Royalton B2332509, B2332516, B2332515, B2332514, B2332510 User Manual

INSTALLATION INSTRUCTIONS

A80UH1E & 80G1UHE

Warm Air Gas Furnace

Upow / 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 upow

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 upow 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 upow 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 certied 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 specication 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
difcult 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 specied 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.

Certications

These units are CSA International certied 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 conned 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
veried 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 upow or
horizontal position.

This furnace design has not been CSA certied 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 sufcient
outdoor air for combustion. Inltration 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

Insufcient 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 efcient 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 ofcial 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 sufcient combustion air is not available, the
furnace or other appliances will operate inefciently
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.
Insufcient 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 unconned or a conned space.

Unconned Space

An unconned 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 unconned, it might be necessary to bring in outdoor air
for combustion if the structure does not provide enough air
by inltration. 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.

Conned Space

A conned 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 denition 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 conned 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
conned 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 Conned Space - All Air From

Inside

Air from Inside

If the conned space that houses the furnace adjoins a
space categorized as unconned, 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 conned
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 conned 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 Conned 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
upow 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 Conned 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 Conned Space - All Air from

Outside

507330-01 Issue 1721 Page 7 of 34

Upow 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. Upow Application Installation Clearances

Return Air - Upow Applications

Return air can be brought in through the bottom or either
side of the furnace installed in an upow 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

(Upow 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 reected 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 upow 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 orice 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. Upow Position

Left Side Vent Discharge

Figure 15. Upow Position

Top Vent Discharge

507330-01 Issue 1721 Page 11 of 34

• Cut combustion air inducer tubing from 9” to 5” to avoid

interference with inducer motor.

Figure 17. Upow Position
Right Side Vent Discharge

• Disconnect pressure switch hose from barbed tting on the
pressure switch assembly. Remove pressure switch assembly
(1 screw) and cut wire tie to free pressure switch wires. Reinstall
pressure switch on the other side of orice plate and reconnect
pressure switch hose.

• Resecure pressure switch 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 18. Horizontal Left Position

Top Vent Discharge

• Cut combustion air inducer tubing from 9” to 7” to avoid
interference with inducer motor.

• Disconnect pressure switch hose from barbed tting on the
pressure switch assembly. Remove pressure switch assembly
(1 screw) and cut wire tie to free pressure switch wires. Reinstall
pressure switch on the other side of orice plate and reconnect
pressure switch hose.

• Resecure pressure switch 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 19. Horizontal Left Position

Side Vent Discharge

• Gas supply piping must be brought into the unit from the bottom
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. Reinstall 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 20. Horizontal Right Position

Top Vent Discharge

507330-01Page 12 of 34 Issue 1721

Figure 21. Horizontal Right Position

Side Vent Discharge

These series units are classied as fan assisted Category
I furnaces when vertically vented according to the latest
edition of National Fuel Gas Code (NFPA 54 / ANSI
Z223.1) in the USA. A fan assisted Category I furnace is
an appliance equipped with an integral mechanical means
to either draw or force combustion products through the
combustion chamber and/or heat exchanger. This unit is
not approved for use with horizontal venting.

NOTE: Use these instructions as a guide. They do not
supersede local codes. This furnace must be vented
according to all local codes these installation instructions,
and the provided venting tables in these instructions.

WARNING

Asphyxiation hazard. The exhaust vent for this furnace
must be securely connected to the furnace ue transition
at all times.

Figure 22. Vent Connection

Use self drilling sheet metal screws or a mechanical
fastener to rmly secure the vent pipe to the round collar of
the ue transition. If self drilling screws are used to attach
the vent pipe, it is recommended that three be used. Drive
one self drilling screw through the front and one through
each side of the vent pipe and collar. See Figure 22.

Install the rst vent connector elbow at a minimum of six
inches (152 mm) from the furnace vent outlet. See Figure

22.

The venting tables in this manual were extracted from the
National Fuel Gas Code (NFPA 54 / ANSI Z223.1) and are
provided as a guide for proper vent installation. Proper
application, termination, construction and location of vents
must conform to local codes having jurisdiction. In the
absence of local codes, the NFGC serves as the dening
document.

Refer to the tables and the venting information contained
in these instructions to properly size and install the venting
system.

IMPORTANT

Once the venting system is installed, attach the
“Disconnected Vent” warning sticker to a visible area
of the plenum near the vent pipe. See Figure 22. The
warning sticker is provided in the bag assembly. Order
kit 66W04 for additional stickers.

Venting Using a Masonry Chimney

The following additional requirements apply when a lined
masonry chimney is used to vent this furnace.

Masonry chimneys used to vent Category I central furnaces
must be either tile lined or lined with a listed metal lining
system or dedicated gas vent. Unlined masonry chimneys
are prohibited. See Figure 23 and Figure 24 for common
venting.

A chimney with one or more sides exposed to the outside
of the structure is considered to be an exterior chimney.

An exterior masonry chimney that is not tile lined must be
lined with B1 vent or a listed insulated exible metal vent.
An exterior tile lined chimney that is sealed and capped
may be lined with a listed uninsulated exible metal vent.

If the existing chimney will not accommodate a listed metal
liner, either the chimney must be rebuilt to accommodate
one of these liners or an alternate approved venting
method must be found.

Insulation for the exible vent pipe must be an encapsulated
berglass sleeve recommended by the exible vent pipe
manufacturer.

507330-01 Issue 1721 Page 13 of 34

NOTE 1: Refer to the provided venting tables for installations.
Refer to the capacity requirements shown in the provided venting
tables.

Figure 23. Common Venting Using Metal-Lined

Masonry Chimney

A fan assisted furnace may be commonly vented into an
existing lined masonry chimney if the following conditions
are met:

• The chimney is currently serving at least one drafthood
equipped appliance.

• The vent connectors and chimney are sized according
to the provided venting tables.

If type B1 double wall vent is used inside a chimney, no
other appliance can be vented into the chimney. The outer
wall of type B1 vent pipe must not be exposed to ue
products. A type B1 vent or masonry chimney liner shall
terminate above the roof surface with a listed cap or a listed
roof assembly according to the terms of their respective
listings and the vent manufacturer’s instructions.

When inspection reveals that an existing chimney is not
safe for the intended purpose, it shall be rebuilt to conform
to nationally recognized standards, lined or relined with
suitable materials, or replaced with a gas vent or chimney
suitable for venting. The chimney passageway must be
checked periodically to ensure that it is clear and free of
obstructions.

DO NOT insulate the space between the liner and the
chimney wall with puffed mica or any other loose granular
insulating material.

IMPORTANT

SINGLE appliance venting of a fan assisted furnace into
a tile lined masonry chimney (interior or outside wall) is
prohibited. The chimney must rst be lined with either
type B1 vent or an insulated single wall exible vent
lining system which has been sized according to the
provided venting tables and the vent pipe manufacturer’s
instructions.

NOTE: Refer to provided
venting tables for
installations.

Do not install a manual damper, barometric draft regulator,
or ue restrictor between the furnace and the chimney.

Never connect a Category I appliance to a chimney that is
servicing a solid fuel appliance. If a replace chimney ue
is used to vent this appliance, the replace opening must
be permanently sealed.

A type B1 or listed chimney lining system that passes
through an unused masonry chimney ue is not considered
to be exposed to the outdoors.

