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Just removed about 10 gallons of water from my 6 gal capacity boiler!
Trying to figure this one out.. Last weekend, saturday, I decided to do some maintenance on one my 1 pipe gas steam boiler (Burnham IN4)
Water level at the beginning was normal (1/2 to 3/4) full on the glass gauge...
Pressure gauge has not been working..Remove gauge ,try to clean out the 1/4" piping with pipe cleaner (the little flex ones you get in the dollar stores) Cant reach the pigtail, deal it with later..
Also LWCO was not shutting boiler off when opened (manual MM 67) Have a valve on the little plug opening on the bottom, stick pipe cleaner up there, knock some gunk out and water starts to flow out nicely..
Drain the return pipe via a valve at the drain level (floor level), only ran it for a minute or so, pretty clean water coming out.. Also I have another drain valve at the lowest tapping level on the boiler where the hartford loop ends I believe.. Opened that up and let some out..
Ok..So I vac arount boiler, etc... Now I am ready to test and see if the pressure gauge is working.. Start her up to let her build pressure ..tested the LWCO during this time and it worked when blowing it down..cut power off as it should.. I let the boiler run until steam hit the rads... Pressure gauge still showed 0.. Oh well have to replace it I guess.. another day
Then I noticed the water level in the sight glass is at the bottom...I was kind of perplexed... I dont think I took that much water out... So I let the boiler cool for about 90 mins and I added fresh water to bring it up to halfway or a little more on the glass.. Ran it again to boil the fresh water and that was it.
I do not have an automatic feeder! Only ran the boiler a few times since saturday since the weather has been nice
Sunday evening I look and I see the water is at the top of the sight glass.. I let about 3 gallons out.. Monday night water is above sight glass! I let about 3 more gallons out... Last night (tuesday) same thing - high water level again... So again I let almost 3 gallons out.
This morning.. its high again... So another 1 gallon bucket gets let out
So what happened here????
I am guessing a vacuum was created on saturday during my clean out procedures?? Sucking the water out back into the return lines??? Never had this happen before and never had any issue with the water level prior to this.. I do have hot water baseboard off this boiler if that makes a difference..and that system has been used more the last few days then my calls for steam..
Anyone have a good explanation????