Lennox EL296UHV Installation Instructions Manual

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Page 1

INSTALLATION

 2014 Lennox Industries Inc.

Dallas, Texas, USA

INSTRUCTIONS EL296UHV

ELITE UPFLOW / HORIZONTAL AIR DISCHARGE

507264-01 07/2014 Supersedes 05/2014

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.

AIR FLOW

HORIZONTAL LEFT

UPFLOW

AIR FLOW

HORIZONTAL RIGHT

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

EL296UHV Gas Furnace 3.........................

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

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

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

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

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

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

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

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

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

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

NOTICE

A thermostat is not included and must be ordered separately.

 The Lennox icomfort Wi-Fi

used in communicating applications.

 In non-communicating applications, the Lennox

ComfortSense well as other non-communicating thermostats.

In all cases, setup is critical to ensure proper system operation.

Field wiring for both communicating and non-com municating applications is illustrated in diagrams, which begin on Page 41.

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

Gas Piping 36.....................................

Electrical 39.......................................

Integrated Control 48...............................

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

Unit Start Up 57....................................

Gas Pressure Measurement 58......................

Proper Combustion 59..............................

High Altitude 59....................................

Repair Parts List 60................................

Testing For Sufficient Combustion Air Non-Direct Vent 60

Sequence of Operation 61..........................

Service 63........................................

Program Unit Capacity Size Mode 64.................

7000 thermostat may be used, as

thermostat must be

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EL296UHV Unit Dimensions - inches (mm)

)

EXHAUST AIR

NOTE − 60C and 60D size units that require air volumes 1800 cfm or over (850 L/s) must have one of the following

1. Single side return air with transition, to accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) cleanable air

filter. Required to maintain proper air velocity.

2. Single side return air with optional Return Air Base

3. Bottom return air.

4. Return air from both sides.

5. Bottom and See Blower Performance

Optional External Side Return Air Filter Kit is not for use

one side return air.

tables for additional information.

with the optional Return Air Base.

A B

9/16 (14)

OPTIONAL

SIDE RETURN

AIR FILTER KIT

(Either Side)

14−3/4

(375)

(406)

(838)

COMBUSTION

AIR INTAKE

OPTIONAL

SIDE RETURN

AIR FILTER KIT

(Either Side)

1−1/2 (38)

Front Panel

6−9/16 (167)

9 (229)

12−5/8 (321) (Either Side)

ELECTRICAL

INLET

(Either Side)

1−7/8 (48)

Left

Right

3−1/4

(83)

OUTLET

23−3/4

(603)

TOP VIEW

27−3/4

(705)

2 (51) (Either Side)

GAS PIPING INLET

(Either Side)

CONDENSATE TRAP CONNECTION (Either Side)

6−1/2 (165) (Either Side)

(584)

Side Return Air Opening (Either Side)

SUPPL Y AIR

OPENING

(635)

19−7/16

(494)

(356)

9/16

(14

1−1/

(38)

AIR FLOW

3/4

(19)

Bottom Return

Air Opening

3/4

(19)

FRONT VIEW SIDE VIEW

Model No.

in. mm in. mm in. mm

EL296UH045XV36B

EL296UH070XV36B

17−1/2 446 16−3/8 416 16 406 7−5/8 194

EL296UH090XV36C EL296UH090XV48C

EL296UH090XV60C EL296UH110XV48C

21 533 19−7/8 505 19−1/2 495 9−3/8 238

EL296UH110XV60C

EL296UH135XV60D

24−1/2 622 23−3/8 594 23 584 11−1/8 283

1−15/16 (49)

5/8

(16)

3−1/4

(83)

23−1/2

(597)

Bottom Return

Air Opening

ABCD

mm in.

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EL296UHV Gas Furnace

Shipping and Packing List

The EL296UHV Category IV gas furnace is shipped ready for installation in the upflow or horizontal position. The fur nace is shipped with the bottom panel in place. The bottom panel must be removed if the unit is to be installed in hori zontal or upflow applications with bottom return air.

The EL296UHV can be installed as either a Direct Vent or a Non-Direct Vent gas central furnace.

The furnace is equipped for installation in natural gas ap plications. A conversion kit (ordered separately) is required for use in propane/LP gas applications.

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 involving roof termination.

DIRECT VENT INSTALLATION NON-DIRECT VENT

EXHAUST OUTLET

COMBUSTION

AIR INTAKE OUTSIDE

OF HOUSE

INSTALLATION

EXHAUST

OUTLET

Package 1 of 1 contains

1 - Assembled EL296UHV unit 1 - Bag assembly containing the following:

1 - Snap bushing 1 - Snap plug 1 - Wire tie 1 - Condensate trap 1 - Condensate trap cap 1 - Condensate trap clamp 1 - 2” diameter debris screen

1 - 3/4” Threaded street elbow 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 - Return air base kit 1 - Horizontal suspension kit 1 - High altitude pressure switch

Safety Information

FIGURE 1

NON-DIRECT VENT

INSTALLATION

EXHAUST OUTLET

COMBUSTION

AIR INTAKE INSIDE

VENTILATED

ATTIC SPACE

FIGURE 2

COMBUSTION

AIR INTAKE

OF HOUSE

NON-DIRECT VENT

INSTALLATION

EXHAUST OUTLET

COMBUSTION

AIR INTAKE INSIDE

VENTILATED

CRAWL SPACE

INSIDE

CAUTION

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

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.

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

EL296UHV 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 local building codes. In the absence of local codes, units must be installed according to the current National Fuel Gas Code (ANSI‐Z223.1/NFPA 54). The National Fuel Gas Code is available from the following address:

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.

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

Heating Unit Installed Parallel to Air Handler Unit

Dampers

(open during heating operation only)

Installation Locations

This furnace is CSA International certified for installation clearances to combustible material as listed on the unit nameplate and in the table in figure 12. Accessibility and service clearances must take precedence over fire protec tion clearances.

NOTE - For installation on combustible floors, the furnace shall not be installed directly on carpeting, tile, or other combustible material other than wood flooring.

For installation in a residential garage, the furnace must be installed so that the burner(s) and the ignition source are located no less than 18 inches (457 mm) above the floor. The furnace must be located or protected to avoid physical damage by vehicles. When a furnace is installed in a public garage, hangar, or other building that has a hazardous at mosphere, the furnace must be installed according to rec ommended good practice requirements and current Na tional 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. Fail ure to do so may cause erratic limit operation and prema ture heat exchanger failure.

This EL296UHV furnace must be installed so that its electrical components are protected from water.

Installed in Combination with a Cooling Coil

When this furnace is used with cooling coils (figure 3), it shall be installed in parallel with, or on the upstream side of, cooling coils 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 either the heating or the cooling unit, unless it is in the full HEAT or COOL setting.

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

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

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

Gas Unit

AIR FLOWAIR FLOW

Air Handler Unit

Dampers

(open during cooling operation only)

Heating Unit Installed Upstream of Cooling Coil

AIR FLOW AIR FLOW

Cooling Coil

Gas Unit

FIGURE 3

NOTE - This furnace is designed for a minimum continuous return air temperature of 60°F (16°C) or an intermittent op eration down to 55°F (13°C) dry bulb for cases where a night setback thermostat is used. Return air temperature must not exceed 85°F (29°C) dry bulb.

The EL296UHV furnace may be installed in alcoves, clos ets, attics, basements, garages, crawl spaces and utility rooms in the upflow or horizontal position.

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

Use of Furnace as Construction Heater

Lennox does not recommend the use of EL296UHV 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.

EL296UHV units may be used for heating of buildings or structures under construction, if the following conditions are met:

D The vent system must be permanently installed per

these installation instructions.

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

fixed jumpers that will provide continuous heating is not allowed.

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

furnace.

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

80°F (27°C) must be maintained.

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

maintained during construction.

D Air filters must be replaced upon construction comple

tion.

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

furnace rating plate.

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

vided for combustion air requirements during construc tion. Temporary ducting may supply outdoor air to the furnace. Do not connect duct directly to the furnace. Size the temporary duct following these instructions in section for Combustion, Dilution and Ventilation Air in a confined space with air from outside.

D The furnace heat exchanger, components, duct sys

tem, air filters and evaporator coils must be thoroughly cleaned following final construction clean-up.

D 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 EL296UHV furnace:

• Place the furnace as close to the center of the air dis tribution system as possible. The furnace should also be located close to the vent termination point.

• When the furnace is installed in non-direct vent applica tions, do not install the furnace where drafts might blow directly into it. This could cause improper combustion and unsafe operation.

• 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.

• Please consult the manufacturer of your evaporator coil for their recommendations on distance required between the heat exchanger and their drain pan. Ad equate space must be provided between the drain pan and the furnace heat exchanger.

CAUTION

EL296UHV unit should not be installed in areas nor mally subject to freezing temperatures.

WARNING

The State of California has determined that this prod uct may contain or produce a chemical or chemicals, in very low doses, which may cause serious illness or death. It may also cause cancer, birth defects or reproductive harm.

WARNING

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

Combustion, Dilution & Ventilation Air

If the EL296UHV 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.

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 prac tices make it necessary to bring in air from outside for com bustion. Take into account that exhaust fans, appliance vents, chimneys, and fireplaces force additional air that could be used for combustion out of the house. Unless out side air is brought into the house for combustion, negative pressure (outside pressure is greater than inside pressure) will build to the point that a downdraft can occur in the fur nace vent pipe or chimney. As a result, combustion gases enter the living space creating a potentially dangerous situ ation.

