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aquastat on steam return set to maintain boiler temp ?

sherpa Member Posts: 2
i could not see any evidence of domestic hot water ever being connected. this system looks original.


  • sherpa
    sherpa Member Posts: 2
    why maintain boiler temp based on steam return?

    short cycling steam boiler (old snow man).
    found an la409 aquastat from minniapolis honeywell(petro mizer) maintaining boiler temp based on a steam return line below the water line. why? is this for comfort? it can't be fuel efficent.
  • It might be

    or might've been connected to a heat timer . Or that was the only place to get an aquastat in the water ?
  • Brad White_202
    Brad White_202 Member Posts: 105
    I agree or

    it could also be a high limit for a HW zone or domestic HW production.

    If for a Heat Timer as Ron suggested, that is to sense the completion of a cycle, a full warming of the system. If the 'stat is on the return side of the Hartford Loop (if there is one, I hope so...) then I suspect the Heat Timer.

    If on the boiler side, I would think it is a high limit to keep the boiler from steaming when making DHW.
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