Pioneer BH250 water pump shutoff valves

my wife and I just bought a 2017 BH250. It was winterized when we bought it, so I'm a newbie already, and trying to figure out everything that needs to be un-winterized, turned back on, etc...
I found the water pump and water heater shutoff valves and turned them back open, but there are two valves by the water pump. Both were closed before so I opened both. That didn't seem quite right when the pump was running so I shut one off again. The one I shut off is a blue pipe connecting to one of the outside pipes, fill or flush, im not sure.
If I could figure out how to attach a picture here it would probably make more sense.
I'm just wondering if I have the combination of valves open and closed now? What is that second valve for?

Thank you