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Changing Grumman sunstream 332a SHW collector pipes
Hello everyone. What is a great site to stumble upon. Recently I bought some old but new Grumman sunstream 332a shw collectors and was just wondering if there is gonna be any unforeseen issues to change out the copper piping system inside the panels? Also what is the best way to get to them. It has screws on the top glass and rivets on the bottom.
I originally was gonna use these with a glycol system but now I want to make it a drainback system if possible. It has 3/4" copper headers but only 1/4" Nom risers which is the problem. I would like to make them 1/2" risers.
The collectors are from 1980 so there is not much info online about them however I did find the attachment found below with some specs.
That is all I need guys. I really appreciate everyone time and thanks for reading this.