Lennox EL180UHE User Manual

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INSTALLATION

 2013 Lennox Industries Inc.

Dallas, Texas, USA

UPFLOW

AIR FLOW

INSTRUCTIONS EL180UHE

ELITE® SERIES GAS FURNACE UPFLOW / HORIZONTAL AIR DISCHARGE

507138-01 01/2013

Litho U.S.A.

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

This is a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury or death.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property damage, person al injury or loss of life. Installation and service must be performed by a licensed professional installer (or equivalent), service agency or the gas supplier.

AIR FLOWAIR FLOW

HORIZONTAL LEFT HORIZONTAL RIGHT

Table of Contents

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

EL180UHE Gas Furnace 3.........................

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

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

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

General 4........................................

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

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

Filters 11..........................................

Duct System 11....................................

Venting 12........................................

CAUTION

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

Gas Piping 20.....................................

Electrical 22.......................................

Integrated Control 25...............................

Unit Start-Up 26...................................

Gas Pressure Adjustment 27........................

High Altitude 27....................................

Proper Combustion 27..............................

Other Unit Adjustments 28..........................

Service 29........................................

Repair Parts List 30................................

Start Up Check List 31..............................

01/13

*2P0113*

Page 1

507138-01

*P507138-01*

Unit Dimensions - inches (mm)

1/2

NOTE − 60C and 60D size units that require air volumes over 1800 cfm (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 one side return air.

See Blower Performance TTables for additional information.

Flue outlet may be horizontal but furnace must be vented vertically

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

A B

9/16 (14)

OPTIONAL

EXTERNAL

SIDE RETURN

AIR FILTER KIT

(Either Side)

(838)

FLUE OUTLET

(Top)

OPTIONAL

EXTERNAL

SIDE RETURN

AIR FILTER KIT

(Either Side)

1−1/2 (38)

Front Panel

3 (76) Right 7 (178) Left

9−1/8 (232) Right

8−5/8 (219) Left

5−3/8 (137) Right

2−3/4 (70) Left

3−1/8 (79)

TOP VIEW

3−1/4 (83)

FLUE OUTLET

(Either Side)

GAS PIPING INLET

(Either Side)

ELECTRICAL INLET

(Either Side)

SUPPL Y AIR

OPENING

23−3/4

(603)

(635)

27−3/4

(705)

19−7/16

(494)

3/4

(19)

EL180UHE Model No.

045(X)E36A

070(X)E36B 090(X)E48B

090E60C 110(X)E60C

135E60D

(584)

Side Return Air Opening (Either Side)

23−1/2

(597)

Bottom Return

Air Opening

AIR FLOW

Bottom Return

Air Opening

3/4

(19)

14−3/4

(375)

(16)

(406)

5/8

3−1/4

(83)

FRONT VIEW SIDE VIEW

A B C D

in. mm in. mm in. mm in. mm

14-1/2 368 13-3/8 340 13 330 4-3/4 121

17-1/2 446 16-3/8 416 16 406 6-1/4 159

21 533 19-7/8 504 19-1/2 495 8 203

24-1/2 622 23-3/8 546 23 584 9-3/4 248

(356)

1−15/16 (49)

1−

Page 2

EL180UHE Gas Furnace

The EL180UHE unit is shipped ready for installation in the upflow or horizontal right position (for horizontal left posi tion the combustion air pressure switch must be moved) fueled by natural gas. A conversion kit (ordered separate ly) is required for use in LP/Propane gas applications. The furnace is shipped with the bottom panel in place. The bot tom panel must be removed if the unit is to be installed in a horizontal application. The panel may also be removed in upflow applications.

Shipping and Packing List

Package 1 of 1 contains

1 - Assembled EL180UHE unit 1 - Bag assembly containing the following:

2 - Screws 1 - Snap bushing 1 - Snap plug 1 - Wire tie 1 - Vent warning label 1 - Owner's manual and warranty card

The following items may be ordered separately: 1 - Thermostat 1 - Suspension kit (for horizontal installations) 1 - LP/Propane changeover kit 1 - Return air base 1 - High altitude kit 1 - Side filter kit

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

Safety Information

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.

WARNING

CAUTION

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

Certifications

EL180UHE units are CSA International certified to ANSI Z21.47.

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). The National Fuel Gas Code is available from the following address:

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

Clearances

Adequate clearance must be made around the air open ings into the vestibule area. In order to ensure proper unit operation, combustion and ventilation air supply must be provided according to the current National Fuel Gas Code.

Vent installations must be consistent with the National Fuel Gas Code venting tables (in this instruction) and applicable provisions of local building codes.

This furnace is CSA International certified for installation clearances to combustible material as listed on the unit nameplate and in the tables in figures 7 and 11. Accessibility and service clearances must take precedence over fire protection 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.

Installed Locations

For installation in a residential garage, the furnace must be installed so that the burner(s) and the ignition source are located no less than 18 inches (457 mm) above the floor. The furnace must be located or protected to avoid physical damage by vehicles. When a furnace is installed in a public garage, hangar, or other building that has a haz ardous atmosphere, the furnace must be installed accord ing to recommended good practice requirements and cur rent National Fuel Gas Code.

Temperature Rise

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

This EL180UHE furnace must be installed so that its elec trical components are protected from water.

Page 3

Installed in Combination with a Cooling Coil

When this furnace is used with cooling units, it shall be installed in parallel with, or on the upstream side of, cooling units to avoid condensation in the heating compartment. See figure 1. With a parallel flow arrangement, a damper (or other means to control the flow of air) must adequately pre vent chilled air 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. See figure 1.

Heating Unit Installed Parallel to Cooling Coil

Dampers

(open during heating operation only)

Gas Unit

Cooling Coil

Dampers

(open during cooling operation only)

Heating Unit Installed Upstream of Cooling Coil

Gas Unit

Cooling Coil

FIGURE 1

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

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

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

The EL180UHE 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 International certified for installation in mobile homes, recreational vehicles, or outdoors.

Use of Furnace as Construction Heater

Lennox does not recommend the use of EL180UHE 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.

EL180UHE 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.

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 system,

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 EL180UHE furnace:

 Place the furnace as close to the center of the air dis

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

Page 4

 Do not install the furnace where drafts might blow direct

ly into it. This could cause improper combustion and un safe operation.

 Do not block the furnace combustion air openings 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.

NOTE - The Commonwealth of Massachusetts stipu lates these additional requirements:

D Gas furnaces shall be installed by a licensed plumb

er or fitter only.

D The gas cock must be “T handle” type.

D When a furnace is installed in an attic, the passage

way to and service area surrounding the equipment shall be floored.

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.

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.

CAUTION

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 combus tion 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

In the past, there was no problem in bringing in sufficient out door air for combustion. Infiltration provided all the air that was needed. In today's homes, tight construction practices make it necessary to bring in air from outside for combus tion. 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 outside 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 furnace vent pipe or chimney. As a result, combustion gases enter the liv ing space creating a potentially dangerous situation.

In the absence of local codes concerning air for combus tion and ventilation, use the guidelines and procedures in this section to install EL180UHE furnaces to ensure effi cient and safe operation. You must consider combustion air needs and requirements for exhaust vents. A portion of this information has been reprinted with permission from the National Fuel Gas Code (ANSI‐Z223.1). This reprinted ma terial is not the complete and official position of the ANSI on the referenced subject, which is represented only by the standard in its entirety.

