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Posted by Mike Sherman on January 27, 2005 at 14:02:25:
I have a 59 year old steam boiler system. The actuating control on top of the boiler includes a mercury switch that activates the burner when the thermostat calls for heat.The mercury switch's attitude is controlled by two mechanical springs that place position the switch in response to pressure from boiler coming through a pigtail. I think the pigtail is clogged because the springs, even when adjusted to the limits of adjustment are not moving the mercury switch into the "make" position. It's cold here, so I've temporarily propped up the assembly to position the mercury switch into the "make" position until I can get a service tech in to look at it. Should I worry about the safety of this makeshift? Is removing and cleaning the pigtail simple and should I try it myself orleave to a tech? I think it's time to replace the old system but need to stay warm for now.
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