Lennox International Inc Furnace G71MPP User Manual

E 2008 Lennox Industries Inc.  
Dallas, Texas, USA  
505,335M  
03/2009  
G71MPP  
SERIES  
Supersedes 03/2008  
VARIABLE  
CAPACITY  
GAS FURNACE  
Litho U.S.A.  
WARNING  
FIRE OR EXPLOSION HAZARD.  
Failure to follow safety warnings exact-  
ly could result in serious injury, death,  
or property damage.  
WHAT TO DO IF YOU SMELL GAS:  
Do not store or use gasoline or other  
flammable vapors and liquids in the  
vicinity of this or any other appliance.  
D Do not try to light any appliance.  
D Do not touch any electrical switch; do not  
use any phone in your building.  
D Leave the building immediately.  
D Immediately call your gas supplier from a  
neighbor’s phone. Follow the gas supplier’s  
instructions.  
Installation and service must be per-  
formed by a qualified installer, ser-  
vice agency or the gas supplier.  
D If you cannot reach your gas supplier, call  
the fire department.  
03/09  
505,335M  
*P505335M*  
*2P0309*  
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installed. Take care to maintain established clear-  
ances surrounding the furnace.  
CAUTION  
4 − DO NOT store chlorine or fluorine products near unit  
or introduce these products into the combustion air.  
These products can cause furnace corrosion.  
Do not set thermostat below 60°F (16°C) in heating  
mode. Setting thermostat below 60°F (16°C) reduces  
the number of heating cycles. Damage to the unit  
may occur that is not covered by the warranty.  
5 − DO NOT draw return air from a room where this fur-  
nace, or any other gas appliance (ie., a water heat-  
er), is installed. When return air is drawn from a room,  
a negative pressure is created in the room. If a gas ap-  
pliance 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.  
WARNING  
If overheating occurs or if gas supply fails to shut off,  
shut off the manual gas valve to the furnace before  
shutting off electrical supply.  
WARNING  
Do not use this furnace if any part has been underwa-  
ter. A flood−damaged furnace is extremely danger-  
ous. Attempts to use the furnace can result in fire or  
explosion. Immediately call a licensed professional  
service technician (or equivalent) to inspect the fur-  
nace and to replace all gas controls, control system  
parts, and electrical parts that have been wet or to re-  
place the furnace, if deemed necessary.  
WARNING  
The blower door must be securely in place when the  
blower and burners are operating. Gas fumes, which  
could contain carbon monoxide, can be drawn into  
the living space resulting in personal injury or death.  
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 pressure  
and gas flow rate, adequate combustion, air, and proper  
venting.  
NOTICE  
Any additions, changes, or conversions required in  
order for the appliance to satisfactorily meet the ap-  
plication needs must be made by a licensed profes-  
sional installer (or equivalent) using factory−speci-  
fied and approved parts.  
WARNING  
Carbon monoxide gas is invisible, odorless and tox-  
ic.  
Exposure to carbon monoxide gas can cause personal in-  
jury 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 fire-  
places) has the potential to produce carbon monoxide gas.  
Because 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 available  
at reasonable retail prices. Contact your Lennox dealer for  
more details about this investment in your safety.  
WARNING  
Improper installation, adjustment, alteration, service  
or maintenance can cause property damage, person-  
al injury or loss of life. Installation and service must  
be performed by a licensed professional installer (or  
equivalent), a service agency, or the gas supplier.  
Safety Instructions  
1 − Keep the furnace area clear and free of combustible  
material, gasoline, and other flammable vapors and  
liquids. If it is installed in an insulated area, the furnace  
must be kept free of insulating material. Insulating ma-  
terial may be combustible.  
Your furnace is designed to meet standards set by national  
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 oper-  
ating environment. It is your responsibility to ensure that  
this appliance is maintained.  
2 − After any heavy snow, ice or frozen fog event, the fur-  
nace vent pipes may become restricted. Always check  
the vent system and remove any snow or ice that may  
be obstructing the plastic intake or exhaust pipes.  
Proper maintenance is critical for your safety and the satis-  
factory operation of the product. Lennox strongly recom-  
mends annual inspection and maintenance of this ap-  
pliance. Contact your Lennox dealer for an inspection by a  
licensed professional service technician.  
3 − DO NOT obstruct air flow to unit. Unit must receive an  
unobstructed flow of combustion and ventilating air.  
