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TIP
It is also possible to create your own curve. This
is done in menu 1.30.7.
Caution
With underfloor heating systems, the maximum
supply temperature is normally set between 35
and 45 °C.
TIP
If the room temperature is constantly too low/high,
you increase/decrease the curve offset by one
step.
If the room temperature changes when the out-
door temperature changes, you increase/decrease
the curve slope by one step.
Wait 24 hours before making a new setting, so that
the room temperature has time to stabilise.
MENU 1.30.2 - CURVE, COOLING
Curve, cooling
Setting range: 0 – 9
In the "Curve, cooling" menu you can view the cooling curve
for your house. The task of the cooling curve is, together
with the heating curve, to provide a uniform indoor temper-
ature, regardless of the outdoor temperature, and thereby
energy-efficient operation. It is from these curves that
S1256PC determines the temperature of the water to the
heating system, the supply temperature, and consequently
the indoor temperature. Here, you can select the curve and
read how the supply temperature changes at different out-
door temperatures. The number to the right of "system"
shows the system for which you have selected the curve.
Caution
Must be restricted with underfloor cooling min.
flow line temp. to prevent condensation.
Cooling in 2-pipe system
For operating mode "cooling" to be permitted, the average
temperature must be above the set value for "start cooling"
in menu 7.1.10.2 "Auto mode setting". The alternative is to
activate cooling by selecting "manual" operating mode in
menu 4.1 "Operating mode".
The cooling settings for the climate system are adjusted in
the indoor climate menu, menu 1.
38
Chapter 9 | Control - Menus
MENU 1.30.3 - EXTERNAL ADJUSTMENT
External adjustment
Setting range: -10 – 10
Setting range (if room sensor is installed): 5 – 30 °C
Connecting an external switch, for example a room thermo-
stat or a timer, allows you to raise or lower the room temper-
ature temporarily or periodically. When the switch is on, the
heating curve offset is changed by the number of steps se-
lected in the menu. If a room sensor is installed and activ-
ated, the desired room temperature (°C) is set.
If there is more than one climate system, the setting can be
made separately for each system and zone.
MENU 1.30.4 - LOWEST SUPPLY HEATING
Heating
Setting range: 5 – 80 °C
Set the minimum temperature on the supply temperature
to the climate system. This means that S1256PC never cal-
culates a temperature lower than that set here.
If there is more than one climate system the setting can be
made separately for each system.
MENU 1.30.5 - LOWEST SUPPLY COOLING
Cooling
Setting range 7 – 30 °C
Alarm, room sensor during cooling
operation
Setting range: on/off
Set the minimum temperature on the supply temperature
to the climate system. This means that S1256PC never cal-
culates a temperature lower than that set here.
If there is more than one climate system the setting can be
made separately for each system.
Here, you can receive alarms during cooling operation, for
example if a room sensor malfunctions.
NOTE
Cooling flow line must be set with regard to which
climate system is connected. For example, floor
cooling with too low cooling flow line can cause
condensation precipitation, which in the worst in-
stance could lead to moisture damage.
MENU 1.30.6 - HIGHEST SUPPLY HEAT
Climate system
Setting range: 5 – 80 °C
NIBE S1256PC
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