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ALL radiator vents hissing/spitting, building over heating
New install, ran well for a few weeks, but last night building is OVER heating and ALL radiator vents are hissing for entire cycle (never closing). No hissing at the end of main vents, though. Most rad vents are Hoffman no. 40’s, (6psi operating pressure). Honeywell Pressuretrol cut in was set to 2 with internal diff set to 1 added (watching the 30 psi gauge it actually read 2 cut in, 6 out. Honeywell pressuretrols not very accurate?). Is this a classic case of “dirty” water? I did not have time to test cleanliness of water but the upper portion of glass gauge did look dry. Water level in glass gauge was very stable.
this was all the information I was able to gather for the time I had here. I plan to return tomorrow, any suggestions as to what the problem is or what to look for would be much appreciated.
also, I turned down Honeywell control to 1/2 psi cut in with 1 diff (which came out to be 1 cut in and 5 out on gauge). I turned down thermostat. No more over heat calls but ALL radiators still hiss/spit for the entire cycle, only quieting when I shut off boiler and gauge hit zero.
If it is dirty water, could the building overheat? And, at the same time not get the 180 degrees to close air vents?
If the boiler was overpressured at some point (above ten psi) would ALL radiator vents fail?
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