Lennox EL195UHNE Series User manual
Page 1
INSTALLATION
INSTRUCTIONS
EL195UHNE
507758-05
03/2022
Supersedes 10/2021
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 man-
uals, be alert to the potential for personal injury or death.
IMPORTANT
DO NOT use the heat exchanger tubes to lift, drag or
pull the furnace to its installation location.
Doing so will damage the tubes causing noise and or
unsafe operation.
Heatexchanger Tubes
© 2022 Lennox Industries Inc.
Dallas, Texas USA
ELITE®SERIES GAS FURNACE
UPFLOW / HORIZONTAL AIR DISCHARGE
Contents
Unit Dimensions - inches (mm) ......................................2
EL195UHNE Gas Furnace .............................................3
Shipping and Packing List ..............................................3
Safety Information ..........................................................3
Use of Furnace as Construction Heater .........................4
General...........................................................................4
Combustion, Dilution & Ventilation Air ............................5
Shipping Bolt Removal ...................................................8
Installation - Setting Equipment......................................8
Filters............................................................................13
Duct System .................................................................13
...........................................14
Joint Cementing Procedure..........................................16
Venting Practices..........................................................16
Vent Piping Guidelines .................................................17
Gas Piping....................................................................36
Electrical.......................................................................39
Unit Start-Up.................................................................42
Gas Pressure Adjustment.............................................46
Proper Combustion.......................................................46
High Altitude Information ..............................................46
Testing for Venting and Combustion Air........................47
Service..........................................................................48
Repair Parts List...........................................................50
Start-Up & Performance Check List .............................51
Blower Data..................................................................53
Page 2
EL195UHNE Unit Dimensions - inches (mm)
AIR FLOW
23
(584)
(19)
3/4
(19)
1Bottom Return
Air Opening
GAS PIPING INLET
(Right Side Only)
Side Return
Air Opening
(Either Side)
1
Bottom Return
Air Opening
EXHAUST AIR
OUTLET
ELECTRICAL
INLET
(Either Side)
SUPPLY AIR
OPENING
FRONT VIEW SIDE VIEW
TOP VIEW
A
B9/16 (14)
C
3/4
27-3/4
(705)
19-7/16
(494)
23-1/2
(597)
1-1/2
(38)
6-1/2 (165)
(Either Side)
33
(838)
3-1/4
(83)
1-15/16 (49)
14
(356)
9/16
(14)
12-5/8
(321)
2OPTIONAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
16
(406)
14-3/4
(375)
2OPTIONAL
SIDE RETURN
AIR FILTER KIT
(Either Side)
5/8
(16)
1
3-1/4
(83)
23-3/4
(603)
25
(635)
1-1/2 (38)
Front Panel
COMBUSTION
AIR INTAKE
1-7/8 (48)
CONDENSATE
TRAP CONNECTION
(Either Side)
INTAKE AIR
2-1/4
(57)
2-7/8
(73)
6-5/8
(168)
Not Used
2
Optional Side Return Air Filter Kit is not for use
with the Optional Return Air Base.
1
NOTE - 60C size units that require air volumes over
1800 cfm must have one of the following:
1. Single side return air and Optional Return Air Base
with transition that must accommodate required
20 x 25 x 1 inch (508 x 635 x 25 mm) air filter to
maintain proper velocity.
2. Bottom return air.
3. Return air from both sides.
4. Bottom and one side return air.
See Blower Performance Tables for additional information.
Model A
in (mm)
B
in (mm)
C
in (mm)
EL195UH040NE36B
EL195UH060NE36B 17-1/2 (446) 16-3/8 (416) 16 (406)
EL195UH080NE48C
EL195UH100NE60C 21 (553) 19-7/8 (505) 19-1/2 (495)
Page 3
EL195UHNE Gas Furnace
The EL195UHNE Category IV gas furnace is shipped ready for
shipped with the bottom panel in place. The bottom panel must
applications with bottom return air.
The EL195UHNE can be installed as either a Direct
Vent or a Non-Direct Vent gas central furnace. The fur-
nace is equipped for installation in natural gas applications.
NOTE - In Direct Vent installations, combustion air is taken
from outdoors and ue gases are discharged outdoors. In
Non-Direct Vent installations, combustion air is taken from
indoors or ventilated attic or crawlspace and ue gases
are discharged outdoors. See FIGURE 1 and FIGURE 2
for applications involving roof termination.
