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Lochinvar Knight - 0-10v control termination

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Domark68
Domark68 Posts: 8
in Gas Heating

Gotta think someone else came across this, Lochinvar Knight KHB155 comes with a separate Grundfos ECM circulator for the boiler primary loop and can be controlled by a 0-10v output.

My problem, the modular plug low voltage cable for the pump has three conductors (blue, black and brown), the control board on the boiler only has two terminals listed 0-10v +/- (see photo), which 2 of the 3 conductors are utilized? Nothing mentioned in the operator or service manuals, no instruction with the control cable either. Anyone?

IMG_6264.jpeg

Comments

  • 109A_5
    109A_5 Posts: 4,735

    You would have to look at the install manual for that circulator model. Since you did not provide us with the circulator model this is all I got.

    image.png
    National - U.S. Gas Boiler 45+ Years Old
    Steam 300 SQ. FT. - EDR 347
    One Pipe System
    Alan (California Radiant) Forbes
  • Domark68
    Domark68 Posts: 8

    109A_5

    Thanks much for the diagram, that says it all. Brown would be + and Blue -, can’t believe no illustrations with either pump or cable. Apple the quick reply.

    Alan (California Radiant) Forbes
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Posts: 4,893

    Brown +

    Blue -

    8.33 lbs./gal. x 60 min./hr. x 20°ΔT = 10,000 BTU's/hour

    Two btu per sq ft for degree difference for a slab
  • Domark68
    Domark68 Posts: 8
    edited November 6

    appreciate! Damn spellcheck!

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