Help - identify these water lines

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Super917

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Hello, I was hoping for some help identifying some water lines that are connected in with the cold line going into my water heater. There are 3 lines that I've been unable to identify. I've tried turning off the 1/4 turn valve in the upper right of the photo and my external spigots and all internal fixtures continue to work. If I shut off the yellow ball valve the water turns off to the cold side to my water heater which is expected.

What are the 3 lines in the upper half of the photo? Any help would be appreciated! Thanks
 

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Super917

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Thanks for the quick response Mark! I appreciate it and makes sense as I have 3 Furnace units.
 
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