Lennox EL296DFV, ELITE, EL296DFXV045P36B, EL296DFXV110P60C, EL296DFXV070P48B Installation Instructions Manual

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INSTALLATION

 2016 Lennox Industries Inc.

Dallas, Texas, USA

INSTRUCTIONS EL296DFV

ELITE DOWNFLOW AIR DISCHARGE

507048-03 05/2016 Supersedes 507048-02

SERIES GAS FURNACE

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 HVAC in staller (or equivalent), service agency or the gas sup plier.

DOWNFLOW

AIR FLOW

CAUTION

As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.

Table of Contents

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

EL296DFV Gas Furnace 3..............................

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

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

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

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

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

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

Filters 12..............................................

Duct System 12........................................

Pipe and Fittings Specifications 12.......................

Venting Options 13.....................................

Joint Cementing Procedure 16...........................

NOTICE

A thermostat is not included and must be ordered separately.

D The Lennox icomforti

communicating applications.

D In non-communicating applications, the Lennox

ComfortSense well as other non-communicating thermostats.

In all cases, setup is critical to ensure proper sys tem operation.

Field wiring for both communicating and non-com municating applications is illustrated in diagrams, which begin on Page 39.

Venting Practices 16....................................

Vent Piping Guidelines 18...............................

Gas Piping 35.........................................

Electrical 37...........................................

Integrated Control 46...................................

Blower Motor Performance 51...........................

Unit Start Up 55........................................

Gas Pressure Measurement 56..........................

Proper Combustion / High Altitude 57.....................

Heating Sequence of Operation 59.......................

Service 60............................................

Program Unit Capacity Size Mode 62.....................

Repair Parts List 64....................................

7500 thermostat may be used, as

thermostat must be used in

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EL296DFV Unit Dimensions - inches (mm)

COMBUSTION

EXHAUST AIR

AIR INTAKE

OUTLET

2−1/16 (52)

(127)

2−1/4

(57)

9/16

(14)

RETURN AIR

OPENING

9/16

(14)

TOP VIEW

3/4

(19)

AIR

FLOW

Supply

Air

9/16

(14)

3/4

(19)

(838)

1−1/2 (38)

Front Panel

1 (25)

1−7/8 (48)

5−3/16

(132)

2−1/16

(52)

2 (51)

Either Side

GAS PIPING INLET

(Either Side)

9−1/8 (232) Right 6−9/16 (167) Left

27−3/4

(705)

6−1/4 (157)

OPTIONAL LEFT SIDE

ELECTRICAL INLET

(Either Side)

ALTERNATE RIGHT SIDE

VENT LOCATION

(Parts Furnished)

ELECTRICAL INLET

(Either Side)

TRAP CONNECTION

6−7/16 (163)

Either Side

19−7/16

(494)

VENT LOCATION

(Kit Required)

CONDENSATE

(Either Side)

9 (229)

Either Side

(489)

Supply

Air

19−1/4

9/16 (14)

3/4

(19)

FRONT VIEW SIDE VIEW

Model No.

EL296DFXV045P36B EL296DFXV070P48B

EL296DFXV090P60C EL296DFXV110P60C

A B C

in. mm in. mm in. mm

17-1/2 446 16-3/8 416 16 406

21 533 19-7/8 505 19-1/2 495

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EL296DFV Gas Furnace

Shipping and Packing List

The EL296DFV Category IV gas furnace is shipped ready for installation in the downflow position.

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.

The EL296DFV can be installed as a Direct Vent or NonDirect Vent gas central furnace.

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.

DIRECT VENT INSTALLATION NON-DIRECT VENT

EXHAUST OUTLET

AIR INTAKE OUTSIDE

COMBUSTION

OF HOUSE

INSTALLATION

EXHAUST

OUTLET

COMBUSTION

AIR INTAKE

OF HOUSE

INSIDE

FIGURE 1

Package 1 of 1 contains

1 - Assembled EL296DFV unit 1 - Bag assembly containing the following:

1 - Snap bushing 1 - Snap plug 1 - Wire tie 1 - Condensate trap 1 - Condensate trap cap 1 - Condensate trap clamp 1 - 2” diameter Air intake screen 1 - 3/4” Threaded street elbow 2 - 2” Street elbows 2 - Side vent sealing plates 2 - Side vent sealing gaskets 6 - Sheet metal screws

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.

Check equipment for shipping damage. If you find any damage, immediately contact the last carrier.

The following items may also be ordered separately: 1 - Thermostat 1 - LP/Propane changeover kit 1 - High altitude pressure switch

Safety Information

NON-DIRECT VENT

INSTALLATION

EXHAUST OUTLET

COMBUSTION

AIR INTAKE INSIDE

VENTILATED

ATTIC SPACE

FIGURE 2

NON-DIRECT VENT

INSTALLATION

EXHAUST OUTLET

COMBUSTION

AIR INTAKE INSIDE

VENTILATED

CRAWL SPACE

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.

CAUTION

As with any mechanical equipment, personal injury can result from contact with sharp sheet metal edges. Be careful when you handle this equipment.

Use only the type of gas approved for use with this furnace. Refer to unit nameplate.

EL296DFV 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

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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:

American National Standards Institute, Inc. 11 West 42nd Street New York, NY 10036

In Canada, installation must conform with current National Standard of Canada CSA‐B149 Natural Gas and Propane Installation Codes, local plumbing or waste water codes and other applicable local codes.

In order to ensure proper unit operation in non-direct vent applications, combustion and ventilation air supply must be provided according to the current National Fuel Gas Code or CSA‐B149 standard.

Locations and Clearances

This furnace is CSA International certified for installation clearances to combustible material as listed on the unit nameplate and in the table in figure 13. Accessibility and ser vice clearances must take precedence over fire protection clearances.

For installation in a residential garage, the furnace must be installed so that the burner(s) and the ignition source are located no less than 18 inches (457 mm) above the floor. The furnace must be located or protected to avoid physical damage by vehicles. When a furnace is installed in a public garage, hangar, or other building that has a 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.

NOTE - Furnace must be adjusted to obtain a temperature rise within the range specified on the unit nameplate. Failure to do so may cause erratic limit operation and premature heat exchanger failure.

This EL296DFV furnace must be installed so that its electri cal components are protected from water.

Installation in Combination with a Cooling Coil

When this furnace is used with cooling units (figure 3), it shall be installed in parallel with, or on the upstream side of, cooling units to avoid condensation in the heating compart ment. 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 manu ally operated, it must be equipped to prevent operation of ei ther the heating or the cooling unit, unless it is in the full HEAT or COOL setting.

When installed, this furnace must be electrically grounded according to local codes. In addition, in the United States, installation must conform with the current National Electric Code, ANSI/NFPA No. 70. The National Electric Code (ANSI/NFPA No. 70) is available from the following ad dress:

National Fire Protection Association 1 Battery March Park Quincy, MA 02269

In Canada, all electrical wiring and grounding for the unit must be installed according to the current regulations of the Canadian Electrical Code Part I (CSA Standard C22.1) and/or local codes.

Heating Unit Installed Parallell to Air Handler Unit

GAS UNIT

Dampers

(open during heating

operation only)

AIR HANDLER

Dampers

(open during cooling

operation only)

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.

The EL296DFV furnace may be installed in alcoves, clos ets, attics, basements, garages, utility rooms and crawl spaces.

This furnace design has not been CSA certified for installa tion in mobile homes, recreational vehicles, or outdoors.

Never use an open flame to test for gas leaks. Check all connections using a commercially available soap solution made specifically for leak detection.

Use of Furnace as Construction Heater

Lennox does not recommend the use of EL296DFV 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.

EL296DFV units may be used for heating of buildings or structures under construction, if the following conditions are met:

• The vent system must be permanently installed per these installation instructions.

• A room thermostat must control the furnace. The use of fixed jumpers that will provide continuous heating is not allowed.

• The return air duct must be provided and sealed to the furnace.

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• Return air temperature range between 60°F (16°C) and 80°F (27°C) must be maintained.

• Air filters must be installed in the system and must be maintained during construction.

• Air filters must be replaced upon construction comple tion.

• The input rate and temperature rise must be set per the furnace rating plate.

• 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 furnace heat exchanger, components, duct system, air filters and evaporator coils must be thoroughly cleaned following final construction clean-up.

• All furnace operating conditions (including ignition, in put rate, temperature rise and venting) must be verified according to these installation instructions.

General

These instructions are intended as a general guide and do not supersede local codes in any way. Consult authorities having jurisdiction before installation.

In addition to the requirements outlined previously, the fol lowing general recommendations must be considered when installing a EL296DFV 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 chimney or 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.

• 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.

• When the furnace is installed in an attic or other insu lated space, keep insulation away from the furnace.

• When the furnace is installed in an unconditioned space, consider provisions required to prevent freezing of condensate drain system.

CAUTION

EL296DFV unit should not be installed in areas nor mally subject to freezing temperatures.

WARNING

This product contains a chemical known to the State of California to cause cancer, birth defects, or other reproductive harm.

Combustion, Dilution & Ventilation Air

If the EL296DFV is installed as a Non-Direct Vent Fur nace, follow the guidelines in this section.

NOTE - In Non-Direct Vent installations, combustion air is taken from indoors or ventilated attic or crawlspace and flue gases are discharged out-doors.

WARNING

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:

Permanent wave solutions Chlorinated waxes and cleaners Chlorine base swimming pool chemicals Water softening chemicals De-icing salts or chemicals Carbon tetrachloride Halogen type refrigerants Cleaning solvents (such as perchloroethylene) Printing inks, paint removers, varnishes, etc. Hydrochloric acid Cements and glues Antistatic fabric softeners for clothes dryers Masonry acid washing materials

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.

In the absence of local codes concerning air for combustion and ventilation, use the guidelines and procedures in this section to install EL296DFV furnaces to ensure effi cient and safe operation. You must consider combustion air needs and requirements for exhaust vents and gas pip-ing. A portion of this information has been reprinted with permission from the National Fuel Gas Code (ANSI-

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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.

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.

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.

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.

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 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.

Confined Space

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

) per 1,000 Btu (.29 kW) per hour of the com

feet (1.42 m

) per 1,000 Btu (.29 kW) per hour of the combined 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 air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace. This is especially important when the furnace is mounted on a platform in a 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.

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 (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

ROOF TERMINATED

EXHAUST PIPE

OPENINGS

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

NOTE - Each opening shall have a free area of at least one square inch per 1,000 Btu (645mm rating of all equipment in the enclosure, but not less than 100 square inches (64516mm.

per .29kW) per hour of the total input

2).

(To Adjacent

Unconfined

Space)

FIGURE 4

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Air from 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 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. When communicating with the outdoors through horizontal ducts, each opening shall have a mini mum free area of 1 square inch per 2,000 Btu (645mm per .59kW) per total input rating of all equipment in the en closure (See figure 5). It is also permissible to bring in air for combustion from a ventilated attic (figure 6) or venti lated crawl space (figure 7).

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE

(Inlet Air from Crawl Space and Outlet Air to Ventilated Attic)

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

Roof Terminated

Exhaust Pipe

Ventilation

Louvers

(Crawl space)

EQUIPMENT IN CONFINED SPACE

Furnace

Coupling or 3 in. to 2 in.

Transition

(Field Provided)

*Intake Debris Screen Provided)

Inlet Air

(Minimum

12 in.(305mm)

Above crawl

space floor)

VENTILATION LOUVERS

OUTLET

AIR

(Each end of attic)

VENTILATION

LOUVERS

(For unheated

crawl space)

per 1.17kW) per

ROOF TERMINATED

EXHAUST PIPE

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm hour of the total input rating of all equipment in the enclosure.

INLET

AIR

FIGURE 5

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

Roof Terminated

Exhaust Pipe

EQUIPMENT IN CONFINED SPACE

Ventilation Louvers

Inlet Air

(Minimum

12 in.(305mm) Above

attic floor)

*Intake Debris

Screen

(Provided)

Furnace

* See table 9 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 hour of the total input rating of all equipment in the enclosure.

per 1.17kW) per

FIGURE 6

* See table 9 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 hour of the total input rating of all equipment in the enclosure.

per 1.17kW) per

FIGURE 7

If air from outside is brought in for combustion and ventila tion, the confined space must have two permanent open ings. One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12 inches (305 mm) of the bottom. These openings must communi cate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indi rectly through vertical ducts. Each opening shall have a

minimum free area of 1 square inch (645 mm

) per 4,000 Btu (1.17 kW) per hour of total input rating of all equipment in the enclosure. See figures 5 and 8. When communicat ing with the outdoors through horizontal ducts, each open ing shall have a minimum free area of 1 square inch (645

) per 2,000 Btu (.56 kW) per total input rating of all

mm equipment in the enclosure. See figure 9.

When ducts are used, they shall be of the same cross-sec tional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be no less than 3 inches (75 mm). In calculating free 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.

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EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE

(All Air Through Ventilated Attic)

EL296 Furnaces with

1/2 HP Blower Motor

ROOF TERMINATED

EXHAUST PIPE

OUTLET

AIR

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm hour of the total input rating of all equipment in the enclosure.

VENTILATION LOUVERS

(Each end of attic)

INLET AIR

(Ends 12” above

bottom)

per 1.17kW) per

FIGURE 8

EQUIPMENT IN CONFINED SPACE -

ALL AIR FROM OUTSIDE

ROOF TERMINATED

EXHAUST PIPE

OUTLET AIR

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

NOTE-Each air duct opening shall have a free area of at least one square inch per 2,000 Btu (645mm 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 hour of the total input rating of all other equipment in the enclosure.

per .59kW) per hour of the total

INLET AIR

per 1.17kW) per

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.

RIGID LEG

(Remove shipping bolt

and washer)

FIGURE 10

Installation - Setting Equipment

WARNING

Do not install the furnace on its front, back or in the horizontal position. See figure 12. Do not connect the return air ducts to the back of the furnace. Doing so will adversely affect the operation of the safety con trol devices, which could result in personal injury or death.

Select a location that allows for the required clearances that are listed on the unit nameplate. Also consider gas supply connections, electrical supply, vent connection, condensate trap and drain connections, and installation and service clearances [24 inches (610 mm) at unit front]. The unit must be level from side to side. Unit may

be positioned from level to 1/2” toward the front to aid in draining. See figure 11.

Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or al cove installations are shown in figure 13.

WARNING

Blower access panel must be securely in place when blower and burners are operating. Gas fumes, which could contain carbon monoxide, can be drawn into living space resulting in personal injury or death.

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SETTING EQUIPMENT

AIR FLOW

FRONT VIEW

AIR FLOW

UNIT

FRONT

SIDE VIEW

UNIT

FRONT

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

AIR FLOW

SIDE VIEW

1/2”

max.

Back

Front

NOTE - Do not install the furnace on its front, back or in the horizontal position

FIGURE 12

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Horizontal

Page 10

WARNING

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. 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.

