Steam Pressure Cutout Question

Hal

Assuming steam has reached all the radiators, and all the air vents are subsequently closed, should not the steam pressure increase enough to trigger the cutout switch even if the thermostat's call is not met?

It seems to me that once all the radiators are filled, the boiler should shut off until radiation and condensation creates space for more steam, thereby continuing to heat until the thermostat is satisfied.

Dale

Dynamic

You are correct in that there are 2 ways besides the lwco to shut off the burner. And if the stat is in a cold space in relation to the majority of the house and the house space near the rads is too warm the rads won't condense fast enough and the boiler will go off on pressure. However the connecting pipes are constantly and dynamically condensing steam and so are the rads so the steam keeps coming since it's always turning to water in the rads and pipes. This is why you don't want to have too low a differential and why the location of the stat is important.

Hal

Dale, thanks. Your reply adds to my understanding.