DIRECT VENT INSTALLATION NON-DIRECT VENT
INSTALLATION
EXHAUST
OUTLET
COMBUSTION
AIR INTAKE OUTSIDE
OF HOUSE
COMBUSTION
AIR INTAKE
INSIDE
OF HOUSE
EXHAUST OUTLET
FIGURE 1
NON-DIRECT VENT
INSTALLATION
NON-DIRECT VENT
INSTALLATION
COMBUSTION
AIR INTAKE INSIDE
VENTILATED
CRAWL SPACE
COMBUSTION
AIR INTAKE INSIDE
VENTILATED
ATTIC SPACE
EXHAUST
OUTLET
EXHAUST
OUTLET
FIGURE 2
Shipping and Packing List
Package 1 of 1 contains
1 - Assembled EL195UHNE unit
1 - Bag assembly containing the following:
1 - Snap bushing
1 - 1/2” diameter threaded street elbow
1 - Snap plug
1 - Wire tie
1 - Condensate trap
1 - Condensate trap cap
1 - Condensate trap clamp
1 - 2” diameter debris screen
1 - 3/4” Threaded street elbow
damage, immediately contact the last carrier.
The following items may also be ordered separately:
1 - Thermostat
1 - Return air base kit
Safety Information
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 HVAC installer or
equivalent, service agency, or the gas supplier.
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
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/
installed in all LP applications.
Use only the type of gas approved for use with this fur-
nace. Refer to unit nameplate.
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 following address:
Page 4
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 stan-
dard.
Installation Locations
clearances to combustible material as listed on the unit
nameplate and in the table in FIGURE 12. Accessibility
protection clearances.
NOTE - For installation on combustible oors, the furnace
shall not be installed directly on carpeting, tile, or other
combustible material other than wood ooring.
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
physical damage by vehicles. When a furnace is installed
in a public garage, hangar, or other building that has a
-
cording 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 specied on the unit nameplate. Fail-
ure to do so may cause erratic limit operation and prema-
ture heat exchanger failure.
This EL195UHNE furnace must be installed so that its
electrical components are protected from water.
Installed in Combination with a Cooling Coil
NOTE - If a non-Lennox coil is used, consult the coil’s lit-
erature for the recommended distance from the top of the
furnace cabinet/heat exchanger.
When this furnace is used with cooling coils (FIGURE 3),
it shall be installed in parallel with, or on the upstream
side of, cooling coils to avoid condensation in the heating
prevent chilled air from entering the furnace. If the damp-
er 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 Elec-
tric Code, ANSI/NFPA No. 70. The National Electric Code
(ANSI/NFPA No. 70) is available from the following ad-
dress:
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.
Gas Unit
Heating Unit Installed Upstream of Cooling Coil
Gas Unit
Dampers
(open during heating operation only)
Dampers
(open during cooling operation only)
Heating Unit Installed Parallel to Air Handler Unit
Air Handler Unit
Cooling Coil
AIR FLOWAIR FLOW
AIR FLOW AIR FLOW
FIGURE 3
NOTE - This furnace is designed for a minimum continu-
ous 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.
The EL195UHNE furnace may be installed in alcoves,
closets, attics, basements, garages, crawl spaces and
-
mobile homes, recreational vehicles, or outdoors.
Use of Furnace as Construction Heater
Construction heat is not allowed with this furnace.
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 a EL195UHNE furnace:
• 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 ap-
plications, do not install the furnace where drafts
might blow directly into it. This could cause improp-
er combustion and unsafe operation.
• When the furnace is installed in non-direct vent ap-
plications, do not block the furnace combustion air
opening with clothing, boxes, doors, etc. Air is need-
ed for proper combustion and safe unit operation.
Page 5
• When the furnace is installed in an attic or other
insulated space, keep insulation away from the fur-
nace.
• When the furnace is installed in an unconditioned
space, consider provisions required to prevent
• Please consult the manufacturer of your evaporator
coil for their recommendations on distance required
between the heat exchanger and their drain pan.
Adequate space must be provided between the
drain pan and the furnace heat exchanger.
CAUTION
EL195UHNE unit should not be installed in areas
WARNING
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
Cements and glues
Antistatic fabric softeners for clothes dryers
Masonry acid washing materials
Combustion, Dilution & Ventilation Air
If the EL195UHNE is installed as a Non-Direct Vent
Furnace, follow the guidelines in this section.
