I just bled my radiators, and after I bled them, the boiler pressure was about 10psi, so I added a bit of water to the system to get it up to 15psi.
Since then, the pressure has gone up to 30psi and activated the release valve. A number of times I have opened the bleed valve on a radiator and let out water until the pressure decreased back to 15psi, but the boiler pressure keeps going back up to 30 and releasing hot water. What do I need to do get the system to stay at optimal pressure? Note that we haven't had the heat on consistantly: it has been off much of the time I have been monkeying with the system.
You might not have a problem. If the boiler water is cool at 15 lbs and comes up to temperature, the expansion can take the same water up to 30 lbs. If you maintain a heated temperature and it rises then it is usually your pressure reducing valve. These can be adjusted and do have to be replaced on occasion.
Check the expansion tank. More than likely it is waterlogged. Water expands when heated, the tank compensates for this with an air cushion. When it's full of water theres no room for expansion and the boiler pressureizes quickly. C.
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