Allied Air A95DF2V User manual

506788-01 Page 1 of 49
Issue 1130
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.
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
CAUTION
Manufactured By
Allied Air Enterprises, Inc.
A Lennox International, Inc. Company
215 Metropolitan Drive
West Columbia, SC 29170
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.
WARNING
Unit Dimensions ............................................................ 2
A95DF2V/95G2DFV Parts Arrangement ...................... 3
A95DF2V/95G2DFV Gas Furnace ............................... 4
Shipping and Packing List ............................................ 4
Safety Information ......................................................... 4
Use of Furnace as a Construction Heater .................... 5
General ......................................................................... 6
Combustion, Dilution, Ventilation Air ............................. 6
Setting Equipment ........................................................ 6
Filters .......................................................................... 10
Duct System ................................................................ 10
Pipe and Fittings Specifications .................................. 10
Joint Cementing Procedure ........................................ 12
TABLE OF CONTENTS
Venting Practices ........................................................ 12
Vent Piping Guidelines ................................................ 13
Gas Piping .................................................................. 26
Electrical ..................................................................... 29
Unit Start Up ................................................................ 37
Gas Pressure Adjustment ........................................... 38
High Altitude Information ............................................. 39
Other Unit Adjustments ............................................... 40
Blower Motor Performance ......................................... 41
Service ........................................................................ 43
Planned Service .......................................................... 45
Repair Parts List ......................................................... 46
Start Up Checklist ....................................................... 47
This manual must be left with the homeowner for future reference.
INSTALLATION INSTRUCTIONS
A95DF2V, 95G2DFV
Warm Air Gas Furnace / Downflow Air Discharge
Direct Vent Only
(P) 506788-01
*P506788-01*

506788-01Page 2 of 49 Issue 1130
EXHAUST AIR
OUTLET
COMBUSTION
AIR INTAKE
2ï1/16 (52)
GAS PIPING INLET
(Either Side)
ELECTRICAL INLET
(Either Side)
Return Air
Opening
WEIVEDIS
TOP VIEW
27ï3/4
19ï1/4
(489)
9ï1/8 (232) Right
6ï9/16 (167) Left
2 (51)
Either Side
3/4
(19)
B
Supply
Air
9/16
(14)
9/16
(14)
9/16
(14)
19ï7/16
(494)
CONDENSATE
TRAP CONNECTION
5
(127)
6ï1/2 (165)
Either Side
2ï1/4
(57)
(Either Side)
1 (25)
Front Panel (705)
AIR FLOW
33
(838)
C
3/4
(19)
3/4
(19)
FRONT VIEW
Supply
Air
9/16
(14)
9
(229)
Unit Dimensions - inches (mm)
Model Number
A95DF2V/95G2DFV A B C
in. mm in. mm in. mm
045-12
070-16 17−1/2 446 16−3/8 416 16 406
090-20
110-20 21 533 19−7/8 504 19−1/2 495

506788-01 Page 3 of 49
Issue 1130
Figure 1
Expanded View

506788-01Page 4 of 49 Issue 1130
Gas Furnace
This Category IV gas furnace is shipped ready for installation
in the downflow position.
The furnace is equipped for installation in natural gas
applications. A conversion kit (ordered separately) is required
for use in propane/LP gas applications.
This unit must be installed as a Direct Vent gas central
furnace, only.
NOTE: In Direct Vent installations, combustion air is taken
from outdoors and flue gases are discharged outdoors. See
Figure 2 for application involving roof termination.
Shipping and Packing List
Package 1 of 1 contains:
1 - Assembled Gas Unit
1 - Bag assembly containing the following:
1 - Snap bushing
1 - Snap Plug
1 - Wire tie
1 - Condensate trap
1 - Condensate trap cap
1 - Condensate trap clamp
1 - 2” diameter debris screen
Check equipment for shipping damage. If you find any
damage, immediately contact the last carrier.
Please refer to specification sheets for available accessories.
Safety Information
Use only the type of gas approved for use with this furnace.
Refer to unit nameplate.
This unit is CSA International certified to ANSI Z21.47 and
CSA 2.3 standards.
Building Codes
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/NFPA 54). The National Fuel Gas Code
is available from the American National Standards
Institute, Inc., 11 West 42nd Street, New York, NY 10036.
In Canada, installation must conform with current National
Standard of Canada CSA-B149 Natural Gas and Propane
Installation Codes, local plumbing or waste water codes and
other applicable local codes.
In order to ensure proper unit operation in non-direct vent
applications, combustion and ventilation air supply must be
provided according to the current National Fuel Gas Code
or CSA-B149 standard.
Figure 2
DANGER OF EXPLOSION!
DANGER
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 floor and may be difficult
to smell. An LP/Propane leak detector should be installed
in all LP applications.
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.
WARNING
As with any mechanical equipment, personal injury can
result from contact with sharp sheet metal edges. Be
careful when you handle this equipment.
CAUTION

