December 15, 2019

G71P Furnace Page 50650901 2011 Lennox Industries USA DOWNFLOW

G71P Furnace Page 50650901 2011 Lennox Industries USA DOWNFLOW - page 1

Page 1

04/11

*2P0411*

506509−01

*P506509-01*

 2011 Lennox Industries Inc.

Dallas, Texas, USA

DOWNFLOW

HORIZONTAL RIGHT

HORIZONTAL LEFT

UPFLOW

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), service agency or the gas supplier.

INSTALLATION

INSTRUCTIONS

G71MPP

DAVE LENNOX SIGNATURE

®

COLLECTION GAS FURNACE

MULT−POSITION VARIABLE CAPACITY

506509−01

04/2011

Supersedes 07/2010

THIS MANUAL MUST BE LEFT WITH THE

HOMEOWNER FOR FUTURE REFERENCE

This a safety alert symbol and should never be ignored.

When you see this symbol on labels or in manuals, be alert

to the potential for personal injury or death.

CAUTION

As with any mechanical equipment, personal injury

can result from contact with sharp sheet metal

edges. Be careful when you handle this equipment.

NOTICE

A thermostat is not included and must be ordered

separately.

The Lennox icomfort Touch thermostat must be

used in communicating applications.

In non−communicating applications, the Lennox

ComfortSense

®

 7000 thermostat may be used, as

well as other non−communicating thermostats.

In all cases, setup is critical to ensure proper sys-

tem operation.

Field wiring for both communicating and non−com-

municating applications is illustrated in diagrams,

which begin on Page 32.

Table of Contents

Unit Dimensions

2

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

G71MPP Parts Arrangement

3

. . . . . . . . . . . . . . . . . . . . . . . . . 

Shipping and Packing List

4

. . . . . . . . . . . . . . . . . . . . . . . . . . . 

Safety Information

4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Use of Furnace as Construction Heater

5

. . . . . . . . . . . . . . . . 

General

6

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Installation − Setting Equipment

6

. . . . . . . . . . . . . . . . . . . . . . . 

Filters

12

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Duct System

13

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Pipe & Fittings Specifications

13

. . . . . . . . . . . . . . . . . . . . . . . . 

Vent Pipe Sizing Worksheet

15

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Vent Piping Guidelines

16

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Joint Cementing Procedure

17

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Venting Practices

18

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Gas Piping

28

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Electrical

30

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Integrated Control

38

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Blower Motor Performance

45

. . . . . . . . . . . . . . . . . . . . . . . . . . 

Unit Start−Up

56

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Gas Pressure Measurement

57

. . . . . . . . . . . . . . . . . . . . . . . . . 

High Altitude Information

59

. . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Other Unit Adjustments

60

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Heating Sequence of Operation

61

. . . . . . . . . . . . . . . . . . . . . . 

Service

62

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Integrated Control Diagnostic Codes

65

. . . . . . . . . . . . . . . . . . 

Configuring Unit Size Codes

68

. . . . . . . . . . . . . . . . . . . . . . . . . 

Troubleshooting

69

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Repair Parts List

75

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

Start−Up & Performance Check List

75

. . . . . . . . . . . . . . . . . . . 

Litho U.S.A.




Page 1 04/11 *2P0411* 506509−01 *P506509-01*  2011 Lennox Industries Inc. Dallas, Texas, USA DOWNFLOW HORIZONTAL RIGHT HORIZONTAL LEFT UPFLOW 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), service agency or the gas supplier. INSTALLATION INSTRUCTIONS G71MPP DAVE LENNOX SIGNATURE ® COLLECTION GAS FURNACE MULT−POSITION VARIABLE CAPACITY 506509−01 04/2011 Supersedes 07/2010 THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE This a safety alert symbol and should never be ignored. When you see this symbol on labels or in manuals, be alert to the potential for personal injury

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