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Trying to determine type of system I'm working on.
Radiators are two pipe, steam pipe comes in high, return line exits low with no steam trap.
Some radiators have air vents, some don't.
I have #75 Hoffman air vents on condensate return lines near boiler, also have bucket traps on same condensate lines.
What do I need to do to correct it?
I have always seen two pipe systems with traps at radiator with no air vents (on radiator) and one pipe systems using air vents on the radiator.