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System Pressure During Boiler Cycling
Trying to get the controls working as efficiently as possible for the single pipe steam system on our 16 unit apartment building. The boiler is oversized, so cycling is inevitable (1,875 sq. ft. EDR for the convectors, 2,700 sq. ft. net EDR for the boiler). The pressure doesn't reach the high pressure limit until the system is uniformly hot, so I think everything is working correctly, but the oversized boiler is producing more steam than the convectors can condense.
I have the Pressuretrol set to cut in at 0.5 PSI and out at 1.5 PSI. At those settings, the system pressure drops all the way to 0 and the vents open each time the boiler cycles. The system calls for the burner to come on at 0.5 PSI as it should, but there's a delay between the call and the burner firing as the burner goes through its startup and purge. Should I adjust the cut in/cut out pressure up so that pressure is maintained throughout the cycle? I remember reading in Dan's book that allowing the vents to open during cycling might be a good thing, as it would allow any air trapped behind a vent that closed on pressure rather than temperature to escape, but I don't think that's an issue in this case.
I'd appreicate your thoughts!