Aico Carbon Monoxide Alarm Ei 225EN - Manual (Page 17)

6. The Brown wire (terminal 3) must be connected to the house wiring coloured
brown or to a house terminal marked “L”. The Blue wire (terminal 4) must be
connected to the house wiring coloured blue or to a house terminal marked “N”.
The alarm does not need to be earthed, however for convenience a spare terminal
(no. 5) is provided to hold an earth wire if present.
7. Turn on the mains power to the CO Alarm circuit.
17
Figure 6 - Recessed Wiring Figure 5 - Surface Wiring
Conduit
Not Suitable
Locations for
Surface Wiring