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Two pipe trane steam system that is short cycling
I have an oil fired Peerless TW-5 steam boiler that keeps short cycling after the steam reaches the convector units. The vaporstat with a mercury switch keeps shutting off the boiler and restarting it. I originally had it set at 9oz Main and 5oz Diff. The system would run for about 45 seconds then shut off for about 25 seconds and constantly repeat until eventually the thermostat was satisfied. I changed my vaporstat settings to 12oz Main and 8oz Diff as I read on a past wall post for proper Steam settings. Now the system runs for about 2 minutes & 15 seconds then off for about 40 seconds. I was told that the short cycling is probably because the boiler is oversized. Any thoughts. I'm in Yonkers, NY.