User manual

31
741.011 | 12.18
EN
11.3.5 Anti-freeze
Attempts to prevent freezing of the collectors by pumping heat from the
storage tank into the collectors:
• Collector temperature below +5 °C: solar circuit pump is switched on.
• Collector temperature above +7 °C: solar circuit pump is switched off.
The frost protection function is only useful when the heat transfer fluid
contains insufficient or no anti-freeze. It is recommended to generally
use heat transfer fluid with anti-freeze!
Notice
Despite the frost protection function being activated, the solar system
can freeze under the following conditions:
• The storage tank is unloaded, a back-up heating system is not pre-
sent.
• Heat transfer fluid contains insufficient or no anti-freeze.
• Power outage
• Unsuitable position of the temperature sensor on the collector
• Collector sensor or cable is broken or has a short.circuit.
• The collectors are installed in a position exposed to the wind.
• Solar circuit pump is faulty.
Display Characteristic min. max.
Factory
setting
Activation on, oFF
oFF
11.3.6 Upper storage tank display
Shows the temperature in the upper region of the storage tank. For this,
an appropriate sensor must be connected to the tank. The measured
temperatures are not used for control purposes.
Display Characteristic min. max.
Factory
setting
Activation on, oFF
oFF
Sensor input for upper storage tank 1 ... 5 –