General Venting Requirements

Vent all furnaces according to these instructions:

NOTE: The chimney must be properly
sized per provided venting tables or lined
with listed metal lining system.

Figure 24. Common Venting Using Tile Lined Interior Masonry Chimney and Combined Vent Connector

507330-01Page 14 of 34 Issue 1721

1. Vent diameter recommendations and maximum
allowable piping runs are found in the provided venting
tables.

2. In no case should the vent or vent connector diameter
be less than the diameter specied in the provided
venting tables.

3. The minimum vent capacity determined by the sizing
tables must be less than the low re input rating and
the maximum vent capacity must be greater than the
high re input rating.

4. Single appliance vents - If the vertical vent or tile
lined chimney has a larger diameter or ow area than
the vent connector, use the vertical vent diameter to
determine the minimum vent capacity and the vent
connector diameter to determine the maximum vent
capacity. The ow area of the vertical vent, however,
shall not exceed 7 times the ow area of the listed
appliance categorized vent area, drafthood outlet
area or ue collar area unless designed according to
approved engineering methods.

5. Multiple appliance vents - The ow area of the largest
section of vertical vent or chimney shall not exceed 7
times the smallest listed appliance categorized vent
area, drafthood outlet area or ue collar area unless
designed according to approved engineering methods.

6. The entire length of single wall metal vent connector
shall be readily accessible for inspection, cleaning,
and replacement.

7. Single appliance venting congurations with zero lateral
lengths (Table 3) are assumed to have no elbows in
the vent system. For all other vent congurations, the
vent system is assumed to have two 90° elbows. For
each additional 90° elbow or equivalent (for example
two 45° elbows equal one 90° elbow) beyond two, the
maximum capacity listed in the venting table should
be reduced by 10% (0.90 x maximum listed capacity).

8. The common venting tables (Table 4 and Table 5) were
generated using a maximum horizontal vent connector
length of 1-1/2 feet (.46 m) for each inch (25 mm) of
connector diameter as follows:

Connector Diameter

in. (mm)

3 (76) 4-1/2 (1.37)

4 (102) 6 (1.83)

5 (127) 7-1/2 (2.29)

6 (152) 9 (2.74)

7 (178) 10-1/2 (3.20)

Maximum Horizontal

Connector Length

ft. (m)

Table 2.

9. If the common vertical vent is offset, the maximum
common vent capacity listed in the common venting
tables should be reduced by 20%, the equivalent
of two 90° elbows (0.80 x maximum common vent

capacity). The horizontal length of the offset shall not
exceed 1-1/2 feet (.46 m) for each inch (25 mm) of
common vent diameter.

10. The vent pipe should be as short as possible with
the least number of elbows and angles required to
complete the job. Route the vent connector to the vent
using the shortest possible route.

11. A vent connector shall be supported without any dips
or sags and shall slope a minimum of 1/4 inch (6.4
mm) per linear foot (305 mm) of connector, back
toward the appliance.

12. Vent connectors shall be rmly attached to the furnace
ue collar by self drilling screws or other approved
means,except vent connectors of listed type B vent
material which shall be assembled according to the
manufacturer’s instructions. Joints between sections
of single wall connector piping shall be fastened by
screws or other approved means.

13. When the vent connector used for Category I
appliances must be located in or pass through a crawl
space, attic or other areas which may be cold, that
portion of the vent connector shall be constructed
of listed double wall type B vent material or material
having equivalent insulation qualities.

14. All venting pipe passing through oors, walls, and
ceilings must be installed with the listed clearance to
combustible materials and be re stopped according
to local codes. In absence of local codes, refer to
NFGC (2223.1 ).

15. No portion of the venting system can extend into, or
pass through any circulation air duct or plenum.

16. Vent connectors serving Category I appliances shall
not be connected to any portion of mechanical draft
systems operating under positive pressure such as
Category III or IV venting systems.

17. If vent connectors are combined prior to entering the
common vent, the maximum common vent capacity
listed in the common venting tables must be reduced
by 10%, the equivalent of one 90° elbow (0.90 x
maximum common vent capacity).

18. The common vent diameter must always be at least as
large as the largest vent connector diameter.

19. In no case, shall the vent connector be sized more
than two consecutive table size diameters over the
size of the draft hood outlet or ue collar outlet.

20. Do not install a manual damper, barometric draft
regulator or ue restrictor between the furnace and
the chimney.

21. When connecting this appliance to an existing
dedicated or common venting system, you must
inspect the venting system’s general condition and
look for signs of corrosion. The existing vent pipe size
must conform to these instructions and the provided
venting tables. If the existing venting system does not
meet these requirements, it must be resized.

507330-01 Issue 1721 Page 15 of 34

Capacity of Type B Double Wall Vents with Type B Double Wall Connectors Serving a Single Category I Appliance

Vent and Connector Diameter - D (inches)

Height

H

(feet)

6

8

10

15

20

30

NOTE: Single appliance venting congurations with zero lateral lengths are assumed to have no elbows in the vent system. For
all other vent congurations, the vent system is assumed to have two 90 ° elbows. For each additional 90° elbow or equivalent (for
example two 45° elbows equal one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10
percent (0.90 x maximum listed capacity).

Lateral

L

(feet)

0 0 78 0 152 0 251 0 375

2 13 51 18 97 27 157 32 232

4 21 49 30 94 39 153 50 227

6 25 46 36 91 47 149 59 223

0 0 84 0 165 0 276 0 415

2 12 57 16 109 25 178 28 263

5 23 53 32 103 42 171 53 255

8 28 49 39 98 51 164 64 247

0 0 88 0 175 0 295 0 447

2 12 61 17 118 23 194 26 289

5 23 57 32 113 41 187 52 280

10 30 51 41 104 54 176 67 267

0 0 94 0 191 0 327 0 502

2 11 69 15 136 20 226 22 339

5 22 65 30 130 39 219 49 330

10 29 59 40 121 51 206 64 315

15 35 53 48 112 61 195 76 301

0 0 97 0 202 0 349 0 540

2 10 75 14 149 18 250 20 377

5 21 71 29 143 38 242 47 367

10 28 64 38 133 50 229 62 351

15 34 58 46 124 59 217 73 337

20 48 52 55 116 69 206 84 322

0 0 100 0 213 0 374 0 587

2 9 81 13 166 14 283 18 432

5 21 77 28 160 36 275 45 421

10 27 70 37 150 48 262 59 405

15 33 64 44 141 57 249 70 389

20 56 58 53 132 66 237 80 374

30 NR NR 73 11 3 88 214 104 346

3 inch 4 inch 5 inch 6 inch

Appliance Input Rating in Thousands of Btu per Hour

MIN MAX MIN MAX MIN MAX MIN MAX

Table 3.

507330-01Page 16 of 34 Issue 1721

Vent

Height

H

(feet)

6

8

10

15

20

30

Vent Connector Capacity

Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances

Connector

Rise

R

(feet)

1 22 37 35 66 46 106 58 164

2 23 41 37 75 48 121 60 183

3 24 44 38 81 49 132 62 199

1 22 40 35 72 49 114 64 176

2 23 44 36 80 51 128 66 195

3 24 47 37 67 53 139 67 210

1 22 43 34 78 49 123 65 189

2 23 47 36 86 51 136 67 206

3 24 50 37 92 52 146 69 220

1 21 50 33 89 47 142 64 220

2 22 53 35 96 49 153 66 235

3 24 55 36 102 51 163 68 248

1 21 54 33 99 46 157 62 246

2 22 57 34 105 48 167 64 259

3 23 60 35 110 50 176 66 271

1 20 62 31 113 45 181 60 288

2 21 64 33 118 47 190 62 299

3 22 66 34 123 48 198 64 309

3 inch 4 inch 5 inch 6 inch

MIN MAX MIN MAX MIN MAX MIN MAX

Vent and Connector Diameter - D (inches)

Appliance Input Rating in Thousands of Btu per Hour

Table 4.

