Lennox International Inc Furnace EL296UHE User Manual

INSTALLATION

INSTRUCTIONS

EL296UHE

E 2013 Lennox Industries Inc.

Dallas, Texas, USA

ELITE SERIES GAS FURNACE

UPFLOW / HORIZONTAL AIR DISCHARGE

507067-01

02/2013

Supersedes 01/2012

Litho U.S.A.

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

This is a safety alert symbol and should never be ignored.

When you see this symbol on labels or in manuals, be alert

to the potential for personal injury or death.

WARNING

Improper installation, adjustment, alteration, service

or maintenance can cause property damage, person-

al injury or loss of life. Installation and service must

be performed by a licensed professional installer (or

equivalent), service agency or the gas supplier.

AIR FLOW

UPFLOW

CAUTION

As with any mechanical equipment, personal injury

can result from contact with sharp sheet metal

edges. Be careful when you handle this equipment.

HORIZONTAL RIGHT

HORIZONTAL LEFT

Table of Contents

Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

EL296UHE Gas Furnace . . . . . . . . . . . . . . . . . . . . . . . . . 3

Shipping and Packing List . . . . . . . . . . . . . . . . . . . . . . . . 3

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Use of Furnace as a Construction Heater . . . . . . . . . . . 4

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Combustion, Dilution, Ventilation Air . . . . . . . . . . . . . . . 5

Setting Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Duct System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Pipe and Fittings Specifications . . . . . . . . . . . . . . . . . . . 13

Joint Cementing Procedure . . . . . . . . . . . . . . . . . . . . . . . 15

Venting Practices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Integrated Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Unit Start Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Gas Pressure Measurement . . . . . . . . . . . . . . . . . . . . . . 50

Proper Combustion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

High Altitude . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

Other Unit Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Repair Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Start-Up and Performance Checklist . . . . . . . . . . . . . . . 56

02/13

507067-01

*2P0213*

Page 1

*P507067-01*

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EL296UHE Gas Furnace

Shipping and Packing List

Package 1 of 1 contains

The EL296UHE Category IV gas furnace is shipped ready

for installation in the upflow or horizontal position. The fur-

nace is shipped with the bottom panel in place. The bot-

tom panel must be removed if the unit is to be installed in

horizontal or upflow applications with bottom return air.

1 - Assembled EL296UHE unit

1 - Bag assembly containing the following:

1 -Snap bushing

1 -Snap plug

The EL296UHE can be installed as either a Direct Vent

or a Non-Direct Vent gas central furnace.

1 - Wire tie

1 -Condensate trap

The furnace is equipped for installation in natural gas ap-

plications. A conversion kit (ordered separately) is re-

quired for use in propane/LP gas applications.

1 -Condensate trap cap

1 -Condensate trap clamp

1 -2” diameter debris screen

1 -3/4” Threaded street elbow

Check equipment for shipping damage. If you find any

damage, immediately contact the last carrier.

NOTE - In Direct Vent installations, combustion air is taken

from outdoors and flue gases are discharged outdoors. In

Non-Direct Vent installations, combustion air is taken from

indoors or ventilated attic or crawlspace and flue gases are

discharged outdoors. See figures 1 and 2 for applications in-

volving roof termination.

The following items may also be ordered separately:

1 - Thermostat

1 - LP/Propane changeover kit

1 - Return air base kit

DIRECT VENT INSTALLATION

NON-DIRECT VENT

INSTALLATION

EXHAUST OUTLET

COMBUSTION

EXHAUST

OUTLET

1 - Horizontal suspension kit

1 - High altitude pressure switch

AIR INTAKE OUTSIDE

OF HOUSE

Safety Information

CAUTION

As with any mechanical equipment, personal injury

can result from contact with sharp sheet metal

edges. Be careful when you handle this equipment.

COMBUSTION

AIR INTAKE

INSIDE

OF HOUSE

DANGER

Danger of explosion.

There are circumstances in which odorant used with

LP/propane gas can lose its scent. In case of a leak,

LP/propane gas will settle close to the floor and may

be difficult to smell. An LP/propane leak detector

should be installed in all LP applications.

FIGURE 1

NON-DIRECT VENT

INSTALLATION

NON-DIRECT VENT

INSTALLATION

EXHAUST

OUTLET

EXHAUST

OUTLET

Use only the type of gas approved for use with this furnace.

Refer to unit nameplate.

EL296UHE units are CSA International certified to ANSI

Z21.47 and CSA 2.3 standards.

Building Codes

In the USA, installation of gas furnaces must conform with lo-

cal 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:

COMBUSTION

AIR INTAKE INSIDE

VENTILATED

COMBUSTION

AIR INTAKE INSIDE

VENTILATED

CRAWL SPACE

ATTIC SPACE

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.

FIGURE 2

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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.

Heating Unit Installed Parallel to Air Handler Unit

Dampers

(open during heating operation only)

Installation Locations

Gas Unit

This furnace is CSA International certified for installation

clearances to combustible material as listed on the unit

nameplate and in the table in figure 12. Accessibility and ser-

vice clearances must take precedence over fire protection

clearances.

AIR FLOW

Air Handler Unit

Dampers

(open during cooling operation only)

NOTE - For installation on combustible floors, the furnace

shall not be installed directly on carpeting, tile, or other

combustible material other than wood flooring.

Heating Unit Installed Upstream of Cooling Coil

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 apublic garage, hangar, or other building that has a haz-

ardous atmosphere, the furnace must be installed accord-

ing to recommended good practice requirements and cur-

rent National Fuel Gas Code or CSA B149 standards.

AIR FLOW

Gas Unit

Cooling Coil

FIGURE 3

NOTE - This furnace is designed for a minimum continu-

ous return air temperature of 60°F (16°C) or an intermit-

tent operation down to 55°F (13°C) dry bulb for cases

where a night setback thermostat is used. Return air tem-

perature must not exceed 85°F (29°C) dry bulb.

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.

The EL296UHE furnace may be installed in alcoves, clos-

ets, attics, basements, garages, crawl spaces and utility

rooms in the upflow or horizontal position.

This EL296UHE furnace must be installed so that its

electrical components are protected from water.

This furnace design has not been CSA certified for installa-

tion in mobile homes, recreational vehicles, or outdoors.

Installed in Combination with a Cooling Coil

Use of Furnace as Construction Heater

When this furnace is used with cooling coils (figure 3), it shall

be installed in parallel with, or on the upstream side of, cool-

ing coils 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 oper-

ated, 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.

Lennox does not recommend the use of EL296UHE units

as a construction heater during any phase of construction.

Very low return air temperatures, harmful vapors and op-

eration of the unit with clogged or misplaced filters will dam-

age the unit.

EL296UHE units may be used for heating of buildings or

structures under construction, if the following conditions

are met:

When installed, this furnace must be electrically grounded

according to local codes. In addition, in the United States,

installation must conform with the current National Electric

Code, ANSI/NFPA No. 70. The National Electric Code

(ANSI/NFPA No. 70) is available from the following ad-

dress:

D The vent system must be permanently installed per

these installation instructions.

D A room thermostat must control the furnace. The use of

fixed jumpers that will provide continuous heating is not

allowed.

D The return air duct must be provided and sealed to the

furnace.

National Fire Protection Association

1 Battery March Park

Quincy, MA 02269

D Return air temperature range between 60°F (16°C) and

80°F (27°C) must be maintained.

D Air filters must be installed in the system and must be

maintained during construction.

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.

D Air filters must be replaced upon construction comple-

tion.

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D The input rate and temperature rise must be set per the

furnace rating plate.

WARNING

D One hundred percent (100%) outdoor air must be pro-

vided for combustion air requirements during construc-

tion. Temporary ducting may supply outdoor air to the

furnace. Do not connect duct directly to the furnace.

Size the temporary duct following these instructions in

section for Combustion, Dilution and Ventilation Air in a

confined space with air from outside.

The State of California has determined that this prod-

uct may contain or produce a chemical or chemicals,

in very low doses, which may cause serious illness

or death. It may also cause cancer, birth defects or

reproductive harm.

WARNING

D The furnace heat exchanger, components, duct system,

air filters and evaporator coils must be thoroughly

cleaned following final construction clean-up.

Insufficient combustion air can cause headaches,

nausea, dizziness or asphyxiation. It will also cause

excess water in the heat exchanger resulting in rust-

ing 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 com-

bustion air supply:

D All furnace operating conditions (including ignition, in-

put rate, temperature rise and venting) must be verified

according to these installation instructions.

General

Permanent wave solutions

Chlorinated waxes and cleaners

These instructions are intended as a general guide and do

not supersede local codes in any way. Consult authorities

having jurisdiction before installation.

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

In addition to the requirements outlined previously, the fol-

lowing general recommendations must be considered

when installing an EL296UHE furnace:

• Place the furnace as close to the center of the air dis-

tribution system as possible. The furnace should also be

located close to the vent termination point.

• When the furnace is installed in non-direct vent applica-

tions, do not install the furnace where drafts might blow

directly into it. This could cause improper combustion

and unsafe operation.

Combustion, Dilution & Ventilation Air

If the EL296UHE is installed as a Non-Direct Vent Fur-

nace, follow the guidelines in this section.

• When the furnace is installed in non-direct vent applica-

tions, do not block the furnace combustion air opening

with clothing, boxes, doors, etc. Air is needed for proper

combustion and safe unit operation.

NOTE - In Non-Direct Vent installations, combustion air

is taken from indoors or ventilated attic or crawlspace

and flue gases are discharged out-doors.

• When the furnace is installed in an attic or other insu-

lated space, keep insulation away from the furnace.

In the past, there was no problem in bringing in sufficient

outdoor air for combustion. Infiltration provided all the air

that was needed. In today's homes, tight construction

practices make it necessary to bring in air from outside

for combustion. Take into account that exhaust fans, ap-

pliance vents, chimneys, and fireplaces force additional

air 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 po-

tentially dangerous situation.

• When the furnace is installed in an unconditioned

space, consider provisions required to prevent freezing

of condensate drain system.

• The “A” coil drain pan is high quality engineering poly-

mer with a maximum service temperature of 500° F.

However, adequate space must be provided between

the drain pan and the furnace heat exchanger. At least

2” space is required for sectionalized heat exchanger

and and 4” for drum-type or oil-fired furnace exchanger.

Closer spacing may damage the drain pan and cause

leaking.

In the absence of local codes concerning air for combus-

tion and ventilation, use the guidelines and procedures in

this section to install EL296UHE furnaces to ensure effi-

cient and safe operation. You must consider combustion

air needs and requirements for exhaust vents and gas

CAUTION

EL296UHE unit should not be installed in areas nor-

mally subject to freezing temperatures.

Page 5

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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-

plete and official position of the ANSI on the referenced

subject, which is represented only by the standard in its

entirety.

Confined Space

A confined space is an area with a volume less than 50 cubic

feet (1.42 m ) per 1,000 Btu (.29 kW) per hour of the com-

bined input rating of all appliances installed in that space. This

definition includes furnace closets or small equipment rooms.

When the furnace is installed so that supply ducts carry air

circulated by the furnace to areas outside the space con-

taining the furnace, the return airmust be handled by ducts

which are sealed to the furnace casing and which terminate

outside the space containing the furnace. This is especially

important when the furnace is mounted on a platform in a

confined space such as a closet or small equipment room.

Even a small leak around the base of the unit at the platform

or at the return air duct connection can cause a potentially

dangerous negative pressure condition. Air for combustion

and ventilation can be brought into the confined space ei-

ther from inside the building or from outside.

In Canada, refer to the CSA B149 installation codes.

CAUTION

Do not install the furnace in a corrosive or contami-

nated atmosphere. Meet all combustion and ventila-

tion air requirements, as well as all local codes.

All gas‐fired appliances require air for the combustion pro-

cess. If sufficient combustion air is not available, the fur-

nace or other appliance will operate inefficiently and un-

safely. Enough air must be provided to meet the needs of all

fuel-burning appliances and appliances such as exhaust

fans which force air out of the house. When fireplaces, ex-

haust fans, or clothes dryers are used at the same time as

the furnace, much more air is required to ensure proper

combustion and to prevent a downdraft. Insufficient air

causes incomplete combustion which can result in carbon

monoxide.

Air from Inside

If the confined space that houses the furnace adjoins a

space categorized as unconfined, air can be brought in by

providing two permanent openings between the two

spaces. Each opening must have a minimum free area of 1

square inch (645 mm ) per 1,000 Btu (.29 kW) per hour of

total input rating of all gas-fired equipment in the confined

space. Each opening must be at least 100 square inches

In addition to providing combustion air, fresh outdoor air di-

lutes contaminants in the indoor air. These contaminants

may include bleaches, adhesives, detergents, solvents

and other contaminants which can corrode furnace compo-

nents.

(64516 mm ). 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

The requirements for providing air for combustion and ven-

tilation depend largely on whether the furnace is installed in

an unconfined or a confined space.

ROOF TERMINATED

EXHAUST PIPE

Unconfined Space

An unconfined space is an area such as a basement or

large equipment room with a volume greater than 50 cubic

feet (1.42 m ) per 1,000 Btu (.29 kW) per hour of the com-

OPENINGS

(To Adjacent

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 un-

confined, it might be necessary to bring in outdoor air for

combustion if the structure does not provide enough air by

infiltration. If the furnace is located in a building of tight

construction with weather stripping and caulking around

the windows and doors, follow the procedures in the Air

from Outside section.

SIDE WALL

EL296UH

Unconfined

Space)

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

NOTE - Each opening shall have a free area of at least one square inch

per 1,000 Btu (645mm per .29kW) per hour of the total input rating of

all equipment in the enclosure, but not less than 100 square inches

2).

(64516mm.

FIGURE 4

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Air from Outside

EQUIPMENT IN CONFINED SPACE

(Inlet Air from Ventilated Crawlspace and Outlet Air to Outside)

If air from outside is brought in for combustion and ventila-

tion, the confined space shall be provided with two perma-

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 mini-

Roof Terminated

Exhaust Pipe

mum free area of 1 square inch per 4,000 Btu (645mm

per 1.17kW) per hour of total input rating of all equipment

in the enclosure (figures 5 and 8). When communicating

with the outdoors through horizontal ducts, each opening

shall have a minimum free area of 1 square inch per 2,000

Inlet Air

(Minimum

12 in.(305mm)

Above crawl

space floor)

Ventilation

Louvers

(Crawl space)

Furnace

Btu (645mm per .59kW) per total input rating of all equip-

ment in the enclosure (See figure 9). It is also permissible

to bring in air for combustion from a ventilated attic (figure

6) or ventilated crawl space (figure 7).

Coupling or

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE

(Inlet Air from Crawl Space and Outlet Air to Outside)

*Intake Debris Screen Provided)

3 in. to 2 in.

Transition

(Field Provided)

VENTILATION LOUVERS

(Each end of attic)

* See table 6 for maximum vent lengths

ROOF TERMINATED

EXHAUST PIPE

NOTE-The inlet and outlet air openings shall each have a free area

of at least one square inch per 4,000 Btu (645mm per 1.17kW) per

hour of the total input rating of all equipment in the enclosure.

FIGURE 7

OUTLET

AIR

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

area, the blocking effect of louvers, grilles, or screens

must be considered. If the design and free area of protec-

tive covering is not known for calculating the size opening

required, it may be assumed that wood louvers will have

20 to 25 percent free area and metal louvers and grilles

will have 60 to 75 percent free area. Louvers and grilles

must be fixed in the open position or interlocked with the

equipment so that they are opened automatically during

equipment operation.

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

FURNACE

VENTILATION

LOUVERS

(For unheated

crawl space)

INLET

AIR

NOTE-The inlet and outlet air openings shall each have a free area

of at least one square inch per 4,000 Btu (645mm per 1.17kW) per

hour of the total input rating of all equipment in the enclosure.

FIGURE 5

EQUIPMENT IN CONFINED SPACE

(Inlet Air from Ventilated Attic and Outlet Air to Outside)

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE

(All Air Through Ventilated Attic)

Ventilation Louvers

Inlet Air

Roof Terminated

Exhaust Pipe

ROOF TERMINATED

EXHAUST PIPE

(Minimum

VENTILATION LOUVERS

(Each end of attic)

12 in.(305mm) Above

attic floor)

OUTLET

AIR

*Intake Debris

Screen

(Provided)

INLET AIR

(Ends 12” above

bottom)

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

FURNACE

Furnace

* See table 6 for maximum vent lengths

NOTE-The inlet and outlet air openings shall each have a free area

of at least one square inch per 4,000 Btu (645mm per 1.17kW) per

hour of the total input rating of all equipment in the enclosure.

