HE – AOL series is ideal for climates where there is no chance for freezing of water.
Recirculation freeze protection can be provided by recirculation feature in the controller. An open loop water system provides many advantages. It is the simplest and typically the least expensive active system to install. There is no heat exchanger which allows transfer of heat directly to the water. The system operates at standard line pressure. It is simple to add capacity to the system as demand changes. The system integrates easily to the existing system.

• The collector (18) will switch on the pump when the temperature at the collector sensor TC is higher than the return temperature TR by at least the pre selected (delta T) amount.

• The pump circulates the hot water from collector to the tank.

• With the pump running if delta T is not met the pump will switch odd.

• When a present tank temperature is reached T Max the controller switches off the pump.

• The check valve (non return valve) prevents heat from the tank rising towards the collectors should the tank be warmer ( at night).