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4 Nov 2000 at 2:24 pm
#288605
fourth year
Participant
There should be Flo-control valve on the pipe out of the boiler to prevent that problem. It is usually red but could be some other color. If it is there, it has a lever on the top that can be rotated clockwise to lift the gate and allow gravity circulation. Screwing it counterclockwise restores it to a forced system.