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Minneapolis-Honeywell

Alan (California Radiant) Forbes
Alan (California Radiant) Forbes Member Posts: 4,214
in THE MAIN WALL
mixing valve installed in 1950 and still going strong. Serving copper tubing in the floor downstairs and copper tubing in the ceiling plaster upstairs.





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
billtwocaseSolid_Fuel_ManTinmankcopp

Comments

  • hot_rod
    hot_rod Member Posts: 23,379
    love that gauge too! Thanks for the trip down memory lane.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Alan (California Radiant) Forbes
    Alan (California Radiant) Forbes Member Posts: 4,214
    After digging around the controls a little bit more, I came to find out that the boiler is controlled by a Honeywell aquastat below the eaves on the east side of the house. The original boiler was probably something with a high water content like one made by American Radiator Co., but it has since been replaced with a Munchkin. The Munchkin complains when the aquastat turns on the boiler, but the thermostat hasn't turned on the circulator. I'm tempted to make it a constant circulation system.

    This is the oldest outdoor reset system I've ever seen. Those engineers at Honeywell were mighty smart.
    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
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 16,470
    If it's the one I am thinking of they were pretty common. Looked like an aquastat had two bulbs 1 outside air 1 in the boiler. Problem always the capillary length

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