Is there a direction of hydraulic connection to respect on an installation of DualSun SPRING panels?

YES, and it is mandatory to respect it as it can have some non negligeable impact on the panel thermal performances.

To follow the natural direction of the fluid flow from the inter-panel connections to the heat exchanger manifolds, and thus limit the pressure losses in the manifold, it is essential to respect the direction of connection of the panel lines.

Viewed from the front, a line of panels in portrait orientation should systematically have its cold fluid inlet on the bottom left and its hot fluid outlet on the top right. This ensures that the bottom of the panel is filled while maintaining the inertia of the fluid.

Viewed from the front, a line of panel in landscape orientation should systematically have its cold fluid inlet on the bottom right and its hot fluid outlet on the top left. This ensures that the bottom of the panel is filled while maintaining the inertia of the fluid.

In order not to make a mistake, you just have to make sure that the cap at the end of the hydraulic line are well under the panels and therefore not visible.