The DualSun pool heating capability is designed to operate only during swimming season. While the DualSun panel is capable of lengthening this season by several weeks, during the winter and in countries with a risk of frost we recommend draining the solar installation to avoid damaging it. The drainage period will vary depending on the geographic location of your installation; check the mean climatic data for your region to avoid frost.
A drainage kit is included in the system for installations located in zones with a risk of frost. It contains:
- a solar aerator
- PVC fittings including a shut-off valve and a ¾” threaded end to install a hose onto the drain valve
Recommended drainage period:
- Drainage: end of October
- Filling: end of April
When draining, the solar system must be switched off at the solar control unit.
The solar aerator is a diaphragm valve specifically designed for this application, and allows air to enter the circuit at the onset of a slight internal negative pressure (5 mbar).
This occurs when the drain valve is open.
Gravity and the replacement of the water by air allow the installation to be completely emptied.
When putting the system back into operation, check the position of the valves and set the control unit to Auto.
Some installations may have the panels at a height close to that of the pool. When the discharge of the panels is below the level of the pool, it may be necessary to manually drain the installation. In this case we recommend adding a manual drain valve to the installation.