506788-01 Page 5 of 49
Issue 1130
Locations and Clearances
This furnace is CSA International certified for installation
clearances to combustible material as listed on the unit
nameplate and in the table in Figure 7. Accessibility and
service clearances must take precedence over fire protection
clearances.
NOTE: When furnace is installed on a combustible floor, a
downflow combustible flooring base must be installed
between the furnace and the floor.
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 floor.
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 or CSA B149 standards.
Note: Furnace must be adjusted to obtain a temperature
rise within the range specified on the unit nameplate. Failure
to do so may cause erratic limit operation and premature
heat exchanger failure.
This gas 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 (Figure 3), it
shall be installed in parallel with, or on the upstream side of,
cooling units to avoid condensation in the heating
compartment. With a parallel flow arrangement, a damper
(or other means to control the flow of air) must adequately
prevent 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.
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/NFPANo. 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
In Canada, all electrical wiring and grounding for the unit
must be installed according to the current regulations of the
Canadian Electrical Code Part I (CSA Standard C22.1) and/
or local codes.
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.
This gas furnace may be installed in alcoves, closets, attics,
basements, garages, and utility rooms.
This furnace design has NOT been CSA certified for
installation in mobile homes, recreational vehicles, or
outdoors.
Never use an open flame to test for gas leaks. Check all
connections using a commercially available soap solution
made specifically for leak detection.
Use of Furnace as Construction Heater
These units are not recommended for use 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 filters will damage the unit.
These 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.
•A room thermostat must control the furnace. The use of
fixed 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 filters must be installed in the system and must be
maintained during construction.
Heating Unit Installed Parallell to Air Handler Unit
AIR HANDLER
GAS UNIT
Dampers
(open during cooling
operation only)
Dampers
(open during heating
operation only)
Figure 3

506788-01Page 6 of 49 Issue 1130
INSTALLATION – Setting Equipment
WARNING
Do not install the furnace on its front, back or in the
horizontal position. See Figure 6. Do no 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.
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, condensate
trap and drain connections, and installation and service
clearances [24 inches (610 mm) at unit front]. The unit must
be level from side to side. Tilt the unit slightly (maximum
1/2 in. from level) from back to front to aid in the draining of
the heat exchanger. See Figure 5.
•Air filters 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 the instructions in section for
Combustion, Dilution and Ventilation Air in a confined
space with air from outside.
•The furnace heat exchanger, components, duct system,
air filters and evaporator coils must be thoroughly
cleaned following final construction cleanup.
•All furnace operating conditions (including ignition, input
rate, temperature rise and venting) must be verified
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.
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 vent termination point.
•When the furnace is installed in non-direct vent
applications, do not install the furnace where drafts might
blow directly into it. This could cause improper
combustion and unsafe operation.
•When the furnace is installed in a non-direct vent
applications, do not block the furnace combustion air
opening 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.
•When the furnace is installed in an unconditioned space,
consider provisions required to prevent freezing of the
condensate drain system.
NOTE: The Commonwealth of Massachusetts stipulates
these additional requirements:
•Gas furnaces shall be installed by a licensed plumber
or fitter 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
floored.
These units should not be installed in areas normally
subject to freezing temperatures.
CAUTION
Product Contains Fiberglass Wool.
Disturbing the insulation in this product during
installation, maintenance, or repair will expose you to
fiberglass wool. Breathing this may cause lung cancer.
(Fiberglass wool is known to the State of California to
cause cancer.)
Fiberglass wool may also cause respiratory, skin, and
eye irritation.
To reduce exposure to this substance or for further
information, consult material safety data sheets available
from address shown below, or contact your supervisor.
Allied Air Enterprises, Inc.
215 Metropolitan Drive
West Columbia, SC 29170
WARNING

506788-01 Page 7 of 49
Issue 1130
Shipping Bolt Removal
NOTE: Units with a 1/2 hp blower motors are equipped with
three flexible legs and one rigid leg. The rigid leg is equipped
with a shipping bolt and a flat white plastic washer (rather
than the rubber mounting grommet used with a flexible
mounting leg). See Figure 4. 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.
WARNING
Blower access panel must be securely in place when
blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into living
space resulting in personal injury or death.
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or
alcove installations are shown in Figure 7.
Figure 6
Figure 4
Units with 1/2 HP Blower Motor
Figure 5
Setting Equipment
FRONT VIEW SIDE VIEW
AIR FLOW AIR FLOW
1/2"
max.
AIR FLOW
SIDE VIEW
Unit must be level side−to−side. Unit may be positioned
from level to 1/2" toward the front to aid in draining.

