Vents KP Series, User Manual

Page: 19 / 24

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CONNECTION TO POWER MAINS
The actuators featuring a return spring are designed to control fire-resisting dampers and smoke-extraction dampers installed in
ventilation and air-conditioning systems.
The return spring is cocked upon setting the damper flap to the horizontal position. In case of a power failure, the damper flap is re-set
to the protective position by the energy stored in the spring.
The damper does not require any limit switches and is overload-proof.
The thermally sensitive breaker Tf1 actuates upon ambient temperature exceeding 72 °C. The renewable thermally sensitive breakers Tf2
and Tf3 actuate upon the air duct temperature exceeding 72 °C. The operation of the renewable thermally sensitive breakers interrupts
the electric power supply in such a way that it prevents actuator re-activation without their replacement.
The button on the thermally sensitive breaker body enables testing the damper functionality.
The actuator is equipped with two fixed microswitches which signal the end positions.
Intermediate positions of the damper are shown by the mechanical indicator (needle).
The BF24-T and BFN24-T actuators are connected via an insulated transformer unit .
The damper can also be controlled manually and fixed in any position. The unit can be unlocked either manually using a hex wrench
(included) or automatically upon power-up.
The actuator connections (cables and wires) must be durable, insulated and heat-resistant.
The recommended minimum conductor cross-section is 0.75 mm2. The conductor cross-section selection must account for the maximum
permissible wire heating which depends on the wire type, its insulation, length and installation method (i.e. overhead, in cable channels
or inside walls).
Electrical connection of Belimo electric actuators with the highest torque, as
well as Siemens electric actuators
1 2
S1 S2 S3 S4
M
S5 S6
< 5°
< 80°
< 25°
< 145°
Tf1 Tf2 Tf3 LED
– +
T ~
N L1
AC 24 V
AC 230 V
DC 24 V
Thermal breaker
Connection via transformer
Several wires may be
connected with respect
to power consumption
Electrical connection of the basic models of Belimo and Zern electric
actuators, as well as Belimo and Zern models with increased torque
1 2
S1 S2 S3 S4
M
S5 S6
< 5°
< 80°
Tf1 Tf2 LED
– +
T ~
N L1
Connection via transformer
AC 230 V
DC 24 V
AC 24 V
Thermal breaker