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Water fill level Burnham steam boiler
New to homeownership, new to steam heating.
I have a two pipe system with Burnham PIN5SNC-MEZ boiler. I have no idea what the max fill level on this is.
The sight glass was about half full when we moved in, but someone told me we needed to monitor the water level, so in prep for winter I topped it off to about an inch below the top of the glass. Recently, I've had a lot of banging that sounds different and more rapid than thermal pipe expansion (I thought maybe steam/water hammer or something) soon after it trips on after having been off for a few hours. It seems to calm down after the system warms up. since there is steam in the system at this point, I imagine the water level has dropped a bit too so i wonder if I've overfilled it.
Any idea what max fill is on this?
New owner of a 1920s home with steam heat north of Boston.
Just trying to learn what I can do myself and what I just shouldn't touch