Table Of Contents - A.O. Smith HIGH EFFICIENCY ATMOSPHERIC VENTGAS WATER HEATER Use & Care Manual

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

TABLE OF CONTENTS

2