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LEGEND HEATERS<br />
SERVICE WORKBOOK<br />
GAS PRESSURE REQUIREMENTS<br />
LEGEND HEATERS<br />
SERVICE WORKBOOK<br />
Product Update: Legend Boilers LB/LW-1000<br />
The field repair kit for Legend 1 MBH has been released. This kit is not only<br />
recommended for units experiencing hard starts, but is also recommended for units<br />
with periodic lock-out problems.<br />
Spacer Kit At Includes:<br />
• Burner Spacer Assembly<br />
• Revised Air Shutter<br />
• Blower Support Bracket<br />
• Gas Line Shim<br />
• Instructions<br />
After Burner Spacer Kit has been installed. The service agent needs to repeat the<br />
start-up procedures.<br />
• Blower pressure should be set between 4.5" and 5" w.c.<br />
• Gas manifold pressure should be set between 3" w.c. and 3.5" w.c.<br />
• CO 2 readings should be:<br />
8.0 to 9.5% for Natural Gas<br />
8.5 to 10.0% for Propane<br />
Ref: Operation information table on page 19.<br />
The supply gas pressure is measured at the tap indicated. This reading must be<br />
measured with ‘flowing’ gas.<br />
The manifold gas pressure is measured at the manifold pressure tap as indicated.<br />
A.O. <strong>Smith</strong> <strong>Water</strong> Products Co.<br />
Irving, Texas © 1997<br />
11<br />
Service Workbook<br />
Training Department<br />
A.O. <strong>Smith</strong> <strong>Water</strong> Products Co.<br />
Irving, Texas © 1997<br />
69<br />
Service Workbook<br />
Training Department
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