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Skimming Burnham Boilier with no Skim Port
Bought a new (to me) house in June. Has a Burnham Independence boiler for a one pipe system that was replaced in 2016 and I have been unable to get it to settle down. I have read a lot of discussions to try and get the bouncing issue taken care of but wanted to ask about something in particular.
In short, it will fire, water level will bounce and trip the low water cutoff, heat is unlikely to make it to the extremities of the system. I had the company who installed the boiler come to inspect it and they said the previous owners never maintained the system and that the water was just dirty causing it to bounce. He heated up the boiler until it bounced and tripped the LWCO, opened the drain valve and drained out dirty water (didn't drain it dry, just a few gallons), refilled from the feed very slowly to mix the fresh water with the remaining hot water in the boiler, repeat until the bouncing settled and it ran as it should. Boiler will run alright for a few days or a week and then it starts this process all over again and bounces/trips. Their advice was to repeat this process until the crap gets flushed out of the system and it should be OK (as well as putting some anti-foaming agent in that they had), but other things I have read say introducing new water to the system repeatedly, even though boiled immediately, is unlikely good for the boiler itself.
When I drain the water into a clean bucket during this process it leaves a residue on the edges near where the surface of the water was sitting that streaks if you run your finger across it, brown in color, leading me to believe there's some sort of oil in there that needs to be skimmed. However, this boiler has no skim port that I can see.
Can I skim it out of the top sight glass port somehow? Do I remove the LWCO probe and skim it out that port? My gut feeling is that this boiler was installed new and never skimmed properly. I certainly don't want to damage this system by repeating the instructions I've been given indefinitely as surely it's never getting the contaminants that sit on the surface out of the system.
Any and all help would be appreciated since it's getting colder! I am mechanically inclined and after watching him clean/service the boiler am confident if there's a way to do this I will have no problem getting it done myself. The system itself seems pretty simple, but I find it odd there's no dedicated skim port, given how important that is if contaminants get into the system water.
Thanks in advance,