Easy conversion from "Break on fall" vaporstats to "break on rise" ?
Seeing a number of the older mercury vaporstats on the 'bay that are "break on fall" with the contacts on the mercury tube on the left. Is there an easy way to make these break on rise? Maybe use the 'stat to power a relay coil?
Hopefully helpful pictures:
Comments
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The 408B break on fall was something of an anomaly. I don't think they sold all that well — which is probably why they keep showing up on eBay and so on.
Adding a relay is the obvious way to reverse the action, although it does require power — simple wire the coil through the vapourstat with a suitable power source, and use the normally closed contacts as your signal.
Br. Jamie, osb
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England1 -
Just take out the mercury bulb and reverse it. Just kidding, but maybe not really.
NJ Steam Homeowner.
Free NJ and remote steam advice: https://heatinghelp.com/find-a-contractor/detail/new-jersey-steam-help/
See my sight glass boiler videos: https://bit.ly/3sZW1el0 -
Doable, but not easy. Have to unglue it. @Jamie Hall 's idea is much easier.
Trying to squeeze the best out of a Weil-McLain JB-5 running a 1912 1 pipe system.0
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