506788-01Page 8 of 49 Issue 1130
WARNING
Improper installation of the furnace can result in personal
injury or death. Combustion and flue products must
never be allowed to enter the return air system or air in
the living space. Use sheet metal screws and joint tape
to seal return air system to furnace.
In platform installations with furnace return, 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.
For no reason should return and supply air duct systems
ever be connected to or from other heating devices such
as a fireplace or stove, etc. Fire, explosion, carbon
monoxide poisoning, personal injury and/or property
damage could result.
Installation on Non-Combustible Flooring
1. Cut floor opening keeping in mind clearances listed on
unit rating plate. Also keep in mind gas supply
connections, electrical supply, flue and air intake
connections and sufficient installation and servicing
clearances. See Table 1 for correct floor opening size.
2. Flange warm air plenum and lower the plenum into the
opening.
3. Set the unit over the plenum and seal the plenum to the
unit.
4. Ensure that the seal is adequate.
Installation on Combustible Flooring
1. When unit is installed on a combustible floor, a downflow
combustible flooring base must be installed between the
furnace and the floor. The base must be ordered
separately. See Table 2 for opening size to cut in floor.
The unit may be installed three ways in downflow applica-
tions: on non-combustible flooring, on combustible flooring
using an additive base, or on a reverse-flow cooling coil
cabinet. Do not drag the unit across the floor in the
downflow position. Floor and furnace flange damage
will result.
Refer to Figure 7 for clearances in downflow applica-
tions.
Figure 7
Top
Bottom
Left Side Right Side
Top 0
*Front 0
Back 0
Sides 0†
Vent 0
Floor NC ‡
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
†Allow proper clearances to accommodate condensate trap.
‡The furnace may be installed on a combustible wood oor if an optional
additive base is installed between the furnace and the combustible oor.
Downflow Application Installation Clearances
CAUTION
The furnace and combustible flooring base shall not be
installed directly on carpeting, tile, or other combustible
material other than wood flooring.
Figure 8
SUPPLY AIR
PLENUM
PROPERLY
SIZED FLOOR
OPENING
FURNACE
Table 1
Non-Combustible Floor Opening Size
Cabinet Width
Front to Rear Side to Side
in.mm in. mm
B Cabinet (17.5") 19 − 3/4 502 16 − 5/8 422
C Cabinet (21") 19 − 3/4 502 20−1/8 511
NOTE: Floor opening dimensions listed are 1/4 inch (6 mm) larger than
the unit opening. See dimension drawing on page 2.

506788-01 Page 9 of 49
Issue 1130
2. After opening is cut, set the combustible flooring base
into opening.
3. Check fiberglass strips on the combustible flooring base
to make sure they are properly glued and positioned.
4. Lower supply air plenum into the combustible flooring
base until plenum flanges seal against fiberglass strips.
er opening is
NOTE: Be careful not to damage fiberglass strips. Check
for a tight seal.
5. Set the furnace over the plenum.
6. Ensure that the seal between the furnace and plenum
is adequate.
Installation on Cooling Coil Cabinet
NOTE: Downflow combustible flooring kit is not used.
1. Refer to reverse-flow coil installation instructions for
correctly sized opening in floor and installation of
cabinet.
2. When cooling cabinet is in place, set and secure the
furnace according to the instructions that are provided
with the cooling coil. Secure the furnace to the cabinet.
3. Seal the cabinet and check for air leaks.
Return Air Opening - Downflow Units
Return air may be brought in only through the top opening
of a furnace installed in the downflow position. The following
steps should be taken when installing plenum:
1. Bottom edge of plenum should be flanged with a
hemmed edge (See Figure 11 or 12).
2. Sealing strips should be used to ensure an airtight seal
between the cabinet and the plenum.
3. In all cases, plenum should be secured to top of furnace
using sheet metal screws.
4. Make certain that an adequate seal is made.
Combustible Flooring Base Opening Size
Table 2
Cabinet
Width
Catalog
Number
Front to Rear Side to Side
in. mm in. mm
B Cabinet
(17.5") 11M60 22 559 18 − 3/4 476
C Cabinet
(21") 11M61 22 559 22 − 3/4 578
Figure 9
FURNACE
SUPPLY AIR
PLENUM
COMBUSTIBLE
FLOORING BASE
PROPERLY
SIZED FLOOR
OPENING
Figure 10
COOLING COIL
PLENUM
PROPERLY
SIZED FLOOR
OPENING
FURNACE
Figure 11
SECURE FROM
OUTSIDE CABINET
PLENUM
(Field Provided)
SEALING STRIP
(Field Provided)
Side View
CABINET
SIDE PANEL
Figure 12
SECURE FROM
INSIDE CABINET
PLENUM
(Field Provided) SEALING STRIP
(Field Provided)
Side View
CABINET
SIDE PANEL

506788-01Page 10 of 49 Issue 1130
Filters
This unit is not equipped with a filter or rack. A field provided
filter is required for the unit to operate properly. Table 3 lists
recommended filter sizes.
A filter must be in place whenever the unit is operating.
CAUTION
Solvent cements for plastic pipe are flammable liquids
and should be kept away from all sources of ignition.
Do not use excessive amounts of solvent cement when
making joints. Good ventilation should be maintained
to reduce fire hazard and to minimize breathing of
solvent vapors. Avoid contact of cement with skin and
eyes.
Duct System
Use industry-approved standards 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.
NOTE: This furnace is not certified for operation in heating
mode (indoor blower operating at selected heating speed)
with an external static pressure which exceeds 0.8 inches
w.c. Operation at these conditions may result in improper
limit operation.
Supply Air Plenum
If the fumace is installed without a cooling coil, a removable
access panel should be installed in the supply air duct. The
access panel should be large enough to permit inspection
(by reflected 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
fireplace) is installed.
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 flue products can be pulled
back down the vent pipe and into the room. This reverse
flow of the flue 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.
Use fiberglass sealing strips, caulking, or equivalent sealing
method between the plenum and the furnace cabinet to
ensure a tight seal. If a filter is installed, size the return air
duct to fit the filter frame.
Pipe & Fittings Specifications
All pipe, fittings, primer and solvent cement must conform
with American National Standard Institute and the American
Society for Testing and Materials (ANSI/ASTM) standards.
The solvent shall be free flowing and contain no lumps,
undissolved particles or any foreign matter that adversely
affects the joint strength or chemical resistance of the
cement. The cement shall show no gelation, stratification,
or separation that cannot be removed by stirring. Refer to
Table 4 below for approved piping and fitting materials.
Table 3
Furnace
Cabinet Width
Filter Size
16 x 25 x 1 (1)
17−1/2"
21"
Schedule 40 PVC (Pipe) D1785
Schedule 40 PVC (Cellular Core Pipe) F891
Schedule 40 PVC (Fittings) D2466
Schedule 40 CPVC (Pipe) F441
Schedule 40 CPVC (Fittings) F438
SDR−21 PVC or SDR−26 PVC (Pipe) D2241
SDR−21 CPVC or SDR−26 CPVC (Pipe) F442
Schedule 40 ABS Cellular Core DWV (Pipe) F628
Schedule 40 ABS (Pipe) D1527
Schedule 40 ABS (Fittings) D2468
ABS−DWV (Drain Waste & Vent)
(Pipe & Fittings) D2661
PVC−DWV (Drain Waste & Vent)
Pipe & Fittings) D2665
PRIMER & SOLVENT CEMENT ASTM
SPECIFICATION
PVC & CPVC Primer F656
PVC Solvent Cement D2564
CPVC Solvent Cement F493
ABS Solvent Cement D2235
PVC/CPVC/ABS All Purpose Cement For
Fittings & Pipe of the same material D2564, D2235, F493
ABS to PVC or CPVC Transition Solvent
Cement D3138
CANADA PIPE & FITTING & SOLVENT
CEMENT MARKING
PVC & CPVC Pipe and Fittings
ULCS636
PVC & CPVC Solvent Cement
ABS to PVC or CPVC Transition Cement
Table 4
Piping and Fittings Specifications

