Possible selection for AUX inputs
Temperature sensor
Available options are:
• hot water top (BT7) (shows the water temperature at the
top of the tank. The temperature sensor is placed in the
submerged tube on the water heater.)
• six dedicated sensors (BT37.1 – BT37.6) for placing
wherever you want.
• cooling/heating (BT74), determines when it is time to
switch between cooling and heating mode (selectable
when the cooling function is activated in menu 7.2.1 -
"Add/remove accessories").
• external return line sensor (BT71)
• displayed hot water sensor for HWC (BT70). Placed on the
supply line.
• displayed hot water sensor for HWC (BT82). Placed on the
return line.
Monitor
Available options are:
• alarm from external units.
The alarm is connected to the control, which means that
the malfunction is shown as an information message in
the display. Potential free signal of type NO or NC.
• pressure switch for climate system (NC).
• level monitor
1
/ pressure switch / flow monitor for brine
(NC).
External activation of functions
An external switch function can be connected to S1156 to
activate various functions. The function is activated during
the time the switch is closed.
Possible functions that can be activated:
• forced control of brine pump
• hot water demand mode "More hot water"
• hot water demand mode "Small"
• “External adjustment”
When the switch is closed, the temperature is changed in
°C (if a room sensor is connected and activated). If a room
sensor is not connected or not activated, the desired
change of "Temperature" ("Offset") is set with the number
of steps selected. The value is adjustable between -10
and +10. Setting the value for the change is performed in
menu 1.30.3 - "External adjustment".
• activation of one of four fan speeds.
(Can be selected if ventilation accessory is activated.)
The following options are available:
– "Activate fan speed 1 (NO)" - "Activate fan speed 4 (NO)"
– “Activate fan speed 1 (NC)”
The fan speed is activated during the time the switch is
closed. Normal speed is resumed when the switch is
opened again.
• 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 S1156 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 S1156 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)
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(Accessory NV10)
27Chapter 5 | Electrical connectionsNIBE S1156
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