NOTE - In Non-Direct Vent installations, combustion air is
taken from indoors or ventilated attic or crawlspace and
ue gases are discharged out-doors.
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, appli-
that could be used for combustion out of the house.
Unless outside air is brought into the house for combus-
tion, 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 poten-
tially dangerous situation.
In the absence of local codes concerning air for combus-
tion and ventilation, use the guidelines and procedures
in this section to install EL195UHNE furnaces to ensure
-
tion 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/NFPA 54). This reprinted material is not the com-
subject, which is represented only by the standard in its
entirety.
In Canada, refer to the CSA B149 installation codes.
Page 6
CAUTION
Do not install the furnace in a corrosive or contaminated
atmosphere. Meet all combustion and ventilation air
requirements, as well as all local codes.
unsafely. Enough air must be provided to meet the needs
of all fuel-burning appliances and appliances such as ex-
-
es, exhaust fans, or clothes dryers are used at the same
time as the furnace, much more air is required to ensure
-
cient air causes incomplete combustion which can result
in carbon monoxide.
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 com-
ponents.
The requirements for providing air for combustion and
ventilation depend largely on whether the furnace is in-
Unconned Space
large equipment room with a volume greater than 50 cubic
feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the com-
bined 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
for combustion if the structure does not provide enough air
construction with weather stripping and caulking around
the windows and doors, follow the procedures in the Air
from Outside section.
Conned Space
cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of
the combined input rating of all appliances installed in that
equipment rooms.
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
equipment room.
Even a small leak around the base of the unit at the plat-
form or at the return air duct connection can cause a po-
tentially dangerous negative pressure condition. Air for
combustion and ventilation can be brought into the con-
.Air from Inside
providing two permanent openings between the two spac-
es. Each opening must have a minimum free area of 1
square inch (645 mm2) per 1,000 Btu (.29 kW) per hour of
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 4.
EQUIPMENT IN CONFINED SPACE - ALL AIR FROM INSIDE
OPENINGS
(To Adjacent
Unconfined
Space)
NOTE - Each opening shall have a free area of at least one square inch
per 1,000 Btu (645mm2per .29kW) per hour of the total input rating of
all equipment in the enclosure, but not less than 100 square inches
(64516mm.
2).
ROOF TERMINATED
EXHAUST PIPE
SIDE WALL
TERMINATED
EXHAUST PIPE
(ALTERNATE
LOCATION)
FIGURE 4
Air from Outside
If air from outside is brought in for combustion and ventila-
-
nent openings. One opening shall be within 12” (305mm)
of the top of the enclosure and one within 12” (305mm) of
the bottom. These openings must communicate directly or
by ducts with the outdoors or spaces (crawl or attic) that
freely communicate with the outdoors or indirectly through
vertical ducts. Each opening shall have a minimum free
area of 1 square inch per 4,000 Btu (645mm2 per 1.17kW)
per hour of total input rating of all equipment in the en-
closure. When communicating with the outdoors through
area of 1 square inch per 2,000 Btu (645mm2 per .59kW)
per total input rating of all equipment in the enclosure (See
FIGURE 5).It is also permissible to bring in air for combus-
tion from a ventilated attic (FIGURE 6) or ventilated crawl
space (FIGURE 7).
Page 7
EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE
(Inlet Air from Crawl Space and Outlet Air to Outside)
NOTE-The inlet and outlet air openings shall each have a free area
of at least one square inch per 4,000 Btu (645mm2per 1.17kW) per
hour of the total input rating of all equipment in the enclosure.
OUTLET
AIR
INLET
AIR
VENTILATION
LOUVERS
(For unheated
crawl space)
FURNACE
ROOF TERMINATED
EXHAUST PIPE
VENTILATION LOUVERS
(Each end of attic)
SIDE WALL
TERMINATED
EXHAUST PIPE
(ALTERNATE
LOCATION)
FIGURE 5
EQUIPMENT IN CONFINED SPACE
(Inlet Air from Ventilated Attic and Outlet Air to Outside)
NOTE-The inlet and outlet air openings shall each have a free area
of at least one square inch per 4,000 Btu (645mm2per 1.17kW) per
hour of the total input rating of all equipment in the enclosure.