DO NOT block or obstruct air openings on the furnace  
or air openings to the area in which the furnace is  
Page 3  
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VARIABLE CAPACITY GAS VALVE  
DANGER  
Danger of explosion.  
There are circumstances in which odorant used with  
LP/propane gas can lose its scent. In case of a leak,  
LP/propane gas will settle close to the floor and may  
be difficult to smell. An LP/propane leak detector  
should be installed in all LP applications.  
Do not attempt to bleed the gas lines of air. Call your  
local gas provider.  
Start−Up & Operation Information  
GAS VALVE  
SWITCH  
WARNING  
GAS VALVE SHOWN IN OFF POSITION  
If you do not follow these instructions exactly, a fire  
or explosion may result causing property damage,  
personal injury or death.  
FIGURE 2  
8 − Move gas valve switch to ON position. See figure 2.  
9 − Replace the upper access panel.  
BEFORE PLACING THE UNIT INTO OPERATION, 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.  
10 − Turn on all electrical power to to the 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.  
The gas valve on the G71MPP is equipped with a gas con-  
trol switch. Use only your hand to move the control switch.  
Never use tools. If the switch will not move by hand, do not  
try to repair it. Call a licensed professional service techni-  
cian (or equivalent). Force or attempted repair may result in  
a fire or explosion.  
12− If the appliance will not operate, follow the section  
ꢀTurning Off Gas to the Unit" and call your service tech-  
nician or gas supplier.  
Turning Off Gas to the Unit  
1 − Set the thermostat to the lowest setting.  
Placing the G71MPP furnace into operation:  
®
2 − Turn off all electrical power to the unit if service is to be  
performed.  
G71MPP units are equipped with a SureLight ignition sys-  
tem. Do not attempt to manually light burners on this fur-  
nace. Each time the thermostat calls for heat, the burners  
will automatically light. The ignitor does not get hot when  
3 − Remove the upper access panel.  
4 − Move the gas valve switch to the OFF position.  
5 − Replace the upper access panel.  
®
there is no call for heat on units with SureLight ignition  
system.  
Filters  
All G71MPP filters are installed external to the unit. Filters  
should be inspected monthly. Clean or replace the filters  
when necessary to ensure proper furnace operation. Re-  
placement filters must be rated for high velocity airflow.  
1 − STOP! Read the safety information at the beginning of  
this section.  
2 − Set the thermostat to the lowest setting.  
3 − Turn off all electrical power to the unit.  
A filter must be in place and when the unit is operating. The  
filter access panel must also be in place and properly se-  
cured during unit operation.  
4 − This furnace is equipped with an ignition device which  
automatically lights the burners. Do not try to light the  
burners by hand.  
5 − Remove the upper access panel.  
TABLE 1  
6 − Move the gas valve switch to the OFF position. See fig-  
Filter Size  
Furnace  
Cabinet Width  
Side Return  
Bottom Return  
16 X 25 X 1 (1)  
20 X 25 X 1 (1)  
24 X 25 X 1 (1)  
7 − Wait five 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 instruc-  
tions. If you do not smell gas go to next step.  
17−1/2"  
21"  
16 X 25 X 1 (1)  
16 X 25 X 1 (1)  
16 X 25 X 1 (2)  
24−1/2"  
Page 4  
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Inspect the condensate drain and trap for leaks and cracks.  
The drain and trap must also be cleaned and the trap must  
be filled with water.  
Maintenance  
A licensed professional service technician (or equivalent)  
should inspect the complete system each season (heating  
and cooling). The following maintenance procedures  
should only be conducted by a licensed professional ser-  
vice technician (or equivalent). Do not attempt to service  
the unit in any way.  
During a seasonal check the service technician will con-  
duct a combustion analysis. The technician will also in-  
spect the indoor blower, burner flames, electrical connec-  
tions and the venting system.  
Blower  
Check the blower wheel for debris and clean if necessary.  
The blower motors are prelubricated for extended bearing  
life. No further lubrication is needed.  
WARNING  
ELECTRICAL SHOCK, FIRE,  
OR EXPLOSION HAZARD.  
Failure to follow safety warnings exactly could result  
in dangerous operation, serious injury, death or  
property damage.  
Improper servicing could result in dangerous opera-  
tion, serious injury, death, or property damage.  
Before servicing, disconnect all electrical power to  
furnace.  