All gas‐fired appliances require air for the combustion pro cess. If sufficient combustion air is not available, the fur nace or other appliances will operate inefficiently and un safely. Enough air must be provided to meet the needs of all fuel‐burning appliances and appliances such as exhaust fans which force air out of the house. When fireplaces, ex haust fans, or clothes dryers are used at the same time as the furnace, much more air is necessary to ensure proper combustion and to prevent a downdraft. Insufficient air causes incomplete combustion which can result in carbon monoxide.

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

The requirements for providing air for combustion and ven tilation depend largely on whether the furnace is installed in an unconfined or a confined space.

Unconfined Space

An unconfined space is an area such as a basement or large equipment room with a volume greater than 50 cubic feet (1.42 m bined input rating of all appliances installed in that space. This space also includes adjacent rooms which are not

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

Page 5

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 combined input rating of all appliances installed in that space. This definition includes furnace closets or small equipment rooms.

When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space contain ing 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 either from inside the building or from outside.

EQUIPMENT IN CONFINED

SPACE ALL AIR FROM INSIDE

CHIMNEY

OR GAS

VENT

WATER

FURNACE

HEATER

OPENINGS

(To Adjacent

Room)

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 2.

Air from Outside

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 3 and 4. 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 5.

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 operation.

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

) per 1,000 Btu (.29 kW) per hour of the total input rat

FIGURE 2

Page 6

CHIMNEY OR

GAS VENT

FURNACE

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

VENTILATION LOUVERS

(Each end of attic)

EQUIPMENT IN CONFINED SPACE

ALL AIR FROM OUTSIDE

OUTLET

AIR

WATER

HEATER

CHIMNEY

OR GAS

VENT

FURNACE

VENTILATION

LOUVERS

(For unheated crawl space)

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch (645

) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.

INLET

AIR

FIGURE 3

EQUIPMENT IN CONFINED SPACE

ALL AIR FROM OUTSIDE

(All Air Through Ventilated Attic)

VENTILATION LOUVERS

(Each end of attic)

OUTLET

AIR

INLET AIR

(Ends 12 in.

above bottom)

WATER

HEATER

FURNACE

CHIMNEY

OR GAS

VENT

WATER

HEATER

EQUIPMENT IN

CONFINED SPACE

ALL AIR FROM

OUTSIDE

OUTLET AIR

INLET AIR

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

) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equip ment in the enclosure.

FIGURE 4

Page 7

NOTE - Each air duct opening shall have a free area of at least one square inch (645 mm

) per 2,000 Btu (.59 kW) per hour of the total input rating of all equipment in the enclosure. If the equipment room is located against an outside wall and the air openings communi cate directly with the outdoors, each opening shall have a free area of at least one square inch (645 mm

) per 4,000 Btu (1.17 kW) per

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

FIGURE 5

Setting Equipment

WARNING

Do not install the furnace on its front or its back. Do not connect the return air ducts to the back of the fur nace. Doing so will adversely affect the operation of the safety control devices, which could result in per sonal injury or death.

The EL180UHE gas furnace can be installed as shipped in either the upflow position or the horizontal position.

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, and installation and service clearances [24 inches (610 mm) at unit front]. The unit must be level.

NOTE - Units with 1/2 or 3/4 hp blower motors are equipped with three flexible legs and one rigid leg. See figure 6. The rigid leg is equipped with a shipping bolt and a flat white plastic washer (rather than the rubber mounting grommet used with a flexible mounting leg). The bolt and washer

must be removed before the furnace is placed into op eration. After the bolt and washer have been removed, the

rigid leg will not touch the blower housing.

Units with 1/2 or 3/4 HP Blower Motor

RIGID LEG

remove shipping bolt and washe

FIGURE 6

Upflow Applications

Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or al cove installations are shown in figure 7.

Upflow Application Installation Clearances

Top

Left Side

Bottom

Type of Vent

Connector

Top 1 in. (25 mm) 1 in. (25 mm)

*Front 2-1/4 in. (57 mm)** 2-1/4 in. (57 mm)

Back 0 0

Sides 0† 0

Vent 6 in. (152 mm) 1 in. (25 mm)

Floor 0‡ 0‡

*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. ** 4-1/2” if single wall vent pipe is used. ‡For installation on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring. †Left side requires 3 inches if a single wall vent is used on 14-1/2 inch cabinets, or 2 inches if a single wall vent pipe is used on 17-1/2 inch cabinets.

Type C Type B1

Right Side

FIGURE 7

Page 8

Return Air -- Upflow Applications

l m)

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.

Single Side Return Air

(with transition and filter)

20” X 25” X 1”

(508mm X 635mm X 25mm)

Cleanable Filter

NOTE -

cfm (850 L/s) must have one of the following:

1 - Single side return air with transition to accommodate 20

60C and 60D units that require air volumes over 1800

Return Air

Plenum

x 25 x 1 in. (508 x 635 x 25 mm) cleanable air filter. (Re quired to maintain proper air velocity.) See figure 8.

2 - Single side return air with optional return airbase. See fig

AIR FLOW

ure 9.

3 - Bottom return air.

Transition

4 - Return air from both sides.

5 - Bottom and one side return air.

FIGURE 8

Refer to Engineering Handbook for additional information.

Optional Return Air Base

(Upflow Applications Only -- For use with A, B, C and D cabinets)

FURNACE

FRONT

IF BASE IS USED

WITHOUT

INDOOR AIR

QUALITY

AIR FLOW

14−1/2 (368) A Width (65W75) 17−1/2 (446) B Width (50W98) 21 (533) C Width (50W99) 24−1/2 (622) D Width (51W00)

NOTE- Optional Side Return Air Filter Kits are not for use with Optional 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.

CABINET

(PCO, Filter

Cabinet, etc.)

OPTIONAL RETURN AIR BASE

IAQ CABINET,

A SINGLE

RETURN AIR

PLENUM

MUST

COVER BOTH

UNIT AND

RETURN

AIR BASE

OPENINGS

3−1/4

(83)

7−1/4 (184)

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 356 mm) is preferred.

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)

(Maximu

22−7/1

(570)

Overal

3/4

(19)

FIGURE 9

Page 9

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 10.

Removing the Bottom Panel

Screw

Horizontal Applications

The EL180UHE furnace can be installed in horizontal ap plications. Order horizontal suspension kit (51W10) from Lennox, or use equivalent suspension method.

Allow for clearances to combustible materials as indicated on the unit nameplate. Minimum clearances for closet or al cove installations are shown in figure 11.

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 12, or install the furnace on a platform, as shown in figure 13.

Typical Horizontal Application

Unit Suspended in Attic or Crawlspace

Metal Strap

Bracket

3/16”

Air

Flow

Bottom Cap

Bottom Panel

FIGURE 10

Horizontal Application

Installation Clearances

Left End

Vent Connector

Type

Top 0 0

*Front 2-1/4 in. (57 mm)** 2-1/4 in. (57 mm)

Back 0 0

Ends 2 in. (51 mm) 2 in. (51 mm)

Vent 6 in. (152 mm) 1 in. (25 mm)

Floor 0‡ 0‡

*Front clearance in alcove installation must be 24 in. (610 mm). Maintain a minimum of 24 in. (610 mm) for front service access. ** 4-1/2 in. if single wall vent pipe is used. ‡For installations on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring.

Top

Right

AIR FLOW

End

Bottom

Type C Type B1

FIGURE 12

NOTE - Heavy-gauge perforated 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 pip ing installation. Cooling coils and supply and return air

plenums must be supported separately. NOTE - When the furnace is installed on a platform in a

crawlspace, it must be elevated enough to avoid water damage and to allow the evaporator coil to drain.