Ventilation Louvers
Inlet Air
(Minimum
12 in.(305mm) Above
attic floor)
Roof Terminated
Exhaust Pipe
Furnace
*Intake Debris
Screen
(Provided)
FIGURE 6
NOTE-The inlet and outlet air openings shall each have a free area
of at least one square inch per 4,000 Btu (645mm2per 1.17kW) per
hour of the total input rating of all equipment in the enclosure.
EQUIPMENT IN CONFINED SPACE
(Inlet Air from Ventilated Crawlspace and Outlet Air to Outside)
Roof Terminated
Exhaust Pipe
Furnace
Ventilation
Louvers
(Crawl space)
*Intake Debris Screen Provided)
Inlet Air
(Minimum
12 in.(305mm)
Above crawl
space floor)
Coupling or
3 in. to 2 in.
Transition
(Field Provided)
FIGURE 7
If air from outside is brought in for combustion and ventila-
-
ings. 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 commu-
nicate directly or by ducts with the outdoors or spaces
(crawl or attic) that freely communicate with the 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 5 and FIG-
URE 8. When communicating with the outdoors through
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 9.
When ducts are used, they shall be of the same cross-sec-
tional 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
must be considered. If the design and free area of protec-
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
equipment so that they.
Page 8
EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE
(All Air Through Ventilated Attic)
NOTE-The inlet and outlet air openings shall each have a free area of
at least one square inch per 4,000 Btu (645mm2per 1.17kW) per hour
of the total input rating of all equipment in the enclosure.
OUTLET
AIR
VENTILATION LOUVERS
(Each end of attic)
INLET AIR
(Ends 12” above
bottom)
ROOF TERMINATED
EXHAUST PIPE
SIDE WALL
TERMINATED
EXHAUST PIPE
(ALTERNATE
LOCATION)
FURNACE
FIGURE 8
EQUIPMENT IN CONFINED SPACE -
ALL AIR FROM OUTSIDE
OUTLET AIR
INLET AIR
NOTE-Each air duct opening shall have a free area of at least one
square inch per 2,000 Btu (645mm2per .59kW) per hour of the total
input rating of all equipment in the enclosure. If the equipment room
cate directly with the outdoors, each opening shall have a free area
of at least 1 square inch per 4,000 Btu (645mm2per 1.17kW) per
hour of the total input rating of all other equipment in the enclosure.
ROOF TERMINATED
EXHAUST PIPE
SIDE WALL
TERMINATED
EXHAUST PIPE
(ALTERNATE
LOCATION)
FURNACE
FIGURE 9
Shipping Bolt Removal
Units with 1/2 and 3/4 hp blower motor are equipped
-
er (rather than the rubber mounting grommet used with a
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.
RIGID LEG
remove shipping bolt and washe
Units with 1/2 or 3/4 HP Blower Motor
FIGURE 10
Installation - Setting Equipment
WARNING
Do not connect the return air duct to the back of the
the safety control devices, which could result in personal
injury or death.
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.
Upow Applications
The EL195UHNE gas furnace can be installed as shipped
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. The unit may be
positioned from level to ½” toward the front. See FIGURE
11. Allow for clearances to combustible materials as indi-
cated on the unit nameplate.
Page 9
SETTING EQUIPMENT
UPFLOW APPLICATION
HORIZONTAL APPLICATION
SIDE VIEW
FRONT VIEW END VIEW
UNIT
FRONT
AIR FLOW
UNIT
FRONT
1/2”
max.
1/2”
max.
AIR FLOW
Unit must be level side-to-side. Unit may be positioned from level to 1/2” toward the front to aid in draining.
Place level on the front blower
deck to check side to side
Place level on blower
deck screws to check
forward tilt
FIGURE 11
Page 10
WARNING
Improper installation of the furnace can result in personal
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
Fire, explosion, carbon monoxide poisoning, personal
injury and/or property damage could result.
Installation Clearances
Top
Bottom (Floor)
Left Side Right Side
Top/Plenum 1 in. (25 mm)
*Front 1
Back 1
Sides 1†
Vent 1
Floor 0‡
*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.
‡For installations on a combustible floor, do not install the furnace
directly on carpeting, tile or other combustible materials other
than wood flooring.
FIGURE 12
Return Air Guidelines
Return air can be brought in through the bottom or either
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.
Refer to Engineering Handbook for additional information.
EL195UHNE applications which include side return
air and a condensate trap installed on the same side
of the cabinet (trap can be installed remotely within 5
ft.) require either a return air base or eld-fabricated
transition to accommodate an optional IAQ accessory
taller than 14.5”. See FIGURE 13.
