TABLE OF CONTENTS

 

Water Heater Safety

1-4

Safe Installation, Use and Service

3

Safety Precautions

3-4

Typical Installation

5

Installing Your Gas Water Heater

6-8

Important Information About Your Water Heater

6

Consumer Information

6

Consumer Responsibilities

6

Unpacking the Water Heater

6

Location Requirements

7

Site Locations

7

Clearances and Accessibility

8

State of California

8

Gas Supply

9-10

Gas Requirements

9

Gas Piping

9

Gas Pressure

9

Gas Pressure Testing

9

Gas Pipe Capacity Table

10

Combustion Air and Ventilation

11-15

Unconfined Space

11

Confined Space

11

All Air from Inside the Building

12

All Air from Outdoors

12

Louvers and Grilles

12-13

Vent Pipe System

13

Draft Hood Installation

13-14

Vent Pipe Size

14

Vent Connectors

14

Chimney Connection

14

Vertical Exhaust Gas Vent

14-15

Water System Piping

15-18

Piping Installation

15-16

Closed System/Thermal Expansion

16

Temperature & Pressure Relief Valve

16-17

T&P Relief Valve and Pipe Installation

17

Combination Space Heating/Potable Water System

17-18

Solar Installation

18

Electrical Connections and Wiring Diagram

18

Important Information About this Water Heater

19

Operating Your Water Heater

20-25

Gas Valve/Thermostat - Lighting Instructions

20

Checking the Draft

21

Burner Flames

22

Emergency Shutdown

22

Water Temperature Regulation

22-23

Operational Conditions

23-24

Routine Preventive Maintenance

24

Temperature and Pressure Relief Valve

25

Maintenance of Your Water Heater

25-27

Replacement Parts

25

Removing the Burner from the Manifold/Burner Assembly

25

Replacing the Flame Sense/Hot Surface Igniter Assembly

26

External Inspection & Cleaning of the Air Intake Chamber Louvers

26

Cleaning the Combustion Chamber andAir Diverter Assembly

26

Replacing the Manifold Burner/Assembly

26-27

Removing and Replacing the Gas Control Valve/Thermostat

27

FVIR System Operational Checklist

28

Troubleshooting Chart

28-29

Control Display Troubleshooting

30-33

Repair Parts Illustration

34

Listed Parts Kits and Illustrations

35

Notes

36-38

Warranty

39-40

2

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A.O. Smith 315456-002, GAHH-40, GAHH-50 installation instructions Table of Contents