Lennox G40UH-36A-045, G40UH-36A-070, G40UH-36B-090, G40UH-48B-070, G40UH-48B-090 Installation Instructions Manual

...

LEIVIVDX T

C(92006Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESEINSTRUCTIONS

FOR FUTURE REFERENCE

INSTALLATION INSTRUCTIONS

G40UH(X) Series

GAS FURNACE F]_-_ Technical

505,252M _L._L Publications

08/2006 Supersedes 505,181M Lithe U.S.A.

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

G40UH(X) Parts Arrangement .................... 3

G40UH(X) Gas Furnace .......................... 4

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

Safety Information ............................... 4

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

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

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

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

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

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

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

Electrical ....................................... 21

Unit Start-Up ................................... 25

Gas Pressure Adjustment ........................ 26

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

Other Unit Adjustments .......................... 27

Service ........................................ 28

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

Ignition Control Board Diagnostic Codes ........... 30

Troubleshooting ................................. 31

Start-Up & Performance Check List ................ 34

Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other ap- pliance.

Installation and service must be performed by a qualified installer,

service agency or the gas supplier.

08/06

IIIIIIIIIIIIIIIIIIIIIIIIIIIIHI]IIIIII

-&WARNING

WHAT TO DO IF YOU SMELL GAS:

• Do not try to light any appliance.

• Do not touch any electrical switch; do not use any phone in your building.

• Leave the building immediately.

• Immediately call your gas supplier from a neighbor's phone. Follow the gas supplier's

instructions.

• If you cannot reach your gas supplier, call

the fire department.

505,252M

Page1 IIIllllll]lllllllll]lllllllll]llllllllll

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

1.Return air from single side with transition which will accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) cleanable air filter. (Required to maintain proper air velocity.)

2. Return air from single side with optional RAB Return Air Base.

3. Return air from bottom.

4. Return air from both sides.

5.Return air from bottom and one side. Refer to Engineering Handbook for additional information.

**Flue outlet may be horizontal but furnace must be vented vertically

_Optional external side return air filter kit cannot be used

with the optional RAB Return Air Base.

',9-9/16 (14)

_OPTIONAL

EXTERNAL

SIDE RETURN

AIR FILTER KIT

(Either Side)

(1016)

3-3/4 (95)-IP 1

FLUE OUTLET

(Top)

_OPTIONAL

EXTERNAL

SIDE RETURN

AIR FILTER KIT

(Either Side)

TOP VIEW

3-1/4 (83) Right I_ 28-1/2

8-1/8 (206)Left /3-3/,L

14 (356) Right

13-1/4 (337) Left

4-7/8 (124) Right

2-1/4 (57) Left -I_

-_ (95)

-- 25 (635)

TOP VIEW

(724) "_

_,91._ 19-7/16 ._ID,,_

/ (494) 1

9/16

91-(14)

14-3/4

3/4 (19) -I_

G40UH-24A-045, G40UH-24A-070, 368 13-3/8 340 13 114

G40UH-36A-045, G40UH-36A-070

G40UH-36B-090, G40UH-48B-070, 446 16-3/8 416 16 152

G40UH-48B-090 G40UH-36B-110,

G40UH-48C-110, 533 19-7/8 454 19-1/2 197 G40UH-48C-135,

G40UH-60C-110 G40UH-60D-135 622 23-3/8 546 23 241

G40UH-60D-155

,q_-i C m

*Bottom Return

Air Opening

FRONT VIEW

Model No.

_1__1- 3/4 (19)

A B C

in.

14-1/2

17-1/2

24-1/2

(375)

(406)

5/8(16)

23-1/2 y

4-1/4

(108)

mm in. mm in. mm

Page 2

(597)

*Bottom Return

Air Opening

SIDE VIEW

mm in

330 4-1/2

406 6

495 7-3/4

584 9-1/2

FlueBoxGasket /

Deflector

G40UH-48C-135,

G40UH-60C-110, &

G40UH-60D-155

Units Only

Gasket

Flue Transition

Flame Sensor _ I

Flame Rollout Switches* i

Flame Rollout Bracket

Gas Valve

Heat Excha _._...