Return Air -- Horizontal Applications

Return air must be brought in through the end of a furnace installed in a horizontal application. The furnace is equipped with a removable bottom panel to facilitate installation. See figure 10.

FIGURE 11

Page 10

CAUTION

If this unit is being installed in 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.

Horizontal Application

Unit Installed on Platform

Line contact is permissible but not preferred

See the unit nameplate for

clearances.

GAS

ENTRY

SERVICE PLATFORM

FIGURE 13

VENT

PIPE

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 the living space. Use screws and joint tape to seal the return air system to the furnace. In platform installations with bottom return air, the furnace 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. The return and supply air duct systems must never be connected to or from other heating devices such as a fireplace or stove, etc. Fire, explosion, carbon monoxide poisoning, personal injury and/or proper ty damage could result.

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

This unit is not equipped with a filter or rack. A field-pro vided high-velocity filter is required for the unit to operate properly. Table 1 lists recommended filter sizes.

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).

A filter must be in place any time the unit is operating.

TABLE 1

Furnace

Cabinet Width

A - 14-1/2” 16 X 25 X 1 (1) 14 X 25 X 1 (1) B - 17-1/2” 16 X 25 X 1 (1) 16 X 25 X 1 (1)

C - 21” 16 X 25 X 1 (1) 20 X 25 X 1 (1)

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

Side Return Bottom Return

Duct System

Use industry‐approved standards (such as those pub lished by Air Conditioning Contractors of America or Ameri can Society of Heating, Refrigerating and Air Conditioning Engineers) to size and install the supply and return air duct system. This will result in a quiet and low‐static system that has uniform air distribution.

NOTE - Do not operate the furnace in the heating mode with an external static pressure that exceeds 0.5 inches w.c. Higher external static pressures may cause erratic lim it operation.

Supply Air Plenum

If the furnace is installed without a cooling coil, a removable access panel must be installed in the supply air duct. The access panel should be large enough to permit inspection (either by smoke or reflected light) of the heat exchanger for leaks after the furnace is installed. The furnace access panel must always be in place when the furnace is operat ing and it must not allow leaks into the supply air duct sys tem.

Filter Size

Page 11

Return Air Plenum

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

When return air is drawn from a room, a negative pres sure is created in the room. If a gas appliance is operating in a room with negative pressure, the flue products can be pulled back down the vent pipe and into the room. This re verse flow of th e flu e gas may result in incompl ete com bustion and the formation of carbon monoxide gas. This toxic gas might then be distributed throughout the house by the furnace duct system.

In upflow applications, the return air can be brought in through the bottom or either side of the furnace. If a fur nace 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 fiberglass sealing strips, caulking, or equiva lent sealing method between the plenum and the furnace cabinet to ensure a tight seal. If a filter is installed, size the return air duct to fit the filter frame.

Venting

A 4-inch diameter flue transition is factory‐installed on the combustion air inducer outlet of all models. Figure 15

shows the combustion air inducer as shipped from the factory.

Mounting Screws Location

Flue Transition

Mounting Screws

UPFLOW POSITION

Top Vent Discharge

Vent Pipe

Collector Box

FLOW

Pressure

Switch

Make-Up

Box

Flue

Transition

AIR

FIGURE 15

IMPORTANT

The unit will not vent properly with the flue transition pointed down in the 6 o'clock position. The combustion air inducer may be rotated clock wise or counterclockwise by 90° to allow for top or side vent discharge in all applications. When the unit is installed, the flue transition must be in the 9 o'clock, 12 o'clock or 3 o'clock position.

FIGURE 14

If necessary, reposition the combustion air inducer, pres sure switch and/or make-up box as needed per the follow ing steps. See figures 16 through 20.

1 - Remove the four mounting screws (figure 14) which

secure the combustion air inducer / pressure switch assembly to the orifice plate. Lift the assembly and ro tate it 90 degrees clockwise or counterclockwise to ei ther the 3 o'clock position or to 9 o'clock position. Resecure with four screws. Gasket should be left in place.

2 - Use tin snips to cut preferred opening on the cabinet

for repositioning the flue outlet. Use the cut-out piece as a cover plate to patch unused opening on cabinet.

Page 12

Pressure

Switch

Vent Pipe

Cover Plate

UPFLOW POSITION

Left Side Vent Discharge

Collector Box

Make-Up

Box

Vent Pipe

Pressure

Switch

HORIZONTAL LEFT POSITION

Top Vent Discharge

Flue

Transition

FLOW

AIR

 Gas supply piping must be brought into the unit from the right

side in order to accommodate the flue pipe.

 Cut Combustion air inducer tubing from 9” to 8” to avoid inter

ference with inducer motor

 Remove make-up box assembly (2 screws) and cut wire tie to

free make-up box wires. Re-install make-up box on other side of cabinet.

 Re-secure make-up box wires: Either pull excess wires

through the blower compartment and secure using supplied wire tie, or coil excess wire and secure to the gas manifold.

FIGURE 16

UPFLOW POSITION

Right Side Vent Discharge

Collector Box

Pressure

Switch

Cover Plate

Flue Transition

Vent Pipe

Flue

Transition

Cover Plate

Make-Up Box

 Disconnect pressure switch hose from barbed fitting on the

pressure switch assembly. Remove pressure switch assembly (1 screw) and cut wire tie to free pressure switch wires. Reinstall pressure switch on the other side of orifice plate and reconnect pressure switch hose.

 Re-secure pressure switch wires: Either pull excess wires

through the blower compartment and secure using supplied wire tie, or coil excess wire and secure to the gas manifold.

AIR

FLOW

Collector Box

FIGURE 18

HORIZONTAL LEFT POSITION

Side Vent Discharge

Pressure Switch

FLOW

AIR

Make-Up

Box

FLOW

AIR

 Cut combustion air inducer tubing from 9” to 5” to avoid

interference with inducer motor

FIGURE 17

Page 13

Vent Pipe

Make-Up Box

 Cut combustion air inducer tubing from 9” to 7” to avoid inter

ference with inducer motor

 Disconnect pressure switch hose from barbed fitting on the

 Re-secure pressure switch wires: Either pull excess wires

through the blower compartment and secure using supplied wire tie, or coil excess wire and secure to the gas manifold.

Collector Box

FIGURE 19

HORIZONTAL RIGHT POSITION

Top Vent Discharge

Vent Pipe

Pressure Switch

Flue

Transition

AIR

FLOW

 Gas supply piping must be brought into the unit from the bot

tom in order to accommodate the flue pipe.

 Cut combustion air inducer tubing from 9” to 8” to avoid inter

ference with inducer motor

 Remove make-up box assembly (2 screws) and cut wire tie to

free make-up box wires. Re-install make-up box on other side of cabinet.

 Re-secure make-up box wires: Either pull excess wires through

the blower compartment and secure using supplied wire tie, or coil excess wire and secure to the gas manifold.

Cover Plate

Collector Box

Make-Up Box

FIGURE 20

HORIZONTAL RIGHT POSITION

Side Vent Discharge - no modifications necessary

Make-Up Box

AIR

FLOW

Pressure Switch

Vent Pipe

Flue Transition

nace is an appliance equipped with an integral mechanical means to either draw or force combustion products through the combustion chamber and/or heat exchanger. The EL180UHE is not approved for use with horizontal venting.

