7105764.02 (1-11/12)
26
IN
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11. ELECTRICAL CONNECTIONS
This machine is only electrically safe if it is correctly connected to an efficient earth system in compliance with current safety re
-
gulations. Connect the boiler to a 230V single-phase earthed power supply using the supplied three-pin 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, fit a harmonised “HAR H05 VV-F” 3x0,75 mm
2
cable with a maximum diameter of 8 mm.
To access the terminal block, remove the front boiler panel (fixed with two screws at the bottom), turn the control box downwards
and access terminal blocks, used for the electrical connections, after removing the protective cover. The 2 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 block M1 are high voltage (230 V). Before making connections, make sure the appliance is di
-
sconnected from the power supply. Respect 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 - 2: connection to the Remote Control (low voltage)
supplied as an accessory.
Terminals 3 - 4: external Probe connection (supplied as an accessory)
Terminals 5 - 6: storage boiler sensor connection.
Terminal 7: not used.
Terminals 8 - 9 - 10: connection to external 3-way valve motor.
If the appliance is connected to an underfloor system, install a limit thermostat to prevent the latter from overheating.
Use the relative cable grommets at the bottom of the boiler to thread the cables through to the terminal blocks.
11.1 CONNECTING THE ROOM THERMOSTAT
The connections in terminal block M1 are high voltage (230 V). Before making connections, make sure the appliance is discon
-
nected from the power supply. Respect polarity L (LIVE) - N (NEUTRAL).
To connect the Room Thermostat to the boiler, proceed as described below:
• switch off the boiler;
•
access the terminal block
M1
;
•
remove the jumper from the ends of contacts
1-2
and connect the wires of the Room Thermostat;
• switch on the boiler and make sure the Room Thermostat works correctly.
11.2 ACCESSORIES NOT INCLUDED IN THE SUPPLY
11.2.1 EXTERNAL SENSOR
To connect this accessory, see figure to side (terminals 3-4)
and the instructions supplied with the sensor.
SETTING THE “Kt” CLIMATE CURVE
When the external sensor is connected to the boiler, the elec-
tronic board adjusts the flow temperature calculated according
to the set
Kt
coefficient. Select the required curve by pressing
as indicated in the chart in annex
“SECTION” E
for
selecting the most appropriate one (00 to 90).
Flow temp
Outside temp
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