NOTE-The inlet and outlet air openings shall each have a free area of

at least one square inch per 4,000 Btu (645mm per 1.17kW) per hour

of the total input rating of all equipment in the enclosure.

FIGURE 8

FIGURE 6

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EQUIPMENT IN CONFINED SPACE -

ALL AIR FROM OUTSIDE

Installation - Setting Equipment

WARNING

ROOF TERMINATED

EXHAUST PIPE

Do not connect the return air duct 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.

OUTLET AIR

FURNACE

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

WARNING

INLET AIR

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.

NOTE-Each air duct opening shall have a free area of at least one

square inch per 2,000 Btu (645mm per .59kW) per hour of the total

input rating of all equipment in the enclosure. If the equipment room

is located against an outside wall and the air openings communi-

cate directly with the outdoors, each opening shall have a free area

of at least 1 square inch per 4,000 Btu (645mm per 1.17kW) per

hour of the total input rating of all other equipment in the enclosure.

Upflow Applications

The EL296UHE gas furnace can be installed as shipped

in the upflow position. Refer to figure 12 for clearances.

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.

FIGURE 9

Shipping Bolt Removal

Units with 1/2 hp blower motor are equipped with three flex-

ible 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 10. The bolt and washer must be re-

moved before the furnace is placed into operation. Af-

ter the bolt and washer have been removed, the rigid leg

will not touch the blower housing.

Allow for clearances to combustible materials as indicated

on the unit nameplate.

EL296 Furnaces with

1/2 HP Blower Motor

RIGID LEG

(Remove shipping bolt

and washer)

FIGURE 10

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SETTING EQUIPMENT

UPFLOW APPLICATION

UNIT

FRONT

UNIT

FRONT

AIR FLOW

1/2”

max.

FRONT VIEW

SIDE VIEW

HORIZONTAL APPLICATION

UNIT

FRONT

AIR FLOW

1/2”

max.

END VIEW

FRONT VIEW

Unit must be level side-to-side. Unit may be positioned from level to 1/2” toward the front to aid in draining.

FIGURE 11

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Return Air Guidelines

WARNING

Return air can be brought in through the bottom or either

side of the furnace installed in an upflow application. If the

furnace is installed on a platform with bottom return, make

an airtight seal between the bottom of the furnace and the

platform to ensure that the furnace operates properly and

safely. The furnace is equipped with a removable bottom

panel to facilitate installation.

Improper installation of the furnace can result in per-

sonal 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 fur-

nace should be sealed airtight to the return air ple-

num. 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. Al-

low absolutely no sagging, cracks, gaps, etc.

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.

For no reason should return and supply air duct sys-

tems ever be connected to or from other heating de-

vices such as a fireplace or stove, etc. Fire, explo-

sion, carbon monoxide poisoning, personal injury

and/or property damage could result.

Refer to Product Specifications for additional information.

EL296UHE 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.) re-

quire either a return air base or field-fabricated transi-

tion to accommodate an optional IAQ accessory taller

than 14.5”. See figure 13.

Installation Clearances

Top

Side Return Air

(with transition and filter)

Left Side

Right Side

20” X 25” X 1”

(508mmX635mmX25mm)

Bottom (Floor)

1−1/2”

Air Filter

Top/Plenum

*Front

Back

1 in. (25 mm)

Sides

0†

Return

Air

Vent

Plenum

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.

Transition

FIGURE 13

FIGURE 12

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Optional Return Air Base

(Upflow Applications Only)

FURNACE

FRONT

¹23 (584)

Overall

IF BASE

IS USED

3−1/4

(83)

¹Minimum

11 (279)

Maximum

WITHOUT

IAQ CABINET,

A SINGLE

RETURN AIR

PLENUM

(Maximum)

INDOOR AIR

QUALITY

CABINET

(PCO, Filter

Cabinet, etc.)

¹22−7/16

(570)

Overall

¹Unit side return air

Opening

14 (356)

MUST

AIR FLOW

(Maximum)

COVER BOTH

UNIT AND

RETURN

AIR BASE

OPENINGS

SIDE RETURN

AIR OPENINGS

(Either Side)

5−5/8

(143)

7−1/4

(184)

(584)

OPTIONAL

RETURN

AIR BASE

3/4

(19)

17−1/2 (446) B Width (50W98)

21 (533) C Width (50W99)

26−7/8

(683)

24−1/2 (622) D Width (51W00)

SIDE VIEW

FRONT VIEW

NOTE- Optional side return air filter kits are not for use with return air base.

Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.

Minimum unit side return air opening dimensions for units requiring 1800 cfm of air and over (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.

To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.

FIGURE 14

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.

Screw

Bottom Cap

Bottom Panel

Front

Back

FIGURE 15

FIGURE 16

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The EL296UHE furnace can be installed in horizontal ap-

plications with either right- or left-hand air discharge.

Refer to figure 17 for clearances in horizontal applications.

HORIZONTAL SUSPENSION KIT

Internal Brace

(provided with kit)

Metal Strap

(typical)

Horizontal Application

Installation Clearances

Right-Hand Discharge

Bracket

(typical)

Left End

Right End

Air

Flow

Air

Flow

Air

Flow

Bottom (Floor)**

Left-Hand Discharge

Top

FIGURE 18

Left End

Right End

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.

Air

Flow

Air

Flow

Bottom (Floor)**

Platform Installation of Horizontal Unit

Top

1 - Select location for unit keeping in mind service and

other necessary clearances. See figure 17.

Front*

Back

Ends

Vent

2 - Construct a raised wooden frame and cover frame

with a plywood sheet. If unit is installed above finished

space, install an an auxiliary drain pan under unit. Set

unit in drain pan as shown in figure 19. Leave 8 inches

for service clearance below unit for condensate trap.

Floor

0‡

3 - Provide a service platform in front of unit. When instal-

ling the unit in a crawl space, a proper support platform

may be created using concrete blocks.

*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.

4 - Route auxiliary drain line so that water draining from

this outlet will be easily noticed by the homeowner.

5 - If necessary, run the condensate line into a conden-

sate pump to meet drain line slope requirements. The

pump must be rated for use with condensing furnaces.

Protect the condensate discharge line from the pump

to the outside to avoid freezing.

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

floor joists, as shown in figure 18, or install the furnace on

a platform, as shown in figure 19. A horizontal suspension

kit (51W10) may be ordered from Lennox or use equiva-

lent.

6 - Continue with exhaust, condensate and intake piping

installation according to instructions.

NOTE - Heavy-gauge sheet metal straps may be used to

suspend the unit from roof rafters or ceiling joists. When

straps are used to suspend the unit in this way, support

must be provided for both the ends. The straps must not

interfere with the plenum or exhaust piping installation.

Cooling coils and supply and return air plenums must

be supported separately.

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Duct System

*GAS CONNECTION

INTAKE PIPE

Use industry‐approved standards to size and install the

supply and return air duct system. Refer to ACCA Manual

D. This will result in a quiet and low‐static system that has

uniform air distribution.

EXHAUST PIPE

*Gas connector may be

used for Canadian

installation if accept-

able by local authority

having jurisdiction.

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 furnace 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

of the heat exchanger. The furnace access panel must al-

ways be in place when the furnace is operating and it must

not allow leaks.

RAISED

PLATFORM

SERVICE PLATFORM

FIGURE 19

Return Air -- Horizontal Applications

Return air may be brought in only through the end of a fur-

nace installed in the horizontal position. The furnace is

equipped with a removable bottom panel to facilitate

installation. See figure 15.

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 fireplace) is installed.

Filters

When return air is drawn from a room, a negative pres-

sure is created in the room. If agas 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 com-

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.

This unit is not equipped with a filter or rack. A field-pro-

vided high velocity rated filter is required for the unit to oper-

ate properly. Table 1 lists recommended filter sizes.

A filter must be in place whenever the unit is operating.

IMPORTANT

If a high-efficiency filter is being installed as part of

this system to ensure better indoor air quality, the fil-

ter must be properly sized. High-efficiency filters

have a higher static pressure drop than standard-ef-

ficiency glass/foam filters. If the pressure drop is too

great, system capacity and performance may be re-

duced. The pressure drop may also cause the limit to

trip more frequently during the winter and the indoor

coil to freeze in the summer, resulting in an increase

in the number of service calls.

Return air can be brought in through the bottom or either

side of the furnace (return air brought into either side of fur-

nace allowed only in upflow applications). If a furnace with

bottom return air is installed on a platform, make an airtight

seal between the bottom of the furnace and the platform to

ensure that the unit operates properly and safely. Use fiber-

glass 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.

Before using any filter with this system, check the

specifications provided by the filter manufacturer

against the data given in the appropriate Lennox

Product Specifications bulletin. Additional informa-

tion is provided in Service and Application Note

ACC-00-2 (August 2000).

Pipe & Fittings Specifications

All pipe, fittings, primer and solvent cement must conform

with American National Standard Institute and the Ameri-

can Society for Testing and Materials (ANSI/ASTM) stan-

dards. The solvent shall be free flowing and contain no

lumps, undissolved particles or any foreign matter that ad-

versely affects the joint strength or chemical resistance of

the cement. The cement shall show no gelation, stratifica-

tion, or separation that cannot be removed by stirring. Re-

fer to the table 2 below for approved piping and fitting ma-

terials.

TABLE 1

Filter Size

Furnace

Cabinet Width

Side Return

Bottom Return

16 X 25 X 1 (1)

20 X 25 X 1 (1)

24 X 25 X 1 (1)

17-1/2”

21”

16 X 25 X 1 (1)

16 X 25 X 1 (2)

24-1/2”

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Low temperature solvent cement is recommended during

installation in 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 inside socket surface of fitting and male end of pipe to

depth of fitting socket.

CAUTION

Solvent cements for plastic pipe are flammable liq-

uids 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 ce-

ment with skin and eyes.

Canadian Applications Only - Pipe, fittings, primer

and solvent cement used to vent (exhaust) this ap-

pliance must be certified to ULC S636 and supplied by a

single manufacturer as part of an approved vent (ex-

haust) system. In addition, the first three feet of vent

pipe from the furnace flue collar must be accessible for

inspection.

TABLE 2

PIPING AND FITTINGS SPECIFICATIONS

Schedule 40 PVC (Pipe)

D1785

F891

Schedule 40 PVC (Cellular Core Pipe)

Schedule 40 PVC (Fittings)

D2466

F441

Joint Cementing Procedure

Schedule 40 CPVC (Pipe)

All cementing of joints should be done according to the

specifications outlined in ASTM D 2855.

Schedule 40 CPVC (Fittings)

SDR-21 PVC or SDR-26 PVC (Pipe)

SDR-21 CPVC or SDR-26 CPVC (Pipe)

Schedule 40 ABS Cellular Core DWV (Pipe)

Schedule 40 ABS (Pipe)

F438

D2241

F442

F628

DANGER

DANGER OF EXPLOSION!

D1527

D2468

Schedule 40 ABS (Fittings)

Fumes from PVC glue may ignite during system

check. Allow fumes to dissipate for at least 5 minutes

before placing unit into operation.

ABS-DWV (Drain Waste & Vent)

(Pipe & Fittings)

D2661

D2665

PVC-DWV (Drain Waste & Vent)

Pipe & Fittings)

1 - Measure and cut vent pipe to desired length.

ASTM

SPECIFICATION

PRIMER & SOLVENT CEMENT

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.

PVC & CPVC Primer

PVC Solvent Cement

CPVC Solvent Cement

ABS Solvent Cement

F656

D2564

F493

NOTE - Check the inside of vent pipe thoroughly for

D2235

any obstruction that may alter furnace operation.

PVC/CPVC/ABS All Purpose Cement For

Fittings & Pipe of the same material

D2564, D2235, F493

D3138

3 - Clean and dry surfaces to be joined.

ABS to PVC or CPVC Transition Solvent

Cement

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.

CANADA PIPE & FITTING & SOLVENT

CEMENT

MARKING

PVC & CPVC Pipe and Fittings

PVC & CPVC Solvent Cement

ULCS636

NOTE- Time is critical at this stage. Do not allow prim-

er to dry before applying cement.

ABS to PVC or CPVC Transition Cement

6 - Promptly apply solvent cement to end of pipe and in-

side socket surface of fitting. Cement should be ap-

plied lightly but uniformly to inside of socket. Take

care to keep excess cement out of socket. Apply sec-

ond coat to end of pipe.

IMPORTANT

EL296UHE 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 con-

nections to the PVC fittings in the unit.

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 dur-

ing assembly (but not after pipe is fully inserted) to dis-

tribute cement evenly. DO NOT turn ABS or cellular

core pipe.

Use PVC primer and solvent cement or ABS solvent cement

meeting ASTM specifications, refer to Table 2. As an alter-

nate, use all purpose cement, to bond ABS, PVC, or CPVC

pipe when using fittings and pipe made of the same materi-

als. Use transition solvent cement when bonding ABS to ei-

ther PVC or CPVC.

NOTE - Assembly should be completed within 20 sec-

onds after last application of cement. Hammer blows

should not be used when inserting pipe.

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8 - After assembly, wipe excess cement from pipe at end

of fitting socket. A properly made joint will show a

bead around its entire perimeter. Any gaps may indi-

cate an improper assembly due to insufficient sol-

vent.

Conduct the following test while each appliance is operat-

ing and the other appliances (which are not operating) re-

main connected to the common venting system. If the

venting system has been installed improperly, you must

correct the system as indicated in the general venting re-

quirements section.

9 - Handle joints carefully until completely set.

Venting Practices

WARNING

CARBON MONOXIDE POISONING HAZARD

Failure to follow the steps outlined below for each

appliance connected to the venting system being

placed into operation could result in carbon mon-

oxide poisoning or death.

The following steps shall be followed for each ap-

pliance connected to the venting system being

placed into operation, while all other appliances

connected to the venting system are not in

operation:

Piping Suspension Guidelines

SCHEDULE 40

PVC - 5'

all other pipe* - 3'

* See table 2 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.

1 - Seal any unused openings in the common venting sys-

tem.

NOTE - All horizontal runs of exhaust pipe must slope back to-

ward unit a minimum of 1/4” (6mm) drop for each 12” (305mm).

2 - Inspect the venting system for proper size and horizontal

pitch. Determine that there is no blockage, restriction,

leakage, corrosion, or other deficiencies which could

cause an unsafe condition.

Wall Thickness Guidelines

24” maximum

3/4” minimum

3 - Close all building doors and windows and all doors be-

tween the space in which the appliances remaining

connected to the common venting system are located

and other spaces of the building. Turn on clothes dry-

ers and any appliances not connected to the common

venting system. Turn on any exhaust fans, such as

range hoods and bathroom exhausts, so they will oper-

ate at maximum speed. Do not operate a summer ex-

haust fan. Close fireplace dampers.

Wall

inside

outside

insulation

(if required)

4 - Follow the lighting instructions. Turn on the appliance

that is being inspected. Adjust the thermostat so that

the appliance operates continuously.

FIGURE 20

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.

5 - After the main burner has operated for 5 minutes, test

for leaks of flue gases at the draft hood relief opening.

Use the flame of a match or candle.

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 conden-

sate collection trap and lines.

6 - After determining that each appliance connected to the

common venting system is venting properly, (step 3)

return all doors, widows, exhaust fans, fireplace damp-

ers, and any other gas-burning appliances to their pre-

vious mode of operation.

Removal of the Furnace from Common Vent

In the event that an existing furnace is removed from a

venting system commonly run with separate gas ap-

pliances, the venting system is likely to be too large to

properly vent the remaining attached appliances.

7 - If a venting problem is found during any of the preced-

ing tests, the common venting system must be modi-

fied to correct the problem.

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Resize the common venting system to the minimum

vent pipe size determined by using the appropriate

tables in Appendix G. (These are in the current stan-

dards of the National Fuel Gas Code ANSI Z223.1.

NOTE - In Non‐Direct Vent installations, combustion air is

taken from indoors or ventilated attic or crawlspace 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 3 and 5. Count all elbows inside and outside the

home. Table 3 lists the minimum vent pipe lengths per-

mitted. Table 5 lists the maximum pipe lengths permitted.

REPLACING FURNACE THAT

WAS PART OF A COMMON

VENT SYSTEM

CHIMNEY

OR GAS

VENT

(Check sizing

for water

heater only)

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. Refer to table 8.

