In order to meet certain building regulations, it is pos-
sible to lock the device's maximum power output. In
this menu, you can set the value corresponding to the
heat pump's maximum power connection for heating,
hot water and cooling, if applicable Note whether there
are also external electrical components that are to be
included. After the value has been locked, a weeks
cooling-off period starts. After this period, parts in the
machine must be replaced in order to obtain greater
power.
MENU 7.1.6 - HEATING
This menu contains sub-menus where you can make
advanced settings for heating operation.
MENU 7.1.6.1 - MAX DIFFERENCE SUPPLY
TEMPERATURE
Max difference compressor
Setting range: 1 – 25 °C
Max difference additional heat
Setting range: 1 – 24 °C
BT12 offset
Setting range: -5 – 5°C
Here you set the maximum permitted difference
between the calculated and actual supply temperature
in the event of compressor or additional heat mode re-
spectively. Max difference additional heat can never
exceed max difference compressor
Max. difference, compressor: If the current supply
temperature exceeds the calculated supply by the set
value, the degree minute value is set to +1. The com-
pressor in the heat pump stops if there is only a heating
demand.
Max difference additional heat: If "Additional heat" is
selected and activated in menu 4.1 and the current
supply temperature exceeds the calculated temperature
by the set value, the additional heat is forced to stop.
BT12 offset: If there is a difference between temperat-
ure sensor, heating medium supply (BT25), and temper-
ature sensor, condenser supply (BT12), you can set a
fixed offset here to compensate for the difference.
MENU 7.1.6.2 - FLOW SETTING, CLIMATE
SYSTEM
Setting
Alternative: radiator, floor heat., rad. + floor heat.,
Own setting
Setting range DOT: -40.0 – 20.0 °C
Own setting
Setting range dT at DOT 0.0 – 25.0
Setting range DOT: -40.0 – 20.0°C
The type of heating distribution system the heating
medium pump works towards is set here.
dT at DOT is the difference in degrees between supply
and return temperatures at design outdoor temperature.
MENU 7.1.6.3 - POWER AT DOT
Alternative: Manually selected power at DOT, Power
at DOT
Manually selected power at DOT
Setting range: on/off
Power at DOT
Setting range: 1 – 100 kW
Here, you set the power the property requires at DOT
(dimensioned outdoor temperature).
If you choose not to activate "Manually selected power
at DOT", the setting is made automatically, i.e. S1255PC
selects suitable power at DOT.
MENU 7.1.7 - COOLING
Heating/cooling sensor
Alternative: Which sensors can be selected differs
depending on the installation.
Set point value, heating/cooling sensor
Setting range: 5 – 40 °C
Heating at room sub temp
Setting range: 0.5 – 10.0 °C
Cooling at room over temp
Setting range: 0.5 – 10.0 °C
Time between cooling and heating
Setting range: 0 – 48 h
You can use S1255PC to cool the house during hot
periods of the year.
53Chapter 9 | Control - MenusNIBE S1255PC
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