Surely, someone here has actually seen a Taco flowcheck operate?
Trying to assess a very old radiant slab system for eventual update. Converted the house to scorched air and will never be happy with it, even if humidified.
I want to figure out if the existing taco flow checks are still working correctly. Is the pin at the top supposed to bob up and down with operation, or does it merely damper the motion of an internal, invisible part? The electricity has been disconnected so I can't just turn the circulators on. The modern ones have what looks like a thumbscrew, but mine just has something like a button that seems to have no threads or slots. They don't move with hand pressure and I'm worried if I take a wrench to them, a leak will spring. System is huge and must contain hundreds of gallons of water. I did install a new gauge about 10 years and the system is at the same pressure it was 5 years ago when I shut it off, so there are no leaks. Plumber who was afraid (his own admission) to take on the overhaul job 5 years ago told me to never let fresh air get into it.