User manual A.O. Smith 101

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CONTENTS  
SAFE INSTALLATION, USE, AND SERVICE ....................................................................................................................................... 2  
GENERAL SAFETY ................................................................................................................................................................................ 3  
TABLE OF CONTENTS ......................................................................................................................................................................... 4  
Installation Requirements for the Commonwealth of Mass ................................................................................................................... 5  
Wiring Diagram....................................................................................................................................................................................6-7  
Schematic Diagram ................................................................................................................................................................................ 8  
Lighting and Operating Instructions....................................................................................................................................................... 9  
Water Temperature Regulation ............................................................................................................................................................ 10  
Control System ................................................................................................................................................................................ 10-11  
Operating Sequence............................................................................................................................................................................. 11  
UIM Operating Procedures .................................................................................................................................................................. 12  
Operating Setpoint Adjustment Procedure .......................................................................................................................................... 14  
TROUBLESHOOTING IGNITION SYSTEM ......................................................................................................................................... 16  
Troubleshooting Gas Valve.............................................................................................................................................................. 17  
PREVENTATIVE MAINTENANCE ........................................................................................................................................................ 17  
Main Burners.................................................................................................................................................................................... 17  
Relief Valve ...................................................................................................................................................................................... 18  
Combustion Air Filter ....................................................................................................................................................................... 18  
Blower Compartment........................................................................................................................................................................ 18  
Burner Maintenance ......................................................................................................................................................................... 18  
Condensate Removal System ......................................................................................................................................................... 18  
Venting Maintenance........................................................................................................................................................................ 19  
Heat Exchanger Preventive Maintenance ....................................................................................................................................... 19  
Tube Cleaning Procedure................................................................................................................................................................ 19  
REPLACEMENT PARTS ...................................................................................................................................................................... 19  
LIMITED WARRANTY .......................................................................................................................................................................... 23  
INTRODUCTION  
®
This design complies with the current edition of the ANSI AL 29-4C is a registered trademark of Allegheny Ludlum  
Z21.13 low-pressure boiler standard.  
Corporation.  
Compliance under this standard implies that when the boiler  
underwent test, the gas manifold and control assembly provided  
on the boiler met safe lighting and other performance criteria.  
In addition to these instructions, the boiler(s) shall be installed in  
accordance with those installation regulations in force in the local  
area where the installation is to be made. These shall be carefully  
followed in all cases. Authorities having jurisdiction should be  
consulted before installations are made.  
Detailed installation diagrams are found in this manual. These  
diagrams will serve to provide the installer a reference for the  
materials and methods of piping necessary. It is essential that  
all water, gas piping and wiring be installed as shown on the  
diagrams. You should thoroughly read and understand this  
manual before installation and/or operation of this boiler.  
In the absence of local codes, the installation must comply with  
the current editions, as follows:  
In the United States:  
The factory warranty will be void if the boiler(s) have been The National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the  
improperly installed or operated. National Electric Code, NFPA 70.  
4

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