NOTE - Use these instructions as a guide. They do not su persede local codes. This furnace must be vented accord ing to all local codes these installation instructions, and the provided venting tables in these instructions

The venting tables in this manual were extracted from the National Fuel Gas Code (NFPA 54 / ANSI Z223.1) and are provided as a guide for proper vent installation. Proper ap plication, termination, construction and location of vents must conform to local codes having jurisdiction. In the ab sence of local codes, the NFGC serves as the defining doc ument. Use self-drilling sheet metal screws or a mechanical fas tener to firmly secure the vent pipe to the round collar of the flue transition. If self-drilling screws are used to attach the vent pipe, it is recommended that three be used. Drive one self-drilling screw through the front and one through each side of the vent pipe and collar. See figure 22. Install the first vent connector elbow at a minimum of six inches (152 mm) from the furnace vent outlet. See figure

22.

Venting Using a Masonry Chimney

The following additional requirements apply when a lined masonry chimney is used to vent this furnace.

Masonry chimneys used to vent Category I central fur naces must be either tile‐lined or lined with a listed metal lining system or dedicated gas vent. Unlined masonry chimneys are prohibited. See figures 23 and 24 for com mon venting.

A chimney with one or more sides exposed to the outside of the structure is considered to be an exterior chimney.

An exterior masonry chimney that is not tile-lined must be lined with B1 vent or a listed insulated flexible metal vent. An exterior tile-lined chimney that is sealed and capped may be lined with a listed uninsulated flexible metal vent.

If the existing chimney will not accommodate a listed metal liner, either the chimney must be rebuilt to accommodate one of these liners or an alternate approved venting meth od must be found.

Insulation for the flexible vent pipe must be an encapsu lated fiberglass sleeve recommended by the flexible vent pipe manufacturer. See figure 23.

Refer to the tables and the venting information contained in these instructions to properly size and install the venting system.

Collector Box

FIGURE 21

The EL180UHE series units are classified as fan-assisted Category I furnaces when vertically vented according to the latest edition of National Fuel Gas Code (NFPA 54 / ANSI Z223.1) in the USA. A fan-assisted Category I fur

IMPORTANT

Once the venting system is installed, attach the “Dis connected Vent” warning sticker to a visible area of the plenum near the vent pipe. See figure 22. The warning sticker is provided in the bag assembly. Or der kit 66W04 for additional stickers.

Page 14

VENT PIPE

(min. 6” length)

FLUE TRANSITION

COLLAR

VENT CONNECTION UPFLOW AND HORIZONTAL POSITION

“DISCONNECTED VENT”

WARNING

STICKER

“DISCONNECTED VENT”

WARNING

STICKER

VENT PIPE

(min. 6” length)

FIGURE 22

FLUE

TRANSITION

COLLAR

Common Venting Using Metal-Lined Masonry Chimney

SEALED

MAX. LENGTH

-- SEE NOTE 1

5 ft. (1.5 m)

minimum

VENT CONNECTOR

4 in. (102 mm)

minimum

OTHER

APPLIANCE

NOTE 1 - Refer to the provided venting tables for installations. Refer to the capacity requirements shown in the provided venting tables.

BELOW.

MIN. LENGTH -- AS

SHORT AS PRACTICAL

FURNACE

EXTERIOR

CHIMNEY WITH

METAL

LINER

PERMANENTLY

SEALED FIREPLACE

OPENING

FIGURE 23

WARNING

Asphyxiation hazard. The exhaust vent for this fur nace must be securely connected to the furnace flue transition at all times.

DO NOT insulate the space between the liner and the chimney wall with puffed mica or any other loose gran ular insulating material.

IMPORTANT

SINGLE appliance venting of a fan‐assisted furnace into a tile‐lined masonry chimney (interior or outside wall) is PROHIBITED. The chimney must first be lined with either type B1 vent or an insulated single wall flexible vent lining system which has been sized ac cording to the provided venting tables and the vent pipe manufacturer's instructions.

A fan-assisted furnace may be commonly vented into an existing lined masonry chimney if the following conditions are met:

 The chimney is currently serving at least one drafthood-

equipped appliance;

 The vent connectors and chimney are sized according

to the provided venting tables.

If type B1 double‐wall vent is used inside a chimney, no oth er appliance can be vented into the chimney. The outer wall of type B1 vent pipe must not be exposed to flue products.

A type B1 vent or masonry chimney liner shall terminate above the roof surface with a listed cap or a listed roof as sembly according to the terms of their respective listings and the vent manufacturer's instructions.

When inspection reveals that an existing chimney is not safe for the intended purpose, it shall be rebuilt to conform to nationally recognized standards, lined or relined with suitable materials, or replaced with a gas vent or chimney suitable for venting EL180UHE series units. The chimney passageway must be checked periodically to ensure that it is clear and free of obstructions.

Do not install a manual damper, barometric draft regulator, or flue restrictor between the furnace and the chimney.

Never connect a Category I appliance to a chimney that is servicing a solid-fuel appliance. If a fireplace chimney flue is used to vent this appliance, the fireplace opening must be permanently sealed.

Page 15

A type B or listed chimney lining system that passes through an unused masonry chimney flue is not considered to be exposed to the outdoors.

General Venting Requirements

Vent all EL180UHE furnaces according to these instruc tions:

1 - Vent diameter recommendations and maximum allow

able piping runs are found in the provided venting tables.

2 - In no case should the vent or vent connector diameter

be less than the diameter specified in the provided venting tables.

3 - The minimum vent capacity determined by the sizing

tables must be less than the low fire input rating and the maximum vent capacity must be greater than the high fire input rating.

4 - Single appliance vents - If the vertical vent or tile‐lined

chimney has a larger diameter or flow area than the vent connector, use the vertical vent diameter to de termine the minimum vent capacity and the vent

connector diameter to determine the maximum vent capacity. The flow area of the vertical vent, however,

shall not exceed 7 times the flow area of the listed ap pliance categorized vent area, drafthood outlet area or flue collar area unless designed according to approved engineering methods.

5 - Multiple appliance vents - The flow area of the largest

section of vertical vent or chimney shall not exceed 7 times the smallest listed appliance categorized vent area, drafthood outlet area or flue collar area unless de signed according to approved engineering methods.

6 - The entire length of single wall metal vent connector

shall be readily accessible for inspection, cleaning, and replacement.

7 - Single appliance venting configurations with zero lat

eral lengths (table 3) are assumed to have no elbows in the vent system. For all other vent configurations, the vent system is assumed to have two 90° elbows. For each additional 90° elbow or equivalent (for example two 45° elbows equal one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10% (0.90 x maximum listed capacity).

8 - The common venting tables (4 and 5) were generated

using a maximum horizontal vent connector length of 1-1/2 feet (.46 m) for each inch (25 mm) of connector diameter as follows:

TABLE 2

Connector Diameter

inches (mm)

3 (76) 4-1/2 (1.37)

4 (102) 6 (1.83)

5 (127) 7-1/2 (2.29)

6 (152) 9 (2.74)

7 (178) 10-1/2 (3.20)

Maximum Horizontal

Connector Length feet (m)

Common Venting Using Tile-Lined Interior Masonry Chimney and Combined Vent Connector

NOTE- Refer to provided venting tables for installations.

MINIMUM LENGTH = AS SHORT AS PRACTICAL. FOR MAXIMUM LENGTH SEE NOTE TO LEFT

OTHER

APPLIANCE

FURNACE

FIGURE 24

VENT

CONNECTOR

INTERIOR TILE-LINED MASONRY CHIMNEY

NOTE - the chimney must be properly sized per provided venting tables or lined with listed metal lining system.

PERMANENTLY SEALED FIREPLACE OPENING

Page 16

9 - If the common vertical vent is offset, the maximum

common vent capacity listed in the common venting tables should be reduced by 20%, the equivalent of two 90° elbows (0.80 x maximum common vent capacity). The horizontal length of the offset shall not exceed 1‐1/2 feet (.46 m) for each inch (25 mm) of common vent diameter.

