Entering system settings (Service menu – Settings)
6
RC35 programming unit - Technical specifications are subject to change without prior notice.
34
At what outside temp. should reduction be interrupted?
To maintain a comfortable level of warmth, the EN 12831 standard requires that heating
surfaces and heat generators be designed to ensure a given level of output when the heat-
ing system cools down below a given point as a result of night setback.
In the parameter At what outside temp. should reduction be interrupted?, you can
set an outside temperature threshold (this threshold applies to the delayed" response to
outside temperature; page 23).
Figure 7 shows how the frost protection function works, without this parameter activated
and with it activated. Settings selected: frost protection by outside temperature; frost
protection temperature 5°C.
Fig. 7 Effects of the parameter "At what outside temp. should reduction be inter-
rupted?". Left: parameter is set to "OFF" (factory setting). Right: parameter is
set to -15°C
T
A
Outside temperature
T
V
Flow temperature
1
Shut-down mode
2
Reduced operation (at set nighttime room temperature)
3
Heating operation (at set daytime room temperature)
If the outside temperature falls below the set value of -15°C, heating switches from
reduced operation to heating operation (Fig. 7, 3). This allows smaller heating surfaces to
be utilised.
The room temperature setting does not provide absolute frost protection be-
cause pipes laid in external walls could freeze even though the temperature in
the reference room might be clearly above 5°C due to external heat sources
(fireplace etc.).
T
A
T
A
T
V
5°C
T
V
5°C -15°C
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