The unit may be installed three ways in downflow applica tions: on non-combustible flooring, on combustible flooring using an additive base, or on a reverse-flow cooling coil cabinet. Do not drag the unit across the floor in the

downflow position. Floor and furnace flange damage will result. Refer to figure 13 for clearances in downflow applica

tions.

Installation on Non-Combustible Flooring Figure 14

1 - Cut floor opening keeping in mind clearances listed on

unit rating plate. Also keep in mind gas supply connec tions, electrical supply, flue and air intake connections and sufficient installation and servicing clearances. See table 1 for correct floor opening size.

2 - Flange warm air plenum and lower the plenum into the

opening.

3 - Set the unit over the plenum and seal the plenum to

the unit.

4 - Ensure that the seal is adequate.

TABLE 1

NON-COMBUSTIBLE FLOOR OPENING SIZE

Cabinet Width

B Cabinet (17.5”) 19 - 3/4 502 16 - 5/8 422

C Cabinet (21”) 19 - 3/4 502 20-1/8 511

NOTE - Floor opening dimensions listed are 1/4 inch (6 mm) larger than the unit opening. See dimension drawing on page 2.

Front to Rear Side to Side

in. mm in. mm

Downflow Application Installation Clearances

Top

Left Side Right Side

Bottom

Top 0

*Front 0

Back 0

Sides 0†

Vent 0

Floor NC‡

*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. †Allow proper clearances to accommodate condensate trap and vent pipe installation. ‡The furnace may be installed on a combustible wood floor if an op tional additive base is installed between the furnace and the com bustible floor.

FIGURE 13

FURNACE

PROPERLY

SIZED FLOOR

OPENING

SUPPLY AIR

PLENUM

FIGURE 14

Installation on Combustible Flooring Figure 15

1 - When unit is installed on a combustible floor, a down

flow combustible flooring base must be installed be tween the furnace and the floor. The base must be or dered separately. See table 2 for opening size to cut in floor.

CAUTION

The furnace and combustible flooring base shall not be installed directly on carpeting, tile, or other com bustible material other than wood flooring.

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TABLE 2

COMBUSTIBLE FLOORING BASE OPENING SIZE

Cabinet

Width

Catalog Number

Front to Rear Side to Side

in. mm in. mm

FURNACE

B Cabinet

(17.5”)

C Cabinet

(21”)

FURNACE

PROPERLY

SIZED FLOOR

OPENING

11M60

11M61

22 559 18 - 3/4 476

22 559 22 - 3/4 578

SUPPLY AIR

PLENUM

COMBUSTIBLE FLOORING BASE

FIGURE 15

2 - After opening is cut, set the combustible flooring base

into opening.

3 - Check fiberglass strips on the combustible flooring

base to make sure they are properly glued and posi tioned.

4 - Lower supply air plenum into the combustible flooring

base until plenum flanges seal against fiberglass strips.

NOTE - Be careful not to damage fiberglass strips. Check for a tight seal.

5 - Set the furnace over the plenum.

6 - Ensure that the seal between the furnace and plenum

is adequate.

Installation on Cooling Coil Cabinet Figure 16

NOTE - Downflow combustible flooring kit is not used.

1 - Refer to reverse-flow coil installation instructions for

correctly sized opening in floor and installation of cabi net.

2 - When cooling cabinet is in place, set and secure the

furnace according to the instructions that are provided with the cooling coil. Secure the furnace to the cabinet.

3 - Seal the cabinet and check for air leaks.

COOLING COIL

PROPERLY

SIZED FLOOR

OPENING

PLENUM

FIGURE 16

Return Air Opening -- Downflow Units

Return air may be brought in only through the top opening of a furnace installed in the downflow position. The follow ing steps should be taken when installing plenum:

1 - Bottom edge of plenum should be flanged with a

hemmed edge (See figure 17 or 18).

2 - Sealing strips should be used to ensure an airtight seal

between the cabinet and the plenum.

3 - In all cases, plenum should be secured to top of fur

nace using sheet metal screws.

4 - Make certain that an adequate seal is made.

PLENUM

(Field Provided)

SEALING STRIP

(Field Provided)

SECURE FROM

OUTSIDE CABINET

CABINET

SIDE PANEL

Side View

FIGURE 17

PLENUM

(Field Provided)

SECURE FROM

INSIDE CABINET

Side View

SEALING STRIP (Field Provided)

CABINET

SIDE PANEL

FIGURE 18

Page 11

Page 12

Filters

This unit is not equipped with a filter or rack. A field-pro vided filter is required for the unit to operate properly. Table 3 lists recommended minimum filter size. 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.

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).

TABLE 3

Furnace

Cabinet Width

17-1/2”

21”

Duct System

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.

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.

Minimum Filter Size

16 x 25 x 1 (1)

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 into the supply air duct system.

Return Air Plenum

NOTE - Return air must not be drawn from a room where this furnace, or any other gas-fueled appliance (i.e., water heater), or carbon monoxide-producing de vice (i.e., wood fireplace) is installed.

When return air is drawn from a room, a negative pres sure is created in the room. If a gas appliance is operating in a room with negative pressure, the flue products can be pulled back down the vent pipe and into the room. This re verse 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.

Use fiberglass sealing strips, caulking, or equivalent seal ing method between the plenum and the furnace cabinet to ensure a tight seal. If a filter is installed, size the return air duct to fit the filter frame.

Pipe & Fittings Specifications

All pipe, fittings, primer and solvent cement must conform with American National Standard Institute and the 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 4 below for approved piping and fitting ma terials.

Page 12

Page 13

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.

TABLE 4

PIPING AND FITTINGS SPECIFICATIONS

Schedule 40 PVC (Pipe) D1785 Schedule 40 PVC (Cellular Core Pipe) F891

Schedule 40 PVC (Fittings) D2466

Schedule 40 CPVC (Pipe) F441

Schedule 40 CPVC (Fittings) F438

SDR-21 PVC or SDR-26 PVC (Pipe) D2241

SDR-21 CPVC or SDR-26 CPVC (Pipe) F442

Schedule 40 ABS Cellular Core DWV (Pipe) F628

Schedule 40 ABS (Pipe) D1527

Schedule 40 ABS (Fittings) D2468

ABS-DWV (Drain Waste & Vent) (Pipe & Fittings)

PVC-DWV (Drain Waste & Vent) Pipe & Fittings)

PRIMER & SOLVENT CEMENT

PVC & CPVC Primer F656 PVC Solvent Cement D2564

CPVC Solvent Cement F493

ABS Solvent Cement D2235

PVC/CPVC/ABS All Purpose Cement For Fittings & Pipe of the same material

ABS to PVC or CPVC Transition Solvent Cement

CANADA PIPE & FITTING & SOLVENT

CEMENT

PVC & CPVC Pipe and Fittings PVC & CPVC Solvent Cement

ABS to PVC or CPVC Transition Cement

POLYPROPYLENE VENTING SYSTEM ULC-S636 PolyPro® by Duravent ULC-S636 InnoFlue® by Centrotherm ULC-S636

D2661

D2665

ASTM

SPECIFICATION

D2564, D2235, F493

D3138

MARKING

ULCS636

IMPORTANT

EL296DFV exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when using PVC vent pipe. When using ABS vent pipe, use transitional solvent cement to make connections to the PVC fittings in the unit.

Use PVC primer and solvent cement or ABS solvent cement meeting ASTM specifications, refer to Table 4. 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.

Low temperature solvent cement is recommended during cooler weather. Metal or plastic strapping may be used for vent pipe hangers. Uniformly apply a liberal coat of PVC primer for PVC or use a clean dry cloth for ABS to clean in side socket surface of fitting and male end of pipe to depth of fitting socket.

Canadian Applications Only - Pipe, fittings, primer and solvent cement used to vent (exhaust) this 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.

Venting Options

The EL296DFV is shipped with vent exhaust / air intake connection at the top cap. See figure 19. Using parts pro vided, the furnace may be field modified to have these connections on the right side of the furnace cabinet. See figure 21 and follow the steps below. For left side venting order kit 87W73.

1 - Remove inner blower door.

2 - Loosen hose clamps which attach rubber fittings to the

white PVC pipes inside the vestibule area. See figure

19.

3 - Loosen the clamp which secures the pipes at the blow

er deck. See figure 19.

4 - Remove white PVC pipes, slide up and out thru the top

cap.

5 - Remove the black plastic fitting in top cap which pre

viously aligned the PVC pipes.

6 - Remove the remaining parts of the pipe clamp at the

blower deck.

7 - Remove the sheet metal patch plate on the side of the

cabinet which covers the openings for side venting op tion. Save screws for reuse.

8 - Re-use the patch plate to cover the hole in the top cap.

See figure 20. Remove the 2 screws which secure the top cap to the furnace on the right side and re-install securing the right edge of the patch plate and the right side of the top cap to the furnace. Use 2 self-drilling sheet metal screws (provided) to finish securing the left edge of the patch plate on the left side.

9 - Use a utility knife to cut out the cabinet insulation for

the right side vent / air intake.

10 -Install the two 90° street elbows (provided) through the

side of the cabinet. The male side of each elbow should extend down through the blower deck and con nect to the rubber fittings below. Once the elbows are properly positioned, tighten each clamp.

11 -Peel protective backing from side vent sealing gaskets

(2) and apply to side vent sealing plates (2) as shown in figure 21.

Page 13

Page 14

12 -Install the side vent sealing plates and gaskets on the

exterior of the cabinet as shown in figure 21. Secure with six mounting screws (four reused and two pro vided from bag assembly). Holes are pre-punched in the parts and cabinet, no drilling is required.

13 -Install sheet metal screws (provided) to seal extra two

holes in cabinet not used with side vent clamps.

IMPORTANT

Side vent sealing plates and side vent sealing gas kets must be used when converting to right side venting. Failure to use gaskets and plates may lead to improper operation of unit.

Top Vent Configuration

Exhaust/Air

Intake Connections

Pipe Clamp

Patch Plate Top Cap

Sheet Metal

Patch Plate

FIGURE 20

FIGURE 19

Hose Clamp

Page 14

Page 15

Right Side Vent Configuration

Side Vent

Sealing Plate

Side Vent

Sealing Gaskets

Input Size

045

070

090

110

Exhaust

Street Elbows (2)

FIGURE 21

TABLE 5

OUTDOOR TERMINATION USAGE*

STANDARD CONCENTRIC

Flush

Vent Pipe

Dia. in.

Mount

Kit

51W11

(US)

51W12

2 inch 3 inch 2 inch

22G44 (US)

30G28 (CA)

(CA)

2-1/2

YES YES

YES YES YES

2 YES YES YES

2-1/2 YES YES

3 YES YES

Wall Kit Wall Ring Kit

44J40

(US)

81J20 (CA)

YES

15F74

YES

Intake

1-1/2 inch 2 inch 3 inch

Field

Fabricated

YES

YES YES YES

71M80

(US)

44W92

(CA)

YES

69M29

(US)

44W92

(CA)

60L46 (US)

44W93 (CA)

NOTE - Standard Terminations do not include any vent pipe or elbows external to the structure. Any vent pipe or elbows external to the structure must be included in total vent length calculations. See vent length tables.

* Kits must be properly installed according to kit instructions.

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 kits 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, 4493 and 81J20 are certified to ULC S636 for use in Canada only.

See table 10 for vent accelerator requirements.

Page 15

Page 16

Joint Cementing Procedure

Venting Practices

All cementing of joints should be done according to the specifications outlined in ASTM D 2855.

NOTE - A sheet metal screw may be used to secure the intake pipe to the connector, if desired. Use a drill or self tapping screw to make a pilot hole.

DANGER

DANGER OF EXPLOSION!

Fumes from PVC glue may ignite during system check. Allow fumes to dissipate for at least 5 minutes before placing unit into operation.

1 - Measure and cut vent pipe to desired length.

2 - Debur and chamfer end of pipe, removing any ridges

or rough edges. If end is not chamfered, edge of pipe may remove cement from fitting socket and result in a leaking joint.

NOTE - Check the inside of vent pipe thoroughly for any obstruction that may alter furnace operation.

3 - Clean and dry surfaces to be joined.

4 - Test fit joint and mark depth of fitting on outside of pipe.

5 - Uniformly apply a liberal coat of PVC primer for PVC or

use a clean dry cloth for ABS to clean inside socket surface of fitting and male end of pipe to depth of fitting socket.

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

NOTE - Time is critical at this stage. Do not allow prim er to dry before applying cement.

7 - Immediately after applying last coat of cement to pipe,

and while both inside socket surface and end of pipe are wet with cement, forcefully insert end of pipe into socket until it bottoms out. Turn PVC pipe 1/4 turn dur ing assembly (but not after pipe is fully inserted) to dis tribute cement evenly. DO NOT turn ABS or cellular core pipe.

NOTE - Assembly should be completed within 20 sec onds after last application of cement. Hammer blows should not be used when inserting pipe.

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

of fitting socket. A properly made joint will show a bead around its entire perimeter. Any gaps may indi cate an improper assembly due to insufficient sol vent.

9 - Handle joints carefully until completely set.

Piping Suspension Guidelines

SCHEDULE 40

PVC - 5'

all other pipe* - 3'

* See table 4 for allowable pipe.

NOTE - Isolate piping at the point where it exits the outside wall or roof in order to prevent transmission of vibration to the structure.

Wall Thickness Guidelines

24” maximum 3/4” minimum

inside outside

Wall

FIGURE 22

REPLACING FURNACE THAT

CHIMNEY

OR GAS

VENT

(Check sizing

for water

heater only)

FURNACE

(Replaced by EL193)

If an EL296DFV furnace replaces a furnace which was commonly vented with another gas appliance, the size of the existing vent pipe for that gas appliance must be checked. Without the heat of the original furnace flue prod ucts, 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.

WAS PART OF A COMMON

VENT SYSTEM

WATER

HEATER

OPENINGS

(To Adjacent

Room)

FIGURE 23

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.

Page 16

Page 17

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.

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.

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.

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:

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

tem.

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.

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.

4 - Follow the lighting instructions. Turn on the appliance

that is being inspected. Adjust the thermostat so that the appliance operates continuously.

5 - After the 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.

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.

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.

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.

Exhaust Piping (Figures 25 and 26)

Route piping to outside of structure. Continue with installa tion following instructions given in piping termination sec tion.

WARNING

Carbon Monoxide Poisoning Hazard

Cutting or altering exhaust or air intake pipes, which are located in the blower compartment, could result in Carbon Monoxide Poisoning or Death.

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.

CAUTION

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.

