Lennox EL296UH045XV36B, EL296UH110XV48C, EL296UH110XV60C, EL296UH135XV60D, EL296UH090XV48C Installation Instructions Manual

...

Dallas, Texas USA

INSTALLATION INSTRUCTIONS EL296UHV

ELITE® SERIIES GAS FURNACE UP/FLOW HORIZONTAL AIR DISCHARGE

507264-03 06/2017 Superseds 03/2017

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, personal injury or loss of life. Installation and service must be performed by a licensed professional HVAC installer or equivalent, service agency, or the gas supplier.

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 - inches (mm) .....................................2

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

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

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

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

Shipping Bolt Removal ...................................................8

Installation - Setting Equipment ...................................... 8

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

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

Pipe & Fittings Specications .......................................13

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

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

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

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

NOTICE

A thermostat is not included and must be ordered separately.

The Lennox icomforti® thermostat must be used in communicating applications.

In non-communicating applications, the Lennox ComfortSense® 7500 thermostat may be used, as well as other non-communicating thermostats.

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

Field wiring for both communicating and noncommunicating applications is illustrated in diagrams,

which begin on Page 41.

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

Conventional Thermostat (non-communicating) ...........49

Blower Data .................................................................. 51

On-Board Links.............................................................55

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

Gas Pressure Adjustment ............................................. 58

Proper Cumbustion.......................................................59

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

Combustion Air for Non-Direct Vent Applications .........60

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

Other Unit Adjustments................................................. 61

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

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

Program Unit Capacity/Size Mode ...............................65

Requirements for Commonwealth of Massachusetts ... 66

Page 1

Unit Dimensions - inches (mm)

NOTE - 60C and 60D size units that require second stage

air volumes over 1800 cfm must have one of the following:

1. Single side return air with transition, to accommodate 20 x 25 x 1 in. 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 Ta bles for additional information.

Optional Side Return Air Filter Kit is not for use with the Optional Return Air Base.

one side return air.

1-7/8 (48)

3-1/4

(83)

EXHAUST AIR

OUTLET

SUPPLY AIR

OPENING

Flue Condensate Trap Assembly

Furnished for external field installation on either side of unit. (See installation instructions for additional information.)

9/16 (14)

OPTIONAL

SIDE RETURN

AIR FILTER KIT

(Either Side)

14-3/4

(375)

(406)

(178)

(838)

COMBUSTION

AIR INTAKE

SIDE RETURN

AIR FILTER KIT

(Either Side)

1-1/2 (38)

Front Panel

6-9/16 (167)

12-5/8 (321)

(Either Side)

ELECTRICAL

INLET

(Either Side)

OPTIONAL

Left

9 (229)

Right

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)

(635)

19-7/16

(494)

(356)

9/16 (14)

1-1/2

(38)

AIR FLOW

3/4

(19)

Bottom Return

Air Opening

FRONT VIEW SIDE VIEW

Model A B C D

EL296UH045XV36B

EL296UH070XV36B

EL296UH090XV36C EL296UH090XV48C EL296UH090XV60C EL296UH110XV48C EL296UH110XV60C

EL296UH135XV60D 24−1/2 in 622 mm 23−3/8 in 594 mm 23 in 584 mm 11−1/8 in 283 mm

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

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

3/4

(19)

5/8

(16)

Page 2

3-1/4

(83)

23-1/2

(597)

Bottom Return

Air Opening

1-15/16 (49)

EL296UHV Gas Furnace

NON-DIRECT VENT

INSTALLATION

NON-DIRECT VENT

INSTALLATION

COMBUSTION

AIR INTAKE INSIDE

VENTILATED

CRAWL SPACE

COMBUSTION

AIR INTAKE INSIDE

VENTILATED

ATTIC SPACE

EXHAUST OUTLET

The EL296UHV Category IV gas furnace is shipped ready for installation in the upow or horizontal position. The furnace is shipped with the bottom panel in place. The bottom panel must be removed if the unit is to be installed

in horizontal or upow 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 applications. A conversion kit (ordered separately) is required for use in propane/LP gas applications.

