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I'm replacing a Williams gas valve with a new Robertshaw. The Williams has a commection for a limit switch and the Robertshaw does not. Where do I connect the limit switch? Williams model P172100A Robertshaw model 710 millivolt series.
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Originally Posted by: DBM  I'm replacing a Williams gas valve with a new Robertshaw. The Williams has a commection for a limit switch and the Robertshaw does not. Where do I connect the limit switch? Williams model P172100A Robertshaw model 710 millivolt series. There are 4 screw connections-- T-stat 1 and 3 Generator 2 and 4 Limit switch 2 and 3 Does that that sound right? These notes taken from a Williams installation instruction.:)
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That magnet is needed in order to keep the gas flowing. But for safety reasons you need to shut it down if a fire occurs so what you do is place a fuse inline with that wire to the magnet. The valve will work great unless there is a fire in which the fuse melts, kills the magnet and thus the gas is shut down.:DClever ain't it?
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