Setting protective functions
When the temperature falls below the system protection temperature, the system will be in
the "Collector protection" function again. When the temperature falls below the collector
protection temperature, the system will be in normal operating mode.
9.4 Setting the "Recooling" function
Risk of damage to the solar power system if operated with the "Recooling"
function in combination with reheating.
Make sure that reheating is not in operation before you activate the
"Recooling" function.
The "Recooling" function can be activated only if the "Collector protection"
function is active.
This function protects the system against overheating in the following situations:
• If no hot water is used over an extended period of time (e. g. during a vacation)
• If the collector protection temperature is exceeded
If the temperature in the collector falls below the temperature in the storage tank (usually
at night), the solar circuit pump switches on. This recools the storage tank to a preset
temperature.
The "Basic settings" menu allows you to set the following parameters:
• P:5: "Collector protection" function
• P:6: Collector protection temperature
• P:8: "Recooling" function
• P:9: Temperature to which the storage tank is recooled.
9.5 Setting the "Drain-back" function
The "Drain-back" function can be activated only if the "Recooling" function has
The "Drain-back" (return flow) function protects the solar power system against overheating
and frost. This function requires the installation of a collection tank. When the solar circuit
pump is switched off, heat transfer fluid flows back into the collection tank. In the process,
the heat transfer fluid is cooled down or heated up.
When the solar circuit is switched back on, it will initially run for the duration of the preset
pump runtime with full pump output. Afterwards the solar circuit pump will then run in
normal operating mode again.
The "Basic settings" menu allows you to set the following parameters:
• P:6: Collector protection temperature
• P:7: Pump runtime "Drain-back" function
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