Lennox G24M SERIES Guide

Page 1

WHAT TO DO IF YOU SMELL GAS:

If the information in this manual is not

followed exactly, a fire or explosion

may result causing property damage,

personal injury or loss of life.

:$51,1*

Do not store or use gasoline or other

flammable vapors and liquids in the

vicinity of this or any other appliance.

Installation and service must be per-

formed by a qualified installer, ser-

vice agency or the gas supplier.

Do not try to light any appliance.

Do not touch any electrical switch; do not

use any phone in your building.

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.

Extinguish any open flames.

RETAIN THESE INSTRUCTIONS

FOR FUTURE REFERENCE Litho USA

G24M

SERIES

50HZ

GAS FURNACE

503,877M

02/99

Supersedes 9/98

352'8&7 /,7(5$785(

 /HQQR[ ,QGXVWULHV ,QF

'DOODV 7H[DV

Page 2

G24M PARTS IDENTIFICATION

UPFLOW POSITION DOWNFLOW POSITION

1 - COMBUSTION AIR

BLOWER

2 - PRESSURE SWITCH

3- GASVALVE

4 - ROLLOUT SWITCH

(One on each side)

5 - BURNERS

6 - CONTROL BOARD

7- BLOWER

8 - TRANSFORMER

9 - BLOWER DOOR

INTERLOCK SWITCH

WARNING

Productcontainsfiberglasswool.Disturbingthe

insulation in this product during installation,

maintenance, or repair will expose you to fiber-

glass wool. Breathing this may cause lung can-

cer. (Fiberglass wool is known to the State of

Californiatocausecancer.)Fiberglasswoolmay

alsocauserespiratory,skin,andeyeirritation.To

reduceexposuretothissubstanceorforfurther

information,consult materialsafety datasheets

available from address shown below, or contact

your supervisor.

Lennox Industries Inc.

P.O. Box 799900

Dallas, TX 75379-9900

WARNING

If overheating occurs or if gas supply fails to shut

off, shut off the manual gas valve to the appliance

before shutting off electrical supply.

WARNING

Do not use this furnace if any part has been under-

water. Immediately call a qualified service techni-

cian to inspect the furnace and to replace any part

of the control system and any gas control which

has been under water.

CAUTION

Before attempting to perform any service or mainte-

nance, turn the electrical power to unit OFF at discon-

nect switch.

IMPORTANT

Anyadditions,changes,orconversionsrequiredin

orderfortheappliancetosatisfactorilymeettheap-

plication needs must be made by a Lennox service

technician using factory specified and approved

parts.

Page 3

Important Directions

1 - Keep the furnace area clear and free of combustible

material,gasoline,andotherflammablevaporsandliq-

uids. If installed in an insulated area, furnace must be

kept free of insulating material. Insulating material may

be combustible. Inspect furnace venting system to

make sure it is in place, physically sound, and without

holes, corrosion, or blockage. Inspect furnace return

air duct connection to ensure duct is sealed to the fur-

nace and terminates outside the space containing the

furnace. Inspect the physical support of the furnace to

guarantee that it is sound without sagging, cracks or

gaps around base and it maintains seal between base

and support.

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- DO NOT draw return air from a room where this

furnace, or any other gas appliance (ie., a water

heater),isinstalled.Whenreturnairisdrawnfroma

room, anegativepressure iscreatedin theroom.Ifa

gas appliance is operating in a room with negative

pressure, the flue products can be pulled back down

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

thefluegasmayresultinincompletecombustionand

theformationofcarbonmonoxidegas.Thistoxic gas

might then be distributed throughout the house by

the furnace duct system.

Yourfurnaceisagasappliance. It iscriticalthatthegas

suppliedtotheunitbecompletelyburnedtoavoidthepro-

duction of carbon monoxide gas. Complete combustion

of the gas requires, but is not limited to, correct gas pres-

sure and gas flow rate, adequate combustion, air, and

proper venting.

WARNING

Carbon monoxide gas is invisible, odorless, and

toxic.

Exposuretothisgascancausepersonalinjuryandeven

death to all occupants, including pets. Any item that is

(including lawn mowers, automobiles, and fireplaces)

has the potential to produce carbon monoxide gas. Be-

cause of this, Lennox recommends the use of a car-

bon monoxide detector in your home, even if you do

not own gas appliances. Reliable detectors are avail-

able at reasonable retail prices. Contact your indepen-

dent Lennox dealer for more details about this invest-

ment in your safety.

