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

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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

Operating the Gas Valve (Figure 2)

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.

Table 1 lists recommended filter sizes.

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-

ure 2.

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 (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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