10 - The vent pipe should be as short as possible with the

least number of elbows and angles required to com plete the job. Route the vent connector to the vent us ing the shortest possible route.

11 - A vent connector shall be supported without any dips

or sags and shall slope a minimum of 1/4 inch (6.4 mm) per linear foot (305 mm) of connector, back toward the appliance.

12 - Vent connectors shall be firmly attached to the furnace

flue collar by self-drilling screws or other approved means, except vent connectors of listed type B vent material which shall be assembled according to the manufacturer's instructions. Joints between sections of single wall connector piping shall be fastened by screws or other approved means.

13 - When the vent connector used for Category I ap

pliances must be located in or pass through a crawl space, attic or other areas which may be cold, that por tion of the vent connector shall be constructed of listed double‐wall type B vent material or material having equivalent insulation qualities.

14 - All venting pipe passing through floors, walls, and ceil

ings must be installed with the listed clearance to com bustible materials and be fire stopped according to lo cal codes. In absence of local codes, refer to NFGC (Z223.1).

15 - No portion of the venting system can extend into, or pass

through any circulation air duct or plenum.

16 - Vent connectors serving Category I appliances shall

not be connected to any portion of mechanical draft systems operating under positive pressure such as Category III or IV venting systems.

17 - If vent connectors are combined prior to entering the

common vent, the maximum common vent capacity listed in the common venting tables must be reduced by 10%, the equivalent of one 90° elbow (0.90 x maximum common vent capacity).

18 - The common vent diameter must always be at least as

large as the largest vent connector diameter.

19 - In no case, shall the vent connector be sized more than

two consecutive table size diameters over the size of the draft hood outlet or flue collar outlet.

20 - Do not install a manual damper, barometric draft regu

lator or flue restrictor between the furnace and the chimney.

21 - When connecting this appliance to an existing dedi

cated or common venting system, you must inspect the venting system's general condition and look for signs of corrosion. The existing vent pipe size must conform to these instructions and the provided venting tables. If the existing venting system does not meet these re quirements, it must be resized.

Page 17

TABLE 3

Capacity of Type B Double-Wall Vents with Type B Double-Wall Connectors

Serving a Single Category I Appliance

Vent and Connector Diameter - D (inches)

Height

(feet)

NOTE - Single appliance venting configurations with zero lateral lengths are assumed to have no elbows in the vent system. For all other vent configurations, the vent system is assumed to have two 90° elbows. For each additional 90° elbow or equivalent (for example two 45° elbows equal one 90° elbow) beyond two, the maximum capacity listed in the venting table should be reduced by 10 percent (0.90 x maxi mum listed capacity).

Lateral

(feet)

0 0 78 0 152 0 251 0 375

2 13 51 18 97 27 157 32 232

4 21 49 30 94 39 153 50 227

6 25 46 36 91 47 149 59 223

0 0 84 0 165 0 276 0 415

2 12 57 16 109 25 178 28 263

5 23 53 32 103 42 171 53 255

8 28 49 39 98 51 164 64 247

0 0 88 0 175 0 295 0 447

2 12 61 17 11 8 23 194 26 289

5 23 57 32 11 3 41 187 52 280

10 30 51 41 104 54 176 67 267

0 0 94 0 191 0 327 0 502

2 11 69 15 136 20 226 22 339

5 22 65 30 130 39 219 49 330

10 29 59 40 121 51 206 64 315

15 35 53 48 112 61 195 76 301

0 0 97 0 202 0 349 0 540

2 10 75 14 149 18 250 20 377

5 21 71 29 143 38 242 47 367

10 28 64 38 133 50 229 62 351

15 34 58 46 124 59 217 73 337

20 48 52 55 116 69 206 84 322

0 0 100 0 213 0 374 0 587

2 9 81 13 166 14 283 18 432

5 21 77 28 160 36 275 45 421

10 27 70 37 150 48 262 59 405

15 33 64 44 141 57 249 70 389

20 56 58 53 132 66 237 80 374

30 NA NA 73 11 3 88 214 104 346

3 Inch 4 Inch 5 Inch 6 Inch

Appliance Input Rating in Thousands of Btu Per Hour

MIN MAX MIN MAX MIN MAX MIN MAX

Page 18

Vent

Height

(feet)

TABLE 4

Vent Connector Capacity

Type B Double-Wall Vents with Type B Double-Wall Connectors

Serving Two or More Category I Appliances

Connector

Rise

(feet)

1 22 37 35 66 46 106 58 164

2 23 41 37 75 48 121 60 183

3 24 44 38 81 49 132 62 199

1 22 40 35 72 49 114 64 176

2 23 44 36 80 51 128 66 195

3 24 47 37 87 53 139 67 210

1 22 43 34 78 49 123 65 189

2 23 47 36 86 51 136 67 206

3 24 50 37 92 52 146 69 220

1 21 50 33 89 47 142 64 220

2 22 53 35 96 49 153 66 235

3 24 55 36 102 51 163 68 248

1 21 54 33 99 46 157 62 246

2 22 57 34 105 48 167 64 259

3 23 60 35 11 0 50 176 66 271

1 20 62 31 11 3 45 181 60 288

2 21 64 33 11 8 47 190 62 299

3 22 66 34 123 48 198 64 309

3 Inch 4 Inch 5 Inch 6 Inch

MIN MAX MIN MAX MIN MAX MIN MAX

Vent and Connector Diameter - D (inches)

Appliance Input Rating in Thousands of Btu Per Hour

TABLE 5

Common Vent Capacity

Type B Double-Wall Vents with Type B Double-Wall Connectors

Serving Two or More Category I Appliances

Vent

Height

(feet)

6 92 81 140 116 204 161 309 248

8 101 90 155 129 224 178 339 275

10 110 97 169 141 243 194 367 299

15 125 112 195 164 283 228 427 352

20 136 123 215 183 314 255 475 394

30 152 138 244 210 361 297 547 459

FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT FAN + FAN FAN + NAT

4 Inch 5 Inch 6 Inch 7 Inch

Appliance Input Rating in Thousands of Btu Per Hour

Common Vent Diameter - D (inches)

Page 19

Removal of the Furnace from Common Vent

In the event that an existing furnace is removed from a venting system commonly run with separate gas ap pliances, the venting system is likely to be too large to properly vent the remaining attached appliances.

Conduct the following test while each appliance is operat ing and the other appliances (which are not operating) re main connected to the common venting system. If the venting system has been installed improperly, you must correct the system as indicated in the general venting re quirements section.

WARNING

CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each

appliance connected to the venting system being placed into operation could result in carbon mon oxide poisoning or death. The following steps shall be followed for each ap pliance connected to the venting system being placed into operation, while all other appliances connected to the venting system are not in operation:

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

tem.

2 - Inspect the venting system for proper size and horizontal

pitch. Determine that there is no blockage, restriction, leakage, corrosion, or other deficiencies which could cause an unsafe condition.

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

tween the space in which the appliances remaining connected to the common venting system are located and other spaces of the building. Turn on clothes dry ers and any appliances not connected to the common venting system. Turn on any exhaust fans, such as range hoods and bathroom exhausts, so they will oper ate at maximum speed. Do not operate a summer ex haust fan. Close fireplace dampers.

4 - Follow the lighting instructions. Turn on the appliance

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

5 - After the burner have 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.

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.

Gas Supply

1 - This unit is shipped standard for left or right side instal

lation of gas piping (or top entry in horizontal applica tions). Connect the gas supply to the piping assembly.

