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Minneapolis-Honeywell

Alan (California Radiant) Forbes
Member Posts: 4,360
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
Two btu per sq ft for degree difference for a slab
4
Comments
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love that gauge too! Thanks for the trip down memory lane.Bob "hot rod" Rohr
trainer for Caleffi NA
Living the hydronic dream0 -
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 slab0 -
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 length0
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