Table Of Contents - A.O. Smith HW 300 Installation & Operation Manual

SAFE INSTALLATION, USE AND SERVICE.......................................................................................................................................................................... 2
GENERAL SAFETY................................................................................................................................................................................................................ 3
TABLE OF CONTENTS .......................................................................................................................................................................................................... 4
DIMENSIONS AND CAPACITY DATA .................................................................................................................................................................................... 5
INTRODUCTION .................................................................................................................................................................................................................... 7
Grounding Instructions ................................................................................................................................................................................................... 7
Correct Gas .................................................................................................................................................................................................................... 7
Precautions .................................................................................................................................................................................................................... 7
Liquid Petroleum Gas Models ........................................................................................................................................................................................ 7
High Altitude Installations ............................................................................................................................................................................................... 7
CONTROLS AND FUNCTION ................................................................................................................................................................................................ 8
High Limit ....................................................................................................................................................................................................................... 8
Intermittent Ignition Control Module ............................................................................................................................................................................... 8
Thermal Balancer ........................................................................................................................................................................................................... 9
Auto Reset High Limit Control ........................................................................................................................................................................................ 9
Safety Flow Switch ......................................................................................................................................................................................................... 9
Safety Relief Valves...................................................................................................................................................................................................... 10
Tank Temperature Control .............................................................................................................................................................................................11
Thermometers (not installed) ....................................................................................................................................................................................... 12
DRAIN VALVE ...................................................................................................................................................................................................................... 12
GENERAL ............................................................................................................................................................................................................................ 12
Required Ability ............................................................................................................................................................................................................ 12
Location ........................................................................................................................................................................................................................ 12
Air Requirements .......................................................................................................................................................................................................... 13
Chemical Vapor Corrosion............................................................................................................................................................................................ 13
Installation Clearances ................................................................................................................................................................................................. 14
Leveling ........................................................................................................................................................................................................................ 14
System Connections .................................................................................................................................................................................................... 14
VENTING ............................................................................................................................................................................................................................. 14
Venting the Boiler ......................................................................................................................................................................................................... 14
Venting Maintenance .................................................................................................................................................................................................... 16
Venting Sidewall ........................................................................................................................................................................................................... 16
Venting System ............................................................................................................................................................................................................ 16
Venting Tables .............................................................................................................................................................................................................. 17
SYSTEM INSTALLATIONS .................................................................................................................................................................................................. 18
Installations .................................................................................................................................................................................................................. 18
Conventional ........................................................................................................................................................................................................ 18
Linear Temp .......................................................................................................................................................................................................... 18
Water Supply Line ................................................................................................................................................................................................ 19
Expansion Tank .................................................................................................................................................................................................... 19
Vent Valves ........................................................................................................................................................................................................... 20
Manifold Headers ................................................................................................................................................................................................. 20
Cooling Piping ...................................................................................................................................................................................................... 20
Circulating Pump .................................................................................................................................................................................................. 20
Gas Connections .......................................................................................................................................................................................................... 20
Gas Supply Line Purging and Sizing ............................................................................................................................................................................ 21
Gas Pressure Regulators ............................................................................................................................................................................................. 22
WIRING ................................................................................................................................................................................................................................ 23
WIRING DIAGRAMS ....................................................................................................................................................................................................... 24-33
PIPING ............................................................................................................................................................................................................................ 34-39
OPERATION AND START-UP INSTRUCTIONS .................................................................................................................................................................. 39
Important ...................................................................................................................................................................................................................... 39
Filling the System ......................................................................................................................................................................................................... 39
Pilot Alignment and Main Burner .......................................................................................................................................................................................... 39
Lighting Instructions ................................................................................................................................................................................................ 43-44
Checking and Adjusting Input ....................................................................................................................................................................................... 41
Operating Sequence .................................................................................................................................................................................................... 42
REMOVAL OF EXISTING BOILER FROM A COMMON VENTING SYSTEM ..................................................................................................................... 45
GENERAL MAINTENANCE ................................................................................................................................................................................................. 45
Cleaning and Flushing Instructions ...................................................................................................................................................................................... 46
PRE TROUBLESHOOTING ................................................................................................................................................................................................. 46
TROUBLESHOOTING .................................................................................................................................................................................................... 47-54
LIMITED WARRANTY .......................................................................................................................................................................................................... 55

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