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Noisy risers and radiators
Recently installed a Weil McClain 880 boiler in a 15 unit 5 story coop apartment building with approximately 50 radiators. Originally had water hammer at piping next to the boiler and a constant feed of fresh water in the boiler during the cycling resulting in a extremely high water level. We flushed the boiler numerous times over the next two weeks to clean out the system and the technician increased the psi cutoff from 2.5 to 5 psi. After those actions the hammer stopped and water level stablized. We are currently experiencing loud pinging sounds from a few risers during the start and end of the heat cycle and the sound of dripping within the risers after the heating cycle. The dripping sounds like water hitting a hardwood floor. No leak has been detected, which makes me believe it is within the riser. The air valves on many radiators hiss loudly on both the start and end of the heating cycle, the start sounding more wet and the end sounding dry. The building is very warm and some tenants don't open their radiators at all, especially on the top floor, the building historically has always been warm. We plan on changing all the air valves and try to balance the system, but prior to that I hope to be able to understand the current situation better. I'd also like to reduce the psi cutoff back down to 2.5 psi if possible. It currently reaches about 4.5 psi during the heating cycle. In addition the system lacks steam traps. Any insights?