267 The Drain-Back solar system How is it working? J Starting the pump station engages the filling of the primary network and ensures the energy transfer from the solar collectors to the thermal store. J Whenever the pump station stops working, the water contained in the collectors goes down back to the thermal store J The air intake allowing the draining is ensured by an orifice always placed out of water (at atmospheric pressure) J Thanks to this unique way of working, no safety devices, safety valves, expansion vessels, anti-return valve or glycol are necessary Advantages J 0 % glycol: the liquid carrying the heat is only the water inside the system J Self-working system with the pump station modulations depending the temperatures inside the collectors and the thermal store J Automatic management of the defrost mode and avoidance of overheating mode J No commissioning on the solar system, no replacement of the heat-carrying liquid The pressurised solar system How is it working? J The heat-carrying liquid is mixed with glycol to avoid freezing in the solar collectors system J Whenever the solar collectors reach an useful temperature level, the system provides a continuous supply of energy J The energy from the collectors is returned to the thermal store thanks to the coil Advantages Monovalent J The solar system is used as first heating source and can be coupled with a wall mounted boiler. The cold water is first pre-heated in the thermal store and the boiler can provide additional heat instantaneously if needed Bivalent J The solar system integrates a backup heater. The domestic hot water is directly produced in the thermal store. The additional heater ensures the back-up in case of low sunshine ON ON
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