9 Setting protective functions
In order to protect the solar power system against frost and overheating, the controller is
equipped with the following protective functions:
• "Collector protection" function
• "Storage tank protection" function
• "System protection" function
• "Recooling" function
• "Drain-back" function
• "Anti-freeze protection" function.
9.1 Setting the "Collector protection" function
This function protects the collector against overheating. If the preset collector protection
temperature is exceeded, the solar circuit pump switches on. The pump runs until the
temperature limit in the storage tank (95 °C) has been reached. This is done irrespective of
the preset maximum storage tank temperature.
If the temperature of the collector falls below the preset collector protection temperature by
10 °C, 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:5: "Collector protection" function
• P:6: Collector protection temperature.
9.2 "Storage tank protection" function
If a hydraulic layout with two storage tanks is used, the "Storage tank protection"
function will be automatically active and cannot be changed.
This function protects the storage tanks against overheating caused by faulty wiring or
any other possible faults. If the temperature limit is exceeded in one of the storage tanks
(95 °C), all switching outputs will be switched off. The storage tank will no longer be
charged.
When the temperature in the storage tank falls below the temperature limit again, the
system will be in normal operating mode again.
9.3 "System protection" function
The "System protection" function is active at all times and cannot be changed.
If the temperature of the collector exceeds the system protection temperature (collector
protection temperature + 10 °C), the "System protection" function will be triggered. The
solar circuit pump switches off.
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