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If the outside temperature falls below –15 °C, the heating
system changes from reduced mode to heating mode[3]. This
allows smaller heat emitters to be utilised.
Frost protection limit temperature (outside temperature
threshold)
Under this menu item the limit temperature for the frost
protection (outside temperature threshold) is set. It is only
effective if Outdoor temp., Room and outdoor temp. or Frost
protect is set in the menu.
NOTICE: Domestic hot water carrying parts
may be damaged beyond repair if the frost
protection limit temperature is set too low and
in prolonged periods with outside
temperature below 0 °C.
▶ Adjust frost protection limit temperature
(default setting = 5 °C) to the heating
system.
▶ Do not set the frost protection limit
temperature too low. Damage caused by a
low frost protection limit temperature is
not covered by the warranty.
▶ Set frost protection limit temperature and
frost protection for all heating circuits.
▶ To ensure frost protection for the entire
heating system, set either Outdoor temp.
or Room and outdoor temp. in the Frost
protect menu.
•
If the outside temperature exceeds the frost protection
limit temperature by 1 K ( °C) and there is no heat
requirement from the heating system, the heating pump
switches off.
•
If the outside temperature drops below the frost protection
limit temperature, the heating pump switches on.
The room temperature setting does not offer
absolute frost protection, because pipework
installed in façades, for instance, can freeze.
This can happen even though the temperature
in the reference room is considerably higher
than 5 °C as the result of outside heat sources.
If an outside temperature sensor is installed,
frost protection can be assured for the entire
heating system regardless of the control type
set:
▶ In the Outdoor temp. menu, set either
Room and outdoor temp. or Frost
protect.
CR 400 | CW 400 | CW 800
7.1.4 Screed drying menu
A screed drying program is set for the selected heating circuit
or the entire heating system in this menu. To dry a new screed
the heating system automatically runs the screed drying
program once.
Before using the screed drying program
reduce the DHW temperature at the heat
source to "min".
In case of a voltage failure the user interface automatically
continues with the screed drying program. The voltage failure,
however, must not last longer than the power reserve of the
user interface or the maximum interruption duration.
This menu is only available if at least one underfloor heating
circuit is installed in the system and adjusted.
NOTICE: Risk of damaging or destroying the
screed!
▶ With multi-circuit systems this function
can be used in combination with a heating
circuit with mixer.
▶ Set the screed drying according to the
instructions of the manufacturer.
▶ In spite of the screed drying function, visit
the system daily and keep the prescribed
records.
Service menu | 39
6 720 820 872 (2016/12)
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