Turn the 2 blue lines closed, and the red open -- oposite of the position they are in now. Actually, if you're going to blow out the lines and not put antifreeze in the water lines, you can keep it the way it is. Make sure you take our the anode plug to drain any water out of the heater itself. I pop open the pressure relief falve just to make sure there's no pocket of water left in the heater.
Yep, they sure put the heater bypass in an inaccessible place, I have to take my drawers out to get to it. I'm going to antifreeze the whole kit and kaboodle -- Northeast Ohio winters get pretty cold.
Mark, Vicki, & Scout THE dog
2015 Hemisphere 282RK
2010 F250 Super Duty
1992 Goldwing Aspencade