In the absence of local codes concerning air for combustion and ventilation, use the guidelines and procedures in this section to install EL296UHV furnaces to ensure effi cient and safe operation. You must consider combustion air needs and requirements for exhaust vents and gas pip

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ing. A portion of this information has been reprinted with permission from the National Fuel Gas Code (ANSIZ223.1/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 en tirety.

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 ex haust fans which force air out of the house. When fire places, exhaust fans, or clothes dryers are used at the same time as the furnace, much more air is required to en sure proper combustion and to prevent a downdraft. Insuf ficient 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.

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

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

) per 1,000 Btu (.29 kW) per hour of the com bined input rating of all appliances installed in that space. This space also includes adjacent rooms which are not separated by a door. Though an area may appear to be 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 cu bic feet (1.42 m

) per 1,000 Btu (.29 kW) per hour of the com-bined input rating of all appliances installed in that space. This definition includes furnace closets or small equipment rooms.

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 all equipment in the enclosure, but not less than 100 square inches (64516mm.

2).

EL296UH

per .29kW) per hour of the total input rating of

(To Adjacent

Unconfined

Space)

FIGURE 4

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 verti cal ducts. Each opening shall have a minimum 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 minimum free area of 1 square

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inch per 2,000 Btu (645mm

per .59kW) per total input rat ing of all equipment in the enclosure (See figure 5). It is also permissible to bring in air for combustion from a ventilated attic (figure 6) or ventilated crawl space (figure 7).

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

EQUIPMENT IN CONFINED SPACE

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE

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

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.

FURNACE

INLET

AIR

FIGURE 5

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

Roof T erminated

Exhaust Pipe

EQUIPMENT IN CONFINED SPACE

Ventilation Louvers

Inlet Air

(Minimum

12 in.(305mm) Abov

attic floor)

*Intake Debris

Screen

(Provided)

Furnace

* See table 6 for maximum vent lengths

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

per 1.17kW) per

FIGURE 6

Roof T erminated

Exhaust Pipe

Inlet Air

(Minimum

Ventilation

Louvers

(Crawl space)

Coupling or 3 in. to 2 in.

Transition

(Field Provided)

Furnace

12 in.(305mm)

Above crawl

space floor)

*Intake Debris Screen Provided)

* See table 6 for maximum vent lengths

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm 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 communicate di rectly or by ducts with the outdoors or spaces (crawl or at tic) that freely communicate with the outdoors or indirectly 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 en closure. See figures 5 and 8. When communicating with the outdoors through horizontal ducts, each opening shall

have a minimum free area of 1 square inch (645 mm

) per

2,000 Btu (.56 kW) per total input rating of all equipment in the enclosure. See figure 9. When ducts are used, they shall be of the same cross-sec tional area as the free area of the openings to which they connect. The minimum dimension of rectangular air ducts shall be no less than 3 inches (75 mm). In calculating free area, the blocking effect of louvers, grilles, or screens must be considered. If the design and free area of protective cov ering is not known for calculating the size opening required, it may be assumed that wood louvers will have 20 to 25 per cent 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 opera tion.

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EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE

ROOF TERMINATED

EXHAUST PIPE

(All Air Through Ventilated Attic)

VENTILATION LOUVERS

(Each end of attic)

OUTLET

AIR

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.

EL296 Furnaces with

1/2 HP Blower Motor

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

FURNACE

INLET AIR

(Ends 12” above

bottom)

per 1.17kW) per hour

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.

FURNACE

INLET AIR

per .59kW) per hour of the total

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

RIGID LEG

(Remove shipping bolt

and washer)

FIGURE 10

Installation - Setting Equipment

WARNING

Do not connect the return air duct to the back of the furnace. Doing so will adversely affect the operation of the safety control devices, which could result in personal injury or death.

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.

Upflow Applications

The EL296UHV gas furnace can be installed as shipped in the upflow position. Refer to figure 12 for clearances. Se lect a location that allows for the required clearances that are listed on the unit nameplate. Also consider gas supply connections, electrical supply, vent connection, conden sate trap and drain connections, and installation and ser vice clearances [24 inches (610 mm) at unit front]. The unit

must be level from side to side. The unit may be positioned from level to ½” toward the front. See figure 11.

Allow for clearances to combustible materials as indicated on the unit nameplate.

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SETTING EQUIPMENT

UPFLOW APPLICATION

UNIT

FRONT

SIDE VIEW

AIR FLOW

FRONT VIEW

UNIT

FRONT

AIR FLOW

SIDE VIEW

1/2”

max.

HORIZONTAL APPLICATION

UNIT

FRONT

FRONT VIEW

AIR FLOW

END VIEW

1/2”

max.

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

FIGURE 11

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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.

Installation Clearances

Top

Return Air Guidelines

Return air can be brought in through the bottom or either side of the furnace installed in an upflow application. If the furnace is installed on a platform with bottom return, make an airtight seal between the bottom of the furnace and the platform to ensure that the furnace operates properly and safely. The furnace is equipped with a removable bottom panel to facilitate installation.

Markings are provided on both sides of the furnace cabinet for installations that require side return air. Cut the furnace cabinet at the maximum dimensions shown on page 2.

Refer to Engineering Handbook for additional information.

EL296UHV applications which include side return air and a condensate trap installed on the same side of the cabinet (trap can be installed remotely within 5 ft.) re quire either a return air base or field-fabricated transi tion to accommodate an optional IAQ accessory taller than 14.5”. See figure 13.

Left Side

Bottom (Floor)

Top/Plenum 1 in. (25 mm)

*Front 0

Back 0

Sides 0†

Vent 0

Floor 0‡

*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access.

†Allow proper clearances to accommodate condensate trap. ‡For installations on a combustible floor, do not install the fur

nace directly on carpeting, tile or other combustible materials oth er than wood flooring.

Right Side

FIGURE 12

Side Return Air

(with transition and filter)

20” X 25” X 1”

(508mmX635mmX25mm)

1−1/2”

Air Filter

Return

Air

Plenum

Transition

FIGURE 13

Page 10

Page 11

)

FURNACE

FRONT

Optional Return Air Base

(Upflow Applications Only)

23 (584)

Overall

(Maximum)

Unit side return air

Opening

5−5/8 (143)

SIDE RETURN

AIR OPENINGS

(Either Side)

26−7/8

(683)

SIDE VIEW

(584)

Minimum

11 (279)

Maximum

14 (356)

22−7/16

(570)

Overall

(Maximum

3/4

(19)

AIR FLOW

17−1/2 (446) B Width (50W98) 21 (533) C Width (50W99)

24−1/2 (622) D Width (51W00)

INDOOR AIR

QUALITY CABINET

(PCO, Filter

Cabinet, etc.)

OPTIONAL RETURN AIR BASE

IF BASE IS USED

WITHOUT

IAQ CABINET,

A SINGLE

RETURN AIR

PLENUM

MUST

COVER BOTH

UNIT AND

RETURN

AIR BASE

OPENINGS

3−1/4

(83)

7−1/4

(184)

FRONT VIEW

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

Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet. Minimum unit side return air opening dimensions for units requiring 1800 cfm of air and over (W x H): 23 x 11 in. (584 x 279 mm). The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown. Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air opening. The size of the opening must not extend beyond the markings on the furnace cabinet.

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

FIGURE 14

Removing the Bottom Panel

Remove the two screws that secure the bottom cap to the furnace. Pivot the bottom cap down to release the bottom panel. Once the bottom panel has been removed, reinstall the bottom cap. See figure 15.

Horizontal Applications

Screw

Bottom Cap

Bottom Panel

FIGURE 15

Page 11

WARNING

Do not install the furnace on its front or back. See figure 16.

Front

FIGURE 16

Back

Page 12

The EL296UHV furnace can be installed in horizontal ap plications with either right- or left-hand air discharge. Refer to figure 17 for clearances in horizontal applications.

Horizontal Application

Installation Clearances

HORIZONTAL SUSPENSION KIT

Metal Strap

(typical)

Internal Brace

(provided with kit)

Right-Hand Discharge

Left End Right End

Air

Flow

Bottom (Floor)**

Left-Hand Discharge

Top

Left End Right End

Air

Flow

Bottom (Floor)**

Top 0

Front* 0

Back 0

Ends 0

Vent 0

Floor 0‡

*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. **An 8” service clearance must be maintained below the unit to provide for servicing of the condensate trap. ‡For installations on a combustible floor, do not install the fur nace directly on carpeting, tile or other combustible materials oth er than wood flooring.

Air

Flow

Air

Flow

FIGURE 17

Suspended Installation of Horizontal Unit

This furnace may be installed in either an attic or a crawl space. Either suspend the furnace from roof rafters or floor joists, as shown in figure 18, or install the furnace on a plat form, as shown in figure 19. A horizontal suspension kit (51W10) may be ordered from Lennox or use equivalent.

NOTE - Heavy-gauge sheet metal straps may be used to suspend the unit from roof rafters or ceiling joists. When straps are used to suspend the unit in this way, support must be provided for both the ends. The straps must not in terfere with the plenum or exhaust piping installation. Cool

ing coils and supply and return air plenums must be supported separately.

Bracket (typical)

Air

Flow

FIGURE 18

NOTE - When the furnace is installed on a platform or with the horizontal suspension kit in a crawlspace, it must be elevated enough to avoid water damage, accommodate drain trap and to allow the evaporator coil to drain.