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

en from outdoors and ue gases are discharged outdoors.

In Non-Direct Vent installations, combustion air is taken

from indoors or ventilated attic or crawlspace and ue gases are discharged outdoors. See for applications involving roof termination.

DIRECT VENT INSTALLATION NON-DIRECT VENT

EXHAUST OUTLET

COMBUSTION

AIR INTAKE OUTSIDE

OF HOUSE

INSTALLATION

EXHAUST

OUTLET

Shipping and Packing List

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 nd 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

Figure 2

COMBUSTION

AIR INTAKE

INSIDE

OF HOUSE

CAUTION

As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.

DANGER

Danger of explosion. There are circumstances in which odorant used with LP/

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

propane gas will settle close to the oor and may be difcult 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 certied 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.

Page 3

In order to ensure proper unit operation in non-direct vent

Gas Unit

Heating Unit Installed Upstream of Cooling Unit

Gas Unit

Dampers

(open during heating operation only)

Dampers

(open during cooling operation only)

Heating Unit Installed Parallell to Air Handler Unit

Air Handler Unit

Evaporator

applications, combustion and ventilation air supply must be provided according to the current National Fuel Gas Code or CSA-B149 standard.

Installation Locations

This furnace is CSA International certied 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 re protection clearances.

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

For installation in a residential garage, the furnace must be installed so that the burner(s) and the ignition source are located no less than 18 inches (457 mm) above the

oor. The furnace must be located or protected to avoid

physical damage by vehicles. When a furnace is installed in a public garage, hangar, or other building that has a hazardous atmosphere, the furnace must be installed according to recommended good practice requirements and current National Fuel Gas Code or CSA B149 standards.

NOTE - Furnace must be adjusted to obtain a temperature

rise within the range specied on the unit nameplate. Failure to do so may cause erratic limit operation and premature 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 compartment. With a

parallel ow arrangement, a damper (or other means to control the ow of air) must adequately prevent chilled ai

from entering the furnace. If the damper is manually operated, it must be equipped to prevent operation of either the heating or the cooling unit, unless it is in the full HEAT or COOL setting.

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

National Fire Protection Association

1 Battery March Park

Quincy, MA 02269

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

Figure 3

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

The EL296UHV furnace may be installed in alcoves, closets, attics, basements, garages, crawl spaces and utility

rooms in the upow or horizontal position. This furnace design has not been CSA certied for installation in mobile

homes, recreational vehicles, or outdoors.

Use of Furnace as Construction Heater

NOTE - Gas furnaces manufactured on or after May 1st 2017 are not permitted to be used in Canada for heating of buildings or structures under construction.

The following statement only applies to the US. 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, construction dust and operation of the unit with clogged or misplaced

lters may damage the unit.

However, EL296UHV units may be used for heating of

buildings or structures under construction in the US, if the

following conditions are met to ensure proper operation:

• The vent system must be permanently installed per

these installation instructions.

• A room thermostat must control the furnace. The

use of xed jumpers that will provide continuous heating is not allowed.

• The return air duct must be provided and sealed to

the furnace.

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

and 80°F (27°C) must be maintained.

• Air lters must be installed in the system and must

be maintained during construction.

Page 4

• Air lters must be replaced upon construction com-

pletion.

• The input rate and temperature rise must be set per

the furnace rating plate.

• One hundred percent (100%) outdoor air must be

provided for combustion air requirements during construction. Temporary ducting may supply outdoor air to the furnace. Do not connect duct directly to the furnace. Size the temporary duct following these instructions in section for Combustion, Dilution and Ventilation Air in a conned space with air from outside.

• The furnace heat exchanger, components, duct

system, air lters and evaporator coils must be thoroughly cleaned following nal construction clean-up.

• All furnace operating conditions (including ignition,

input rate, temperature rise and venting) must

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 distribution system as possible. The furnace should also be located close to the vent termination point.

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

• When the furnace is installed in non-direct vent applications, do not block the furnace combustion air opening with clothing, boxes, doors, etc. Air is needed for proper combustion and safe unit operation.

