Operation manual of solar controller SR1568
Page 65 of 87
Note: The adjustable collector over-temperature value OTST is blocked against the
collector emergency temperature CEM by 10 K. This function will only be available
when the collector cooling function and the system cooling function are deactivated.
Depending on the selected system, heat transfer function can be triggered only when the
output is available.
HEATX (Heat exchange between tanks)
The heat exchange function can be used for transferring heat from a heat source to a heat
sink.
The relay (system-dependent) is energized when all switch-on conditions are fulfilled:
• The temperature difference between the sensors heat source and heat sink has
exceeded the switch-on temperature difference.
• The temperature at the heat source sensor has exceeded its minimum temperature
• The temperature at the heat sink sensor has fallen below its maximum temperature
When the set temperature difference is exceeded, pump speed control starts. For every
decrease or increase by the rise value, the pump speed will be adjusted by 10%.
RPH（Return preheating）
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