Bosch RC35 - Frost Prot

System settings (Service menu – Settings)
Logamatic EMS – 6 720 801 387 (2011/05)
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• Room setback mode: The heating system operates as if in setback mode (as described under
“reduced operation”), if the room temperature falls below the selected night temperature (set
value). Boiler and heating circuit pump stop (as described under setback mode “shutdown
operation”) if the room temperature exceeds the set night temperature by more than 1 K.
This setback mode is only possible if a programming unit/remote control is installed in a
representative room (reference room) or if the room temperature is captured by an external room
temperature sensor.
• Outdoor compensation mode: if the adjusted outside temperature falls below the value of a
settable outside temperature threshold, the heating system works as in the reduced heating
mode (as described under “reduced mode).” The heating system remains off above this threshold
(as described under setback mode “shutdown operation”). This setback mode is suitable for
heating circuits which do not have their own programming unit / remote control unit. The
operating mode protects the rooms from cooling down too much once a certain outside
temperature is reached.
6.4.5 Frost prot.
The frost protection function offers the following options:
• No frost protection (frost protection is switched off).
• Outside temperature(outside temperature sensor required)If the outside temperature falls
below the threshold of the settable frost limit temperature, the heating circuit pump is
automatically switched on.
• Room temperature(Room temperature sensor of the RC35 or RC2x). If the room temperature
falls below the fixed set value of 5 °C, the heating circuit pump is automatically switched on. The
heating circuit pump stops automatically if the room temperature rises above 7 °C.
CAUTION: System damage through frost!
The settings no frost protection and room temperature provide either no frost
protection or inadequate frost protection. When these settings are selected, the display
shows a message indicating the risk of freezing.
B For reliable frost protection, use the outside temperature setting.
The setting room temperature offers no absolute frost protection, as lines routed
through external walls may freeze up, for example, although the temperature in the
reference room may be significantly above 5 °C.