NOTE
If the current sensors are not connected, S1255
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.
EMERGENCY MODE
Emergency mode is used in event of operational interference
and in conjunction with service.
When S1255 is put into emergency mode, the system works
as follows:
• The compressor is blocked.
• S1255 prioritises heating production.
• Hot water is produced if possible.
• The load monitor is not active.
• The immersion heater is stepped according to the setting
in menu 7.1.8.2 - Emergency mode.
• Fixed supply temperature if the system has no value from
the outdoor temperature sensor (BT1).
You can activate the emergency mode both when S1255 is
running and when it is switched off.
When the emergency mode is active, the status lamp turns
yellow.
To activate when S1255 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 S1255 is switched off:
press and hold the on/off button (SF1) for 5 seconds. (De-
activate the emergency mode by pressing once.)
27Chapter 5 | Electrical connectionsNIBE S1255
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