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Corroded LWCO

Bill Campbell
Bill Campbell Member Posts: 3
in THE MAIN WALL
We replaced an older oil fired boiler w/ WM GV-3 onto a copper baseboard system. The main in the basement is black pipe, mono-flo set up. We installed a hydrolevel 1100 LWCO in the return riser. Two weeks after install, there was water dripping from the electronics of the LWCO. After removal, the probe had a lot of "crud" build up, which I rubbed off. The probe is pitted with many tiny holes. Electrolysis at it's finest. Why? What's happening in this system? What should we be looking at?

Comments

  • Constantin
    Constantin Member Posts: 3,796
    Could it be stray voltage?

    Is the piping system in the home being used as a ground somewhere upstream from the LWCO? Stray currents don't have to be strong to do a real number on components. I'd try two things:

    1) Look "downstream" for grounds and attach them to the incoming copper water pipe, or better yet, to a dedicated ground rod outside.

    2) Electrically jumper the replacement LWCO. If the LWCO still fails in the future, you can discount the stray current theory. A bare ground wire attached to the pipe above and below the LWCO should do the trick.
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