Operation manual of solar controller SR1568
Page 55 of 87
Each system has pre-programmed options and adjustments which can be activated or
changed respectively if necessary. Select the system first (1-23 systems available)
LOAD (2)
DT Temperature difference
The controller works as a standard differential controller. If the temperature reaches or
exceeds the switch-on temperature difference, the pump switches on. When the temperature
difference reaches or falls below the adjusted switch-off temperature difference, the
respective relay switches off.
Note: The switch-on temperature difference must be 0.5 K higher than the switch-off
temperature difference. The set temperature difference must be at least 0.5 K higher
than the switch-on temperature difference.
Note: In systems with 2 tanks or tank loading in layers, 2 separate menus (LOAD and
LOAD 2) will be displayed.
Speed control
If the temperature reaches or exceeds the switch-on temperature difference, the pump
switches on at 100% speed for 10s. Then, the speed is reduced to the minimum pump speed
value.
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