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Posted by Heatpro on December 09, 2005 at 14:20:15:
In Reply to: glass water level gauge posted by dan on December 09, 2005 at 13:37:21:
Both the top and bottom valves have to be cleared of debris to let it work properly. An old coal boiler might also have three brass valves lined up along the side at the level of the gauge glass to open slightly to see if no water comes out the top, water comes out the bottom and some drips come from the middle one to let you know if there is water in the boiler to that level - they are called 'try cocks.'
The low water cutoff should cut off the burner if the water gets too low, so make sure that is functioning properly.
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