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I have an old model K type vapor system, the building is 120 Ft x 50 Ft and 12 floors including the basement. We have installed orifices in approximately 250 radiators that had their valves changed from original. I have lowered the pressure to between 1/4 - 1 1/2 pounds( am waiting for vapor stat). I know originally the main vents were all in the boiler room, there are now some vents outside the boiler room on the supplys and the returns. Just wondering if the main steam supplys or the main dry returns should be vented or not? also what would the ideal pressure be for this system? I have replaced all 3 crossover traps in this system.
Any help would be appreciated.