Lennox G50UH-24A-070, G50UH-48C-135, G50UH-24A-045, G50UH-60C-110, G50UH-60D-155 User Manual

...

INSTALLATION

,1_2006 Lennox industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE

INSTRUCTIONS

G50UH(X) Series

GAS FURNACE

505,254M _ Technical 8/2006 .L_._LPublications Supersedes 504,957M

Lithe U.S.A.

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

G50UH(X) Parts Arrangement .................... 3

G50UH(X) Gas Furnace .......................... 4

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

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

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

Combustion, Dilution & Ventilation Air .............. 6

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 ................ 35

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

IIIHIININIIIIIIIIIIIIIIIIIIIIIIIIIIII

&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.

505,254M

Page1

IIIHIIIIIIIIIIIIIIIIIIINIIIIIIIIIIIIIIIIIIIIIII

1NOTE - 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) air filter. Required to

maintain proper air velocity across the filter.

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. See Blower Performance Tables for additional information.

2Flue outlet may be horizontal but furnace must be vented vertically 3Optional External Side Return Air Filter Kit is not for use

with the optional RAB Return Air Base.

,_ A -_

B _ 4-9/16 (14)

I I

/" ........... h r ........... h ::::::::h f ..............

3OPTIONAL

EXTERNAL

SIDE RETURN

AIR FILTER KIT

__ (Either Side)

__ 40

.... (1016)

3-3/4 (95)-I_ 1

FLUE OUTLET

(Top)

1OPTIONAL

EXTERNAL

SIDE RETURN

AIR FILTER KIT

(Either Side)

3-1/4 (83) Right

8-1/8 (206) Left

13-1/4 (337) Left

4-7/8 (124) Right

2-1/4 (57) Left -I_

23-3/4 (603)

I_1 25 (635) =

TOP VIEW

28-1/2

(724)

r--

ELECTRICAL INLET

o GAS PIPING INLET

ELECTRICAL INLET

OW (Either Side)

SUPPLY AIR

OPENING

9/16

iE OUTLET

(Either Side)

,, i

AiR FLOW

5/8 (16)

1Bottom Return

Air Opening

FRONT VIEW

Model No.

G50UH-24A-045, G50UH-24A-070, 14-1/2 368 13-3/8 340 13 330 4-1/2 114 G50UH-36A-070

G50UH-36B-090, 17-1/2 446 16-3/8 416 16 406 6 152 G50UH-48B-090

G50UH-36C-110, G50UH-48C-110, 21 533 19-7/8 504 19-1/2 495 7-3/4 197

G50UH-48C-135, G50UH-60C-110

G50UH-60D-135, 24-1/2 622 23-3/8 546 23 584 9-1/2 241 G50UH-60D-155

A B C D

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

[102 (584)

4 23

1OPTIONAL

RETURN CUTOUT (3_6)

L (Either Side)

4-1/4 (108)

1Bottom Return

Air Opening

SIDE VIEW

1-15/16 (49)

23-1/2 v

(597)

Page 2

Gasket

FlueTransition

Flame Sensor _

Flame Rollout Switches*

FlueBoxGasket

Combustion Air

Orifice

Combustion Air

Pressure Switch

Air Inducer

Limit Shield

AirDeflector

G50UH-48C-135,

G50UH-60C-110&

G50UH-60D-155

UnitsOnly

HeatExchanger

FlueCollectorBox

Flame Rollout Bracket

Gas Valve

Gas Orifices

Ignitor Bracket Ig'_itor

Burner Bottom Shield

Control Transformer

SureLight ¢ Control Board _'_ " Capacitor

"135 and 155 kBtuhunits only -- Flame rolloutswitches are located

on brackets onthe innersides (one _ Door Interlock Switch on the left and one on the right) of the burner box.

Primary Limit

NOx Insert

(NOx Units Only)

_ _'_ X Blower Assembly

Secondary Limit

FIGURE 1

Page 3

TheG50UH(X)gasfurnaceisshippedreadyforinstalla- tionintheupfioworhorizontalposition(leftorright).The furnaceisshippedwiththebottompanelinplace.Thebot- tompanelmustberemovediftheunitistobeinstalledina

horizontalapplication.Thepanelmayalsoberemovedin upfiowapplications.

Package 1 of 1 contains

1 - Assembled G50UH(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 be ordered separately:

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

1 - Propane/LP changeover kit 1 - High altitude kit 1 - Return air base 1 - Side filter kit

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

A,WARNING

A,CAUTION

G50UH(X) units are CSA International certified to ANSI Z21.47 and CSA 2.3 standard.

In the USA, installation of gas furnaces must conform with local building codes. In the absence of local codes, units must be installed according to the current National Fuel Gas Code (ANSI-Z223.1/NFPA 54). The National Fuel Gas Code is available from the following address:

American National Standards Institute, Inc.

11 West 42nd Street

New York, NY 10036

In Canada, installation must conform with current National Standard of Canada CSA B149 Natural Gas and Propane

Installation Codes," local plumbing or waste water codes and other applicable local codes.

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 shaft 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.

This G50UH(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. Ifthe damper is manu- ally operated, it must be equipped to prevent operation of either the heating or the cooling unit, unless it is in the full

HEAT or COOL setting.

