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Weil-McLain Steam boiler - hydronic loop stopped working

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axele
axele Member Posts: 2
We have a single pipe steam system. Works like a charm.

Unfortunately though the hydronic loop for our extension that is on a different thermostat
stopped working.
I can feel the pump starting when the thermostat is on 'heat'. But there is no warm water circulating
and the boiler does not seem to be on.
I feel the pump is running a bit hot. Like there is no water in it. But that might just be me projecting.

Entire system is about 4 years old.

Any pointers and / or suggestions would be much appreciated.





Comments

  • Jolly Bodger
    Jolly Bodger Member Posts: 209
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    What you have there is a wet rotor circulator. They can get seized up and it is hard to tell besides the water does not flow. The motor will still get hot.
  • Snowmelt
    Snowmelt Member Posts: 1,418
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    looked at the picture for 20 seconds and i can spot two things.
    one your don't need an expansion tank or air eliminator. If I went to look at it I would say looks like a rookie did it.
    you have air in the line you need to get the air out, did the installer leave some way to get the air out.
  • mattmia2
    mattmia2 Member Posts: 9,941
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    There is a PRV as well, so I'm thinking it is using a tankless coil as an HX.
  • KC_Jones
    KC_Jones Member Posts: 5,749
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    mattmia2 said:

    There is a PRV as well, so I'm thinking it is using a tankless coil as an HX.

    The tankless on that boiler would be located where that big round plate, so no tankless in this boiler.
    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
  • STEAM DOCTOR
    STEAM DOCTOR Member Posts: 2,040
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    > @KC_Jones said:
    > (Quote)
    > The tankless on that boiler would be located where that big round plate, so no tankless in this boiler.

    Tankless for that boiler is inside the jacket. Front left corner. On the left most section. Rectangular plate.
  • KC_Jones
    KC_Jones Member Posts: 5,749
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    Must have the provision for both on that one then, didn't realize they did that.


    2014 Weil Mclain EG-40
    EcoSteam ES-20 Advanced Boiler Control
    Boiler pictures updated 2/21/15
  • mattmia2
    mattmia2 Member Posts: 9,941
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    So then is that a tankless inside the jacket just below the service switch?
  • mattmia2
    mattmia2 Member Posts: 9,941
    edited December 2019
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    Can you take a picture of the piping behind the expansion tank? Is there a drain in that pipe that transitions from iron to copper?

    Where is that aquastat? Is it inside the front cover on the lower left?