Side Return Air
(with transition and filter)
Return
Air
Plenum
Transition
20” X 25” X 1”
(508mmX635mmX 25mm)
Air Filter
FIGURE 13
Page 11
Optional Return Air Base
(Upflow Applications Only)
NOTE- Optional side return air filter kits are not for use with return air base.
1Both 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 field. 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.
FRONT VIEW
1Unit side return air
Opening
SIDE VIEW
3−1/4
(83)
1
23 (584)
Overall
(Maximum)
(584)
23
3/4
(19)
122−7/16
(570)
Overall
(Maximum)
SIDE RETURN
AIR OPENINGS
(Either Side)
5−5/8
(143)
1Minimum
11 (279)
2Maximum
14 (356)
(683)
26−7/8
7−1/4
(184)
FURNACE
FRONT
AIR FLOW
IF BASE
IS USED
WITHOUT
IAQ CABINET,
A SINGLE
RETURN AIR
PLENUM
MUST
COVER BOTH
UNIT AND
RETURN
AIR BASE
OPENINGS
INDOOR AIR
QUALITY
CABINET
(PCO, Filter
Cabinet, etc.)
AIR BASE
OPTIONAL
RETURN
CONDENSATE
TRAP
17−1/2 (446) B Width (50W98)
21 (533) C Width (50W99)
24−1/2 (622) D Width (51W00)
FIGURE 14
Removing the Bottom Panel
Screw
Bottom Panel
Bottom Cap
FIGURE 15
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 15.
Horizontal Applications
WARNING
Do not install the furnace on its front or back. See
FIGURE 16.
See figure 4.
Front Back
FIGURE 16
Page 12
applications with either right- or left-hand air discharge.
-
tions
.
Horizontal Application
Installation Clearances
dnEthgiRdnEtfeL
Right-Hand Discharge
Left-Hand Discharge
Top
Bottom (Floor)**
Bottom (Floor)**
dnEthgiRdnEtfeL
Air
Flow
Air
Flow
Air
Flow
Air
Flow
Top 1
Front* 1
Back 1
Ends 1
Vent 1
Floor 1‡
*Front clearance in alcove installation must be 24 in. (610 mm).
Maintain a minimum of 24 in. (610 mm) for front service access.
**An 8” service clearance must be maintained below the unit to
provide for servicing of the condensate trap.
‡For installations on a combustible floor, do not install the furnace
directly on carpeting, tile or other combustible materials other
than wood flooring.
FIGURE 17
Suspended Installation of Horizontal Unit
This furnace may be installed in either an attic or a crawl-
space. Either suspend the furnace from roof rafters or
-
pension kit (51W10) may be ordered from Lennox or use
equivalent.
NOTE - Heavy-gauge sheet metal straps may be used to
suspend the unit from roof rafters or ceiling joists. 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 sup-
ported separately.
HORIZONTAL SUSPENSION KIT
Bracket
(typical)
Metal Strap
(typical)
Air
Flow
Internal Brace
(provided with kit)
FIGURE 18
NOTE - When the furnace is installed on a platform or with
the horizontal suspension kit in a crawlspace, it must be
elevated enough to avoid water damage, accommodate
drain trap and to allow the evaporator coil to drain.
Platform Installation of Horizontal Unit
1 - Select location for unit keeping in mind service and
other necessary clearances. See FIGURE 17.
2 - Construct a raised wooden frame and cover frame
with a plywood sheet. If unit is installed above
installed under unit. Set unit in drain pan as shown
in FIGURE 19. Leave 8 inches for service clearance
below unit for condensate trap.
3 - Provide a service platform in front of unit. When
installing the unit in a crawl space, a proper support
platform may be created using cement blocks.
4 - Route auxiliary drain line so that water draining from
this outlet will be easily noticed by the homeowner.
5 - Ifnecessary, runthecondensate lineintoa condensate
pump to meet drain line slope requirements. The
pump must be rated for use with condensing
furnaces. Protect the condensate discharge line
6 - Continue with exhaust, condensate and intake piping
installation according to instructions.
Page 13
*Gas connector may be
used for Canadian
able by local authority
having jurisdiction.
*GAS CONNECTION
RAISED
PLATFORM
SERVICE PLATFORM
INTAKE PIPE
EXHAUST PIPE
FIGURE 19
Return Air -- Horizontal Applications
Return air may be brought in only through the end of a
equipped with a removable bottom panel to facilitate in-
stallation. See FIGURE 15.
