Lenoxx Electronics Furnace 80MGF User Manual

PRODUCT LITERATURE  
1999 Lennox Industries Inc.  
Dallas, Texas  
503,100M  
7/99  
Supersedes 9/98  
80MGF  
SERIES  
GAS 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 gasoline or other  
flammable vapors and liquids in the  
vicinity of this or any other 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.  
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 fire department.  
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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.  
Important Directions  
1 - Keep the furnace area clear and free of combustible  
material, gasoline, and other flammable vapors 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.  
Lighting Information and Operation  
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.  
WARNING  
If you do not follow these instructions exactly, a fire  
or explosion may result causing property damage,  
personal injury or loss of life.  
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.  
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.  
Use only your hand to push in or turn the gas control  
knob. Never use tools. If the knob will not push in or 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.  
To place 80MGF furnace into operation:  
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.  
80MGF units are equipped with an electronic ignition  
system. Do not attempt to manually light burners on  
these furnaces. Each time thermostat calls for heat, the  
burner will automatically light.  
Gas Valve Operation (Figures 2 and 3)  
1 - STOP! Read the safety information at the beginning  
of this section.  
2 - Set thermostat to lowest setting. See figure 1.  
WARNING  
Carbon monoxide gas is invisible, odorless, and  
toxic.  
THERMOSTATS  
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 fireĆ  
places) has the potential to produce carbon monoxide  
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 detectors  
are available at reasonable retail prices. Contact your  
independent Lennox dealer for more details about this  
investment in your safety.  
FIGURE 1  
3 - Turn off all electrical power to appliance.  
4 - This appliance 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.  
Page 3  
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6 - White Rodgers 36E Gas Valve - Switch gas valve lever  
to OFF. See figure 2.  
Honeywell VR8205 Gas Valve - Turn knob on gas valve  
To Turn Off Gas To Unit  
1 - Set thermostat to lowest setting.  
2 - Turn off all electrical power to unit if service is to be  
performed.  
clockwise  
to OFF. Do not force. See figure 3.  
3 - Remove the access panel.  
WHITE RODGERS 36E SERIES GAS VALVE  
4 - Switch lever on White Rodgers gas valve to OFF; turn  
knob on Honeywell valve clockwise  
force.  
to OFF. Do not  
5 - Replace the access panel.  
Filters  
80MGF series units are equipped with external 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 80MGF-40/60/75 units must have a minimum veĆ  
locity rating of 400 FPM. Replacement filters used  
with 80MGF-100/120/140 units require a minimum  
velocity rating of 625 FPM. Figures 4, 5, and 6 show  
possible filter locations.  
GAS VALVE SHOWN IN OFF POSITION  
FIGURE 2  
HONEYWELL VR8205 SERIES GAS VALVE  
TABLE 1  
FILTER SIZE  
UPFLOW  
DOWNFLOW  
MODEL NUMBER  
1 FILTER  
2 FILTERS  
ON  
80MGF-45/60/75  
16 in. X 20 in. X 1 in. 16 in. X 20 in. X 1 in.  
80MGF-100/120/140 20 in. X 20 in. X 1 in. 16 in. X 20 in. X 1 in.  
OFF  
GAS VALVE SHOWN IN OFF POSITION  
UPFLOW FURNACE  
BOTTOM RETURN AIR  
FIGURE 3  
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.  
8 - White Rodgers 36E Gas Valve - Switch gas valve lever  
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 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 still will not operate, follow the  
instructions To Turn Off Gas To Unit" and call your  
service technician or gas supplier.  
FIGURE 4  
Page 4  
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Burner Flame  
UPFLOW FURNACE  
SIDE RETURN AIR  
The 80MGF 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 burnĆ  
ing natural gas, blue/yellow when burning propane  
gas.  
BURNER FLAME  
FLAME  
FLAME APPEARS BLUE IF  
BURNING NAT. GAS; BLUE/  
YELLOW FOR PROPANE.  
HEAT  
EXCHANGER  
TUBE  
BURNER  
VEST  
PANEL  
FIGURE 5  
FIGURE 7  
DOWNFLOW FURNACE  
FILTERS IN PLENUM RACK  
Venting System Inspection  
Annually (before heating season) inspect furnace  
venting system, vent cap, heat exchanger and burnĆ  
ers for corrosion, deterioration, or deposits of debris.  
Remove any obstructions.  
Contact your Lennox dealer for a periodic unit inspecĆ  
tion 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.  
FIGURE 6  
Service Reminder  
Call your Lennox service technician if unit is inoperaĆ  
tive. Before calling, always check the following to be  
sure service is required.  
Blower  
1 - Check that electrical disconnect switches are ON.  
2 - Are access panels securely in place?  
3 - Check room thermostat for proper setting.  
4 - Replace any blown fuses or reset circuit breakers.  
5 - Gas valve should be ON.  
Check and clean blower wheel for any debris. Blower  
motor is prelubricated for extended bearing life. No  
further lubrication is needed.  
6 - Air filter should not be plugged limiting air flow.  
7 - Is gas turned on at meter?  
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.  
8 - Is manual main shutĆoff valve open?  
To keep your Lennox gas heating system in peak operatĆ  
ing condition year after year, contact your independent  
Lennox dealer about a planned service program.  
Page 5  
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Safety Precautions  
Planned Service  
If you discover any of the following, shut down your  
unit, and contact an independent Lennox dealer for  
an inspection by a qualified technician.  
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.  
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.  
Burners- Must be inspected for rust, dirt, or signs of waĆ  
ter.  
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.  
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.  
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.  
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.  
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.  
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.  
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 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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