506788-01 Page 11 of 49
Issue 1130
The exhaust and intake connections are made of PVC.
Use PVC primer and solvent cement when using PVC
vent pipe. When using ABS vent pipe, use transitional
solvent cement to make connections to the PVC fitting in
the unit.
IMPORTANT
Use PVC primer and solvent cement or ABS solvent cement
meeting ASTM specifications, refer to Table 4. As an
alternate, use all purpose cement, to bond ABS, PVC, or
CPVC pipe when using fittings and pipe made of the same
materials. Use transition solvent cement when bonding ABS
to either PVC or CPVC.
Low temperature solvent cement is recommended during
cooler weather. Metal or plastic strapping may be used as
vent pipe hangers. Uniformly apply a liberal coat of PVC
primer for PVC or use a clean dry cloth for ABS to clean
inside socket surface of fitting and male end of pipe to depth
of fitting socket.
Canadian Applications Only
Pipe, fittings, primer and solvent cement used to vent
(exhaust) this appliance must be certified to ULC S636 and
supplied by a single manufacturer as part of an approved
vent (exhaust) system. When bonding the vent system to
the furnace, use ULC S636 approved One-Step Transition
Cement to bond the pipe to the flue collar. In addition, the
first three feet of vent pipe from the furnace flue collar must
be accessible for inspection.
Table 5 Lists the available exhaust termination kits. All vent
terminations are PVC.
Table 5
Outdoor Termination Kits Usage
A95DF2V
95G2DFV
VENT
PIPE
DIA.
(in.)
STANDARD CONCENTRIC
Outdoor
Exhaust
Accelerator
(Dia. X
Length)
Outdoor
Exhaust
Accelerator
(Dia. X
Length)
Flush-
Mount
Kit
1−1/2"
Concentric
Kit
2"
Concentric
Kit
3"
Concentric
Kit
1−1/2" X 12" 2" X 12" 51W11**
71M80
or
44W92
69M29
or
44W92
60L46
or
045
2 YES YES YES
2−1/2 YES YES YES
3 YES YES YES
070
2 YES YES YES
2−1/2 YES YES YES
3 YES YES YES
090
2YES YES YES YES
2−1/2 YES YES YES YES
3 YES YES YES YES
110
2YES YES YES YES
2−1/2 YES YES YES YES
3 YES YES YES YES
*Requires eld−provided and installed 1−1/2" exhaust accelerator.
** Kit 51W11 is provided with a 1−1/2" accelerator which must be used for all 045 and 070 furnace installations.
†† The 44W92 Concentric kit is provided with a 1-1/2” accelerator which must be installed on the exhaust outlet when
this kit is used with the 045 and 070 furnaces.
44W93
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506788-01Page 12 of 49 Issue 1130
Joint Cementing Procedure
All cementing of joints should be done according to the
specifications outlined in ASTM D 2855.
1. Measure and cut vent pipe to desired length.
2. Debur and chamfer end of pipe, removing any ridges or
rough edges. If end is not chamfered, edge of pipe
may remove cement from fitting socket and result in a
leaking joint.
3. Clean and dry surfaces to be joined.
4. Test fit joint and mark depth of fitting on outside of pipe.
5. Uniformly apply a liberal coat of PVC primer for PVC or
use a clean dry cloth for ABS to clean inside socket
surface of fitting and male end of pipe to depth of fitting
socket.
6. Promptly apply solvent cement to end of pipe and inside
socket surface of fitting. Cement should be applied
lightly but uniformly to inside of socket. Take care to
keep excess cement out of socket. Apply second coat
to end of pipe.
NOTE: Time is critical at this stage. Do Not allow Primer to
dry before applying cement.
7. Immediately after applying last coat of cement to pipe,
and while both inside socket surface and end of pipe
are wet with cement, forcefully insert end of pipe into
socket until it bottoms out. Turn PVC pipe 1/4 turn during
assembly (but not after pipe is fully inserted) to distribute
cement evenly. Do not turn ABS or cellular core pipe.
NOTE: Assembly should be completed within 20 seconds
after last application of cement. Hammer blows should not
be used when inserting pipe.
8. After assembly, wipe excess cement from pipe at end
of fitting socket. A properly made join will show a bead
around its entire perimeter. Any gaps may indicate an
improper defective assembly due to insufficient solvent.
9. Handle joints carefully until completely set.
NOTE: A sheet metal screw may be used to secure the
intake pipe to the connector, if desired. Use a drill or self
tapping screw to make a pilot hole.
Venting Practices
Piping Suspension Guidelines
Figure 13
* See Table 4 for allowable pipe.
NOTE: Isolate piping at the point where it exits the outside wall or
roof in order to prevent transmission of vibration to the structure.
SCHEDULE 40
PVC − 5’
all other pipe* − 3’
Wall edistuoedisni
24" maximum
3/4" minimum
Wall Thickness Guidelines
insulation
(if required)
Figure 14
CHIMNEY
OR GAS
VENT
(Check sizing
for remaining
appliance)
FURNACE
(Removed from
from common
vent system)
WATER
HEATER
OPENINGS
(To Adjacent
Room)
REPLACING FURNACE THAT
WAS PART OF A COMMON
VENT SYSTEM
If this gas furnace replaces a furnace which was
commonly vented with another gas appliance,
the size of the existing vent pipe for that gas appliance
must be checked. Without the heat of the original
furnace flue products, the existing vent pipe is
probably oversized for the single water heater or
other appliance. The vent should be checked for
proper draw with the remaining appliance.
DANGER OF EXPLOSION!
Fumes from PVC glue may ignite during system check.
Allow fumes to dissipate for at least 5 minutes before
placing unit into operation.
DANGER

