Lennox G50UH(X) SERIES Guide

05/00

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504,121M

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G50UH(X)

SERIES

Litho U.S.A.

504,121M

5/2000

WHAT TO DO IF YOU SMELL GAS:

Iftheinformationinthismanualisnotfollowed

exactly, a fire or explosion may result causing

property damage, personal injury or loss of

life.

WARNING

Do not try to light any appliance.

Do not touch any electrical switch; do not use any

phone in your building.

Immediatelycallyourgassupplierfromaneighbor’s

phone. Follow the gas supplier’s instructions.

Ifyou cannotreachyourgassupplier,callthefire de-

partment.

Extinguish any open flames.

GAS FURNACE

Do not store or use gasoline or other flam-

mable vapors and liquids in the vicinity of

this or any other appliance.

Installation and service must be performed by

a qualified installer, service agency or the gas

supplier.

2000 Lennox Industries Inc.

Dallas, Texas, USA

Page 2

G50UH(X) Parts Identification

DURALOKTM HEAT

EXCHANGER

ASSEMBLY

UPPER ACCESS

PANEL

BURNERS

BLOWER

MOTOR

GAS

MANIFOLD

CABINET

CONTROL BOX

GAS

VALVE

COMBUSTION AIR

PROVING

(PRESSURE) SWITCH

COMBUSTION AIR

INDUCER

BLOWER ACCESS

PANEL

FLUE

COLLAR

TOP CAP

SURELIGHT

CONTROL BOARD

NAMEPLATE

FIGURE 1

WARNING

Product contains fiberglass wool.

Disturbing the insulation in this product during

installation, maintenance, or repair will expose you

to fiberglass wool. Breathing this may cause lung

cancer.(Fiberglasswool is knowntotheStateofCal-

ifornia to cause cancer.)

Fiberglass wool may also cause respiratory, skin,

and eye irritation.

To reduce exposure to this substance or for further

information, consult material safety data sheets

availablefromaddressshownbelow,orcontactyour

supervisor.

Lennox Industries Inc.

P.O. Box 799900

Dallas, TX 75379-9900

NOTE - This manual must be left with the equipment

user.

WARNING

Do not set thermostat below 60°F (16°C) in heating

mode. Setting thermostat below 60°F (16°C) reduces

the number of heating cycles. Damage to the unit

may occur that is not covered by the warranty.

WARNING

Ifoverheatingoccursorifgassupplyfailstoshutoff,

shutoffthemanualgasvalvetothe appliancebefore

shutting off electrical supply.

CAUTION

Before attempting to perform any service or mainte-

nance, turn the electrical power to unit OFF at the

disconnect switch.

Page 3

WARNING

Do not use this furnace if any part has been under

water. Immediatelycallaqualifiedservicetechnician

to inspect the furnace and to replace any part of the

control system and any gas control which has been

under water.

IMPORTANT

Any additions, changes, or conversions required in

order for the appliance to satisfactorily meet the ap-

plication needs must be made by a Lennox service

technician using factory specified and approved

parts.

WARNING

Improperinstallation,adjustment,alteration,service

ormaintenancecancausepropertydamage,person-

al injury or loss of life. Installation and service must

be performed by a qualified installer, service agency

or the gas supplier.

Important Directions

1 - Keep the furnace area clear and free of combustible

material, gasoline, and other flammable vapors and

liquids.Ifitisinstalledinaninsulatedarea,thefurnace

mustbekeptfreeofinsulatingmaterial.Insulatingma-

terial may be combustible.

2- DO NOT obstruct air flow to unit. Unit must receive an

unobstructed flow of combustion and ventilating air.

3- DO NOT store chlorine or fluorine products near unit

or introduce these products into the combustion air.

These products can cause furnace corrosion.

4- DONOTdrawreturnairfromaroomwherethisfur-

nace, or any other gas appliance (ie., a water heat-

er),isinstalled.Whenreturnairisdrawnfromaroom,

anegativepressureiscreatedintheroom.If agasap-

pliance is operating in a room with negative pressure,

the flue products can be pulled back down the vent

pipe and into the room. This reverse flow of the flue

gas may result in incomplete combustion and the

formation of carbon monoxide gas. This toxic gas

might then be distributed throughout the house by the

furnace duct system.

WARNING

The blower door must be securely in place when the

blower and burners are operating. Gas fumes,which

could contain carbon monoxide, can be drawn into

the living space resulting inpersonalinjury or death.

Your furnace is a gas appliance. It is critical that the gas

supplied to the unit be completely burned to avoid the pro-

duction of carbon monoxide gas. Complete combustion of

the gas requires, but is not limited to, correct gas pressure

and gas flow rate, adequate combustion air and proper

venting.

