If you are familiar with Numatic air valves, maybe you've seen this before. I purchased 3 Numatic 353 valve with 120V coils. When you open the terminal box to make the connections, there are three wires: red, white, and lack. The terminal strip is marked +12 and +14 on the red and black. Any ideas why?

I double checked the part number and it is a 120V coil. Looking for an quick explanation.