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2.8 Electrical connections
Power supply
The boiler must be connected to a single-phase, 230 Volt-50 Hz power line, with max 3A fuses fitted between
boiler and the line, as well as a bipolar switch (ON/OFF) with contacts whose opening is at least 3 mm. The
boiler must always be properly earthed.
When electrically connecting the boiler to an electrical system with live and neutral, THE POLARITY MUST BE
RESPECTED (LIVE: brown wire / NEUTRAL: blue wire / EARTH: yellow-green). Note: If replacing the electrical
power cable, use only the "HAR H05 VV-F" cable, 3x0.75 mm2, with a maximum external diameter of 8 mm.
Room thermostat, external unit and auxiliary controls
Below the electrical control box is a multipolar terminal block, for connecting:
• Room thermostat (1-2)
WARNING: THE ROOM THERMOSTAT MUST NOT
HAVE LIVE CONTACTS. CONNECTING 230V TO
THE ROOM THERMOSTAT TERMINALS WILL
CAUSE IRREVERSIBLE DAMAGE TO THE ELEC-
TRONIC BOARD.
When connecting a room thermostat with daily or
weekly program, or a timer, avoid taking the power
supply to these devices from their switch contacts.
Their power supply must derive from a direct con-
nection to the mains or using batteries, depending
on the type of device.
This appliance can also operate without a room
thermostat, yet the latter is recommended for
increased comfort and greater energy savings.
• Switch for economy/comfort remote selection (3-
4). With the switch turned off the boiler is main-
tained in "Comfort", independently from the set-
ting on the menu or on the remote control.
• External temperature probe (7-8)
With the probe (optional) connected, the boiler
works in outside compensation temperature mode,
depending on the compensation curve settled (ref.
4.10). If none probe is connected, the boiler works
in standard mode and setting of a compensation
curve (parameter 9 of menu) is ignored by the
control system.
• Remote control (9-10), for remote control and regu-
lation of the boiler, with weekly chronothermostat
and climatic regulation functions.
• DHW storage probe (11-12), for the DHW storage
temperature regulation. The probe has to be posi-
tioned in the DHW storage sump.
To make these connections, unscrew the four screws
which fasten the lower protective plate and connect the
wires to the terminal block, respecting the position of
the terminals (refer to the wiring diagrams, chap. 1.5).
16
ARENA 30 A
1
2
3
4
5
6
7
A
B
D
A Room thermostat
B Eco/Comfort selection switch
D External temperature sensor
E Remote control
F DHW storage sensor
Fig. 10 a
Fig. 10 b
8
9
10 11 12
E
F
Fig. 10 c
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