Filters
-
IMPORTANT
and performance may be reduced The pressure drop
may also cause the limit to trip more frequently during
resulting in an increase in the number of service calls.
the data given in the appropriate Lennox Product
in Service and Application Note ACC002 (August 2000).
TABLE 1
Furnace
Cabinet Width
Side Return Bottom Return
17-1/2” 16 X 25 X 1 (1) 16 X 25 X 1 (1)
21” 16 X 25 X 1 (1) 20 X 25 X 1 (1)
Duct System
supply and return air duct system. FIGURE 20 shows the
correct supply and return duct installation. Refer to ACCA
Manual D. This will result in a quiet and low-static system
that has uniform air distribution.
NOTE - This furnace is not certied for operation in heat-
ing mode (indoor blower operating at selected heating
speed) with an external static pressure which exceeds 0.5
inches w.c. Operation at these conditions may result in
improper limit operation.
Supply Air Plenum
If the furnace is installed without a cooling coil, a remov-
able access panel should be installed in the supply air
duct. The access panel should be large enough to per-
mit inspection of the heat exchanger. The furnace access
panel must always be in place when the furnace is oper-
-
stall self tapping screws in the three evaporator coil screw
to the vestibule panel.
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 de-
vice (i.e., wood replace) 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
pulled back down the vent pipe and into the room. This
-
bustion and the formation of carbon monoxide gas. This
raw gas or toxic fumes might then be distributed through-
out the house by the furnace duct system.
Return air can be brought in through the bottom or either
side of the furnace (return air brought into either side of
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
-
lent sealing method between the plenum and the furnace
Page 14
HORIZONTAL UNIT
SUPPLY
AIR
SUPPLY
AIR Install self tapping screws
to seal any potential air
leaks
UPFLOW UNIT
FIGURE 20
Pipe & Fittings Specications
with American National Standard Institute and the Ameri-
can Society for Testing and Materials (ANSI/ASTM) stan-
lumps, undissolved particles or any foreign matter that
of the cement. The cement shall show no gelation, strati-
materials.
CAUTION
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
vapors. Avoid contact of cement with skin and eyes.
IMPORTANT
EL195UHNE 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
TABLE 2
PIPING AND FITTINGS SPECIFICATIONS
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
TABLE 2 Continued
PIPING AND FITTINGS SPECIFICATIONS
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 D3188
PVC & ABS & NORYL Transition Solvent
Cement WELD-ON 4052
CANADA PIPE & FITTING & SOLVENT
CEMENT MARKING
PVC & CPVC Pipe and Fittings
ULCS636
PVC & CPVC Solvent Cement
ABS to PVC or CPVC Transition Cement
POLYPROPYLENE VENTING SYSTEM
PolyPro® by Duravent
InnoFlue® by Centrotherm
UL 1738 CERTIFIED GAS VENTING SYSTEM
IPEX System1738 Schedule 40 PVC Pipes
and Fittings UL1738
IPEX System1738 PVC FGV Cement &
Primer
Page 15
Use PVC primer and solvent cement or ABS solvent ce-
alternate, use all purpose cement, to bond ABS, PVC, or
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 for
vent pipe hangers. Uniformly apply a liberal coat of PVC
primer for PVC or use a clean dry cloth for ABS to clean
-
vent cement used to vent (exhaust) this appliance must
-
facturer as part of an approved vent (exhaust) system. In
NOTE - The intake coupling on the furnace is ABS mate-
rial. Use transitional solvent to make connections to PVC
pipe.
NOTE - Vent pipe must be installed with provided vent
adapter. See FIGURE 23.
TABLE 3
OUTDOOR TERMINATION USAGE*
Vent Pipe
Dia. in.
STANDARD CONCENTRIC
Flush Mount
Kit
Wall Kit
Field
Fabricated
1-1.2 inch 2 inch 3 inch
2 inch 3 inch 71M80 (US)
444W92
(CA)
69M29 (US)
444W92
(CA)
60L46 (US)
444W93
(CA)
51W11 (US)
51W12
(CA)
22G44 (US)
430G28 (CA)
44J40 (US)
481J20 (CA)
040 23YES YES 1YES 5YES 2YES
33YES YES 1YES 5YES 2YES
060 23YES YES 1YES 5YES 2YES
33YES YES 1YES 5YES 2YES
080 23YES YES 5YES YES YES
33YES YES 5YES YES YES
100 2 YES YES 5YES YES YES
3 YES YES 5YES YES YES
NOTE - Standard Terminations do not include any vent pipe or elbows external to the structure. Any vent pipe or elbows external to the structure must be included in total
vent length calculations. See vent length tables.
