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ARENA 30 C
2.7 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.
2.8 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 TERMI-
NALS WILL CAUSE IRREVERSIBLE DAMAGE
TO THE ELECTRONIC 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 connection to the mains or using bat-
teries, 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
setting on the menu or on the remote control.
• DHW exclusion switch (5-6) for remotely dis-
able the DHW function. Open contact will ex-
clude DHW.
• 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. 4.11). 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.
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)
1
2
3
4
5
6
7
A
B
C
D
A Room thermostat
B Eco/Comfort selection switch
C Domestic hot water exclusion switch
D External temperature sensor
E Remote control
Fig. 10 a
Fig. 10 b
8
9
10 11 12
E
Fig. 10 c
15
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