A.O. Smith FVIR - Table of Contents

2
TABLE OF CONTENTS
Water Heater Safety .......................................................................................................................................................................... 1 -2
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 ......................................................................................................................................................... 6-7
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
LP Gas Only ........................................................................................................................................................................... 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 ..................................................................................................................................................................... 15-17
Piping Installation .............................................................................................................................................................. 15-16
Closed System/Thermal Expansion ....................................................................................................................................... 16
Temperature & Pressure Relief Valve .................................................................................................................................... 17
T&P Relief Valve and Pipe Installation .................................................................................................................................. 17
Important Information About this Water Heater ..............................................................................................................................18
Operating Your Water Heater ....................................................................................................................................................... 19-21
Lighting Instructions ............................................................................................................................................................... 19
Checking the Draft ................................................................................................................................................................. 20
Burner Flames ....................................................................................................................................................................... 20
Emergency Shutdown ............................................................................................................................................................ 20
Water Temperature Regulation ......................................................................................................................................... 20-21
Water Temperature Adjustment ............................................................................................................................................. 21
Operating Modes and Settings .............................................................................................................................................. 21
Electrical Connections/Wiring Diagram ................................................................................................................................. 22
Operational Conditions ..................................................................................................................................................... 23-24
Draining and Flushing ............................................................................................................................................................ 24
Routine Preventive Maintenance ........................................................................................................................................... 24
Temperature and Pressure Relief Valve ................................................................................................................................ 25
Maintenance of Your Water Heater .............................................................................................................................................. 25-29
Replacement Parts ................................................................................................................................................................ 25
Removing the Burner Manifold/Burner Assembly .................................................................................................................. 25
Removing the Burner from the Manifold/Burner Assembly ................................................................................................... 26
Replacing the Pilot/Igniter - Flame Sense Assembly ............................................................................................................. 26
External Inspection & Cleaning of the Base-Ring Filter ........................................................................................................ 27
Cleaning the Combustion Chamber and Flame-arrestor ....................................................................................................... 27
Replacing the Manifold Burner/Assembly ......................................................................................................................... 27-28
Igniter System ........................................................................................................................................................................ 28
Testing the Igniter System ..................................................................................................................................................... 28
Removing and Replacing the Gas Control Valve/Thermostat .......................................................................................... 28-29
FVIR System Operational Checklist ...................................................................................................................................... 29
Troubleshooting Checklist ........................................................................................................................................................... 29-30
Status Light Troubleshooting Flowchart .................................................................................................................................... 31-32
Sequence of Operation Chart ........................................................................................................................................................... 33
Repair Parts Illustration ................................................................................................................................................................ 34-35
Notes .... .......................................................................................................................................................................................... 36-38
Warranty .......................................................................................................................................................................................... 39-40