Page 17

Page 18

Vent Piping Guidelines

NOTE - Lennox has approved the use of DuraVent Centrotherm manufactured vent pipe and terminations as an option to PVC. When using the PolyPro InnoFlue

by Centrotherm venting system the vent pipe re

by DuraVent or

quirements stated in the unit installation instruction – min imum & maximum vent lengths, termination clearances, etc. – apply and must be followed. Follow the instructions provided with PoyPro by DuraVent and InnoFlue by Cen trotherm venting system for assembly or if requirements are more restrictive. The PolyPro by Duravent and In noFlue by Centrotherm venting system must also follow the uninsulated and unconditioned space criteria listed in table 8.

The EL296DFV can be installed as either a Non-Direct Vent or a Direct Vent gas central furnace.

NOTE - In Non‐Direct Vent installations, combustion air is taken from indoors 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 6 and 7. Count all elbows inside and outside the home. Table 6 lists the minimum vent pipe lengths per mitted. Table 7 lists the maximum pipe lengths permitted.

TABLE 6

MINIMUM VENT PIPE LENGTHS

EL296DFV

MODEL

045, 070, 090, 110

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

MIN. VENT LENGTH*

15 ft. or

5 ft plus 2 elbows or

10 ft plus 1 elbow

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 10.

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.

and

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.

NOTE - If right side venting option is used, you must include the elbow at the furnace in the elbow count. If transitioning to 3” dia pipe, this elbow equates to 20' of equivalent vent length for all models.

Use the following steps to correctly size vent pipe diameter.

Piping Size Process

What is the

furnace capacity?

045, 070, 090,

110 or 135?

Which style termination

being used?

Standard or concentric?

See table 5.

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?

IMPORTANT

Do not use screens or perforated metal in exhaust or intake terminations. Doing so will cause freeze-ups and may block the terminations.

NOTE - It is acceptable to use any pipe size which fits within the guidelines allowed in table 7.

NOTE toward unit. A minimum of 1/4” (6mm) drop for each 12” (305mm) of horizontal run is mandatory for drainage.

All horizontal runs of exhaust pipe must slope back

Page 18

Use table 7 or 9 to find max intake or exhaust pipe

length. Includes all vent pipe and elbows inside and outside the house.

FIGURE 24

Page 19

Maximum Allowable Intake or Exhaust Vent Length

TABLE 7

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 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

Number Of 90° Elbows

Used

1 71 56 34 14 105 105 83 48 128 127 108 108 2 66 51 29 9 100 100 78 43 123 122 103 103 3 61 46 24 4 95 95 73 38 118 117 98 98 4 56 41 19 n/a 90 90 68 33 11 3 11 2 93 93 5 51 36 14 n/a 85 85 63 28 108 107 88 88 6 46 31 9 n/a 80 80 58 23 101 102 83 83 7 41 26 4 n/a 75 75 53 18 98 97 78 78 8 36 21 n/a n/a 70 70 48 13 93 92 73 73 9 31 16 n/a n/a 65 65 43 8 88 87 68 68

10 26 11 n/a n/a 60 60 38 3 83 82 63 63

Number Of 90° Elbows

Used

1 71 56 34 n/a 105 105 83 48 128 127 108 108 2 66 51 29 n/a 100 100 78 43 123 122 103 103 3 61 46 24 n/a 95 95 73 38 11 8 11 7 98 98 4 56 41 19 n/a 90 90 68 33 11 3 11 2 93 93 5 51 36 14 n/a 85 85 63 28 108 107 88 88 6 46 31 9 n/a 80 80 58 23 103 102 83 83 7 41 26 4 n/a 75 75 53 18 98 97 78 78 8 36 21 n/a n/a 70 70 48 13 93 92 73 73 9 31 16 n/a n/a 65 65 43 8 88 87 68 68

10 26 11 n/a n/a 60 60 38 3 83 82 63 63

045 070 090 110 045 070 090 110 045 070 090 110

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

Standard Termination Elevation 4500 - 10,000 ft

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

Concentric Termination at Elevation 0 - 4500 ft

Number Of 90°

Elbows Used

1 63 48 32 12 95 95 79 44 111 111 104 104 2 58 43 27 7 90 90 74 39 106 106 99 99 3 53 38 22 2 85 85 69 34 101 91 94 94 4 48 33 17 5 43 28 12 75 75 59 24 91 91 84 84 6 38 23 7 70 70 54 19 96 86 79 79 7 33 18 2 65 65 49 14 81 81 74 74 8 28 13 9 23 8 55 55 39 4 71 71 64 64

10 18 3 50 50 34 n/a 66 66 59 59

Number Of 90°

Elbows Used

1 63 48 32 2 58 43 27 90 90 74 39 106 106 99 99 3 53 38 22 85 85 69 34 101 101 94 94 4 48 33 17 80 80 64 29 96 96 89 89 5 43 28 12 75 75 59 24 91 91 84 84 6 38 23 7 70 70 54 19 86 86 79 79 7 33 18 2 65 65 49 14 81 81 74 74 8 28 13 9 23 8 55 55 39 4 71 71 64 64

10 18 3 50 50 34 n/a 66 66 59 59

045 070 090 110 045 070 090 110 045 070 090 110

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

80 80 64 29 96 96 89 89

n/a

60 60 44 9 76 76 69 69

n/a

Concentric Termination Elevation 4501 - 10,000 ft

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

95 95 79 44 111 111 104 94

n/a

60 60 44 9 76 76 69 69

n/a

Page 19

Page 20

TYPICAL EXHAUST PIPE CONNECTIONS

Pipe size determined in table 7.

*2”

2”

DO NOT transition from smaller

2”

3”

TRANSITION

to larger pipe size in horizontal

runs of exhaust pipe.

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

NOTE − Exhaust pipe and intake pipe must be the same diameter.

FIGURE 25

INTAKE

EXHAUST

TOP VIEW

Pipe size determined in table 7.

TYPICAL INTAKE PIPE CONNECTIONS

2”

TRANSITION

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

NOTE − Intake pipe and exhaust pipe must be the same diameter.

2”

3”

*2”

2”

*2”

2”

TRANSITION

*2”

2”

3”

INTAKE

FIGURE 26

EXHAUST

TOP VIEW

Page 20

Page 21

TYPICAL EXHAUST CONNECTIONS WITH RIGHT SIDE VENT OPTION

Pipe Length 4” Maximum

2”

Street Ell

(Not Furnished)

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

(Not Furnished)

2”

NOTE Intake pipe and exhaust pipe must be the same diameter.

2”

TRANSITION

”

*2”

FIGURE 27

TYPICAL AIR INTAKE PIPE CONNECTIONS WITH RIGHT SIDE VENT OPTION

Plate

(Furnished)

TOP VIEW

2”

*2”

Street Ell

(Not Furnished)

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

NOTE Intake pipe and exhaust pipe must be the same diameter.

2”

TRANSITION

”

*2”

(Furnished)

FIGURE 28

Plate

TOP VIEW

Page 21

Page 22

Intake Piping

The EL296DFV 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. Guidelines listed in Combustion, Dilution and Ventilation Air section must be followed.

Follow the next two steps when installing the unit in Direct Vent applications, where combustion air is taken from outdoors and flue gases are discharged outdoors. The

provided air intake screen must not be used in direct vent applications (outdoors).

1 - Use cement or a sheet metal screw to secure the in

take pipe to the inlet air connector.

2 - If intake air is drawn from a ventilated crawlspace (fig

ure 30) or ventilated attic (figure 29) the exhaust vent length must not exceed those listed in table 9. If 3” di ameter pipe is used, reduce to 2” diameter pipe to ac commodate the debris screen.

3 - Route piping to outside of structure. Continue with

installation following instructions given in general guide lines for piping terminations and intake and ex haust piping terminations for direct vent sections. Re fer to table

7 for pipe sizes.

CAUTION

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.

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

Roof Terminated

Exhaust Pipe

Ventilation

Louvers

(Crawl space)

(Field Provided)

EQUIPMENT IN CONFINED SPACE

Furnace

Coupling or 3 in. to 2 in.

Transition

12 in.(305mm)

*Intake Debris Screen Provided)

Inlet Air

(Minimum

Above crawl

space floor)

* See table 9 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 hour of the total input rating of all equipment in the enclosure.

per 1.17kW) per

FIGURE 29

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

Roof Terminated

Exhaust Pipe

EQUIPMENT IN CONFINED SPACE

Ventilation Louvers

Inlet Air

(Minimum

12 in.(305mm) Above

attic floor)

*Intake Debris

Screen

(Provided)

Furnace

Page 22

* See table 9 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 hour of the total input rating of all equipment in the enclosure.

per 1.17kW) per

FIGURE 30

Page 23

TYPICAL AIR INTAKE PIPE CONNECTIONS

NON−DIRECT VENT APPLICATIONS

AIR

INTAKE

SCREEN

(Provided)

NOTE - Air intake screen and elbow may be rotated, so that screen may be positioned to face forward or to either side.

FIGURE 31 Follow the next two steps when installing the unit in Non‐ Direct Vent applications where combustion air is taken from indoors and flue gases are discharged outdoors.

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

air intake screen to route the intake piping as shown in figure 31. 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 sideways.

2 - Use cement to secure the intake pipe to the connector,

if desired.

General Guidelines for Vent Terminations

In Non‐Direct Vent applications, combustion air is taken from indoors and the flue gases are discharged to the out doors. The EL296DFV is then classified as a non‐direct vent, Category IV gas furnace.

In Direct Vent applications, combustion air is taken from outdoors and the flue gases are discharged to the out doors. The EL296DFV 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.

Position termination according to location given in figure 33 or 34. In addition, position termination so it is free from any obstructions and 12” above the average snow accumula tion.

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 an outdoor AC unit because the condensate can damage the painted coating.

NOTE - See table 8 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 must be protected from deterioration. Armaflex with UV protection is permissable. Basements or other en closed areas that are not exposed to the outdoor ambient temperature and are above 32 degrees F (0°C) are to be considered conditioned spaces.

IMPORTANT

Do not use screens or perforated metal in exhaust terminations. Doing so will cause freeze-ups and may block the terminations.

IMPORTANT

For Canadian Installations Only: In accordance to CSA International B149 installation codes, the minimum allowed distance between the combustion air intake inlet and the exhaust outlet of other appliances shall not be less than 12 inches (305mm).

Page 23

Page 24

Maximum Allowable Exhaust Vent Pipe Length (in ft.) Without Insulation In Unconditioned Space For

TABLE 8

Winter Design Temperatures Two - Stage High Efficiency Furnace

Winter Design

Temperatures

32 to 21

(0 to -6)

°F (°C)

Vent Pipe

Diameter

045 070 090 110

PVC

PP PVC

2 in. 21 18 33 30 46 42 30 30

2-1/2 in. 16 N/A 26 N/A 37 N/A 36 N/A

Unit Input Size

PP PVC

3 in. 12 12 21 21 30 30 29 29

2 in 11 9 19 17 28 25 27 24

20 to 1

(-7 to -17)

2-1/2 in. 7 N/A 14 N/A 21 N/A 20 N/A

3 in. N/A N/A 9 9 16 16 14 14

2 in. 6 4 12 10 19 16 18 15

0 to -20

(-18 to -29)

2-1/2 in. N/A N/A 7 N/A 13 N/A 12 N/A

3 in. N/A N/A N/A N/A 8 8 7 7

1Refer to 99% Minimum Design Temperature table provided in the current edition of the ASHRAE Fundamentals Handbook.

Poly-Propylene vent pipe (PP) by Duravent and Centrotherm.

NOTE - Concentric terminations are the equivalent of 5' and should be considered when measuring pipe length. 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 7 or 9 which ever is less. NOTE - If insulation is required in an unconditioned space, it must be located on the pipe closest to the furnace. See figure32.

Conditioned

Space

Conditioned

Space

FIGURE 32

Pipe Insulation

Unconditioned

Space

Exhaust

Pipe

Intake

Pipe

Page 24

Page 25

Maximum Allowable Exhaust Vent Length Using Ventilated Attic or Crawl Space For Intake Air in Feet

TABLE 9

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 - 10,000 ft

Number Of

90° El

bows Used

045 070 090 110 045 070 090 110 045 070 090 110

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

1 61 46 24 4 90 90 68 33 108 107 88 88 2 56 41 19

85 85 63 28 103 102 83 83 3 51 36 14 80 80 58 23 98 97 78 78 4 46 31 9 75 75 53 18 93 92 73 73 5 41 26 4 70 70 48 13 88 87 68 68 6 36 21

n/a

65 65 43 8 81 82 63 63 7 31 16 60 60 38 3 78 77 58 58 8 26 11 55 55 33 n/a 73 72 53 53

n/a

9 21 6 50 50 28 n/a 68 67 48 48

10 16 1 45 45 23 n/a 63 62 43 43

Page 25

Page 26

VENT TERMINATION CLEARANCES

FOR NON-DIRECT VENT INSTALLATIONS IN THE USA AND CANADA

INSIDE CORNER

DETAIL

Fixed

Closed

Operable

VENT TERMINAL

AIR SUPPLY INLET

US Installations

A =

Clearance above grade, veranda,

porch, deck or balcony

B =

Clearance to window or

door that may be opened

C =

Clearance to permanently

closed window

Vertical clearance to ventilated soffit

D =

located above the terminal within a

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

above average snow accumulation.

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

1 foot (30cm) above opening

* 12”

* Equal to or greater than soffit depth.

horizontal distance of 2 feet (610 mm)

from the center line of the terminal

E =

F =

G =

H =

Clearance to unventilated soffit

Clearance to outside corner

Clearance to inside corner

Clearance to each side of center line ex tended above meter / regulator assembly

I =

Clearance to service regulator

vent outlet

J =

Clearance to non-mechanical air

supply inlet to building or the com

bustion air inlet to any other ap

* Equal to or greater than soffit depth.

* No minimum to outside corner * No minimum to outside corner

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

above the meter / regulator assembly

* 3 feet (.9m)

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

1 foot (30 cm) above opening

pliance

K =

L =

Clearance to mechanical air sup

ply inlet

Clearance above paved sidewalk or

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

(3m) horizontally

7 feet (2.1m)†

paved driveway located on public property

Clearance under veranda, porch, deck or balcony

M =

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 † 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.

*12 inches (305mm)‡

FIGURE 33

Fixed

Closed

AREA WHERE TERMINAL IS NOT PERMITTED

Canadian Installations

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

above average snow accumulation.

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)

* 12”

* Equal to or greater than soffit depth.

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

above the meter / regulator assembly

3 feet (.9m)

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)

6 feet (1.8m)

7 feet (2.1m)†

12 inches (305mm)‡

*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.”

Page 26

Page 27

VENT TERMINATION CLEARANCES

FOR DIRECT VENT INSTALLATIONS IN THE USA AND CANADA

INSIDE CORNER

DETAIL

Fixed

Closed

Operable

VENT TERMINAL

AIR SUPPLY INLET

US Installations

A =

B =

Clearance above grade, veranda,

porch, deck or balcony

Clearance to window or

door that may be opened

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

above average snow accumulation.

