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Power steps of the immersion heater
The table(s) displays the total phase current for the immer-
sion heater.
In addition to this, there is the current for compressor oper-
ation.
3x400 V
Max electrical
Maxphasecur-
addition (kW)
rent L1(A)
0.0
–
0.5
2.2
1.0
–
1.5
2.2
2.0
–
2.5
2.2
3.0
–
3.5
2.2
4.0
–
4.5
2.2
5.0
–
5.5
2.2
6.0
–
1
6.5
2.2
1 Factory setting
1x230 V
Max electrical
Max phase current L1(A)
addition (kW)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
1
4.5
1 Factory setting
When the current sensors are connected, S1256PC monitors
the phase currents and allocates the power steps automat-
ically to the least loaded phase.
NOTE
If the current sensors are not connected, S1256PC
calculates how high the currents will be if the rel-
evant power steps are added. If the currents are
higher than the set fuse size, the power step is not
allowed to cut in.
NIBE S1256PC
Maxphasecur-
Max phase
rent L2(A)
current L3(A)
–
–
–
–
4.3
–
4.3
–
–
8.7
–
8.7
4.3
8.7
4.3
8.7
11.5
7.5
11.5
7.5
7.5
15.6
7.5
15.6
11.5
15.6
11.5
15.6
–
2.2
4.3
6.5
8.7
10.9
13.0
15.2
17.4
19.6
EMERGENCY MODE
Emergency mode is used in event of operational interference
and in conjunction with service.
When S1256PC is put into emergency mode, the system
works as follows:
•
The compressor is blocked.
•
S1256PC prioritises heating production.
•
Hot water is produced if possible.
•
The load monitor is not active.
•
Max output for the immersion heater in emergency mode,
limited according to the setting in menu 7.1.8.2 - "Emer-
gency mode".
•
Fixed supply temperature if the system has no value from
the outdoor temperature sensor (BT1).
When the emergency mode is active, the status lamp is yel-
low.
You can activate the emergency mode both when S1256PC
is running and when it is switched off.
To activate when S1256PC is running: press and hold the
on/off button (SF1) for 2 seconds and select "emergency
mode" from the shutdown menu.
To activate emergency mode when S1256PC is switched
off: press and hold the on/off button (SF1) for 5 seconds.
(Deactivate the emergency mode by pressing once.)
Chapter 5 | Electrical connections
25
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