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

• When the furnace is installed in an unconditioned space, consider provisions required to prevent freezing of 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. Adequate space must be provided between the drain pan and the furnace heat exchanger.

CAUTION

EL296UHV unit should not be installed in areas normally subject to freezing temperatures.

WARNING

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

WARNING

Insufcient combustion air can cause headaches,

nausea, dizziness or asphyxiation. It will also cause excess water in the heat exchanger resulting in rusting and premature heat exchanger failure. Excessive exposure to contaminated combustion air will result in safety and performance related problems. Avoid exposure to the following substances in the combustion air supply:

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

Combustion, Dilution & Ventilation Air

If the EL296UHV is installed as a Non-Direct Vent Furnace, follow the guidelines in this section.

NOTE - In Non-Direct Vent installations, combustion air is taken from indoors or ventilated attic or crawlspace and

ue gases are discharged out-doors.

In the past, there was no problem in bringing in sufcient outdoor air for combustion. Inltration provided all the air

that was needed. In today’s homes, tight construction practices make it necessary to bring in air from outside for combustion. Take into account that exhaust fans, appli-

ance vents, chimneys, and replaces force additional air

that could be used for combustion out of the house. Unless outside air is brought into the house for combus-

tion, negative pressure (outside pressure is greater than inside pressure) will build to the point that a downdraft can occur in the furnace vent pipe or chimney. As a result, combustion gases enter the living space creating a potentially dangerous situation.

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 ef-

Page 5

cient and safe operation. You must consider combustion air needs and requirements for exhaust vents and gas piping. A portion of this information has been reprinted with permission from the National Fuel Gas Code (ANSI. Z223.1/NFPA 54). This reprinted material is not the com-

plete and ofcial position of the ANSI on the referenced

subject, which is represented only by the standard in its entirety.

In Canada, refer to the CSA B149 installation codes.

CAUTION

Do not install the furnace in a corrosive or contaminated atmosphere. Meet all combustion and ventilation air requirements, as well as all local codes.

All gas-red appliances require air for the combustion process. If sufcient combustion air is not available, the furnace or other appliance will operate inefciently and

unsafely. Enough air must be provided to meet the needs of all fuel-burning appliances and appliances such as exhaust fans which force air out of the house. When replaces, exhaust fans, or clothes dryers are used at the same time as the furnace, much more air is required to ensure proper combustion and to prevent a downdraft. Insufcient air causes incomplete combustion which can result in carbon monoxide.

In addition to providing combustion air, fresh outdoor air dilutes contaminants in the indoor air. These contaminants may include bleaches, adhesives, detergents, solvents and other contaminants which can corrode furnace components.

The requirements for providing air for combustion and ventilation depend largely on whether the furnace is in-

stalled in an unconned or a conned space.

Unconned Space

An unconned space is an area such as a basement or

large equipment room with a volume greater than 50 cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the combined 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

unconned, it might be necessary to bring in outdoor air

for combustion if the structure does not provide enough air

by inltration. 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

Conned Space

A conned space is an area with a volume less than 50

cubic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the combined input rating of all appliances installed in that

space. This denition includes furnace closets or small

equipment rooms.

When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space containing the furnace, the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace.This is especially important when the furnace is mounted on

a platform in a conned space such as a closet or small

equipment room. Even a small leak around the base of the unit at the plat-

form or at the return air duct connection can cause a potentially dangerous negative pressure condition. Air for combustion and ventilation can be brought into the con-

ned space either from inside the building or from outside.

Air from Inside

If the conned space that houses the furnace adjoins a space categorized as unconned, 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 mm2) per 1,000 Btu (.29 kW) per hour of

total input rating of all gas-red equipment in the conned

space. Each opening must be at least 100 square inches (64516 mm2). One opening shall be within 12 inches (305 mm) of the top of the enclosure and one opening within 12 inches (305 mm) of the bottom. See Figure 4.

