I had a new boiler installed a few weeks back and the system bangs like crazy. It's keeping us up at night. It's a laars mini-therm. Set to 180 at 19psi. When cold no bangs up to 120. Once passing 120 it bangs from the unit and psi jumps. The system has been bled many times and it was a complete repipe. The system is setup as boiler - outflow - taco recirculator - low water shutoff - air scoop with new expansion - split to two zones. I notice there is no bypass as required by this unit I believe. Would that cause the issue? Other thought is my circulator should be on the inflow side. System is being ran closed from main.
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