Operation manual of solar controller SR1568
Page 66 of 87
The return preheating function can be used for transferring heat from a heat source to the
heating circuit return.
The relay (system-dependent) is energized when both switch-on conditions are fulfilled:
• The temperature difference between the sensors of tank and sensor of the heating circuit
return has exceeded the switch-on temperature difference.
• The temperature at the heating circuit return has exceeded its minimum temperature.
The switch-on hysteresis is -5 K.
AUX (Auxiliary function)
Auxiliary functions can be set under “Aux” menu; controller can activate several auxiliary
functions simultaneously.
Note: sometimes, the selected auxiliary function needs an input to connect an extra
sensor input and an output to connect a pump or electromagnetic valve. When there
is no free input or output, this auxiliary function can’t be triggered. And at such case,
under the submenu, the auxiliary functions are already deactivated.
Depend on the selected system; following functions may not be triggered.
SFB solid fuel boiler function
The solid fuel boiler function can be used for transferring heat from a solid fuel boiler to a
tank.
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 solid fuel boiler sensor has exceeded its minimum temperature
The temperature at the tank sensor has fallen below its maximum temperature
When the preset temperature difference is exceeded, pump speed control starts. For every
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