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM INSIDE

ROOF TERMINATED

EXHAUST PIPE

OPENINGS

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

NOTE - Each opening shall have a free area of at least one square inch per 1,000 Btu (645mm 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

Page 6

Air from Outside

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE

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

EQUIPMENT IN CONFINED SPACE

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

EQUIPMENT IN CONFINED SPACE

If air from outside is brought in for combustion and ventilation, the conned space shall be provided with two permanent openings. One opening shall be within 12” (305mm) of the top of the enclosure and one within 12” (305mm) of the bottom. These openings must communicate directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indirectly through vertical ducts. Each opening shall have a minimum free area of 1 square inch per 4,000 Btu (645mm2 per 1.17kW) per hour of total input rating of all equipment in the enclosure. When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch per 2,000 Btu (645mm2 per .59kW) per total input rating of all equipment in the enclosure (See Figure 5). It is also permissible to bring in air for combus-

tion from a ventilated attic (gure 6) or ventilated crawl

space (Figure 7).

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

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

Roof Terminated

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)

VENTILATION LOUVERS

OUTLET

AIR

(Each end of attic)

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

FURNACE

INLET

AIR

Figure 5

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

Ventilation Louvers

Roof Terminated

Exhaust Pipe

*Intake Debris

Screen

(Provided)

Furnace

(Minimum

12 in.(305mm) Above

attic floor)

VENTILATION

LOUVERS

(For unheated

crawl space)

Inlet Air

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm 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 ventilation, the conned space must have two permanent openings. 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 directly or by ducts with the outdoors or spaces (crawl or attic) that freely communicate with the outdoors or indirectly through vertical ducts. Each opening shall have a minimum free area of 1 square inch (645 mm2) per 4,000 Btu (1.17 kW) per hour of total input rating of all equipment in the enclosure. See Figure 5 and Figure 8. When communicating with the outdoors through horizontal ducts, each opening shall have a minimum free area of 1 square inch (645 mm2) per 2,000 Btu (.56 kW) per total input rating of all equipment in the enclosure. See Figure 9.

When ducts are used, they shall be of the same cross-sectional 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 covering is not known for calculating the size opening required, it may be assumed that wood louvers will have 20 to 25 percent free area and metal louvers and grilles will have 60 to 75 percent free area. Louvers and grilles

must be xed in the open position or interlocked with the

equipment so that they are opened automatically during equipment operation.

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm

Figure 6

per 1.17kW) per

Page 7

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE

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

ROOF TERMINATED

EQUIPMENT IN CONFINED SPACE - ALL AIR FROM OUTSIDE

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

EXHAUST PIPE

(All Air Through Ventilated Attic)

VENTILATION LOUVERS

(Each end of attic)

OUTLET

AIR

The bolt and washer must be removed before the furnace is placed into operation. After the bolt and washer have been removed, the rigid leg will not touch the blower housing.

UNITS 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

FURNACE

INLET AIR

(Ends 12” above

bottom)

per 1.17kW) per hour

Figure 8

(All Air Through Ventilated Attic)

ROOF TERMINATED

EXHAUST PIPE

OUTLET

AIR

SIDE WALL

TERMINATED

EXHAUST PIPE

(ALTERNATE

LOCATION)

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch per 4,000 Btu (645mm

FURNACE

VENTILATION LOUVERS

(Each end of attic)

INLET AIR

(Ends 12” above

bottom)

per 1.17kW) per hour

Figure 9

Shipping Bolt Removal

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

exible legs and one rigid leg. The rigid leg is equipped with a shipping bolt and a at white plastic washer (rather than the rubber mounting grommet used with a exible

mounting leg). See Figure 10.

remove shipping bolt and washe

RIGID LEG

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.

Upow Applications

The EL296UHV gas furnace can be installed as shipped in the upow position. Refer to Figure 12 for clearances. Select a location that allows for the required clearances that are listed on the unit nameplate. Also consider gas supply connections, electrical supply, vent connection, condensate trap and drain connections, and installation and service clearances [24 inches (610 mm) at unit front]. The unit must be level from side to side. The unit may be

positioned from level to ½” toward the front. See Figure

11.

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

Page 8

SETTING EQUIPMENT

END VIEW

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

UPFLOW APPLICATION

UNIT

FRONT

1/2” max.