506788-01 Page 13 of 49
Issue 1130
Vent Piping Guidelines
This gas furnace can be installed as either a Non-Direct
Vent or a Direct Vent gas central furnace.
NOTE: In non-Direct Vent installations, combustion air is
taken from indoors and flue gases are discharged outdoors.
In Direct Vent installations, combustion air is taken from
outdoors and flue gases are discharged outdoors.
Intake and exhaust pipe sizing - Size pipe according to
Tables 6 and 7. Table 6 lists the minimum vent pipe lengths
permitted. Table 7 lists the maximum pipe lengths permitted.
Regardless of the diameter of pipe used, the standard roof
and wall terminations described in section Exhaust Piping
Terminations should be used. Exhaust vent termination pipe
is sized to optimize the velocity of the exhaust gas as it exits
the termination.
1. In areas where piping penetrates joist or interior walls,
hole must be large enough to allow clearance on all
sides of pipe through center of hole using a hanger.
2. When furnace is installed in a residence where unit is
shut down for an extended period of time, such as a
vacation home, make provisions for draining condensate
collection trap and lines.
Exhaust Piping
Route piping to outside of structure. Continue with
installation following instructions given in piping termination
section.
The exhaust vent pipe operates under positive pressure
and must be completely sealed to prevent leakage of
combustion products into the living space.
Do not discharge exhaust into an existing stack or stack
that also serves another gas appliance. If vertical
discharge through an existing unused stack is required,
insert PVC pipe inside the stack until the end is even
with the top or outlet end of the metal stack.
CAUTION
CAUTION
Do not use screens or perforated metal in exhaust or
intake terminations. Doing so will cause freeze-ups and
may block the terminations.
IMPORTANT
Table 6
MINIMUM VENT PIPE LENGTHS
A95DF2V & 95G2DFV
MODELS MIN. VENT LENGTH*
045, 070, 090, 110
15 ft. or
5 ft plus 2 elbows or
10 ft plus 1 elbow
*Any approved termination may be added to the minimum length listed.
Use the following steps to correctly size vent pipe diameter.
Figure 15
1
2
3
4
5
6
045, 070,
090, 110
Which termination?
Standard or
Concentric?
See Table 5
Intake or
exhaust
Which needs
most elbows?
How many?
2", 2 1/2"
or 3"
Desired pipe size?
Use Table 7 to nd
max intake or exhaust
pipe length.
What is the altitude?
7
Furnace capacity?
In some applications which permit the use of several different
sizes of vent pipe, a combination vent pipe may be used.
Contact Allied Air Technical Service for assistance in sizing
vent pipe in these applications.