Common Vent Capacity

Type B Double Wall Vents with Type B Double Wall Connectors Serving Two or More Category I Appliances

Common Vent Diameter - D (inches)

Vent Height

H

(feet)

FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT

6 92 81 140 116 204 161 309 248

8 101 90 155 129 224 178 339 275

10 110 97 169 141 243 194 367 299

15 125 112 195 164 283 228 427 352

20 136 123 215 183 314 255 475 394

30 152 138 244 210 361 297 547 459

4 inch 5 inch 6 inch 7 inch

Appliance Input Rating in Thousands of Btu per Hour

Table 5.

507330-01 Issue 1721 Page 17 of 34

Removal of the Furnace from Common Vent

In the event that an existing furnace is removed from
a venting system commonly run with separate gas
appliances, the venting system is likely to be too large to
properly vent the remaining attached appliances.

Conduct the following test while each appliance is operating
and the other appliances (which are not operating) remain
connected to the common venting system. If the venting
system has been installed improperly, you must correct the
system as indicated in the general venting requirements
section.

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.

4. Follow the lighting instructions. Turn on the appliance
that is being inspected. Adjust the thermostat so that
the appliance operates continuously.

5. After the burners have operated for 5 minutes, test for
leaks of ue gases at the draft hood relief opening.
Use the ame of a match or candle.

6. After determining that each appliance connected to
the common venting system is venting properly, (step

3) return all doors, windows, exhaust fans, replace
dampers, and any other gas burning appliances to
their previous mode of operation.

7. If a venting problem is found during any of the
preceding tests, the common venting system must be
modied to correct the problem.

Resize the common venting system to the minimum vent
pipe size determined by using the appropriate tables in
Appendix G. (These are in the current standards of the
National Fuel Gas Code ANSI 2223.1.

The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:

1. Seal any unused openings in the common venting
system.

2. Inspect the venting system for proper size and
horizontal pitch. Determine that there is no blockage,
restriction, leakage, corrosion, or other deciencies
which could cause an unsafe condition.

3. Close all building doors and windows and all doors
between the space in which the appliances remaining
connected to the common venting system are located
and other spaces of the building. Turn on clothes
dryers and any appliances not connected to the
common venting system. Turn on any exhaust fans,
such as range hoods and bathroom exhausts, so they
will operate at maximum speed. Do not operate a
summer exhaust fan. Close replace dampers.

Gas Piping

CAUTION

If a exible gas connector is required or allowed by
the authority that has jurisdiction, black iron pipe shall
be installed at the gas valve and extend outside the
furnace cabinet. The exible connector can then be
added between the black iron pipe and the gas supply
line.

Gas Supply

1. This unit is shipped standard for left or right side
installation of gas piping (or top entry in horizontal
applications). Connect the gas supply to the piping
assembly.

2. When connecting the gas supply piping, consider
factors such as length of run, number of ttings, and
furnace rating to avoid excessive pressure drop. Table
6 lists recommended pipe sizes for typical applications.

NOTE: BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET

Figure 25. Possible Gas Piping Congurations - Upow Applications

507330-01Page 18 of 34 Issue 1721

Nominal Iron

Pipe Size -

inches (mm)

1/2

(12.7)

Internal

Diameter

- inches

(mm)

.622

(17.799)

10

(3.048)

175

(4.96)

Gas Pipe Capacity - FT³/HR (kL/HR)

Length of Pipe - feet (m)

20

(6.096)

120

(3.40)

30

(9.144)

97

(2.75)

40

(12.192)

82

(2.32)

50

(15.240)

73

(2.07)

60

(18.288)

66

(1.87)

70

(21.336)

61

(1.73)

80

(24.384)

57

(1.61)

90

(27.432)

53

(1.50)

100

(30.480)

50

(1.42)

3/4

(19.05)

1

(25.4)

1-1/4

(31.75)

1-1/2

(38.1)

2

(50.8)

2-1/2

(63.5)

3

(76.2)

4

(101.6)

NOTE: Capacity given in cubic feet of gas per hour (kilo liters of gas per hour) and based on 0.60 specic gravity gas.

.824

(20.930)

1.049

(26.645)

1.380

(35.052)

1.610

(40.894)

2.067

(52.502)

2.469

(67.713)

3.068

(77.927)

4.026

(102.260)

360

(10.19)

680

(19.25)

1400

(39.64)

2100

(59.46)

3950

(111.85)

6300

(178.39)

11000

(311.48)

23000

(651.27)

250

(7.08)

465

(13.17)

950

(26.90)

460

(41.34)

2750

(77.87)

4350

(123.17)

7700

(218.03)

15800

(447.39)

200

(5.66)

375

(10.62)

770

(21.80)

1180

(33.41)

2200

(62.30)

3520

(99.67)

6250

(176.98)

12800

(362.44)

170

(4.81)

320

(9.06)

660

(18.69)

990

(28.03)

1900

(53.80)

3000

(84.95)

5300

(150.07)

10900

(308.64)

151

(4.28)

285

(8.07)

580

(16.42)

900

(25.48)

1680

(47.57)

2650

(75.04)

4750

(134.50)

9700

(274.67)

138

(3.91)

260

(7.36)

530

(15.01)

810

(22.94)

1520

(43.04)

2400

(67.96)

4300

(121.76)

9700

(274.67)

125

(3.54)

240

(6.80)

490

(13.87)

750

(21.24)

1400

(39.64)

2250

(63.71)

3900

(110.43)

8100

(229.36)

118

(3.34)

220

(6.23)

460

(13.03)

690

(19.54)

1300

(36.81)

2050

(58.05)

3700

(104.77)

7500

(212.37)

(12.18)

(18.41)

(34.55)

(55.22)

(97.69)

(203.88)

Table 6.

110

(3.11)

205

(5.80)

430

650

1220

1950

3450

7200

103

(2.92)

195

(5.52)

400

(11.33)

620

(17.56)

1150

(32.56)

1850

(52.38)

3250

(92.03)

6700

(189.72)

NOTE: BLACK IRON PIPE ONLY TO BE ROUTED INSIDE OF CABINET

Figure 26. Possible Gas Piping Congurations - Horizontal Applications

507330-01 Issue 1721 Page 19 of 34

3. The gas piping must not run in or through air ducts,
clothes chutes, gas vents or chimneys, dumb waiters,
or elevator shafts.

4. The piping should be sloped 1/4 inch (6.4 mm) per
15 feet (4.57 m) upward toward the meter from the
furnace. The piping must be supported at proper
intervals [every 8 to 10 feet (2.44 to 3.01 m)] with
suitable hangers or straps. Install a drip leg in vertical
pipe runs to the unit.

5. A 1/8” N.P.T. plugged tap or pressure post is located
on the gas valve to facilitate test gauge connection.
See Figure 27.