SIDE VIEW

AIR FLOW

FRONT VIEW

UNIT

FRONT

SIDE VIEW

HORIZONTAL APPLICATION

AIR FLOW

FRONT VIEW

Figure 11

UNIT

FRONT

1/2”

max.

Page 9

WARNING

Installation Clearances

Side Return Air

Improper installation of the furnace can result in

personal injury or death. Combustion and ue products

must never be allowed to enter the return air system or air in the living space. Use sheet metal screws and joint tape to seal return air system to furnace. In platform installations with furnace return, the furnace should be sealed airtight to the return air plenum. A door must never be used as a portion of the return air duct system. The base must provide a stable support and an airtight seal to the furnace. Allow absolutely no sagging, cracks, gaps, etc.

For no reason should return and supply air duct systems ever be connected to or from other heating devices

such as a replace or stove, etc. Fire, explosion, carbon

monoxide poisoning, personal injury and/or property damage could result.

Return Air Guidelines

Return air can be brought in through the bottom or either

side of the furnace installed in an upow 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.) require either a return air base or eld-fabricated

transition to accommodate an optional IAQ accessory taller than 14.5”. See Figure 13.

Top

Left Side Right 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 furnace

directly on carpeting, tile or other combustible materials other than wood flooring.

(with transition and filter)

20” X 25” X 1”

(508mmX635mmX 25mm)

Air Filter

Return

Air

Plenum

Transition

Figure 13

Figure 12

Page 10

CONDENSATE

Removing the Bottom Panel

Bottom Panel

See figure 4.

TRAP

AIR FLOW

17−1/2 (446) B Width (50W98) 21 (533) C Width (50W99) 24−1/2 (622) D Width (51W00)

FURNACE

INDOOR AIR

QUALITY

CABINET

(PCO, Filter

Cabinet, etc.)

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 or more of air (W x H): 23 x 11 in. (584 x 279 mm). The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown. Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air opening. The size of the opening must not extend beyond the markings on the furnace cabinet.

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

Optional Return Air Base

(Upflow Applications Only)

FRONT

IF BASE

IS USED

WITHOUT

IAQ CABINET,

A SINGLE

RETURN AIR

PLENUM

MUST

COVER BOTH

UNIT AND

RETURN

AIR BASE

OPENINGS

OPTIONAL RETURN AIR BASE

3−1/4

(83)

7−1/4

(184)

23 (584)

Overall

(Maximum)

Unit side return air

Opening

SIDE RETURN

5−5/8

AIR OPENINGS

(143)

(Either Side)

26−7/8

(683)

SIDE VIEW

(584)

Minimum

11 (279)

Maximum

14 (356)

22−7/16

(570)

Overall

(Maximum)

3/4

(19)

Figure 14

Screw

Figure 15

Removing the Bottom Panel

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

Horizontal Applications

WARNING

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

Bottom Cap

Front Back

Figure 16

Page 11

The EL296UHV furnace can be installed in horizontal ap-

Horizontal Application

HORIZONTAL SUSPENSION KIT

plications with either right- or left-hand air discharge. Refer to Figure 17 for clearances in horizontal applications.

Installation Clearances

Metal Strap

(typical)

Internal Brace

(provided with kit)

Right-Hand Discharge

Air

Flow

dnE thgiRdnE tfeL

AIR FLOW

Air

Flow

Bottom (Floor)**

Left-Hand Discharge

Top

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 furnace directly on carpeting, tile or other combustible materials other than wood flooring.

Figure 17

Suspended Installation of Horizontal Unit

This furnace may be installed in either an attic or a crawlspace. Either suspend the furnace from roof rafters or oor joists, as shown in Figure 18, or install the furnace on a platform, as shown in Figure 19. A horizontal suspension kit (51W10) may be ordered from Lennox or use 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 interfere with the plenum or exhaust piping installation.

Cooling 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

nished 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

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

4 - Route auxiliary drain line so that water draining from

this outlet will be easily noticed by the homeowner.

