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Found another steam system yesterday. There aren’t many left, and when I find them, they are of course piped wrong. I was charging an AC system (needs to be replaced, leaks pretty bad) and talking to the homeowner while i patently waited for pressures to equalize to check superheat on the cobbled up monstrosity of a system (tiny liquid line, mismatched AHU and condenser, long line set.), owner tell me “the last company that charge this unit and services my boiler wasn’t sure if it was steam or hot water.” Palm slap to head. How on earthier do they service something if they don’t know what it is? I walk up to hte first radiator I see... yup, ... 1 pipe steam. House was built in 1907, same time as mine, same brick, similar features and layout, probably same architect. It’s parallel flow but the header splits into two directions. Didn’t have time to see all all was wrong but I don’t recall seeing any main vents. Had a sort of a equalizer at least. Had a Dunkirk with single side outlet on a boiler that people needs two, so bet it’s noisy sometimes.
I’ll follow up in the Fall and offer to take over annual service and make a list of what needs correction. LWCO and Autofeed I don’t think work. I’m sure the pressure is set too high. I warned him of adding water if it’s hot and below the sight glass.
Saving steam one system at a time when you find them.