Buderus B-THIW Notice D'installation Et D'utilisation page 37

3 Assembly
3.1 Installation instructions
• The room thermostat can be
combined with a variety of alternative
cover frames from manufacturers who
offer products with an internal
dimension of 55 mm.
• For mounting, appliance boxes with a
depth of 50 mm and an appliance
screw spacing of 60 mm are required.
• Rigid or flexible cables with a cross-
section of 0.75 - 1.5 mm
required for connecting the room
thermostat.
• Required electrical cables:
– 230 V: two cables for power
supply with one powered conductor (phase) and one
neutral conductor as well as a third cable for the
actuator at the heating circuit distributor.
– 24 V: two cables for the power supply and another two
cables for the supply of the 24 V actuator.
3.2 Assembly of the flush-mounted unit
DANGER
Risk of electric shock!
▶ Before carrying out work on any electrical components,
isolate them from the power supply (230 V AC) (fuse,
circuit breaker) and secure them against unintentional
reconnection.
▶ Remove the cover from the existing thermostat and loosen
the fastening.
Before loosening the wiring:
▶ Take a photo of the wiring on the existing appliance and
mark the cables in colour if necessary.
▶ Disconnect the wiring and remove the existing appliance.
B-THIW/B-THIW24 – 6721869243 (2024/08)
5 5
5 0
2
are
6 0
To connect and disconnect the individual wires:
▶ Use a small screwdriver to press the white lever handle of
the respective terminal point.
Variant 230 V
▶ Connect the powered conductor to
terminal L.
▶ Connect the neutral conductor to
terminal N.
▶ Connect the actuator cable (valve) to terminal 1.
Variant 24 V
▶ Connect 24 V voltage supply to
terminals with the heading "Supply".
▶ Connect the 2-wire line of the valve
drive to terminals "Valve".
Both variants
▶ Align the flush-mounted enclosure correctly (lettering
legible) and fasten it to the flush-mounted box with the
enclosed screws.
NOTICE
▶ Do not switch on the electric circuit yet.
Assembly 3
Supply Valve
24V~ 24V~
A B 1 B
37