Lenoxx Electronics Furnace G24MCE User Manual

PRODUCT LITERATURE  
1999 Lennox Industries Inc.  
Dallas, Texas  
503,208M  
9/99  
Supersedes 9/98  
G24MCE  
SERIES  
GAS-FIRED  
FURNACE  
RETAIN THESE INSTRUCTIONS  
FOR FUTURE REFERENCE  
Litho USA  
WARNING  
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 store or use petrol or other  
flammable vapours and liquids in the  
vicinity of this or any other appliance.  
Do not touch any electrical switch; do not  
use any telephone in your building.  
Immediately call your gas supplier from a  
neighbor's telephone. Follow the gas supĆ  
plier's instructions.  
Installation and service must be perĆ  
formed by a qualified installer, serĆ  
vice agency or the gas supplier.  
If you cannot reach your gas supplier, call  
the local fire brigade.  
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Important Directions  
WARNING  
Carbon monoxide gas is invisible, odorless, and  
toxic.  
1 - Keep the furnace area clear and free of combustible  
material, petrol, and other flammable vapours and liqĆ  
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 furĆ  
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.  
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 (including lawn mowers, automobiles, and  
fireplaces) has the potential to produce carbon monĆ  
oxide gas. Because of this, Lennox recommends the  
use of a carbon monoxide detector in your home,  
even if you do not own gas appliances. Reliable deĆ  
tectors are available at reasonable retail prices. ConĆ  
tact your independent Lennox dealer for more details  
about this investment in your safety.  
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 nationĆ  
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 opĆ  
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 inĆ  
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 proĆ  
duction of carbon monoxide gas. Complete combustion  
of the gas requires, but is not limited to, correct gas presĆ  
sure and gas flow rate, adequate combustion, air, and  
proper venting.  
Page 3  
 
Lighting Information and Operation  
Filters  
G24MCEseriesunitsareequippedwithexternal filters  
which should be inspected monthly and replaced when  
necessary to assure proper furnace operation. See  
table 1 for filter sizes. Replacement filters used with  
G24MCE-40/60/75 units must have a minimum velocĆ  
ity rating of 2 m/s (400 FPM). Replacement filters used  
with G24MCE-100/120/140 units require a minimum  
velocity rating of 3.2 m/s (625 FPM). Figures 2 and 3  
show possible filter locations when the units are  
installed in the upflow position.  
WARNING  
If you do not follow these instructions exactly, 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.  
Placing Furnace Into Operation  
TABLE 1  
G24MCE units are equipped with an electronic ignition sysĆ  
tem. Do not attempt to manually light burners on these furĆ  
naces. Each time the thermostat calls for heat, the burner  
will automatically light.  
FILTER SIZE -  
MODEL NO.  
millimeters (inches)  
406X508X25  
G24MCE-45/60/75  
(16 X 20 X 1)  
THERMOSTATS  
508X508X25  
G24MCE-100/120/140  
(20 X 20 X 1)  
UPFLOW FURNACE  
BOTTOM RETURN AIR  
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 - 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.  
6- Turn on all electrical power to the unit.  
7- Set the thermostat to desired setting.  
NOTE-When unit is first started, steps 1 through 7 may  
FIGURE 2  
need to be repeated to purge air from gas line.  
8- If the appliance still will not operate, follow the  
instructions Turning Off Gas To Unit" and call your  
service technician or gas supplier.  
Turning Off Gas To Unit  
1 - Set the thermostat to the lowest setting.  
2 - Turn off all electrical power to the unit if service is to  
be performed.  
Page 4  
 