Page 4

Wheninstalled,thisfurnacemustbeelectricallygrounded accordingtolocalcodes.Inaddition,intheUnitedStates,

installationmustconformwiththecurrentNationalElec- tricCode,ANSI/NFPANo.70.TheNationalElectricCode

(ANSI/NFPANo.70)isavailablefromthefollowingad- dress:

NationalFireProtectionAssociation

1BatteryMarchPark

Quincy,MA02269 InCanada,allelectricalwiringandgroundingfortheunit mustbeinstalledaccordingtothecurrentregulationsofthe

CanadianElectricalCodePartI (CSAStandardC22.1) and/orlocalcodes.

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 anight setback thermostat is used. Return air tem-

perature must not exceed 85°F (29 °C) dry bulb.

The G50UH(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 of G50UH units as a

construction heater during any phase of construction. Very low return air temperatures, harmful vapors and operation of the unit with clogged or misplaced filters will damage the

unit. G50UH units may be used for heating of buildings or struc-

tures 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:

• Gas furnaces shall be installed by a ticensedptumb- 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.

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 G50UH(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

Page 5

Inthepast,therewasnoprobleminbringinginsufficientout- doorairforcombustion.Infiltrationprovidedalltheairthat

wasneeded.Intoday'shomes,tightconstructionpractices makeitnecessarytobringinairfromoutsideforcombus-

tion.Takeintoaccountthatexhaustfans,appliancevents, chimneys,andfireplacesforceadditionalairthatcouldbe

usedforcombustionoutofthehouse.Unlessoutsideairis broughtintothehouseforcombustion,negativepressure

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

Intheabsenceoflocalcodesconcerningairforcombus- tionandventilation,usetheguidelinesandproceduresin thissectiontoinstallG50UH(X)furnacestoensureefficient andsafeoperation.Youmustconsidercombustionair needsandrequirementsforexhaustventsandgaspiping. Aportionofthisinformationhasbeenreprintedwithper- missionfromtheNationalFuelGasCode(ANSI-Z223.1). Thisreprintedmaterialisnotthecompleteandofficialposi- tionoftheANSIonthereferencedsubject,whichisrepre- sentedonlybythestandardinitsentirety.

InCanada,refertothestandardCSAB149installation codes.

ACAUTION

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 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 asmall 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,

Page 6

EQUIPMENT IN CONFINED

CHIMNEY

VENT

FURNACE 1_

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 2) per 1,000 Btu (.29 kW) per hour of the total input rat- ing of all equipment in the enclosure, but not less than 100 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 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 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 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 befixed in the

open position or interlocked with the equipment so that they are opened automatically during equipment operation.

CHIMNEY OR

GAS VENT

VENTILATION LOUVERS

(Each end of attic)

I ...... I

FURNACE AIR WATER

VENTILATION INLET

LOUVERS AIR

(For unheated crawl !

NO TE- 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.

OUTLET

EQUIPMENT IN CONFINED SPACE

ALL AIR FROM OUTSIDE

(Inlet Air from Crawlspace and Outlet Air

to Ventilated Attic)

HEATER

FIGURE 3

Page 7

CHIMNEY

OR GAS

VENT_

EQUIPMENT IN CONFINED SPACE

ALL AIR FROM OUTSIDE

(All Air Through Ventilated Attic)

VENTILATION LOUVERS

(Each end of attic)

The G50UH(X) gas furnace can be installed as shipped in either the upfiow 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'_. JJ_ CONFINED SPACE

I I "_'Y _ ALLAIRFROM

OUTLET AIR

I 1

FURNACE

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

I1"- ,,

I ii I I I I I I I I I I I

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

o 2

ne square inch (645 mm J 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.

FIGURE 5

-&WARNING

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 installation 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 25x 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

(10)_r

Furnace Front _'1 [

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 upflow 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 - Themaximum 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 fiat 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,

1-3/4

(44)

Furnace

Bottom

Leveling Bolt

Locati_

3/8

(10)

I-3/4 (44)

Leveling Bolt

Locations

3/8

(10)

1-3/4

(44)

FIGURE 10

Horizontal Applications

The G50UH(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

Top

*Front

Back Ends

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. _:For installations on a combustible floor, do not install the furnace

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

Type C

3 in. (76 ram)

2 in. (51 ram)

6 in. (152 ram)

o:_

Right End

Type B1

3 in. (76 ram)

2 in. (51 ram)

1 in. (25 ram)

o:_

FIGURE 11

Page 10

Thisfurnacemaybeinstalledineitheranatticoracrawl- space.Eithersuspendthefurnacefromroofraftersor

floorjoists,asshowninfigure12,orinstallthefurnaceon

aplatform,asshowninfigure13.Theunitmustbesup- portedatbothendsandbeneaththeblowerdecktopre- ventsagging.

Typical Horizontal Application

Unit Suspended in Attic or Crawlspace

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

1/4 i

ANGLE

IRON

U-CHANNELS

Horizontal Application

Unit Installed on Platform

NOTE - Line contact is permis-

sible. See the unit nameplate for

clearances.

GAS

ENTRY

WORKING

PLATFORM

FIGURE 13

-&WARNING

__VENT

PIPE

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 providedfor both

the ends and the middle ofthe furnace to prevent sagging.

The straps must not interfere with the plenum or exhaust

piping instaflation. Securing screws should be 1/2 inch

from the top edge and 1-1/2 inch from the side edge in aft 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

Page 11

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