FURNACE

(Replaced

by EL296)

WATER

HEATER

In some applications which permit the use of several differ-

ent sizes of vent pipe, a combination vent pipe may be

used. Contact Lennox' Application Department for assis-

tance in sizing vent pipe in these applications.

OPENINGS

(To Adjacent

Room)

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.

If an EL296UHE furnace replaces a furnace which

was commonly vented with another gas appliance,

the size of the existing vent pipe for that gas ap-

pliance 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.

FIGURE 21

Horizontal Installation Offset Requirements

Exhaust Piping (Figures 22, 24 and 25)

Exhaust Pipe

Route piping to outside of structure. Continue with installa-

tion following instructions given in piping termination sec-

tion.

12” Min.

12” Max.

Horizontal

Gas Furnace

CAUTION

Do not discharge exhaust into an existing stack or

stack that also serves another gas appliance. If verti-

cal discharge through an existing unused stack is re-

quired, insert PVC pipe inside the stack until the end

is even with the top or outlet end of the metal stack.

NOTE - All horizontal runs of exhaust pipe must slope back to-

ward unit. A minimum of 1/4” (6mm) drop for each 12” (305mm)

of horizontal run is mandatory for drainage.

NOTE - Exhaust pipe MUST be glued to furnace exhaust fittings.

NOTE - Exhaust piping should be checked carefully to make

sure there are no sags or low spots.

CAUTION

FIGURE 22

The exhaust vent pipe operates under positive pres-

sure and must be completely sealed to prevent leak-

age of combustion products into the living space.

TABLE 3

MINIMUM VENT PIPE LENGTHS

EL296UHE

MODEL

MIN. VENT LENGTH*

Vent Piping Guidelines

15 ft. or

5 ft. plus 2 elbows or

10 ft. plus 1 elbow

045, 070, 090, 110, 135

The EL296UHE can be installed as either a Non-Direct

Vent or a Direct Vent gas central furnace.

*Any approved termination may be added to the minimum length listed.

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Use the following steps to correctly size vent pipe diameter.

IMPORTANT

Do not use screens or perforated metal in exhaust or

intake terminations. Doing so will cause freeze-ups

and may block the terminations.

Piping Size Process

What is the

furnace capacity?

045, 070, 090,

110 or 135?

Which style termination

being used?

Standard or concentric?

See table 4.

Which needs

most elbows?

Intake or

exhaust?

How many elbows?

Count all elbows inside

and outside house.

Desired pipe size?

2”, 2-1/2”, 3”

What is the altitude of

the furnace installation?

Use table 5 or 6 to find

max intake or exhaust pipe

length. Includes all vent

pipe and elbows inside

and outside the house.

FIGURE 23

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TABLE 4

OUTDOOR TERMINATION USAGE

STANDARD

CONCENTRIC

Wall Kit

Wall Ring Kit

2 inch

FlushMount

Kit

1-1/2 inch

2 inch

3 inch

Vent

Pipe

Dia. in.

2 inch

3 inch

Input Size

Field

Fabricated

71M80

(US)

44W92

(CA)

69M29

(US)

44W92

(CA)

51W11 (US)

51W12 (CA)

22G44 (US)

30G28 (CA)

44J40 (US)

60L46 (US)

44W93 (CA)

15F74

81J20 (CA)

YES

2-1/2

YES

045

070

090

YES

2-1/2

YES

2-1/2

YES

2-1/2

YES

110

135

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.

Requires field-provided outdoor 1-1/2” exhaust accelerator.

Concentric kits 71M80 and 44W92 include 1-1/2” outdoor accelerator, when used with 045 and 070 input models.

Flush mount kit 51W11 and 51W12 includes 1-1/2 in. outdoor exhaust accelerator, required when used with 045, 070 and 090 input models.

Termination kits 30G28, 44W92, 44W93 and 81J20 are certified to ULC S636 for use in Canada only.

See table 8 for vent accelerator requirements.

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TABLE 5

Maximum Allowable Intake or Exhaust Vent Length in Feet

NOTE - 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.

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

2” Pipe

Model

090

2-1/2” Pipe

3” Pipe

Model

090

118

113

108

103

Number Of

90° Elbows

Used

Model

090

045

070

110

135

045

115

110

105

100

070

115

110

105

100

110

135

045

138

133

128

123

118

113

108

103

070

137

132

127

122

117

112

107

102

110

118

113

108

103

135

114

109

104

n/a

Standard Termination Elevation 4500 - 10,000 ft

2” Pipe

Model

090

2-1/2” Pipe

3” Pipe

Model

090

118

113

108

103

Number Of

90° Elbows

Used

Model

045

070

110

135

045

115

110

105

100

070

115

110

105

100

090

110

135

045

138

133

128

123

118

113

108

103

070

137

132

127

122

117

112

107

102

110

118

113

108

103

135

114

109

104

n/a

See concentric terminations next page.

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TABLE 5 Continued

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 - 4500 ft

2” Pipe

Model

090

2-1/2” Pipe

3” Pipe

Model

090

114

109

104

Number Of

90° Elbows

Used

Model

090

045

070

110

135

045

105

100

070

105

100

110

n/a

135

045

121

116

111

106

101

070

121

116

111

106

101

110

114

109

104

135

105

100

n/a

Concentric Termination Elevation 4501 - 10,000 ft

2” Pipe

2-1/2” Pipe

3” Pipe

Model

090

114

109

104

Number Of

90° Elbows

Used

Model

090

Model

090

045

070

110

135

045

105

100

070

105

100

110

n/a

135

045

121

116

111

106

101

070

121

116

111

106

101

110

114

109

104

135

105

100

n/a

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TABLE 6

Maximum Allowable Exhaust Vent Lengths With Furnace Installed in a Closet or Basement Using Ventilated

Attic or Crawl Space For Intake Air in Feet

NOTE - 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.

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

2” Pipe

Model

090

2-1/2” Pipe

3” Pipe

Model

090

Number Of

90° Elbows

Used

Model

090

045

070

110

135

045

100

070

100

110

135

045

118

113

108

103

070

117

112

107

102

110

135

n/a

Standard Termination Elevation 4500 - 10,000 ft

2” Pipe

Model

090

2-1/2” Pipe

3” Pipe

Model

090

Number Of

90° Elbows

Used

Model

045

070

110

135

045

100

070

100

090

110

135

045

118

113

108

103

070

117

112

107

102

110

135

n/a

Page 21

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TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR

NON-DIRECT VENT APPLICATIONS

EXHAUST INTAKE

EXHAUST

INTAKE

2”

3”

TRANSITION

2”

*2”

DO NOT transition

from smaller to larger

pipe in horizontal runs

of exhaust pipe.

* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.

FIGURE 24

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN HORIZONTAL DIRECT OR NON-DIRECT VENT

APPLICATIONS (RIGHT HAND DISCHARGE SHOWN)

45°

MAX

45°

MAX

12” max.

2”

EXHAUST

2”

*2”

2”

SIDE VIEW

2”

INTAKE

3”

DO NOT transition

from smaller to larger

pipe in horizontal runs

TRANSITION

3”

*2”

of exhaust pipe.

EXHAUST

*2”

INTAKE

* When transitioning up in pipe size, use the shortest length of 2” PVC pipe possible.

FIGURE 25

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Intake Piping

TYPICAL AIR INTAKE PIPE CONNECTIONS

HORIZONTAL NON−DIRECT VENT APPLICATIONS

(Horizontal Right−Hand Air Discharge Application Shown)

The EL296UHE furnace may be installed in either direct

vent or non-direct vent applications. In non-direct vent

applications, when intake air will be drawn into the furnace

from the surrounding space, the indoor air quality must be

considered and guidelines listed in Combustion, Dilution

and Ventilation Air section must be followed.

PVC pipe

coupling

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 transition solvent cement or a sheet metal screw

to secure the intake pipe to the inlet air connector.

INTAKE

DEBRIS

SCREEN

(Provided)

2 - Route piping to outside of structure. Continue with

installation following instructions given in general

guidelines for piping terminations and intake and ex-

haust piping terminations for direct vent sections. Re-

fer to table 5 for pipe sizes.

NOTE - Debris screen may be positioned straight out

(preferred) or with an elbow rotated to face down.

TYPICAL AIR INTAKE PIPE CONNECTIONS

UPFLOW NON−DIRECT

FIGURE 27

VENT APPLICATIONS

Follow the next two steps when installing the unit in Non‐

Direct Vent applications where combustion air is taken

from indoors or ventilated attic or crawlspace and flue

gases are discharged outdoors.

INTAKE

DEBRIS

SCREEN

(Provided)

1 - Use field-provided materials and the factory-provided

air intake screen to route the intake piping as shown in

figure 26 or 27. Maintain a minimum clearance of 3”

(76mm) around the air intake opening. The air intake

opening (with the protective screen) should always be

directed forward or to either side in the upflow position,

and either straight out or downward in the horizontal

position.

The air intake piping must not terminate too close

to the flooring or a platform. Ensure that the intake

air inlet will not be obstructed by loose insulation

or other items that may clog the debris screen.

2 - If intake air is drawn from a ventilated attic (figure 28)

or ventilated crawlspace (figure 29) the exhaust vent

length must not exceed those listed in table 6. If 3” di-

ameter pipe is used, reduce to 2” diameter pipe at the

termination point to accommodate the debris screen.

NOTE - Debris screen and elbow may be rotated, so that

screen may be positioned to face forward or to either side.

3 - Use a sheet metal screw to secure the intake pipe to

the connector, if desired.

FIGURE 26

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General Guidelines for Vent Terminations

CAUTION

In Non‐Direct Vent applications, combustion air is taken

from indoors or ventilated attic or crawlspace and the flue

gases are discharged to the outdoors. The EL296UHE is

then classified as a non‐direct vent, Category IV gas fur-

nace.

If this unit is being installed in an application with

combustion air coming in from a space serviced by

an exhaust fan, power exhaust fan, or other device

which may create a negative pressure in the space,

take care when sizing the inlet air opening. The in-

let air opening must be sized to accommodate the

maximum volume of exhausted air as well as the

maximum volume of combustion air required for

all gas appliances serviced by this space.

In Direct Vent applications, combustion air is taken from

outdoors and the flue gases are discharged to the out-

doors. The EL296UHE is then classified as a direct vent,

Category IV gas furnace.

In both Non‐Direct Vent and 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.

EQUIPMENT IN CONFINED SPACE

(Inlet Air from Ventilated Attic and Outlet Air to Outside)

Ventilation Louvers

Inlet Air

Roof Terminated

Exhaust Pipe

(Minimum

12 in.(305mm) Above

attic floor)

Position termination according to location given in figure 30

or 31. In addition, position termination so it is free from any

obstructions and 12” above the average snow accumula-

tion.

*Intake Debris

Screen

(Provided)

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 (1.8m) of a condensing unit because

the condensate can damage the painted coating.

Furnace

* See table 6 for maximum vent lengths

NOTE-The inlet and outlet air openings shall each have a free area

of at least one square inch per 4,000 Btu (645mm per 1.17kW) per

hour of the total input rating of all equipment in the enclosure.

NOTE - See table 7 for maximum allowed exhaust pipe

length without insulation in unconditioned space during

winter design temperatures below 32°F (0°C). If required

exhaust pipe should be insulated with 1/2” (13mm) Arma-

flex or equivalent. In extreme cold climate areas, 3/4”

(19mm) Armaflex or equivalent may be necessary. Insula-

tion on outside runs of exhaust pipe must be painted or

wrapped to protect insulation from deterioration. Exhaust

pipe insulation may not be necessary in some specific ap-

plications.

FIGURE 28

EQUIPMENT IN CONFINED SPACE

(Inlet Air from Ventilated Crawlspace and Outlet Air to Outside)

Roof Terminated

Exhaust Pipe

Inlet Air

(Minimum

IMPORTANT

Do not use screens or perforated metal in exhaust

terminations. Doing so will cause freeze-ups and

may block the terminations.

12 in.(305mm)

Above crawl

space floor)

Ventilation

Louvers

(Crawl space)

Furnace

Coupling or

*Intake Debris Screen Provided)

3 in. to 2 in.

Transition

IMPORTANT

For Canadian Installations Only:

(Field Provided)

* See table 6 for maximum vent lengths

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

(305mm).

NOTE-The inlet and outlet air openings shall each have a free area

of at least one square inch per 4,000 Btu (645mm per 1.17kW) per

hour of the total input rating of all equipment in the enclosure.

FIGURE 29

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TABLE 7

Maximum Allowable Exhaust Vent Pipe Length Without Insulation

In Unconditioned Space For Winter Design Temperatures

Unit Input Size

Vent Pipe

Diameter

Winter Design

Temperatures °F (°C)

045

070

090

110

135

N/A

2 in.

2-1/2 in.

3 in.

32 to 21

(0 to -6)

2 in

N/A

20 to 1

(-7 to -17)

2-1/2 in.

3 in.

2 in.

N/A

0 to -20

(-18 to -29)

2-1/2 in.

3 in.

Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.

NOTE - Maximum uninsulated vent lengths listed may include the termination(vent pipe exterior to the structure) and cannot exceed 5 linear feet or the

maximum allowable intake or exhaust vent length listed in table 5 or 6 which ever is less.

Page 25

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VENT TERMINATION CLEARANCES

FOR NON-DIRECT VENT INSTALLATIONS IN THE US AND CANADA

INSIDE CORNER

DETAIL

Fixed

Closed

Operable

Fixed

Closed

Operable

AREA WHERE TERMINAL

IS NOT PERMITTED

AIR SUPPLY INLET

VENT TERMINAL

US Installations

Canadian Installations

A =

Clearance above grade, veranda,

porch, deck or balcony

12 inches (305mm) or 12 in. (305mm)

above average snow accumulation.

12 inches (305mm) or 12 in. (305mm)

above average snow accumulation.

B =

Clearance to window or

door that may be opened

6 inches (152mm) for appliances <10,000

Btuh (3kw), 12 inches (305mm) for

appliances > 10,000 Btuh (3kw) and

<100,000 Btuh (30kw), 36 inches (.9m)

for appliances > 100,000 Btuh (30kw)

4 feet (1.2 m) below or to side of opening;

1 foot (30cm) above opening

C =

D =

Clearance to permanently

closed window

* 12”

Vertical clearance to ventilated soffit

located above the terminal within a

horizontal distance of 2 feet (610 mm)

from the center line of the terminal

* Equal to or greater than soffit depth.

E =

F =

Clearance to unventilated soffit

Clearance to outside corner

* Equal to or greater than soffit depth.

* No minimum to outside corner

G = Clearance to inside corner

H = Clearance to each side of center line ex-

tended above meter / regulator assembly

3 feet (.9m) within a height 15 feet (4.5m) 3 feet (.9m) within a height 15 feet (4.5m)

above the meter / regulator assembly

I =

Clearance to service regulator

vent outlet

3 feet (.9m)

* 3 feet (.9m)

J =

Clearance to non-mechanical air

supply inlet to building or the com-

bustion air inlet to any other ap-

pliance

6 inches (152mm) for appliances <10,000

Btuh (3kw), 12 inches (305mm) for

appliances > 10,000 Btuh (3kw) and

<100,000 Btuh (30kw), 36 inches (.9m)

for appliances > 100,000 Btuh (30kw)

4 feet (1.2 m) below or to side of opening;

1 foot (30 cm) above opening

K =

L =

Clearance to mechanical air sup-

ply inlet

3 feet (.9m) above if within 10 feet

(3m) horizontally

6 feet (1.8m)

Clearance above paved sidewalk or

paved driveway located on public property

7 feet (2.1m)†

M = Clearance under veranda, porch, deck or balcony

12 inches (305mm)‡

*12 inches (305mm)‡

In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code

In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code

*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA

B149.1, clearance will be in accordance with local installation

codes and the requirements of the gas supplier and these instal-

lation instructions.”

† A vent shall not terminate directly above a sidewalk or paved driveway that is

located between two single family dwellings and serves both dwellings.

‡ Permitted only if veranda, porch, deck or balcony is fully open

on a minimum of two sides beneath the floor. Lennox recommends

avoiding this location if possible.