* Kits must be properly installed according to kit instructions.
2Concentric kits 71M80 and 44W92 include 1-1/2” outdoor accelerator, when uses with 040 and 060 input models.
3 Flush mount kits 51W11 and 51W12 includes 1-1/2 in. outdoor exhaust accelerator, required when used with 040, 060 and 080 input models.
5 See table 8 for vent accelerator requirements.
Page 16
Joint Cementing Procedure
All cementing of joints should be done according to the
DANGER
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.
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
a leaking joint.
NOTE - Check the inside of vent pipe thoroughly for
any obstruction that may alter furnace operation.
3 - Clean and dry surfaces to be joined.
pipe.
5 - Uniformly apply a liberal coat of PVC primer for PVC
or use a clean dry cloth for ABS to clean inside socket
NOTE - Time is critical at this stage. Do not allow
primer to dry before applying cement.
6 - Promptly apply solvent cement to end of pipe and
applied lightly but uniformly to inside of socket. Take
care to keep excess cement out of socket. Apply
second coat to end of pipe.
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
a bead around its entire perimeter. Any gaps may
solvent.
9 - Handle joints carefully until completely set.
Venting Practices
* See Piping and Fittings Specifications table
Piping Suspension Guidelines
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
FIGURE 21
1 - In areas where piping penetrates joists 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.
Page 17
If replacing 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.
REPLACING FURNACE THAT WAS PART OF A
COMMON VENT SYSTEM
CHIMNEY
OR GAS
VENT
(Check sizing
for water
heater only)
FURNACE
(Replaced)
WATER
HEATER
OPENINGS
(To Adjacent
Room)
FIGURE 22
Exhaust Piping (FIGURE 23, FIGURE 26 and FIGURE
27)
The vent adapter must be attached to the exhaust cou-
pling on the furnace top panel. Use provided bands. See
steps below.
1 - Remove the caution tag from vent adapter.
2 - Fully insert vent adapter with both bands loosely
attached on the furnace exhaust coupling
3 - Insert PVC exhaust pipe through vent adapter. Ensure
vent pipe is fully seated into exhaust coupling.
4 - Tighten both top and bottom bands to 40in-lbs.
NOTE - PVC / ABS / NORYL transition solvent cement
WELD-ON 4052 (or equivalent) must be used for con-
necting PVC exhaust pipe to NORYL furnace exhaust
coupling.
Route piping to outside of structure. Continue with instal-
lation following instructions given in piping termination
section.
CAUTION
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
The exhaust vent pipe operates under positive pressure
and must be completely sealed to prevent leakage of
combustion products into the living space.
Furnace
Top Band
(torque to 40in-lbs)
PVC
Exhaust Pipe
Top Panel
Flue Coupling To Exhaust Coupling
Bottom Band
(torque to 40in-lbs)
Flue Couplig
Furnace
Exhaust Coupling
FIGURE 23
Vent Piping Guidelines
NOTE - Lennox has approved the use of DuraVent® and
Centrotherm manufactured vent pipe and terminations as
an option to PVC. When using the PolyPro® by DuraVent
or InnoFlue® by Centrotherm venting system the vent
pipe requirements stated in the unit installation instruc-
tion – minimum & maximum vent lengths, termination
clearances, etc. – apply and must be followed. Follow the
instructions provided with PoyPro by DuraVent and Inno-
Flue by Centrotherm venting system for assembly or if re-
quirements are more restrictive. The PolyPro by Duravent
and InnoFlue by Centrotherm venting system must also
follow the uninsulated and unconditioned space criteria
listed in TABLE 7.
The EL195UHNE can be installed as either a Non-Di-
rect Vent or a Direct Vent gas central furnace.
NOTE - In Non-Direct Vent installations, combustion air
is taken from indoors and ue gases are discharged out-
doors. In Direct Vent installations, combustion air is taken
from outdoors and ue gases are discharged outdoors.
Intake and exhaust pipe sizing - -
ing to TABLE 4 and TABLE 5. Count all elbows inside
and outside the home. TABLE 4 lists the minimum vent
pipe lengths permitted. TABLE 5 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.
