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Instead of a thermocouple, it is used in some standing-pilot gas furnaces. A thermopile senses the heat from a pilot-light flame. It is larger than a thermocouple. It operates both the main gas valve and the pilot light. If there is a thermopile present, there's no transformer required.

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1. Instead of a thermocouple, it is used in some standing-pilot gas furnaces. A thermopile senses the heat from a pilot-light flame. It is larger than a thermocouple. It operates both the main gas valve and the pilot light. If there is a thermopile present, there's no transformer required.





 
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