FIGURE 30

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VENT TERMINATION CLEARANCES

FOR DIRECT VENT INSTALLATIONS IN THE US AND CANADA

INSIDE CORNER

DETAIL

Fixed

Closed

Operable

Fixed

Closed

Operable

AREA WHERE TERMINAL

IS NOT PERMITTED

AIR SUPPLY INLET

VENT TERMINAL

US Installations

Canadian Installations

A =

Clearance above grade, veranda,

porch, deck or balcony

12 inches (305mm) or 12 in. (305mm)

above average snow accumulation.

12 inches (305mm) or 12 in. (305mm)

above average snow accumulation.

B =

Clearance to window or

door that may be opened

6 inches (152mm) for appliances <10,000 6 inches (152mm) for appliances <10,000

Btuh (3kw), 9 inches (228mm) for ap-

pliances > 10,000 Btuh (3kw) and <50,000

Btuh (15 kw), 12 inches (305mm) for ap-

pliances > 50,000 Btuh (15kw)

Btuh (3kw), 12 inches (305mm) for

appliances > 10,000 Btuh (3kw) and

<100,000 Btuh (30kw), 36 inches (.9m)

for appliances > 100,000 Btuh (30kw)

* 12”

C =

D =

Clearance to permanently

closed window

* 12”

Vertical clearance to ventilated soffit

located above the terminal within a

horizontal distance of 2 feet (610mm)

from the center line of the terminal

* Equal to or greater than soffit depth

* No minimum to outside corner

E =

F =

G =

Clearance to unventilated soffit

Clearance to outside corner

Clearance to inside corner

* No minimum to outside corner

H = Clearance to each side of center line ex-

tended above meter / regulator assembly

3 feet (.9m) within a height 15 feet (4.5m)

above the meter / regulator assembly

3 feet (.9m) within a height 15 feet (4.5m)

above the meter / regulator assembly

I =

Clearance to service regulator

vent outlet

3 feet (.9m)

* 3 feet (.9m)

J =

Clearance to non-mechanical air

supply inlet to building or the com-

bustion air inlet to any other ap-

pliance

6 inches (152mm) for appliances <10,000 6 inches (152mm) for appliances <10,000

Btuh (3kw), 9 inches (228mm) for ap-

pliances > 10,000 Btuh (3kw) and <50,000

Btuh (15 kw), 12 inches (305mm) for ap-

pliances > 50,000 Btuh (15kw)

Btuh (3kw), 12 inches (305mm) for

appliances > 10,000 Btuh (3kw) and

<100,000 Btuh (30kw), 36 inches (.9m)

for appliances > 100,000 Btuh (30kw)

K =

L =

Clearance to mechanical air sup-

ply inlet

3 feet (.9m) above if within 10 feet

(3m) horizontally

6 feet (1.8m)

Clearance above paved sidewalk or

paved driveway located on public property

7 feet (2.1m)†

* 7 feet (2.1m)

M = Clearance under veranda, porch, deck or balcony

*12 inches (305mm)‡

12 inches (305mm)‡

In accordance with the current ANSI Z223.1/NFPA 54 Natural Fuel Gas Code

*For clearances not specified in ANSI Z223.1/NFPA 54 or CSA

B149.1, clearance will be in accordance with local installation

codes and the requirements of the gas supplier and these

installation instructions.”

In accordance with the current CSA B149.1, Natural Gas and Propane Installation Code

† A vent shall not terminate directly above a sidewalk or paved driveway that is located

between two single family dwellings and serves both dwellings.

‡ Permitted only if veranda, porch, deck or balcony is fully open on a minimum of

two sides beneath the floor. Lennox recommends avoiding this location if possible.

FIGURE 31

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Details of Intake and Exhaust Piping Terminations for

Direct Vent Installations

3”(76MM) MAX.

SIZE TERMINATION

PIPE PER TABLE 8.

Inches(MM)

NOTE - In Direct Vent installations, combustion air is tak-

en from outdoors and flue gases are discharged to out-

doors.

UNCONDITIONED

ATTIC SPACE

8” (203MM) MIN

1/2” (13MM) FOAM

INSULATION IN

UNCONDITIONED

SPACE

NOTE - Flue gas may be slightly acidic and may adversely

affect some building materials. If any vent termination is

used and the flue gasses may impinge on the building ma-

terial, a corrosion-resistant shield (minimum 24 inches

square) should be used to protect the wall surface. If the

optional tee is used, the protective shield is recommended.

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 35.

12” (305MM) ABOVE

AVERAGE SNOW

ACCUMULATION

3” (76MM) OR

2” (51MM) PVC

PROVIDE SUPPORT

FOR INTAKE AND

EXHAUST LINES

Intake and exhaust pipes may be routed either horizontally

through an outside wall or vertically through the roof. In at-

tic or closet installations, vertical termination through the

roof is preferred. Figures 32 through 46 show typical

terminations.

DIRECT VENT ROOF TERMINATION KIT

(15F75 or 44J41)

FIGURE 32

Exiting Exhaust and Intake Vent

(different pressure zones)

1 - Intake and exhaust terminations are not required to be

in the same pressure zone. You may exit the intake on

one side of the structure and the exhaust on another

side (figure 33). You may exit the exhaust out the roof

and the intake out the side of the structure (figure 34).

2 - Intake and exhaust pipes should be placed as close

together as possible at termination end (refer to il-

lustrations). Maximum separation is 3” (76MM) on roof

terminations and 6” (152MM) on side wall termina-

tions.

Inlet Air

Exhaust

Pipe

Furnace

(Minimum 12 in.

305 MM) above

grade or snow

accumulation

NOTE - When venting in different pressure zones, the

maximum separation requirement of intake and ex-

haust pipe DOES NOT apply.

FIGURE 33

3 - On roof terminations, the intake piping should termi-

nate straight down using two 90° elbows (See figure

32).

Exiting Exhaust and Intake Vent

(different pressure zones)

4 - Exhaust piping must terminate straight out or up as

shown. A reducer may be required on the exhaust pip-

ing at the point where it exits the structure to improve

the velocity of exhaust away from the intake piping.

See table 8.

Roof T

erminated

Exhaust Pipe

NOTE - Care must be taken to avoid recirculation of ex-

haust back into intake pipe.

Inlet Air

5 - On field-supplied terminations for side wall exit, ex-

haust piping may extend a maximum of 12 inches

(305MM) for 2” PVC and 20 inches (508MM) for 3”

(76MM) PVC beyond the outside wall. Intake piping

should be as short as possible. See figures 36 and 37.

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 36 and 37.

(Minimum 12 in.

305 MM) above

grade or snow

accumulation

Furnace

FIGURE 34

TABLE 8

EXHAUST PIPE TERMINATION SIZE REDUCTION

EL296UHE

MODEL

Termination

Pipe Size

1-1/2” (38MM)

*045 and 070

*090

110

2” (51MM)

135

*EL296UHE-045, -070 and -090 units with the flush mount termination must

use the 1-1/2”accelerator supplied with the kit.

Page 28

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7 - If intake and exhaust piping must be run up a side wall

to position above snow accumulation or other ob-

structions, piping must be supported every 24”

(610MM) as shown in figures 36 and 37. In addition,

close coupled wall termination kits must be extended

for use in this application. See figures 44 and 45.

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 (1.5m) to the equivalent length of the

pipe.

8 - A multiple furnace installation may use a group of up to

four terminations assembled together horizontally, as

shown in figure 41.

Alternate Terminations

(Tee & Forty-Five Degree Elbows Only)

Intake

Front View of

Intake and Exhaust

Exhaust

Intake

Exhaust

TABLE 9

2” (51MM)

Vent Pipe

3” (76MM)

Vent Pipe

A- Clearance above

grade or average snow

accumulation

12” (305MM) Min.

B-Horizontal

separation between

intake and exhaust

6” (152MM) Min. 6” (152MM) Min.

24” (610MM) Max 24” (610MM) Max

12”

C-Minimum from

end of exhaust to

inlet of intake

9” (227MM) Min. 9” (227MM) Min.

12” (305MM) Min.

16” (405MM) Max.

12” (305MM) Min.

20” (508MM) Max.

D-Exhaust pipe length

E-Wall support distance

from top of each pipe

(intake/exhaust)

6” (152MM) Max. 6” (152MM) Max.

The exhaust termination tee should be connected to the 2” or 3” PVC flue pipe as shown in the illustration. Do

not use an accelerator in applications that include an exhaust termination tee. The accelerator is not required.

As required. Flue gas may be acidic and may adversely affect some building materials. If a side wall vent

termination is used and flue 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 recommende-

d. The shield should be constructed using wood, sheet metal or other suitable material. All seams, joints,

cracks, etc. in affected area, should be sealed using an appropriate sealant.

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.

FIGURE 35

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FIELD FABRICATED WALL TERMINATION OR

(15F74) WALL RING TERMINATION KIT

With INTAKE ELBOW

FIELD FABRICATED WALL TERMINATION OR

(15F74) WALL RING TERMINATION KIT

NOTE - FIELD-PROVIDED

REDUCER MAY BE

NOTE - FIELD-PROVIDED

REDUCER MAY BE

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

TO TERMINATION

1/2” (13MM) ARMAFLEX

INSULATION IN UN-

CONDITIONED SPACE

1/2” (13MM) ARMAFLEX

REQUIRED TO ADAPT

INSULATION IN UN-

LARGER VENT PIPE SIZE

CONDITIONED SPACE

TO TERMINATION

SIZE TERMINATION

PER TABLE 8

SIZE TERMINATION

PER TABLE 8

STRAIGHT

APPPLICATION

STRAIGHT

APPPLICATION

1/2” (13MM) ARMAFLEX INSULATION

IN UNCONDITIONED SPACE

1/2” (13MM) ARMAFLEX INSULATION

IN UNCONDITIONED SPACE

* WALL

SUPPORT

* WALL

SUPPORT

EXTENDED

APPLICATION

EXTENDED

APPLICATION

See venting table 5 for maximum venting lengths with this

arrangement.

See venting table 5 for maximum venting lengths with this

arrangement.

* Use wall support every 24” (610MM). Use two wall supports if

extension is greater than 24” (610MM) but less than 48” (1219 MM).

NOTE - One wall support must be 6” (152MM) from top of each pipe

(intake and exhaust)

* Use wall support every 24” (610MM). Use two wall supports if

extension is greater than 24” (610MM) but less than 48” (1219 MM).

NOTE - One wall support must be 6” (152MM) from top of each pipe

(intake and exhaust)

2” (51MM)

Vent Pipe

3” (76MM)

Vent Pipe

2” (51MM)

Vent Pipe

3” (7MM)

Vent Pipe

A-Minimum clearance

above grade or average

snow accumulation

A-Minimum clearance

above grade or average

snow accumulation

12” (305MM)

6” (152MM)

8” (203MM)

12” (305MM)

6” (152MM)

8” (203MM)

B-Maximum horizontal

separation between

intake and exhaust

B-Maximum horizontal

separation between

intake and exhaust

6” (152MM)

C-Minimum from

end of exhaust to

inlet of intake

C-Minimum from

end of exhaust to

inlet of intake

6” (152MM)

20” (508MM)

6” (152MM)

12” (305MM)

6” (152MM)

D-Maximum exhaust

pipe length

D-Maximum exhaust

pipe length

12” (305MM)

6” (152MM)

20” (508MM)

6” (152MM)

E-Maximum wall support

distance from top of each

pipe (intake/exhaust)

E-Maximum wall support

distance from top of each

pipe (intake/exhaust)

FIGURE 37

FIGURE 36

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2” EXTENSION FOR 2” PVC

PIPE1” EXTENSION FOR 3”

PVC PIPE

12”

(305MM)

5-1/2”

(140mm)

EXHAUST

VENT

FURNACE

EXHAUST

PIPE

5”

(127MM)

4''

INTAKE

AIR

18” MAX.

(457MM)

FURNACE

INTAKE

PIPE

Front View

EXHAUST VENT

12” (305MM) Min.

above grade or

average snow

accumulation.

GLUE EXHAUST

END FLUSH INTO

TERMINATION

Inches (MM)

INTAKE

AIR

FLAT

SIDE

1-1/2” ACCELERATOR

(all -45, -070 and -090 units)

optional intake elbow

FLUSH-MOUNT SIDE WALL TERMINATION

51W11 (US) or 51W12 (Canada)

Side View

OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT

INSTALLATION OF DIRECT VENT WALL TERMINATION KIT

(22G44, 44J40, 30G28 or 81J20)

FIGURE 38

FIGURE 41

1 1/2” (38mm) accelerator

EXHAUST VENT

provided on 71M80 & 44W92

kits for EL296UH045E36B, &

070E36B

Front View

EXHAUST

VENT

SIZE

TERMINATION

PIPE PER

TABLE 8.

FLASHING

(Not Furnished)

INTAKE

AIR

12” (305mm)

INTAKE

AIR

Minimum

Above Average

Snow

Top View

1/2” (13MM) Foam Insulation

in Unconditioned Space

Accumulation

FIELD-

PROVIDED

SHEET METAL STRAP

EXHAUST VENT

REDUCER MAY

(Clamp and sheet metal strap

must be field installed to support

the weight of the termination kit.)

BE REQUIRED

TO ADAPT

LARGER VENT

INTAKE AIR

CLAMP

PIPE SIZE TO

TERMINATION

FIELD-PROVIDED

6 (152MM) MIN.

REDUCER MAY BE REQUIRED

TO ADAPT LARGER VENT

PIPE SIZE TO TERMINATION

OUTSIDE WALL

DIRECT VENT CONCENTRIC ROOFTOP TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

DIRECT VENT WALL TERMINATION KIT

(30G28 or 81J20)

FIGURE 42

FIGURE 39

EXHAUST VENT

Front View

SIZE

TERMINATION

PIPE PER

TABLE 8.

FIELD-PROVIDED

REDUCER MAY BE REQUIRED

TO ADAPT LARGER VENT

PIPE SIZE TO TERMINATION

1-1/2” (38mm) accelerator

provided on 71M80 & 44W92

kits for EL296UH045E36B, &

070E36B

INTAKE

AIR

OUTSIDE

INTAKE

WALL

AIR

1/2” (13MM) Foam Insulation

in Unconditioned Space

Top View

EXHAUST

VENT

EXHAUST

VENT

FIELD-

PROVIDED

REDUCER MAY

BE REQUIRED

EXHAUST VENT

TO ADAPT

INTAKE AIR

LARGER VENT

12” (305mm) Min.

above grade or

average snow

accumulation.

INTAKE

AIR

INTAKE

AIR

CLAMP

(Not Furnished)

PIPE SIZE TO

TERMINATION

8” (206MM) MIN.

GRADE

DIRECT VENT CONCENTRIC WALL TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

OUTSIDE WALL

DIRECT VENT WALL TERMINATION KIT

(22G44 or 44J40)

FIGURE 40

FIGURE 43

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WALL TERMINATION KITS (CLOSE−COUPLE)

EXTENDED VENT FOR GRADE CLEARANCE

2 inch (51 mm) 22G44 (US)

3 inch (76 mm) 44J40 (US)

If intake and exhaust pipe is less than 12 in. (305 MM)

above snow accumulation or other obstructions, field−

fabricated piping must be installed.

FIELD-PROVIDED

REDUCER MAY BE REQUIRED TO ADAPT

LARGER VENT PIPE SIZE TO TERMINATION

8” (203mm) Min. for 2” (51MM) & 3” (76MM) DIA. pipe

between the end of the exhaust pipe and intake pipe

12” (305MM) Max. for 2” (51MM) Dia. Exhaust

20” (508MM) Max. for 3” (76MM) Dia. Exhaust

WALL SUPPORT*

12”

(305 mm)

EXHAUST

AIR

1/2” (13 mm)

FOAM INSULATION

(Field−Furnished)

6” (152 MM)

Maximum

INTAKE

AIR

EXHAUST

AIR

INTAKE

AIR

5” (127 mm)

12” (305 MM) Minimum

8” (203 mm) Min.

12” (305MM) Minimum

Above Grade or Average

Snow Accumulation

Above Grade or Average

5−1/2”

(140 mm)

Snow Accumulation

GRADE

*Use wall support every 24” (610). Use two supports if

extension is greater than 24” but less than 48”.

12” (305 MM) Max. for 2” (51MM) Dia. Exhaust

20” (508MM) Max. for 3” (76MM) Dia. Exhaust

FIGURE 44

WALL TERMINATION KITS (CLOSE−COUPLE)

EXTENDED VENT FOR GRADE CLEARANCE

2 inch (51 mm) 30G28 (WTK Canada)

3 inch (76 mm) 81J20 (WTK Canada)

See Installation Instructions for additional information.