Platform Installation of Horizontal Unit

1 - Select location for unit keeping in mind service and

other necessary clearances. See figure 17.

2 - Construct a raised wooden frame and cover frame

with a plywood sheet. If unit is installed above finished space, install an an auxiliary drain pan under unit. Set unit in drain pan as shown in figure 19. Leave 8 inches for service clearance below unit for condensate trap.

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

ling the unit in a crawl space, a proper support platform may be created using cement blocks.

4 - Route auxiliary drain line so that water draining from

this outlet will be easily noticed by the homeowner.

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

sate pump to meet drain line slope requirements. The pump must be rated for use with condensing furnaces. Protect the condensate discharge line from the pump to the outside to avoid freezing.

6 - Continue with exhaust, condensate and intake piping

installation according to instructions.

Page 12

Page 13

INTAKE PIPE

EXHAUST PIPE

*Gas connector may be used for Canadian installation if accept able by local authority having jurisdiction.

SERVICE PLATFORM

*GAS CONNECTION

RAISED

PLATFORM

FIGURE 19

Return Air -- Horizontal Applications

Return air may be brought in only through the end of a fur nace installed in the horizontal position. The furnace is equipped with a removable bottom panel to facilitate instal lation. See figure 15.

Filters

This unit is not equipped with a filter or rack. A field-pro vided high velocity rated filter is required for the unit to oper ate properly. Table 1 lists recommended filter sizes. A filter must be in place whenever the unit is operating.

IMPORTANT

If a highefficiency filter is being installed as part of this system to ensure better indoor air quality, the fil ter must be properly sized. Highefficiency filters have a higher static pressure drop than standardef ficiency glass/foam filters. If the pressure drop is too great, system capacity and performance may be re duced. The pressure drop may also cause the limit to trip more frequently during the winter and the indoor coil to freeze in the summer, resulting in an increase in the number of service calls.

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 1

Furnace

Cabinet Width

17-1/2” 16 X 25 X 1 (1) 16 X 25 X 1 (1)

21” 16 X 25 X 1 (1) 20 X 25 X 1 (1)

24-1/2” 16 X 25 X 1 (2) 24 X 25 X 1 (1)

Side Return Bottom Return

Filter Size

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.

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.

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 pressure is created in the room. If a gas appliance is operating in a room with negative pressure, the flue products can be pulled back down the vent pipe and into the room. This 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 throughout the house by the furnace duct system.

Return air can be brought in through the bottom or either side of the furnace (return air brought into either side of fur nace allowed only in upflow applications). If a furnace with bottom return air is installed on a platform, make an airtight seal between the bottom of the furnace and the platform to ensure that the unit operates properly and safely. Use fi berglass sealing strips, caulking, or equivalent sealing method between the plenum and the furnace cabinet to en sure 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 2 below for approved piping and fitting ma terials.

Page 13

Page 14

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.

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

PolyPro by Duravent

TABLE 2

D2661

D2665

ASTM

SPECIFICATION

D2564, D2235, F493

D3138

MARKING

ULCS636

ULC-S636

IMPORTANT

EL296UHV exhaust and intake connections are made of PVC. Use PVC primer and solvent cement when using PVC vent pipe. When using ABS vent pipe, use transitional solvent cement to make con nections to the PVC fittings in the unit.

Use PVC primer and solvent cement or ABS solvent ce ment meeting ASTM specifications, refer to Table 2. As an alternate, use all purpose cement, to bond ABS, PVC, or CPVC pipe when using fittings and pipe made of the same materials. Use transition solvent cement when bonding ABS to either PVC or CPVC.

Low temperature solvent cement is recommended during cooler weather. Metal or plastic strapping may be used 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 appliance must be certified to ULC S636 and supplied by a single manufacturer as part of an approved vent (exhaust) sys tem. In addition, the first three feet of vent pipe from the fur nace flue collar must be accessible for inspection.

Page 14

Page 15

Vent

Input Size

Pipe

Dia. in.

045

2-1/2

070

2-1/2

090

2-1/2

2 YES YES YES

110

2-1/2 YES YES

3 YES YES

135 3 YES

OUTDOOR TERMINATION USAGE*

TABLE 3

STANDARD CONCENTRIC

Flush Mount

Kit

2 inch 3 inch 2 inch

51W11

(US)

51W12

22G44 (US)

30G28 (CA)

(CA)

YES YES

YES YES YES

Wall Kit Wall Ring Kit

44J40

(US)

81J20 (CA)

YES

15F74

YES

1-1/2 inch 2 inch 3 inch

Field

Fabricated

YES

YES 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, 44W93 and 81J20 are certified to ULC S636 for use in Canada only.

See table 8 for vent accelerator requirements.

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

Joint Cementing Procedure

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

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.

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.

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

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

side socket surface of fitting. Cement should be ap plied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply second coat to end of pipe.

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

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

Page 15

Page 16

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 indicate an improper assembly due to insufficient solvent.

9 - Handle joints carefully until completely set.

Venting Practices

Piping Suspension Guidelines

SCHEDULE 40

PVC - 5'

all other pipe* - 3'

* See table 2 for allowable pipe.

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

NOTE - All horizontal runs of exhaust pipe must slope back to ward unit a minimum of 1/4” (6mm) drop for each 12” (305mm).

Wall Thickness Guidelines

24” maximum 3/4” minimum

inside outside

FIGURE 20

1 - In areas where piping penetrates joists or interior

walls, hole must be large enough to allow clearance on all sides of pipe through center of hole using a hanger.

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 prop erly vent the remaining attached appliances.

Wall

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 vent ing 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 horizon

tal pitch. Determine that there is no blockage, restric tion, 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.

Page 16

Page 17

CHIMNEY

OR GAS

VENT

(Check sizing

for water

heater only)

FURNACE

(Replaced by EL296)

REPLACING FURNACE THAT

WAS PART OF A COMMON

VENT SYSTEM

WATER

HEATER

OPENINGS

(To Adjacent

Room)

If an EL296UHV furnace replaces a furnace which was commonly vented with another gas appliance, the size of the existing vent pipe for that gas ap pliance must be checked. Without the heat of the original furnace flue products, the existing vent pipe is probably oversized for the single water heater or other appliance. The vent should be checked for proper draw with the remaining appliance.

FIGURE 21

Exhaust Piping (Figures 22, 24 and 25)

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

The EL296UHV 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 installa tions, combustion air is taken from outdoors and flue gases are discharged outdoors.

Intake and exhaust pipe sizing -- Size pipe according to

tables 4 and

5. Count all elbows inside and outside the

home. Table 4 lists the minimum vent pipe lengths per mitted. Table

5 lists the maximum pipe lengths permitted.

Regardless of the diameter of pipe used, the standard roof and wall terminations described in section Exhaust Piping Terminations should be used. Exhaust vent termination pipe is sized to optimize the velocity of the exhaust gas as it exits the termination. Refer to table 8.

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.

NOTE - The exhaust collar on all models is sized to accom modate 2” Schedule 40 vent pipe. In horizontal applica tions, any transition to exhaust pipe larger than 2” must be made in vertical runs of the pipe. Therefore a 2” elbow must be added before the pipe is transitioned to any size larger than 2”. This elbow must be added to the elbow count used to determine acceptable vent lengths. Contact the Applica tion Department for more information concerning sizing of vent systems which include multiple pipe sizes.

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.

Vent Piping Guidelines

NOTE - Lennox has approved the use of DuraVent® manu factured vent pipe and terminations as an option to PVC. When using the PolyPro vent pipe requirements stated in the unit installation in struction – minimum & maximum vent lengths, termination clearances, etc. – apply and must be followed. Follow the instructions provided with PoyPro by DuraVent venting system for assembly or if requirements are more restrict ive. The PolyPro by Duravent venting system must also fol low the uninsulated and unconditioned space criteria listed in table 7.

by DuraVent venting system the

Horizontal Installation Offset Requirements

Exhaust Pipe

Horizontal

12” Max.

Gas Furnace

NOTE - All horizontal runs of exhaust pipe must slope back to ward unit. A minimum of 1/4” (6mm) drop for each 12” (305mm) of horizontal run is mandatory for drainage.

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

NOTE - Exhaust piping should be checked carefully to make

sure there are no sags or low spots.

12” Min.

FIGURE 22

TABLE 4

MINIMUM VENT PIPE LENGTHS

EL296UHV

MODEL

045, 070, 090, 110, 135

*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

Page 17

Page 18

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 3.

Which needs

most elbows?

Intake or

exhaust?

How many elbows? Count all elbows inside and outside house.

IMPORTANT

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

Desired pipe size?

2”, 2-1/2”, 3”

What is the altitude of the furnace installation?

Use table 5 or 6 to find max intake or exhaust pipe length. Includes all vent pipe and elbows inside and outside the house.

FIGURE 23

Page 18

Page 19

Maximum Allowable Intake or Exhaust Vent Length in Feet

TABLE 5

NOTE - Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size. NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation.

Standard Termination at Elevation 0 - 4500 ft

Number Of 90° Elbows

Used

1 81 66 44 24

2 76 61 39 19 110 110 88 53 133 132 113 113 109

3 71 56 34 14 105 105 83 48 128 127 108 108 104

4 66 51 29

5 61 46 24 95 95 73 38 118 117 98 98 94

6 56 41 19 90 90 68 33 113 112 93 93 89

7 51 36 14 85 85 63 28 108 107 88 88 84

8 46 31

9 41 26 75 75 53 18 98 97 78 78 74

10 36 21 70 70 48 13 93 92 73 73 69

045 070 090 110 135 045 070 090 110 135 045 070 090 110 135

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

n/a

115 115 93 58

100 100 78 43 123 122 103 103 99

n/a

80 80 58 23 103 102 83 83 79

138 137 118 118 114

Standard Termination Elevation 4500 - 10,000 ft

Number Of 90° Elbows

Used

1 81 66 44

2 76 61 39 110 110 88 53 133 132 113 113 109

3 71 56 34 105 105 83 48 128 127 108 108 104

4 66 51 29 100 100 78 43 123 122 103 103 99

5 61 46 24 95 95 73 38 118 117 98 98 94

6 56 41 19 90 90 68 33 113 112 93 93 89

7 51 36 14 85 85 63 28 108 107 88 88 84

8 46 31

9 41 26 75 75 53 18 98 97 78 78 74

10 36 21 70 70 48 13 93 92 73 73 69

045 070 090 110 135 045 070 090 110 135 045 070 090 110 135

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

n/a

n/a n/a

115 115 93 58

n/a

80 80 58 23 103 102 83 83 79

138 137 118 118 114

See concentric terminations next page.

Page 19

Page 20

Maximum Allowable Intake or Exhaust Vent Length in Feet

TABLE 5 Continued

Size intake and exhaust pipe length separately. Values in table are for Intake OR Exhaust, not combined total. Both Intake and Exhaust must be same pipe size.

Concentric Termination at Elevation 0 - 4500 ft

Number Of 90° Elbows

Used

045 070 090 110 135 045 070 090 110 135 045 070 090 110 135

1 73 58 42 22

2 68 53 37 17 100 100 84 49 116 116 109 109 100

3 63 48 32 12 95 95 79 44 111 111 104 104 95

4 58 43 27

5 53 38 22 85 85 69 34 101 101 94 94 85

6 48 33 17 80 80 64 29 96 96 89 89 80

7 43 28 12 75 75 59 24 91 91 84 84 75

8 38 23

9 33 18 65 65 49 14 81 81 74 74 65

10 28 13 60 60 44 n/a 76 76 69 69 60

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

105 105 89 54

90 90 74 39 106 106 99 99 90

n/a

70 70 54 19 86 86 79 79 70

n/a

121 121 114 114 105

n/a

Concentric Termination Elevation 4501 - 10,000 ft

Number Of 90° Elbows

Used

045 070 090 110 135 045 070 090 110 135 045 070 090 110 135

1 73 58 42

2 68 53 37 100 100 84 49 116 116 109 109 100

3 63 48 32 95 95 79 44 111 111 104 104 95

4 58 43 27 90 90 74 39 106 106 99 99 90

5 53 38 22 85 85 69 34 101 101 94 94 85

6 48 33 17 80 80 64 29 96 96 89 89 80

7 43 28 12 75 75 59 24 91 91 84 84 75

8 38 23

9 33 18 65 65 49 14 81 81 74 74 65

10 28 13 60 60 44 n/a 76 76 69 69 60

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

105 105 89 54

n/a n/a

70 70 54 19 86 86 79 79 70

n/a

121 121 114 114 105

n/a

Page 20

Page 21

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

TABLE 6

Attic or Crawl Space For Intake Air in Feet

Standard Termination at Elevation 0 - 4500 ft

Number Of 90° Elbows

Used

1 71 56 34 14

2 66 51 29 9 95 95 73 38 113 112 93 93 89

3 61 46 24 4 90 90 68 33 108 107 88 88 84

4 56 41 19

5 51 36 14 80 80 58 23 98 97 78 78 74

6 46 31 9 85 75 63 18 93 92 73 73 69

7 41 26 4 70 70 48 13 88 87 68 68 64

8 36 21

9 31 16 60 60 38 3 78 77 58 58 54

10 26 11 55 55 33 n/a 73 72 53 53 49

045 070 090 110 135 045 070 090 110 135 045 070 090 110 135

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

n/a

100 100 78 43

85 85 63 28 103 102 83 83 79

n/a

65 65 43 8 83 82 63 63 59

118 117 98 98 94

Standard Termination Elevation 4500 - 10,000 ft

Number Of 90° Elbows

Used

1 71 56 34

2 66 51 29 95 95 73 38 113 112 93 93 89

3 61 46 24 90 90 68 33 108 107 88 88 84

4 56 41 19 85 85 63 28 103 102 83 83 79

5 51 36 14 80 80 58 23 98 97 78 78 74

6 46 31 9 85 85 53 18 93 92 73 73 69

7 41 26 4 70 70 48 13 88 87 68 68 64

8 36 21

9 31 16 60 60 38 3 78 77 58 58 54

10 26 11 55 55 33 n/a 73 72 53 53 49

045 070 090 110 135 045 070 090 110 135 045 070 090 110 135

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

n/a

n/a n/a

100 100 78 43

n/a

65 65 43 8 83 82 63 63 59

118 117 98 98 94

Page 21

Page 22

TYPICAL EXHAUST AND INTAKE PIPE CONNECTIONS IN UPFLOW DIRECT OR

NON-DIRECT VENT APPLICATIONS

EXHAUST

2”

INTAKE

2”

EXHAUST INTAKE

3”

TRANSITION

*2”

2”

3”

TRANSITION

*2”

2”

DO NOT transition

from smaller to larger

pipe in horizontal runs

of exhaust pipe.

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

FIGURE 24

2”

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

APPLICATIONS

12” max.

EXHAUST

2”

INTAKE

EXHAUST

*2”

(RIGHT HAND DISCHARGE SHOWN)

2”

3”

*2”

2”

TRANSITION

*2”

2”

3”

*2”

45°

MAX

2”

*2”

2”

SIDE VIEW

45°

MAX

DO NOT transition

from smaller to larger

pipe in horizontal runs

of exhaust pipe.

INTAKE

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

FIGURE 25

Page 22

Page 23

Intake Piping

The EL296UHV furnace may be installed in either direct vent or non-direct vent applications. In non-direct vent

applications, when intake air will be drawn into the furnace from the surrounding space, the indoor air quality must be considered and guidelines listed in Combustion, Dilution and Ventilation Air section must be followed.

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

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

1 - Use transition solvent cement or a sheet metal screw

to secure the intake pipe to the inlet air connector.

2 - Route piping to outside of structure. Continue with

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

5 for pipe sizes.

TYPICAL AIR INTAKE PIPE CONNECTIONS

HORIZONTAL NON−DIRECT VENT APPLICATIONS

(Horizontal Right−Hand Air Discharge Application Shown)

PVC pipe

coupling

INTAKE

DEBRIS

SCREEN

(Provided)

NOTE - Debris screen may be positioned straight out (preferred) or with an elbow rotated to face down.

TYPICAL AIR INTAKE PIPE CONNECTIONS

UPFLOW NON−DIRECT

VENT APPLICATIONS

INTAKE

DEBRIS

SCREEN

(Provided)

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

FIGURE 26

FIGURE 27

Follow the next two steps when installing the unit in Non‐ Direct Vent applications where combustion air is taken

from indoors or ventilated attic or crawlspace and flue gases are discharged outdoors.

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

air intake screen to route the intake piping as shown in figure 26 or 27. Maintain a minimum clearance of 3” (76mm) around the air intake opening. The air intake opening (with the protective screen) should always be directed forward or to either side in the upflow position, and either straight out or downward in the horizontal position.

The air intake piping must not terminate too close to the flooring or a platform. Ensure that the intake air inlet will not be obstructed by loose insulation or other items that may clog the debris screen.

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

or ventilated crawlspace (figure 29) the exhaust vent length must not exceed those listed in table 6. If 3” di ameter pipe is used, reduce to 2” diameter pipe at the termination point to accommodate the debris screen.

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

the connector, if desired.

Page 23

Page 24

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 Attic and Outlet Air to Outside)

Roof T erminated

Exhaust Pipe

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

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

Roof T erminated

Exhaust Pipe

EQUIPMENT IN CONFINED SPACE

Ventilation Louvers

(Minimum

12 in.(305mm) Abov

attic floor)

*Intake Debris

Screen

(Provided)

Furnace

* See table 6 for maximum vent lengths

per 1.17kW) per

FIGURE 28

EQUIPMENT IN CONFINED SPACE

Inlet Air

General Guidelines for Vent Terminations

In Non‐Direct Vent applications, combustion air is taken from indoors or ventilated attic or crawlspace and the flue gases are discharged to the outdoors. The EL296UHV is then classified as a non‐direct vent, Category IV gas fur nace.

In Direct Vent applications, combustion air is taken from outdoors and the flue gases are discharged to the out doors. The EL296UHV 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 ab sence of local codes, refer to the current National Fuel Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current CSAB149 Natural Gas and Propane Installation Codes in Can ada for details.

Position termination according to location given in figure 31 or 32. 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 7 for maximum allowed exhaust pipe length without insulation in unconditioned space during winter design temperatures below 32°F (0°C). If required exhaust pipe should be insulated with 1/2” (13mm) Arma flex or equivalent. In extreme cold climate areas, 3/4” (19mm) Armaflex or equivalent may be necessary. Insula tion 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.

Inlet Air

(Minimum

Ventilation

Louvers

(Crawl space)

Coupling or 3 in. to 2 in.

Transition

(Field Provided)

Furnace

12 in.(305mm)

Above crawl

space floor)

*Intake Debris Screen Provided)

* See table 6 for maximum vent lengths

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

FIGURE 29

per 1.17kW) per

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 24

Page 25

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

TABLE 7

Winter Design Temperatures Two - Stage High Efficiency Furnace

Winter Design

Temperatures

32 to 21

(0 to -6)

°F (°C)

Vent Pipe

Diameter

045 070 090 110 135

PVC

PP PVC2PP PVC

2 in. 20 18 30 28 40 36 24 24 N/A N/A

2-1/2 in. 15 N/A 22 N/A 30 N/A 40 N/A N/A N/A

Unit Input Size

PP PVC2PP PVC

3 in. 12 10 18 15 25 21 32 28 42 37

2 in 12 11 20 18 25 22 24 24 N/A N/A

20 to 1

(-7 to -17)

2-1/2 in. 10 N/A 14 N/A 20 N/A 24 N/A N/A N/A

3 in. 6 5 10 8 15 12 20 17 22 18

2 in. 8 7 12 11 18 16 22 20 N/A N/A

0 to -20

(-18 to -29)

2-1/2 in. 6 N/A 8 N/A 12 N/A 16 N/A N/A N/A

3 in. 2 1 6 5 10 10 12 11 15 12

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

Poly-Propylene vent pipe (PP)

NOTE - Maximum uninsulated vent lengths listed may include the termination(vent pipe exterior to the structure) and cannot exceed 5 linear feet or the maximum allowable intake or exhaust vent length listed in table 5 or 6 which ever is less.

NOTE - If insulation is required in an unconditioned space, it must be located on the pipe closest to the furnace. See figure30.

Conditioned

Space

Conditioned

Space

FIGURE 30

Pipe Insulation

Unconditioned

Space

Exhaust

Pipe

Intake

Pipe

Page 25

Page 26

VENT TERMINATION CLEARANCES

FOR NON-DIRECT VENT INSTALLATIONS IN THE US 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

D =

Vertical clearance to ventilated soffit

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 31

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 US 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

Vertical clearance to ventilated soffit

D =

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

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.

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

(3m) horizontally

* 7 feet (2.1m)

*12 inches (305mm)‡

FIGURE 32

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 taken from outdoors and flue gases are discharged to outdoors.

NOTE - Flue gas may be slightly acidic and may adversely affect some building materials. If any vent termination is used and the flue 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 41.

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 33 through 40 show typical terminations.

1 - Intake and exhaust terminations are not required to be

in the same pressure zone. You may exit the intake on one side of the structure and the exhaust on another side (figure 34). You may exit the exhaust out the roof and the intake out the side of the structure (figure 35).

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

33).

4 - Exhaust piping must terminate straight out or up as

shown. A reducer may be required on the exhaust pip ing at the point where it exits the structure to improve the velocity of exhaust away from the intake piping. See table 8.

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

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 41.

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 41.

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 41, 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 8.The intake piping may be equipped with a 90° elbow turndown. Using turndown will add 5 feet (1.5m) to the equivalent length of the pipe.

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 8.

UNCONDITIONED

ATTIC SPACE

FIGURE 33

Exiting Exhaust and Intake Vent

(different pressure zones)

Exhaust

Pipe

Furnace

Inlet Air

(Minimum 12 in.

305 MM) above

grade or snow

accumulation

FIGURE 34

Exiting Exhaust and Intake Vent

(different pressure zones)

Roof T

erminated

Exhaust Pipe

Inlet Air

Furnace

(Minimum 12 in. 305 MM) above

grade or snow

accumulation

FIGURE 35

Page 28

Page 29

EXHAUST PIPE TERMINATION SIZE REDUCTION

EL296UHV

MODEL

*045 and 070

*090 2” (51MM)

110 2” (51MM) 135 2” (51MM)

Termination

Pipe Size

1-1/2” (38MM)

*EL296UHV-045, -070 and -090 units with the flush mount termination must use the 1-1/2”accelerator supplied with the kit.

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

four terminations assembled together horizontally, as shown in figure 39.

TABLE 8

2” EXTENSION FOR 2” PVC PIPE1” EXTENSION FOR 3” PVC PIPE

FURNACE

4''

EXHAUST

PIPE

FURNACE

INTAKE

PIPE

GLUE EXHAUST

END FLUSH INTO

TERMINATION

FLAT SIDE

1-1/2” ACCELERATOR

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

FLUSH-MOUNT SIDE WALL TERMINATION

51W11 (US) or 51W12 (Canada)

FIGURE 36

1 1/2” (38mm) accelerator

EXHAUST

12” (305mm)

Minimum

Above Average

Snow

Accumulation

VENT

provided on 71M80 & 44W92

kits for EL296UHV045P24B,

070P24B & 070P36B

INTAKE

AIR

FLASHING

(Not Furnished)

FIELD-PROVIDED

REDUCER MAY BE REQUIRED

TO ADAPT LARGER VENT

PIPE SIZE TO TERMINATION

OUTSIDE

WALL

EXHAUST

VENT

INTAKE

AIR

CLAMP

(Not Furnished)

1-1/2” (38mm) accelerator

provided on 71M80 & 44W92

kits for EL296UHV045P24B,

070P24B & 070P36B

INTAKE

AIR

EXHAUST

VENT

AIR

12” (305mm) Min.

above grade or

average snow accumulation.

INTAKE

GRADE

DIRECT VENT CONCENTRIC WALL TERMINATION

71M80, 69M29 or 60L46 (US)

44W92 or 44W93 (Canada)

FIGURE 38

EXHAUST

VENT

INTAKE

AIR

Inches (MM)

optional intake elbow

5”

(127MM)

18” MAX. (457MM)

EXHAUST VENT

INTAKE

AIR

12”

(305MM)

5-1/2”

(140mm)

Front View

12” (305MM) Min.

above grade or

average snow

accumulation.

Side View

OPTIONAL VENT TERMINATION FOR MULTIPLE UNIT

INSTALLATION OF DIRECT VENT WALL TERMINATION KIT

(30G28 or 81J20)

FIGURE 39

EL296UHV DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

STRAIGHT-CUT OR

ANGLE-CUT IN DIRECTION

OF ROOF SLOPE *

8” - 12”

(203MM - 305MM)

3”-8”

(76MM-203MM)

SHEET METAL STRAP

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

CLAMP

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 37

FIELD-PROVIDED

Page 29

Minimum 12” (305MM)

above chimney top

plate or average snow

accumulation

*SIZE TERMINATION

PIPE PER TABLE 8.

NOTE - Do not discharge exhaust gases directly into any chimney or vent stack. If vertical discharge through an existing unused chimney or stack is required, insert pip ing inside chimney until the pipe open end is above top of chimney and terminate as illustrated. In any exterior portion of chimney, the exhaust vent must be insulated.

INTAKE PIPE

INSULATION (optional)

SHEET

METAL TOP

PLATE

INSULATE

TO FORM

SEAL

FIGURE 40

SHOULDER OF FITTINGS

PROVIDE SUPPORT

OF PIPE ON TOP PLATE

3” - 8”

(76MM-

203MM)

ALTERNATE INTAKE PIPE

EXTERIOR

PORTION OF

CHIMNEY

Page 30

NOTE − FIELD−PROVIDED

REQUIRED TO ADAPT

LARGER VENT PIPE SIZE

* WALL

SUPPORT

REDUCER MAY BE

TO TERMINATION

Intake Elbow

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 5 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.

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

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

termination is used and flue gases will impinge on the building materials, a corrosion−resistant shield (24 inches square) should be used to protect the wall surface. If optional tee is used, the protective shield is 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.

Intake Elbow

Intake and Exhaust

Intake

Front View of

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 41

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 42 through 43 show typical terminations.

1 - Exhaust piping must terminate straight out or up as

shown. The termination pipe must be sized as listed in table 8.The specified pipe size ensures proper veloc ity required to move the exhaust gases away from the building.

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.

SIZE TERMINATION

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)

PIPE PER TABLE 8.

UNCONDITIONED

ATTIC SPACE

FIGURE 42

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

above snow accumulation or other obstructions, pip ing must be supported every 24 inches (610MM). 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.

EL296UHV NON-DIRECT VENT APPLICATION

USING EXISTING CHIMNEY

SIZE TERMINATION PIPE PER TABLE 8.

Minimum 12” (305MM)

above chimney top

plate or average snow

accumulation

SHEET

METAL TOP

PLATE

INSULATE TO FORM

SEAL

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.

STRAIGHT-CUT OR

ANGLE-CUT IN DIRECTION

OF ROOF SLOPE

SHOULDER OF FITTINGS

PROVIDE SUPPORT

OF PIPE ON TOP PLATE

EXTERIOR

PORTION OF

CHIMNEY

FIGURE 43

Condensate Piping

This unit is designed for either right‐ or left‐side exit of con densate piping in upflow applications. In horizontal applica tions, the condensate trap must extend below the unit. An 8” service clearance is required for the condensate trap. Refer to figures 44 and 46 for condensate trap locations. Figure 52 shows trap assembly using 1/2” PVC or 3/4” PVC.

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.

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 44) from the cold end header box at the appropriate location on the side of the unit. Install provided 3/4 NPT street elbow fitting into cold end header box. Use Teflon tape or appropri ate pipe dope.

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

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

Page 31

Page 32

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.

Condensate line must maintain a 1/4” downward slope from the furnace to the drain.

CONDENSATE TRAP AND PLUG LOCATIONS

(Unit shown in upflow position)

Trap

(same on

right side)

1-1/2 in.

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 45.

Field Provided Drain Components

Elbow

Plug

(same on left side)

NOTE - In upflow applications where side return air filter is installed on same side as the conden sate trap, filter rack must be installed beyond condensate trap or trap must be re-located to avoid interference.

FIGURE 44

5 - Figures 48 and 49 show the furnace and evaporator

coil using a separate drain. If necessary the conden sate line from the furnace and evaporator coil can drain together. See figures 47, 50 and 51. Upflow furnace (figure 50) - In upflow furnace applica tions the field provided vent must be a minimum 1” to a maximum 2” length above the condensate drain outlet connection. Any length above 2” may result in a flooded heat exchanger if the combined primary drain line were to become restricted. Horizontal furnace (figure 51) - In horizontal furnace applications the field provided vent must be a mini mum 4” to a maximum 5” length above the condensate drain outlet connection. Any length above 5” may re sult in a flooded heat exchanger if the combined pri mary drain line were to become restricted.

NOTE - In horizontal applications it is recommended to install a secondary drain pan underneath the unit and trap assembly.

Tubing

Barbed Fitting

Hose Clamp

FIGURE 45

CAUTION

Do not use copper tubing or existing copper conden sate lines for drain line.

6 - If unit will be started immediately upon completion of

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

CONDENSATE TRAP LOCATIONS

(Unit shown in upflow position with remote trap)

FieldProvidedVent

Min.1” AboveCondensate

Drain

Connection

1”

Min.

2”Max.

*5’ max.

PVCPipeOnly

Trap can be installed a

maximum 5' from furnace

To Drain

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

FIGURE 46

Page 32

Page 33

Condensate Trap With Optional Overflow Switch

From Evaporator Coil

HorizontalFurnace4”Min.to 5”Max.above

condensatedrainconnection)

FurnaceCondensate

DrainConnection

Optional

FIGURE 47

Condensate line must slope downward away from the trap to drain. If drain level is above condensate trap, condensate pump must be used. Condensate drain line should be routed within the conditioned space to avoid freezing of condensate and blockage of drain line. If this is not possible, a heat cable kit may be used on the condensate trap and line. Heating cable kit is available from Lennox in various lengths; 6 ft. (1.8m) kit no. 26K68; 24 ft. (7.3m) - kit no. 26K69; and 50 ft. (15.2m) - kit no. 26K70.

EL296UHV With Evaporator Coil Using A Separate Drain

Evaporator drain

line required

(Trap at coil is optional)

Field Provided Vent (1” min. 2” max. above condensate connec tion)

Condensate

DrainConnection

Drain Pan

FIGURE 48

EL296UHV with Evaporatoir Coil Using a Separate Drain

(Unit shown in horizontal left-hand discharge position)

Evaporator

Coil

4”min

5”max

5’ max.

PVC Pipe Only

Condensate

DrainConnection

(Trap at coil is optional)

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

FIGURE 49

Field Provided Vent (4” min. to 5” max. above condensate connection)

Page 33

Page 34

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.

EL296UHV with Evaporator Coil Using a Common Drain

(Unit shown in horizontal left−hand discharge position)

EL296UHV with Evaporator Coil Using a Common Drain

(Trap at coil is optional)

(1”min. to 2”Max.above

condensatedrainconnection)

Condensate

Drain

Connection

FIGURE 50

Evaporator drain

line required

Drain

Pan

Evaporator

Coil

4”min 5”max

5’ max.

PVC Pipe Only

CondensateDrain

Connection

(Trap at coil is optional)

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

FIGURE 51

(4”min. to 5”Max.above

condensatedrain

connection)

Page 34

Page 35

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

OptionalDrainPipingFromTrap

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

(Not Furnished)

Drain Trap

Assembly

(Furnished)

Condensate Drain

Connection In Unit

90° Elbow

3/4 inch PVC

(Not Furnished)

Drain

DrainTrapAssembly

(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 35

Page 36

Gas Piping

Gas supply piping should not allow more than 0.5”W.C. drop in pressure between gas meter and unit. Supply gas pipe must not be smaller than unit gas connection.

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 exceed 600 in-lbs (50 ft-lbs) torque when at taching 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.

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 9 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 and

55.

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.

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

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

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).

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 61.

WARNING

FIRE OR EXPLOSION HAZARD Failure to follow the safety warnings exactly could result in serious injury, death, or property damage. Never use an open flame to test for gas leaks. Check all connections using a commercially available soap solution made specifically for leak detection. Some soaps used for leak detection are corrosive to cer tain metals. Carefully rinse piping thoroughly after leak test has been completed.

Page 36

Page 37

Left Side Piping

(Standard)

MANUAL

MAIN SHUT-OFF

VALVE

Right Side Piping

(Alternate)

MANUAL

MAIN SHUT-OFF

VALVE

GROUND

JOINT UNION

MANUAL

MAIN SHUT-OFF

VALVE

GROUND

JOINT

UNION

DRIP LEG

Gas Valve

FIELD

PROVIDED

AND INSTALLED

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

FIGURE 54

Horizontal Applications

Possible Gas Piping Configurations

MANUAL

MAIN SHUT-OFF

VALVE

GROUND

JOINT

UNION

DRIP LEG

Gas Valve

GROUND

JOINT

UNION

DRIP LEG

Horizontal Application

Left-Side Air Discharge

Horizontal Application

Right-Side Air Discharge

Gas Valve

FIELD

PROVIDED

AND INSTALLED

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

FIGURE 55

Gas Valve

MANUAL

MAIN SHUT-OFF

VALVE

GROUND

JOINT

UNION

DRIP LEG

Page 37

Page 38

GAS PIPE CAPACITY - FT

TABLE 9

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)

(12.79)

(19.17)

(36.81)

(58.89)

(103.92)

(1.58)

117

(3.31)

220

(6.23)

452

677

1300

2080

3670

(1.47)

110

(3.11)

207

(5.86)

424

(12.00)

635

(17.98)

1220

(34.55)

1950

(55.22)

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 38

Page 39

Electrical

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

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.

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 damage, 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.

INTERIOR MAKE-UP BOX INSTALLATION

remove and relocate

plug to unused

opening on left side

MAKE-UP

BOX

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.

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

10.

TABLE 10

EL296UH Model

045V36B, 070V36B, 090V36C,

090V48C, 110V48C

090V60C, 110V60C, 135V60D 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 11 and figure 59. Use 18-gauge wire or larger that is suitable for Class II ra ting for thermostat connections.

Maximum Over-Current

Protection (Amps)

FIGURE 56

Refer to figure 59 for unit schematic and field wiring. See figures 57 and 58 for icomfort Wi-Fi communicating applications. Table 11 shows DIP switch and on-board link settings for non-communicating thermo stat applications. Typical wiring schematic is shown in fig ure 59.

Right Side

thermostat wiring in

Page 39

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 EL296UHV 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 60 for control configuration. This terminal is energized when the indoor blower is operat ing.

Page 40

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 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 11 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 41.

Non-Communicating

In non-communicating applications the EL296UHV 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 EL296UHV 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 EL296UHV is used with icomfort Wi-

thermostat, proper indoor blower speed selections

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 WiFi® 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 40

Page 41

icomfort Wi-Fi

Thermostat with EL296UHV

and Non-Communicating Outdoor Unit

icomfort Wi-Fi® Thermostat with EL296UHV

and icomfort

-ENABLED Outdoor Unit

icomfort Wi-Fi® Thermostat icomfort®-Enabled EL296UHV Indoor Furnace Non-Communicating Outdoor Air Conditioner

icomfort®ENABLED

EL296UHV

OPTIONAL

DISCHARGE

AIR SENSOR

icomfort Wi-Fi®

THERMOSTAT

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

TWO-STAGE OPERATION

FURNACE

AIR SENSOR

NON-COMMUNICATING

OUTDOOR AIR

CONDITIONING UNIT -

1 OR 2 STAGE

OPTIONAL OUTDOOR

icomfort Wi-Fi® Thermostat icomfort icomfort

AIR SENSOR

® ®

OPTIONAL DISCHARGE AIR SENSOR

OPTIONAL

OUTDOOR

icomfort Wi-Fi® THERMOSTAT

-Enabled EL296UHV Indoor Furnace

-Enabled Outdoor Air Conditioner or Heat Pump

icomfort®-

ENABLED

EL296UHV

FURNACE

- ENABLED

icomfort

OUTDOOR AIR CONDITIONING

OR HEAT PUMP UNIT

Outdoor Unit

Indoor Unit Controller

Single wire to terminal C

Unused wires

Single wire to terminal C

Unused wires

Communicating systems using the Icomfort Wi-Fi® thermostat require four ther mostat 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 ther mostat 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 disconnected.

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 in the diagram above.

FIGURE 57

Icomfort Wi-Fi thermostat

Page 41

Page 42

Optional Accessories for use with any icomfort Touch

NOTE: Icomfort Wi-Fi® THERMOSTAT SENSES HUMIDITY & CONTROLS HUM CONTACTS TO CYCLE HUMIDIFIER BASED ON DEMAND. NO OTHER CONTROL OR HUMIDISTAT RE QUIRED.

