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I have a raypac RP2100 model # CR185MN ASME. I want to know how many millivolts are required to operate the gas valve ?

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Generally, it should operate properly at around 500mv. There are different gas valves that require anywhere from 250mv all the way up to 750mv. If you're in that range, the gas valve should work. If you have a weak thermopile, a replacement should do the trick. It's also good to clean all the contacts on the gas valve, pressure switch, and other components. Also make sure you have adequate gas pressure and a strong pilot.

Posted on Nov 20, 2009

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