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MM #42 vs a #67

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Tim Schram_2
Tim Schram_2 Member Posts: 17
in Strictly Steam
Just curious,



Is there any reason I couldn't use a #67 LWCO to replace a #42?  The 67 has contacts to control feeding a water feeder too.  Just curious.  There is a boiler feed pump on the system for making up water.



Tim

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  • Steamhead
    Steamhead Member Posts: 16,876
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    The #67 should not be used for a boiler-feed pump

    Pumped-return requires the switches to activate every time the boiler needs water. The #67's switches aren't up to that job. They're fine for the occasional water feed on a gravity-return system, but that's it.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
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