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The boiler is model number PEG112CDE and is supplying steam to the radiators.
So, if the knobs are supposed to be both closed, how is the sight glass supposed to indicate the water level in the boiler? (top and bottom - as pictured here):
Right now, I have no idea how much water is in there because the water in the sight glass doesn't move and I don't want to overfill it.
Hello again, virtually all steam boilers ever built have an automatic water feed float system so that when the water gets a few inches low the water feed valve opens and fills the boiler to about half a glass.. From your reports that is how you boiler is operating.When you want to read the sight glass turn both knobs on the sight glass 1/4 turn open and read the glass, then open the boiler *drain valve slightly* and you will see water in the drain where the drain valve goes.You will see the water level in the sight glass drop, proving it works, then close the drain valve, and you will see the sight glass fill up again, proving the city water feed works... you should do that test every 30 days. 60 days between tests maximum.After you do the test turn the knobs on the sight glass to the right.. that closes the valves and the sight glass will not read again until you open them for another test.The sight glass is fragile, that is why it is left closed between tests.
The sight glass is ONLY an indicator it does not control the water level. The water level is monitored by a float valve. The checks mentioned above are to insure the float valve works... and that the switch it is connected to that kills power to gas valve stops the burner if the water in the boiler gets low.Let me know if that makes any sense or not on your end, we keep going until you have full and complete answer you need, and understand it, there are no time limits here.Phil
Let me make sure I understand properly and have the correct procedure down for when I need to do this.
Right now, the red light on my low water cut off is off, so I don't need to do anything.
every 30 - 60 days, I should open the knobs a quarter turn, drain a little water to see if the level in the glass goes down. I'd imagine that I should turn off the heat and let the boiler cool before doing this.
Otherwise, when the light goes on, after letting the boiler cool (I know that cold water+hot boiler = bad ), I should turn both knobs about a 1/4 turn open. that will show me the water level. Then, use the water feed into the boiler to fill it and when the sight glass is at an acceptable level, stop the water, close the knobs on the sight glass and turn the heat back on.
Is that correct, or am I missing a step.
Thank you for your patients, I just don't want to do something to mess up a very expensive part of my home.
Thank you, that was very clear.