Flue Collector Box

Combustion Air

Orifice

Combustion Air

Pressure Switch

Inducer

Limit Shield

Primary Limit

NOx Insert

(NO x Units Only'

Gas Orifices

Igniter Bracket Igniter

Burner Bottom Shield

Control Transformer

"135 and 155 kBtuh units only --

Flame rollout switches are located

on the left and one on the right) of the burner box.

on brackets on the inner sides (one J "_

Integrated Ignition

Control Board

"4_

Secondary Limit

Blower Assembly

_ Capacitor

Door Interlock Switch

FIGURE 1

Page 3

TheG40UH(X)gasfurnaceisshippedreadyforinstalla- tionin theupfiowandhorizontalposition(leftor right)

fueledbynaturalgas.Aconversionkit(orderedseparate- ly)isrequiredforuseinpropane/LPgasapplications.The

furnaceisshippedwiththebottompanelinplace.Thebot- tompanelmustberemovediftheunitistobeinstalledina

horizontalapplication.Thepanelmayalsoberemovedin upfiowapplications.

Package 1 of 1 contains

1 - Assembled G40UH(X) unit 1 - Bag assembly containing the following:

2 - Screws 3 -Wire nuts

1 - Snap bushing 1 - Snap plug

1 - Wire tie 1 -Vent warning label

1 -Owner's manual and warranty card

The following items may also be ordered separately:

1- Thermostat 1 - Hanging bracket (for horizontal installations)

1 - Propane/LP changeover kit

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

.WARNING

&,CAUTION

G40UH(X) units are CSA International certified to ANSI Z21.47 and CSA 2.3 standards.

In the USA, installation of gas furnaces must conform with lo- cal 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

In Canada, installation must conform with current CSA B149 Natural Gas and Propane Installation Codes, local

plumbing or waste water codes and other applicable local codes.

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

or CSA B149 standards. Vent installations must be consistent with the venting

tables (in this instruction) and applicable provisions of local building codes. This furnace is CSA Intemational certified for installation

clearances to combustible material as listed on the unit nameplate and in the tables in figures 6 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.

For installation in a residential garage, the furnace must

be installed so that the burner(s) and the ignition source are located no less than 18 inches (457 mm) above the

floor. The furnace must be located or protected to avoid physical damage by vehicles. When a furnace is installed

in a public garage, hangar, or other building that has a haz- ardous atmosphere, the furnace must be installed accord-

ing to recommended good practice requirements and cur- rent National Fuel Gas Code or CSA B149 standards.

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

exchanger failure.

This G40UH(X) furnace must be installed so that its electri- cal components are protected from water.

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. With a parallel flow arrangement, a damper (or other means

to control the flow of air) must adequately prevent chilled air from entering the furnace. If the damper is manually oper-

ated, it must be equipped to prevent operation of either the heating or the cooling unit, unless it is in the full HEAT or COOL setting.

When installed, this furnace must be electrically grounded according to local codes. In addition, in the United States, installation must conform with the current National Electric

Code, ANSI/NFPA No. 70. The National Electric Code (ANSI/NFPA No. 70) is available from the following ad-

dress:

National Fire Protection Association

1 Battery March Park

Quincy, MA 02269

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

and/or local codes.

Page 4

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.

NOTE - G4OUH(X) series units should not be installed as a unit heater.

• Gas furnaces shall be installed by a licensedplumb-

er or gas fitter only.

• The gas cock must be "T handle" type.

• When a furnace is installed in an attic, the passage-

way to and service area surrounding the equipment

shall be floored.

The G40UH(X) furnace may be installed in alcoves, clos- ets, attics, basements, garages, and utility rooms in the up-

flow or horizontal position.