5 - If necessary, run the condensate line into a

condensate 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

INTAKE PIPE

EXHAUST PIPE

*Gas connector may be used for Canadian

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 furnace installed in the horizontal position. The furnace is equipped with a removable bottom panel to facilitate installation. See Figure 15.

Filters

This unit is not equipped with a lter or rack. A eld-provided high velocity rated lter is required for the unit to operate properly. Table 1 lists recommended lter sizes. A lter must be in place whenever the unit is operating.

IMPORTANT

If a highefciency lter is being installed as part of this system to ensure better indoor air quality, the lter must be properly sized. Highefciency lters have a higher static pressure drop than standardefciency glass/foam lters. If the pressure drop is too great, system capacity

and performance may be reduced. 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 lter with this system, check the specications provided by the lter manufacturer against

the data given in the appropriate Lennox Product

Specications bulletin. Additional information is provided

in Service and Application Note ACC002 (August 2000).

TABLE 1

Furnace

Cabinet Width

Side Return Bottom Return

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

21” 16 X 25 X 1 (1) 20 X 25 X 1 (1)

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

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 certied 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 always 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 replace) is installed.

When return air is drawn from a room, a negative pressure is created in the room. If a gas appliance is operating in

a room with negative pressure, the ue products can be

pulled back down the vent pipe and into the room. This reverse ow of the ue gas may result in incomplete combustion 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

furnace allowed only in upow 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 berglass sealing strips, caulking, or equivalent sealing method between the plenum and the furnace

cabinet to ensure a tight seal. If a lter is installed, size the return air duct to t the lter frame.

Pipe & Fittings Specications

All pipe, ttings, primer and solvent cement must conform

with American National Standard Institute and the American Society for Testing and Materials (ANSI/ASTM) stan-

dards. The solvent shall be free owing and contain no

lumps, undissolved particles or any foreign matter that adversely affects the joint strength or chemical resistance of the cement. The cement shall show no gelation, strati-

cation, or separation that cannot be removed by stirring. Refer to the table 2 below for approved piping and tting

materials.

Page 13

CAUTION

Solvent cements for plastic pipe are ammable liquids

and should be kept away from all sources of ignition. Do not use excessive amounts of solvent cement when making joints. Good ventilation should be maintained to

reduce re hazard and to minimize breathing of solvent

vapors. Avoid contact of cement with skin and eyes.

TABLE 2

PIPING AND FITTINGS SPECIFICATIONS

Schedule 40 PVC (Pipe) D1785

Schedule 40 PVC (Cellular Core Pipe) F891

Schedule 40 PVC (Fittings) D2466

Schedule 40 CPVC (Pipe) F441

Schedule 40 CPVC (Fittings) F438

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

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

Schedule 40 ABS Cellular Core DWV (Pipe)

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

InnoFlue® by Centrotherm

F628

D2661

D2665

ASTM

SPECIFICATION

D2564, D2235,

F493

D3188

MARKING

ULCS636

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 connections to the

PVC ttings in the unit.

Use PVC primer and solvent cement or ABS solvent ce-

ment meeting ASTM specications, refer to Table 2. As an

alternate, use all purpose cement, to bond ABS, PVC, or

CPVC pipe when using ttings 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

inside socket surface of tting and male end of pipe to depth of tting socket.

Canadian Applications Only - Pipe, ttings, primer and solvent cement used to vent (exhaust) this appliance must be certied to ULC S636 and supplied by a single manufacturer as part of an approved vent (exhaust) system. In addition, the rst three feet of vent pipe from the furnace ue collar must be accessible for inspection.

Page 14

TABLE 3

OUTDOOR TERMINATION USAGE*

STANDARD CONCENTRIC

Wall Kit

2 inch 3 inch 2 inch

22G44

(US)

30G28

(CA)

44J40

(US)

81J20

(CA)

YES

Input Size

045

070

090

Vent Pipe

Dia. in.

2-1/2

Flush

Mount Kit

51W11

(US)

51W12

(CA)

YES YES

YES YES YES

2 YES YES YES

110

2-1/2 YES YES

3 YES YES

135 3 YES YES

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

calculations. See vent length tables. * Kits must be properly installed according to kit instructions.

