A.O. Smith VB/VW- 750 User Manual

6

This design complies with the current edition of the ANSI 

Z21.13  low-pressure boiler standard.
Compliance under this standard implies that when the boiler 

underwent test, the gas manifold and control assembly pro vided 

on the boiler met safe lighting and other performance criteria.
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.
The factory warranty will be void  if  the  boiler(s)  have  been

improperly installed or operated.

AL 29-4C

®

 is a registered trademark of Allegheny Ludlum 

Corporation.
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.
In the absence of local codes, the installation must comply with  

the current editions, as follows:
In the United States:

The National Fuel Gas Code, ANSI Z223.1/NFPA 54 and the 

National Electric Code, NFPA 70.