Instruction manual
7108686.02 (1-11/12) 10
I N S T A L L E R S e c t i o n ( e n )
11. ELECTRICAL CONNECTIONS
This machine is only electrically safe if it is correctly connected to an efcient earth system in compliance with current safety re-
gulations. Connect the boiler to a 230V single-phase earthed power supply using the supplied three core cable, observing correct
Live-Neutral polarity.
Use a double-pole switch with a contact separation of at least 3 mm.
When replacing the power supply cable, t a harmonised 3x0,75 mm
2
cable with a maximum diameter of 8 mm. To access the
terminal block, remove the front boiler panel (xed with two screws at the bottom), turn the control box downwards and access
terminal blocks M1, M2, M3, used for the electrical connections, after removing the protective cover. The 3.15 A fast-blowing fuses
are incorporated in the power supply terminal block (to check and/or replace the fuse, pull out the black fuse carrier).
SEE WIRING DIAGRAM IN ANNEX “SECTION” B AT THE END OF THIS MANUAL
Make sure that the overall rated power input of the accessories connected to the appliance is less than 2A. If it is higher, install
a relay between the accessories and the electronic board.
The connections in terminal blocks M1- M3 are high voltage (230 V). Before making connections, make sure the appliance is
disconnected from the power supply. Check the input polarity on terminal block M1: L (LINE) - N (NEUTRAL).
TERMINAL BLOCK M1
(L) = Live (brown)
(N) = Neutral (light blue).
= Earth (yellow-green).
(1) (2) = contact for Room Thermostat.
Put back the jumper on terminals 1-2 of boiler terminal block
M1 if the room thermostat is not used or if the Remote Control
is installed.
TERMINAL BLOCK M2
Terminals 1 (back-lighting) - 2 (earth) - 3 (+12V): connection to the
Remote Control (low voltage) supplied as an accessory.
Terminals 4 - 5 (common): Outdoor temperature sensor (supplied
as an accessory)
Terminals 6 - 5 (common): 2nd Auxiliary Sensor (sensors for solar
plant, cascade system, zone system, etc.).
Terminals 7 - 5 (common): 1st Auxiliary Sensor (sensors for solar plant, cascade system, zone system, etc.).
Terminals 9-10: storage tank sensor connection.
Terminal 8: not used.
TERMINAL BLOCK M3
Terminal 1-2: boiler pump supply 230 V AC (max 1 Amp)
Terminal 3-4: not used
Terminal 5-6: PWM signal of the modulating pump
Terminal 7-8: not used
Terminal 9 - 10: Domestic Hot Water tank pump (max 1 Amp)
Terminal 11 - 12: Heating System pump (device connected downstream of the hydraulic separator - max 1 Amp)
If the appliance is connected to an underoor system, install a limit thermostat to prevent the circuit from overheating.
Use the relative cable grommets at the bottom of the boiler to thread the cables through to the terminal blocks.