1Requires eld-provided outdoor 1-1/2” exhaust accelerator.

2Concentric kits 71M80 and 44W92 include 1-1/2” outdoor accelerator, when used with 045 and 070 input models. 3 Flush mount kits 51W11 and 51W12 includes 1-1/2 in. outdoor exhaust accelerator, required when used with 045, 070 and 090 input models.

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

5 See table 8 for vent accelerator requirements.

Wall Ring

Kit

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)

Joint Cementing Procedure

All cementing of joints should be done according to the

specications outlined in ASTM D 2855.

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 tting socket

and result in a leaking joint.

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

3 - Clean and dry surfaces to be joined.

4 - Test t joint and mark depth of tting on outside of

pipe.

5 - Uniformly apply a liberal coat of PVC primer for

PVC or use a clean dry cloth for ABS to clean inside

socket surface of tting and male end of pipe to depth of tting socket.

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

6 - Promptly apply solvent cement to end of pipe and

inside socket surface of tting. Cement should be

applied lightly but uniformly to inside of socket. Take care to keep excess cement out of socket. Apply second coat to end of pipe.

7 - Immediately after applying last coat of cement to

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

Page 15

NOTE - Assembly should be completed within 20

Piping Suspension Guidelines

NOTE

roof in order to prevent transmission of vibration to the structure.

seconds after last application of cement. Hammer blows should not be used when inserting pipe.

8 - After assembly, wipe excess cement from pipe at

end of tting socket. A properly made joint will show

a bead around its entire perimeter. Any gaps may

indicate an improper assembly due to insufcient

solvent.

9 - Handle joints carefully until completely set.

Venting Practices

SCHEDULE 40

PVC - 5'

all other pipe* - 3'

Conduct the following test while each appliance is operating and the other appliances (which are not operating) remain connected to the common venting system. If the venting system has been installed improperly, you must correct the system as indicated in the general venting requirements 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 monoxide poisoning or death.

The following steps shall be followed for each appliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:

* See Piping and Fittings Specifications table

- Isolate piping at the point where it exits the outside wall o

Wall Thickness Guidelines

24” maximum 3/4” minimum

Wall

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 condensate 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 appliances, the venting system is likely to be too large to properly vent the remaining attached appliances.

1 - Seal any unused openings in the common venting

system.

2 - Inspect the venting system for proper size and

horizontal pitch. Determine that there is no blockage,

restriction, leakage, corrosion, or other deciencies

which could cause an unsafe condition.

3 - Close all building doors and windows and all

doors between the space in which the appliances remaining connected to the common venting system

edistuoedisni

are located and other spaces of the building. Turn on clothes dryers 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 operate at maximum speed. Do not

operate a summer exhaust fan. Close replace

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 ue gases at the draft hood relief opening. Use the ame 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,

replace dampers, and any other gas-burning

appliances to their previous mode of operation.

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

preceding tests, the common venting system must

be modied 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 standards

Page 16

appliance.

REPLACING FURNACE THAT WAS PART OF A

COMMON VENT SYSTEM

Exhaust Pipe

CHIMNEY

OR GAS

VENT

(Check sizing

for water

heater only)

WATER

FURNACE

(Replaced)

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

HEATER

OPENINGS

(To Adjacent

Room)

Figure 21

Exhaust Piping (Figure 22, Figure 24 and Figure 25)

Route piping to outside of structure. Continue with installation following instructions given in piping termination section.

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

ue gases are discharged outdoors. In Direct Vent installations, combustion air is taken from outdoors and ue 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 permitted. Table 5 lists the maximum pipe lengths permitted.

Regardless of the diameter of pipe used, the standard roof and wall terminations described in section Exhaust Piping Terminations should be used. 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 different sizes of vent pipe, a combination vent pipe may be used. Contact Lennox’ Application Department for assistance in sizing vent pipe in these applications.

