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Posted by Mike on December 10, 2007 at 10:50:07:
I recently replaced my 60 year old steam boiler with a new Weld McLain SGO4 unit. The new boiler was sized the same as the old. The problem I have is the radiators get hot very fast and the air vents shut. After the air vents shut the pressure builds above .5lbs and then the pressuretrol shuts the boiler off. The pressuretrol is set to .5 cut in with a diff of 1. The pressure drops in 30 seconds and the boiler runs again for 30 seconds till the pressure goes above .5lbs again. The convection from the radiators to the air takes about 10 to 15 minutes to satisfy the thermostat so the system can cycle 7 to 8 times. This only happens in the morning when the temp swing is the greatest.
Does anybody make a product that monitors the radiator temps and can then bypass the thermostat after the radiators are hot? This would stop the cycling? All radiator air vents are new along with two new main air vents. The water is clean and the boiler level is very stable when boiling. The system runs smooth without any clanging.
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