Rehau NEA SMART 2.0 Service Manual page 37

3. Detection by dew point monitor connected to U-Module for mixed
circuit:
Mixed circuit is stopped. Cooling of all rooms connected to this
mixed circuit is stopped.
Frost protection
The frost alarm symbol is shown when the room temperature drops
below 5 °C.
When there is no heating mode active at this moment, (because e.g.
system is in STANDBY), heating is started with a set point of 8 °C.
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