WARNING

Carbon monoxide gas is invisible, odorless, and

toxic.

Exposure to carbon monoxide gas can cause personal inju-

ry and even death to all occupants, including pets. Any item

that is powered by, or gives off heat from, a combustion pro-

cess (including lawn mowers, automobiles, and fireplaces)

hasthepotentialtoproducecarbonmonoxidegas.Because

ofthis,Lennoxrecommendstheuseofa carbonmonox-

ide detector in your home, even if you do not own gas

appliances. Reliable detectors are available at reasonable

retail prices. Contact your Lennox dealer for more details

about this investment in your safety.

Yourfurnaceis designedtomeetstandards setbynation-

al agencies. It should operate safely when properly

installed and maintained. However, the unit’s perfor-

mance can be greatly impacted by the individual installa-

tion and the operating environment. It is your responsibil-

ity to ensure that this appliance is maintained. Proper

maintenanceis criticalforyoursafety andthesatisfactory

operationoftheproduct.Lennoxstronglyrecommends

annualinspectionandmaintenanceofthisappliance.

Contact your Lennox dealer for an inspection by a quali-

fied service technician.

Lighting Information & Operation

WARNING

If you do not follow these instructions exactly, a fire

or explosion may result causing property damage,

personal injury or death.

BEFORE LIGHTING smell all around the appliance area

forgas.Besuretosmellnexttothefloorbecausesomegas

is heavier than air and will settle on the floor.

Page 4

The gas valve on the G50UH(X) is equipped with either a

gas control knob or lever. Use only your hand to turn the

gas control knob or push the gas lever. Never use tools. If

theknoborleverwillnotmovebyhand,donottrytorepair

it. Call a qualified service technician. Force or attempted

repair may result in a fire or explosion.

Placing the G50UH(X) furnace into operation:

G50UH(X) units are equipped with a SureLight

ignition

system. Do not attempt to manually light burners on these

furnaces. Eachtimethethermostatcallsfor heat, the burn-

ers will automatically light. The ignitor does not get hot

when there is no call for heat on units with the SureLight

ignition system.

Operating the Gas Valve (Figures 3, 4and 5)

1- STOP! Read the safety information atthe beginning of

this section.

2 - Set the thermostat to the lowest setting. See figure 2.

3 - Turn off all electrical power to the unit.

THERMOSTATS

FIGURE 2

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.

White Rodgers 36E/36F Gas Valve -

Switch gas

valvelevertoOFF.Seefigure3fortheWhiteRodg-

ers 36E valve and figure 4 for the White Rodgers

36F valve.

Honeywell VR8205 Gas Valve -

Turn knob on gas

valveclockwise toOFF.Donotforce.Seefigure

7 - Wait fiveminutestoclearoutanygas.Ifyou thensmell

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.

WhiteRodgers 36E/36FGasValve-

Switchgasvalvele-

ver to ON. See figure 3 for the White Rodgers 36E

valveandfigure4fortheWhiteRodgers36Fvalve.

Honeywell VR8205 Gas Valve -

Turn knob on gas valve

counterclockwise to ON. Do not force.

White Rodgers 36E Series Gas Valve

GAS VALVE SHOWN IN OFF POSITION

MANIFOLD

PRESSURE

ADJUSTMENT

SCREW

MANIFOLD

PRESSURE

OUTLET

FIGURE 3

White Rodgers 36F Series Gas Valve

GAS VALVE SHOWN IN OFF POSITION

MANIFOLD

PRESSURE

ADJUSTMENT

SCREW

MANIFOLD

PRESSURE

OUTLET

FIGURE 4

OFF

Honeywell VR8205 Series Gas Valve

GAS VALVE SHOWN IN OFF POSITION

MANIFOLD

PRESSURE

ADJUSTMENT

SCREW

MANIFOLD

PRESSURE

OUTLET

FIGURE 5

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

“TurningOffGastotheUnit”andcallyourservicetech-

nician or gas supplier.

Turning Off Gas to the Unit

1 - Set the thermostat to the lowest setting.

2 - Turnoff all electrical powerto theunit if service is to be

performed.

3 - Remove the upper access panel.

Page 5

White Rodgers 36E/36F Gas Valve -

Switch gas

valve lever to OFF.

Honeywell VR8205 Gas Valve -

Turn knob on gas

valve clockwise to OFF.Donotforce.

5 - Replace the upper access panel.

Filters

This unit is not equipped with a filter or rack. A field-pro-

vided, high-velocity filter is required to ensure proper unit

operation.

