Lennox International Inc Furnace G24M SERIES User Manual

G24M  
503,877M  
02/99  
Supersedes 9/98  
SERIES  
50HZ  
GAS FURNACE  
RETAIN THESE INSTRUCTIONS  
FOR FUTURE REFERENCE  
Litho USA  
:$51,1*  
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.  
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.  
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.  
If you cannot reach your gas supplier, call  
the fire department.  
 
(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.  
Important Directions  
1 - Keep the furnace area clear and free of combustible  
material, gasoline, and other flammable vapors and liq-  
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.  
Your furnace is designed to meet standards set by nation-  
al agencies, and to operate safely when properly installed  
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  
critical for your safety and the satisfactory operation of the  
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.  
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), is installed. When return air is drawn from a  
room, a negative pressure is created in the room. If a  
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  
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.  
Your furnace is designed to meet standards set by nation-  
al agencies, and to operate safely when properly installed  
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  
critical for your safety and the satisfactory operation of the  
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.  
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 pres-  
sure and gas flow rate, adequate combustion, air, and  
proper venting.  
Lighting Information and Operation  
WARNING  
WARNING  
If you do not follow these instructions exactly, a fire  
or explosion may result causing property damage,  
personal injury or loss of life.  
Carbon monoxide gas is invisible, odorless, and  
toxic.  
Exposure to this gas can cause personal injury and even  
death to all occupants, including pets. Any item that is  
powered by or gives off heat from a combustion process  
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.  
 
Placing Furnace Into Operation  
HONEYWELL VR8205 SERIES GAS VALVE  
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.  
ON  
OFF  
THERMOSTATS  
GAS VALVE SHOWN IN OFF POSITION  
FIGURE 3  
8 - 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.  
FIGURE 1  
10- Turn on all electrical power to unit.  
Gas Valve Operation  
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.  
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.  
12- If the appliance will not operate, follow the instruc-  
tions “Turning Off Gas to Unit” and call your service  
technician or gas supplier.  
4 - This furnace Is equipped with an ignition device  
which automatically lights the burner. Do not try to  
light the burner by hand.  
Turning Off Gas to Unit  
1 - Set the thermostat to the lowest setting.  
5 - Remove the access panel.  
2 - Turn off all electrical power to the unit if service is to  
be performed.  
6 - White Rodgers 36E Gas Valve - Turn knob on gas valve  
180 either way to OFF. See figure 2.  
3 - Remove the access panel.  
Honeywell VR8205 Gas Valve - Turn knob on gas valve  
4 - Turn knob on White Rodgers gas valve 180 either way  
clockwise  
to OFF. Do not force. See figure 3.  
to OFF; turn knob on Honeywell valve clockwise  
to  
OFF. Do not force.  
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.  
5 - Replace the access panel.  
Filters  
G24M series units are equipped with external filters which  
should be inspected monthly and replaced when neces-  
sary to assure proper furnace operation. See table 1 for  
filter sizes. Replacement filters used with G24M-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.  
WHITE RODGERS 36E SERIES GAS VALVE  
TABLE 1  
FILTER SIZE  
MODEL NUMBER  
1 FILTER  
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.  
2 FILTERS  
GAS VALVE SHOWN IN OFF POSITION  
G24M-45/60/75  
FIGURE 2  
 
DOWNFLOW FURNACE  
FILTERS IN PLENUM RACK  
UPFLOW FURNACE  
BOTTOM RETURN AIR  
FIGURE 6  
FIGURE 4  
Blower  
Check and clean blower wheel for any debris. Blower mo-  
tor is prelubricated for extended bearing life. No further lu-  
brication is needed.  
UPFLOW FURNACE  
SIDE RETURN AIR  
WARNING  
Blower door must be securely in place when blower  
and burners are operating. 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  
FIGURE 5  
FLAME APPEARS BLUE IF  
BURNING NAT. GAS; BLUE/  
YELLOW FOR PROPANE.  
HEAT  
EXCHANGER  
TUBE  
VEST  
PANEL  
FIGURE 7  
 
If you experience headache, nausea, fatigue, or dizzi-  
ness, the cause could be exposure to carbon monox-  
ide 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.  
Venting System Inspection  
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.  
Contact your Lennox dealer for a periodic unit inspection  
by a qualified service technician.  
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 qualifiedservice technicianas  
an investment in your well being.  
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.  
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.  
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.  
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.  
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.  
Fan access door - Must be properly in place and provide  
a seal between the return air and the room where the fur-  
nace is installed.  
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.  
Return air duct - Must be properly attached and provide  
an air seal to unit.  
Safety Precautions  
Operating performance - Unit must be observed during  
operation to monitor proper performance of the unit and  
the vent system.  
If you discover any of the following, shut down your  
unit, and contact an independent Lennox dealer for  
an inspection by a qualified technician.  
Combustion gases - Flue products must be analyzed  
and compared to the unit specifications.  
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.  
Problems detected during the inspection may make it  
necessary to temporarily shut down the furnace until the  
items can be repaired or replaced.  
If you smell any unusual odors, 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.  
Pay attention to your furnace. Situations can arise be-  
tween annual furnace inspections that may result in un-  
safe operation. For instance, items innocently stored next  
to the furnace may obstruct the combustion air supply.  
This could cause incomplete combustion and the produc-  
tion of carbon monoxide gas.  
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.  
 

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