If intake and exhaust pipe is less than 12 in. (305 MM)

above snow accumulation or other obstructions, field−

fabricated piping must be installed.

FIELD-PROVIDED

REDUCER MAY BE REQUIRED TO ADAPT

LARGER VENT PIPE SIZE TO TERMINATION

WALL SUPPORT*

12” (305 MM) Max. for 2” (51 MM) Dia. Exhaust

20” (508 MM) Max. for 3” (76 MM) Dia. Exhaust

12”

(305 mm)

EXHAUST

AIR

1/2” (13 mm)

FOAM INSULATION

(Field−Furnished)

6” (152 MM)

Maximum

INTAKE

AIR

6” (152 MM)

Minimum

EXHAUST

AIR

INTAKE

AIR

5” (127 mm)

12” (305 MM) Minimum

Above Grade or Average

Snow Accumulation

6” (152 MM)

Minimum

12” (305 MM) Minimum

Above Grade or Average

Snow Accumulation

GRADE

5−1/2”

(140 mm)

GRADE

*Use wall support every 24” (610). Use two supports if

extension is greater than 24” but less than 48”.

12” (305 MM) Max. for 2” (51 MM) Dia. Exhaust

20” (508 MM) Max. for 3” (76 MM) Dia. Exhaust

FIGURE 45

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EL296UHE DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

12” (305MM) MAX. for 2” (51MM)

20” (508MM) MAX. for 3” (76MM)

1/2” (13MM) ARMAFLEX

INSULATION IN

UNCONDITIONED SPACE

STRAIGHT-CUT OR

ANGLE-CUT IN DIRECTION

OF ROOF SLOPE *

3”-8”

(76MM-203MM)

1/2” (13MM)

ARMAFLEX

INSULATION

FIELD-PROVIDED

REDUCER MAY

BE REQUIRED TO

ADAPT LARGER

VENT PIPE SIZE

TO TERMINATION

EXHAUST VENT

1/2” (13MM)

WEATHERPROOF

INSULATION

8” - 12”

(203MM - 305MM)

PVC REDUCER

12” MIN.

(305MM)

Above Grade or

average snow

accumulation

SHOULDER OF FITTINGS

PROVIDE SUPPORT

OF PIPE ON TOP PLATE

Minimum 12” (305MM)

INTAKE PIPE

INSULATION (optional)

SIZE TERMINATION

PIPE PER TABLE 8.

above chimney top

plate or average snow

accumulation

SHEET

METAL TOP

PLATE

ALTERNATE

INTAKE PIPE

3” - 8”

(76MM-

203MM)

NON-DIRECT VENT FIELD SUPPLIED WALL TERMINATION OR

(15F74) WALL TERMINATION KIT

INSULATE

TO FORM

SEAL

EXTERIOR

PORTION OF

CHIMNEY

FIGURE 48

3 - If exhaust piping must be run up a side wall to position

above snow accumulation or other obstructions, pip-

ing must be supported every 24 inches (610MM) as

shown in figure 49. When exhaust piping must be run

up an outside wall, any reduction in exhaust pipe size

must be done after the final elbow.

*SIZE TERMINATION

PIPE PER TABLE 8.

NOTE - Do not discharge exhaust gases directly into any chimney or vent stack. If ver-

tical discharge through an existing unused chimney or stack is required, insert piping

inside chimney until the pipe open end is above top of chimney and terminate as illus-

trated. In any exterior portion of chimney, the exhaust vent must be insulated.

FIGURE 46

12” (305MM) MAX. for 2” (51MM)

20” (508MM) MAX. for 3” (76MM)

UNCONDITIONED

SPACE

Details of Exhaust Piping Terminations for Non‐Direct

Vent Applications

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 pre-

ferred. Figures 47 through 50 show typical terminations.

1 - Exhaust piping must terminate straight out or up as

shown. The termination pipe must be sized as listed in

table 8.The specified pipe size ensures proper veloc-

ity required to move the exhaust gases away from the

building.

6” (152MM)

Max

SIZE TER-

MINATION

PIPE PER

TABLE 8.

*WALL SUPPORT

OUTSIDE WALL

FIELD-PROVIDED

12” (305MM)

REDUCER MAY BE

REQUIRED TO

ADAPT LARGER

VENT PIPE SIZE TO

TERMINATION

ABOVE GRADE OR

AVERAGE SNOW

ACCUMULATION

1/2” (13MM) FOAM

INSULATION IN

UNCONDITIONED

SPACE

2 - On field supplied terminations for side wall exit, ex-

haust piping may extend a maximum of 12 inches

(305MM) for 2” PVC and 20 inches (508MM) for 3”

(76MM) PVC beyond the outside wall. See figure 48.

1/2” (13MM) FOAM

INSULATION

NON-DIRECT VENT FIELD SUPPLIED WALL TERMINATION

EXTENDED OR (15F74) WALL TERMINATION VENT PIPE

EXTENDED

*Use wall support every 24” (610). Use two supports if extension is

greater than 24” but less than 48”.

SIZE TERMINATION

PIPE PER TABLE 8.

12” (305MM)

ABOVE AVE.

SNOW

ACCUMULATION

FIGURE 49

1/2” (13MM) FOAM

INSULATION

3” (76MM) OR

2” (51MM) PVC

UNCONDITIONED

ATTIC SPACE

PROVIDE SUPPORT

FOR EXHAUST LINES

NON-DIRECT VENT ROOF TERMINATION KIT

(15F75 or 44J41)

FIGURE 47

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CONDENSATE TRAP AND PLUG LOCATIONS

(Unit shown in upflow position)

Trap

EL296UHE NON-DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

STRAIGHT-CUT OR

ANGLE-CUT IN DIRECTION

OF ROOF SLOPE

SIZE TERMINATION

PIPE PER TABLE 8.

(same on

right side)

1-1/2 in.

EXHAUST VENT

1/2” (13MM)

WEATHERPROOF

Minimum 12” (305MM)

above chimney top

INSULATION

plate or average snow

accumulation

Plug

(same on left side)

SHOULDER OF FITTINGS

PROVIDE SUPPORT

OF PIPE ON TOP PLATE

SHEET

METAL TOP

PLATE

INSULATE

TO FORM

SEAL

EXTERIOR

PORTION OF

CHIMNEY

NOTE - In upflow applications where side return

air filter is installed on same side as the conden-

sate trap, filter rack must be installed beyond

condensate trap or trap must be re-located to

avoid interference.

NOTE - Do not discharge exhaust gases directly into any chimney or vent stack. If ver-

tical discharge through an existing unused chimney or stack is required, insert piping

inside chimney until the pipe open end is above top of chimney and terminate as illus-

trated. In any exterior portion of chimney, the exhaust vent must be insulated.

FIGURE 50

Condensate Piping

This unit is designed for either right‐ or left‐side exit of con-

densate piping in upflow applications. In horizontal applica-

tions, the condensate trap must extend below the unit. An

8” service clearance is required for the condensate trap.

Refer to figures 51 and 53 for condensate trap locations.

Figure 59 shows trap assembly using 1/2” PVC or 3/4”

PVC.

FIGURE 51

5 - Figures 54 and 56 show the furnace and evaporator

coil using a separate drain. If necessary the conden-

sate line from the furnace and evaporator coil can

drain together. See figures 55, 57 and 58.

NOTE - If necessary the condensate trap may be installed

up to 5’ away from the furnace. Use PVC pipe to connect

trap to furnace condensate outlet. Piping from furnace

must slope down a minimum of 1/4” per ft. toward trap.

Upflow furnace (figure 57) - In upflow furnace applica-

tions the field provided vent must be a minimum 1” to a

maximum 2” length above the condensate drain outlet

connection. Any length above 2” may result in a

flooded heat exchanger if the combined primary drain

line were to become restricted.

1 - Determine which side condensate piping will exit the

unit, location of trap, field-provided fittings and length of

PVC pipe required to reach available drain.

Horizontal furnace (figure 58) - In horizontal furnace

applications the field provided vent must be a mini-

mum 4” to a maximum 5” length above the condensate

drain outlet connection. Any length above 5” may re-

sult in a flooded heat exchanger if the combined pri-

mary drain line were to become restricted.

2 - Use a large flat head screw driver or a 1/2” drive socket

extension and remove plug (figure 51) from the cold

end header box at the appropriate location on the side

of the unit. Install provided 3/4 NPT street elbow fitting

into cold end header box. Use Teflon tape or appropri-

ate pipe dope.

3 - Install the cap over the clean out opening at the base

of the trap. Secure with clamp. See figure 59.

NOTE - In horizontal applications it is recommended to

install a secondary drain pan underneath the unit and

trap assembly.

4 - Install drain trap using appropriate PVC fittings, glue

all joints. Glue the provided drain trap as shown in fig-

ure 59. Route the condensate line to an open drain.

Condensate line must maintain a 1/4” downward slope

from the furnace to the drain.

NOTE - Appropriately sized tubing and barbed fitting

may be used for condensate drain. Attach to the drain

on the trap using a hose clamp. See figure 52.

Page 34

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Field Provided Drain Components

EL296UHE With Evaporator

Coil Using A Separate Drain

Evaporator drain

line required

Elbow

Field Provided Vent

(1” min. 2” max. above

condensate connection)

Barbed Fitting

Hose Clamp

FIGURE 52

Tubing

Condensate

DrainConnection

CAUTION

Donot use copper tubing or existing copper conden-

sate lines for drain line.

6 - If unit will be started immediately upon completion of

installation, prime trap per procedure outlined in Unit

Start-Up section.

FIGURE 54

Condensate line must slope downward away from the

trap to drain. If drain level is above condensate trap,

condensate pump must be used. Condensate drain

line should be routed within the conditioned space to

avoid freezing of condensate and blockage of drain

line. If this is not possible, a heat cable kit may be used

on the condensate trap and line. Heating cable kit is

available from Lennox in various lengths; 6 ft. (1.8m) -

kit no. 26K68; 24 ft. (7.3m) - kit no. 26K69; and 50 ft.

(15.2m) - kit no. 26K70.

CONDENSATE TRAP LOCATIONS

(Unit shown in upflow position with remote trap)

Condensate Trap With Optional Overflow Switch

From Evaporator Coil

Horizontal Furnace Min.to 5” Max.above

4”

FieldProvidedVent

Min.1” AboveCondensate

DrainConnection

condensate drain connection)

1” Min.

2” Max.

FurnaceCondensate

DrainConnection

*5’ max.

PVCPipeOnly

Optional

Trap can be installed a

maximum 5' from furnace

To Drain

*Piping from furnace must slope down a minimum of

1/4” per ft. toward trap.

FIGURE 55

FIGURE 53

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EL296UHE with Evaporator Coil Using a Separate Drain

(Unit shown in horizontal left-hand discharge position)

Field Provided Vent

(4” min. to 5” max. above

condensate connection)

Evaporator

Coil

4”min

5”max

5’ max.

PVC Pipe Only

Condensate

DrainConnection

Drain Pan

Piping from furnace and evaporator coil must slope down a minimum 1/4” per ft. toward trap

FIGURE 56

EL296UHE with Evaporator

Coil Using a Common Drain

IMPORTANT

Evaporator drain

line required

When combining the furnace and evaporator

coil drains together, the A/C condensate drain

outlet must be vented to relieve pressure in or-

der for the furnace pressure switch to operate

properly.

(1”min. to 2” Max.above

condensate drain connection)

Condensate

DrainConnection

FIGURE 57

EL296UHE with Evaporator Coil Using a Common Drain

(Unit shown in horizontal left−hand discharge position)

(4”min. to 5” Max.above

condensate drain connection)

Evaporator

Coil

4”min

5”max

5’ max.

PVC Pipe Only

Condensaet Drain

Connection

Drain Pan

Piping from furnace and evaporator coil must slope down a minimum 1/4” per ft. toward trap

FIGURE 58

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TRAP / DRAIN ASSEMBLY USING 1/2” PVC OR 3/4” PVC

Optional Condensate Drain Connection

Adapter 3/4 inch slip X

3/4 inch mpt (not furnished)

90° Street Elbow

3/4 inch PVC

(not furnished)

Adapter 3/4 inch slip X

3/4 inch mpt (not furnished)

Condensate Drain

Connection In Unit

1 (25 mm) Min.

2 (50 mm) Max.

Above Top Of

Condensate Drain

Connection In Unit

Vent

5 Feet

Maximum

Condensate Drain

Connection In Unit

90° Street Elbow

3/4 inch PVC

( furnished)

90° Elbow 3/4 inch PVC

(Not Furnished)

Trap

3/4 inch PVC Pipe

(Not Furnished)

1/2 inch PVC Pipe

(Not Furnished)

OptionalDrainPipingFromTrap

Coupling 3/4 inch slip X slip

(Not Furnished)

Drain Assembly for 1/2 inch Drain Pipe

1/2 inch PVC Pipe

(Not Furnished)

Drain Trap

Assembly

(Furnished)

90° Elbow

1/2 inch PVC

(Not Furnished)

Drain

Drain Assembly for 3/4 inch Drain Pipe

Drain Trap

Clean Out

90° Elbow

3/4 inch PVC

(Not Furnished)

3/4 inch PVC

(Not Furnished)

Drain

Coupling 3/4 inch slip X slip

(Not Furnished)

DrainTrap Assembly with 3/4 inch Piping

DrainTrap Assembly with 1/2 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top

Of Condensate Drain Connection In Unit

1 (25 mm) Min. 2 (50 mm) Max. Above Top

Of Condensate Drain Connection In Unit

Vent

DrainTrapAssembly

(Furnished)

Vent

3/4 inch

1/2 inch

Condensate Drain

Connection In Unit

Condensate Drain

Connection In Unit

(178)

Drain

FIGURE 59

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6 - In some localities, codes may require installation of a

manual main shut‐off valve and union (furnished by in-

staller) external to the unit. Union must be of the

ground joint type.

Gas Piping

Gas supply piping should not allow more than 0.5”W.C. drop

in pressure between gas meter and unit. Supply gas pipe

must not be smaller than unit gas connection.

IMPORTANT

Compounds used on threaded joints of gas piping

must be resistant to the actions of liquified petro-

leum gases.

CAUTION

If a flexible gas connector is required or allowed by

the authority that has jurisdiction, black iron pipe

shall be installed at the gas valve and extend outside

the furnace cabinet. The flexible connector can then

be added between the black iron pipe and the gas

supply line.

Leak Check

After gas piping is completed, carefully check all piping

connections (factory- and field-installed) for gas leaks. Use

a leak detecting solution or other preferred means.

Never use an open flame to test for gas leaks. Check all

connections using a commercially available soap solution

made specifically for leak detection.

The furnace must be isolated from the gas supply system

by closing its individual manual shut‐off valve during any

pressure testing of the gas supply system at pressures

greater than or equal to 1/2 psig (3.48 kPa, 14 inches w.c.).

WARNING

Do not exceed 600 in-lbs (50 ft-lbs) torque when at-

taching the gas piping to the gas valve.

MANUAL MAIN SHUT-OFF

VALVE WILL NOT HOLD

NORMAL TEST PRESSURE

CAP

FURNACE

1 - Gas piping may be routed into the unit through either

the left‐ or right‐hand side. Supply piping enters into

the gas valve from the side of the valve as shown in

figure 61.

ISOLATE

GAS VALVE

1/8” N.P.T.

PLUGGED TAP

2 - When connecting gas supply, factors such as length of

run, number of fittings and furnace rating must be con-

sidered to avoid excessive pressure drop. Table 10

lists recommended pipe sizes for typical applications.

FIGURE 60

NOTE - Use two wrenches when connecting gas pip-

ing to avoid transferring torque to the manifold.

IMPORTANT

When testing pressure of gas lines, gas valve must

be disconnected and isolated. See figure 60. Gas

valves can be damaged if subjected to pressures

greater than 1/2 psig (3.48 kPa).

3 - Gas piping must not run in or through air ducts, clothes

chutes, chimneys or gas vents, dumb waiters or eleva-

tor shafts. Center gas line through piping hole. Gas

line should not touch side of unit. See figures 61 and

62.

4 - Piping should be sloped 1/4 inch per 15 feet (6mm per

5.6m) upward toward the gas meter from the furnace.

The piping must be supported at proper intervals, ev-

ery 8 to 10 feet (2.44 to 3.05m), using suitable hangers

or straps. Install a drip leg in vertical pipe runs to serve as

a trap for sediment or condensate.