When servicing controls, label all wires prior to dis-  
connecting. Take care to reconnect wires correctly.  
Verify proper operation after servicing.  
WARNING  
The blower access panel must be securely in place  
when the blower and burners are operating. Gas  
fumes, which could contain carbon monoxide, can  
be drawn into living space resulting in personal inju-  
ry or death.  
Burner Flame  
Venting System  
CAUTION  
To ensure proper operation, a licensed professional  
service technician (or equivalent) should check the  
burner flame and conduct a combustion analysis  
annually.  
WARNING  
Asphyxiation Hazard  
The exhaust vent for this furnace must be leak−free  
and must be securely connected to the furnace flue  
collar at all times.  
Electrical  
1 − Check all wiring for loose connections.  
2 − Check for the correct voltage at the furnace (furnace  
operating).  
For your safety and to fulfill the terms of the limited  
warranty, a licensed professional service technician  
(or equivalent) must annually inspect this furnace  
and its vent system.  
3 − Check amp−draw on the blower motor.  
Motor Nameplate__________Actual__________  
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.  
Service Reminder  
Call your Lennox service technician if the unit will not oper-  
ate. Before calling, always check the following to be sure  
service is required:  
Inspect the furnace for obvious signs of deterioration.  
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.  
Inspect the furnace venting system to make sure it is in  
place, physically sound, and without holes, corrosion, or  
blockage.  
Vent pipe must be clear and free of obstructions and must  
slope upward away from the furnace.  
5 − Air filter should not be plugged, which will limit air flow.  
6 − Is gas turned on at meter?  
Inspect the furnace return air duct connection to ensure  
duct is sealed to the furnace and terminates outside the  
space containing the furnace.  
7 − Is manual main shut−off valve open?  
Record the model and serial number of the furnace. These  
numbers are on the unit nameplate, which is located on the  
blower deck below the combustion air inducer.  
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.  
Serial Number __________________  
Model Number __________________  
Page 5  
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ing items during an annual inspection. Power to the unit  
must be shut off for the service technician’s safety.  
Safety Precautions  
If you discover any of the following, shut down your  
unit, and contact a Lennox dealer for an inspection by  
a licensed professional service technician (or equiva-  
lent).  
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.  
D 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 unfa-  
miliar noises.  
Burners − Must be inspected for rust, dirt, or signs of water.  
Vent pipe − Must be inspected for signs of water, damaged  
or sagging pipe, or disconnected joints.  
D If you smell any unusual odors, your unit may be operat-  
ing improperly. For example, units can give off unfamil-  
iar odors if components are required to operate in ab-  
normal conditions.  
Unit appearance − Must be inspected for rust, dirt, signs  
of water, burnt or damaged wires, or components.  
Blower access door − Must be properly in place and pro-  
vide a seal between the return air and the room where the  
furnace is installed.  
D Look for visible signs of a malfunctioning unit. Examples  
include unusual amounts of condensate on windows in-  
side your house, visibly burnt components or unusual  
dirt or rust accumulations on the vent pipe or in the unit.  
Return air duct − Must be properly attached and provide  
D If you experience headache, nausea, fatigue, or dizzi-  
ness, the cause could be exposure to carbon monoxide  
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.  
an air seal to the 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  
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 licensed professional service  
technician (or equivalent) as an investment in your well be-  
ing.  
compared to the unit specifications.  
Problems detected during the inspection may make it nec-  
essary 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 unsafe  
operation.  
Planned Service  
You should expect a service technician to check the follow-  
Repair Parts List  
The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model  
number listed on the CSA International nameplate −− Example: G71MPP−36B−070−1. All service must be done by a li-  
censed professional installer (or equivalent), a service agency, or the gas supplier.  
Cabinet Parts  
Upper access panel  
Heating Parts  
Flame Sensor  
Blower access panel  
Top Cap  
Heat exchanger assembly  
Gas manifold  
Combustion air inducer  
Gas valve  
Control Panel Parts  
Transformer  
®
Main burner cluster  
Main burner orifices  
Pressure switches  
Ignitor  
SureLight integrated control  
Door interlock switch  
Circuit Breaker  
Blower Parts  
Primary limit control  
Secondary limit  
Blower wheel  
Motor  
Flame rollout switches  
Backup secondary limit  
H−fitting assembly  
Blower housing cut−off plate  
Page 6  
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