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Posted by HeatPro on November 09, 2007 at 11:19:16:
In Reply to: LIMIT SWITCH posted by pete on November 09, 2007 at 09:52:56:
A high limit switch does what it is named, it limits water temperature to the temperature it is set at. It might not do that exactly at the set temperature, as it depends on where it is located to sense water temperature.
There are other limits, like a low limit that keeps the temperature at that setting which is often used to keep the boiler warm to make hot water, and a circulator limit which lets the circulator run at that set temperature.
Honeywell owns the name Aquastat; White Rodgers and others can't use that name to describe a water limit switch.