2 - When connecting the gas supply piping, consider fac

tors such as length of run, number of fittings, and fur nace rating to avoid excessive pressure drop. Table 6 lists recommended pipe sizes for typical applications.

3 - The gas piping must not run in or through air ducts,

clothes chutes, gas vents or chimneys, dumb waiters, or elevator shafts.

4 - The piping should be sloped 1/4 inch (6.4 mm) per 15

feet (4.57 m) upward toward the meter from the fur nace. The piping must be supported at proper intervals [every 8 to 10 feet (2.44 to 3.01 m)] with suitable hang ers or straps. Install a drip leg in vertical pipe runs to the unit.

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 31.

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

a manual main shut‐off valve and union (furnished by the installer) external to the unit. The 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.

NOTE - If emergency shutoff is necessary, shut off the main manual gas valve and disconnect main power to the fur nace. The installer should properly label these devices.

Page 20

TABLE 6

Gas Pipe Capacity - ft

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 (m3 ) 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)

(2.29)

170

(4.81)

320

(9.06)

657

(18.60)

985

(27.89)

1900

(53.80)

3020

(85.51)

5350

(151.49)

/hr (m3/hr)

Length of Pipe - feet (m)

(2.03)

151

(4.28)

284

(8.04)

583

(16.50)

873

(24.72)

1680

(47.57)

2680

(75.88)

4740

(134.22)

(1.84)

137

(3.87)

257

(7.27)

528

(14.95)

791

(22.39)

1520

(43.04)

2480

(70.22)

4290

(121.47)

(1.69)

126

(3.56)

237

(6.71)

486

(13.76)

728

(20.61)

1400

(39.64)

2230

(63.14)

3950

(111.85)

(1.58)

117

(3.31)

220

(6.23)

452

(12.79)

677

(19.17)

1300

(36.81)

2080

(58.89)

3670

(103.92)

(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)

MANUAL

MAIN SHUT-OFF

VALV E

(With 1/8 in. NPT

Plugged Tap Shown)

GROUND

JOINT

UNION

Left Side Piping

(Standard)

DRIP LEG

AUTOMATIC

GAS VALVE

FIELD

PROVIDED

AND INSTALLED

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

GAS VALVE

FIGURE 25

MANUAL

MAIN SHUT-OFF

VALV E

(With 1/8 in. NPT

Plugged Tap

Shown)

GROUND

JOINT UNION

DRIP LEG

Right Side Piping

(Alternate)

Page 21

MANUAL

MAIN SHUT-OFF

VALV E

GROUND

JOINT

UNION

DRIP LEG

Horizontal Application

Right-Side Air Discharge

Horizontal Applications

Possible Gas Piping Configurations

MANUAL

MAIN SHUT-OFF

VALV E

GROUND

JOINT UNION

DRIP LEG

FIELD

PROVIDED

AND INSTALLED

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

Horizontal Application

Left-Side Air Discharge

MANUAL

MAIN SHUT-OFF

VALV E

GROUND

JOINT

UNION

DRIP LEG

FIGURE 26

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.

NOTE - If emergency shutoff is necessary, shut off the main manual gas valve and disconnect the main power to the furnace. The installer should properly label these devices.

CAUTION

Some soaps used for leak detection are corrosive to certain metals. Carefully rinse piping thoroughly af ter leak test has been completed. Do not use matches, candles, flame or other sources of ignition to check for gas leaks.

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

IMPORTANT

When testing pressure of gas lines, gas valve must be disconnected and isolated. See figure 27. Gas valves can be damaged if subjected to pressures greater than 1/2 psig (3.48 kPa, 14 inches w.c.).

MANUAL MAIN

SHUT-OFF VALVE

WILL NOT HOLD

NORMAL TEST

PRESSURE

1/8 NPT PLUG

ISOLATE

GAS VALVE

FURNACE

CAP

FIGURE 27

Electrical

ELECTROSTATIC DISCHARGE (ESD)

Precautions and Procedures

CAUTION

Electrostatic discharge can affect elec tronic components. Take precautions to neutralize electrostatic charge by touching your hand and tools to metal prior to handling the control.

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.

Page 22

INTERIOR MAKE-UP BOX INSTALLATION

Right Side

BOX

FIGURE 28

Refer to figure 29 for schematic wiring diagram, field wiring and trouble shooting.

The power supply wiring must meet Class I restrictions. Protected by either a fuse or circuit breaker, select circuit protection and wire size according to unit nameplate.

NOTE - Unit nameplate states maximum current draw. Maximum over-current protection allowed is 15 AMP.

Holes are on both sides of the furnace cabinet to facilitate wiring.

Install a separate (properly sized) disconnect switch near the furnace so that power can be turned off for servicing.

Before connecting the thermostat, check to make sure the wires will be long enough for servicing at a later date. Make sure that thermostat wire is long enough to facilitate future removal of blower for service.

Complete the wiring connections to the equipment. Use the provided unit wiring and field wiring diagram shown in fig ure 29. Use 18-gauge wire or larger that is suitable for Class II rating for thermostat connections.

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

NOTE - The EL180UHE furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.

Accessory Terminals

One line voltage “EAC” 1/4” spade terminal is provided on the furnace integrated control. See figure 30 for integrated control configuration. This terminal is energized when the indoor blower is operating. Any accessory rated up to one

amp can be connected to this terminal with the neutral leg of the circuit being connected to one of the provided neutral terminals. If an accessory rated at greater than one amp is connected to this terminal, it is necessary to use an exter nal relay.

One line voltage “HUM” 1/4” spade terminal is provided on the furnace integrated control. See figure 30 for integrated control configuration. This terminal is energized in the heating mode when the combustion air inducer is operat ing. Any humidifier rated up to one amp can be connected to this terminal with the neutral leg of the circuit being con nected to one of the provided neutral terminals. If a humidi fier rated at greater than one amp is connected to this termi nal, it is necessary to use an external relay relay.

One 24V ”H” 1/4” spade terminal is provided on the furnace integrated control. See figure 30 for integrated control con figuration. The terminal is energized in the heating mode when the combustion air inducer is operating and the pres sure switch is closed. Any humidifier rated up to 0.5 amp can be connected to this terminal with the ground leg of the circuit connected to ground or the ”C” terminal.

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 +

10% (Range: 108

volts to 132 volts).

 The furnace operates at 60 Hz +

5% (Range: 57 Hz to

63 Hz).

 The furnace integrated control requires both polarity

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

 Generator should have a wave form distortion of less

than 5% total harmonic distortion.

Thermostat

Install the room thermostat according to the instructions provided with the thermostat. See figure 29 for thermostat designations. If the furnace is being matched with a heat pump, refer to the FM21 installation instruction or appropri ate dual fuel thermostat instructions.

Indoor Blower Speeds

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

blower will run continuously on the fan speed when there is no cooling or heating demand.

2 - When the EL180UHE is running in the heating mode,

the indoor blower will run on the heating speed.

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

run on the cooling speed.

