Entering system settings (Service menu – Settings)
6
RC35 programming unit - Technical specifications are subject to change without prior notice.
33
– Shut-down mode: The boiler and the heating circuit pump are switched off, and frost
protection is activated. The heating circuit pump runs only for purposes of frost protec-
tion.
Not recommended if there is a risk that the building could cool down too much.
– Room setback mode: If the room temperature falls below the set night temperature
(the target value), the heating system will operate in the same way as for reduced heat-
ing operation (as described under reduction mode "Reduced operation"). If the room
temperature exceeds the target night temperature by more than 1°K, the boiler and the
heating circuit pump are switched off (as described under reduction mode "Shut-down
mode").
This reduction mode is only possible if a programming unit / remote control unit has
been installed in a representative room (the reference room) or if the room temperature
is recorded using an external room sensor.
– Outdoor setback mode: If the "delayed" response to outside temperature falls
below a user-defined outside temperature threshold, the heating system will operate in
the same way as for reduced heating operation (as described under "Reduced opera-
tion"). Above this threshold, the heating system will be switched off (as described
under reduction mode "Shut-down mode"). This reduction mode is suitable for heating
circuits which do not have their own programming unit / remote control unit. The oper-
ating mode protects the rooms from cooling down too much once a certain outside
temperature is reached.
6.3.5 Frost protection
The frost protection function comprises the following options:
– No frost protection (frost protection is switched off)
– Outside temperature (outside sensor required) If the outside temperature falls below
the threshold given by the set frost protection temperature, the heating circuit pump is
switched on automatically.
– Room temperature
(room sensor in the RC35 / RC20) If the room temperature falls
below the fixed value of 5°C, the heating circuit pump is switched on automatically. If the
room temperature rises above 7°C, the heating circuit pump is switched off automatically.
Caution: System damage caused by freezing
The settings no frost protection and room temperature provide either no
frost protection or inadequate frost protection. When these settings are select-
ed, the display shows a message indicating the risk of freezing.
z For reliable frost protection, use the outside temperature setting.
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