WARNING

FIRE OR EXPLOSION HAZARD

Failure to follow the safety warnings exactly could

result in serious injury, death, or property damage.

Never use an open flame to test for gas leaks. Check

all connections using a commercially available soap

solution made specifically for leak detection. Some

soaps used for leak detection are corrosive to cer-

tain metals. Carefully rinse piping thoroughly after

leak test has been completed.

5 - A 1/8” N.P.T. plugged tap or pressure post is located

on the gas valve to facilitate test gauge connection.

See figure 66.

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Left Side Piping

(Standard)

Right Side Piping

(Alternate)

MANUAL

MAIN SHUT-OFF

VALVE

MANUAL

MAIN SHUT-OFF

VALVE

GROUND

JOINT

UNION

GROUND

JOINT

UNION

DRIP LEG

Gas Valve

DRIP LEG

FIELD

PROVIDED

AND INSTALLED

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

FIGURE 61

Horizontal Applications

Possible Gas Piping Configurations

MANUAL

MAIN SHUT-OFF

VALVE

Horizontal Application

Left-Side Air Discharge

MANUAL

MAIN SHUT-OFF

VALVE

GROUND

JOINT

UNION

GROUND

JOINT

UNION

DRIP LEG

Gas Valve

Horizontal Application

Right-Side Air Discharge

MANUAL

MAIN SHUT-OFF

VALVE

Gas Valve

GROUND

JOINT

UNION

FIELD

PROVIDED

AND INSTALLED

DRIP LEG

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

FIGURE 62

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TABLE 10

GAS PIPE CAPACITY - FT³/HR (kL/HR)

Nominal

Iron Pipe

Size

inches

(mm)

Length of Pipe - feet (m)

Internal

Diameter

inches

(mm)

(3.048)

(6.096)

(9.144)

100

(12.192) (15.240) (18.288) (21.336) (24.384) (27.432) (30.480)

1/2

(12.7)

.622

(17.799)

172

(4.87)

118

(3.34)

(2.69)

(2.29)

(2.03)

(1.84)

(1.69)

(1.58)

(1.47)

(1.42)

3/4

(19.05)

.824

(20.930)

360

(10.19)

247

(7.00)

199

(5.63)

170

(4.81)

151

(4.28)

137

(3.87)

126

(3.56)

117

(3.31)

110

(3.11)

104

(2.94)

(25.4)

1.049

(26.645)

678

(19.19)

466

(13.19)

374

(10.59)

320

(9.06)

284

(8.04)

257

(7.27)

237

(6.71)

220

(6.23)

207

(5.86)

195

(5.52)

1-1/4

(31.75)

1.380

(35.052)

1350

(38.22)

957

(27.09)

768

(22.25)

657

(18.60)

583

(16.50)

528

(14.95)

486

(13.76)

452

(12.79)

424

(12.00)

400

(11.33)

1-1/2

(38.1)

1.610

(40.894)

2090

(59.18)

1430

(40.49)

1150

(32.56)

985

(27.89)

873

(24.72)

791

(22.39)

728

(20.61)

677

(19.17)

635

(17.98)

600

(17.00)

(50.8)

2.067

(52.502)

4020

(113.83)

2760

(78.15)

2220

(62.86)

1900

(53.80)

1680

(47.57)

1520

(43.04)

1400

(39.64)

1300

(36.81)

1220

(34.55)

1160

(32.844)

2-1/2

(63.5)

2.469

(67.713)

6400 4400

(181.22) (124.59)

3530

(99.95)

3020

(85.51)

2680

(75.88)

2480

(70.22)

2230

(63.14)

2080

(58.89)

1950

(55.22)

1840

(52.10)

(76.2)

3.068

(77.927)

11300 7780

(319.98) (220.30) (176.98) (151.49) (134.22) (121.47) (111.85) (103.92)

6250

5350

4740

4290

3950

3670

3450

(97.69)

3260

(92.31)

NOTE - Capacity given in cubic feet of gas per hour (kilo liters of gas per hour) and based on 0.60 specific gravity gas.

The unit is equipped with a field make-up box. The make-

up box may be moved to the right side of the furnace to fa-

cilitate installation. Secure the excess wire to the existing

harness to protect it from damage.

Electrical

ELECTROSTATIC DISCHARGE (ESD)

Refer to figure 64 for field wiring, schematic wiring diagram

and troubleshooting.

Precautions and Procedures

The power supply wiring must meet Class I restrictions.

Protected by either a fuse or circuit breaker, select circuit

protection and wire size according to unit nameplate.

CAUTION

Electrostatic discharge can affect elec-

tronic components. Take precautions

to neutralize electrostatic charge by

touching your hand and tools to metal

prior to handling the control.

NOTE - Unit nameplate states maximum current draw.

Maximum Over-Current Protection allowed is 15 AMP.

Holes are on both sides of the furnace cabinet to facilitate

wiring.

Install a separate (properly sized) disconnect switch near

the furnace so that power can be turned off for servicing.

INTERIOR MAKE-UP BOX INSTALLATION

Before connecting the thermostat check to make sure the

wires will be long enough for servicing at a later date. Make

sure that thermostat wire is long enough to facilitate future

removal of blower for service.

remove and relocate

plug to unused

opening on left side

MAKE-UP

BOX

Complete the wiring connections to the equipment. Use the

provided unit wiring diagram and the field wiring diagram

shown in figure 64. Use 18-gauge wire or larger that is suit-

able for Class II rating for thermostat connections.

Electrically ground the unit according to local codes or, in

the absence of local codes, according to the current Na-

tional Electric Code (ANSI/NFPA No. 70) for the USA and

current Canadian Electric Code part 1 (CSA standard

C22.1) for Canada. A green ground wire is provided in the

field make-up box.

Right Side

NOTE - The EL296UHE furnace contains electronic

components that are polarity sensitive. Make sure that the

furnace is wired correctly and is properly grounded.

FIGURE 63

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Accessory Terminals

D The furnace integrated control requires both polarity

and proper ground. Both polarity and proper grounding

should be checked before attempting to operate the

furnace on either permanent or temporary power.

D Generator should have a wave form distortion of less

than 5% THD (total harmonic distortion).

One line voltage “ACC” 1/4” spade terminal is provided on

the furnace integrated control. See figure 65 for integrated

control configuration. This terminal is energized when the

indoor blower is operating. Any accessory rated up to one

amp can be connected to this terminal with the neutral leg

of the circuit being connected to one of the provided neutral

terminals. If an accessory rated at greater than one amp is

connected to this terminal, it is necessary to use an exter-

nal relay.

On-Board Links and Diagnostic Push

Button (Figure 65)

WARNING

Carefully review all configuration information pro-

vided. Failure to properly set DIP switches, jumpers

and on-board links can result in improper operation!

An unpowered, normally open (dry) set of contacts with a

1/4” spade terminal “HUM” are provided for humidifier con-

nections and may be connected to 24V or 120V. Any hu-

midifier rated up to one amp can be connected to these ter-

minals. In 120V humidifier applications the neutral leg of

the circuit can be connected to one of the provided neutral

terminals. This terminal is energized in the heating mode.

On-Board Link W914 Dehum

On-board link W914, is a clippable connection between ter-

minals R and DS on the integrated control. W914 must be

cut when the furnace is installed with a thermostat which

features humidity control. If the link is not cut, terminal “DS”

will remain energized not allowing the blower to reduce to

low cool speed upon a call for dehumidification.

Install the room thermostat according to the instructions

provided with the thermostat. See figure 64 for thermostat

designations. If the furnace is being matched with a heat

pump, refer to the FM21 installation instruction or appropri-

ate dual fuel thermostat instructions.

On-Board Link W951 Heat Pump (R to O)

On-board link W951 is a clippable connection between ter-

minals R and O on the integrated control. W951 must be cut

when the furnace is installed in applications which include a

heat pump unit and a thermostat which features dual fuel

use. If the link is left intact, terminal “O” will remain ener-

gized eliminating the HEAT MODE in the heat pump.

Indoor Blower Speeds

1 - When the thermostat is set to “FAN ON,” the indoor

blower will run continuously on the field selectable fan

speed (“LOW HEAT” is default) when there is no cool-

ing or heating demand.

On-Board Link W915 2 Stage Compr (Y1 to Y2)

On-board link W915 is a clippable connection between ter-

minals Y1 and Y2 on the integrated control. W915 must be

cut if two-stage cooling will be used. If the Y1 to Y2 link is

not cut the outdoor unit will operate in second-stage cool-

ing only.

2 - When the EL296UHE is running in the heating mode,

the indoor blower will run on the 'LOW HEAT” or “HIGH

HEAT” speed per demand.

3 - When there is a cooling demand, the indoor blower will

run on the “LOW COOL” or “HIGH COOL” speed per

demand.

Diagnostic Push Button

The diagnostic push button is located adjacent to the

seven-segment diagnostic LED. This button is used to en-

able the Error Code Recall “E” mode and the Flame Signal

“F” mode. Press the button and hold it to cycle through a

menu of options. Every five seconds a new menu item will

be displayed. When the button is released, the displayed

item will be selected. Once all items in the menu have been

displayed, the menu resumes from the beginning until the

button is released.

Generator Use - Voltage Requirements

The following requirements must be kept in mind when

specifying a generator for use with this equipment:

D The furnace requires 120 volts + 10% (Range: 108

volts to 132 volts).

D The furnace operates at 60 Hz + 5% (Range: 57 Hz to

63 Hz).

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TYPICAL EL296UHE WIRING DIAGRAM

FIGURE 64

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Integrated Control

HUM

ACC

24VAC Indoor

Blower Terminals

Ignitor and Combustion

Air Inducer

Neutrals

Flame Sense

LED

S4 DIP Switches

Diagnostic Push

Button

On Board Links

THERMOSTAT CONNECTIONS (TB1)

DS = DEHUMIDIFICATION SIGNAL

3/16” QUICK CONNECT TERMINALS

FLAME SENSE SIGNAL

HI COOL 24VAC

W2 = HEAT DEMAND FROM 2ND STAGE T/STAT

W1 = HEAT DEMAND FROM 1ST STAGE T/STAT

R = CLASS 2 VOLTAGE TO THERMOSTAT

G = MANUAL FAN FROM T'STAT

HI HEAT 24VAC

LO COOL 24VAC

LO HEAT 24VAC

C = THERMOSTAT SIGNAL GROUND CONNECTED TO

TRANSFORMER GRD (TR) & CHASIS GROUND (GRD)

PARK

COMMON 24VAC

Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL

Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL

1/4” QUICK CONNECT TERMINALS

O = THERMOSTAT SIGNAL TO HEAT PUMP

REVERSING VALVE

NEUTRALS = 120 VAC NEUTRAL

HUM = UNPOWERED NORMALLY OPEN (DRY) CONTACTS

LI = 120 VAC INPUT TO CONTROL

ACC = 120 VAC OUTPUT TO OPTIONAL ACCESSORY

DH = NOT USED

L = NOT USED

FIGURE 65

. . . . . . . . . . . . .

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is shipped from the factory with a blower-off delay of 90 se-

conds. The blower off delay affects comfort and is adjust-

able to satisfy individual applications. Adjust the blower off

delay to achieve a supply air temperature between 90° and

110°F at the exact moment that the blower is de-energized.

Longer off delay settings provide lower supply air tempera-

tures; shorter settings provide higher supply air temperatu-

res.Table 11 provides the blower off timings that will result

from different switch settings.

Integrated Control DIP Switch Settings

EL296UHE units are equipped with a two-stage integrated

control. This control manages ignition timing, heating

mode fan off delays and indoor blower speeds based on

selections made using the control dip switches and jump-

ers. The control includes an internal watchguard feature

which automatically resets the ignition control when it has

been locked out. After one hour of continuous thermostat

demand for heat, the watchguard will break and remake

thermostat demand to the furnace and automatically reset

the control to relight the furnace.

TABLE 11

Blower Off Heating Mode Delay Switch Settings

Blower Off Delay

(Seconds)

Heating Operation DIP Switch Settings

Switch 3

Switch 4

Switch 1 -- Thermostat Selection -- This unit may be

used with either a single-stage or two-stage thermostat.

The thermostat selection is made using a DIP switch which

must be properly positioned for the particular application.

The DIP switch is factory-positioned for use with a two-

stage thermostat. If a single-stage thermostat is to be used,

the DIP switch must be repositioned.

90 (Factory)

120

Off

180

Switch 5 -- Cooling Mode Blower-Off Delay-- The unit is

shipped from the factory with the dip switch positionedOFF

for a 45 second delay. Table 12 provides the cooling mode

off delay settings.

a- Select “OFF” for two-stage heating operation con-

trolled by a two-stage heating thermostat (factory set-

ting);

TABLE 12

Blower Off Cooling Mode Delay Switch Settings

b - Select “ON” for two-stage heating operation con-

trolled by a single-stage heating thermostat. This set-

ting provides a timed delay before second-stage heat

is initiated.

Blower Off Delay

(Seconds)

Switch 5

45 (Factory)

Off

Switch 2 -- Second Stage Delay (Used with Single-

Stage Thermostat Only) -- This switch is used to deter-

mine the second stage on delay when a single-stage ther-

mostat is being used. The switch is factory-set in the OFF

position, which provides a 7-minute delay before second-

stage heat is initiated. If the switch is toggled to the ON

position, it will provide a 12-minute delay before second-

stage heat is initiated. This switch is only activated when

the thermostat selector jumper is positioned for SINGLE-

stage thermostat use.

Switches 6 and 7 -- Continuous Fan Mode -- Continuous

fan speed can be controlled by changing DIP switch posi-

tions. Table 13 below provides DIP switch settings for con-

tinuous fan mode.

TABLE 13

Continuous Fan Mode Settings

Continuous Fan

Mode

Switch 6

Switch 7

Indoor Blower Operation DIP Switch Settings

Low Heat Speed

(factory)

Off

Switches 3 and 4 -- Heating Mode Blower-Off Delay --

The blower-on delay of 30 seconds is not adjustable. The

blower-off delay (time that the blower operates after the

heating demand has been satisfied) can be adjusted by

moving switches 3 and 4 on the integrated control. The unit

Low Cool Speed

High High Speed

High Cool Speed

Off

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TABLE 14

EL296 Field Wiring Applications With Conventional Thermostat

DIP Switch Settings and On-Board Links (See figure 65)

DIP Switch 1

On Board Links Must Be Cut To Select

System Options

Thermostat

Heating

Stages

Thermostat

Wiring Connections

1 Heat / 1 Cool

T'STAT

FURNACE

TERM. STRIP

OUTDOOR

UNIT

NOTE - Use DIP

switch 2 to set

second-stage

heat ON delay.

OFF-7 minutes.

ON-12 minutes.

DO NOT CUT ANY

ON-BOARD LINKS

*Not required on all units

1 Heat / 2 Cool

T'STAT

FURNACE

TERM. STRIP

OUTDOOR

UNIT

NOTE - Use DIP

switch 2 to set

second-stage

heat ON delay.

OFF-7 minutes.

ON-12 minutes.

CUT ON-BOARD LINK

W915

2 STAGE

DEHUM

COMPR

*Not required on all units

1 Heat / 2 Cool

with t'stat with

humidity control

T'STAT

FURNACE

TERM. STRIP

OUTDOOR

UNIT

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

NOTE - Use DIP

switch 2 to set

second-stage

heat ON delay.

OFF-7 minutes.

ON-12 minutes.

