Table Of Contents - A.O. Smith DIRECT VENTED GAS MODELS Installation And Operating Manual

SAFE INSTALLATION, USE AND SERVICE . . . . . . . . . . . 3
GENERAL SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Qualifi ed Installer Or Service Agency . . . . . . . . . . . . 6
Preparing For The Installation . . . . . . . . . . . . . . . . . . 6
INSTALLATION REQUIREMENTS FOR THE
COMMONWEALTH OF MASSACHUSETTS . . . . . . . . . . . 7
TYPICAL INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . 9
Get To Know Your Water Heater - Gas Models
(List Referencing Figures 1-5). . . . . . . . . . . . . . . . . . 9
Replacement Parts And Deliming Products . . . . . . 10
Combo Heating Inlet And Outlet Side Taps . . . . . . . 10
High Limit Controls (Energy Cut Off). . . . . . . . . . . . 10
Thermostat/Water Temperature
LOCATING THE NEW WATER HEATER . . . . . . . . . . . . . 11
Facts To Consider About The Location . . . . . . . . . . .11
External/Internal Damage . . . . . . . . . . . . . . . . . . . . .11
Air Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Confi ned Space Installations. . . . . . . . . . . . . . . . . . 12
Clearances To Combustibles
Floors With Carpeting
Clearance For Servicing
Chemical Vapor Corrosion . . . . . . . . . . . . . . . . . . . 12
Storage Of Flammable Liquids . . . . . . . . . . . . . . . . 13
Insulation Blankets . . . . . . . . . . . . . . . . . . . . . . . . . 13
Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Water Pressure
Mixing Valves
INSTALLING THE NEW WATER HEATER . . . . . . . . . . . 15
Water Piping Installation . . . . . . . . . . . . . . . . . . . . . 15
Closed Water Systems . . . . . . . . . . . . . . . . . . . . . . 15
Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . . 15
Temperature-Pressure Relief Valve. . . . . . . . . . . . . 16
T&P Valve Discharge Pipe Requirements:
Temperature-Pressure Relief Valve And
Pipe Insulation
Filling The Water Heater . . . . . . . . . . . . . . . . . . . . . 17
Space Heating And Potable Water Systems . . . . . . 18
Combo Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
System Requirements
Installation
Gas Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Sediment Trap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
High Altitude Installations . . . . . . . . . . . . . . . . . . . . 21
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Vent Terminal Clearances . . . . . . . . . . . . . . . . . . . . 22
DV Termination Safety Cover . . . . . . . . . . . . . . . . . 23
Vent Connections . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Locating Clearance Hole For Vent . . . . . . . . . . . . . 23
Standard Vent Arrangement . . . . . . . . . . . . . . . . . . 23
Vent Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Securing Vent Termination Assembly To
The Exterior Wall. . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Vent Restricter Plate . . . . . . . . . . . . . . . . . . . . . . . . 24
Uncompressing The Corrugated Tubing . . . . . . . . . 24
Vent Connection To The Water Heater . . . . . . . . . . 25
Offset Vent Arrangement . . . . . . . . . . . . . . . . . . . . . 25
Installation Checklist . . . . . . . . . . . . . . . . . . . . . . . . 27
2

TABLE OF CONTENTS

LIGHTING INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . 28
TEMPERATURE REGULATION . . . . . . . . . . . . . . . . . . . 29
FOR YOUR INFORMATION. . . . . . . . . . . . . . . . . . . . . . . 30
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
LEAKAGE CHECKPOINTS . . . . . . . . . . . . . . . . . . . . . . . 39
REFERENCE PARTS LISTING . . . . . . . . . . . . . . . . . . . . 40
TROUBLESHOOTING GUIDELINES. . . . . . . . . . . . . . . . 42
NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
www. hotwater .com
Temperature Regulation . . . . . . . . . . . . . . . . . . . . . 29
Temperature Adjustment
Operating The Temperature Control System. . . . . . 29
Water Temperature Adjustment
Operating Modes And Settings
External Damage . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Start Up Conditions . . . . . . . . . . . . . . . . . . . . . . . . . 30
Condensate
Smoke/Odor
Thermal Expansion . . . . . . . . . . . . . . . . . . . . . . . . . 30
Strange Sounds . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Operational Conditions . . . . . . . . . . . . . . . . . . . . . . 31
Smelly Water
"Air" In Hot Water Faucets
High Water Temperature Shut Off System
Housekeeping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Flood Damage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Venting System Inspection . . . . . . . . . . . . . . . . . . . 32
Pilot And Main Burner . . . . . . . . . . . . . . . . . . . . . . . 32
Burner Flames. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Servicing The Water Heater . . . . . . . . . . . . . . . . . . 33
Removing And Replacing The Gas Control Valve/
Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Removing The Gas Control Valve/Thermostat:
Replacing The Gas Control Valve/Thermostat:
Removing The Manifold/Burner Assembly . . . . . . . 33
Removing The Burner From The Manifold/Burner
Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Natural Gas (Low Nox) & Propane (LP) Gas Burner
Replacing The Pilot/Thermopile Assembly . . . . . . . 34
Replacing The Manifold/Burner Assembly . . . . . . . 35
Piezoelectric Igniter System . . . . . . . . . . . . . . . . . . 36
Testing The Igniter System . . . . . . . . . . . . . . . . . . . 36
Temperature-Pressure Relief Valve Test . . . . . . . . . 36
Draining, Refi lling And Flushing . . . . . . . . . . . . . . . 36
To Drain The Water Heater Storage Tank
To Refi ll The Water Heater Storage Tank
To Flush The Water Heater Storage Tank
Drain Valve Washer Replacement . . . . . . . . . . . . . 37
Anode Rod Maintenance. . . . . . . . . . . . . . . . . . . . . 37
To Remove The Anode Rod:
To Install The Anode Rod:
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39