Lennox A95UH2E User manual

507281-06 Page 1 of 58Issue 1724

INSTALLATION INSTRUCTIONS

A95UH2E & 95G2UHE

Warm Air Gas Furnace

Upow/Horizontal Left Air Discharge

Direct Vent & Non-Direct Vent

Save these instructions for future reference

*507281-06*

Manufactured By

Allied Air Enterprises LLC

A Lennox International, Inc. Company

215 Metropolitan Drive

West Columbia, SC 29170

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.

As with any mechanical equipment, personal injury can

result from contact with sharp sheet metal edges. Be

careful when you handle this equipment.

CAUTION

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 installer (or

equivalent), service agency or the gas supplier.

WARNING

Table of Contents

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

Parts Arrangement.......................................................3

Gas Furnace ................................................................4

Shipping and Packing List ...........................................4

Safety Information .......................................................5

General ........................................................................6

Combustion, Dilution & Ventilation Air .........................7

Installation .................................................................10

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

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

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

Condensate Piping ....................................................34

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

Electrical ....................................................................41

Unit Start-Up ..............................................................50

Other Unit Adjustments..............................................52

Blower Performance ..................................................53

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

Planned Service ........................................................57

Repair Parts List ........................................................57

507281-06Page 2 of 58 Issue 1724

1NOTE - 20 C/D (5 Ton) size units installed in upow applications

that require air volumes of 1800 cfm (850 L/s) or greater 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) air lter.

2. Single side return air with optional RAB Return Air Base

3. Bottom return air.

4. Return air from both sides.

5. Bottom and one side return air.

2 Optional External Side Return Air Filter kit is not for use with

optional Return Air Base.

* Consider sizing requirements for optional IAQ equipment before

cutting side return opening.

1−1/2

(38)

9/16

(14)

6−9/16 (167)

Left

9 (229)

Right

(584)

(19)

3/4

(19)

Bottom Return

Air Opening

GAS PIPING INLET

(Either Side)

Side Return

Air Opening

(Either Side)

Bottom Return

Air Opening

EXHAUST AIR

OUTLET

ELECTRICAL

INLET

(Either Side)

SUPPLY AIR

OPENING

WEIVEDISWEIVTNORF

TOP VIEW

9/16 (14)

3/4

27−3/4

(705)

19−7/16

(494)

23−1/2

(597)

6−1/2 (165)

(Either Side)

(838)

3−3/8

(86)

1−15/16 (49)

(356)

12−5/8 (321)

(Either Side)

OPTIONAL

SIDE RETURN

AIR FILTER KIT

(Either Side)

(406)

14−3/4

(375)

OPTIONAL

SIDE RETURN

AIR FILTER KIT

(Either Side)

5/8

(16)

3−1/4

(83)

23−3/4

(603)

(635)

1(25)

Front Panel

COMBUSTION

AIR INTAKE

2 (51)

(Either Side)

2 (51)

CONDENSATE

TRAP CONNECTION

(Either Side)

2-7/8

(73)

Model A B C D

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

045-12 17-1/2 446 16-3/8 416 16 406 7-5/8 194

070-12

090-12

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

090-16

090-20

110-16

110-20

135-20 24-1/2 622 23-3/8 594 23 584 11-1/8 283

Unit Dimensions

507281-06 Page 3 of 58Issue 1724

Figure 1.

Parts Arrangement

507281-06Page 4 of 58 Issue 1724

Gas Furnace

The A95UH2E/95G2UHE 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 A95UH2E/95G2UHE 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 taken

from outdoors and ue gases are discharged outdoors.

Non-Direct Vent installations, combustion air is taken from

indoors or a ventilated attic or crawl space and ue gases

are discharged outdoors. See Figure 2 and Figure 3 for

applications involving roof termination.

Figure 2.

Figure 3.

Shipping and Packing List

1 - Assembled Gas Furnace

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.

Please refer to specication sheets for available

accessories.

507281-06 Page 5 of 58Issue 1724

Safety Information

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 installer (or

equivalent), service agency or the gas supplier.

WARNING

As with any mechanical equipment, personal injury can

result from contact with sharp sheet metal edges. Be

careful when you handle this equipment.

CAUTION

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.

DANGER

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

Refer to unit nameplate.

A95UH2E/95G2UHE 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 American National Standards

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

In Canada, installation must conform with current National

Standard of Canada CSA-B149 Natural Gas and Propane

Installation Codes, local plumbing or waste water codes

and other applicable local codes.

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

applications, combustion and ventilation air supply must

be provided according to the current National Fuel Gas

Code or CSA-B149 standard.

Installed 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 13 and Figure 18.

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 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 units (Figure 4),

it shall be installed in parallel with, or on the upstream

side of, cooling units 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 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.

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.

507281-06Page 6 of 58 Issue 1724

Figure 4.

Heating Unit Installed Parallel to Air Handler Unit

Heating Unit Installed Upstream of Cooling Unit

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.

