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Was working in a house on a gas leak,homeowner asked me to look at his boiler.Gauge glass had no water but feeder would not feed.I took apart gauge glass,pressuretrol etc.Everything was clogged solid.I cleaned and filled boiler and now gauge glass shows water level.It's a Carrier steam boiler.The installers never left a valve to empty boiler water.On the bottom of boiler there is a 2 1/2 inch plug.?1 ..can i remove it and put a full port valve there to blow down boiler.
?2..the pressure gauge 0-25 is broke and stuck on 5psi.Most of the air vents on rads dont work.If I replace all air vents is it as easy as say put all D valves on top floor ,C valves on 3rd floor etc.In the foyer there is a 5column 28 section rad,what kind of airvent should that get.
House was built in 1890 so as you can imagine a lot of work has been done,thanks for your help.