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what is it??

keith_20
keith_20 Member Posts: 11
in THE MAIN WALL
seen this on the basement wall of a customers home on friday! is this a type of outdoor reset?

Comments

  • Steamhead (in transit)
    Steamhead (in transit) Member Posts: 6,688
    I think so

    where do those capillary tubes go? If it's reset, one will go to an outdoor sensor and the other to a pipe or radiator.

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  • JK_4
    JK_4 Member Posts: 35


    It looks like a tempeture reset but not need be out door reset. some small apt. buildings use these as remote thermostats usually wirid in with timers.

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  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,601
    It's

    a reset control. Here are the specs:
    Retired and loving it.
  • Unknown
    Unknown
    Yup,,,,,,,,,,,,,,,,,,

    that`s an old Minneapolis-Honeywell reset contol, and you guy`s thought this was new "stuff", generally you set this to a "stoker".
  • keith_20
    keith_20 Member Posts: 11


    thanks guys! it looked like some sort of a reset control. will take a closer look next trip there.
  • Bob Vennerbeck
    Bob Vennerbeck Member Posts: 105
    capillary 'liquid' in old reset control

    It's a treat to see the old spec sheets - I especially like the warning about locating sensors where they can't be molested by children....
    But now I'm curious - just what IS the "hydraulic (all-liquid) fill" in the capsule and capillary? Might it be mercury?

    Vbob
  • Perry_2
    Perry_2 Member Posts: 381
    Probably.. and correct on the \"Stoker\" comment above

    You are probably correct in your guess of mercury as the capilary fill agent. It might be alcohol based - but given the age most likely mercury.

    The comment above on how these were often used on coal stokers is also correct. Probably about 1/2 of the home coal furnaces and stokers I helped service as a kid had them connected in a circuit with a timer for the stoker (the stoker would run a minimum amount periodially to keep the fire going- by the timer, and then the outdoor reset control could call for more running time for the stoker based on outdoor temperature).

    Perry
  • keith_20
    keith_20 Member Posts: 11


    yes this house is 1920-30 era. a old gas conversion burner is there now but i would say it was a coal stoker at the time. customer would like to upgrade next spring.
This discussion has been closed.

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