This furnace may be installed in alcoves, closets, attics,

basements, garages, 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 a Construction Heater

Gas furnaces manufactured on or after May 1, 2017,

are not permitted to be used in Canada for heating of

buildings or structures under construction.

WARNING

The following statement only applies to the US. Allied

Air does not recommend the use of these 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, these 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.

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

following general recommendations must be considered

when installing one of these furnaces:

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

distribution system as possible. The furnace should

also be located close to the chimney or vent termination

point.

• When the furnace is installed in an attic or other

insulated space, keep insulation away from the

furnace.

• 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.

• 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.

• Air lters must be replaced upon construction

completion.

• 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 the

instructions in the Combustion, Dilution & Ventilation

Air section 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 cleanup.

• All furnace operating conditions (including ignition,

input rate, temperature rise and venting) must be

veried according to these installation instructions.

507281-06 Page 7 of 58Issue 1724

Combustion, Dilution & Ventilation Air

If this unit 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 and ue gases are discharged outdoors.

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

WARNING

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,

appliance 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 combustion,

negative pressure (outside pressure is greater than inside

pressure) will build to the point that a down draft 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 these furnaces to ensure ef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 complete and ofcial position

of ANSI on the referenced subject, which is represented

only by the standard in its entirely.

In Canada, refer to the CSA B149 Installation codes.

Do not install the furnace in a corrosive or contaminated

atmosphere. Meet all combustion and ventilation air

requirements, as well as all local codes.

CAUTION

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 down draft.

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

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

NOTE: The Commonwealth of Massachusetts stipulates

these additional requirements:

• Gas furnaces shall be installed by a licensed plumber

or tter only.

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

• When a furnace is installed in an attic, the passageway

to and service area surrounding the equipment shall

be oored.

These units should not be installed in areas normally

subject to freezing temperatures.

CAUTION

This product contains a chemical known to the State

of California to cause cancer, birth defects, or other

reproductive harm.

WARNING

507281-06Page 8 of 58 Issue 1724

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 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

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 5.

Figure 5. Equipment in Conned Space - All Air From

Inside

Air from Outside

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” (305

mm) of the top of the enclosure and one within 12” (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 per 4,000 Btu (645 mm² per .59

kW) per hour of the total input rating of all equipment in the

enclosure (See Figure 6 and Figure 7). It is also permissible

to bring air for combustion from a ventilated attic (Figure 9)

or ventilated crawl space (Figure 10).

If this unit is being installed in an application with

combustion air coming in from a space serviced by an

exhaust fan, power exhaust fan, or other device which

may create a negative pressure in the space, take care

when sizing the inlet air opening. The inlet air opening

must be sized to accommodate the maximum volume

of exhaust air as well as the maximum volume of

combustion air required for all gas appliances serviced

by this space.

WARNING

507281-06 Page 9 of 58Issue 1724

Figure 6. Equipment in Conned Space - All Air from

Outside

(Inlet Air from Crawl Space and Outlet Air to

Ventilated Attic)

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 hour of

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

Figure 8.

Figure 7. Equipment in Conned Space - All Air from

Outside

(All Air through Ventilated Attic)

Figure 8. Equipment in Conned Space - All Air from

Outside

Figure 9. Equipment in Conned Space

(Inlet Air from Ventilated Attic and Outlet Air to

Outside)

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

of at least one square inch per 4,000 Btu (645mm2per 1.17kW) per

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

Ventilation Louvers

Inlet Air

(Minimum

12 in.(305mm) Above

attic floor)

Roof Terminated

Exhaust Pipe

Furnace

*Intake Debris

Screen

(Provided)

* See Maximum Vent Lengths table

Figure 10. Equipment in Conned Space

(Inlet Air from Ventilated Crawlspace and Outlet Air to

Outside)

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

of at least one square inch per 4,000 Btu (645mm2per 1.17kW) pe

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

Roof Terminated

Exhaust Pipe

Furnace

Ventilation

Louvers

(Crawl space)

*Intake Debris Screen Provided)

Inlet Air

(Minimum

12 in.(305mm)

Above crawl

space floor)

Coupling or

3 in. to 2 in.

Transition

(Field Provided)

* See Maximum Vent Lengths table

507281-06Page 10 of 58 Issue 1724

Installation

Setting Equipment

Do not connect the return air ducts 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.

WARNING

Upow Applications

The gas furnaces can be installed as shipped in the upow

position. Refer to Figure 13 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. Tilt the unit slightly (maximum 1/2 in.

from level) from back to front to aid in the draining of the

heat exchanger. See Figure 12.

Figure 12. Setting Equipment

Tilt the unit slightly (Max. 1/2”) from back to front to aid in the draining of the heat exchanger.

Unit must be level side-to-side in all applications.

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.

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 11. 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.

Figure 11.

Units with 1/2 HP

Blower Motor

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