Selectable outputs
A selectable output is AA2-X27.
The output is a potential-free switching relay.
If S735 is switched off or in emergency mode, the relay is in
C-NC position.
Caution
The relay output may be subjected to a max load
of 2 A at resistive load (230V AC).
TIP
The AXC accessory is required if more than one
function is to be connected to the AUX output.
Possible selection for AUX inputs
Temperature sensor
Available options are:
• it is possible to connect two own sensors (BT37.1, BT37.2).
• ambient sensor (BT28) for outdoor air function (OEK S20)
Monitor
Available options are:
• pressure switch for climate system (NC).
• alarm from external units. The alarm is connected to the
control, which means that the malfunction is presented
as an information message in the display. Potential-free
signal of type NO or NC.
External activation of functions
An external switch function can be connected to S735 to
activate various functions. The function is activated during
the time the switch is closed.
Possible functions that can be activated:
• 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. External adjustment of climate systems 2 to 8
requires accessories.
– climate system 1 to 8
Setting the value for the change is performed in menu
1.30.3 - "External adjustment".
• activation of one of four fan speeds.
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 where your
electricity supplier can affect the indoor and hot water
temperatures 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 is
activated). Activate the function by connecting potential-
free switch functions to two inputs selected in menu 7.4
- "Selectable in/outputs" (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 S735 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 S735 for
blocking various functions. The switch must be potential-
free and a closed switch results in blocking.
NIBE S735Chapter 5 | Electrical connections26
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