Page 1
352'8&7 /,7(5$785(
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'DOODV 7H[DV
£
503,877M
02/99
Supersedes 9/98
G24M
SERIES
50HZ
GAS FURNACE
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
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.
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity ofthis or any other appliance.
Installation and service must be performed by a qualified installer, service agency or the gas supplier.
Litho USA
:$51,1*
WHAT TO DO IF YOU SMELL GAS:
Do not try to light any appliance.
Extinguish any open flames.
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.
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G24M PARTS IDENTIFICATION
7
9
1
2
3
4
5
6
8
9
UPFLOW 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
7
DOWNFLOW POSITION
8
6
1
2
3
4
5
WARNING
Productcontai nsfiberglass wool.Distu rbingthe
insulation in this p roduct during installation,
maintenance, o r repair will expose you to fiberglass wool. Breathi ng this may cause lung cancer. (Fiberglass wool is known to the State of
California tocausecance r.)Fiberglasswoolmay
alsocau ser espirat ory, skin,and eyeirritation.To
reduceexposuretothis substanceor for further
informatio n, consul t material safety data sheets
available from ad dress sho wn be low, or contact
your supervisor.
Lennox Indust ries Inc.
P.O. Box 799900
Dallas, T X 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 underwater. Immediately call a qualified service technician 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 maintenance, turn the electrical power to unit OFF at disconnect switch.
IMPORTANT
Anyadditions, changes,or conversionsrequired in
orderforthe applianceto satisfactorilymeetthe application needs must be made by a Lennox service
technician using factory specified and approved
parts.
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Important Directions
1 - Keep the furnace area clear and free of combustible
material,gasoline,and other flammablevaporsandliquids. If installed in an insulated area, furnace must be
kept free of insulating material. Insulating materialmay
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 furnace 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 nearunit 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),is installed.
room, anegative pressureis created in the room. 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
thefluegas mayresult inincompletecombustionand
theformation ofcarbon monoxidegas. This toxicgas
might then be distributed throughout the house by
the furnace duct system.
Your furnace is a gas appliance.
suppliedtotheunitbe completelyburned toavoid theproduction 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.
Whenreturnair isdrawn froma
Itis criticalthat thegas
(including lawn mowers, automobiles, and fireplaces)
has the potential to produce carbon monoxide gas. Because of this,
bonmonoxide detector in your home,even if you do
not own gas appliances.
able at reasonable retail prices. Contact your independent Lennox dealer for more details about this investment in your safety.
Yourfurnaceis designedto meetstandardsset by nationalagencies, andto operatesafely when properlyinstalled
and maintained. However,the unit’s performance can be
greatly impacted by the individual installation and the operating environment. It is your responsibility to ensure
that this appliance is maintained. Proper maintenance is
criticalfor yoursafetyandthe satisfactory operationof the
product.
spection and maintenance of this appliance.
your independent Lennox dealer for an inspection by a
qualified service technician.
Yourfurnaceis designedto meetstandardsset by nationalagencies, andto operatesafely when properlyinstalled
and maintained. However,the unit’s performance can be
greatly impacted by the individual installation and the operating environment. It is your responsibility to ensure
that this appliance is maintained. Proper maintenance is
criticalfor yoursafetyandthe satisfactory operationof the
product.
spection and maintenance of this appliance.
your independent Lennox dealer for an inspection by a
qualified service technician.
Lennox recommends the use of a car-
Reliable detectors are avail-
Lennox strongly recommends annual in-
Contact
Lennox strongly recommends annual in-
Contact
Lighting Information and Operation
WARNING
Carbon monoxide gas is invisible, odorless, and
toxic.
Exposureto thisgas cancausepersonal injuryand even
death to all oc c upants, including pets. Any item that is
poweredby or gives offheat from a combustion process
WARNING
Ifyou do not follow 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.
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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 automatically 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.
HONEYWELL VR8205SERIES GAS VALVE
ON
OFF
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 Rodgers36E Gas Valve -
6-
Turn knob on gas valve
180qeither way to OFF. See figure 2.
Honeywell VR8205 Gas Valve -
clockwise
to OFF .Donotforce.Seefigure3.
