Most gas fired appliances these days use flame rectification to prove the pilot flame before initiating the main burner. Flame rectification is the process that uses the flame to convert an AC signal to a DC current (micro amps). There is a specific way to test the signal strength, the right knowledge and the correct meter is needed. The meter will need to have a micro amp setting and it is suggested to use meter leads with alligator clips to make testing easier and safer. The video below explains in detail how to test a flame signal. In most cases, the flame signal will read 2-7 micro amps for residential and small commercial applications
FLAME RECTIFICATION – HOW TO CHECK A FLAME SIGNAL
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Gary McCreadie
Gary McCreadie is an HVAC tech, the creator of hvacknowitall.com, the HVAC Know It All Podcast, and owner of McCreadie HVAC & Refrigeration Services
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HVAC Know It All was created by Gary McCreadie, a licensed refrigeration and gas technician, with three goals in mind:
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