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

Seasonal Inspections

A qualified service technician should inspect the complete

system each season (heating and cooling). The following

maintenance procedures should only be conducted by a

qualified service technician. Do not attempt to service

the unit in any way.

Venting System

WARNING

Asphyxiation Hazard

The exhaust vent for this furnace must be securely

connected to the furnace flue collar at all times.

For your safety and to fulfill the terms of the limited

warranty,aqualifiedservicetechnicianmustannual-

ly inspect this furnace and its vent system.

Annually (before heating season) inspect furnace venting

system, vent cap, heat exchanger and burners for corro-

sion, deterioration, or deposits of debris. Remove any ob-

structions.

Inspect thefurnace venting system to make sure it is in

place, physically sound and without holes, corrosion, or

blockage. The vent connector must be correctly posi-

tioned and sloped upward. The vent connector must be

physically sound, without holes or excessive corrosion.

Inspect the furnace return air duct connection. The duct

mustbesealedtothefurnaceanditmustterminateoutside

the space containing the furnace.

Inspect the physical support of the furnace to guarantee

that it is sound. The support must not sag and must not

have cracks or gapsaround thebase ofthefurnace. There

must be a seal between the furnace base and the support.

During a seasonal check, the service technician will in-

spect the indoor blower and the burner flames along with

the venting system.

Blower

Check blower wheel for any debris and clean it, if neces-

sary.Theblowermotorispre-lubricatedforextendedbear-

ing life. No further lubrication is needed.

Burner Flame

CAUTION

To ensure proper operation, a qualified technician

should annually check the burner flame.

Service Reminder

Callyour Lennoxservice technicianif the unitwillnotoper-

ate. Before calling, always check the following to be sure

service is required.

1 - Check that electrical disconnect switches are ON.

2 - Check room thermostat for proper setting.

3 - Replace any blown fuses or reset circuit breakers.

4 - Gas valve should be ON.

5 - Air filter should not be plugged, which wil limit air flow.

6 - Is gas turned on at meter?

7 - Is manual main shut-off valve open?

Record the modelandserialnumber ofthefurnace.These

numbers areon the unitnameplate, whichis located below

the burners.

Serial Number ________________________________

Model Number ________________________________

Safety Precautions

If you discover any of the following, shut down your

unitandcontactaLennoxdealerforan inspectionbya

qualified technician.

If you repeatedly hear any new or unfamiliar sounds

whileyourunitisoperating,theremaybeaproblem.For

example, poorly performing burners can produce unfa-

miliar noises.

Ifyousmellanyunusualodors,yourunitmay beoperat-

ing improperly. For example, units can give off unfamil-

iar odors if components are required to operate in ab-

normal conditions.

Lookforvisiblesignsofamalfunctioningunit.Examples

includeunusualamountsofcondensateonwindows in-

side your house, visibly burnt components or unusual

dirt or rust accumulations on the vent pipe or in the unit.

If you experience headache, nausea, fatigue, or dizzi-

ness, thecause couldbeexposure to carbonmonoxide

gas. This is often misdiagnosed as the flu because

symptoms are similar. If you suffer from flu-like symp-

toms that are exaggerated at home, but seem to sub-

side while you are away from the house, exposure to

carbon monoxide could be the cause.

Your vigilance may pay off in early detection of a problem

before either personal injury or property damage occurs.

Do not hesitate to contact a qualified service technician as

an investment in your well being.

Page 6

Planned Service

Youshould expectaservicetechniciantocheck the follow-

ing items during an annual inspection. Power to the unit

must be shut off for the service technician’s safety.

Fresh air grilles and louvers (on the unit and in the room

where the furnace is installed) - Must be open and unob-

structed to provide combustion air.

Burners - Must be inspected for rust, dirt, or signs of water.

Vent pipe -Mustbeinspectedforsigns of water, damaged

or sagging pipe, or disconnected joints.

Unit appearance - Must be inspected for rust, dirt, signs

of water, burnt or damaged wires, or components.

Blower access door - Must be properly in place and pro-

vide a seal between the return air and the room where the

furnace is installed.

Return air duct - Must be properly attached and provide

an air seal to the unit.

Operating performance - Unit must be observed during

operationtomonitorproperperformanceoftheunitandthe

vent system.

Combustion gases -Flueproducts mustbe analyzedand

compared to the unit specifications.

Problems detected during the inspection may make it nec-

essary to temporarily shut down the furnace untilthe items

can be repaired or replaced.

Pay attention to your furnace. Situations can arise be-

tweenannualfurnaceinspectionsthatmayresultinunsafe

operation.Forinstance,itemsinnocently storednexttothe

furnacemayobstructthe combustionairsupply.Thiscould

cause incomplete combustion and the production of car-

bon monoxide gas.

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