CUT ON-BOARD LINK

W914

DEHUM

*Not required on all units

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TABLE 14

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (See figure 65)

DIP Switch 1

On Board Links Must Be Cut To Select

System Options

Thermostat

Heating

Stages

Thermostat

Wiring Connections

2 Heat / 2 Cool

OFF

T'STAT

FURNACE

TERM. STRIP

OUTDOOR

UNIT

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

DEHUM

*Not required on all units

2 Heat / 2 Cool

with t'stat with

humidity control

T'STAT

FURNACE

TERM. STRIP UNIT

OUTDOOR

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

CUT ON-BOARD LINK

W914

DEHUM

*Not required on all units

2 Heat / 1 Cool

with t'stat with

humidity control

T'STAT

FURNACE

TERM. STRIP

OUTDOOR

UNIT

CUT ON-BOARD LINK

W914

DEHUM

*Not required on all units

2 Heat / 1 Cool

T'STAT

FURNACE

TERM. STRIP

OUTDOOR

UNIT

DO NOT CUT ANY

ON-BOARD LINKS

DEHUM

*Not required on all units

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TABLE 14

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (figure 65)

DIP Switch 1

Wiring Connections

Thermostat

Heating

Stages

On Board Links Must Be Cut To Select

System Options

Thermostat

FURNACE

TERM. STRIP

HEAT PUMP

Dual Fuel

Single Stage

Heat Pump

L7724U

T'STAT

OFF

CUT ON-BOARD LINK

W951

HEAT

PUMP

ComfortSense

7000 L7724U

thermostat w/

dual fuel capa-

bilities

67M41*

DEHUM

Capable of 2

stage gas heat

control

L7724U

T'STAT

FURNACE

TERM. STRIP

Dual Fuel

Two Stage

Heat Pump

HEAT PUMP

OFF

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

67M41*

ComfortSense

7000 L7724U

thermostat w/

dual fuel capa-

bilities

Capable of 2

stage gas heat

control

CUT ON-BOARD LINK

W951

DEHUM

HEAT

PUMP

out blue

* Connect W1 to W1 ONLY if using defrost tempering kit 67M41

NOTE - Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the EL296

integrated control.

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TABLE 14

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (figure 65)

DIP Switch 1

Wiring Connections

Thermostat

Heating

Stages

On Board Links Must Be Cut To Select

System Options

Thermostat

FURNACE

TERM. STRIP

HEAT PUMP

Dual Fuel

Single Stage

Heat Pump

L7742U

T'STAT

OFF

CUT ON-BOARD LINK

W951

HEAT

PUMP

ComfortSense

7000 L7742U

thermostat w/

dual fuel capa-

bilities

Capable of 2

stage gas heat

control w/dehu-

midification

control

67M41*

CUT ON-BOARD LINK

W914

DEHUM

FURNACE

TERM. STRIP

HEAT PUMP

Dual Fuel

Two Stage

Heat Pump

L7742U

T'STAT

CUT ON-BOARD LINK

W915

2 STAGE

OFF

COMPR

ComfortSense

7000 L7742U

thermostat w/

dual fuel capa-

bilities

Capable of 2

stage gas heat

control w/dehu-

midification

67M41*

CUT ON-BOARD LINK

W951

HEAT

PUMP

CUT ON-BOARD LINK

W914

DEHUM

out blue

* Connect W1 to W1 ONLY if using defrost tempering kit 67M41

NOTE - Do NOT make a wire connection between the room thermostat L terminal and the L terminal of the EL296

integrated control.

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5 - Wait for the combustion air inducer to stop. Set the

thermostat to initiate a heating demand and again al-

low the burners to fire for approximately 3 minutes.

Unit Start-Up

FOR YOUR SAFETY READ BEFORE OPERATING

6 - Adjust the thermostat to deactivate the heating de-

mand and wait for the combustion air inducer to stop.

At this point, the trap should be primed with sufficient

water to ensure proper condensate drain operation.

WARNING

Do not use this furnace if any part has been under-

water. A flood-damaged furnace is extremely dan-

gerous. Attempts to use the furnace can result in

fire or explosion. Immediately call a qualified ser-

vice technician to inspect the furnace and to replace

all gas controls, control system parts, and electrical

parts that have been wet or to replace the furnace,

if deemed necessary.

WARNING

If you do not follow these instructions exactly, a fire

or explosion may result causing property damage,

personal injury or death.

Gas Valve Operation (Figure 66)

1 - STOP! Read the safety information at the beginning of

this section.

WARNING

2 - Set the thermostat to the lowest setting.

3 - Turn off all electrical power to the unit.

Danger of explosion. Can cause injury

or product or property damage. Should

the gas supply fail to shut off or if

overheating occurs, shut off the gas

valve to the furnace before shutting off

the electrical supply.

4 - This furnace is equipped with an ignition device which

automatically lights the burners. Do not try to light the

burners by hand.

5 - Remove the access panel.

6 - Move gas valve switch to OFF. See figure 66.

7 - Wait five minutes to clear out any gas. If you then smell

gas, STOP! Immediately call your gas supplier from a

neighbor's phone. Follow the gas supplier's instruc-

tions. If you do not smell gas go to next step.

CAUTION

Before attempting to perform any service or mainte-

nance, turn the electrical power to unit OFF at dis-

connect switch.

8 - Move gas valve switch to ON. See figure 66.

HIGH FIRE ADJUSTMENT

SCREW

(under cap)

BEFORE LIGHTING the unit, smell all around the fur-

nace area for gas. Be sure to smell next to the floor be-

cause some gas is heavier than air and will settle on the

floor.

MANIFOLD

PRESSURE POST

INLET PRESSURE POST

The gas valve on the EL296UHE is equipped with a gas

control switch (lever). Use only your hand to move

switch. Never use tools. If the the switch will not move by

hand, do not try to repair it. Force or attempted repair may

result in a fire or explosion.

Placing the furnace into operation:

EL296UHE units are equipped with an automatic hot sur-

face ignition system. Do not attempt to manually light

burners on this furnace. Each time the thermostat calls

for heat, the burners will automatically light. The ignitor

does not get hot when there is no call for heat on these

units.

GAS VALVE SHOWN IN ON POSITION

FIGURE 66

9 - Replace the access panel.

10- Turn on all electrical power to to the unit.

11- Set the thermostat to desired setting.

Priming Condensate Trap

NOTE - When unit is initially started, steps 1 through 11

The condensate trap should be primed with water prior to

start-up to ensure proper condensate drainage. Either

pour 10 fl. oz. (300 ml) of water into the trap, or follow

these steps to prime the trap:

may need to be repeated to purge air from gas line.

12- If the appliance will not operate, follow the instructions

“Turning Off Gas to Unit” and call your service techni-

cian or gas supplier.

1 - Follow the lighting instructions to place the unit into op-

eration.

Turning Off Gas to Unit

2 - Set the thermostat to initiate a heating demand.

1 - Set the thermostat to the lowest setting.

3 - Allow the burners to fire for approximately 3 minutes.

2 - Turn off all electrical power to the unit if service is to be

performed.

4 - Adjust the thermostat to deactivate the heating de-

mand.

3 - Remove the access panel.

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4 - Move gas valve switch to OFF.

Furnace should operate at least 5 minutes before check-

ing gas flow. Determine time in seconds for two revolu-

tions of gas through the meter. (Two revolutions assures a

more accurate time.) Divide by two and compare to time

in table 15. If manifold pressure matches table 17 and rate

is incorrect, check gas orifices for proper size and re-

striction. Remove temporary gas meter if installed.

5 - Replace the access panel.

Failure To Operate

If the unit fails to operate, check the following:

1 - Is the thermostat calling for heat?

2 - Are access panels securely in place?

3 - Is the main disconnect switch closed?

4 - Is there a blown fuse or tripped breaker?

5 - Is the filter dirty or plugged? Dirty or plugged filters will

cause the limit control to shut the unit off.

6 - Is gas turned on at the meter?

NOTE - To obtain accurate reading, shut off all other gas

appliances connected to meter.

Supply Pressure Measurement

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

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

9 - Is the unit ignition system in lockout? If the unit locks out

again, inspect the unit for blockages.

An inlet post located on the gas valve provides access to

the supply pressure. See figure 66. Back out the 3/32 hex

screw one turn, connect a piece of 5/16 tubing and connect

to a manometer to measure supply pressure. See table 17

for supply line pressure.

Heating Sequence Of Operation

1 - When thermostat calls for heat, combustion air inducer

starts.

On multiple unit installations, each unit should be checked

separately, with and without units operating. Supply pres-

sure must fall within range listed in table 17.

2 - Combustion air pressure switch proves blower opera-

tion. Switch is factory set and requires no adjustment.

3 - After a 15-second prepurge, the hot surface ignitor en-

ergizes.

Manifold Pressure Measurement

NOTE - Pressure test adapter kit (10L34) is available from

Lennox to facilitate manifold pressure measurement.

4 - After a 20-second ignitor warm-up period, the gas

valve solenoid opens. A 4-second trial for ignition peri-

od begins.”

A manifold pressure post located on the gas valve provides

access to the manifold pressure. See figure 66. Back out

the 3/32 hex screw one turn, connect a piece of 5/16 tubing

and connect to a manometer to measure manifold pres-

sure.

5 - Gas is ignited, flame sensor proves the flame, and the

combustion process continues.

6 - If flame is not detected after first ignition trial, the igni-

tion control will repeat steps 3 and 4 four more times

before locking out the gas valve (“WATCHGUARD”

flame failure mode). The ignition control will then auto-

matically repeat steps 1 through 6 after 60 minutes.

To interrupt the 60-minute “WATCHGUARD” period,

move thermostat from “Heat” to “OFF” then back to

“Heat”. Heating sequence then restarts at step 1.

To correctly measure manifold pressure, the differential

pressure between the positive gas manifold and the nega-

tive burner box must be considered.

1 - Connect the test gauge positive side “+“ to manifold

pressure tap on gas valve as noted above.

2 - Tee into the gas valve regulator vent hose and connect

to test gauge negative “-”.

Gas Pressure Adjustment

Gas Flow (Approximate)

3 - Ignite unit on low fire and let run for 5 minutes to allow

for steady state conditions.

TABLE 15

GAS METER CLOCKING CHART

Seconds for One Revolution

4 - After allowing unit to stabilize for 5 minutes, record

manifold pressure and compare to value given in table

17.

Natural

EL296

Unit

1 cu ft

Dial

2 cu ft

Dial

1 cu ft

Dial

2 cu ft

DIAL

5 - If necessary, make adjustments. Figure 66 shows

location of high fire and low fire adjustment screws.

-045

-070

-090

-110

-135

160

110

200

136

102

400

272

204

164

136

6 - Repeat steps 3, 4 and 5 on high fire. See values in

table 17.

NOTE - Shut unit off and remove manometer as soon as an

accurate reading has been obtained. Re-start unit and

check gas valve for gas leaks.

Natural-1000 btu/cu ft

LP-2500 btu/cu ft

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Proper Combustion

High Altitude Information

Furnace should operate minimum 15 minutes with correct

manifold pressure and gas flow rate before checking com-

bustion. Take combustion sample beyond the flue outlet

and compare to the tables below.

NOTE - In Canada, certification for installations at eleva-

tions over 4500 feet (1372 m) is the jurisdiction of local au-

thorities.

Units may be installed at altitudes up to 10,000 ft. above

sea level without manifold adjustment. Units installed at al-

titude of 4501 - 10,000 feet (1373 to 3048m) may require a

pressure switch change which can be ordered separately.

Table 18 lists conversion kit and pressure switch require-

ments at varying altitudes.

TABLE 16

CO %

For L.P

For Nat

EL296

Model

Low Fire High Fire Low Fire High Fire

5.4 - 6.4 7.5 - 8.5 6.4 - 7.4 8.8 - 9.8

5.3 - 6.3 7.4 - 8.4 6.3 - 7.3 8.7 - 9.7

5.8 - 6.8 7.6 - 8.6 6.8 - 7.8 8.9 - 9.9

6.1 - 7.1 8.0 - 9.0 7.1 - 8.1 9.3 - 10.3

6.1 - 7.1 7.8 - 8.8 7.1 - 8.2 9.1 - 10.1

045

070

090

110

135

The combustion air pressure switch is factory-set and re-

quires no adjustment.

The maximum carbon monoxide reading should not exceed 50 ppm.

TABLE 17

Manifold and Supply Line Pressure 0-10,000ft.

Manifold Pressure in.wg.

Supply Line Pressure in. w.g.

EL296

Unit

Gas

Low Fire

1.7

High Fire

3.5

Min

4.5

Max

10.5

13.0

Natural

All Sizes

LP/propane

4.9

10.0

11.0

NOTE -

A natural to L.P. propane gas changeover kit is necessary to convert this unit. Refer to the changeover kit installation instruction for the conversion

procedure.

TABLE 18

LP/Propane Conversion Kit and Pressure Switch Requirements at Varying Altitudes

High Altitude

Natural Burner

Orifice Kit

High Altitude

LP/Propane Burner

Orifice Kit

Natural to

LP/Propane

High Altitude Pressure Switch

EL296

Unit

0 - 7500 ft

(0 - 2286m)

7501 - 10,000 ft

(2286 - 3038m)

7501 - 10,000 ft

(2286 - 3038m)

4501 - 7500 ft

(1373 - 2286m)

7501 -10,000 ft

(2286 - 3048m)

-045

-070

-090

-110

-135

93W81

93W80

93W82

93W80

93W83

93W84

93W85

93W80

93W85

*78W93

73W37

*78W96

* Conversion requires installation of a gas valve manifold spring which is provided with the gas conversion kit.

Pressure switch is factory set. No adjustment necessary. All models use the factory-installed pressure switch from 0-4500 feet (0-1370 m).

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Testing for Proper Venting and Sufficient Combustion Air for Non-Direct Vent Applications

horizontal pitch. Determine there is no blockage or re-

striction, leakage, corrosion, or other deficiencies

which could cause an unsafe condition.

WARNING

CARBON MONOXIDE POISONING HAZARD!

3 - To the extent that it is practical, close all building doors

Failure to follow the steps outlined below for each

appliance connected to the venting system being

placed into operation could result in carbon monox-

ide poisoning or death.

and windows and all doors between the space in which

the appliances connected to the venting system are lo-

cated and other spaces of the building.

4 - Close fireplace dampers.

The following steps shall be followed for each ap-

pliance connected to the venting system being

placed into operation, while all other appliances con-

nected to the venting system are not in operation.

5 - Turn on clothes dryers and any appliances not con-

nected to the venting system. Turn on any exhaust

fans, such as range hoods and bathroom exhausts, so

they will operate at maximum speed. Do not operate a

summer exhaust fan.

After the EL296UHE gas furnace has been started, the fol-

lowing test should be conducted to ensure proper venting

and sufficient combustion air has been provided to the

EL296UHE as well as to other gas‐fired appliances which

are separately vented.

6 - Follow the lighting instruction to place the appliance

being inspected into operation. Adjust thermostat so

appliance will operate continuously.

7 - Use the flame of match or candle to test for spillage of

flue gases at the draft hood relief opening after 5 min-

utes of main burner operation.

If a EL296UHE furnace replaces a Category I 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.

8 - If improper venting is observed during any of the

above tests, the venting system must be corrected or

sufficient combustion/make‐up air must be provided.

The venting system should be re‐sized to approach

the minimum size as determined by using the ap-

propriate tables in appendix G in the current standards

of the National Fuel Gas Code ANSI-Z223.1/NPFA 54

in the U.S.A., and the appropriate Natural Gas and

Propane appliances venting sizing tables in the cur-

rent standard of the CSA-B149 Natural Gas and Pro-

pane Installation Codes in Canada.

The test should be conducted while all appliances (both in

operation and those not in operation) are connected to the

venting system being tested. If the venting system has

been installed improperly, or if provisions have not been

made for sufficient amounts of combustion air, corrections

must be made as outlined in the previous section.

9 - After determining that each appliance remaining

connected to the common venting system properly

vents when tested as indicated in step 3, return

doors, windows, exhaust fans, fireplace dampers

and any other gas‐burning appliance to their previous

condition of use.

1 - Seal any unused openings in the venting system.

2 - Visually inspect the venting system for proper size and

Page 52

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NOTE - The ignition control thermostat selection DIP switch is

factory-set in the “TWO-STAGE” position.

Other Unit Adjustments

Applications Using a Two-Stage Thermostat

A - Heating Sequence -- Integrated Control Thermostat

Selection DIP Switch 1 OFF in “Two-Stage” Position

(Factory Setting)

Primary Limit.

The primary limit is located on the heating compartment

vestibule panel. This limit is factory set and requires no ad-

justment.

1 - On a call for heat, thermostat first-stage contacts close

sending a signal to the integrated control. The inte-

grated control runs a self‐diagnostic program and

checks high temperature limit switches for normally

closed contacts and pressure switches for normally

open contacts. The combustion air inducer is ener-

gized at low speed.

Flame Rollout Switches (Two)

These manually reset switches are located on the front of

the burner box.

Pressure Switch

2 - Once the control receives a signal that the low pres-

sure switch has closed, the combustion air inducer be-

gins a 15-second pre-purge in low speed.

The pressure switch is located in the heating compartment

on the cold end header box. This switch checks for proper

combustion air inducer operation before allowing ignition

trial. The switch is factory-set and must not be adjusted.