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)

C =

Clearance to permanently

* 12”

closed window

D =

Vertical clearance to ventilated soffit

located above the terminal within a

* Equal to or greater than soffit depth

horizontal distance of 2 feet (610mm)

from the center line of the terminal

E =

F =

G =

H =

Clearance to unventilated soffit

Clearance to outside corner

Clearance to inside corner

Clearance to each side of center line ex

tended above meter / regulator assembly

I =

Clearance to service regulator

vent outlet

J =

Clearance to non-mechanical air

supply inlet to building or the com

bustion air inlet to any other ap

pliance

* Equal to or greater than soffit depth * Equal to or greater than soffit depth

* No minimum to outside corner

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

above the meter / regulator assembly

3 feet (.9m)

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)

K =

Clearance to mechanical air sup

ply inlet

L =

Clearance above paved sidewalk or

paved driveway located on public property

M =

Clearance under veranda, porch, deck or balcony

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

† 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.

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

(3m) horizontally

* 7 feet (2.1m)

*12 inches (305mm)‡

FIGURE 34

Fixed

Closed

AREA WHERE TERMINAL IS NOT PERMITTED

Canadian Installations

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

above average snow accumulation.

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)

* 12”

* Equal to or greater than soffit depth* Equal to or greater than soffit depth

* No minimum to outside corner

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

above the meter / regulator assembly

3 feet (.9m)

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)

6 feet (1.8m)

7 feet (2.1m)†

12 inches (305mm)‡

Page 27

Page 28

Details of Intake and Exhaust Piping Terminations for Direct Vent Installations

NOTE - In Direct Vent installations, combustion air is tak en from outdoors and flue gases are discharged to out doors.

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 43.

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 35 through 42 show typical ter minations.

1 - Vent 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

36). You may exit the exhaust out the roof and the in take out the side of the structure (figure 37).

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.

NOTE - When venting in different pressure zones, the maximum separation requirement of intake and ex haust pipe DOES NOT apply.

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

nate straight down using two 90° elbows (See figure

35).

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 10.

TABLE 10

EXHAUST PIPE TERMINATION SIZE REDUCTION

EL296

MODEL

*045 and *070

*090 2” (51mm)

110 2” (51mm)

*EL296DFV-045, -070 and -090 units with the flush-mount termina tion must use the 1-1/2”accelerator supplied with the kit.

Termination

Pipe Size

1-1/2” (38mm)

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 figure 43.

NOTE - Care must be taken to avoid recirculation of exhaust back into intake pipe.

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 figure 43.

Inches(mm)

8” (203mm) MIN

12” (305mm) ABOVE

AVERAGE SNOW ACCUMULATION

3” (76mm) OR

2” (51mm) PVC

PROVIDE SUPPORT

FOR INTAKE AND

EXHAUST LINES

DIRECT VENT ROOF TERMINATION KIT

3”(76mm) MAX.

(15F75 or 44J41)

SIZE TERMINATION

PIPE PER TABLE 10.

UNCONDITIONED

ATTIC SPACE

FIGURE 35

Exiting Exhaust and Intake Vent

(different pressure zone)

Inlet Air

Exhaust

Pipe

Furnace

(Minimum 12in.

(305 mm) Above

grade or snow accumulation)

FIGURE 36

Exiting Exhaust and Intake Vent

(different pressure zone)

Roof T

erminated

Exhaust Pipe

Inlet Air

Furnace

(Minimum 12in.

(305 mm) Above

grade or snow accumulation)

FIGURE 37

Page 28

Page 29

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. At least one bracket must be used within 6” from the top of the el bow and then every 24” (610mm) as shown in figure 43, to prevent any movement in any direction. When exhaust and intake piping must be run up an outside wall, the exhaust piping must be terminated with pipe sized per table 10.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 40.

1-1/2” (38mm) accelerator

provided on 71M80 & 44W92

kits for EL296DFV045P36B-

& 070P36B

12” (305mm)

Minimum

Above Average

Snow

Accumulation

INTAKE

FLASHING

(Not Furnished)

SHEET METAL STRAP

(Clamp and sheet metal strap must be field installed to support the weight of the termination kit.)

CLAMP

FIELD-PROVIDED

REDUCER MAY BE REQUIRED

TO ADAPT LARGER VENT

PIPE SIZE TO TERMINATION

DIRECT VENT CONCENTRIC ROOFTOP TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

FIGURE 38

EXHAUST

VENT

5”

(127mm)

5-1/2”

(140mm)

12”

(305mm)

INTAKE

AIR

18” MAX. (457mm)

Front View

EXHAUST VENT

12” (305mm) Min.

above grade or

Inches (mm)

INTAKE

average snow ac

cumulation.

AIR

optional intake elbow

Side View

OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT

INSTALLATION OF DIRECT VENT WALL TERMINATION KIT

(30G28 or 81J20)

FIGURE 40

2” EXTENSION FOR 2” PVC PIPE 1” EXTENSION FOR 3” PVC PIPE

4''

FURNACE

INTAKE

PIPE

(all-045, -070 and -090 units)

FLUSH-MOUNT SIDE WALL TERMINATION KIT

51W11 (US) or 51W12 (Canada)

FURNACE EXHAUST

PIPE

GLUE EXHAUST

END FLUSH INTO

TERMINATION

1-1/2” ACCELERATOR

FIGURE 41

EL296DFV DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

STRAIGHT-CUT OR

ANGLE-CUT IN DIRECTION

OF ROOF SLOPE *

1-1/2” (38mm) accelerator

FIELD-PROVIDED

REDUCER MAY BE

REQUIRED TO ADAPT

LARGER VENT PIPE

SIZE TO TERMINATION

EXHAUST

AIR

INTAKE

AIR

(Not Furnished)

OUTSIDE

WALL

CLAMP

provided on 71M80 &

EL296DFV045P36B- &

INTAKE

AIR

INTAKE

AIR

DIRECT VENT CONCENTRIC WALL TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

FIGURE 39

44W92 kits for

070P36B

EXHAUST

AIR

12” (305mm) Min.

above grade or

average snow ac

cumulation.

GRADE

Page 29

8” - 12”

(203mm - 305mm)

Minimum 12” (305MM)

above chimney top

plate or average snow

accumulation

*SIZE TERMINATION PIPE PER TABLE 10.

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.

INTAKE PIPE

INSULATION (optional)

SHEET

METAL TOP

PLATE

INSULATE

TO FORM

SEAL

3” - 8” (76mm203mm)

SHOULDER OF FITTINGS

PROVIDE SUPPORT

OF PIPE ON TOP PLATE

3” - 8”

(76mm-

203mm)

ALTERNATE

INTAKE PIPE

EXTERIOR

PORTION OF

CHIMNEY

FIGURE 42

Page 30

NOTE − FIELD−PROVIDED

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

* WALL

SUPPORT

REDUCER MAY BE

TO TERMINATION

STRAIGHT

APPPLICATION

EXTENDED

APPLICATION

FIELD FABRICATED WALL TERMINATION

A− Minimum clearance

above grade or average

snow accumulation

B− Maximum horizontal separation between

intake and exhaust

C1 -Minimum from end of

exhaust to inlet of intake

C2 -Minimum from end of

exhaust to inlet of intake

D− Maximum exhaust

pipe length

E− Maximum wall support

distance from top of each

pipe (intake/exhaust)

See venting table 7 for maximum venting lengths with this arrangement.

* Use wall support every 24” (610 mm). Use two wall supports if extension is greater than 24” (610 mm) but less than 48” (1219 mm). NOTE − One wall support must be within 6” (152 mm) from top of each pipe (intake and exhaust) to prevent movement in any direction.

Intake Elbow

2” (51mm)

Vent Pipe

12” (305 mm)

6” (152 mm)

3” (76mm)

Vent Pipe

12” (305 mm)

6” (152 mm)6” (152 mm)

8” (203 mm)8” (203 mm)

6” (152 mm)6” (152 mm)

20” (508 mm)

6” (152 mm)

ALTERNATE TERMINATIONS (TEE & FORTY−FIVE DEGREE ELBOWS ONLY)

2” (51MM)

12”

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

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

Intake Elbow

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

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 recommended. 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.

Front View of

Intake and Exhaust

Intake

Exhaust

A− Clearance above

grade or average snow

accumulation

B− Horizontal

separation between

intake and exhaust

C− Minimum from

end of exhaust to

inlet of intake

D− Exhaust pipe length

E− Wall support distance

from top of each pipe

(intake/exhaust)

Vent Pipe

12” (305 mm) Min. 12” (305 mm) Min.

6” (152 mm) Min. 24” (610 mm) Max.

9” (227 mm) Min.

12” (305 mm) Min. 16” (405 mm) Max.

6” (152 mm) Max.

3” (76MM)

Vent Pipe

6” (152 mm) Min. 24” (610 mm) Max.

9” (227 mm) Min.

12” (305 mm) Min. 20” (508 mm) Max.

6” (152 mm) Max.

FIGURE 43

Page 30

Page 31

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 45 through 44 show typical terminations.

1 -Exhaust piping must terminate straight out or up as shown. The termination pipe must be sized as listed in table 10.The specified pipe size ensures proper ve locity required to move the exhaust gases away from the building. 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. 3 -If exhaust piping must be run up a side wall to posi

tion above snow accumulation or other obstructions, piping must be supported every 24 inches (610mm). When exhaust piping must be run up an outside wall, any reduction in exhaust pipe size must be done after the final elbow.

4 - Distance between exhaust pipe terminations on mul

tiple furnaces must meet local codes.

12” (305mm) ABOVE AVE.

SNOW

ACCUMULATION

3” (76mm) OR

2” (51mm) PVC

PROVIDE SUPPORT

FOR EXHAUST LINES

NON-DIRECT VENT ROOF TERMINATION KIT

(15F75 or 44J41)

FIGURE 45

SIZE TERMINATION

PIPE PER TABLE

10.

UNCONDITIONED

ATTIC SPACE

EL296DFV NON-DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

SIZE TERMINATION

PIPE PER TABLE 10.

3” - 8”

(76mm-

Minimum 12” (305MM)

above chimney top

plate or average snow

accumulation

METAL TOP

INSULATE TO FORM

SEAL

203mm)

SHEET

PLATE

STRAIGHT-CUT OR

ANGLE-CUT IN DIRECTION

OF ROOF SLOPE

SHOULDER OF FITTINGS

PROVIDE SUPPORT

OF PIPE ON TOP PLATE

3” - 8”

(76mm-

203mm)

EXTERIOR

PORTION OF

CHIMNEY

FIGURE 44

Page 31

Page 32

Condensate Piping

This unit is designed for either right‐ or left‐side exit of con densate piping. Refer to figures 46 and 47 for condensate trap locations.

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.

CONDENSATE TRAP AND PLUG LOCATIONS

Trap

(same

on right

side)

Plug

(same on left side)

1-1/2 in.

FIGURE 46

CONDENSATE TRAP LOCATION

(shown with right side exit of condensation)

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.

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

extension and remove plug (figure 46) 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.

NOTE - Cold end header box drain plugs are factory in stalled. Check the unused plug for tightness to prevent leakage.

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

of the trap. Secure with clamp. See figure 52.

4 - Install drain trap using appropriate PVC fittings, glue

all joints. Glue the provided drain trap as shown in fig ure 52. Route the condensate line to an open drain.

5 - Figure 49 shows the furnace and evaporator coil using

a separate drain. If necessary, the condensate line from the furnace and evaporator coil can drain togeth er. See figures 50 and 51. The field provided vent must be a minimum 1” to a maximum 2” length above the condensate drain outlet connection.

NOTE - If necessary the condensate trap may be installed up to 5 feet away from the furnace. Piping from furnace must slope down a minimum of 1/4” per ft. toward trap.

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 48.

Field Provided Drain Components

Trap can be installed a maximum of 5ft. from furnace (*PVC only)

Field Provided Vent

1” min. 2” max. above

condensate drain.

1” min. 2” max.

5’ max.

to drain

*Piping from furnace must slope down a minimum of 1/4” per ft. toward trap.

FIGURE 47

Elbow

Barbed Fitting

Tubing

Hose Clamp

FIGURE 48

Page 32

Page 33

6 - If unit will be started immediately upon completion of

installation, prime trap per procedure outlined in Unit Start-Up section.

EL296DFV with Evaporator Coil Using a Common Drain

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. Heat cable kit is avail able 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.

EL296DFV with Evaporator Coil

Using a Separate Drain

Field Provided Vent

1” min. 2” max. above

condensate drain.

Condensate

Drain Connection

Field Provided Vent

1” min. 2” max. above

condensate drain.

Condensate Drain

Connection

Evaporator Drain

Line

(vent required)

FIGURE 50

Condensate Trap With Optional Overflow Switch

From Evaporator Coil

Field Provided Vent

1” min. 2” max. above

condensate drain.

Evaporator Drain Line

(vent required)

FIGURE 49

IMPORTANT

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.

FurnaceCondensate

DrainConnection

Optional

Drain

FIGURE 51

CAUTION

Do not use copper tubing or existing copper condensate lines for drain line.

Page 33

Page 34

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)

Condensate Drain

Connection In Unit

90° Street Elbow 3/4 inch PVC ( furnished)

Trap

Optional Drain Piping FromTrap

Drain Assembly for 1/2 inch Drain Pipe

1/2 inch PVC Pipe

(Not Furnished)

90° Elbow

1/2 inch PVC

(Not Furnished)

Drain

Drain Assembly for 3/4 inch Drain Pipe

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

Elbow 3/4 inch PVC

90°

(Not Furnished)

1/2 inch PVC Pipe

(Not Furnished)

Adapter 3/4 inch slip X

3/4 inch mpt (not furnished)

ent

5 Feet

Maximum

3/4 inch PVC Pipe

(Not Furnished)

Coupling 3/4 inch slip X slip

Drain Trap

Assembly

(Furnished)

Condensate Drain Connection In Unit

(Not Furnished)

90° Elbow

3/4 inch PVC

(Not Furnished)

Drain

DrainTrap Assembly

(Furnished)

(178)

Drain Trap Clean Out

90° Elbow

3/4 inch PVC

(Not Furnished)

Coupling 3/4 inch slip X slip

Drain

DrainTrap Assembly with 1/2 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

(Not Furnished)

Vent

1/2 inch

Condensate Drain

Connection In Unit

Drain

DrainTrap Assembly with 3/4 inch Piping

1 (25 mm) Min. 2 (50 mm) Max. Above Top Of Condensate Drain Connection In Unit

Vent

3/4 inch

Condensate Drain

Connection In Unit

Drain

FIGURE 52

Page 34

Page 35

Gas Piping

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.

WARNING

Do not over torque (800 in-lbs) or under torque (350 in-lbs) when attaching the gas piping to the gas valve.

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 54. The maximum torque is 800 in lbs and mini mum torque is 350 in lbs when when attaching the gas piping to the gas valve.

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 11 lists recommended pipe sizes for typical applications.

NOTE - Use two wrenches when connecting gas pip ing to avoid transferring torque to the manifold.

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 54.

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.

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 60.

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.

IMPORTANT

Compounds used on threaded joints of gas piping must be resistant to the actions of liquified petro leum gases.

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.

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

MANUAL MAIN SHUT-OFF

VALVE WILL NOT HOLD

NORMAL TEST PRESSURE

1/8” N.P.T. PLUGGED TAP

FIGURE 53

CAP

FURNACE

ISOLATE

GAS VALVE

IMPORTANT

When testing pressure of gas lines, gas valve must be disconnected and isolated. See figure 53. Gas valves can be damaged if subjected to pressures greater than 1/2 psig (3.48 kPa).

WARNING

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.

FIRE OR EXPLOSION HAZARD

Page 35

Page 36

MANUAL

MAIN SHUT-OFF

VALV E

(With 1/8 in. NPT

Plugged Tap Shown)

GROUND

JOINT

UNION

Left Side Piping

(Standard)

AUTOMATIC

GAS VALVE

AUTOMATIC

GAS VALVE

MANUAL

MAIN SHUT-OFF

VALV E

(With 1/8 in. NPT

Plugged Tap

Shown)

GROUND

JOINT

UNION

DRIP LEG

FIELD

PROVIDED

DRIP LEG

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

AND INSTALLED

FIGURE 54

GAS PIPE CAPACITY - FT

TABLE 11

Nominal

Iron Pipe

Size

inches

(mm)

1/2

(12.7)

3/4

(19.05)

(25.4)

1-1/4

(31.75)

1-1/2

(38.1)

(50.8)

2-1/2

(63.5)

(76.2)

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

Internal

Diameter

inches

(mm)

.622

(17.799)

.824

(20.930)

1.049

(26.645)

1.380

(35.052)

1.610

(40.894)

2.067

(52.502)

2.469

(67.713)

3.068

(77.927)

(3.048)20(6.096)30(9.144)40(12.192)50(15.240)60(18.288)70(21.336)80(24.384)90(27.432)

172

(4.87)

360

(10.19)

678

(19.19)

1350

(38.22)

2090

(59.18)

4020

(113.83)

6400

(181.22)

11300

(319.98)

118

(3.34)

247

(7.00)

466

(13.19)

957

(27.09)

1430

(40.49)

2760

(78.15)

4400

(124.59)

7780

(220.30)

(2.69)

199

(5.63)

374

(10.59)

768

(22.25)

1150

(32.56)

2220

(62.86)

3530

(99.95)

6250

(176.98)

(18.60)

(27.89)

(53.80)

(85.51)

(151.49)

Length of Pipe - feet (m)

(2.29)

170

(4.81)

320

(9.06)

657

985

1900

3020

5350

(2.03)

151

(4.28)

284

(8.04)

583

(16.50)

873

(24.72)

1680

(47.57)

2680

(75.88)

4740

(134.22)

/HR (kL/HR)

(1.84)

137

(3.87)

257

(7.27)

528

(14.95)

791

(22.39)

1520

(43.04)

2480

(70.22)

4290

(121.47)

(1.69)

126

(3.56)

237

(6.71)

486

(13.76)

728

(20.61)

1400

(39.64)

2230

(63.14)

3950

(111.85)

(1.58)

(3.31)

(6.23)

(12.79)

(19.17)

(36.81)

(58.89)

(103.92)

Right Side Piping

(Alternate)

(1.47)

117

110

(3.11)

220

207

(5.86)

452

424

(12.00)

677

635

(17.98)

1300

1220

(34.55)

2080

1950

(55.22)

3670

3450

(97.69)

100

(30.480)

(1.42)

104

(2.94)

195

(5.52)

400

(11.33)

600

(17.00)

1160

(32.844)

1840

(52.10)

3260

(92.31)

Page 36

Page 37

Electrical

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

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.

WARNING

Electric Shock Hazard. Can cause injury or death. Unit must be properly grounded in accordance with national and local codes.

WARNING

Fire Hazard. Use of aluminum wire with this product may result in a fire, causing property dam age, severe injury or death. Use copper wire only with this product.

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

EXTERIOR MAKE-UP BOX

(FIELD PROVIDED RIGHT SIDE)

MAKE-UP

BOX OUTSIDE CABINET

Right Side

FIGURE 55

Refer to figure 58 for unit schematic and field wiring. See figures 56 and 57 for icomfort Wi-Fi communicating applications. Table 13 shows DIP switch and on-board link settings for non-communicating thermo stat applications. Typical wiring schematic is shown in fig ure 58.

thermostat wiring in

CAUTION

Failure to use properly sized wiring and circuit breaker may result in property damage. Size wiring and circuit breaker(s) per Product Specifications bulletin (EHB) and unit rating plate.

The power supply wiring must meet Class I restric

tions. Protected by either a fuse or circuit breaker, se lect circuit protection and wire size according to unit nameplate.

NOTE - Unit nameplate states maximum current draw. Maximum over-current protection allowed is shown in table

12.

TABLE 12

EL296DFV Model

045V36B, 070V48B 15

090V60C, 110V60C 20

Holes are on both sides of the furnace cabinet to facili

tate wiring.

Install a separate (properly sized) disconnect switch

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

Before connecting the thermostat or the power wiring,

check to make sure the wires will be long enough for servicing at a later date. Remove the blower access panel to check the length of the wire.

Complete the wiring connections to the equipment.

Use the provided unit wiring diagram and the field wir ing diagrams shown in table 13 and figure 58. Use 18-gauge wire or larger that is suitable for Class II ra ting for thermostat connections.

Electrically ground the unit according to local codes or,

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

NOTE - The EL296DFV furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.

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

on the furnace integrated control. Any electronic air cleaner or other accessory rated up to one amp can be connected to this terminal with the neutral leg of the cir cuit being connected to the one of the provided neutral terminals. See figure 59 for control configuration. This terminal is energized when the indoor blower is operat ing.

An unpowered, normally open (dry) set of contacts

with a 1/4” spade terminal “HUM” are provided for hu midifier connections and may be connected to 24V or 120V. Any humidifier rated up to one amp can be con

Maximum Over-Current

Protection (Amps)

Page 37

Page 38

nected to these terminals. In 120V humidifier applica tions the neutral leg of the circuit can be connected to one of the provided neutral terminals. This terminal is energized in the heating mode.

Install the room thermostat according to the instruc

tions provided with the thermostat. See table 13 for field wiring connections in varying applications. If the furnace is being matched with a heat pump, refer to the instruction packaged with the dual fuel thermostat.

Thermostat Selection

CAUTION

Field wiring for both communicating and non-com municating applications is illustrated in diagrams, which begin on Page 39.

Non-Communicating

In non-communicating applications the EL296DFV is de signed to operate in a SINGLE-STAGE mode or TWOSTAGE mode using a conventional thermostat.

For optimal performance in non-communicating applica tions, Lennox recommends use of a ComfortSense high quality electronic digital thermostat or any other with adjustable settings for 1st stage / 2nd stage on / off differen tials and adjustable stage timers.

Communicating

In communicating applications the icomfort Wi-Fi® thermo stat must be used. Refer to the instructions provided with the thermostat for installation, set-up and operation. In communicating system all unused thermostat wire in the wire bundle needs to be terminated inside and out. The ex tra wires can terminate on the 'C” terminal of the icomfort communication terminal strip. (RSBus). Using an addition al wire come off ”C” terminal and wire nut all the extra wires together. Termination on the outdoor control must match the indoor control.

7000

Indoor Blower Speeds

Non-Communicating

When the thermostat is set to “FAN ON,” the indoor blower will run continuously at a field selectable per centage of the second-stage cooling speed when there is no cooling or heating demand. The factory default setting is 38% of cool speed.

When the EL296DFV is running in the heating mode, the indoor blower will run on the heating speed desig nated by the positions of DIP switches 11, 12 and 13.

When there is a cooling demand, the indoor blower will run on the cooling speed designated by the positions of DIP switches 5 and 6. First stage cooling will run at 70% cool speed.

Communicating

NOTE - When the EL296DFV is used with icomfort

Touch

thermostat, proper indoor blower speed selec

tions are made by the communicating thermostat.

When the thermostat is set to “FAN ON,” the indoor blower will run at setting determined during system configuration.

When there is a heating demand the fan will run on heating speeds for firing rate.

When there is a cooling demand, the fan will run on the first stage and second stage cooling speed set using the icomfort Wi-Fi

thermostat in the installer setup mode. The factory default is based upon 400 CFM a ton.

Generator Use - Voltage Requirements

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

 The furnace requires 120 volts (Range: 102 volts to

132 volts)

 The furnace operates at 60 Hz +

5% (Range: 57 Hz to

63 Hz)

 The furnace integrated control requires both correct

polarity and proper ground. Both polarity and proper grounding should be checked before attempting to op erate the furnace on either permanent or temporary power

 Generator should have a wave form distortion of less

than 5% THD (total harmonic distortion)

Page 38

Page 39

iComfort

Thermostat with a Non-

Communicating Outdoor Unit

iComfort® Thermostat with an

iComfortt-ENABLED Outdoor Unit

icCmforti® Thermostat iComfort®-Enabled Indoor Furnace Non-Communicating Outdoor Air Conditioner

icomfort®-

ENABLED

OPTIONAL

DISCHARGE

AIR SENSOR

iComfort®

THERMOSTAT

CLIP ON-BOARD LINK W915 (Y1 TO Y2) FOR

TWO-STAGE OPERATION

FURNACE

NON-COMMUNICATING

OUTDOOR AIR

CONDITIONING UNIT -

1 OR 2 STAGE

OPTIONAL OUTDOOR

AIR SENSOR

iComfort® Thermostat iComfort®-Enabled Indoor Furnace iComfort-Enabled Outdoor Air Conditioner or Heat Pump

icomfort®ENABLED FURNACE

OPTIONAL

DISCHARGE

AIR SENSOR

OPTIONAL OUTDOOR

AIR SENSOR

iComfort®

THERMOSTAT

iComfort

OUTDOOR AIR CONDITIONING

OR HEAT PUMP UNIT

- ENABLED

Outdoor Unit

Indoor Unit Controller

Single wire to

Single wire to terminal C

Unused wires

terminal C

Unused wires

Communicating systems using the IComfort® thermostat require four thermo stat wires between the thermostat and the furnace/air handler control and four wires between the outdoor unit and the furnace/air handler control. When a thermostat cable with more than four wires is used, the extra wires must be properly connected to avoid electrical noise. The wires must not be left discon nected.

Use wire nuts to bundle the four unused wires at each end of the cable. A single wire should then be connected to the indoor unit end of the wire bundle and attached to the “C” terminals as shown above.

FIGURE 56

iComfort®

THERMOSTAT

Page 39

Page 40

Optional Accessories for use with any iComfort Touch® System

NOTE: IComfort® THERMOSTAT SENSES HUMIDITY & CON TROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT REQUIRED.

OPTIONAL OUTDOOR AIR SENSOR FOR USE WITH HUMIDI FIER (IF NOT ALREADY IN THE SYSTEM FOR OTHER FUNC TIONS. BUILT INTO ALL iComfort by Lennox®OUTDOOR UNITS).

120V CONNECTIONS

“HUM” CONTACT IS CLOSED ANYTIME HUMIDITY DEMAND IS PRESENT

icomfort® ENABLED

Discharge Air Sen

sor (Required for

even heat)

THERMOSTAT

EL296DFV FURNACE

IComfort

RSBus

Maximum total length of all connec tions on the RSBus is limited to 1500ft.

Wire gauge of RSBus wire is 18.

iComfort ENABLED OUTDOOR AIR CONDITIONING OR HEAT

PUMP UNIT

ENABLED

icomfort

EL296DFV FURNACE

(POWER COMPANY INTERRUPTION SYSTEMS ARE WIRED SAME AS OVERFLOW SWITCH)

HEPA BYPASS FILTER X2680 HEPA INTERLOCK KIT

PASS INDOOR BLOWER MO TOR COMMON WIRE THROUGH CURRENT LOOP.

ENABLED

icomfort

EL296DFV FURNACE

SEE HEPA INTERLOCK KIT FOR INSTALLATION DETAILS

LVCS VENTILATION CONTROL SYSTEM

SEE LVCS VENTILATION INSTRUCTIONS FOR DAMPER & SENSOR WIRING

NOTE: 24V UV LIGHT APPLICATIONS

In an iComfort

by Lennox® sys tem, neither furnace nor air handler transformer will have adequate VA to power 24V UV light applications. An additional transformer for UV light applications is required.

IComfort

THERMOSTAT

HVAC EQUIPMENT

STANDARD 1 OR 2 STAGE

AC OR HP UNIT

2 STAGE FURNACE

24V HUMIDIFIER CONNECTIONS

CS 7000 THERMOSTAT

CONVENTIONAL NONCOMMUNICATING SYSTEM

COMMUNICATING SYSTEM

*24V IN jumper not used in noncommunicating configuration

*24V IN JUMPER

icomfort® ENABLED EL296DFV FURNACE

DEHUMIDIFIER CONTROL

Rf WGhGsCf

HVAC EQUIP

NON-COMMUNICATING SYSTEM WIRING

ENABLED

icomfort

EL296DFV FURNACE

FIGURE 57

Page 40

CUT R-DS W914

COMMUNICATING SYSTEM WIRING

Page 41

Thermostat

1 Heat / 1 Cool

NOTE - Use DIP switch 2 to set second-stage heat ON delay. OFF-7 minutes. ON-12 minutes.

TABLE 13

EL296 Field Wiring Applications With Conventional Thermostat

DIP Switch Settings and On-Board Links (See figure 59)

DIP Switch 1

Thermostat

Heating

On Board Links Must Be Cut To Select

System Options

Stages

DO NOT CUT ANY ON-BOARD LINKS

Wiring Connections

T'STAT

*Not required on all units

FURNACE

TERM. STRIP

OUTDOOR

UNIT

1 Heat / 2 Cool

NOTE - Use DIP switch 2 to set second-stage heat ON delay. OFF-7 minutes. ON-12 minutes.

1 Heat / 2 Cool with t'stat with humidity control

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

COMPR

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

CUT ON-BOARD LINK

W914

DEHUM

HARMONY

T'STAT

*Not required on all units

T'STAT

*Not required on all units

FURNACE

TERM. STRIP

FURNACE

TERM. STRIP

OUTDOOR

UNIT

OUTDOOR

UNIT

Page 41

Page 42

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (See figure 59)

DIP Switch 1

Thermostat

Heating

Stages

2 Heat / 2 Cool OFF

TABLE 13

On Board Links Must Be Cut To Select

System Options

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

Wiring Connections

T'STAT

*Not required on all units

FURNACE

TERM. STRIP

OUTDOOR

UNIT

2 Heat / 2 Cool with t'stat with humidity control

2 Heat / 1 Cool with t'stat with humidity control

OFF

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

CUT ON-BOARD LINK

W914

DEHUM

HARMONY

CUT ON-BOARD LINK

W914

DEHUM

HARMONY

T'STAT

*Not required on all units

T'STAT

*Not required on all units

FURNACE

TERM. STRIP

FURNACE

TERM. STRIP

OUTDOOR

UNIT

OUTDOOR

UNIT

2 Heat / 1 Cool OFF

DO NOT CUT ANY ON-BOARD LINKS

Page 42

T'STAT

*Not required on all units

FURNACE

TERM. STRIP

OUTDOOR

UNIT

Page 43

Thermostat

Dual Fuel Single Stage Heat Pump

ComfortSense thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control

TABLE 13

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (figure 59)

DIP Switch 1

Thermostat

Heating

On Board Links Must Be Cut To Select

System Options

Wiring Connections

Stages

FURNACE

TERM. STRIP

OFF

CUT ON-BOARD LINK

W951 HEAT

PUMP

T'STAT

HEAT PUMP

67M41*

Dual Fuel Two Stage Heat Pump

ComfortSense

OFF

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

T'STAT

FURNACE

TERM. STRIP

HEAT PUMP

67M41*

thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control

CUT ON-BOARD LINK

W951 HEAT

PUMP

outdoor sensor

* 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.

outdoor

sensor

out blue

Page 43

Page 44

Thermostat

Dual Fuel Single Stage Heat Pump

ComfortSense thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control w/dehu midification control

TABLE 13

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (figure 59)

DIP Switch 1

Thermostat

Heating

On Board Links Must Be Cut To Select

System Options

Wiring Connections

Stages

FURNACE

TERM. STRIP

OFF

CUT ON-BOARD LINK

W951 HEAT PUMP

CUT ON-BOARD LINK

W914

DEHUM

HARMONY

T'STAT

HEAT PUMP

67M41*

Dual Fuel Two Stage Heat Pump

ComfortSense thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control w/dehu midification

OFF

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

CUT ON-BOARD LINK

W951 HEAT

PUMP

CUT ON-BOARD LINK

W914

DEHUM

HARMONY

T'STAT

FURNACE

TERM. STRIP

HEAT PUMP

67M41*

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.

outdoor

sensor

outdoor

sensor

Page 44

Page 45

EL296DFV Schematic Wiring Diagram

FIGURE 58

Page 45

Page 46

Integrated Control

7 SEGMENT LED

FLAME SENSE

DIAGNOSTIC

PUSH BUTTON

DIP SWITCHES

HUM

LINE 1

ACC

HS/ CAI

INDOOR

BLOWER

CONNECTOR

NEUTRAL

OUTDOOR AIR

SENSOR

TERMINALS

DISCHARGE AIR

SENSOR

TERMINALS

TB83

icomfortt

COMMUNICATING

OUTDOOR

EQUIPMENT

TB84

icomfortt

COMMUNICATING

INDOOR

THERMOSTAT

I + I -CRI + I -

TB82, future use

I+ = DATA HIGH CONNECTION I - = DATA LOW CONNECTION

TB83 icomfortt Communicating Outdoor Equipment

R = 24VAC I + = DATA HIGH CONNECTION I - = DATA LOW CONNECTION C = 24VAXC COMMON

TB84 icomfortt Communicating Indoor Thermostat

R = 24VAC I + = DATA HIGH CONNECTION I - = DATA LOW CONNECTION C = 24VAXC COMMON

1/4” QUICK CONNECT TERMINALS

HUM = UNPOWERED NORMALLY OPEN (DRY) CONTACTS

XMFR = 120 VAC OUTPUT TO TRANSFORMER

LI = 120 VAC INPUT TO CONTROL

ACC = 120 VAC OUTPUT TO OPTIONAL ACCESSORY

NEUTRALS = 120 VAC NEUTRAL

W1 W2 GY2Y1

NON-COMMUNICATING

24V TERMINALS

12 PIN LOW

VOLTAGE

CONNECTOR

W915 Y1 TO Y2

2 STAGE COMPR

W951 R TO O HEAT PUMP

W914 R TO DS

DEHUM OR

RDHLODS

HARMONY

THERMOSTAT CONNECTIONS (TB1)

DS = DEHUMIDIFICATION SIGNAL 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

C = THERMOSTAT SIGNAL GROUND CONNECTED TO TRANSFORMER GRD (TR) & CHASIS GROUND (GRD)

Y1 = THERMOSTAT 1ST STAGE COOL SIGNAL

Y2 = THERMOSTAT 2ND STAGE COOL SIGNAL

O = THERMOSTAT SIGNAL TO HEAT PUMP

DH = DEHUMIDIFICATION OUTPUT COMMUNICATING

L = USE ONLY WITH A COMMUNICATING THERMOSTAT

AND A NON-COMMUNICATING OUTDOOR UNIT

REVERSING VALVE

THERMOSTAT ONLY

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

FIGURE 59

Page 46

Page 47

Integrated Control DIP Switch Settings Con ventional Thermostat (non-communicating)

EL296DFV units are equipped with a two-stage, variable speed 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 jumpers. The control includes an internal watchguard feature which automatically resets the ignition control when it has been locked out. After one hour of con tinuous thermostat demand for heat, the watchguard will break and remake thermostat demand to the furnace and automatically reset the control to relight the furnace.

Note: All icomfortt settings are set at the icomfort Wi-Fi thermostat. See icomfortt installation instruction. In icom fortt communication system all DIP switch and clippable link settings are ignored. For conventional thermostats pro ceed with DIP switch and clippable link settings as outlined in the following.

Heating Operation DIP Switch Settings 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 twostage thermostat. If a single-stage thermostat is to be used, the DIP switch must be repositioned.

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

trolled by a two-stage heating thermostat (factory set ting);

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.

Switch 2 -- Second Stage Delay (Used with SingleStage 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 secondstage heat is initiated. If the switch is toggled to the ON position, it will provide a 12-minute delay before secondstage heat is initiated. This switch is only activated when the thermostat selector jumper is positioned for SINGLEstage thermostat use.

Switches 3 and 4 -- 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 is shipped from the factory with a blower-off delay of 90 seconds. The blower off delay affects comfort and is adjustable to satisfy individ ual 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 temperatures; shorter set tings provide higher supply air temperatures.Table 14 pro vides the blower off timings that will result from different switch settings.

Blower Off Delay Switch Settings

Blower Off Delay

(Seconds)

60 On Off

90 (Factory) Off Off

120 Off On 180 On On

Indoor Blower Operation DIP Switch Settings

Switches 5 and 6 -- Cooling Mode Blower Speed -- The unit is shipped from the factory with the dip switches posi tioned for high speed (4) indoor blower motor operation during the cooling mode. Table 15 provides the cooling mode blower speeds that will result from different switch settings. Switches 5 and 6 set the blower cfm for secondstage cool. The integrated control automatically ramps down to 70% of the second-stage cfm for first-stage cfm. Refer to tables for corresponding cfm values.

Cooling Mode Blower Speeds

Speed

Low On On

Medium Low Off On

Medium High On Off

High (Factory) Off Off

Switches 7 and 8 -- Cooling Blower Speed Adjustment

-- The unit is shipped from the factory with the dip switches

positioned for NORMAL (no) adjustment. The dip switches may be positioned to adjust the blower speed by +10% or

-10% to better suit the application. Table 16 below provides blower speed adjustments that will result from different switch settings. Refer to tables for corresponding cfm val ues.

Cooling Blower Speed Adjustment

Adjustment

+10% (approx.) On Off

Factory Default Off Off

-10% (approx.) Off On

Switches 9 and 10 -- Cooling Mode Blower Speed Ramping -- Blower speed ramping may be used to en

hance dehumidification performance. The switches are factory set at option A which has the greatest effect on dehumidification performance. Table 17 provides the cooling mode blower speed ramping options that will result from different switch settings. The cooling mode blower speed ramping options are detailed on the next page.

NOTE - The off portion of the selected ramp profile also ap plies during heat pump operation in dual fuel applications.

TABLE 14

Switch 3 Switch 4

TABLE 15

Switch 5 Switch 6

TABLE 16

Switch 7 Switch 8

Page 47

Page 48

Cooling Mode Blower Speed Ramping

TABLE 17

Ramping Option

Switch 9 Switch 10

A (Factory) Off Off

B Off On C On Off D On On

Ramping Option D

S Motor runs at 100% until demand is satisfied.

S Once demand is met, motor ramps down to stop.

100% CFM

COMPRESSOR

DEMAND

OFFOFF

Ramping Option A (Factory Selection)

 Motor runs at 50% for 30 seconds.  Motor then runs at 82% for approximately 7-1/2 minu

tes.

 If demand has not been satisfied after 7-1/2 minutes,

motor runs at 100% until demand is satisfied.

 Once demand is met, motor runs at 50% for 30 sec

onds then ramps down to stop.

OFF

1/2 MIN 50% CFM

7 1/2 MIN 82% CFM

COMPRESSOR DEMAND

100% CFM

1/2 MIN 50% CFM

OFF

Ramping Option B

S Motor runs at 82% for approximately 7-1/2 minutes. If

demand has not been satisfied after 7-1/2 minutes, motor runs at 100% until demand is satisfied.

S Once demand is met, motor ramps down to stop.

OFF

7 1/2 MIN

82%CFM

COMPRESSOR DEMAND

100% CFM

OFF

Ramping Option C

S Motor runs at 100% until demand is satisfied.

S Once demand is met, motor runs at 100% for 45 sec

onds then ramps down to stop.

OFF

100% CFM

COMPRESSOR

DEMAND

100% CFM

45 SEC.

OFF

Switches 11, 12 and 13 -- Heating Mode Blower Speed --

The switches are factory set to the OFF position which pro vides factory default heat speed. Refer to table 18 for switches 11, 12 and 13 that provided the corresponding in creases or decrease to both high and low heat demand.

TABLE 18

Heating Mode Blower Speeds

Heat Speed

Switch11Switch12Switch

Increase 24% On On On

Increase 18% On On Off

Increase 12% On Off On

Increase 6% On Off Off

Factory Default Off Off Off

Decrease 6% Off Off On

Decrease 12% Off On Off

Decrease18% Off On On

Switches 14 and 15 -- Continuous Blower Speed --

Table 19 provides continuous blower speed adjustments that will result from different switch settings.

TABLE 19

Continuous Blower Speed

Continuous

Blower Speed

Switch 14 Switch 15

28% of High Cool Speed Off On

38% of High Cool Speed

(Factory)

Off Off

70% of High Cool Speed On Off

100% of High Cool Speed On On

Page 48

Page 49

On-Board Links

Note: In icomfortt systems with a conventional outdoor unit (non-communicating), the on-board clippable links must be set to properly configure the system.

mony III control will be blocked and also lead to control damage. Refer to table 20 for operation sequence in ap plications including EL296DFV, a thermostat which fea tures humidity control and a single-speed outdoor unit. Table 21 gives the operation sequence in applications with a two-speed outdoor unit.

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

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

WARNING

Carefully review all configuration information pro vided. Failure to properly set DIP switches, jumpers and on-board links can result in improper operation!

On-Board Link W914 Dehum or Harmony (R to DS)

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 either the Harmony III zone control or a thermostat which features humidity control. If the link is left intact the PMW signal from the Har

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.

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.

TABLE 20

OPERATING SEQUENCE

EL296DFV, Non-Communicating Thermostat with Humidity Control Feature and Single-Speed Outdoor Unit

OPERATING

SEQUENCE

System

Condition

NO CALL FOR DEHUMIDIFICATION

Normal Operation 1 On On On Acceptable

BASIC MODE (only active on a Y1 thermostat demand)

Normal Operation 1 On On On Acceptable

Dehumidification

Call

PRECISION MODE (operates independent of a Y1 thermostat demand)

Normal Operation 1 On On On Acceptable

Dehumidification

call

Dehumidification

call ONLY

Step

Jumpers at indoor unit with a single stage outdoor unit With Condensing unit - Cut W914 (R to DS) on SureLight With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight

Thermostat Demand Relative Humidity

Y1 O G

2 On On On Demand

1 On On On Demand

SYSTEM DEMAND SYSTEM RESPONSE

Status D

VAC

Compres

sor

High 100%

High 70%*

High 100%

High 70%*

control

Blower

CFM

(COOL)

control

Comments

Compressor and indoor blower follow thermostat demand

ComfortSense® 7500 thermostat energizes Y1 and de-energizes D on a call for de-humidification

Dehumidification mode begins when humidity is greater than set point

ComfortSense thermostat maintain room humidity setpoint by allowing the room space to maintain a cooler room thermostat setpoint**

7500

will try to

Dave Lennox ComfortSense® 7000 thermostat to use for this application - Y2081 4 heat / 2 cool *Dehumidification blower speed is 70% of COOL speed for all units . **In Precision mode, ComfortSense

7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.

Page 49

Page 50

TABLE 21

OPERATING SEQUENCE

EL296DFV, Non-Communicating Thermostat with Humidity Control Feature and Two-Speed Outdoor Unit

OPERATING

SEQUENCE

SYSTEM DEMAND SYSTEM RESPONSE

Thermostat Demand Relative Humidity

System

Condition

Ste

Y1 Y2 O G

W1W

Status D

NO CALL FOR DEHUMIDIFICATION

Normal Opera

tion - Y1

Normal Opera

tion - Y2

1 On On On Acceptable

2 On On On On Acceptable

VAC

ROOM THERMOSTAT CALLS FOR FIRST STAGE COOLING

BASIC MODE (only active on a Y1 thermostat demand)

Normal Opera

tion

Dehumidification

Call

1 On On On Acceptable

2 On On On On Demand

VAC

PRECISION MODE (operates independent of a Y1 thermostat demand)

Normal Opera

tion

Dehumidification

call

Dehumidification

call ONLY

1 On On On Acceptable

2 On On On On Demand

1 On On On On Demand

VAC

ROOM THERMOSTAT CALLS FOR FIRST AND SECOND STAGE COOLING

BASIC MODE (only active on a Y1 thermostat demand)

Normal Opera

tion

Dehumidification

Call

1 On On On On Acceptable

2 On On On On Demand

VAC

PRECISION MODE (operates independent of a Y1 thermostat demand)

Normal Opera

tion

Dehumidification

call

1 On On On Acceptable

2 On On On On Demand

VAC

Compressor

Low 70%*

High 100%

Low 70%*

High 70%**

Low 70%*

High 70%**

High 100%

High 70%**

Low 70%*

High 70%**

Blower

CFM

(COOL)

Comments

Compressor and indoor blower follow thermostat demand

ComfortSense

7500 thermostat energizes Y2 and de-energizes D on a call for de-humidification

Dehumidification mode begins when humidity is greater than set point

ComfortSense® 7500 thermostat will try to maintain room humidity setpoint by allowing the room space to maintain a cooler room thermostat setpoint***

ComfortSense® 7500 thermostat energizes Y2 and de-energizes D on a call for de-humidification

Dehumidification mode begins when humidity is greater than set point

Dehumidification

call ONLY

1 On On On On Demand

VAC

Jumpers at indoor unit with a two stage outdoor unit Cut factory jumper from Y1 to Y2 or cut W915 (Y1 to Y2) With Condensing unit - Cut W914 (R to DS) on SureLight

control

With Heat Pump - Cut W914 (R to DS) & W951 (R to O) on SureLight

Dave Lennox ComfortSense® 7500 thermostat to use for this application - Y2081 4 heat / 2 cool *Normal operation first stage cooling blower speed is 70% COOL speed. **Dehumidification blower speed is, reduced to 70% of COOL. ***In Precision mode, ComfortSense

7000 thermostat will maintain room temperature up to 2 °F (1.2°C) cooler than room setting.