506788-01Page 14 of 49 Issue 1130
A95DF2V & 95G2DFV
Table 7
Maximum Allowable Intake or Exhaust Vent Length in Feet
Standard Termination at Elevation 0 í4500 ft.
Number
Of 90°
Elbows
Used
2" Pipe í Pipe 3" Pipe
Model Model Model
045 070 090  045 070 090  045 070 090 110
166 51 29
n/a
100 78
n/a
123 122 103
261 46 24
100
95 73 118 117 98
103
356 41 19
95
90 68 113 112 93
98
451 36
n/a
90
85 63 108 107 88
93
546 31
85
80 58 103 102 83
88
641 26
80
75 53 98 97 78
83
736 21
75
70 48 93 92 73
78
831 16
70
65 88 87 68
73
926
65
60 83 82 63
68
10 21
60
55 78 77 58
63
Standard Termination Elevation  í ft.
Number
Of 90°
Elbows
Used
2" Pipe í Pipe 3" Pipe
Model Model Model
045 070 090  045 070 090  045 070 090 
1 66 51 29
n/a
100
77 58 58
2 61 46 24 95
100 78 123 122 103 103
3 56 41 19 90
95 73 118 117 98 98
4 51 36
n/a
85
90 68 113 112 93 93
5 46 31 80
85 63 108 107 88 88
6 41 26 75
80 58 103 102 83 83
7 36 70
75 98 97 78 78
8 31 65
70 93 92 73 73
9 26 60
65 88 87 68 68
10 21 55
60 83 82 63 63
14
9
43
38
33
43
38
33
28
8
13
23
18
11
21
16
14
9
53
48
43
38
43
38
33
28
23
18
13
8
11
655 58
n/a 55 33
n/a
78
*Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.
9

506788-01 Page 15 of 49
Issue 1130
A95DF2V & 95G2DFV
Table 7
Maximum Allowable Intake or Exhaust Vent Length in Feet
*Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.
Concentric Termination at Elevation 0 í4500 ft.
Number
Of 90°
Elbows
Used
2" Pipe í Pipe 3" Pipe
Model Model Model
045 070 090  045 070 090  045 070 090 110
1 58 43 27
n/a
74
n/a
106 106 99 99
2 53 38 22 69 101 101 94 94
3 48 33 17 64 96 96 89 89
4 43 28
n/a
90 90
59 91 91 84 84
5 38 23
85 85
54 86 86 79 79
6 33 18
80 80
49 81 81 74 74
7 28 13
75 75
44 76 76 69 69
823
70 70
71 71 64 64
9 18 n/a
65 65
66 66 59 59
10 13
60 60
61 61 54 54
&RQFHQWULF7HUPLQDWLRQDW(OHYDWLRQ ft.
Number
Of 90°
Elbows
Used
2" Pipe í Pipe 3" Pipe
Model Model Model
045 070 090  045 070 090  045 070 090 
1 58 43 27
n/a
90 90 74 106 106 99 99
2 53 38 22 85 85 69 101 101 94 94
3 48 33 17 80 80 64 96 96 89 89
4 43 28
n/a
75 75 59 91 91 84 84
5 38 23 70 70 54 86 86 79 79
6 33 18 65 65 49 81 81 74 74
7 28 60 76 76 69 69
8 23 55 55 71 71 64 64
9 18 50 50 66 66 59 59
10 13 45 45 61 61 54 54
12
7
7
39
34
29
39
34
29
24
9
19
14
13
8
12
7
44
39
34
29
39
34
29
24
19
14
9
55
50
45
55
50
45
n/a n/a
60

506788-01Page 16 of 49 Issue 1130
Typical Exhaust Pipe Connections
TRANSITION
2” 2”
2”
3”
Pipe size determined in Table 7.
2”
2”
or
DO NOT transition from smaller
to larger pipe size in horizontal
runs of exhaust pipe.
TOP VIEW
EXHAUST
INTAKE
* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.
NOTE: Exhaust pipe and intake pipe must be the same diameter.
*2”
Figure 16
Figure 17
Typical Intake Pipe Connections (Direct Vent Applications)
2” 2”
TRANSITION
2”
3”
TRANSITION
3”
Pipe size determined in Table 7.
2”
2”
or
TOP VIEW
EXHAUST
INTAKE
* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.
NOTE: Intake pipe and exhaust pipe must be the same diameter.
*2”
*2”
*2”

506788-01 Page 17 of 49
Issue 1130
Intake Piping
This furnace may be installed in Direct Vent applications,
only.
Follow the next two steps when installing the unit in Direct
Vent applications, where combustion air is taken from
outdoors and flue gases are discharged outdoors. The
provided air intake screen must not be used in direct
vent applications (outdoors).
1. Use cement or a sheet metal screw to secure the intake
pipe to the inlet air connector.
2. Route piping to outside of structure. Continue with
installation following instructions given in general guide
lines for piping terminations and intake and exhaust
piping terminations for direct vent sections. Refer to
Table 7 for pipe sizes.
General Guidelines for Vent Terminations
In Direct Vent applications, combustion air is taken from
outdoors and the flue gases are discharged to the outdoors.
This unit is then classified as a direct vent, Category IV gas
furnace.
In Direct Vent applications, the vent termination is limited
by local building codes. In the absence of local codes, refer
to the current National Fuel Gas Code ANSI Z223-1/NFPA
54 in U.S.A., and current CSA-B149 Natural Gas and
Propane Installation Codes in Canada for details.
Position termination according to location given in Figure
18. In addition, position termination so it is free from any
obstructions and 12" above the average snow accumulation.
At vent termination, care must be taken to maintain protective
coatings over building materials (prolonged exposure to
exhaust condensate can destroy protective coatings). It is
recommended that the exhaust outlet not be located within
6 feet (1.8 m) of a condensing unit because the condensate
can damage the painted coating.
NOTE: If winter design temperature is below 32° F (0° C), it
is recommended that the exhaust piping be insulated with
1/2" (13 mm), Armaflex or equivalent when run through an
unconditioned area. In extremely cold climate areas with
temperature below 20° F (6.7° C) it is recommended that 3/
4" (19 mm) Armaflex or equivalent be used. Insulation on
outside runs of exhaust pipe may be painted or wrapped to
protect insulation from deterioration in accordance with the
insulation manufacturers recommendation. Exhaust pipe
insulation may not be necessary in some specific
applications.
Do not use screens or perforated metal in exhaust
terminations. Doing so will cause freeze-ups and may
block the terminations.
IMPORTANT
For Canadian Installations Only:
In accordance to CSA International B149 installation
codes, the minimum allowed distance between the
combustion air intake inlet and the exhaust outlet of
other appliances shall not be less than 12 inches (305
mm).
IMPORTANT
NOTE: During extremely cold temperatures, below
approximately 20° F (6° C), units with long runs of vent pipe
through unconditioned space, even when insulated, may
form ice in the exhaust termination that prevents the unit
from operating properly. Longer run times of at least 5
minutes will alleviate most icing problems. Also, a heating
cable may be installed on exhaust piping and termination to
prevent freeze-ups. Heating cable installation kits are
available, see unit specification sheets for part numbers.