-
locity of the exhaust gas as it exits the termination. Refer
to TABLE 8.
In some applications which permit the use of several dif-
used. Contact Lennox’ Application Department for assis-
Page 18
NOTE - The exhaust collar on all models is sized to ac-
commodate 2” Schedule 40 vent pipe. In horizontal ap-
plications, any transition to exhaust pipe larger than 2”
must be made in vertical runs of the pipe. Therefore a 2”
elbow must be added before the pipe is transitioned to
any size larger than 2”. This elbow must be added to the
elbow count used to determine acceptable vent lengths.
Contact the Application Department for more information
concerning sizing of vent systems which include multiple
pipe sizes.
Horizontal Installation Offset Requirements
NOTE -
ward unit. A minimum of 1/4” (6mm) drop for each 12” (305mm)
of horizontal run is mandatory for drainage.
NOTE - Exhaust piping should be checked carefully to make
sure there are no sags or low spots.
Exhaust Pipe
Horizontal
Gas Furnace
12” Min.
12” Max.
FIGURE 24
TABLE 4
MINIMUM VENT PIPE LENGTHS
EL195UH Model MIN. VENT LENGTH*
040, -060, -080, 100 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. Two 45 degree elbows are equivalent to one 90
degree elbow.
-
eter.
1
2
3
4
5
6
Which style termination
being used?
Standard or concentric?
See table 3..
Which needs
most elbows?
Intake or
exhaust?
How many elbows?
Count all elbows inside
and outside house.
Desired pipe size?
2” or 3”
Use table 5 or 6 to find
max intake or exhaust pipe
length. Includes all vent
pipe and elbows inside and
outside the house.
What is the altitude of
the furnace installation?
7
What is the
furnace capacity?
040, 060, 080, or
100?
Pipe Size Process
FIGURE 25
CAUTION
Do not use screens or perforated metal in exhaust or
may block the terminations.
Page 19
TABLE 5
NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent
length calculation.
Standard Termination at Elevation 0 - 4500 ft
Number Of
90° Elbows
2” Pipe 3” Pipe
Model Model
040 060 080 100 040 060 080 100
1 81 66 44 24 138 137 118 118
2 76 61 39 19 133 132 113 113
3 71 56 34 14 128 127 108 108
4 66 51 29
n/a
123 122 103 103
5 61 46 24 118 117 98 98
6 56 41 19 113 112 93 93
7 51 36 14 108 107 88 88
8 46 31
n/a
103 102 83 83
9 41 26 98 97 78 78
10 36 21 93 92 73 73
Concentric Termination at Elevation 0 - 4500 ft
Number Of
90° Elbows
2” Pipe 3” Pipe
Model Model
040 060 080 100 040 060 080 100
1 73 58 42 22 121 121 114 114
2 68 53 37 17 116 116 109 109
3 63 48 32 12 111 111 104 104
4 58 43 27
n/a
106 106 99 99
5 53 38 22 101 101 94 94
6 48 33 17 96 96 89 89
7 43 28 12 91 91 84 84
8 38 23
n/a
86 86 79 79
9 33 18 81 81 74 74
10 28 13 76 76 69 69
Page 20
TABLE 5 Continued
NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent
length calculation.
Standard Termination at Elevation 4501 - 7500 ft
Number Of
90° Elbows
2” Pipe 3” Pipe
Model Model
040 060 080 100 040 060 080 100
1 81 41 34
n/a
138 105 100 65
2 76 36 29 133 100 95 60
3 71 31 24 128 95 90 55
4 66 26 19 123 90 85 50
5 61 21 14 118 85 80 45
6 56 16 9 113 80 75 40
7 51 11
n/a
108 75 70 35
8 46
n/a
103 70 65 30
9 41 98 65 60 25
10 36 93 60 55 20
Concentric Termination at Elevation 4501 - 7500 ft
Number Of
90° Elbows
2” Pipe 3” Pipe
Model Model
040 060 080 100 040 060 080 100
1 73 33 32
n/a
121 89 89 61
2 68 28 27 116 84 84 56
3 63 23 22 111 79 79 51
4 58 18 17 106 74 74 46
5 53 13 12 101 69 69 41
6 48
n/a n/a
96 64 64 36
7 43 91 59 59 31
8 38 86 54 54 26
9 33 81 49 49 21
10 28 76 44 44 16
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