Yourfurnaceisdesignedtomeetstandardssetbynation-

alagencies,andtooperatesafelywhenproperlyinstalled

and maintained. However, the unit’s performance can be

greatly impacted by the individual installation and the op-

erating environment. It is your responsibility to ensure

that this appliance is maintained. Proper maintenance is

criticalforyoursafetyandthesatisfactoryoperationofthe

product. Lennox strongly recommends annual in-

spection and maintenance of this appliance. Contact

your independent Lennox dealer for an inspection by a

qualified service technician.

Yourfurnaceisdesignedtomeetstandardssetbynation-

alagencies,andtooperatesafelywhenproperlyinstalled

and maintained. However, the unit’s performance can be

greatly impacted by the individual installation and the op-

erating environment. It is your responsibility to ensure

that this appliance is maintained. Proper maintenance is

criticalforyoursafetyandthesatisfactoryoperationofthe

product. Lennox strongly recommends annual in-

spection and maintenance of this appliance. Contact

your independent Lennox dealer for an inspection by a

qualified service technician.

Lighting Information and Operation

WARNING

If you do notfollow these instructionsexactly, a fire

or explosion may result causing property damage,

personal injury or loss of life.

BEFORE LIGHTING smell all around the appliance area

for gas. Be sure to smell next to the floor because some

gas is heavier than air and will settle on the floor.

Page 4

Placing Furnace Into Operation

G24M units are equipped with an electronic ignition system.

Do not attempt to manually light burners on these furnaces.

Each time the thermostat calls for heat, the burner will auto-

matically light.

Use only your hand to turn the gas control knob. Never use

tools. If the knob will not turn by hand, do not try to repair it,

call a qualified service technician. Force or attempted repair

may result in a fire or explosion.

THERMOSTATS

FIGURE 1

Gas Valve Operation

1- STOP! Read the safety information at the beginning

of this section.

2 - Set the thermostat to lowest setting. See figure 1.

3 - Turn off all electrical power to the unit.

4 - This furnace Is equipped with an ignition device

which automatically lights the burner. Do not try to

light the burner by hand.

5 - Remove the access panel.

White Rodgers 36E Gas Valve -

Turn knob on gas valve

180

either way to OFF. See figure 2.

Honeywell VR8205 Gas Valve -

Turn knob on gas valve

clockwise to OFF.Donotforce.Seefigure3.

7 - Wait five (5) minutes to clear out any gas. If you then

smell gas, STOP! Immediately call your gas supplier

from a neighbor’s phone. Follow the gas supplier’s

instructions. If you do not smell gas go to next step.

WHITE RODGERS 36E SERIES GAS VALVE

GAS VALVE SHOWN IN OFF POSITION

2))

FIGURE 2

OFF

HONEYWELL VR8205 SERIES GAS VALVE

GAS VALVE SHOWN IN OFF POSITION

FIGURE 3

White Rodgers 36E Gas Valve -

Turn knob on gas

valve 180

either way to ON.

Honeywell VR8205 Gas Valve -

Turn knob on gas

valve counterclockwise to ON. Do not force.

9 - Replace the access panel.

10- Turn on all electrical power to 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 instruc-

tions “Turning Off Gas to Unit” and call your service

technician or gas supplier.

TurningOffGastoUnit

1 - Set the thermostat to the lowest setting.

2 - Turn off all electrical power to the unit if service is to

be performed.

3 - Remove the access panel.

4 - TurnknobonWhiteRodgersgas valve180

eitherway

to OFF; turn knob on Honeywell valve clockwise to

OFF. Do not force.

5 - Replace the access panel.

Filters

G24Mseriesunitsareequippedwithexternalfilterswhich

should be inspected monthly and replaced when neces-

sary to assure proper furnace operation. See table 1 for

filtersizes.ReplacementfiltersusedwithG24M-40/60/75

units must have a minimum velocity rating of 400 FPM.

Replacement filters used with G24M-100/120/140 units

require a minimum velocity rating of 625 FPM. Figures 4,

5 and 6 show possible filter locations.

