Operation manual of solar controller SR1568
Page 64 of 87
Heat transfer by variant pump:
If the collector temperature or tank temperature reaches the adjusted switch-on temperature,
the allocated relay for pump is energized with 100 %; if the collector temperature falls by 5 K
below the adjusted collector over-temperature, the relay will be switched off. In the variant
pump, the heat transfer function works independent from solar loading.
Heat transfer by variant valve:
If the collector temperature reaches the adjusted collector over-temperature, the allocated
relay will be energized 100% in parallel to the solar pump. If the collector temperature falls by
5K below the adjusted collector over-temperature, the relay will be switched off.
Heat transfer function can be used to release excess heat either from collector or from tank,
(HDSEN Col= transfer collector’s excess heat, HDSEN Load= transfer the excess heat from
tank)
Below is the example of this application for reference.
Collector Valve logic heat transfer Collector pump logic heat transfer
Tank valve heat transfer Tank pump heat transfer
Icon displays on the screen, it means heat transfer function is activated.
Icon displays on the screen, it means heat transfer function is in operation.
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