Page 50

High 70%**

control

ComfortSense® 7500 thermostat will try to maintain room humidity setpoint by allowing the room space to maintain a cooler room thermostat setpoint***

Page 51

BLOWER DATA

EL296DF045XV36B BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

Heating Speed

DIP Switch

Settings

+24% 910 1150

+18% 855 1095

+12% 820 1040

+6% 770 990

Factory Default 745 935

–6% 700 880

–12% 665 820

–18% 635 755

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 640 755 850 975 895 1050 1210 1360

Factory Default 580 695 780 880 805 965 1105 1250

– 545 645 720 795 735 865 1000 1130

Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specic DIP Switch Set-

tings.

Factory default setting.

NOTES - The effect of static pressure is included in air volumes shown.

First stage HEAT is approximately 91% of the same second stage HEAT. First stage COOL (two-stage air conditioning units only) is approximately 70% of the same second stage COOL speed position. Continuous Fan Only speed is selectable at 28%, 38%, 70% and 100% of the selected second stage cooling speed - minimum 425 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 425 cfm.

First Stage Heating Speed - cfm Second Stage Heating Speed - cfm

COOLING

First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm

High Low Medium-Low Medium-High2 High

EL296DF045XV36B BLOWER MOTOR WATTS (COOLING)

Cooling Speed

DIP Switch

Settings

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Motor Watts @ Various External Static Pressures - in. wg.

First Stage Second Stage

+ Setting

Low 28 44 60 77 93 11 2 128 144 158 59 77 97 121 138 160 182 197 216 241 256

Cooling

Speed

Med-low 47 67 88 105 121 138 161 179 201 131 154 177 202 228 250 277 299 320 344 370

Med-High 69 91 11 3 132 160 183 204 220 246 199 215 248 275 308 340 360 390 407 431 445

High 100 117 153 172 192 215 240 260 286 292 313 363 379 419 452 488 511 526 523 524

Factory Default

Low 17 34 52 65 82 97 121 132 148 61 79 98 125

Cooling

Speed

Med-low 35 50 70 85 105 125 140 155 175 99 115 148 167 188 2 11 236 256 279 303 317

Med-High 54 72 95 113 131 148 173 189 210 147 170 197 223 252 278 301 330 355 373 398

High 74 96 118 141 168 190 212 233 252 216 229 258 303 325 356 390 410 426 448 465

– Setting

Low 17 31 49 61 75 91 107 123 136 46 64 82 101 115 134 155 174 196 205 221

Cooling

Speed

Med-low 28 45 61 77 93 11 2 129 144 159 72 92 114 133 160 184 204 221 247 263 282

Med-High 40 57 77 93 112 130 148 165 186 112 130 161 183 205 226 252 272

High 57 76 97 119 136 156 179 195 214 155 174 207 235 265 292 311 343 370 386 414

141 164 185 201 219 246 259

294 319 341

Page 5

Page 52

BLOWER DATA

EL296DF070XV48B BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

Heating Speed

DIP Switch

Settings

+24% 1085 1635

+18% 1030 1525

+12% 950 1450

+6% 910 1365

Factory Default 850 1310

–6% 790 1225

–12% 740 1135

–18% 680 1060

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 740 915 1055 1255 1110 1340 1575 1800

Factory Default 660 820 940 1120 995 1230 1420 1650

– 575 735 850 995 880 1085 1290 1460

Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specic DIP Switch Set-

tings.

Factory default setting.

NOTES - The effect of static pressure is included in air volumes shown.

First Stage Heating Speed - cfm Second Stage Heating Speed - cfm

COOLING

First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm

High Low Medium-Low Medium-High2 High

EL296DF070XV48B BLOWER MOTOR WATTS (COOLING)

Cooling Speed

DIP Switch

Settings

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Motor Watts @ Various External Static Pressures - in. wg.

First Stage Second Stage

+ Setting

Low 68 88 109 132 154 178 199 213 238 144 169 208 244 270 310 343 378 401 432 457

Cooling

Speed

Med-low 93 120 147 172 198 220 254 274 304 257 276 326 370 398 437 470 492 531 558 598

Med-High 120 152 180 220 254 281 318 344 380 390 428 472 526 574 611 659 706 745 788 820

High 214 237 284 324 352 390 424 456 474 627 604 663 721 775 825 869 908 915 881 864

Factory Default

Low 35 54 74 92 109 129 147 163 191 104 137 162 189

Cooling

Speed

Med-low 75 100 115 140 165 190 210 230 255 188 203 250 297 327 374 399 432 454 486 513

Med-High 99 129 159 179 209 236 270 293 329 304 340 376 418 450 495 533 567 613 637 674

High 157 184 232 264 285 335 365 406 419 454 469 537 589 634 669 724 770 818 833 840

– Setting

Low 27 49 63 73 98 11 6 135 155 168 86 111 135 162 186 206 236 257 283 306 339

Cooling

Speed

Med-low 67 87 109 132 154 177 199 212 238 129 156 187 226 258 288 325 353 385 409 441

Med-High 82 105 127 153 176 196 223 243 269 226 244 290 335 364 402 435 465

High 107 141 164 195 224 263 282 321 347 329 375 403 444 481 526 570 612 656 680 718

219 254 278 312 341 369 400

485 516 556

Page 5

Page 53

BLOWER DATA

EL296DF090XV60C BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

Heating Speed

DIP Switch

Settings

+24% 1425 1895

+18% 1355 1825

+12% 1280 1740

+6% 1215 1660

Factory Default 1160 1575

–6% 1055 1455

–12% 1010 1365

–18% 950 1265

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 1115 1265 1400 1600 1600 1750 1970 2130

Factory Default 1005 1150 1275 1450 1450 1630 1810 1975

– 890 1065 1150 1270 1270 1450 1645 1810

Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specic DIP Switch Set-

tings.

Factory default setting.

NOTES - The effect of static pressure is included in air volumes shown.

First Stage Heating Speed - cfm Second Stage Heating Speed - cfm

COOLING

First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm

High Low Medium-Low Medium-High2 High

EL296DF090XV60C BLOWER MOTOR WATTS (COOLING)

Cooling Speed

DIP Switch

Settings

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Motor Watts @ Various External Static Pressures - in. wg.

First Stage Second Stage

+ Setting

Low 79 108 144 162 207 242 262 293 323 275 299 366 399 449 483 532 584 605 644 680

Cooling

Speed

Med-low 120 156 187 233 261 279 329 368 401 387 409 471 521 562 606 650 688 716 762 800

Med-High 155 202 235 293 317 369 407 453 502 547 577 622 667 744 795 835 872 910 950 963

High 268 299 366 399 449 483 532 584 605 780 775 811 898 942 994 1048 1071 1082 1080 1073

Factory Default

Low 56 86 111 140 170 200 232 259 282 186 219 270 308

Cooling

Speed

Med-low 93 11 8 152 195 223 254 283 306 344 278 304 365 420 450 510 544 592 640 665 698

Med-High 123 161 201 228 260 310 341 381 416 446 475 528 582 616 662 686 747 780 823 855

High 182 219 270 308 361 390 431 489 517 576 603 654 704 756 809 871 902 939 972 975

– Setting

Low 48 69 101 120 152 175 201 218 249 118 155 181 232 259 299 340 376 402 438 476

Cooling

Speed

Med-low 65 94 123 150 185 220 250 278 296 177 205 267 304 353 390 430 486 515 563 587

Med-High 93 118 152 195 223 254 283 306 344 301 322 392 439 468 531 568 599

High 11 6 155 181 232 259 299 340 376 402 446 475 528 582 616 662 686 747 780 823 855

361 390 431 489 517 555 590

647 678 721

Page 5

Page 54

BLOWER DATA

EL296DF110XV60C BLOWER PERFORMANCE (less lter)

BOTTOM RETURN AIR

0 through 0.8 in. w.g. (Heating) and 0 through 1.0 in. w.g. (Cooling) External Static Pressure Range

HEATING

Heating Speed

DIP Switch

Settings

+24% 1535 2015

+18% 1445 1935

+12% 1370 1855

+6% 1300 1760

Factory Default 1220 1645

–6% 1135 1545

–12% 1070 1420

–18% 1000 1335

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 1095 1265 1395 1585 1585 1790 1990 2180

Factory Default 965 1130 1285 1440 1440 1630 1845 2005

– 860 1035 1130 1275 1275 1475 1655 1845

Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control. Refer to Installation Instructions for specic DIP Switch Set-

tings.

Factory default setting.

NOTES - The effect of static pressure is included in air volumes shown.

First Stage Heating Speed - cfm Second Stage Heating Speed - cfm

COOLING

First Stage Cooling Speed - cfm Second Stage Cooling Speed - cfm

High Low Medium-Low Medium-High2 High

EL296DF110XV60C BLOWER MOTOR WATTS (COOLING)

Cooling Speed

DIP Switch

Settings

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

Motor Watts @ Various External Static Pressures - in. wg.

First Stage Second Stage

+ Setting

Low 71 99 147 166 202 240 271 302 337 248 280 333 374 429 469 511 548 594 619 677

Cooling

Speed

Med-low 127 159 198 225 256 301 325 365 390 409 427 496 531 587 632 665 721 742 781 805

Med-High 162 204 242 287 316 371 408 446 487 563 589 651 703 755 808 860 888 932 970 1007

High 243 280 333 374 429 469 511 548 594 866 850 915 963 1020 1056 1091 1127 1141 1136 1131

Factory Default

Low 57 88 117 140 165 196 232 259 283 167 214 244 291

Cooling

Speed

Med-low 77 11 2 147 172 209 250 283 317 345 275 321 348 418 447 505 546 597 632 668 716

Med-High 122 154 199 230 268 300 331 373 4 11 461 493 547 572 628 666 703 745 777 819 860

High 167 214 244 291 331 380 405 467 497 601 626 688 730 787 823 880 924 963 994 1011

– Setting

Low 44 67 99 115 144 167 197 215 245 126 165 201 232 262 305 334 373 417 451 479

Cooling

Speed

Med-low 66 97 123 153 186 216 247 275 303 187 219 272 308 360 391 432 479 514 559 588

Med-High 77 112 147 172 209 250 283 317 345 308 341 390 430 490 528 569 617

High 127 165 201 232 262 305 334 373 417 461 493 547 572 628 666 703 745 777 819 860

331 380 405 467 497 539 583

640 691 724

Page 5

Page 55

Unit Start-Up

FOR YOUR SAFETY READ BEFORE OPERATING

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.

CAUTION

Before attempting to perform any service or mainte nance, turn the electrical power to unit OFF at dis connect switch.

WARNING

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.

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.

The gas valve on the EL296DFV is equipped with a gas control switch. Use only your hand to move switch. Never use tools. If 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:

EL296DFV units are equipped with an automatic hot sur face ignition system. Do not 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.

Priming Condensate Trap

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:

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

eration. 2 - Set the thermostat to initiate a heating demand. 3 - Allow the burners to fire for approximately 3 minutes. 4 - Adjust the thermostat to deactivate the heating de

mand.

attempt to manually light

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.

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

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 60)

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

this section. 2 - Set the thermostat to the lowest setting. 3 - Turn off all electrical power to the unit. 4 - This furnace is equipped with an ignition device which

automatically lights the burners. Do not try to light the

burners by hand. 5 - Remove the access panel. 6 - Move gas valve switch to OFF. See figure 60. 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. 8 - Move gas valve switch to ON. See figure 60. 9 - Replace the access panel.

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

11- Set the thermostat to desired setting.

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

INLET PRESSURE POST

GAS VALVE SHOWN IN ON POSITION

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

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

cian or gas supplier.

Turning Off Gas to Unit

1 - Set the thermostat to the lowest setting. 2 - Turn off all electrical power to the unit if service is to be

performed. 3 - Remove the access panel.

MANIFOLD

PRESSURE POST

FIGURE 60

HIGH FIRE ADJUSTMENT

SCREW

(under cap)

Page 55

Page 56

4 - Move gas valve switch to OFF. 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? 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.

Heating Sequence Of Operation

1 - When thermostat calls for heat, combustion air inducer

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

valve solenoid opens. A 4-second Trial for Ignition peri

od begins.” 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.

Gas Pressure Adjustment

Gas Flow (Approximate)

TABLE 22

GAS METER CLOCKING CHART

Seconds for One Revolution

EL296

Unit

-045 80 160 200 400

-070 55 110 136 272

-090 41 82 102 204

-110 33 66 82 164

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

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

Natural LP

1 cu ft

Dial

2 cu ft

Dial

1 cu ft

Dial

2 cu ft

DIAL

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 22. If manifold pressure matches table 24 and rate is incorrect, check gas orifices for proper size and restric tion. Remove temporary gas meter if installed.

Supply Pressure Measurement

An inlet pressure post located on the gas valve provides ac cess to the supply pressure. See figure 60. 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 24 for supply line pressure.

Manifold Pressure Measurement

A manifold pressure post located on the gas valve provides access to the manifold pressure. See figure 60. 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. To correctly measure manifold pressure, the differential pressure between the positive gas manifold and the nega tive burner box must be considered.

NOTE - Pressure test adapter kit (10L34) is available from Lennox to facilitate manifold pressure measurement.

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 “-”.

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

for steady state conditions.

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

manifold pressure and compare to value given in table

24.

5 - If necessary, make adjustments. Figure 60 shows

location of high fire and low fire adjustment screws.

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

table 24.

7 - Shut unit off and remove manometer as soon as an ac

curate reading has been obtained. Turn the supply and manifold 3/32” hex screw one revolution back into the gas valve.

