hangar, or other building that has a hazardous
atmosphere, the furnace must be installed according to
recommended good practice requirements and current
National Fuel Gas Code.
Temperature Rise
NOTE: Furnace must be adjusted to obtain a temperature
rise within the range specied on the unit nameplate.
Failure to do so may cause erratic limit operation and may
result in premature heat exchanger failure.
This furnace must be installed so that its electrical
components are protected from water.
Installed in Combination with a Cooling Coil
When this furnace is used with cooling units, it shall be
installed in parallel with, or on the upstream side of, cooling
units to avoid condensation in the heating compartment.
See Figure 1. With a parallel ow arrangement, a damper
(or other means to control the ow of air) must adequately
pre vent chilled air from entering the furnace. If the damper
is manually operated, it must be equipped to prevent
operation of either the heating or the cooling unit, unless it
is in the full HEAT or COOL setting. See Figure 1.
Certications
These units are CSA International certied to ANSI Z21.47.
In the USA, installation of gas furnaces must conform with
local building codes. In the absence of local codes, units
must be installed according to the current National Fuel
Gas Code (ANSI-Z223.1). The National Fuel Gas Code is
available from the following address: American National
Standards Institute, Inc., 11 West 42nd Street, New York,
NY 10036.
507330-01 Issue 1721 Page 3 of 34
Heating Unit Installed Parallel to Air Handler Unit
Heating Unit Installed Upstream of Cooling Unit
Figure 1.
When installed, this furnace must be electrically grounded
according to local codes. In addition, in the United States,
installation must conform with the current National
Electric Code, ANSI/NFPA No. 70. The National Electric
Code (ANSI/NFPA No. 70) is available from the following
address:
National Fire Protection Association
1 Battery March Park
Quincy, MA 02269
NOTE: This furnace is designed for a minimum continuous
return air temperature of 60° F (16°C) or an intermittent
operation down to 55° F (13°C) dry bulb for cases where
a night setback thermostat is used. Return air temperature
must not exceed 85° F (29°C) dry bulb.
• A room thermostat must control the furnace. The use
of xed jumpers that will provide continuous heating is
not allowed.
• The return air duct must be provided and sealed to the
furnace.
• Return air temperature range between 60°F (16°C)
and 80°F (27°C) must be maintained.
• Air lters must be installed in the system and must be
maintained during construction.
• Air lters must be replaced upon construction
completion.
• The input rate and temperature rise must be set per
the furnace rating plate.
• One hundred percent (100%) outdoor air must be
provided for combustion air requirements during
construction. Temporary ducting may supply outdoor
air to the furnace. Do not connect duct directly to
the furnace. Size the temporary duct following these
instructions in section for Combustion, Dilution and
Ventilation Air in a conned space with air from outside.
• The furnace heat exchanger, components, duct
system, air lters and evaporator coils must be
thoroughly cleaned following nal construction cleanup.
• All furnace operating conditions (including ignition,
input rate, temperature rise and venting) must be
veried according to these installation instructions.
General
These instructions are intended as a general guide and do
not supersede local codes in any way. Consult authorities
having jurisdiction before installation.
This furnace may be installed in alcoves, closets, attics,
basements, garages, and utility rooms in the upow or
horizontal position.
This furnace design has not been CSA certied for
installation in mobile homes, recreational vehicles, or
outdoors.
Use of Furnace as a Construction Heater
Allied Air does not recommended the use of these units
as a construction heater during any phase of construction.
Very low return air temperature, harmful vapors and
operation of the unit with clogged or misplaced lters will
damage the unit.
Units may be used for heating of buildings or structures
under construction, if the following conditions are met:
• The vent system must be permanently installed per
these installation instructions.
In addition to the requirements outlined previously, the
following general recommendations must be considered
when installing one of these furnaces:
• Place the furnace as close to the center of the air
distribution system as possible. The furnace should
also be located close to the chimney or vent termination
point.
• Do not install the furnace where drafts might blow
directly into it. This could cause improper combustion.
• Do not block the furnace combustion air openings with
clothing, boxes, doors, etc. Air is needed for proper
combustion and safe unit operation.
• When the furnace is installed in an attic or other
insulated space, keep insulation away from the
furnace.
507330-01Page 4 of 34 Issue 1721
NOTE: The Commonwealth of Massachusetts stipulates
these additional requirements:
• Gas furnaces shall be installed by a licensed plumber
or tter only.
• The gas cock must be “T handle” type.
• When a furnace is installed in an attic, the passageway
to and service area surrounding the equipment shall
be oored.
WARNING
This product contains a chemical known to the State
of California to cause cancer, birth defects or other
reproductive harm.
Combustion, Dilution & Ventilation Air
In the past, there was no problem in bringing in sufcient
outdoor air for combustion. Inltration provided all the air
that was needed. In today’s homes, tight construction
practices make it necessary to bring in air from outside
for combustion. Take into account that exhaust fans,
appliance vents, chimneys, and replaces force additional
air that could be used for combustion out of the house.
Unless outside air is brought into the house for combustion,
negative pressure (outside pressure is greater than inside
pressure) will build to the point that a downdraft can occur
in the furnace vent pipe or chimney. As a result, combustion
gases enter the living space creating a potentially
dangerous situation.
WARNING
Insufcient combustion air can cause headaches,
nausea, dizziness or asphyxiation. It will also cause
excess water in the heat exchanger resulting in rusting
and premature heat exchanger failure. Excessive
exposure to contaminated combustion air will result
in safety and performance related problems. Avoid
exposure to the following substances in the combustion
air supply:
• Permanent wave solutions
• Chlorinated waxes and cleaners
• Chlorine base 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
• Antistatic fabric softeners for clothes dryers
• Masonry acid washing materials
In addition to providing combustion air, fresh outdoor air
dilutes contaminants in the indoor air. These contaminants
may include bleaches, adhesives, detergents, solvents
and other contaminants which can corrode furnace
components.
In the absence of local codes concerning air for combustion
and ventilation, use the guidelines and procedures in this
section to install these furnaces to ensure efcient and
safe operation. You must consider combustion air needs
and requirements for exhaust vents and gas piping.
A portion of this information has been reprinted
with permission from the National Fuel Gas Code
(ANSI-Z223.1). This reprinted material is not the complete
and ofcial position of the ANSI on the referenced subject,
which is represented only by the standard in its entirety.
All gas red appliances require air for the combustion
process. If sufcient combustion air is not available, the
furnace or other appliances will operate inefciently
and unsafely. Enough air must be provided to meet the
needs of all fuel burning appliances and appliances such
as exhaust fans which force air out of the house. When
replaces, exhaust fans, or clothes dryers are used at the
same time as the furnace, much more air is necessary to
ensure proper combustion and to prevent a downdraft.
Insufcient air causes incomplete combustion which can
result in carbon monoxide.
The requirements for providing air for combustion and
ventilation depend largely on whether the furnace is
installed in an unconned or a conned space.
Unconned Space
An unconned space is an area such as a basement
or large equipment room with a volume greater than 50
cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of
the combined input rating of all appliances installed in that
space. This space also includes adjacent rooms which are
not separated by a door. Though an area may appear to
be unconned, it might be necessary to bring in outdoor air
for combustion if the structure does not provide enough air
by inltration. If the furnace is located in a building of tight
construction with weather stripping and caulking around
the windows and doors, follow the procedures in the air
from outside section.
Conned Space
A conned space is an area with a volume less than 50
cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of
the combined input rating of all appliances installed in that
space. This denition includes furnace closets or small
equipment rooms.
507330-01 Issue 1721 Page 5 of 34
When the furnace is installed so that supply ducts carry
air circulated by the furnace to areas outside the space
containing the furnace, the return air must be handled by
ducts which are sealed to the furnace casing and which
terminate outside the space containing the furnace. This
is especially important when the furnace is mounted on
a platform in a conned space such as a closet or small
equipment room. Even a small leak around the base of the
unit at the platform or at the return air duct connection can
cause a potentially dangerous negative pressure condition.
Air for combustion and ventilation can be brought into the
conned space either from inside the building or from
outside.
outdoors or indirectly through vertical ducts. Each opening
shall have a minimum free area of 1 square inch (645 mm2)
per 4,000 Btu (1.17 kW) per hour of total input rating of all
equipment in the enclosure. See Figure 3 and Figure 4.
When communicating with the outdoors through horizontal
ducts, each opening shall have a minimum free area of 1
square inch (645 mm2) per 2,000 Btu (.56 kW) per total
input rating of all equipment in the enclosure. See Figure 5.
When ducts are used, they shall be of the same cross
sectional area as the free area of the openings to which
they connect. The minimum dimension of rectangular
air ducts shall be no less than 3 inches (75 mm). In
calculating free area, the blocking effect of louvers, grilles,
or screens must be considered. If the design and free area
of protective covering is not known for calculating the size
opening required, it may be assumed that wood louvers
will have 20 to 25 percent free area and metal louvers and
grilles will have 60 to 75 percent free area. Louvers and
grilles must be xed in the open position or interlocked
with the equipment so that they are opened automatically
during equipment operation.
NOTE: Each opening shall have a free area of at least one square
inch per 1,000 Btu (645 mm² per .29 kW) per hour of the total
input rating of all equipment in the enclosure, but not less than 100
square inches (64546 mm²).
Figure 2. Equipment in Conned Space - All Air From
Inside
Air from Inside
If the conned space that houses the furnace adjoins a
space categorized as unconned, air can be brought in
by providing two permanent openings between the two
spaces. Each opening must have a minimum free area of 1
square inch (645 mm2) per 1,000 Btu (.29 kW) per hour of
total input rating of all gas red equipment in the conned
space. Each opening must be at least 100 square inches
(64516 mm2). One opening shall be within 12 inches (305
mm) of the top of the enclosure and one opening within 12
inches (305 mm) of the bottom. See Figure 2.
Air from Outside
If air from outside is brought in for combustion and
ventilation, the conned space must have two permanent
openings. One opening shall be within 12 inches (305
mm) of the top of the enclosure and one opening within
12 inches (305 mm) of the bottom. These openings must
communicate directly or by ducts with the outdoors or
spaces (crawl or attic) that freely communicate with the
NOTE: The inlet and outlet air openings shall each have a free
area of at least one square inch per 4,000 Btu (645 mm² per
1.17 kW) per hour of the total input rating of all equipment in the
enclosure.
Figure 3. Equipment in Conned Space - All Air from
Outside
(Inlet Air from Crawl Space & Outlet Air to Ventilated
Attic)
507330-01Page 6 of 34 Issue 1721
NOTE: The inlet and outlet air openings shall each have a free
area of at least one square inch per 4,000 Btu (645 mm² per
1.17 kW) per hour of the total input rating of all equipment in the
enclosure.
Setting Equipment
WARNING
Do not install the furnace on its front or its back. Do not
connect the return air ducts to the back of the furnace.
Doing so will adversely affect the operation of the safety
control devices, which could result in personal injury or
death.
The gas furnace can be installed as shipped in either the
upow position or the horizontal position.
Select a location that allows for the required clearances
that are listed on the unit nameplate. Also consider gas
supply connections, electrical supply, vent connection, and
installation and service clearances [24 inches (610 mm) at
unit front]. The unit must be level.
Figure 4. Equipment in Conned Space - All Air from
Outside
(All Air through Ventilated Attic)
NOTE: Each air duct opening shall have a free area of at least one
square inch per 2,000 Btu (645 mm² per .59 kW) per hour of the
total input rating of all equipment in the enclosure. If the equipment
room is located against an outside wall and the air openings
communicate directly with the outdoors, each opening shall have
a free area of at least 1 square inch per 4,000 Btu (645 mm² per
1.17 kW) per hour of the total input rating of all other equipment in
the enclosure.
NOTE: Units with 1/2 hp and 3/4 hp blower motors are
equipped with three exible legs and one rigid leg. See
Figure 6. The rigid leg is equipped with a shipping bolt and
a at white plastic washer (rather than the rubber mounting
grommet used with a exible mounting leg). The bolt and
washer must be removed before the furnace is placed into
operation. After the bolt and washer have been removed,
the rigid leg will not touch the blower housing.
Units with 1/2 HP & 3/4 HP
Blower Motor.
Figure 6.
Figure 5. Equipment in Conned Space - All Air from
Outside
507330-01 Issue 1721 Page 7 of 34
Upow Applications
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or
alcove installations are shown in Figure 7.
2. Single side return air with optional return airbase. See
Figure 12.
3. Bottom return air.
4. Return air from both sides.
5. Bottom and one side return air.
Type of Vent
Connector
Top 1 in. (25 mm) 1 in. (25 mm)
*Front 2-1/4 in. (57 mm) 2-1/4 in. (57 mm)
Back 0 0
Sides 0† 0
Vent 6 in. (152 mm) 1 in. (25 mm)
Floor 0‡ 0‡
* Front clearance in alcove installation must be 24 in. (610
mm). Maintain a minimum of 24 in. (610 mm) for front service
access.
‡ For installation on a combustible oor, do not install the
furnace directly on carpeting, tile or other combustible
materials other than wood ooring.
† Left side requires 3 in. if a single wall vent is used on 14-1/2
in. cabinets.
Type C Type B
1
Figure 7. Upow Application Installation Clearances
Return Air - Upow Applications
Return air can be brought in through the bottom or either
side of the furnace installed in an upow application. If the
furnace is installed on a platform with bottom return, make
an airtight seal between the bottom of the furnace and the
platform to ensure that the furnace operates properly and
safely. The furnace is equipped with a removable bottom
panel to facilitate installation.
Markings are provided on both sides of the furnace cabinet
for installations that require side return air. Cut the furnace
cabinet at the maximum dimensions shown on Page 2.
NOTE: 20C and 20D units that require air volumes over
1800 cfm (850 L/s) must have one of the following:
Figure 8. Single Side Return Air
(with transition and lter)
Removing the Bottom Panel
Remove the two screws that secure the bottom cap to the
furnace. Pivot the bottom cap down to release the bottom
panel. Once the bottom panel has been removed, reinstall
the bottom cap. See Figure 9.
Figure 9. Removing the Bottom Panel
Horizontal Applications
The furnace can be installed in horizontal applications.
Order horizontal suspension kit (51W10) from Allied Air, or
use equivalent suspension method.
1. Single side return air with transition to accommodate
20 x 25 x 1 in. (508 x 635 x 25 mm) cleanable air lter.
(Required to maintain proper air velocity.) See Figure
8.
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or
alcove installations are shown in Figure 11.
507330-01Page 8 of 34 Issue 1721
This furnace may be installed in either an attic or a crawl
space. Either suspend the furnace from roof rafters or oor
joists, as shown in Figure 10, or install the furnace on a
platform, as shown in Figure 13.
Figure 10. Typical Horizontal Application
Unit Suspended in Attic or Crawl Space
Type of Vent
Connector
Type C Type B
1
Top 0 0
*Front 2-1/4 in. (57 mm) 2-1/4 in. (57 mm)
Back 0 0
Ends 2 in. (51 mm) 2 in. (51 mm)
Vent 6 in. (152 mm) 1 in. (25 mm)
Floor 0‡ 0‡
* Front clearance in alcove installation must be 24 in. (610
mm). Maintain a minimum of 24 in. (610 mm) for front service
access.
‡ For installation on a combustible oor, do not install the
furnace directly on carpeting, tile or other combustible
materials other than wood ooring.
Figure 11. Horizontal Application Installation
Clearances
FRONT VIEW
NOTE: Optional Side Return Air Filter Kits are not for use with Return Air Base.
1
Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.
Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in. (584 x 279 mm).
The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown.
Side return air openings must be cut in the eld. There are cutting guides stenciled on the cabinet for the side return air opening.
The size of the opening must not extend beyond the markings on the furnace cabinet.
² To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.
SIDE VIEW
Figure 12. Optional Return Air Base
(Upow Applications Only - For Use with A, B, C and D Cabinets)
507330-01 Issue 1721 Page 9 of 34
NOTE: Heavy gauge perforated sheet metal straps may
be used to suspend the unit from roof rafters or ceiling
joists. When straps are used to suspend the unit in this
way, support must be provided for both the ends. The
straps must not interfere with the plenum or exhaust
piping installation. Cooling coils and supply and return air
plenums must be supported separately.
NOTE: When the furnace is installed on a platform in a
crawlspace, it must be elevated enough to avoid water
damage and to allow the evaporator coil to drain.
WARNING
The inner blower panel must be securely in place when
the blower and burners are operating. Gas fumes,
which could contain carbon monoxide, can be drawn
into living space resulting in personal injury or death.
Filters
Return Air - Horizontal Applications
Return air must be brought in through the end of a furnace
installed in a horizontal application. The furnace is equipped
with a removable bottom panel to facilitate installation. See
Figure 9.
Figure 13. Horizontal Application
Unit Installed on Platform
This unit is not equipped with a lter or rack. A eld provided
high velocity lter is required for the unit to operate properly.
Table 1 lists recommended lter sizes.
A lter must be in place any time the unit is operating.
Furnace Cabinet
Width
A - 14-1/2”
B - 17-1/2” 16 x 25 x 1
C - 21” 20 x 25 x 1
D - 24-1/2” 24 x 25 x 1
Side Return Bottom Return
16 x 25 x 1
Filter Size
14 x 25 x 1
Table 1.
Duct System
Use industry approved standards (such as those published
by Air Conditioning Contractors of America or American
Society of Heating, Refrigerating and Air Conditioning
Engineers) to size and install the supply and return air duct
system. This will result in a quiet and low static system that
has uniform air distribution.
WARNING
Improper installation of the furnace can result in
personal injury or death. Combustion and ue products
must never be allowed to enter the return air system or
the living space. Use screws and joint tape to seal the
return air system to the furnace.
In platform installations with bottom return air, the furnace
should be sealed airtight to the return air plenum. A door
must never be used as a portion of the return air duct
system. The base must provide a stable support and an
airtight seal to the furnace. Allow absolutely no sagging,
cracks, gaps, etc..
The return and supply air duct systems must never
be connected to or from other heating devices such
as a replace or stove, etc.. Fire, explosion, carbon
monoxide poisoning, personal injury and/or property
damage could result.
NOTE: Do not operate the furnace in the heating mode
with an external static pressure that exceeds 0.8 inches
w.c. Higher external static pressures may cause erratic
limit operation.
Supply Air Plenum
If the furnace is installed without a cooling coil, a removable
access panel must be installed in the supply air duct. The
access panel should be large enough to permit inspection
(either by smoke or reected light) of the heat exchanger
for leaks after the furnace is installed. The furnace access
panel must always be in place when the furnace is operating
and it must not allow leaks into the supply air duct system.
Return Air Plenum
NOTE: Return air must not be drawn from a room where
this furnace, or any other gas fueled appliance (i.e., water
heater), or carbon monoxide producing device (i.e., wood
replace) is installed.
507330-01Page 10 of 34 Issue 1721
When return air is drawn from a room, a negative pressure
is created in the room. If a gas appliance is operating in
a room with negative pressure, the ue products can be
pulled back down the vent pipe and into the room. This
reverse ow of the ue gas may result in incomplete
combustion and the formation of carbon monoxide gas.
This toxic gas might then be distributed throughout the
house by the furnace duct system.
In upow applications, the return air can be brought
in through the bottom or either side of the furnace. If a
furnace with bottom return air is installed on a platform,
make an airtight seal between the bottom of the furnace
and the platform to ensure that the unit operates properly
and safely. Use berglass sealing strips, caulking, or
equivalent sealing method between the plenum and the
furnace cabinet to ensure a tight seal. If a lter is installed,
size the return air duct to t the lter frame.
Venting
A 4 inch diameter ue transition is factory installed on
the combustion air inducer outlet of all models. Figure 15
shows the combustion air inducer as shipped from the
factory.
IMPORTANT
The unit will not vent properly with the ue transition
pointed down in the 6 o’clock position.
The combustion air inducer may be rotated clockwise
or counterclockwise by 90° to allow for top or side vent
discharge in all applications. When the unit is installed,
the ue transition must be in the 9 o’clock, 12 o’clock or
3 o’clock position.
If necessary reposition the combustion air inducer,
pressure switch and/or make-up box as needed per the
following steps. See Figure 15 through Figure 21.
1. Remove the four mounting screws (Figure 14) which
secure the combustion air inducer / pressure switch
assembly to the orice plate. Lift the assembly and
rotate it 90° clockwise or counter clockwise to either
the 3 o’clock position. Resecure with four screws.
Gasket should be left in place.
2. Use tin snips to cut preferred opening on the cabinet
for repositioning the ue outlet. Use the cut-out piece
as a cover plate to patch unused opening on cabinet.
Figure 14. Mounting Screws Location
• Gas supply piping must be brought into the unit from the right side
in order to accommodate the ue pipe.
• Cut combustion air inducer tubing from 9” to 8” to avoid
interference with inducer motor.
• Remove make-up box assembly (2 screws) and cut wire tie to
free make-up box wires. Re install make-up box on other side of
cabinet.
• Resecure make-up box wires: Either pull excess wires through
the blower compartment and secure using supplied wire tie, or
coil excess wire and secure to the gas manifold.
Figure 16. Upow Position
Left Side Vent Discharge
Figure 15. Upow Position
Top Vent Discharge
507330-01 Issue 1721 Page 11 of 34
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