Page 23

EL180UHE Schematic Wiring Diagram

FIGURE 29

Page 24

Integrated Control

RED LED

Flash Code

Diagnostic Codes / Status of Furnace

Off No power to control or board fault detected

On Board fault detected,

Heartbeat

Control powered - displayed during all modes of operation if no errors are detected

1 Reverse Line Voltage Polarity

2 Improper Earth Ground

3 Burner failed to light, or lost flame during heat demand

4 Low Flame Signal - check flame sensor

5 Watchguard - burner failed to light, exceeded maximum number of retries or recycles.

6 Not Used

7 Primary or Secondary Limit Open or Watchguard Mode - Limit Switch Open longer than 3 minutes

8 Rollout Switch Open

9 Pressure Switch failed to close or opened during heat demand

10 Watchguard - Pressure Switch opened 5 times during one heat demand

11 Pressure Switch stuck closed prior to activation of combustion air inducer

12 Flame Sensed without gas valve energized

13 Low Line Voltage

Notes

Note 1 A ”Heartbeat” is indicated by a ”Slow Flash” - 1 sec on 1 sec off, repeating

Note

Error codes are indicated by a ”Rapid Flash” - the LED flashes X times at 1/2 sec on 1/2 sec off, remains off for 3 sec, then repeats

Last 10 error codes are stored in memory including when power is shut off to the unit. - To recall, press

Note

and release button, most recent will be displayed first, LED off for 3 sec, then next error code is displayed, etc. To clear error codes, depress and hold button longer than 5 seconds.

INTEGRATED CONTROL

(Automatic Hot Surface Ignition System)

RED LED

RECALL BUTTON

BLOWER OFF DELAY

FIGURE 30

TABLE 7

1/4” QUICK CONNECT TERMINALS

120HUM Humidifier 120VAC

LINE 120VAC

XFMR Transformer 120VAC

CIRC Indoor blower 120VAC

EAC Indoor air quality accessory 120VAC

NEUTRALS Common 120VAC

HUM24 Humidifier 24VAC

3/16” QUICK CONNECT TERMINALS

COOL Cooling tap 24VAC

HEAT Heating tap 24VAC

FAN Continuous blower 24 VAC

PARK (no power) Park terminal for speed taps

FLAME/FS Flame sense

24 COM Common 24VAC

Page 25

Unit Start-Up

FOR YOUR SAFETY READ BEFORE LIGHTING

WARNING

Do not use this furnace if any part has been under water. A flood-damaged furnace is extremely dan gerous. Attempts to use the furnace can result in fire or explosion. Immediately call a qualified ser vice technician to inspect the furnace and to replace all gas controls, control system parts, and electrical parts that have been wet or to replace the furnace, if deemed necessary.

WARNING

If overheating occurs or if gas supply fails to shut off, shut off the manual gas valve to the appliance before shutting off 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 smell all around the appliance 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 EL180UHE unit is equipped with a gas control switch. Use only your hand to move the switch. Never use tools. If the switch will not turn or if the control switch will not move by hand, do not try to repair it.

Placing the furnace into operation:

EL180UHE units are equipped with an automatic ignition system. Do not attempt to manually light burners on these furnaces. 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 units with an automatic ignition system.

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 31)

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 upper access panel. 6 - Move switch on gas valve to OFF. Do not force. See

figure 31.

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.

MANIFOLD

PRESSURE

ADJUSTMENT

SCREW

INLET

PRESSURE

PORT

8 - Move switch on gas valve to ON. Do not force. See fig

ure 31.

9 - Replace the upper 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 upper access panel. 4 - Move switch on gas valve to OFF. Do not force. 5 - Replace the upper 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 circuit 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 lock out? If the unit locks out

again, call the service technician to inspect the unit for

blockages. 10 - Is pressure switch closed? Obstructed flue will cause

unit to shut off at pressure switch. Check flue and outlet

for blockages.

GAS VALVE SHOWN IN ON POSITION

FIGURE 31

MANIFOLD

PRESSURE

OUTLET

PORT

Page 26

11 - Are flame rollout switches tripped? If flame rollout

switches are tripped, call the service technician for in spection.

Heating Sequence Of Operation (follow steps below or see Figure 29 for more detail)

1 - When thermostat calls for heat, combustion air blower

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.

7 - 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 8

GAS METER CLOCKING CHART

Seconds for One Revolution

EL180UHE 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

Furnace should operate at least 5 minutes before check ing gas flow. Determine time in seconds for two revolu tions of gas through the meter. (Two revolutions assures a more accurate time.) Divide by two and compare to time in table 8. If manifold pressure matches table 10 and rate is incorrect, check gas orifices for proper size and restric tion. Remove temporary gas meter if installed.

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

Natural LP

1 cu ft

Dial

2 cu ft

Dial

1 cu ft

Dial

2 cu ft

DIAL

Supply Pressure Measurement

A threaded plug on the inlet side of the gas valve provides access to the supply pressure tap. Remove the threaded plug, install a field-provided barbed fitting and connect a manometer to measure supply pressure. See table 10 for proper line pressure. Replace the threaded plug after mea surements have been taken.

Manifold Pressure Measurement

1 - Remove the threaded plug from the outlet side of the

gas valve and install a field-provided barbed fitting. Connect to a manometer to measure manifold pres sure.

2 - Start unit and allow 5 minutes for unit to reach steady

state.

3 - While waiting for the unit to stabilize, observe the

flame. Flame should be stable and should not lift from burner. Natural gas should burn blue.

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

manifold pressure and compare to value given in table

10.

NOTE - Shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to remove barbed fitting and replace threaded plug.

Proper Combustion

Furnace should operate a minimum 15 minutes with cor rect manifold pressure and gas flow rate before checking combustion. Take combustion sample beyond the flue out let and compare to the tables below. The maximum car

bon monoxide reading should not exceed 50 ppm.

TABLE 9

EL180UHE Unit

-045

-070

-090

-110

-135

CO2%

For

Nat

7.2 - 7.8 7.5 - 9.0

CO2%

L.P.

For

High Altitude

The manifold pressure may require adjustment and com bustion air pressure switch may need replacing to ensure proper combustion at higher altitudes. Refer to table 10 for manifold pressure and table 11 for pressure switch change and gas conversion kits.

IMPORTANT

For safety, shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to replace pressure tap plug.

Page 27

TABLE 10

Manifold Pressure Settings at all Altitudes

Model

Input Size

045

070

090

110

135

Gas 0-2000 ft 2001-4500 ft. 4501-7500 ft 7501 - 10,000 ft

Nat 3.5 3.2 3.0 3.5 4.5 13.0

LP/propane 10.0 10.0 10.0 10.0 11.0 13.0

Nat 3.5 3.2 2.8 3.5 4.5 13.0

LP/propane 10.0 10.0 10.0 10.0 11.0 13.0

Nat 3.5 3.2 2.7 3.5 4.5 13.0

LP/propane 10.0 10 9.6 10.0 11.0 13.0

Nat 3.5 3.5 3.0 3.5 4.5 13.0

LP/propane 10.0 10.0 9.6 10.0 11.0 13.0

Nat 3.5 3.5 2.9 3.5 4.5 13.0

LP/propane 10.0 10.0 9.6 10.0 11.0 13.0

Pressure Switch and Gas Conversion Kits at all Altitudes

Model

Input Size

045

070 80W52 80W51

090 80W52 80W51

110 80W57 80W52

135 80W52 80W51

High Altitude Pressure Switch Kit

0-4500 ft 4501-7500 ft 7501 - 10,000 ft 7501 - 10,000 ft 0 - 7500 ft 7501 - 10,000 ft 0 - 7500 ft

80W52 80W51

No Change

TABLE 11

High Altitude

Natural Gas Burner

Orifice Kit

73W37 70W89 76W15 73W81

Natural Gas to LP/Propane

Burner Orifice Kit

Line Pressure in.wg.

Min Max

LP/Propane to

Natural Gas Burner

Orifice Kit

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.