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).

System

120V CONNECTIONS

“HUM” CONTACT IS CLOSED ANYTIME HUMIDITY DEMAND IS PRESENT

icomfort® ENABLED

Discharge Air Sen

sor (Required for

even heat)

Icomfort Wi-Fi

THERMOSTAT

EL296UHV FURNACE

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

EL296UHV 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

ENABLED

icomfort

EL296UHV FURNACE

THROUGH CURRENT LOOP.

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 system, 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 Wi-Fi 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 EL296UHV FURNACE

DEHUMIDIFIER CONTROL

Rf WGhGsCf

HVAC EQUIP

NON-COMMUNICATING SYSTEM WIRING

ENABLED

icomfort

EL296UHV FURNACE

FIGURE 58

Page 42

CUT R-DS W914

COMMUNICATING SYSTEM WIRING

Page 43

Thermostat

1 Heat / 1 Cool

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

TABLE 11

EL296 Field Wiring Applications With Conventional Thermostat

DIP Switch Settings and On-Board Links (See figure 60)

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 43

Page 44

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (See figure 60)

DIP Switch 1

Thermostat

Heating

Stages

2 Heat / 2 Cool OFF

TABLE 11

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 44

T'STAT

*Not required on all units

FURNACE

TERM. STRIP

OUTDOOR

UNIT

Page 45

Thermostat

Dual Fuel Single Stage Heat Pump

ComfortSense 7000 L7724U thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control

TABLE 11

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (figure 60)

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

L7724U T'STAT

HEAT PUMP

67M41*

Dual Fuel Two Stage Heat Pump

ComfortSense

OFF

CUT ON-BOARD LINK

W915

2 STAGE

COMPR

L7724U T'STAT

FURNACE

TERM. STRIP

HEAT PUMP

67M41*

7000 L7724U thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat

CUT ON-BOARD LINK

W951 HEAT

PUMP

control

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 45

Page 46

Thermostat

Dual Fuel Single Stage Heat Pump

ComfortSense 7000 L7742U thermostat w/ dual fuel capa bilities Capable of 2 stage gas heat control w/dehu midification control

TABLE 11

EL296 Field Wiring Applications With Conventional Thermostat (Continued)

DIP Switch Settings and On-Board Links (figure 60)

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

L7742U T'STAT

HEAT PUMP

67M41*

Dual Fuel Two Stage Heat Pump

ComfortSense 7000 L7742U 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

L7742U 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 46

Page 47

EL296UHV Schematic Wiring Diagram

FIGURE 59

Page 47

Page 48

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

icomfort

COMMUNICATING

OUTDOOR

EQUIPMENT

TB84

icomfort

COMMUNICATING

INDOOR

THERMOSTAT

I + I -CRI + I -

TB82, future use

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

TB83 icomfort Communicating Outdoor Equipment

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

TB84 icomfort 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

REVERSING VALVE

THERMOSTAT ONLY

AND A NON-COMMUNICATING OUTDOOR UNIT

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

FIGURE 60

Page 48

Page 49

Integrated Control DIP Switch Settings Conventional Thermostat (non-communicating)

EL296UHV 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 12 pro vides the blower off timings that will result from different switch settings.

TABLE 12

Blower Off Delay Switch Settings

Blower Off Delay

(Seconds)

Switch 3 Switch 4

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 13 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. See Product Specifications for more detailed blower cfm tables.

TABLE 13

Cooling Mode Blower Speeds

Speed

Switch 5 Switch 6

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 14 below provides blower speed adjustments that will result from different switch settings. Refer to tables for corresponding cfm val ues. See Product Specifications for more detailed blower cfm tables.

TABLE 14

Cooling Blower Speed Adjustment

Adjustment

Switch 7 Switch 8

+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 15 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.

Page 49

Page 50

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

TABLE 15

Cooling Mode Blower Speed Ramping

Ramping Option

Switch 9 Switch 10

A (Factory) Off Off

B Off On C On Off D On On

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

 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.

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

OFF

7 1/2 MIN

82%CFM

COMPRESSOR DEMAND

100% CFM

OFF

Ramping Option C

 Motor runs at 100% until demand is satisfied.

 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

Ramping Option D

 Motor runs at 100% until demand is satisfied.

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

100% CFM

COMPRESSOR

DEMAND

OFFOFF

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

-- The switches are factory set to the OFF position which

provides factory default heat speed. Refer to table 16 for switches 11, 12 and 13 that provided the corresponding in creases or decrease to both high and low heat demand.

TABLE 16

Heating Mode Blower Speeds

Heat Speed

Switch

Switch12Switch

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

TABLE 17

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 50

Page 51

BLOWER DATA

EL296UH045XV36B 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

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

Settings

+24% 915 1125

+18% 865 1085

+12% 805 1040

+6% 780 985

Factory Default 740 925

–6% 665 875

–12% 630 800

–18% 585 735

COOLING

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

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

High Low Medium-Low Medium-High2 High

+ 595 760 865 980 905 1075 1210 1370

Factory Default 540 660 785 890 815 980 1120 1255

– 485 600 695 790 720 885 1020 1135

BLOWER DATA

EL296UH070XV36B 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% 1095 1220

+18% 1035 1170

+12% 985 1120

+6% 915 1055

Factory Default 850 995

–6% 835 915

–12% 755 845

–18% 695 810

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 600 740 840 970 860 1060 1215 1365

Factory Default 555 665 770 855 810 960 1130 1265

– 500 600 680 790 705 840 1005 1140

Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control.

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 250 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 250 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

Page 51

Page 52

BLOWER DATA

EL296UH090XV36C 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

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

Settings

+24% 1215 1300

+18% 1140 1240

+12% 1100 1170

+6% 1020 111 5

Factory Default 965 1070

–6% 915 970

–12% 850 925

–18% 805 855

COOLING

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

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

High Low Medium-Low Medium-High2 High

+ 625 710 830 950 875 1040 1210 1360

Factory Default 565 670 760 860 800 945 1100 1245

– 520 610 685 785 720 840 970 1115

BLOWER DATA

EL296UH090XV48C 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% 1490 1645

+18% 1415 1565

+12% 1330 1480

+6% 1295 1405

Factory Default 1220 1325

–6% 1150 1260

–12% 1065 1190

–18% 1010 1105

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 840 1005 1155 1315 1165 1375 1580 1770

Factory Default 780 915 1045 1190 1075 1265 1440 1645

– 690 835 955 1070 935 1145 1320 1465

Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control.

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 380 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 380 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

Page 52

Page 53

BLOWER DATA

EL296UH090XV60C 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

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

Settings

+24% 1490 1985

+18% 1435 1915

+12% 1335 1805

+6% 1280 1645

Factory Default 1185 1625

–6% 1095 1530

–12% 990 1450

–18% 900 1345

COOLING

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

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

High Low Medium-Low Medium-High2 High

+ 1050 1270 1445 1620 1590 1815 2010 2195

Factory Default 975 1120 1295 1460 1460 1645 1845 2010

– 865 1010 1120 1290 1320 1500 1645 1860

BLOWER DATA

EL296UH110XV48C 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% 1470 1605

+18% 1450 1495

+12% 1385 1445

+6% 1295 1385

Factory Default 1225 1305

–6% 1160 1225

–12% 1090 1150

–18% 1035 1070

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 810 980 1085 1235 1100 1325 1530 1760

Factory Default 760 875 1010 1135 1025 1205 1405 1565

– 695 805 905 1040 920 1080 1260 1440

Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control.

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 380 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 380 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

Page 53

Page 54

BLOWER DATA

EL296UH110XV60C 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

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

Settings

+24% 1385 1965

+18% 1475 1880

+12% 1355 1790

+6% 1370 1725

Factory Default 1200 1630

–6% 1140 1550

–12% 1070 1460

–18% 980 1345

COOLING

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

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

High Low Medium-Low Medium-High2 High

+ 1060 1245 1345 1545 1560 1740 1930 2125

Factory Default 970 1145 1265 1395 1405 1565 1775 1945

– 885 1025 1110 1250 1270 1425 1610 1770

BLOWER DATA

EL296UH135XV60D 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% 1770 2125

+18% 1680 2015

+12% 1610 1935

+6% 1485 1855

Factory Default 1440 1740

–6% 1360 1650

–12% 1285 1565

–18% 1215 1460

Cooling Speed

DIP Switch

Settings

Low Medium-Low Medium-High

+ 1150 1310 1440 1610 1640 1840 2000 2250

Factory Default 1080 1210 1330 1475 1480 1660 1885 2035

– 985 1095 1210 1315 1330 1500 1675 1885

Cooling and heating speeds are based on a combination of DIP switch settings on the furnace control..

