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Excessive water in sight-glass of Peerless Series 63/64 steam boiler
Hi! Happy Thanksgiving to all of you on this frigid day in NYC (21F outside now). All plumbing stores are closed so I desperately seek advice on this holiday to fix a problem before my 2010-old boiler busts.
I noticed my sight-glass is full and its not dirty (crystal clear water). To lower the sight-glass water level, I turned off the boiler and then drained the water from the boiler and red-rusty water came out until the boiler was mostly drained. But, that sight-glass level remained as is--the water level remained unchanged! When I turned on the boiler, the low-level water feeder's yellow light indicator (low-water level) turned on, and then its green light (water-feeder in operation) turned on as it started automatically to intake more water into the boiler, and then the water feeder turned off after 5 minutes (all of this suggests the low-level water feeder functions properly--not sure of this though). The pressuretrol gauge indicates 50 PSI and this has been consistent throughout (even when I pressed it to re-set the gauge and even when the boiler was drained) so I am not sure this is relevant to the puzzle. A prior post (from some research on this site) indicated that the "one cause of excess water can be excess pressure forcing water out of the boiler into the returns, and activating the water-feeder" (nicholas bonham-carter, 2012). Please advise so that I can lower my water level in the sight-glass to the normal level. FYI: my plumber was too busy this season to perform a basic maintenance on my boiler this year.