Nibe S1255-12, Руководство по установке, Страница: 24 / 92

• "External adjustment"
To change the supply temperature and in doing so
change the room temperature, an external switch
function can be connected to S1255.
When the switch is closed, the temperature is
changed in °C (if a room sensor is connected and ac-
tivated). If a room sensor is not connected or not ac-
tivated, the desired change of "Temperature" (heating
curve 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 ac-
cessories.
– climate system 1 to 8
The value for the change is set in menu 1.30.3,
"External adjustment".
• activation of one of four fan speeds.
(Can be selected if ventilation accessory is activated.)
The following five options are available:
– 1-4 is normally open (NO)
– 1 is normally closed (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 net-
works that support the "SG Ready" standard.
"SG Ready" requires two AUX inputs.
In cases where this function is wanted, it must be
connected to terminal block X28 on the PCB (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 heat and/or compressor in
the heat pump at certain times of the day (can be se-
lected 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
(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 S1255 and
additional heat are blocked in the same way as
today’s tariff blocking.
–
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
savings 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 set-
table 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 S1255
for blocking various functions. The switch must be po-
tential-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 circu-
lation (HWC) remains in operation.
• compressor
• internally controlled additional heat
• tariff blocking (additional heat, compressor, heating,
cooling and hot water are disconnected)
Possible selection for AUX output (potential
free variable relay)
It is possible to have an external connection by means
of a relay function via a potential-free switching relay
(max 2 A) on the PCB (AA2), terminal block
X27:NO,C,NC. The function must be activated in menu
7.4.
1
2
3 NO
C
NC
AA2-X27
K10
The picture shows the relay in the alarm position.
If S1255 is switched off or in emergency mode, the relay
is in alarm position.
Caution
The relay outputs may be subjected to a max
load of 2 A at resistive load (230V AC).
NIBE S1255 Chapter 5 | Electrical connections 24