NOTE - If the low fire pressure switch does not close

the combustion air inducer will switch to high fire. After

a 15 second pre-purge the high fire pressure switch

will close and the unit will begin operation on high fire.

After 10 to 20 seconds of high fire operation the unit

will switch to low fire..

Temperature Rise

Place the unit into operation with a second-stage heating

demand. After supply and return air temperatures have

stabilized, check the temperature rise. If necessary, adjust

the heating blower speed to maintain the temperature rise

within the range shown on the unit nameplate. Increase the

blower speed to decrease the temperature rise. Decrease

the blower speed to increase the temperature rise. Failure

to properly adjust the temperature rise may cause erratic

limit operation.

3 - After the pre-purge is complete, a 20-second initial ig-

nitor warm-up period begins. The combustion air in-

ducer continues to operate at low speed.

4 - After the 20-second warm-up period has ended, the gas

valve is energized on low fire (first stage) and ignition oc-

curs. At the same time, the control module sends a sig-

nal to begin an indoor blower 30-second ON-delay.

When the delay ends, the indoor blower motor is ener-

gized on the low fire heating speed, the HUM contacts

close energizing the humidifier and 120V ACC termi-

nal is energized. The furnace will continue this opera-

tion as long as the thermostat has a first-stage heating

demand.

Electrical

1 - Check all wiring for loose connections.

2 - Check for the correct voltage at the furnace (furnace

operating). Correct voltage is 120VAC + 10%

3 - Check amp-draw on the blower motor with blower ac-

cess panel in place.

Unit Nameplate__________Actual__________

5 - If second-stage heat is required, the thermostat sec-

ond-stage heat contacts close and send a signal to the

integrated control. The integrated control initiates a

30-second second-stage recognition delay.

Exhaust and Air Intake Pipe

1 - Check exhaust and air intake connections for tightness

and to make sure there is no blockage.

6 - At the end of the recognition delay, the integrated con-

trol energizes the combustion air inducer at high

speed. The control also checks the high fire (second

stage) pressure switch to make sure it is closed. The

high fire (second stage) gas valve is energized and the

indoor blower motor is energized for operation at the

high fire heating speed.

2 - Is pressure switch closed? Obstructed exhaust pipe

will cause unit to shut off at pressure switch. Check ter-

mination for blockages.

3 - Obstructed pipe or termination may cause rollout

switches to open. Reset manual flame rollout switches

on burner box assembly if necessary.

7 - When the demand for high fire (second stage) heat is

satisfied, the combustion air inducer is switched to the

low-fire heating speed and the high-fire (second

stage) gas valve is de-energized. The low-fire (first

stage) gas valve continues operation. The indoor

blower motor is switched to the low-fire heating speed.

8 - When the thermostat demand for low-fire (first stage)

heat is satisfied, the gas valve is de-energized and the

field-selected indoor blower off delay begins. The

combustion air inducer begins a 5-second post-purge

period.

Heating Sequence of Operation

Electronic Ignition

The two-stage, variable speed integrated control used in

EL296UHE units has an added feature of an internal Watch-

guard control. The feature serves as an automatic reset de-

vice for ignition control lockout caused by ignition failure. Af-

ter one hour of continuous thermostat demand for heat, the

Watchguard will break and remake thermostat demand to

the furnace and automatically reset the control to begin the

ignition sequence.

9 - When the combustion air post-purge period is com-

plete, the inducer, the HUM contacts as well as the

120V ACC terminals are de-energized. The indoor

blower is de-energized at the end of the off delay.

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Applications Using A Single-Stage Thermostat

B - Heating Sequence -- Integrated Control Thermostat

Selection DIP Switch 1 ON in “Single-Stage” Position

Repair Parts List

The following repair parts are available through Lennox

dealers. When ordering parts, include the complete fur-

nace model number listed on the CSA nameplate -- Exam-

ple: EL296UH045XE24B-01. All service must be per-

formed by a licensed professional installer (or

equivalent), service agency, or gas supplier.

NOTE - In these applications, two-stage heat will be initi-

ated by the integrated control if heating demand has not

been satisfied after the field adjustable period (7 or 12 min-

utes).

1 - On a call for heat, thermostat first-stage contacts close

sending a signal to the integrated control. The inte-

grated control runs a self‐diagnostic program and

checks high temperature limit switches for normally

closed contacts and pressure switches for normally

open contacts. The combustion air inducer is ener-

gized at low speed.

Cabinet Parts

Outer access panel

Blower access panel

Top Cap

2 - Once the control receives a signal that the low pres-

sure switch has closed, the combustion air inducer be-

gins a 15-second pre-purge in low speed.

Control Panel Parts

Transformer

Integrated control board

Door interlock switch

NOTE - If the low fire pressure switch does not close

the combustion air inducer will switch to high fire. After

a 15 second pre-purge the high fire pressure switch

will close and the unit will begin operation on high fire.

After 10 to 20 seconds of high fire operation the unit

will switch to low fire.

Blower Parts

Blower wheel

Motor

Motor mounting frame

Motor capacitor

Blower housing cutoff plate

3 - After the pre-purge is complete, a 20-second initial ig-

nitor warm-up period begins. The combustion air in-

ducer continues to operate at low speed.

Heating Parts

4 - After the 20-second warm-up period has ended, the gas

valve is energized on low fire (first stage) and ignition oc-

curs. At the same time, the control module sends a sig-

nal to begin an indoor blower 30-second ON-delay.

When the delay ends, the indoor blower motor is ener-

gized on the low fire heating speed and the HUM con-

tacts are energized. The integrated control also initi-

ates a second-stage on delay (factory-set at 7

minutes; adjustable to 12 minutes).

5 - If the heating demand continues beyond the second-

stage on delay, the integrated control energizes the

combustion air inducer at high speed. The control also

checks the high fire (second stage) pressure switch to

make sure it is closed. The high fire (second stage)

gas valve is energized and the indoor blower motor is

energized for operation at the high fire heating speed.

6 - When the thermostat heating demand is satisfied, the

combustion air inducer begins a 5-second low speed

post-purge. The field-selected indoor blower off delay

begins. The indoor blower operates at the low-fire

heating speed.

Flame Sensor

Heat exchanger assembly

Gas manifold

Combustion air inducer

Gas valve

Main burner cluster

Main burner orifices

Pressure switch

Ignitor

Primary limit control

Flame rollout switches

7 - When the combustion air post-purge period is com-

plete, the inducer, the HUM contacts as well as the

120V ACC terminals are de-energized. The indoor

blower is de-energized at the end of the off delay.

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2 - Check for the correct voltage at the furnace (furnace

operating).

Service

3 - Check amp-draw on the blower motor.

Motor Nameplate__________Actual__________

WARNING

ELECTRICAL SHOCK, FIRE,

OR EXPLOSION HAZARD.

Winterizing and Condensate Trap Care

1 - Turn off power to the furnace.

2 - Have a shallow pan ready to empty condensate water.

Failure to follow safety warnings exactly could result

in dangerous operation, serious injury, death or

property damage.

Improper servicing could result in dangerous opera-

tion, serious injury, death, or property damage.

Before servicing, disconnect all electrical power to

furnace.

3 - Remove the clean out cap from the condensate trap

and empty water. Inspect the trap then reinstall the

clean out cap.

Cleaning The Burner Assembly

If cleaning the burner assembly becomes necessary, fol-

low the steps below:

When servicing controls, label all wires prior to dis-

connecting. Take care to reconnect wires correctly.

Verify proper operation after servicing.

1 - Turn off electrical and gas power supplies to furnace.

Remove upper and lower furnace access panels.

2 - Disconnect the wires from the gas valve.

3 - Remove the burner box cover (if equipped).

4 - Disconnect the gas supply line from the gas valve. Re-

move gas valve/manifold assembly.

At the beginning of each heating season, system should be

checked as follows by a qualified service technician:

Blower

5 - Mark and disconnect sensor wire from the sensor. Dis-

connect wires from flame rollout switches.

Check the blower wheel for debris and clean if necessary.

The blower motors are prelubricated for extended bearing

life. No further lubrication is needed.

6 - Disconnect combustion air intake pipe. It may be nec-

essary to cut the existing pipe to remove burner box

assembly.

7 - Remove four screws which secure burner box assem-

bly to vest panel. Remove burner box from the unit.

WARNING

8 - Use the soft brush attachment on a vacuum cleaner to

gently clean the face of the burners. Visually inspect

the inside of the burners and crossovers for any block-

age caused by foreign matter. Remove any blockage.

9 - Reinstall the burner box assembly using the existing

four screws. Make sure that the burners line up in the

center of the burner ports.

The blower access panel must be securely in place

when the blower and burners are operating. Gas

fumes, which could contain carbon monoxide, can

be drawn into living space resulting in personal inju-

ry or death.

Filters

10 - Reconnect the sensor wire and reconnect the 2-pin

plug to the ignitor wiring harness. Reconnect wires to

flame rollout switches.

All air filters are installed external to the unit. Filters should

be inspected monthly. Clean or replace the filters when

necessary to ensure proper furnace operation. Table 1

lists recommended filter sizes.

11 - Reinstall the gas valve manifold assembly. Reconnect

the gas supply line to the gas valve. Reinstall the burn-

er box cover.

Exhaust and air intake pipes

Check the exhaust and air intake pipes and all connections

for tightness and to make sure there is no blockage.

12 - Reconnect wires to gas valve.

13 - Replace the blower compartment access panel.

14 - Refer to instruction on verifying gas and electrical con-

nections when re-establishing supplies.

NOTE - After any heavy snow, ice or frozen fog event the

furnace vent pipes may become restricted. Always check

the vent system and remove any snow or ice that may be

obstructing the plastic intake or exhaust pipes.

15 - Follow lighting instructions to light and operate fur-

nace for 5 minutes to ensure that heat exchanger is

clean and dry and that furnace is operating properly.

Electrical

1 - Check all wiring for loose connections.

16 - Replace heating compartment access panel.

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Start-Up & Performance Check List

UNIT SET UP

(typical)

Furnace:

Model Number_______________

Serial Number_________________

SUPPLY

AIR

Line Voltage

GAS SUPPLY

Natural Gas

LP Propane Gas

Piping Connections Tight

Leak Tested

Flter

RETURN AIR

Supply Line Pressure “W.C.________

Gas Supply Pressure

DUCT SYSTEM

SUPPLY AIR DUCT

Sealed

INTAKE / EXHAUST PIPE

Insulated (if necessary)

All Joints Primed and Glued

RETURN DUCT

Sealed

Terminations Installed Properly

Horizontal Pipes Sloped (if applicable)

Condensate Trap Primed / Line Sloped

Filter Installed and Clean

Grilles Unobstructed

Pipes Supported

VOLTAGE CHECK

Supply Voltage _____

Heat Cable Installed and Operable (if applicable)

Electrical Connections Tight

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UNIT OPERATION

HEATING MODE

COOLING MODE

GAS MANIFOLD PRESSURE “W.C._____

INDOOR BLOWER AMPS______

COMBUSTION SAMPLE CO % CO PPM_______

2 ______

TEMPERATURE DROP

Return Duct Temperature _________

INDOOR BLOWER AMPS______

TEMPERATURE RISE

Supply Duct Temperature _______

Temperature Drop = _________

TOTAL EXTERNAL STATIC (dry coil)

Supply External Static _______

Supply Duct Temperature ________

Return Duct Temperature

_____

Return External Static + ______

Total External Static = _______

Temperature Rise = ________

TOTAL EXTERNAL STATIC

DRAIN LINE

Leak Free

Supply External Static _______

Return External Static + ______

Total External Static = _______

THERMOSTAT

CONDENSATE LINE

Leak Free

Adjusted and Programmed

Explained Operation to Owner

VENT PIPE

Leak Free

Combustion CO

SUPPLY

AIR

Thermostat

Temperatures

Gas Manifold Pressure

Blower Motor Amps

Duct Static

High +

RETURN AIR

Low -

Contractor's: Name_________________________Telephone_____________Checklist Completed____________________

Job Address_____-________________________________Technician's Name___________________________________

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Requirements for Commonwealth of Massachusetts

Modifications to NFPA-54, Chapter 10

4 - INSPECTION. The state or local gas inspector of the

side wall, horizontally vented, gas-fueled equipment

shall not approve the installation unless, upon inspec-

tion, the inspector observes carbon monoxide detec-

tors and signage installed in accordance with the pro-

visions of 248 CMR 5.08(2)(a) 1 through 4.

Revise NFPA-54 section 10.8.3 to add the following re-

quirements:

For all side wall, horizontally vented, gas-fueled equipment

installed in every dwelling, building or structure used in

whole or in part for residential purposes, including those

owned or operated by the Commonwealth and where the

side wall exhaust vent termination is less than seven (7)

feet above the finished grade in the area of the venting, in-

cluding but not limited to decks and porches, the following

requirements shall be satisfied:

EXEMPTIONS: The following equipment is exempt

from 24 CMR 5.08(2)(a) 1 through 4:

1 - The equipment listed in Chapter 10 entitled “Equip-

ment Not Required to Be Vented” in the most current

edition of NFPA 54 as adopted by the Board; and

2 - Product Approved side wall, horizontally vented, gas-

fueled equipment installed in a room or structure sepa-

rate from the dwelling, building or structure used in

whole or in part for residential purposes.

1 - INSTALLATION OF CARBON MONOXIDE DETEC-

TORS. At the time of installation of the side wall, hori-

zontally vented, gas-fueled equipment, the installing

plumber or gasfitter shall observe that a hard-wired

carbon monoxide detector with an alarm and battery

backup is installed on the floor level where the gas

equipment is to be installed. In addition, the installing

plumber or gasfitter shall observe that a battery-oper-

ated or hard-wired carbon monoxide detector with an

alarm is installed on each additional level of the dwell-

ing, building or structure served by the side wall, hori-

zontally vented, gas-fueled equipment. It shall be the

responsibility of the property owner to secure the ser-

vices of qualified licensed professionals for the instal-

lation of hard-wired carbon monoxide detectors.

MANUFACTURER REQUIREMENTS -

GAS EQUIPMENT VENTING SYSTEM PROVIDED.

When the manufacturer of Product Approved side wall,

horizontally vented, gas-fueled equipment provides a vent-

ing system design or venting system components with the

equipment, the instructions provided by the manufacturer

for installation of the equipment and the venting system

shall include:

1 - Detailed instructions for the installation of the venting

system design or the venting system components:

and

a - In the event that the side wall, horizontally vented,

gas-fueled equipment is installed in a crawl space

or an attic, the hard-wired carbon monoxide detec-

tor with alarm and battery back-up may be installed

on the next adjacent floor level.

2 - A complete parts list for the venting system design or

venting system.

MANUFACTURER REQUIREMENTS -

GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED.

b - In the event that the requirements of this subdivi-

sion cannot be met at the time of completion of

installation, the owner shall have a period of thirty

(30) days to comply with the above requirements;

provided, however, that during said thirty (30) day

period, a battery-operated carbon monoxide detec-

tor with an alarm shall be installed.

When the manufacturer of Product Approved side wall,

horizontally vented, gas-fueled equipment does not pro-

vide the parts for venting the flue gases, but identifies “spe-

cial venting systems,” the following requirements shall be

satisfied by the manufacturer:

2 - APPROVED CARBON MONOXIDE DETECTORS.

Each carbon monoxide detector as required in accor-

dance with the above provisions shall comply with

NFPA 720 and be ANSI/UL 2034 listed and IAS certi-

fied.

1 - The referenced “special venting system” instructions

shall be included with the appliance or equipment

installation instructions; and

The “special venting systems” shall be Product Ap-

proved by the Board, and the instructions for that sys-

tem shall include a parts list and detailed installation

instructions.

3 - SIGNAGE. A metal or plastic identification plate shall

be permanently mounted to the exterior of the building

at a minimum height of eight (8) feet above grade di-

rectly in line with the exhaust vent terminal for the hori-

zontally vented, gas-fueled heating appliance or

equipment. The sign shall read, in print size no less

than one-half (1/2) inch in size, “GAS VENT DIRECT-

LY BELOW. KEEP CLEAR OF ALL OBSTRUC-

TIONS.”

A copy of all installation instructions for all Product

Approved side wall, horizontally vented, gas-fueled

equipment, all venting instructions, all parts lists for

venting instructions, and/or all venting design instruc-

tions shall remain with the appliance or equipment at

the completion of the installation.

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