TABLE 1

FILTER SIZE

MODEL NUMBER

UPFLOW DOWNFLOW

1FILTER 2FILTERS

G24M-45/60/75 16 in. X 20 in. X 1 in. 16 in. X 20 in. X 1 in.

G24M-100/120/140 20 in. X 20 in. X 1 in. 16 in. X 20 in. X 1 in.

Page 5

UPFLOW FURNACE

BOTTOM RETURN AIR

FIGURE 4

UPFLOW FURNACE

SIDE RETURN AIR

FIGURE 5

DOWNFLOW FURNACE

FILTERS IN PLENUM RACK

FIGURE 6

Blower

Checkandcleanblowerwheelforanydebris.Blowermo-

torisprelubricatedforextendedbearinglife.Nofurtherlu-

brication is needed.

WARNING

Blowerdoormustbe securelyinplacewhen blower

and burners areoperating. Gas fumes,which could

contain carbon monoxide, can be drawn into living

space resulting in personal injury or death.

Burner Flame

The G24M burner flame is not adjustable; however, the

flame should be inspected at the beginning of each heat-

ing season and burners should be cleaned, if necessary.

Burner flame should be blue when burning natural gas,

blue/yellow when burning propane gas.

BURNER FLAME

BURNER

FLAME

HEAT

EXCHANGER

TUBE

VEST

PANEL

FLAME APPEARS BLUE IF

BURNING NAT. GAS; BLUE/

YELLOW FOR PROPANE.

FIGURE 7

Page 6

Venting System Inspection

Annually(beforeheatingseason)inspectfurnaceventing

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

sion,deterioration,ordepositsofdebris.Removeanyob-

structions.

Contact your Lennox dealer for a periodic unit inspection

by a qualified service technician.

Flame Rollout Safety Switches

Your Lennox furnace is equipped with two flame roll-out

safety switches which shut off the gas supply to the fur-

nace in case of heat exchanger blockage. If the furnace

fails to operate due to the functioning of these safety

switches, DO NOT attempt to place the furnace into op-

eration. Contact a qualified service technician.

Service Reminder

Call your Lennox service technician if unit is inoperative.

Before calling, always check the following to be sure ser-

vice 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 limiting air flow.

6 - Is gas turned on at meter?

7 - Is manual main shut-off valve open?

To keep your Lennox gas heating system in peak operat-

ing condition year after year, contact your independent

Lennox dealer about a planned service program.

Safety Precautions

If you discover any of the following, shut down your

unit, and contact an independent Lennox dealer for

an inspection by a qualified technician.

If you repeatedly hear any new or unfamiliar sounds

while your unit is operating, there may be a problem.

For example, poorly performing burners can produce

unfamiliar noises.

If you smell any unusualodors, your unit may be oper-

ating improperly. For example, units can give off unfa-

miliar odors if components are required to operate in

abnormal conditions.

Look for visible signs of a malfunctioning unit. Exam-

ples include unusual amounts of condensate on win-

dows inside 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, the cause could be exposure to carbon monox-

ide gas. This is often misdiagnosed as theflu 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.

Donothesitatetocontactaqualifiedservicetechnicianas

an investment in your well being.

Planned Service

You should expect a service technician to check the fol-

lowing items during an annual inspection. Power to the

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

Freshairgrillesandlouvers(ontheunitandintheroom

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 wa-

ter.

Vent pipe - Must be inspected for signs of water, dam-

aged or sagging pipe, or disconnected joints.

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

of water, burnt or damaged wires, or components.

Fanaccess door- Must be properly in placeand provide

a seal between the return air and the room where the fur-

nace is installed.

Return air duct - Must be properly attached and provide

an air seal to unit.

Operating performance - Unit must be observed during

operation to monitor proper performance of the unit and

the vent system.

Combustion gases - Flue products must be analyzed

and compared to the unit specifications.

Problems detected during the inspection may make it

necessary to temporarily shut down the furnace until the

items can be repaired or replaced.

Pay attention to your furnace. Situations can arise be-

tween annual furnace inspections that may result in un-

safeoperation.Forinstance,itemsinnocentlystorednext

to the furnace may obstruct the combustion air supply.

Thiscouldcauseincompletecombustionandtheproduc-

tion of carbon monoxide gas.

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