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Differential Controller?

Unknown
Unknown Member
in THE MAIN WALL
Check here...

http://www.mepcollc.com/VV.htm#mepco2

Noel

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  • Bende Bessko
    Bende Bessko Member Posts: 9
    Differential Controller

    I found a Differential Controller in an old apartment building that has a 2 pipe steam system. This controller is not in-line any more and I don't know what it used to do. It's connected to the supply side and the return side. It also has a bunch of electrical components. It's pretty old. It's made by Dunham, not Dunham-Bush.

    Does anyone know what it used to do?
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