10
Externa 30 O
Cod. 3540T540 - 04/2009 (Rev. 00)
Room thermostat
WARNING: THE ROOM THERMOSTAT MUST NOT HAVE LIVE CONTACTS. CONNECTING
240V TO THE ROOM THERMOSTAT TERMINALS WILL CAUSE IRREVERSIBLE DAMAGE TO
THE ELEC TRONIC BOARD.
When connecting a room thermostat with a 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 batteries, depending on the type of device.
fig. 5b
fig. 5a
opening of at least 3 mm. Max 3A fuses must be installed between the boiler and the line. The correct
polarity must be followed (PHASE: brown wire / NEUTRAL: blue wire / EARTH: yellow-green wire) in
the electrical connections.
If the supply flexible cord is damaged or the unit needs repairs it shall only be done by a qualified
person authorised by the supplier.
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.
Accessing the electrical terminal block
Follow the indications shown in figs. 5a and 5b to access to the electrical terminal block. The layout of
the terminals for the various connections is shown in the wiring diagram, in the chapter on Technical
Specifications.
1
2
3
4