This furnace design has not been CSA International certi-

fied for installation in mobile homes, recreational vehicles,

or outdoors. Lennox does not recommend the use d G40UH(X) 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.

G40UH(X) units may be used for heating of buildings or structures under construction, if the following conditions

are met:

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

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

allowed.

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

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

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

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

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

• One hundred percent (100%) outdoor air must be pro- vided for combustion air requirements during construc- tion. Temporary ducting may supply outdoor air to the furnace. Do not connect duct directly to the furnace. Size the temporary duct following these instructions in section for Combustion, Dilution and Ventilation Air in a confined space with air from outside.

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

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

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

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 G40UH(X) 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.

• 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.

,,WARNING

In the past, there was no problem inbringing 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

Page 5

(outsidepressureisgreaterthaninsidepressure)willbuild tothepointthatadowndraftcanoccurinthefurnacevent pipeorchimney.Asaresult,combustiongasesentertheliv- ingspacecreatingapotentiallydangeroussituation.

Intheabsenceoflocalcodesconcerningairforcombus- tionandventilation,usetheguidelinesandproceduresin thissectiontoinstallG40UH(X)furnacestoensureefficient andsafeoperation.Youmustconsidercombustionair

needsandrequirementsforexhaustventsandgaspiping. Aportionofthisinformationhasbeenreprintedwithper-

missionfromtheNationalFuelGasCode(ANSI-Z223.1). Thisreprintedmaterialisnotthecompleteandofficialposi- tionoftheANSIonthereferencedsubject,whichisrepre- sentedonlybythestandardinitsentirety.

InCanada,refertotheCSAB149installationcodes.

,&CAUTION

&CAUTION

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 m3) per 1,000 Btu (.29 kW) per hour of the com- bined input rating of all appliances installed in that space. This space also includes adjacent rooms which are not separated by a door. Though an area may appear to be un- confined, it might be necessary to bring in outdoor air for combustion if the structure does not provide enough air by

infiltration. If the furnace is located in a building of tight construction with weather stripping and caulking around

the windows and doors, follow the procedures in the air from outside section.

Confined Space A confined space is an area with a volume less than 50 cu-

bic feet (1.42 m3) per 1,000 Btu (.29 kW) per hour of the combined input rating of all appliances installed in that space. This definition includes furnace closets or small equipment rooms.

When the furnace is installed so that supply ducts carry air circulated by the furnace to areas outside the space con- taining the furnace, the return air must be handled by ducts which are sealed to the furnace casing and which terminate outside the space containing the furnace. This is especially important when the furnace is mounted on a platform in a confined space such as a closet or small equipment room.

Even a small leak around the base of the unit at the platform or at the return air duct connection can cause a potentially negative pressure condition. Air for combustion and dan- gerous ventilation can be brought into the confined space either from inside the building or from outside.

Page 6

EQUIPMENT IN CONFINED

CHIMNEY

VENT

FURNACE 1_

I I I I I II I I I I I I II I I I I I

SPACE ALL AIR FROM INSIDE

HEATER

OPENINGS

(To Adjacent

WiTER/

Room)

I I I I

NOTE-Each opening shall have a free area of at least one square

inch (645 mm'_? per 1,000 Btu (. 29 kW) per hour of the total input rat- ing of all equipment in the enclosure, but not less than !00 square inches (64516 mm2).

FIGURE 2

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 mm2) 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 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 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 mm2) per 4,000 Btu (1.17 kW) per hour d 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 1square inch (645 mm 2) 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. Ifthe design and free area d 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.

