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Anyone know what this control is?

KCA_2 Member Posts: 308
edited March 2016 in Thermostats and Controls
It's working on an 80 or so year old hot water boiler..........

24V ..... likely a relay but?????? Lol

It actually has tubes, like the old TV's. Did..... comes with a cover for the tubes, likely so they don't get hit......

I've looked on line and find that it's called an outdoor reset control, but no pictures and the ones that do post a picture, are wrong...... not the same control..... non-the-less, it could be a 1954 outdoor reset..... one of the first... lol

:-)) KCA
:-) Ken