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LWCO troubleshooting

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jim_14
jim_14 Member Posts: 271
in THE MAIN WALL
<strong>I have McDonnel Miller series 67 manual LWCO. Its about 7 years old, and while i didnt religously blow it down every 2 weeks, i have done it at least once a month since it was installed.



Last year I noticed when I tested it while my steam boiler was running, it did not shut down. I suspect it might be the float.

Is there a way to fix this? (force water up the discharge pipe?)

I was also thinking of checking the electrical connection thats made directly to this unit with a digital VOM. What voltage reading should I get?

Any help/suggestions greatly appreciated</strong>

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  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,576
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    renewing the lwco

    if the lwco is not shutting off the burner, when the valve is opened; then the most likely cause would be a stuck float.

    the lwco needs to be taken apart, inspected, and perhaps rebuilt, using a kit available from the manufacturer. fortunately, for perhaps the most important part of your system, it is a simply mechanism.--nbc
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