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 Thanks for the reply. If I am using the one at 25%  would it cause any damage if I used the one at 33 %? I believe that the 4' means 4 minutes 

Hi, I hope someone can help me understand the difference between to following transformer information. I have an old Oil Fired Rayburn and the ignition transformer has failed. I have sourced a new transformer, however, the one that has been sent to me by Rayburn has a different transformer code...