Turn knob on gas valve
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.
GAS VALVE SHOWN IN OFF POSITION
FIGURE 3
White Rodgers 36E Gas Valve -
8-
Turn knob on gas
valve 180qeither way to ON.
Honeywell VR8205 Gas Valve -
valve counterclockwise
Turn knob on gas
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 - Turnknobon White Rodgers gas valve180qeitherway
to OFF; turn knob on Honeywell valve clockwise
OFF. Do not force.
5 - Replace the access panel.
Filters
to
WHITE RODGERS 36E SERIES GAS VALVE
12
2))
GAS VALVE SHOWN IN OFF POSITION
FIGURE 2
Page 4
G24Mseries unitsareequippedwithexternalfilterswhich
should be inspected monthly and replaced when necessary to assure proper furnace operation. See table 1 for
filtersizes. Replacementfiltersused withG24M-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
FILTERSIZE
MODEL NUMBER
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.
UPFLOW DOWNFLOW
1FILTER 2FILTERS
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UPFLOW FURNACE
BOTTOM RETURN AIR
FIGURE 4
UPFLOW FURNACE
SIDE RETURN AIR
DOWNFLOW FURNACE
FIL TERS IN PLENUM RACK
FIGURE 6
Blower
Checkand cleanblower wheel forany debris. Blower motorisprelubricatedfor extendedbearinglife. Nofurtherlubrication is needed.
WARNING
Blowerdoor must besecurely in place whenblower
andburners are operating. Gas fumes, which could
contain carbon monoxide, can be drawn into living
space resulting in personal injury or death.
FIGURE 5
Burner Flame
The G24M burner flame is not adjustable; however, the
flame should be inspected at the beginning of each heating 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
FLAME APPEARS BLUE IF
BURNING NAT. GAS; BLUE/
YELLOW FOR PROPANE.
BURNER
FIGURE 7
FLAME
EXCHANGER
VEST
PANEL
HEAT
TUBE
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Venting System Inspection
Annually(before heatingseason)inspect furnace venting
system, vent cap, heat exchanger and burners for corrosion,deterioration,or depositsof debris. Remove anyobstructions.
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 furnace 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 operation. 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 service is required.
1 - Check that electrical disconnect switches are
2 - Check room thermostat for proper setting.
3 - Replace any blown fuses or reset circuit breakers.
4 - Gas valve should beON.
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 operating condition year after year, contact your independent
Lennox dealer about a planned service program.
ON.
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.
:
Ifyousmellanyunusualodors, yourunitmay beoperating improperly.For example, units can give off unfamiliar odors if components are required to operate in
abnormal conditions.
:
Look for visible signs of a malfunctioning unit. Examples include unusual amounts of condensate on windows 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 dizziness, the cause could be exposure to carbon monoxidegas.This is often misdiagnosed as the flu because
symptoms are similar. If you suffer from flu-like symptoms that are exaggerated at home, but seem to subside 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.
Donothesitateto contactaqualifiedservicetechnicianas
an investment in your well being.
Planned Service
You should expect a service technician to check the following items during an annual inspection. Power to the
unit must be shut off for the service technician’s safety.
Freshair grilles and louvers
where the furnace is installed) - Must be open and unobstructed to provide combustion air.
Burners
ter.
Vent pipe
aged or sagging pipe, or disconnected joints.
Unit appearance
of water, burnt or damaged wires, or components.
Fanaccess door
a seal between the return air and the room where the furnace is installed.
Return air duct
an air seal to unit.
Operating performance
operation to monitor proper performance of the unit and
the vent system.
Combustion gases
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.
tween annual furnace inspections that may result in unsafeoperation. Forinstance,items innocently storednext
to the furnace may obstruct the combustion air supply.
Thiscould cause incompletecombustionand the production of carbon monoxide gas.
- Must be inspected for rust, dirt, or signs of wa-
- Must be inspected for signs of water, dam-
- Must be inspected for rust, dirt, signs
- Mustbeproperlyin place and provide
- Must be properly attached and provide
- Flue products must be analyzed
(ontheunit andin theroom
- Unit must be observed during
Situations can arise be-
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