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

CAUTION

Do not discharge exhaust into an existing stack or stack that also serves another gas appliance. If vertical discharge through an existing unused stack is required, insert PVC pipe inside the stack until the end is even with the top or outlet end of the metal stack.

The exhaust vent pipe operates under positive pressure and must be completely sealed to prevent leakage of combustion products into the living space.

Vent Piping Guidlines

NOTE - Lennox has approved the use of DuraVent® and Centrotherm manufactured vent pipe and terminations as an option to PVC. When using the PolyPro® by DuraVent or InnoFlue® by Centrotherm venting system the vent pipe requirements stated in the unit installation instruction – minimum & maximum vent lengths, termination clearances, etc. – apply and must be followed. Follow the instructions provided with PoyPro by DuraVent and InnoFlue by Centrotherm venting system for assembly or if requirements are more restrictive. The PolyPro by Duravent and InnoFlue by Centrotherm venting system must also follow the uninsulated

CAUTION

Exhaust Pipe

Horizontal

Gas Furnace

NOTE -

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” ma x

of straight pip

12”Min .

Figure 22

TABLE 4

MINIMUM VENT PIPE LENGTHS

EL296UHV MODEL MIN. VENT LENGTH*

045, 070, 090, 110, 135

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

15 ft. or 5 ft plus 2 elbows or

10 ft plus 1 elbow

Page 17

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.

Desired pipe size?

2”, 2-1/2”, 3”

IMPORTANT

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

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

TABLE 5

Maximum Allowable Intake or Exhaust Vent Length in Feet

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

Standard 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 81 66 44 22

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

115 115 93 58

138 137 118 118 114

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

100 100 78 43 123 122 103 103 99

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

n/a

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

n/a

80 80 58 23 103 102 83 83 79

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

Standard Termination Elevation 4500 - 10,000 ft

Number

Of 90°

Elbows

Usedl

045 070 090 11 0 135 045 070 090 11 0 135 045 070 090 11 0 135

1 81 66 44

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

115 115 93 58

138 137 118 118 11 4

2 76 61 39 110 110 88 53 133 132 11 3 113 109

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 96 73 38 118 117 98 98 94

n/a n/a

n/a

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

n/a

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

See concentric terminations next page.

80 80 58 23 103 102 83 83 79

Page 19

TABLE 5 Continued

Maximum Allowable Intake or Exhaust Vent Length in Feet

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

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” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

105 105 89 54

121 121 114 114 105

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

90 90 74 39 106 106 99 99 90

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

n/a

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

n/a

70 70 54 19 86 86 79 79 70

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

Concentric Termination Elevation 4500 - 10,000 ft

Number

Of 90°

Elbows

Usedl

045 070 090 11 0 135 045 070 090 11 0 135 045 070 090 11 0 135

1 73 58 42

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

105 105 89 54

121 121 114 114 105

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

n/a n/a

n/a

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

n/a

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

70 70 54 19 86 86 79 79 70

Page 20

TABLE 6

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

Attic or Crawl Space For Intake Air in Feet

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

NOTE - Additional vent pipe and elbows used to terminate the vent pipe outside the structure must be included in the total vent length calculation

Standard Termination at Elevation 0 - 4500 ft

Number

Of 90°

Elbows

Used

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

1 71 56 34 14

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

100 100 78 43

118 117 98 98 94

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

85 85 63 28 103 102 83 83 79

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

n/a

6 46 31 9 75 75 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

n/a

65 65 43 8 83 82 63 63 59

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

Standard Termination Elevation 4500 - 10,000 ft

Number

Of 90°

Elbows

Usedl

045 070 090 11 0 135 045 070 090 11 0 135 045 070 090 11 0 135

1 71 56 34

2” Pipe 2-1/2” Pipe 3” Pipe

Model Model Model

100 100 78 43

118 117 98 98 94

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

n/a n/a

n/a

6 46 31 9 75 75 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

n/a

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

65 65 43 8 83 82 63 63 59

Page 21

+ 46 hidden pages

Lennox EL296UH045XV36B, EL296UH110XV48C, EL296UH110XV60C, EL296UH135XV60D, EL296UH090XV48C Installation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual