December 16, 2019

G50UH-48B-090 Furnace Page 2006 Lennox Industries USA RETAIN THESE

G50UH-48B-090 Furnace Page 2006 Lennox Industries USA RETAIN THESE - page 1

Page 1

03/06

*2P0306*

505,181M

*P505181M*

©

2006 Lennox Industries Inc.

Dallas, Texas, USA

RETAIN THESE INSTRUCTIONS 

FOR FUTURE REFERENCE

INSTALLATION

INSTRUCTIONS

G40UH(X) Series

GAS FURNACE

505,181M

03/2006

Supersedes 505,011M

Table of Contents

Unit Dimensions

2

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

G40UH(X) Parts Arrangement

3

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

G40UH(X) Gas Furnace

4

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

Shipping and Packing List

4

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

Safety Information

4

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

General

5

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

Combustion, Dilution & Ventilation Air

5

. . . . . . . . . . . . . . 

Setting Equipment

8

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

Filters

12

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

Duct System

12

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

Venting

12

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

Gas Piping

20

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

Electrical

21

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

Unit Start−Up

25

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

Gas Pressure Adjustment

26

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

High Altitude Information

27

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

Other Unit Adjustments

27

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

Service

28

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

Repair Parts List

30

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

Ignition Control Board Diagnostic Codes

31

. . . . . . . . . . . 

Troubleshooting

32

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

Start−Up & Performance Check List

35

. . . . . . . . . . . . . . . 

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 ap-

pliance.

Installation and service must be

performed by a qualified installer,

service agency or the gas supplier.

D

Do not try to light any appliance.

D

Do not touch any electrical switch; do not

use any phone in your building.

D

Immediately call your gas supplier from a

neighbor’s phone. Follow the gas supplier’s

instructions.

D

If you cannot reach your gas supplier, call

the fire department.

FIRE OR EXPLOSION HAZARD.

Failure to follow safety warnings exact-

ly could result in serious injury, death,

or property damage.

WARNING

D

Leave the building immediately.

Litho U.S.A.




Page 1 03/06 *2P0306* 505,181M *P505181M* © 2006 Lennox Industries Inc. Dallas, Texas, USA RETAIN THESE INSTRUCTIONS  FOR FUTURE REFERENCE INSTALLATION INSTRUCTIONS G40UH(X) Series GAS FURNACE 505,181M 03/2006 Supersedes 505,011M Table of Contents Unit Dimensions 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  G40UH(X) Parts Arrangement 3 . . . . . . . . . . . . . . . . . . . . .  G40UH(X) Gas Furnace 4 . . . . . . . . . . . . . . . . . . . . . . . . . .  Shipping and Packing List 4 . . . . . . . . . . . . . . . . . . . . . . . .  Safety Information 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  General 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Combustion, Dilution & Ventilation Air 5 . .

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