Other Unit Adjustments

air temperatures have been allowed to stabilize, check the temperature rise. If necessary, adjust the blower speed to

Primary and Secondary Limits

The primary limit is located on the heating compartment vestibule panel. The secondary limits (if equipped) are lo cated in the blower compartment, attached to the back side of the blower. These auto reset limits are factory-set and re quire no adjustment.

Flame Rollout Switches

These manually reset switches are located on the burner box.

Pressure Switch

The pressure switch is located in the heating compartment adjacent to the combustion air inducer. The switch checks for proper combustion air inducer operation before allow ing ignition trial. The switch is factory-set and requires no adjustment.

Temperature Rise

After the furnace has been started, and supply and return

maintain the temperature rise within the range shown on the unit nameplate. Increase the blower speed to decrease the temperature. Decrease the blower speed to increase the temperature rise. Failure to adjust the temperature rise may cause erratic limit operation.

Fan Control

The heat fan-on time of 30 seconds is not adjustable. The heat fan-off delay (amount of time that the blower operates after the heat demand has been satisfied) may be adjusted by changing the jumper position across the five pins on the integrated control. The unit is shipped with a factory fan-off delay setting of 90 seconds. The fan-off delay affects com fort and is adjustable to satisfy individual applications. Ad just the fan-off delay to achieve a supply air temperature between 90° and 110°F at the moment that the blower is de-energized. Longer off delay settings provide lower re turn air temperatures; shorter settings provide higher re turn air temperatures. See figure 32.

Page 28

HEAT FAN‐OFF TIME IN SECONDS

NO JUMPER

To adjust fan-off timing, reposition jumper across pins to

60 Second

off Time

120

180

achieve desired setting.

90 Second

off Time

120

180

120 Second

off Time

120

180

180 Second

off Time

120

180

FIGURE 32

Constant Torque Motor

EL180UHE units are equipped with a constant torque ECM motor. It has a DC motor coupled to an electronic control module both contained in the same motor housing. The mo tor is programmed to provide constant torque at each of the five selectable speeds. The motor has five speed taps. Each tap requires 24 volts to energize.

Input Voltage Requirements

The circuit is designed to be operated with AC voltage. A voltage of 12 to 33VAC is required to energize the motor. Expected current draw will be less than 20mA.

Blower Speeds

Follow the steps below to change the blower speeds.

1 - Turn off electrical power to furnace.

2 - Remove blower access panel.

3 - Disconnect existing speed tap at integrated control

speed terminal.

NOTE - Termination of any unused motor leads must be insulated.

4 - Place unused blower speed tap on integrated control

“PARK” terminal or insulate.

5 - Refer to blower speed selection chart on unit wiring dia

gram for desired heating or cooling speed. See Product Specifications manual for blower performance data.

6 - Connect selected speed tap at integrated control

speed terminal.

7 - Resecure blower access panel.

8 - Turn on electrical power to furnace.

9 - Recheck temperature rise.

Electronic Ignition

The integrated control has an added feature of an internal Watchguard control. The feature serves as an automatic re set device for integrated control lockout caused by ignition failure. This type of lockout is usually due to low gas line

pressure. After one hour of continuous thermostat demand for heat, the Watchguard will re-set and remake thermostat demand to the furnace and automatically reset the inte grated control to begin the ignition sequence.

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, a qualified techni cian should check the system as follows:

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

Filters

All EL180UHE filters are installed external to the unit. Fil ters should be inspected monthly. Clean or replace the fil ters when necessary to ensure that the furnace operates properly. Replacement filters must be rated for high veloc ity airflow. Table 1 lists recommended filter sizes.

Flue And Chimney

1 - Check flue pipe, chimney and all connections for tight

ness and to make sure there is no blockage.

2 - Check unit for proper draft.

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__________

Cleaning the Burners

NOTE - Use papers or protective covering in front of the fur nace during cleaning.

1 - Turn off both electrical and gas power supplies to fur

nace.

10%.

Page 29

2 - Label the wires from gas valve, rollout switches, prima

ry limit switch and make-up box then disconnect them.

3 - Disconnect gas supply piping. Remove the screw se

curing the burner box cover and remove cover. Re move the four screws securing the burner manifold as sembly to the vestibule panel and remove the assembly from the unit.

4 - To clean burners, run a vacuum cleaner with a soft brush

ML180UHE BURNER ASSEMBLY & REMOVAL

Rollout Switches

(-090, -110 -135 units)

attachment over the face of burners. Visually inspect in

side the burners and crossovers for any blockage

caused by foreign matter. Remove any blockage. Figure

33 shows burner detail.

5 - Reinstall burner box, manifold assembly and burner box

cover.

6 - Re-install gas supply and turn on electrical pwer to fur

nace.

Retention Rings

Rollout Switches

(-045 and -070 units)

Sensor

Ignitor

Cross Over

Manifold And Gas Valve

FIGURE 33

Repair Parts List

The following repair parts are available through independent Lennox dealers. When ordering parts, include the complete furnace model number listed on the CSA International nameplate -- Example: EL180UH045E36A-01. All service must be

performed by a licensed professional installer (or equivalent), service agency, or gas supplier.

Cabinet Parts

Upper access panel Blower panel Top cap

Control Panel Parts

Transformer Integrated control Door interlock switch Circuit breaker

Blower Parts

Blower wheel Blower housing Motor Motor mounting frame Motor power choke 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 switch (s) Secondary limit

Page 30

Start-Up & Performance Check List

Unit Model Number_______________

UNIT SET UP

(typical)

GAS SUPPLY

Natural Gas

Piping Connections Tight

Leak Tested

Serial Number___________________

Line Voltage

Gas Supply Pressure

LP/Propane Gas

SUPPLY

AIR

upflow furnace shown

Filter

RETURN

AIR

DUCT SYSTEM

AIR

SUPPLY AIR DUCT

Sealed

Insulated (if necessary)

Supply Line Pressure “ W.C.________

VENT / EXHAUST PIPE

Secure to Unit

Elbows Secured to Pipe

Roof Flashing (water tight)

Vent Pipe Supported

Page 31

Registers Open and Unobstructed

RETURN DUCT

Sealed

Filter Installed and Clean

Grilles Unobstructed

INTEGRATED CONTROL

DIP Switches Set (if applicable)

Appropriate Links in Place (if applicable)

VOLTAGE CHECK

Supply Voltage _____

Electrical Connections Tight

UNIT OPERATION

(typical)

Combustion CO

Gas Manifold Pressure

Blower Motor Amps

Thermostat

SUPPLY

AIR

upflow furnace shown

RETURN

AIR

Temperatures

Filter

Duct Static

HEATING MODE

GAS MANIFOLD PRESSURE “W.C._____

COMBUSTION SAMPLE CO

INDOOR BLOWER AMPS______

TEMPERATURE RISE

2%______

Supply Duct Temperature ________ Return Duct Temperature _ _____

Temperature Rise = ________

TOTAL EXTERNAL STATIC (dry coil)

Supply External Static _______

CO PPM_______

COOLING MODE

INDOOR BLOWER AMPS______

TEMPERATURE DROP

Return Duct Temperature _________ Supply Duct Temperature

Temperature Drop = _________

TOTAL EXTERNAL STATIC (dry coil)

Supply External Static _______

Return External Static + ______

Total External Static = _______

DRAIN LINE

Leak Free

Return External Static + ______

Total External Static = _______

THERMOSTAT

Adjusted and Programmed

Operation Explained to Owner

Contractor's: Name_________________________Telephone_____________Checklist Completed____________________

_ _______

Job Address_____-________________________________Technician's Name___________________________________

Page 32

Lennox EL180UHE User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual