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eg 45 weil mclain boiler

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eg 45 weil mclain boiler  - what is a proper voltage between Y & G terminal? 

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  • HVACNUT
    HVACNUT Member Posts: 5,857
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    Can you post a pic of the wiring diagram?
  • ChrisJ
    ChrisJ Member Posts: 15,767
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    eg 45 weil mclain boiler  - what is a proper voltage between Y & G terminal? 


    Going 100% by memory here,
    But I think that's the connections across the thermostat? If so I'd expect it should be zero when the thermostat is calling for heat and 24V+- when it's not.

    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • realliveplumber
    realliveplumber Member Posts: 354
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    Looks like y and g are at the vent damper
  • realliveplumber
    realliveplumber Member Posts: 354
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  • ChrisJ
    ChrisJ Member Posts: 15,767
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    I guess it depends on the age of the boiler.

    I just went down and took this picture of the diagram on my 2011 EG series.



    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment
  • polish_flash2000
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    Thank you for all help.