Tech ST-21 Solar automation for solar collectors

ST-21 SOLAR controller for solar panels (collectors).
The controller controls the main pump (collector) based on changes in temperature in the inlet manifold and in the storage tank (DHW).
The ST-21 solar controller is equipped with a system to prevent the pump from sticking during long periods of inactivity; every 10 days the pump is activated for 1 minute.
This automation system is equipped with an additional freeze protection feature. When the temperature sensor or tank drops below 6°C, the pump will turn on and run continuously until the temperature rises above 7°C.

Functions performed by the ST-21 SOLAR controller:
pump control;
solar system management;
anti-stop function;
protection against overheating and freezing of the collector.
ST-21 SOLAR regulator equipment:
LED display;
manifold temperature sensor;
two temperature sensors.

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Country of origin: Poland