• SG ready
Caution
This function can only be used in mains networks
that support the "SG Ready" standard.
"SG Ready" requires two AUX inputs.
In cases where this function is required, it must be con-
nected to terminal block X28 on the base board (AA2).
"SG Ready" is a smart form of tariff control, through which
your electricity supplier can affect the indoor, hot water
and/or pool temperatures (if applicable) or simply block
the additional heating and/or the compressor in the heat
pump at certain times of the day (can be selected in menu
4.2.3 after the function has been activated). Activate the
function by connecting potential-free switch functions
to two inputs selected in menu 7.4 - "Selectable in/out-
puts" (SG Ready A and SG Ready B).
Closed or open switch means one of the following:
– Blocking (A: Closed, B: Open)
"SG Ready" is active. The compressor in S1256 and addi-
tional heat are blocked.
– Normal mode (A: Open, B: Open)
"SG Ready" is not active. No effect on the system.
– Low price mode (A: Open, B: Closed)
"SG Ready" is active. The system focuses on costs sav-
ings and can for example exploit a low tariff from the
electricity supplier or over-capacity from any own power
source (effect on the system can be adjusted in the
menu 4.2.3).
– Overcapacity mode (A: Closed, B: Closed)
"SG Ready" is active. The system is permitted to run at
full capacity at over capacity (very low price) with the
electricity supplier (effect on the system is settable in
menu 4.2.3).
(A = SG Ready A and B = SG Ready B )
External blocking of functions
An external switch function can be connected to S1256 for
blocking various functions. The switch must be potential-
free and a closed switch results in blocking.
NOTE
Blocking entails a risk of freezing.
Functions that can be blocked:
• heating (blocking of heating demand)
• hot water (hot water production). Any hot water circulation
(HWC) remains in operation.
• compressor
• internally controlled additional heat
• tariff blocking (additional heat, compressor, heating,
cooling and hot water are disconnected)
Possible selections for AUX output
Indications
• alarm
• low electricity price (Smart Price Adaption)
• defrosting ambient air collector (only applies if there are
cooling accessories)
• common alarm
• cooling mode indication (only applies if there are cooling
accessories)
• extra cooling (only applies if there are cooling accessories)
• delayed cooling mode indication (only applies if there are
cooling accessories)
• holiday
• away mode
Control
• circulation pump for hot water circulation
• external heating medium pump
• ground water pump
• external reversing valve for hot water
NOTE
The relevant distribution box must be marked with
a warning about external voltage.
Connecting external circulation pump
An external circulation pump is connected to the AUX out-
put, as illustrated below.
1
2
3
NO
C
NC
AA2-X27
L N PE
L
N
PE
Settings
ELECTRICAL ADDITION - MAXIMUM OUTPUT
Number of steps, maximum electrical power and supply on
connection for the immersion heater varies depending on
model, see tables.
The electric additional heat may be restricted depending on
the selected country.
The immersion heater's power is split into steps (four steps,
if the immersion heater for 3x400 V is switched to maximum
9 kW), according to table.
27Chapter 5 | Electrical connectionsNIBE S1256
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