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Loud pop before the damper kicks in (steam boiler)
I just had a new Burnham Independence IN5I 140,000 (KIN-5) steam boiler installed. It has been running for 6 weeks. Before the damper kicks in and the the boiler fires up, there is a loud pop. It sounds like a bit like a balloon popping and is immediately followed by the squeaking of the damper. It doesn't happen every time the boiler fires up. It happens maybe a third of the time.
The installer came back to take a look but it unfortunately didn't make the sound while they were here. My guests sleep in the room next to the boiler and it is loud enough to wake them up so I can't have guests sleep there anymore. Any idea what this is and how to stop it? Thanks.