MENU 7.1.6 - HEATING
This menu contains sub-menus where you can make ad-
vanced settings for heating operation.
MENU 7.1.6.1 - MAX DIFF SUPPLY TEMP
Max diff compressor
Setting range: 1 – 25 °C
Max diff 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 respectively. Max
difference additional heat can never exceed max difference
compressor
Max diff compressor: If the current supply temperature ex-
ceeds the calculated supply line by the set value, the degree
minute value is set to 1. The compressor stops when there
is only a heating demand.
Max diff 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 temperature
sensor, heating medium supply (BT25), and temperature
sensor, condenser supply (BT12), you can set a fixed offset
here to compensate for the difference.
MENU 7.1.6.2 - FLOW SETTINGS, CLIMATE SYS
Setting
Options: Radiator, Underfl heating, Rad + Und. heat., Own
setting
DOT
Setting range DOT: -40.0 – 20.0 °C
Delta temp at DOT
Setting range dT at DOT: 0.0 – 25.0 °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
Manually selected power at DOT
Alternative: on/off
Power at DOT
Setting range: 1 – 1,000 kW
Here, you set the power the property requires at DOT (dimen-
sioned outdoor temperature).
If you choose not to activate "Manually selected power at
DOT", the setting is made automatically, i.e. S1256 calculates
suitable power at DOT.
MENU 7.1.8 - ALARMS
In this menu, you make settings for the safety measures
that S1256 will implement in the event of any operational
disruption.
MENU 7.1.8.1 - ALARM ACTIONS
Reduce room temperature
Alternative: on/off
Stop producing HW
Alternative: on/off
Audio signal on alarm
Alternative: on/off
Select how you want the S1256 to alert you that there is an
alarm in the display here.
The different alternatives are that S1256 stops producing
hot water and/or reduces the room temperature.
Caution
If no alarm action is selected, this can result in
higher energy consumption in the event of a mal-
function.
MENU 7.1.8.2 - EMERGENCY MODE
Immersion heater output
Setting range 1x230 V: 4 – 7 kW
Setting range 3x400 V: 4 – 9 kW
Settings are made in this menu for how the additional heat
will be controlled in emergency mode.
Caution
In emergency mode, the display is switched off. If
you feel the selected settings are insufficient in
emergency mode, you will not be able to change
these.
MENU 7.1.9 - LOAD MONITOR
Fuse size
Setting range: 1 – 400 A
Transformer ratio
Setting range: 300 – 3,000
Detect phase sequence
Alternative: on/off
Here, you set fuse size and transformer ratio for the system.
The transformer ratio is the factor that is used to convert
the metered voltage to current.
NIBE S1256Chapter 9 | Control - Menus56
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