EQUIPMENT IN CONFINED SPACE

ALL AIR FROM OUTSIDE

CHIMNEY OR

GAS VENT

VENTILATION LOUVERS

(Each end of attic)

I ...... I

FURNACE AIR WATER

VENTILATION INLET

LOUVERS AIR

(For unheated crawl ._

NOTE-The inlet and outlet air openings shall each have a free area of at least one square inch (645 mm2)

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

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

OUTLET

HEATER

FIGURE 3

Page 7

CHIMNEY

OR GAS

EQUIPMENT IN CONFINED SPACE

ALL AIR FROM OUTSIDE

(All Air Through Ventilated Attic)

VENTILATION LOUVERS

(Each end of attic)

The G40UH(X) gas furnace can be installed as shipped in either the upflow position or the horizontal position, with right-hand or left-hand air discharge,

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.

FURNACE

NO TE- The inlet and outlet air openings shall each have a free area of at least one square inch (645 mm 2)per 4,000

Btu (1.17 kW) per hour of the total input rating of all equip- ment in the enclosure.

INLET AIR

(Ends 12 in.

above bottom)

HEATER

FIGURE 4

A _ EQUIPMENT IN TT'_. //_ CONFINED SPACE

I I "_"/ _ ALLAIRFROM

NOTE - 1/3 hp blower motors are equipped with four flex- ible mounting legs, and 1/2 hp blower motors are equipped

with three flexible legs and one rigid leg. The rigid leg is equipped with a shipping bolt and a flat white plastic wash- er (rather than the rubber mounting grommet used with a flexible mounting leg). The bolt and washer must be re- moved before the furnace is placed into operation. Af- ter the bolt and washer have been removed, the rigid leg

will not touch the blower housing.

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 6,

Upflow Application Installation Clearances

Top

Left Side

Right Side

,,,,i

NOTE - Each air duct opening shall have a free area of at least o 2

ne 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 communicate directly with the outdoors, each open- ing shall have a free area of at least one square inch (645 mm2)

per4,000 Btu (1.17 kW) per hour of the total input rating of all

other equipment in the enclosure.

, l

FIGURE 5

AWARNING

Page 8

Bottom

Type of Vent

Connector

Top

*Front

Back

Sides

Vent Floor

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

SFor installations on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring. l-Left side requires 3 inches ifa single wall vent is used on 14-1/2 inch cabinets, or 2 inches if a single wall vent is used on 17-1/2

inch cabinets.

TypeC

1in, (25 ram)

3 in, (76 ram)

6 in. (152 ram)

Type B1

1 in, (25 ram)

3 in, (76 ram)

0 0

1 in, (25 ram)

0J;

FIGURE 6

Return Air -- Upflow Applications

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.

NOTE - When air volumes over 1800 cfm (850 L/s) are required with 60C or 60D models in an upflow applica- tion, the following return air options are available:

1 - Return air from single side with transition which will

accommodate 20 x 25 x 1 in. (508 x 635 x 25 mm) clean- able air filter. (Required to maintain proper air velocity.)

See figure 7.

2 - Return air from single side with optional RAB Return

Air Base. See figure 8.

3 - Return air from bottom.

4 - Return air from both sides.

5 - Return air from bottom and one side.

Refer to Engineering Handbook for additional information.

Side Return Air

(with transition and filter)

20" X 25" X 1"

(508mm X635mm X 25mm)

Cleanable Filter

Return Air

Plenum

Transition

FIGURE 7

Optional Return Air Base

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

AIR FLOW

17-1/2 (446) RAB-B (98M60)

21 (533) RAB-C (98M58)

24-1/2 (622) RAB-D (98M59)

7-1/4 (184)

OPTIONAL RAB

RETURN AIR BASE

7/8

(22)

(102)1"9_-

123(584) fL_-

Overall 1 MinimuV_

(Maximum) 11 (279)

1 Unit side return airOpening 11_5.6) j_ __

5-5/8

(143)

....................._ 23 (584)........................................................................_!

_1-- 27-5/8 (702)

SIDE VIEW

2 Maximurr

1 22-7-16

(570)

Overall

Maximum)

_-- 3/4

FRONT VIEW

NOTE- Optional Side Return Air Filter Kits are not for use with RAB Return Air Base. 1 Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.

Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in.

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

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

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

(19)

FIGURE 8

Page 9

Removingthe 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 9.

Removing the Bottom Panel

Leveling Bolt Installation

3/8

(1o)_r

Furnace Front _ [

3/8 1-3/4

Inches (mm)

(44)

Screw

Bottom Cap

Bottom

FIGURE 9

Leveling an Upflow Unit

When the side return air inlets are used in an upfiow ap- plication, it may be necessary to install leveling bolts on the bottom of the furnace. Use field-supplied corrosion-resist- ant 5/16 inch machine bolts (4) and nuts (8), See figure 10,

NOTE - The maximum length of the bolt is 1-1/2 inches,

1 - Lie the furnace on its back and drill a 5/16 inch diame-

ter hole in each corner of the furnace's bottom. See fig- ure 10 for the correct location of the holes, Drill through

the bottom panel and the bottom flange of the cabinet.

2 - Install one bolt and two nuts into each hole. Screw the

first nut onto a bolt and then insert the bolt into a hole. A flat washer may be added between the nut and the bot-

tom of the unit.

3 - Screw another nut onto the bolt on the inside of the fur-

nace base. A flat washer may be added between the nut and the bottom of the unit.

4 - Adjust the outside nut to the appropriate height and

tighten the inside nut to secure the arrangement,

NOTE - The unit may be tilted back-to-front a maximum of

1", This will ensure proper draining of the heat exchanger,

1-3/4

(44)

Furnace

Bottom

Leveling Bolts

3/8

(1o)

I-3/4 (44)

FIGURE 10

Horizontal Applications

The G40UH(X) furnace can be installed in horizontal ap- plications,

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,

Horizontal Application

Installation Clearances

Top

Left End

Bottom

Vent Connector

Type Type C Type B1

Top 0 0

*Front 3 in. (76 ram) 3 in. (76 ram)

Back 0 0

Ends 2 in. (51 ram) 2 in. (51 ram) Vent 6 in. (152 ram) 1 in. (25 ram)

Floor 05 05

*Front clearance in alcove installation must be 24 in. (610 ram). Maintain a minimum of 24 in. (610 ram) for front service access. :_For installations on a combustible floor, do not install the furnace directly on carpeting, tile or other combustible materials other than wood flooring.

FIGURE 11

Leveling Bolts

3/8

(10)

1-3/4

(44)

Right End

Page 10

Thisfurnacemaybeinstalledineitheranatticoracrawl- space,Eithersuspendthefurnacefromroofraftersor

floorjoists,asshowninfigure12,orinstallthefurnaceon

aplatform,asshowninfigure13.Theunitmustbesup- portedatbothendsandbeneaththeblowerdecktopre- ventsagging,

NOTE -In horizontal applications, the unit must be lev- el side to side. The unit may be tilted back to front a maxi-

mum of 1". This will ensure proper draining of the heat ex- changer.

Typical Horizontal Application

Unit Suspended in Attic or Crawlspace

Leave sufficient clearance between rod and unit to remove access panel.

///

Horizontal Application

Unit Installed on Platform

NOTE - Line contact is permis-

sible. See the unit nameplate for

clearances.

GAS

ENTRY

WORKING

PLATFORM

FIGURE 13

__VENT

PIPE

1/4 in. ROD

ANGLE

IRON

U-CHANNELS

FIGURE 12

NOTE - Heavy gauge perforated sheet metal straps (plumbers' straps) may be used to suspend the unit from

roof rafters or ceiling joists. When straps are used to sus-

pend the unit in this way, support must be provided for both

the ends and the middle of the furnace to prevent sagging.

The straps must not interfere with the plenum or exhaust

piping installation. Securing screws should be 1/2 inch

from the top edge and 1-1/2 inch from the side edge in all cases. 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 can 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 9,

&WARNING

a,WARNING

Page 11

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