6. In some localities, codes may require the installation
of a manual main shut off valve and union (furnished
by the installer) external to the unit. The union must be
of the ground joint type.

IMPORTANT

Compounds used on threaded joints of gas piping must
be resistant to the actions of liquied petroleum gases.

NOTE: If emergency shutoff is necessary, shut off the
main manual gas valve and disconnect main power to the
furnace. The installer should properly label these devices.

Leak Check

After gas piping is completed, carefully check all piping
connections (factory and eld installed) for gas leaks. Use
a leak detecting solution or other preferred means.

NOTE: If emergency shutoff is necessary, shut off the main
manual gas valve and disconnect the main power to the
furnace. The installer should properly label these devices.

Figure 27.

Electrical

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

CAUTION

Electrostatic discharge can affect electronic components.
Take precautions during furnace installation and service
to protect the furnace’s electronic controls. Precautions
will help to avoid control exposure to electrostatic
discharge by putting the furnace, the control and the
technician at the same electrostatic potential. Neutralize
electrostatic charge by touching hand and all tools on
an unpainted unit surface, such as the gas valve or
blower deck, before performing any service procedure.

The unit is equipped with a eld make-up box on the left
hand side of the cabinet. The make-up box may be moved
to the right side of the furnace to facilitate installation. If
the make-up box is moved to the right side, clip the wire
ties that bundle the wires together. The excess wire must
be pulled into the blower compartment. Secure the excess
wire to the existing harness to protect it from damage.

CAUTION

Some soaps used for leak detection are corrosive to
certain metals. Carefully rinse piping thoroughly after
leak test has been completed. Do not use matches,
candles, ame or other sources of ignition to check for
gas leaks.

The furnace must be isolated by closing its individual
manual shut-off valve and disconnecting from the gas
supply system the during any pressure testing of the gas
supply system at pressures less than or equal to 1/2 psig
(3.48 kPa, 14 inches w.c.).

IMPORTANT

When testing pressure of gas lines, gas valve must be
disconnected and isolated. See Figure 27. Gas valves
can be damaged if subjected to pressures greater than
1/2 psig (3.48 kPa, 14 inches w.c.).

Refer to Figure 31 for schematic wiring diagram and
troubleshooting.

The power supply wiring must meet Class I restrictions.
Protected by either a fuse or circuit breaker, select circuit
protection and wire size according to unit nameplate.

Figure 28. Interior Make-Up Box Installation

507330-01Page 20 of 34 Issue 1721

Figure 29. Interior Make-Up Box Installation

NOTE: Unit nameplate states maximum current draw.

Maximum over current protection allowed is 15 AMP.

Holes are on both sides of the furnace cabinet to facilitate
wiring.

Install a separate (properly sized) disconnect switch near
the furnace so that power can be turned off for servicing.

Before connecting the thermostat, check to make sure the
wires will be long enough for servicing at a later date. Make
sure that thermostat wire is long enough to facilitate future
removal of blower for service.

Complete the wiring connections to the equipment. Use
the provided unit wiring diagram shown in Figure 31. Use
18 gauge wire or larger that is suitable for Class II rating for
thermostat connections.

Electrically ground the unit according to local codes or,
in the absence of local codes, according to the current
National Electric Code (ANSI/NFPA No. 70). A green
ground wire is provided in the eld make-up box.

connected to this terminal with the neutral leg of the circuit
being connected to one of the provided neutral terminals. If
a humidier rated at greater than one amp is connected to
this terminal, it is necessary to use an external relay.

One 24V “H” 1/4” spade terminal is provided on the furnace
control board. Any humidier rated up to 0.5 amp can be
connected to this terminal with the ground leg of the circuit
connected to ground or the “C” terminal. See Figure 32
for control board conguration. This terminal is energized
in the heating mode when the combustion air inducer is
operating.

Generator Use - Voltage Requirements

The following requirements must be kept in mind when
specifying a generator for use with this equipment:

• The furnace requires 120 volts ± 10% (Range: 108
volts to 132 volts).

• The furnace operates at 60 Hz ± 5% (Range: 57 Hz
to 63 Hz).

• The furnace integrated control requires both polarity
and proper ground. Both polarity and proper grounding
should be checked before attempting to operate the
furnace on either permanent or temporary power.

• Generator should have a wave form distortion of less
than 5% RHO.

Thermostat

Install the room thermostat according to the instructions
provided with the thermostat. See Figure 30 for thermostat
designations. If the furnace is being matched with a
heat pump, refer to the FM21 installation instruction or
appropriate dual fuel thermostat instructions.

NOTE: This furnace contains electronic components that
are polarity sensitive. Make sure that the furnace is wired
correctly and is properly grounded.

Accessory Terminals

One line voltage “ACC” 1/4” spade terminal is provided on
the furnace integrated control. See Figure 32 for integrated
control conguration. This terminal is energized when the
indoor blower is operating. Any accessory rated up to one
amp can be connected to this terminal with the neutral
leg of the circuit being connected to one of the provided
neutral terminals. If an accessory rated at greater than one
amp is connected to this terminal, it is necessary to use an
external relay.

One line voltage “HUM” 1/4” spade terminal is provided
on the furnace integrated control. See Figure 32 for
integrated control conguration. This terminal is energized
in the heating mode when the combustion air inducer is
operating. Any humidier rated up to one amp can be

507330-01 Issue 1721 Page 21 of 34

Figure 30. Condensing Unit Thermostat Designations

(Refer to Specic Thermostat and Outdoor Unit)

Indoor Blower Speeds

1. When the thermostat is set to “FAN ON,” the indoor
blower will run continuously on the fan speed when
there is no cooling or heating demand.

2. When the unit is running in the heating mode, the
indoor blower will run on the heating speed.

3. When there is a cooling demand, the indoor blower will
run on the cooling speed.

* Note: “R” Required on some outdoor units.

Figure 31. Wiring Diagram

507330-01Page 22 of 34 Issue 1721

-02 Integrated Control LED Codes

Red LED Flash Code Diagnostic Codes / Status of Furnace

LED Off No power to control or control hardware fault detected

Heartbeat

1

Control powered - displayed during all modes of operation if no errors are detected

1 Flash Reverse line voltage polarity

2 Flashes Improper earth ground

3 Flashes Burner failed to light, or lost ame during heat demand

4 Flashes Low ame signal - check ame sensor

5 Flashes Watchguard - burner failed to light, exceeded maximum number of retries or recycles

6 Flashes Not used

7 Flashes Primary or Secondary limit open or watchguard mode - limit switch open longer than 3 minutes

8 Flashes Rollout switch open

9 Flashes Pressure switch failed to close or opened during heat demand

10 Flashes Watchguard - Pressure switch opened 5 times during one heat demand

11 Flashes Pressure switch stuck closed prior to activation of combustion air inducer

12 Flashes Flame sensed without gas valve energized

13 Flashes Low line voltage

1

A “heartbeat” is indicated by a “slow ash” - 1 sec on 1 sec off, repeating

NOTE: Last 10 error codes are stored in memory, including when power is shut off to the unit. To recall, press and release button.
Most recent will be displayed rst, LED off for 3 sec, then next error code is displayed, etc. To clear error codes, depress and hold
button longer than 5 seconds.

Table 7. Diagnostic Codes for -02 Control

-03 Integrated Control LED Codes

Red LED Flash Code

LED Off No power to control or control hardware fault detected

Heartbeat

Continuous Rapid Flash Call for heat / burner operation

1 Flash Reverse line voltage polarity

2 Flashes Improper earth ground

3 Flashes Burner failed to light, or lost ame during heat demand

4 Flashes Low ame signal - check ame sensor

5 Flashes Watchguard - burner failed to light, exceeded maximum number of retries or recycles

6 Flashes Not used

7 Flashes Primary or Secondary limit open or watchguard mode - limit switch open longer than 3 minutes

8 Flashes Rollout switch open

9 Flashes Pressure switch failed to close or opened during heat demand

10 Flashes Watchguard - Pressure switch opened 5 times during one heat demand

11 Flashes Pressure switch stuck closed prior to activation of combustion air inducer

12 Flashes Flame sensed without gas valve energized

13 Flashes Low line voltage

1

A “heartbeat” is indicated by a “slow ash” - 1 sec on 1 sec off, repeating

2

Error codes are indicated by a “rapid ash” - the LED ashes X times at 1/2 sec on, 1/2 sec off, remains off for 3 sec, then repeats

NOTE: Last 10 error codes are stored in memory, including when power is shut off to the unit. To recall, press and release button.
Most recent will be displayed rst, LED off for 3 sec, then next error code is displayed, etc. To clear error codes, depress and hold
button longer than 5 seconds.

2

1

Normal operation - idle, continuous fan, cool

Diagnostic Codes / Status of Furnace

Table 8. Diagnostic Codes for -03 Control

507330-01 Issue 1721 Page 23 of 34

RED LED

Terminal Designations

120 HUM Humidier (120 VAC)

LINE Input (120 VAC)

XFMR Transformer (120 VAC)

CIRC Indoor Blower (120 VAC)

EAC Electronic Air Cleaner (120 VAC)

COOL Blower - Cooling Speed (24 VAC)

HEAT Blower - Heating Speed (24 VAC)

FAN Blower - Fan Speed (24 VAC)

PARK Dead terminals to park all speed taps

NEUTRALS Neutral Terminals (120 VAC)

FS Flame Sense

24 COM Common (24 VAC)

HUM 24 Humidier (24 VAC)

BLOWER OFF DELAY

RECALL BUTTON

Figure 32. Integrated Control

(Automatic Hot Surface Ignition System)

Demand
CAI

Ignitor
Gas Valve
Indoor Blower

Blower on time will be 45 seconds after gas valve is energized. Blower off time will depend on “OFF TIME” Setting.

ON

OFF

1

Pre-Purge

15

Ignitor Warm-up

35

Figure 33. Heating Sequence of Operation

Unit Start-Up

FOR YOUR SAFETY, READ BEFORE LIGHTING UNIT

WARNING

Do not use this furnace if any part have been
underwater. Immediately call a licensed professional
service technician (or equivalent) to inspect the furnace
and to replace any part of the control system and any
gas control which has been underwater.

Trial for
Ignition

39

Blower

“On” Delay

5 SEC80

Post

Purge

WARNING

If overheating occurs or if gas supply fails to shut off,
shut off the manual gas valve to the appliance before
shutting off electrical supply.

CAUTION

Before attempting to perform any service or
maintenance, turn the electrical power to unit OFF at
disconnect switch.

507330-01Page 24 of 34 Issue 1721

BEFORE LIGHTING smell all around the appliance area
for gas. Be sure to smell next to the oor because some
gas is heavier than air and will settle on the oor.

The gas valve on this unit will be equipped with a gas
control switch. Use only your hand to move the switch.
Never use tools. If the switch will not turn or if the control
switch will not move by hand, do not try to repair it.

Placing the Furnace into Operation

These units are equipped with an automatic ignition
system. Do not attempt to manually light burners on these
furnaces. Each time the thermostat calls for heat, the
burners will automatically light. The ignitor does not get hot
when there is no call for heat on units with an automatic
ignition system.

WARNING

If you do not follow these instructions exactly, a re
or explosion may result causing property damage,
personal injury or death.

Gas Valve Operation

See Figure 34

1. STOP! Read the safety information at the beginning
of this section.

2. Set the thermostat to the lowest setting.

3. Turn off all electrical power to the unit.

4. This furnace is equipped with an ignition device which
automatically lights the burners. Do not try to light the
burners by hand.

5. Remove the upper access panel.

6. Move switch on gas valve to OFF. Do not force. See
Figure 34.

7. Wait ve minutes to clear out any gas. If you then
smell gas, STOP! Immediately call your gas supplier
from a neighbor’s phone. Follow the gas supplier’s
instructions. If you do not smell gas go to next step.

Gas Valve Shown in “ON” Position

9. Replace the upper access panel.

10. Turn on all electrical power to the unit.

11. Set the thermostat to desired setting.

NOTE: When unit is initially started, steps 1 through
11 may need to be repeated to purge air from gas line.

12. If the appliance will not operate, follow the instructions
“Turning Off Gas to Unit” and call your service
technician or gas supplier.

Turning Off Gas to Unit

1. Set the thermostat to the lowest setting.

2. Turn OFF all electrical power to the unit if service is to
be performed.

3. Remove the upper access panel.

4. Move switch on gas valve to OFF. Do not force.

5. Replace the upper access panel.

Failure to Operate

If the unit fails to operate, check the following:

1. Is the thermostat calling for heat?

2. Are access panels securely in place?

3. Is the main disconnect switch closed?

4. Is there a blown fuse or tripped circuit breaker?

5. Is the lter dirty or plugged? Dirty or plugged lters will
cause the limit control to shut the unit off.

6. Is gas turned on at the meter?

7. Is the manual main shut-off valve open?

8. Is the internal manual shut-off valve open?

9. Is the unit ignition system in lock out? If the unit locks
out again, call the service technician to inspect the unit
for blockages.

10. Is pressure switch closed? Obstructed ue will cause
unit to shut off at pressure switch. Check ue and
outlet for blockages.

11. Are ame rollout switches tripped? If ame rollout
switches are tripped, call the service technician for
inspection.

Heating Sequence of Operation

See Figure 33

1. When thermostat calls for heat, combustion air blower
starts.

2. Combustion air pressure switch proves blower
operation. Switch is factory set and requires no
adjustment.

3. After a 15 second pre-purge, the hot surface ignitor
energizes.

Figure 34.

8. Move switch on gas valve to ON. Do not force. See
Figure 34.

507330-01 Issue 1721 Page 25 of 34

4. After a 20 second ignitor warm-up period, the gas
valve solenoid opens. A 4 second trial for ignition
period begins.

5. Gas is ignited, ame sensor proves the ame, and the
combustion process continues.

6. If ame is not detected after rst ignition trial, the
ignition control will repeat steps 3 and 4 four more
times before locking out the gas valve. The ignition
control will then automatically repeat steps 1 through
6 after 60 minutes.

7. To interrupt the 60 minute, move thermostat from
“Heat” to “OFF” then back to “Heat”. Heating sequence
then restarts at step 1.

Gas Pressure Adjustment

Gas Flow (Approximate)

Gas Meter Clocking Chart

Seconds for One Revolution

Capacity

-045 80 160 200 400

-070 55 110 136 272

-090 41 82 102 204

-110 33 66 82 164

-135 27 54 68 136

Natural - 1000 btu/cu ft LP - 2500 btu/cu ft

Furnace should operate at least 5 minutes before checking
gas ow. Determine time in seconds for two revolutions of
gas through the meter. (Two revolutions assures a more
accurate time.) Divide by two and compare to time in Table
9 below. If manifold pressure matches Table 10 and rate is
incorrect, check gas orices for proper size and restriction.
Remove temporary gas meter if installed.

Natural LP

1 cu ft

Dial

2 cu ft

Dial

Table 9.

1 cu ft

Dial

2 cu ft

Dial

Supply Pressure Measurement

A threaded plug on the inlet side of the gas valve provides
access to the supply pressure tap. Remove the threaded
plug, install a eld provided barbed tting and connect a
manometer to measure supply pressure. See Table 10
for proper line pressure. Replace the threaded plug after
measurements have been taken.

Manifold Pressure Measurement

1. Remove the threaded plug from the outlet side of
the gas valve and install a eld provided barbed
tting. Connect to a manometer to measure manifold
pressure.

2. Start unit and allow 5 minutes for unit to reach steady
state.

3. While waiting for the unit to stabilize, observe the
ame. Flame should be stable and should not lift from
burner. Natural gas should burn blue.

4. After allowing unit to stabilize for 5 minutes, record
manifold pressure and compare to value given in
Table 10.

NOTE: Shut unit off and remove manometer as soon as an
accurate reading has been obtained. Take care to remove
barbed tting and replace threaded plug.

Manifold Pressure

Between 2000 and 7500 ft, certain units require manifold
pressure adjustments specied in Table 10. Manifold
pressure should be measured, and adjusted as required
during unit start up.

NOTE: LP/Propane installations require a gas conversion
Orice Kit as specied in Table 12.

NOTE: To obtain accurate reading, shut off all other gas
appliances connected to meter.

Manifold Pressure and Line Pressure at Various Altitudes

Manifold Pressure (in. w.c.)

Capacity

045

070 3.2 10.0 2.8 10.0

090 3.2 10.0 2.7 9.6

110 3.5 10.0 3.0 9.6

135 3.5 10.0 2.9 9.6

1

Manifold pressure adjustments based on 1020 Btu/ft3 gas for natural and 2500 Btu/ft3 gas for LP (corrected to standard conditions).

Consult local utility for actual local heating value.

2

A natural to LP/Propane gas conversion Orice Kit is required to convert this unit. Refer to kit instructions for conversion procedure.

3

A high altitude natural Orice Kit is required.

0 - 2000 ft. 2001 - 4500 ft. 4501 - 7500 ft. 7501 - 10000 ft. Minimum Max.

Nat.
Gas

3.5 10.0

LP

Gas

Nat.

2

Gas

3.2 10.0 3.0 10.0

LP

Gas

Nat.

2

Gas

1

LP

Gas

Nat.

2

3

Gas

3.5 10.0 4.5 11.0 13.0

LP

Gas

2

Line Pressure (in. w.c.)

Nat.
Gas

LP

Gas

Nat. &

2

LP

Table 10.

507330-01Page 26 of 34 Issue 1721

Proper Combustion

Furnace should operate a minimum 15 minutes with correct
manifold pressure and gas ow rate before checking
combustion. Take combustion sample beyond the ue out
let and compare to the tables below. The maximum carbon
monoxide reading should not exceed 100 ppm.

Capacity CO2% for Nat CO2% for LP

-045

-070

-090

7.2 - 7.8 7.5 - 9.0

-110

-135

Table 11.

High Altitude

This furnace is carefully designed for optimal performance
under a wide range of operating conditions. To ensure
proper operation at higher altitudes, certain adjustments
and/or kits may be required.

Pressure Switch

Between 4501 and 7500 ft, some units may require a
pressure switch change. Table 12 lists the available
Pressure Switch Kits providing the minimum allowable
pressure switch set points, in this altitude range, for each
unit. The need for a Pressure Switch Kit may be evaluated
by comparing the pressure measured at the pressure
switch under steady state conditions (after 15 minutes of
run time) against the as shipped switch set point. Insufcient
negative pressure may lead to nuisance pressure switch
trips and possible unit lock outs.

Above 7500 feet, all units require both a burner orice
change and a pressure switch change per Table 12.

Fan Control

The fan on time of 45 seconds is not adjustable. The heat
fan off delay (amount of time that the blower operates after
the heat demand has been satised) may be adjusted by
changing the jumper position across the ve pins on the
integrated control. The unit is shipped with a factory fan
off delay setting of 90 seconds. The fan off delay affects
comfort and is adjustable to satisfy individual applications.
Adjust the fan off delay to achieve a supply air temperature
between 90° and 110° F at the moment that the blower
is de-energized. Longer off delay settings provide lower
return air temperatures; shorter settings provide higher
return air temperatures. See Figure 35.

Figure 35. Heat Fan Off Time in Seconds

Orice Kits and Pressure Switch Kits at Various Altitudes

0 - 4500 ft. 4501 - 7500 ft. 7501 - 10000 ft.

Natural

Capacity

045

070

090

110

135

1

Minimum allowable set points for this altitude range. Application of a Pressure Switch with lower set point (less negative / closer to zero) is not

permitted.

2

Kit contains burner orices and gas valve regulator spring(s).

Pressure

Switch Kit

As Shipped

(-0.65” w.c.)

As Shipped

(-0.68” w.c.)

As Shipped

(-0.65” w.c.)

As Shipped

(-0.68” w.c.)

As Shipped

(-0.65” w.c.)

1

to LP /

Propane

Orice Kit

2

11K50

(0.034”)

LP /

Propane

to Natural

Orice Kit

73W802

(0.063”)

Pressure1

Switch Kit

80W52

(-0.60” w.c.)

80W52

(-0.60” w.c.)

80W52

(-0.60” w.c.)

80W57

(-0.65” w.c.)

80W52

(-0.60” w.c.)

Natural

to LP /

Propane

Orice Kit

11K502

(0.034”)

LP /

Propane

to Natural

Orice Kit

73W802

(0.063”)

Pressure1

Switch Kit

80W51

(-0.55” w.c.)

80W51

(-0.55” w.c.)

80W51

(-0.55” w.c.)

80W52

(-0.60” w.c.)

80W51

(-0.55” w.c.)

Natural

Orice Kit

51W01

(0.055”)

LP /

Propane

Orice Kit

11K452

(0.032”)

Table 12.

507330-01 Issue 1721 Page 27 of 34

Constant Torque Motor

These units are equipped with a constant torque ECM
motor. It has a DC motor coupled to an electronic control
module,both contained in the same motor housing. The
motor is programmed to provide constant torque at each of
the ve selectable speeds. The motor has ve speed taps.
Each tap requires 24 volts to energize.

Other Unit Adjustments

Primary and Secondary Limits

The primary limit is located on the heating compartment
vestibule panel. The secondary limits (if equipped) are
located in the blower compartment, attached to the back
side of the blower. These auto reset limits are factory set
and require no adjustment.

Thermostat Heat Anticipation

Set the heat anticipator setting (if adjustable) according to
the amp draw listed on the wiring diagram that is attached
to the unit.

NOTE: Do not secure the electrical conduit directly to the
air ducts or structure.

Electrical

1. Check all wiring for loose connections.

2. Check for the correct voltage at the furnace (furnace
operating). Correct voltage is 120VAC ± 10%.

3. Check amp-draw on the blower motor with inner
blower panel in place.

Unit Nameplate__________ Actual_______________

Blower Speeds

Follow the steps below to change the blower speeds.

1. Turn off electrical power to furnace.

2. Remove blower access panel.

3. Disconnect existing speed tap at integrated control
speed terminal.

NOTE: Termination of any unused motor leads must
be insulated.

4. Place unused blower speed tap on integrated control
“PARK” terminal or insulate.

5. Refer to blower speed selection chart on unit wiring
diagram for desired heating or cooling speed. See
Blower performance data.

6. Connect selected speed tap at integrated control
speed terminal.

7. Resecure blower access panel.

8. Turn on electrical power to furnace.

9. Recheck temperature rise.

Flame Rollout Switches

This manually reset switches are located on the Front of
the burner box.

Pressure Switch

The pressure switch is located in the heating compartment
adjacent to the combustion air inducer. The switch checks
for proper combustion air inducer operation before allowing
ignition trial. The switch is factory set and requires no
adjustment.

Temperature Rise

After the furnace has been started, and supply and return
air temperatures have been allowed to stabilize, check the
temperature rise. If necessary, adjust the blower speed to
maintain the temperature rise within the range shown on
the unit nameplate. Increase the blower speed to decrease
the temperature. Decrease the blower speed to increase
the temperature rise. Failure to adjust the temperature rise
may cause erratic limit operation.

507330-01Page 28 of 34 Issue 1721

Blower Performance

A80UH1E / 80G1UHE 045*A12 Performance (Less Filter)

External

Static

Pressure

in. w.c.

0.00 1380 265 1155 165 995 120 975 115 945 105

0.10 1345 270 1120 175 950 120 880 105 865 100

0.20 1320 285 1080 190 900 125 805 105 700 85

0.30 1290 295 1055 200 875 135 750 110 640 90

0.40 1265 310 1010 205 825 145 710 120 595 95

0.50 1230 315 990 215 790 155 660 125 535 100

0.60 1190 330 990 230 750 165 630 135 500 100

0.70 1165 340 915 235 705 170 570 140 435 11 5

0.80 1130 350 880 245 670 180 535 150 380 120

A80UH1E / 80G1UHE 070*B12 Performance (Less Filter)

External

Static

Pressure

in. w.c.

0.00 1415 265 1330 170 1215 135 1175 125 1075 85

0.10 1415 280 1295 170 1145 145 1130 130 955 95

0.20 1355 290 1225 185 1110 150 1080 140 885 100

0.30 1330 300 1190 200 1060 160 1035 155 825 110

0.40 1290 310 1155 205 1015 175 970 160 770 120

0.50 1245 325 1115 215 980 180 930 170 695 125

0.60 1225 335 1045 230 920 190 865 180 625 135

0.70 1190 350 1000 235 855 205 790 190 540 140

0.80 1160 365 925 245 790 205 735 200 445 145

High Medium - High Medium Medium - Low Low

cfm watts cfm watts cfm watts cfm watts cfm watts

High Medium - High Medium Medium - Low Low

cfm watts cfm watts cfm watts cfm watts cfm watts

Air Volume / Watts at Various Blower Speeds

Air Volume / Watts at Various Blower Speeds

A80UH1E / 80G1UHE 090*B16 Performance (Less Filter)

External

Static

Pressure

in. w.c.

0.00 1785 380 1570 270 1440 220 1395 190 1190 125

0.10 1755 395 1535 275 1420 230 1350 205 1140 135

0.20 1730 415 1505 290 1380 245 1310 215 1110 145

0.30 1690 435 1460 305 1345 260 1275 230 1065 160

0.40 1645 440 1435 320 1310 270 1240 240 1010 165

0.50 1615 455 1395 335 1265 285 1180 255 955 175

0.60 1590 470 1350 350 1210 290 1150 265 915 190

0.70 1545 475 1300 360 1175 305 1095 275 860 200

0.80 N/A N/A 1270 370 1140 310 1040 285 820 210

507330-01 Issue 1721 Page 29 of 34

High Medium - High Medium Medium - Low Low

cfm watts cfm watts cfm watts cfm watts cfm watts

Air Volume / Watts at Various Blower Speeds

0.80 1905 785 1635 560 1380 425 1215 350 975 270 1965 785 1640 555 1400 425 1210 345 1025 275

0.70 1965 755 1670 555 1420 410 1255 330 1015 255 2000 765 1675 535 1465 410 1255 325 1080 265

0.60 2010 750 1710 535 1470 390 1305 320 1080 240 2055 755 1725 515 1495 400 1305 315 1135 250

0.50 2025 730 1740 520 1500 375 1340 300 1130 225 2095 730 1770 500 1535 385 1365 300 1175 235

0.40 2050 715 1785 495 1550 360 1385 285 1175 210 2135 715 1830 485 1585 365 1395 285 1230 225

0.30 2090 695 1830 480 1595 345 1440 275 1235 200 2165 700 1850 465 1650 355 1455 275 1285 210

0.20 2135 680 1865 465 1630 330 1470 260 1280 190 2210 680 1895 460 1680 335 1510 255 1350 200

0.10 2180 655 1905 445 1690 305 1510 240 1340 175 2260 655 1945 425 1740 315 1550 240 1400 185

0.00 2230 635 1945 430 1715 295 1555 230 1470 185 2315 645 1990 415 1780 300 1610 230 1510 200

cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts

Pressure

in. w.c.

External

Static

Bottom Return Air, Side Return Air with Optional Return Air Base, Return

Air from Both Sides or Return Air from Bottom and One Side.

A80UH1E / 80G1UHE 110*C20 Performance (Less Filter)

High

0.80 1935 785 1635 560 1420 435 1225 350 1055 285 1950 795 1645 560 1415 435 1225 345 1040 285

0.70 1980 765 1680 540 1465 420 1265 330 1105 270 1990 775 1685 540 1450 425 1265 330 1095 270

0.60 2020 750 1725 525 1515 405 1320 320 1145 255 2030 760 1715 530 1495 405 1325 320 1140 255

0.50 2060 735 1760 510 1545 385 1370 305 1200 245 2070 735 1765 515 1545 390 1370 305 1180 245

0.40 2090 715 1800 495 1585 370 1405 285 1235 230 2135 720 1810 490 1595 370 1410 290 1225 230

0.30 2125 695 1835 475 1635 355 1450 275 1285 215 2165 715 1850 475 1645 355 1470 275 1285 215

0.20 2150 675 1865 450 1655 640 1490 260 1340 205 2210 695 1885 465 1680 340 1510 265 1350 205

0.10 2200 655 1910 440 1705 315 1535 240 1385 190 2250 675 1945 445 1730 320 1555 245 1400 190

0.00 2255 640 1940 420 1750 310 1580 230 1485 185 2290 655 1980 425 1775 310 1605 235 1495 195

cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts

Pressure

in. w.c.

External

Static

Bottom Return Air, Side Return Air with Optional Return Air Base, Return

Air from Both Sides or Return Air from Bottom and One Side.

A80UH1E / 80G1UHE 090*C20 Performance (Less Filter)

High

Medium -

High

Medium

Medium -

Low

Low High

Air Volume / Watts at Various Blower Speeds

Single Side Return Air - Air volumes in bold require eld fabricated transition

to accommodate 20 x 25 x 1 in. air lter in order to maintain proper air velocity.

Medium -

High

Medium

Medium -

Low

Low High

Air Volume / Watts at Various Blower Speeds

Single Side Return Air - Air volumes in bold require eld fabricated transition

to accommodate 20 x 25 x 1 in. air lter in order to maintain proper air velocity.

Medium -

High

Medium

Medium -

Low

Low

Medium -

High

Medium

Medium -

Low

Low

507330-01Page 30 of 34 Issue 1721

Low

Low

Medium -

Medium

High

Medium -

Single Side Return Air - Air volumes in bold require eld fabricated transition

to accommodate 20 x 25 x 1 in. air lter in order to maintain proper air velocity.

Low High

Air Volume / Watts at Various Blower Speeds

Low

Medium -

Medium

High

Medium -

High

Bottom Return Air, Side Return Air with Optional Return Air Base, Return

Air from Both Sides or Return Air from Bottom and One Side.

cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts cfm watts

0.00 2495 755 2295 590 2045 435 1845 315 1650 230 2365 725 2295 575 2005 410 1820 300 1635 235

0.10 2440 780 2220 620 2015 445 1820 330 1615 245 2350 745 2210 595 2000 435 1745 320 1530 230

0.20 2390 790 2175 640 1935 470 1735 350 1550 255 2330 775 2175 625 1945 455 1730 330 1490 250

0.30 2360 805 2140 655 1895 490 1720 370 1485 275 2245 785 2135 645 1895 475 1655 355 1425 265

0.40 2285 835 2125 675 1850 510 1660 380 1455 290 2215 810 2085 660 1840 495 1600 375 1385 285

0.50 2240 860 2060 690 1815 535 1610 400 1415 310 2175 825 2045 680 1815 505 1590 390 1340 290

0.60 2225 865 2015 715 1785 550 1535 420 1330 320 2125 845 1995 700 1765 530 1525 405 1300 310

0.70 2160 895 1955 735 1755 570 1500 440 1265 340 2095 865 1950 710 1700 545 1485 420 1260 325

Static

A80UH1E / 80G1UHE 135*D20 Performance (Less Filter)

507330-01 Issue 1721 Page 31 of 34

External

in. w.c.

Pressure

0.80 2105 905 1925 750 1715 580 1435 450 1215 345 2065 880 1890 725 1680 655 1415 445 1205 345

Service

WARNING

ELECTRICAL SHOCK, FIRE, OR EXPLOSION

HAZARD.

Failure to follow safety warnings exactly 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 furnace.

When servicing controls, label all wires prior to
disconnecting. Take care to reconnect wires correctly.
Verify proper operation after servicing.

At the beginning of each heating season, a qualied
technician should check the system as follows:

Blower

Check the blower wheel for debris and clean if necessary.
The blower motors are pre-lubricated for extended bearing
life. No further lubrication is needed.

WARNING

The blower access 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

Filters are installed external to the unit. Filters should
be inspected monthly. Clean or replace the lters when
necessary to ensure that the furnace operates properly.
Replacement lters must be rated for high velocity airow.
Table 1 lists recommended lter sizes.

Flue and Chimney

1. Check ue pipe, chimney and all connections for
tightness and to make sure there is no blockage.

2. Check unit for proper draft.

Electrical

1. Check all wiring for loose connections.

2. Check for the correct voltage at the furnace (furnace
operating). Correct voltage is 120VAC ± 10%.

3. Check amp draw on the blower motor with inner blower
panel in place.

Unit Nameplate___________ Actual_____________

Cleaning the Burners

NOTE: Use papers or protective covering in front of the

furnace during cleaning.

4. Turn off both electrical and gas power supplies to
furnace.

5. Label the wires from gas valve, rollout switches,
primary limit switch and make-up box then disconnect
them.

6. Disconnect gas supply piping. Remove the screw
securing the burner box cover and remove cover.
Remove the four screws securing the burner manifold
assembly to the vestibule panel and remove the
assembly from the unit.

7. To clean burners, run a vacuum cleaner with a soft
brush attachment over the face of burners. Visually
inspect inside the burners and crossovers for any
blockage caused by foreign matter. Remove any
blockage. Figure 36 shows burner detail.

8. Reinstall burner box, manifold assembly and burner
box cover.

9. Re-install gas supply and turn on electrical power to
furnace.

507330-01Page 32 of 34 Issue 1721

Figure 36. Burner Assembly Removal

Repair Parts List

The following repair parts are available through independent Allied Air dealers. When ordering parts, include the complete
furnace model number listed on the CSA International nameplate — Example: A801UH045JP24A-01. All service must be
performed by a licensed professional installer (or equivalent), service agency, or gas supplier.

Cabinet Parts

• Upper access panel

• Blower panel

• Top cap

Control Panel

• Parts Transformer

• Integrated control

• Door interlock switch

• Circuit breaker

Blower Parts

• Blower wheel

• Blower housing

• Motor

• Motor mounting frame

• Motor capacitor

• Blower housing cutoff plate

Heating Parts

• Flame sensor

• Heat exchanger assembly

• Gas manifold

• Combustion air inducer

• Gas valve

• Main burner cluster

• Main burner orices

• Pressure switch

• Ignitor

• Primary limit control

• Flame rollout switch

• Secondary limit

507330-01 Issue 1721 Page 33 of 34

Requirements for Commonwealth of Massachusetts

Modications to NFPA-54, Chapter 10

Revise NFPA-54 section 10.8.3 to add the following

requirements:

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 the nished grade in the area of the venting,
including but not limited to decks and porches, the following
requirements shall be satised:

1. INSTALLATION OF CARBON MONOXIDE
DETECTORS. At the time of installation of the side
wall, horizontally vented, gas-fueled equipment, the
installing plumber or gas tter shall observe that a
hard-wired carbon monoxide detector with an alarm
and battery backup is installed on the oor level where
the gas equipment is to be installed. In addition, the
installing plumber or gas tter 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, horizontally vented, gas-fueled equipment.
It shall be the responsibility of the property owner to
secure the services of qualied licensed 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 backup
may be installed on the next adjacent oor level.

b. In the event that the requirements of this subdivision

cannot be met at the time of completion of
installation, the owner shall have a period of thirty
(30) days to comply with the above requirements;
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
certied.

3. SIGNAGE. A metal or plastic identication 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 or local gas inspector of the
side wall, horizontally vented, gas-fueled equipment
shall not approve the installation unless, upon
inspection, the inspector observes carbon monoxide
detectors and signage installed in accordance with the
provisions of 248 CMR 5.08(2)(a) 1 through 4.

EXEMPTIONS: The following equipment is exempt
from 24 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, gas­fueled equipment installed in a room or structure
separate from the dwelling, building or structure used
in whole or in part for residential purposes.

MANUFACTURER REQUIREMENTS - GAS EQUIPMENT

VENTING SYSTEM PROVIDED.

When the manufacturer of Product Approved side wall,
horizontally vented, gas-fueled 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.

MANUFACTURER REQUIREMENTS - GAS EQUIPMENT

VENTING SYSTEM NOT PROVIDED.

When the manufacturer of Product Approved sidewall,
horizontally vented, gas-fueled equipment does not
provide the parts for venting the ue gases, but identies
“special venting systems,” the following requirements shall
be satised 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.

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.

507330-01Page 34 of 34 Issue 1721