7 Operating and display functions
12 Installation instructions 0020237057_01
Example: Two zones are connected and you set ZONE1. For
both zones, use the left-hand selection button Menu → Basic
settings → Operating mode to activate the Heating → Auto
operating mode. If the operator now uses the right-hand se-
lection button Op. mode to change the operating mode to
Day, the operating mode is changed only for ZONE1. The
Auto operating mode remains in place for ZONE2.
7.3.9 Activating automatic cooling
Menu → Installer level → System configuration → [System
----] → Automatic cooling
– Use this function to activate or deactivate automatic cool-
ing.
If a heat pump is connected and the Automatic cooling
function has been activated, the system control automatically
switches between heating mode and cooling mode.
7.3.10 Setting the cooling start temperature
Menu → Installer level → System configuration → [System
----] → Start OT cooling
– You can use this function to set the temperature
threshold from which cooling starts. If the outdoor tem-
perature is greater than the temperature threshold set,
the system control ends cooling mode.
Activating Cooling possible (→ Page 17)
7.3.11 Activating Source regeneration
Menu → Installer level → System configuration → [System
----] → Source regeneration
– If the Automatic cooling function is activated, you can
use the Source regeneration function.
When the Days away from home scheduling function is
activated, the system control switches the heating and cool-
ing off. If you also activate the Source regeneration func-
tion, the system control switches the cooling back on and
ensures that the heat from the living room is returned to the
ground via the heat pump.
7.3.12 Read current room air humidity
Menu → Installer level → System configuration → [System
----] → Current room air hum.
– You can use this function to read the current room air
humidity. The room air humidity sensor is installed in the
system control.
The function is activated only if the system control is installed
in the living room.
7.3.13 Reading the current dew point
Menu → Installer level → System configuration → [System
----] → Current dew point
– You can use this function to read the current dew point.
The current dew point is calculated from the current room
temperature and room air humidity. The system control ob-
tains the values for calculating the current dew point from the
room temperature sensor and room air humidity sensor.
To do this, the system control must be installed in the living
room and assigned to a zone. The thermostat function must
be activated.
7.3.14 Defining the hybrid manager
Menu → Installer level → System configuration → [System
----] → Hybrid manager
– You can use this function to determine the hybrid man-
ager with which the heating installation should be con-
trolled.
The hybrid heat pump always works with the triVAI function,
meaning that the Hybrid manager function does not appear
in the display.
triVAI: The price-oriented hybrid manager picks the heat
generator on the basis of the tariffs set in relation to the heat
demand.
Biv. point: The bivalence point hybrid manager picks the
heat generator on the basis of the outdoor temperature.
7.3.15 Setting the heating bivalence point
Menu → Installer level → System configuration → [System
----] → Heat. bivalence point
– If the bivalence point is selected for the Hybrid manager
function, you can then use the Heat. bivalence point
function.
When outdoor temperatures are low, a back-up boiler helps
the heat pump to fulfil the heat demand. You can use this
function to set the outdoor temperature above which the
back-up boiler remains switched off.
7.3.16 Setting the domestic hot water bivalence
point
Menu → Installer level → System configuration → [System
----] → DHW bivalence point
– When outdoor temperatures are low, a back-up boiler
helps the heat pump to fulfil the heat demand for do-
mestic hot water generation. You can use this function
to set the outdoor temperature below which the back-up
boiler is enabled.
Irrespective of the affected setting, the back-up boiler for the
anti-legionella function is activated.
7.3.17 Setting the alternative point
Menu → Installer level → System configuration → [System
----] → Alternative point
– If the bivalence point is selected for the Hybrid manager
function, you can then use the Alternative point func-
tion.
The function represents the alternative point. When the out-
door temperature lies below the set temperature value, the
system control always switches the heat pump off and the
back-up boiler fulfils the heat demand in heating mode.
7.3.18 Setting the temperature when the heat
pump fails
Menu → Installer level → System configuration → [System
----] → T. emergency mode
– If a heat pump is connected, you can use the T. emer-
gency mode function.
If the heat pump fails, the back-up boiler fulfils the heat de-
mand. To avoid higher heating costs due to the back-up
boiler, set a low flow temperature.
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