I Am Installing A Drainback Solar Thermal System How Do I Facilitate Proper Drainback?

I am installing a drainback solar thermal system how do I facilitate proper drainback?

In order for your system to “drainback” when the pump shuts off your collectors and piping must be sloped at 1/4″ per 12″ of run.  Be aware that visually your collectors will not be parallel with your roof ridge.