506788-01Page 18 of 49 Issue 1130
Figure 18
Vent Termination Clearances
For Direct Vent installations in the USA and Canada
K
D
E
L
B
C
F
G
A
B
J
A
M
I
H
INSIDE CORNER
DETAIL
VENT TERMINAL AIR SUPPLY INLET AREA WHERE TERMINAL
IS NOT PERMITTED
Fixed
Closed
Operable
B
Fixed
Closed
Operable
B
B
A =
B =
C =
D =
E =
F =
G =
H =
I =
J =
K =
L =
M =
US Installations 1Canadian Installations 2
12 inches (305 mm) or 12 in. 305 mm)
above average snow accumulation.
12 inches (305 mm) or 12 in. 305 mm)
above average snow accumulation.
Clearance above grade, veranda,
porch, deck or balcony
Clearance to window or
door that may be opened
6 inches (152 mm) for appliances <10,000
Btuh (3kw), 9 inches (mm) for appliances
> 10,000 Btuh (3kw) and <50,000 Btuh
(15 kw), 12 inches (305 mm) for ap-
pliances > 50,000 Btuh (15kw)
6 inches (152 mm) for appliances <10,000
Btuh (3kw), 12 inches (305 mm) for
appliances > 10,000 Btuh (3kw) and
<100,000 Btuh (30kw), 36 inches (.9m)
for appliances > 100,000 Btuh (30kw)
Clearance to permanently
closed window
Vertical clearance to ventilated sot
located above the terminal within a
horizontal distance of 2 feet (mm)
from the center line of the terminal
Clearance to unventilated sot
Clearance to outside corner
Clearance to inside corner
Clearance to each side of center line ex-
tended above meter / regulator assembly
Clearance to service regulator
vent outlet
Clearance to non−mechanical air
supply inlet to building or the com-
bustion air inlet to any other ap-
pliance
Clearance to mechanical air sup-
ply inlet
Clearance above paved sidewalk or
paved driveway located on public property
Clearance under veranda, porch,
deck or balcony
* 12"
*
* 7 feet (2.1m)
3 feet (.9 m) within a height 15 feet (4.5 m)
above the meter / regulator assembly
3 feet (.9 m)
6 inches (152 mm) for appliances <10,000
Btuh (3kw), 9 inches (mm) for appliances
> 10,000 Btuh (3kw) and <50,000 Btuh
(15 kw), 12 inches (305 mm) for ap-
pliances > 50,000 Btuh (15kw)
6 inches (152 mm) for appliances <10,000
Btuh (3kw), 12 inches (305 mm) for
appliances > 10,000 Btuh (3kw) and
<100,000 Btuh (30kw), 36 inches (.9m)
for appliances > 100,000 Btuh (30kw)
3 feet (.9 m) above if within 10 feet
(3 m) horizontally
6 feet (1.8 m)
1
In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code
2
In accordance with the current CSA B149.1, Natural Gas and Prop ane Installation Code *For clearances not specied in ANSI Z223.1/NFPA 54 or CSA B149.1, clear-
ance will be in accordance with local installation codes and the requirements
of the gas supplier and these installation instructions."
between two single family dwellings and serves both dwellings.
sides beneath the oor. Lennox recommends avoiding this location if possible.
* 12"
* Equal to or greater than sot depth * Equal to or greater than sot depth* Equal to or greater than sot depth
* Equal to or greater than sot depth * Equal to or greater than sot depth
* No minimum to outside corner * No minimum to outside corner
3 feet (.9 m) within a height 15 feet (4.5 m)
above the meter / regulator assembly
3 feet (.9 m)
**