UPFLOW FURNACE  
SIDE RETURN AIR  
BURNER FLAME  
FLAME  
FLAME APPEARS BLUE IF  
BURNING NAT. GAS; BLUE/  
YELLOW FOR PROPANE.  
HEAT  
EXCHANGER  
TUBE  
BURNER  
VEST  
PANEL  
FIGURE 4  
Venting System Inspection  
Annually (before heating season) inspect furnace venting  
system, vent cap, heat exchanger and burners for corroĆ  
sion, deterioration, or deposits of debris. Remove any obĆ  
structions.  
FIGURE 3  
Contact your Lennox dealer for a periodic unit inspection  
by a qualified gas service engineer.  
Fan  
Capillary Tube Limit Switch  
Check and clean fan wheel for any debris. Fan motor is  
prelubricated for extended bearing life. No further lubricaĆ  
tion is needed.  
Your Lennox furnace is equipped with a manuallyĆreset  
capillary tube limit switch which shuts off the gas supply to  
the furnace in the event of inadequate supply air (high air  
temperature). It is located on the vestibule panel near the  
gas valve. To reset this control, push the switch on the  
face of the control sideways. If this switch opens again,  
consult a qualified gas service engineer.  
WARNING  
Fan door must be securely in place when fan and  
burners are operating. Gas fumes, which could  
contain carbon monoxide, can be drawn into living  
space resulting in personal injury or death.  
Control Board Lockouts  
Several types of control board lockout modes exist on this  
furnace. When in one of these modes, the control board  
will not allow the furnace to start. The two modes that can  
be manually reset are: a Watchguard lockout mode," and  
a Hard lockout mode."  
To reset the Watchguard mode," manually switch the therĆ  
mostat from HEAT to OFF and then back to HEAT again.  
(Note - This lockout mode will also automatically reset after  
a 60 minute lockout period.)  
The Hard lockout mode" can be reset by turning the elecĆ  
trical power OFF and then back ON again.  
If either of these two lockouts reoccur, or if the original lockĆ  
out cannot be reset, call a qualified gas service engineer.  
Burner Flame  
The G24MCE burner flame is not adjustable; however,  
the flame should be inspected at the beginning of each  
heating season and burners should be cleaned, if necesĆ  
sary. Burner flame should be blue when burning natural  
gas, blue/yellow when burning propane gas.  
Page 5  
 
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.  
Service Reminder  
Call your Lennox service technician if unit is inoperative.  
Before calling, always check the following to be sure serĆ  
vice is required.  
Planned Service  
1 - Check that electrical isolator switches are ON.  
2 - Check room thermostat for proper setting.  
3 - Replace any blown fuses or reset circuit breakers.  
4 - Air filter should not be clogged limiting air flow.  
5 - Is gas turned on at meter?  
You should expect a service technician to check the folĆ  
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 unobĆ  
structed to provide combustion air.  
6 - Is manual gas cock 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.  
Burners- Must be inspected for rust, dirt, or signs of waĆ  
ter.  
Vent pipe - Must be inspected for signs of water, damĆ  
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 furĆ  
nace is installed.  
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.  
S 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.  
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.  
S If you smell any unusual odors, your unit may be operĆ  
ating improperly. For example, units can give off unfaĆ  
miliar odors if components are required to operate in  
abnormal conditions.  
Combustion gases - Flue products must be analyzed  
and compared to the unit specifications.  
S Look for visible signs of a malfunctioning unit. ExamĆ  
ples include unusual amounts of condensate on winĆ  
dows inside your house, visibly burnt components or  
unusual dirt or rust accumulations on the vent pipe or  
in the unit.  
Problems detected during the inspection may make it  
necessary to temporarily shut down the furnace until the  
items can be repaired or replaced.  
S If you experience headache, nausea, fatigue, or dizziĆ  
ness, the cause could be exposure to carbon monoxĆ  
ide gas. This is often misdiagnosed as the flu because  
symptoms are similar. If you suffer from flu-like sympĆ  
toms that are exaggerated at home, but seem to subĆ  
side while you are away from the house, exposure to  
carbon monoxide could be the cause.  
Pay attention to your furnace. Situations can arise beĆ  
tween annual furnace inspections that may result in unĆ  
safe operation. For instance, items innocently stored next  
to the furnace may obstruct the combustion air supply.  
This could cause incomplete combustion and the producĆ  
tion of carbon monoxide gas.  
Page 6  
 

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