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 450 cfm. Lennox Harmony III™ Zone Control Applications - Minimum blower speed is 450 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

Page 54

Page 55

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 18 for operation sequence in ap plications including EL296UHV, a thermostat which fea tures humidity control and a single-speed outdoor unit. Table 19 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 18

OPERATING SEQUENCE

EL296UHV, 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

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

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

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

SYSTEM DEMAND SYSTEM RESPONSE

Compres

High 100%

High 70%*

High 100%

High 70%*

control

Status D

sor

Blower

CFM

(COOL)

control

Comments

Compressor and indoor blower follow thermostat demand

ComfortSense® 7000 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**

7000

will try to

Page 55

Page 56

TABLE 19

OPERATING SEQUENCE

EL296UHV, 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

7000 thermostat energizes Y2 and de-energizes D on a call for de-humidification

Dehumidification mode begins when humidity is greater than set point

ComfortSense® 7000 thermostat will try to maintain room humidity setpoint by allowing the room space to maintain a cooler room thermostat setpoint***

ComfortSense® 7000 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

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

Dave Lennox ComfortSense® 7000 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 56

VAC

High 70%**

control

ComfortSense® 7000 thermostat will try to maintain room humidity setpoint by allowing the room space to maintain a cooler room thermostat setpoint***

Page 57

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 service technician to inspect the furnace and to replace all gas controls, control system parts, and electrical parts that have been wet or to replace the furnace, if deemed necessary.

WARNING

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.

CAUTION

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

BEFORE LIGHTING the unit, smell all around the furnace

area for gas. Be sure to smell next to the floor because some gas is heavier than air and will settle on the floor.

The gas valve on the EL296UHV is equipped with a gas control switch (lever). Use only your hand to move switch. Never use tools. If the the switch will not move by hand, do not try to repair it. Force or attempted repair may result in a fire or explosion.

Placing the furnace into operation:

EL296UHV units are equipped with an automatic hot sur face ignition system. Do not ers 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 burn

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 61)

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 61. 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 61.

INLET PRESSURE POST

GAS VALVE SHOWN IN ON POSITION

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.

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 61

HIGH FIRE ADJUSTMENT

SCREW

(under cap)

Page 57

Page 58

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 20

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

-135 27 54 68 136

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

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 checking gas flow. Determine time in seconds for two revolutions of gas through the meter. (Two revolutions assures a more accurate time.) Divide by two and compare to time in table

20. If manifold pressure matches table 22 and rate is incor rect, check gas orifices for proper size and restriction. Re move temporary gas meter if installed.

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

Supply Pressure Measurement

An inlet post located on the gas valve provides access to the supply pressure. See figure 61. 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 22 for supply line pressure.

On multiple unit installations, each unit should be checked separately, with and without units operating. Supply pres sure must fall within range listed in table 22.

Manifold Pressure Measurement

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

A manifold pressure post located on the gas valve provides access to the manifold pressure. See figure 61. 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.

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 con

nect 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

22.

5 - If necessary, make adjustments. Figure 61 shows

location of high fire and low fire adjustment screws.

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

table 22.

NOTE - Shut unit off and remove manometer as soon as an accurate reading has been obtained. Re-start unit and check gas valve for gas leaks.

Page 58

Page 59

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.

TABLE 21

EL296 Model

CO2%

Low Fire High Fire Low Fire High Fire

For Nat

045 5.4 - 6.4 7.5 - 8.5 6.4 - 7.4 8.8 - 9.8

070 5.3 - 6.3 7.4 - 8.4 6.3 - 7.3 8.7 - 9.7

090 5.8 - 6.8 7.6 - 8.6 6.8 - 7.8 8.9 - 9.9

110 6.1 - 7.1 8.0 - 9.0 7.1 - 8.1 9.3 - 10.3

135 6.1 - 7.1 7.8 - 8.8 7.1 - 8.2 9.1 - 10.1

The maximum carbon monoxide reading should not exceed 50 ppm.

CO2%

For L.P

TABLE 22

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

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. See table 22 for de-rate manifold values. Units installed at altitude of 7501 - 10,000 feet require an orifice change. Units installed at altitude of 4501 - 10,000 feet re quire a pressure switch change which can be ordered sep arately. Table 23 lists conversion kit and pressure switch requirements 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

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

Low Fire

4.9 10.0 4.6 9.4 4.4 9.1 4.3 8.9 4.9 10.0 11.0 13.0

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 23

LP/Propane 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)

93W81 93W84

-070 93W80 93W85

-090 93W82 93W80

*78W93 73W37 *78W96

-110 93W80 93W85

-135 93W83 93W85

* 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 59

Page 60

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

horizontal pitch. Determine there is no blockage or re

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 EL296UHV 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 EL296UHV as well as to other gas‐fired appliances which are separately vented.

If a EL296UHV 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

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 located 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 con

nected to the common venting system properly vents

when tested as indicated in step 3, return doors, win

dows, exhaust fans, fireplace dampers and any other

gas‐burning appliance to their previous condition of

use.

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: EL296UHV045P24B-01. All service must be performed by a licensed

professional 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 Motor capacitor Blower housing cutoff plate

Heating Parts

Flame Sensor

Heat exchanger assembly

Gas manifold

Combustion air inducer

Gas valve

Main burner cluster

Main burner orifices

Pressure switch

Ignitor

Primary limit control

Flame rollout switches

Page 60

Page 61

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. Unit 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%

Heating Sequence of Operation

Electronic Ignition

The two-stage, variable speed integrated control used in EL296UHV units has an added feature of an internal Watchguard control. The feature serves as an automatic reset device for ignition control lockout caused by ignition failure. After one hour of continuous thermostat demand for heat, the Watchguard will break and remake thermostat demand to the furnace and automatically reset the control to 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 62 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 igni tion occurs. At the same time, the control module sends a signal to begin an indoor blower 30-second ON-delay. When the delay ends, the indoor blower motor is energized on the low fire heating speed, the HUM contacts close energizing the humidifier and 120V ACC terminal is energized. The furnace will con tinue this operation 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.

Page 61

Page 62

Applications Using A Single-Stage Thermostat

See figure 63 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 igni

tion occurs. At the same time, the control module

sends a signal to begin an indoor blower 30-second

ON-delay. When the delay ends, the indoor blower

motor is energized on the low fire heating speed and

the HUM contacts are energized. The integrated con

trol also initiates a second-stage on delay (factory-set

at 7 minutes; adjustable to 12 minutes). 5 - If the heating demand continues beyond the second-

stage on delay, the integrated control energizes the

combustion air inducer at high speed. The control also

checks the high fire (second stage) pressure switch to

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

gas valve is energized and the indoor blower motor is

energized for operation at the high fire heating speed. 6 - When the thermostat heating demand is satisfied, the

combustion air inducer begins a 5-second low speed

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

begins. The indoor blower operates at the low-fire

heating speed. 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.

OFF

1 stg heat demand

low speed CAI ignitor

low fire gas valve

indoor blower low heat

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.

OFF

heat demand

low speed CAI ignitor

low fire gas valve

indoor blower low heat

HEATING OPERATION WITH TWO-STAGE THERMOSTAT

Pre-Purge

Ignitor Warm-up

Trial For Ignition

30 seconds

30* second

blower

“on” delay

RECOGNITION PERIOD

FIGURE 62

HEATING OPERATION WITH SINGLE STAGE THERMOSTAT

Pre-Purge

Ignitor Warm-up

351

Trial For Ignition

30* second

blower

“on” delay

5 SEC80

Post

Purge

5 SEC80

Post

Purge

blower

“off” delay

blower

“off” delay

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.

FIGURE 63

Page 62

Page 63

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.

At the beginning of each heating season, system should be checked as follows by a qualified service technician:

Blower

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

WARNING

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

Filters

All air filters are installed external to the unit. Filters should be inspected monthly. Clean or replace the filters when necessary to ensure proper furnace operation. Table 1 lists recommended filter sizes.

Exhaust and air intake pipes

Check the exhaust and air intake pipes and all connections for tightness and to make sure there is no blockage.

NOTE - After any heavy snow, ice or frozen fog event the furnace vent pipes may become restricted. Always check the vent system and remove any snow or ice that may be obstructing the plastic intake or exhaust pipes.

Electrical

1 - Check all wiring for loose connections.

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

operating).

3 - Check amp-draw on the blower motor.

Motor Nameplate__________Actual__________

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 clean out cap.

Cleaning The Burner Assembly

If cleaning the burner assembly becomes necessary, fol low the steps below:

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

Remove upper and lower furnace access panels. 2 - Disconnect the wires from the gas valve. 3 - Remove the burner box cover (if equipped). 4 - Disconnect the gas supply line from the gas valve. Re

move gas valve/manifold assembly. 5 - Mark and disconnect sensor wire from the sensor. Dis

connect wires from flame rollout switches. 6 - Disconnect combustion air intake pipe. It may be nec

essary to cut the existing pipe to remove burner box

assembly. 7 - Remove four screws which secure burner box assem

bly to vest panel. Remove burner box from the unit. 8 - Use the soft brush attachment on a vacuum cleaner to

gently clean the face of the burners. Visually inspect

the inside of the burners and crossovers for any block

age caused by foreign matter. Remove any blockage. 9 - Reinstall the burner box assembly using the existing

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

center of the burner ports. 10 - Reconnect the sensor wire and reconnect the 2-pin

plug to the ignitor wiring harness. Reconnect wires to

flame rollout switches. 11 - Reinstall the gas valve manifold assembly. Reconnect

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

er box cover. 12 - Reconnect wires to gas valve. 13 - Replace the blower compartment access panel. 14 - Refer to instruction on verifying gas and electrical con

nections when re-establishing supplies. 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 heating compartment access panel.

Page 63

Page 64

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

FURNACE MODEL

EL296UH045V36B

EL296UH070V36B

EL296UH090V36B

EL296UH09048C

EL296UH090V60C

EL296UH110V48C

EL296UH110V60C

EL296UH135V60D

−

Turn room thermostat to OFF

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

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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.

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Page 66

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.

Page 66