The control type is selected in the menu "Basic settings" with the following value:
• P:5: "Collector protection" function
− "Drain-back" time-controlled function
Time-controlled
You can set a time window and a pump runtime. In the time window the solar circuit pump
is switched on at certain specific intervals for the duration of the preset pump runtime.
The "Basic settings" menu allows you to set the following parameters:
• P:6: Collector protection temperature
• P:7: Pump runtime "Drain-back" function
The "Program" menu allows you to set the following parameters:
• Time window 4: Start for the "Tube collector" and "Drain-back" functions
• Time window 4: Stop for the "Tube collector" and "Drain-back" functions
9.6 Setting the "Anti-freeze protection" function
The "Anti-freeze protection" function can be activated only if the "Drain-back"
This function protects the solar power system against the heat transfer fluid freezing. If the
temperature falls below the preset temperature, the solar circuit pump switches on.
If the preset temperature is exceeded, the solar circuit pump switches off. The system will
run again in normal operating mode.
The "Basic settings" menu allows you to set the following parameters:
• P:18: "Anti-freeze protection" function
• P:19: "Anti-freeze protection" function: Selection of the sensor
• P:20: "Anti-freeze protection" function: Start temperature.
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