8 - Start unit and perform leak check. Seal leaks if found.

Page 56

Page 57

Proper Combustion

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. The maximum carbon

monoxide reading should not exceed 100 ppm.

TABLE 23

CO2%

EL296 Model

Low Fire High Fire Low Fire High Fire

For Nat

045 5.6 - 6.6 7.8 - 8.8 6.6 - 7.6 9.1 - 10.1

070 5.5 - 6.5 7.3 - 8.3 6.5 - 7.5 8.6 - 9.6

090 5.9 - 6.9 7.8 - 8.8 6.9 - 7.9 9.1 - 10.1

110 6.3 - 7.3 8.2 - 9.2 7.3 - 8.3 9.5 - 10.5

The maximum carbon monoxide reading should not exceed 50 ppm.

Manifold and Supply Line Pressures at Varying Altitudes

CO2%

For L.P

TABLE 24

High Altitude Information

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 25 lists conversion kit and pressure switch require ments at varying altitudes.

The combustion air pressure switch is factory-set and re quires no adjustment.

Manifold Pressure in. wg.

EL296

Unit

All

Sizes

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.

Gas

Natural 1.7 3.5 1.6 3.3 1.5 3.2 1.5 3.1 1.7 3.5 4.5 13.0

LP/propane 4.9 10.0 4.6 9.4 4.4 9.1 4.3 8.9 4.9 10.0 11.0 13.0

0-4500 ft. 4501-5500 ft. 5501-6500 ft. 6501 - 7500ft. 7501 - 10000ft.

Low

Fire

High

Fire

Low

Fire

High

Fire

Low

Fire

High

Fire

Low Fire

High

Fire

Low Fire

High

Fire

Supply Line

Pressure

in. w.g.

0 - 10000 ft.

Min Max

TABLE 25

Conversion Kit and Pressure Switch Requirements at Varying Altitudes

EL296

Unit

-045

Natural to

LP/Propane

0 - 7500 ft

(0 - 2286m)

High Altitude

Natural Burner

Orifice Kit

7501 - 10,000 ft

(2286 - 3038m)

High Altitude

LP/Propane Burner

Orifice Kit

7501 - 10,000 ft

(2286 - 3038m)

High Altitude Pressure Switch

4501 - 7500 ft

(1373 - 2286m)

7501 -10,000 ft

(2286 - 3048m)

14A47 14A50

-070 14A55 14A56

-090 14A54 14A53

*11K51 73W37 *11K46

-110 14A46 14A51

* 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).

Page 57

Page 58

Testing of Non-Direct Vent Applications for Proper Venting and Sufficient Combus tion Air

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 monox ide 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 con nected to the venting system are not in operation.

After the EL296DFV 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 EL296DFV as well as to other gas‐fired appliances which are separately vented.

If a EL296DFV 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.

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.

1 - Seal any unused openings in the venting system. 2 - Visually inspect the venting system for proper size and

horizontal pitch. Determine there is no blockage or re striction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.

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

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. 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. 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.

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.

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.

Other Unit Adjustments

NOTE - See troubleshooting flow charts if any safety switches are found to be open.

Primary Limit.

The primary limit is located on the heating compartment vestibule panel. This limit is factory set and requires no ad justment.

Flame Rollout Switches (Two)

These manually reset switches are located on the front of the burner box.

Pressure Switch

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.

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.

Electrical

1 - Check all wiring for loose connections. 2 - Check for the correct voltage at the furnace (furnace

operating). Correct voltage is 120VAC +

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

cess panel in place. Motor Nameplate__________Actual__________

Exhaust and Air Intake Pipe

1 - Check exhaust and air intake connections for tightness

and to make sure there is no blockage.

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.

10%

Page 58

Page 59

Heating Sequence of Operation

Electronic Ignition

The two-stage, variable speed integrated control used in EL296DFV 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.

NOTE - The ignition control thermostat selection DIP switch is factory-set in the “TWO-STAGE” position.

Applications Using a Two-Stage Thermostat

See figure 61 for ignition control sequence

A - Heating Sequence -- Integrated Control Thermostat Selection DIP Switch 1 OFF in “Two-Stage” Position (Factory Setting)

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.

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.

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..

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.

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.

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.

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.

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

plete, the inducer and the HUM contacts are de-ener gized. The indoor blower is de-energized at the end of the off delay as well as the 120V ACC terminals.

Applications Using A Single-Stage Thermostat

See figure 62 for ignition control sequence

B - Heating Sequence -- Integrated Control Thermostat Selection DIP Switch 1 ON in “Single-Stage” Position

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

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.

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 integrated control also initiates a second-stage on delay (factory-set at 7 minutes; ad justable 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.

Page 59

Page 60

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.

HEATING OPERATION WITH TWO-STAGE THERMOSTAT

OFF

1 stg heat demand

low speed CAI ignitor

low fire gas valve

indoor blower low heat

Pre-Purge

Ignitor Warm-up

Trial For Ignition

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

plete, the inducer and the HUM contacts are de-ener gized. The indoor blower is de-energized at the end of the off delay as well as the 120V ACC terminals.

30* second

“on” delay

blower

5 SEC80

Post

Purge

blower

“off”

delay

2 stg heat demand high speed CAI high fire gas valve

indoor blower high heat

* Conventional thermostat 30 seconds, icomfort Touch® thermostat set for 30 adjustable 15 to 45 seconds.

30 seconds

FIGURE 61

HEATING OPERATION WITH SINGLE STAGE THERMOSTAT

351

Trial For Ignition

OFF

heat demand

low speed CAI ignitor

low fire gas valve

indoor blower low heat

7 or 12 minutes after heating demand begins, furnace switches to high fire (depending on setting)

high speed CAI high fire gas valve

indoor blower high heat

* Conventional thermostat 30 seconds, icomfort Touch® thermostat set for 30 adjustable 15 to 45 seconds.

Pre-Purge

Ignitor Warm-up

FIGURE 62

Service

WARNING

ELECTRICAL SHOCK, FIRE,

OR EXPLOSION HAZARD.

Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous opera tion, serious injury, death, or property damage. Before servicing, disconnect all electrical power to furnace. When servicing controls, label all wires prior to dis connecting. Take care to reconnect wires correctly. Verify proper operation after servicing.

Annual Furnace Maintenance

At the beginning of each heating season, and to comply with the Lennox Limited Warranty, your system should be checked as follows:

RECOGNITION PERIOD

30* second

blower

“on” delay

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.

1- Check wiring for loose connections, voltage at indoor

unit and amperage of indoor motor

2- Check the condition of the belt and shaft bearings if ap

plicable.

3- Inspect all gas pipe and connections for leaks

4- Check the cleanliness of filters and change if necessary

(monthly).

5 Check the condition and cleanliness of burners and

heat exchanger and clean if necessary.

WARNING

5 SEC80

Post

Purge

blower

“off”

delay

Page 60

Page 61

6 Check the cleanliness of blower assembly and clean

the housing, blower wheel and blower motor if neces sary

7- Inspect the condensate drain and trap for leaks and

cracks. The drain and trap must also be cleaned and the trap must be primed with water. Inspect the rubber hoses connected to the pressure switches for cracks or loose connections, replace as necessary. Remove the rubber hoses from the cold end header box and inspect for any blockage, clean as needed. If strainers are in stalled in the hoses remember to remove and clean be fore reinstalling the hoses.

8- Evaluate the heat exchanger integrity by inspecting the

heat exchanger per the AHRI heat exchanger inspec tion procedure. This procedure can be viewed at www.ahrinet.org

9- Ensure sufficient combustion air is available to the fur

nace. Fresh air grilles and louvers (on the unit and in the room where the furnace is installed) must be properly sized, open and unobstructed to provide combustion air

10 Inspect the furnace intake and exhaust pipes to make

sure they are in place, structurally sound, without holes, blockage or leakage and the exhaust pipe is sloped to ward the furnace. Inspect terminations to ensure they are free of obstructions and are structurally sound.

Inspect the furnace return air duct connection to ensure the duct is sealed to the furnace. Check for air leaks on supply and return ducts and seal where necessary

11 Inspect the furnace return air duct connection to ensure

the duct is sealed to the furnace. Check for air leaks on supply and return ducts and seal where necessary

12 Check the condition of the furnace cabinet insulation

and repair if necessary.

13 Perform a complete combustion analysis during the fur

nace inspection to ensure proper combustion and oper ation. Consult Service Literature for proper combustion values.

14 Verify operation of CO detectors and replace batteries

as required.

Perform a general system test. Turn on the furnace to check operating functions such as the start-up and shut-off operation.

1 - Check the operation of the ignition system, inspect

and clean flame sensor. Check microamps before and after. Check controls and safety devices (gas valve, flame sensor, temperature limits). Consult Service

Manual for proper operating range. Thermal Limits should be checked by restricting airflow and not dis connecting the indoor blower. For additional details, please see Service and Application Note H049.

2 - Verify that system total static pressure and airflow set

tings are within specific operating parameters.

3 - Clock gas meter to ensure that the unit is operating at

the specified firing rate for each stage of operation. Check the supply pressure and the manifold pressure on both low fire and high fire. If manifold pressure ad justment is necessary, consult the Service Literature for unit specific information on adjusting gas pressure. Not all gas valves are adjustable. Verify correct tem perature rise.

Winterizing and Condensate Trap Care

1 - Turn off power to the furnace.

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

3 - Remove the clean out cap from the condensate trap

and empty water. Inspect the trap then reinstall the drain plug.

Cleaning the Burner Assembly (if needed)

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

Remove upper and lower furnace access panels. 2 - Disconnect the 2-pin plug 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. 5 - -Loosen clamps and remove combustion air intake

flexible connector (if equipped). 5 - Mark and disconnect sensor wire from the sensor. Dis

connect plug from the ignitor at the burner box. 6 - Remove four screws which secure burner box assem

bly to vest panel. Remove burner box from the unit. 7 - 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. 8 - Reinstall the burner box assembly using the existing

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

center of the burner ports. 9 - Reconnect the sensor wire and reconnect the 2-pin

plug to the ignitor wiring harness. 10 - Reinstall combustion air intake flexible connector (if

equipped), secure using existing clamps. 11 - Reinstall the gas valve manifold assembly. Reconnect

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

er box cover. 12 - Reconnect plug 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. 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. 16 - Replace access panel.

Page 61

Page 62

Program Unit Capacity/Size Mode

Power-Up - Number displayed represents by integrated control unit size code (furnace model

and capacity). If three horizontal bars are displayed followed by continuous E203, furnace control does not recognize unit size code. Configure per the following:

Yes

To enter Program Unit Capacity/Size: push and hold button next to 7-segment LED display until solid “P” symbol appears. Release button.

IMPORTANT: Field replacement controls may need to be manually configured to validate furnace unit size code.

Solid P starts blinking on 7-Segment LED

Furnace control in IDLE mode

No heating, cooling or indoor fan

operation)

UNIT SIZE

CODE

−

Turn room thermostat to OFF

FURNACE MODEL

EL296UH045V36B

EL296UH070V36B

EL296UH090V36B

EL296UH09048C

EL296UH090V60C

EL296UH110V48C

EL296UH110V60C

EL296UH135V60D

UNIT SIZE

CODE

FURNACE MODEL

EL296DF0450V36A

EL296DF070V48B

EL296DF090V60C

EL296DF110V60C

Push and hold button. Integrated control will display unit size code number for each furnace model for three seconds.

When the correct unit size code is displayed, release button. Selected code will flash for 10-second period. During that period, press and hold push button for 5 seconds. Integrated control will store code in memory and will automatically exit Program Unit Capacity/Size Mode and reset. (If second period expires or push button is held less than five seconds, control will automatically exit Program Capacity/Size Mode and go into IDLE mode without storing unit size code. If this happens, programming function must be repeated).

−

. If

−

Verify that the selected unit size code is correct and stored in non-volatile memory by cycling the 24 volt power to the furnace control. (At 24 volt power-up of the furnace control, the 7-segment LED will display a unit size code three horizontal bars display, board does not recognize unit size code function must be repeated)

. Programming

FINISHED

Page 62

Page 63

Requirements for Commonwealth of Massachusetts

Modifications to NFPA-54, Chapter 10

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:

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.

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.

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.

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.

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.”

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.

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.

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

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

venting system.

MANUFACTURER REQUIREMENTS GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED.

When the manufacturer of Product Approved 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:

1 - The referenced “special venting system” instructions

shall be included with the appliance or equipment

installation instructions; and

2 The “special venting systems” shall be Product Ap

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

tem shall include a parts list and detailed installation

instructions.

A copy of all installation instructions for all Product Approved side wall, horizontally vented, gas-fueled equipment, all venting instructions, all parts lists for venting instructions, and/or all venting design instruc tions shall remain with the appliance or equipment at the completion of the installation.

Page 63

Page 64

Repair Parts List

The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA nameplate -- Example: EL296DFV04536B. All service must be performed by a licensed pro

fessional installer (or equivalent), service agency, or gas supplier.

Cabinet Parts

Outer access panel Blower access panel Top Cap

Control Panel Parts

Transformer Integrated control board Door interlock switch

Blower Parts

Blower wheel Motor Motor mounting frame

Heating Parts

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 Motor capacitor Blower housing cutoff plate

FOR THE PROVINCE OF ONTARIO, HORIZONTAL SIDEWALL VENT APPLICATIONS ONLY

For exterior horizontal venting applications, the 2” X 1.5” reducer for 2” venting at the point where the exhaust pipe exits the structure is not required in direct or nondirect vent applications in the Province of Ontario. In these applica tions, the vent should be oriented such that the exhaust

plume is unobjectionable. If the installation requires more separation between the flue gases and the building struc ture, a reducer may be installed on the exhaust pipe to in crease the flue gas velocity.

ADDENDUM FOR THE PROVINCE OF SASKATCHEWAN

See below for venting in the province of Saskatchewan. Lennox approves the following termination for use in Saskatchewan Canada.

3” (76MM)

Vent Pipe

6” (152 mm) Min. 24” (610 mm) Max.

6” (152 mm) Max.

A − Clearance above grade or

average snow accumulation

B − Horizontal separation between

intake and exhaust

C − Exhaust pipe length

D − Wall support distance from top

of each pipe (intake/exhaust)

NOTE − Flue gas may be acidic and may adversely affect some building materials. If flue gases impinge on the building materials, a corrosion−resistant shield should be used to protect the wall surface. 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.

2” (51MM)

Vent Pipe

12” (305 mm) Min. 12” (305 mm) Min.

6” (152 mm) Min. 24” (610 mm) Max.

Per: Saskatchewan Code of Practice

6” (152 mm) Max.

12”

Page 64

Lennox EL296DFV, ELITE, EL296DFXV045P36B, EL296DFXV110P60C, EL296DFXV070P48B Installation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual