
4
Working conditions
Exact damper function is provided under the following conditions:
a) maximum air velocity 15 m/s
b) underpressure max. -1500 Pa or overpressure max. 500 Pa.
Dampers can be installed in arbitrary position (horizontal or vertical blade axis).
Dampers are designed for macroclimatic areas with mild climate according to EN 60 721-3-3.
Temperature in the place of installation is permitted to range from -30°C to +50°C.
Design with actuating mechanism
Belimo actuators are used for dampers, series BEN, BEE, BE for 230V AC resp. 24 V AC/DC,
Schischek InMax 50.75-S actuators (universal 24V or 230V supply) are used for large size of
dampers.
After connection to the power supply voltage, the actuator moves the damper blade to the
"OPEN" position or "CLOSED" (according to the corresponding connection, see wiring diagram).
If the power supply is interrupted, the actuator stops at the current position. The signalling of the
"OPEN" and "CLOSED" damper blade positions is ensured by two built-in fixed “potential-free”
end- limit switches.
The actuator for operating the damper blade can be mounted in an insulated cover/box. It is
accessible after removing the cover lid. The electrical connection of the actuator is made with a
non-flammable cable (or a cable located in the adjoining cable duct), which passes through an
opening made in the wall of the insulated cover/box when installing the damper or when
connecting the actuator power cable. The cable entry must meet a minimum fire resistance of 30
minutes.
Actuating mechanism
Belimo modulating actuators, BEN (BEE)-SR series for 24V AC/DC are specially designed for
remote control of fire dampers. The position of the damper blade is adjustable by means of control
voltage 0 (2)...10V DC.
The signalling of the "OPEN" and "CLOSED" damper blade positions is ensured by two built-in
fixed “potential-free” limit switches.
The actuator for operating the damper blade is mounted in an insulated cover/box. It is accessible
after removing the cover lid. The electrical connection of the actuator is made with non-flammable
cables (or cables located in the adjoining cable duct), which pass through an opening made in the
wall of the insulated cover when installing the damper or when connecting the power cables of
the actuator. The cable entry must meet a minimum fire resistance of 30 minutes.