SYSTEMS

· forced circulation · natural circulation · once trough · solar plants ·

The hook-up is valid both for outdoor and for indoor all over the year active swimming pools. Up to a surface of 90 m² is possible with a single sunnyday solar panels battery.

The solar panels must be fed by a pump different from that used for the filtering plant since flows, pressures and operative times are different each other.

The Sc and Sp sensors check the water temperature respectively at the Bs solar panels battery outlet and in the Cm delivery manifold where the swimming pool water continuously flow by means of the Pf filtering plant pump. If the collectors are hottest than the swimming pool water, the differential thermostat activates the Ps solar plant pump.

Whenever the Ps solar plant pump stops, down from the panels while air will enter trough the Sa air discharge valve; in such a way the panels are automatically protected form the frost. For this reason the panels must be installed with a sufficient slope (almost 20°). If, on the contrary, the slope does not assure the drainage, at the end of the season the panels must be filled with a brine of water and sodium chloride that prevents the freezing up to - 20°C. In areas in which the frost is rare, also a forced circulation of water in the panels, when the panels temperature drops down to +4°C, can be used.

The delivery head of the Ps solar plant pump must be sufficient both for the pressure drops of the circuit and to rise the water from the swimming pool level up to the upper part of the Bs solar panels battery and, then to slightly pressurise the plant to avoid any suction of air from the Sa air discharge valve when the Ps solar plant pump is in action; this over pressure is to be regulate at the first testing of the plant by means of the Vr regulating valve.

It could be necessary, if the pressure drops down-stream the Cr return manifold are high, to provide a Vnr check valve to prevent that water coming form the filtering plant rise and stagnate in the solar plant with the danger of frost in winter season.