506788-01 Page 19 of 49
Issue 1130
Details of Intake and Exhaust Piping Terminations for
Direct Vent Installations
NOTE: In Direct Vent installations, combustion air is taken
from outdoors and flue gases are discharged to outdoors.
NOTE: Flue gas may be slightly acidic and may adversely
affect some building materials. If any vent termination is
used and the flue gases may impinge on the building
material, a corrosion-resistant shield (minimum 24 inches
square) must be used to protect the wall surface. If the
optional tee is used, the protective shield is required. The
shield should be constructed using wood, plastic, sheet metal
or other suitable material. All seams, joints, cracks, etc. in
the affected area should be sealed using an appropriate
sealant. See Figure 21.
Intake and exhaust pipes may be routed either horizontally
through an outside wall or vertically through the roof. In
attic or closet installations, vertical termination through the
roof is preferred. Figures 21 through 27 show typical
terminations.
1. Exhaust and intake exits must be in same pressure zone.
Do not exit one through the roof and one on the side.
Also, do not exit the intake on one side and the exhaust
on another side of the house or structure.
2. Intake and exhaust pipes should be placed as close
together as possible at termination end (refer to
illustrations). Maximum separation is 3" (76 mm) on
roof terminations and 6" (152 mm) on side wall
terminations.
3. On roof terminations, the intake piping should terminate
straight down using two 90° elbows (See Figure 27).
4. Exhaust piping must terminate straight out or up as
shown. A reducer may be required on the exhaust piping
at the point where it exits the structure to improve the
velocity of exhaust away from the intake piping. See
Table 8. 6. On field supplied terminations, a minimum distance
between the end of the exhaust pipe and the end of the
intake pipe without a termination elbow is 8" and a
minimum distance of 6" with a termination elbow. See
Figures 22 and 23.
7. If intake and exhaust piping must be run up a side wall
to position above snow accumulation or other
obstructions, piping must be supported every 24" (610
mm) as shown in Figures 22 and 23.
When exhaust and intake piping must be run up an
outside wall, the exhaust piping must be terminated with
pipe sized per Table 8. The intake piping may be
equipped with a 90° elbow turndown. Using turndown
will add 5 feet (1.5 m) to the equivalent length of the
pipe.
8. Based on the recommendation of the manufacturer, a
multiple furnace installation may use a group of up to
four terminations assembled together horizontally, as
shown in Figure 26
5. On field supplied terminations for side wall exit, exhaust
piping may extend a maximum of 12 inches (305 mm)
for 2" PVC and 20 inches (508 mm) for 3" (76 mm) PVC
beyond the outside wall. Intake piping should be as
short as possible. See Figures 22 and 23.
NOTE: Care must be taken to avoid recirculation of exhaust
back into intake pipe.
MODEL Exhaust Pipe Size Termination
Pipe Size
*045 and *070 2" (51mm), 2−1/2" (64mm),
3" (76mm)
1−1/2" (38mm)
*090 2" (51mm)
110 3" (76mm) 2" (51mm)
*045,070and090unitswiththeush−mounttermination
must use the 1−1/2"accelerator supplied with the kit.
Table 8
Exhaust Pipe Termination Size Reduction
Figure 19
Direct Vent Roof Termination Kit
UNCONDITIONED
ATTIC SPACE
1/2" (13mm) FOAM
INSULATION IN
UNCONDITIONED
SPACE
SIZE TERMINATION
PIPE PER TABLE 8.
3"(76mm) MAX.
12" (305mm) ABOVE
AVERAGE SNOW
ACCUMULATION
3" (76mm) OR
2" (51mm) PVC
PROVIDE SUPPORT
FOR INTAKE AND
EXHAUST LINES
8" (203mm) MIN
Inches(mm)
(15F75 or 44J41)
(IF REQUIRED)
Figure 20
Flush Mount Side Wall Termination
2" EXTENSION
FOR 2" PVC PIPE
1" EXTENSION
FOR 3" PVC PIPE
1−1/2" ACCELERATOR
(all −45, −070 and −090 units)
FURNACE
EXHAUST
PIPE
FURNACE
INTAKE PIPE
4’’
GLUE EXHAUST
END FLUSH INTO
TERMINATION
FLAT SIDE
51W11

506788-01Page 20 of 49 Issue 1130
Figure 21
C
A
E
D
B
A
BDD
B
C
A
C
12"
1
1
2
2
2" (51mm)
Vent Pipe
3" (76mm)
Vent Pipe
A− Clearance above
grade or average snow
accumulation
B−Horizontal
separation between
intake and exhaust
C−Minimum from
end of exhaust to
inlet of intake
D−Exhaust pipe length
E−Wall support distance
from top of each pipe
(intake/exhaust)
12" (508 mm) Min. 12" (508 mm) Min.
6" (152 mm) Min.
24" (610 mm) Max
9" (227 mm) Min.
12" (305 mm) Min.
16" (405 mm) Max.
6" (152 mm) Max.
6" (152 mm) Min.
24" (610 mm) Max
9" (227 mm) Min.
12" (305 mm) Min.
20" (508 mm) Max.
6" (152mm) Max.
1
The exhaust termination tee should be connected to the 2" or 3" PVC ue pipe as shown in the illustration. Do
not use an accelerator in applications that include an exhaust termination tee. The accelerator is not required.
2
As required. Flue gas may be acidic and may adversely aect some building materials. If a side wall vent
termination is used and ue gases will impinge on the building materials, a corrosion−resistant shield (24 inches
square) should be used to protect the wall surface. If optional tee is used, the protective shield is recom-
mended. The shield should be constructed using wood, sheet metal or other suitable material. All seams, joints,
cracks, etc. in aected area, should be sealed using an appropriate sealant.
3
Exhaust pipe 45° elbow can be rotated to the side away from the combustion air inlet to direct exhaust away
from adjacent property. The exhaust must never be directed toward the combustion air inlet.
Front View of
Intake and Exhaust
Intake Exhaust
3
Intake
Exhaust