Technical data sheet BFL24-T

Spring-return actuator, combined with

thermoelectric tripping device BAT
(72°C), for fire and smoke dampers
90° in ventilation and air-conditioning
systems.
• Nominal Torque 4 Nm / 3 Nm
• Nominal voltage AC/DC 24 V
• Control Open-close
• Spindle driver Form fit 12x12 mm,
Continuous hollow shaft

Technical data
Electrical data Nominal voltage AC/DC 24 V
Nominal voltage frequency 50/60 Hz
Nominal voltage range AC 19.2...28.8 V / DC 21.6...28.8 V
Power consumption in operation 2.5 W
Power consumption in rest position 0.8 W
Power consumption for wire sizing 4 VA
Power consumption for wire sizing note Imax 8.3 A @ 5 ms
Auxiliary switch 2 x SPDT
Switching capacity auxiliary switch 1 mA...3 (0.5 inductive) A, AC 250 V
Switching points auxiliary switch 5° / 80°
Connection supply / control Cable 1 m, 2 x 0.75 mm² (halogen-free)
Connection auxiliary switch Cable 1 m, 6 x 0.75 mm² (halogen-free)
Cable length thermoelectric tripping 0.5 m
device
Functional data Torque motor Min. 4 Nm
Torque spring return Min. 3 Nm
Direction of rotation motor Can be selected by mounting L/R
Manual override With position stop
Angle of rotation Max. 95°
Running time motor <60 s / 90°
Running time spring-return 20 s @ -10...55°C / <60 s @ -30...-10°C
Sound power level motor <43 dB(A)
Sound power level spring-return <62 dB(A)
Spindle driver Form fit 12x12 mm, Continuous hollow shaft
Position indication Mechanically, with pointer
Service life Min. 60,000 safety positions
Safety Response temperature thermal fuse Duct outside temperature 72°C
Duct inside temperature 72°C
Protection class IEC/EN III Safety extra-low voltage
Protection class auxiliary switch IEC/EN II Protective insulated
Degree of protection IEC/EN IP54 in all mounting positions
EMC CE according to 2014/30/EU
Low voltage directive CE according to 2014/35/EU
Certification IEC/EN IEC/EN 60730-1 and IEC/EN 60730-2-14
Mode of operation Type 1.AA.B
Rated impulse voltage supply / control 0.8 kV
Control pollution degree 3
Ambient temperature normal operation -30...55°C
Ambient temperature safety operation The safety position will be attained up to max.
75°C
Non-operating temperature -40...55°C
Ambient humidity 95% r.h., non-condensing
Maintenance Maintenance-free
Weight Weight 1.2 kg

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 Spring-return actuator 90°, AC/DC 24 V, 4 Nm / 3 Nm,
BFL24-T with BAT

Safety notes
• The device must not be used outside the specified field of application, especially not

! in aircraft or in any other airborne means of transport.

• The actuator is adapted and installed on the fire and smoke damper by the damper
manufacturer. For this reason, the actuator is only supplied directly to safety damper
manufacturers. The manufacturer then bears full responsibility for the proper
functioning of the damper.
• The two switches integrated in the actuator are to be operated either on power
supply voltage or at safety extra-low voltage. The combination power supply voltage/
safety extra-low voltage is not permitted.
• Cables must not be removed from the device.
• The device may only be opened at the manufacturer’s site. It does not contain any
parts that can be replaced or repaired by the user.
• The device contains electrical and electronic components and must not be disposed
of as household refuse. All locally valid regulations and requirements must be
observed.

Product features
Mode of operation The actuator moves the damper to the operating position at the same time as
tensioning the return spring. The damper is turned back to the safety position by spring
energy when the supply voltage is interrupted.
Safety Position Lock The Safety Position Lock™ reliably holds the fire damper in the safety position in case
of fire therefor ensuring maximum safety. The technical solution for this function of the
BFL and BFN actuators has a patent pending.
Thermoelectric tripping device Complies with the specific requirements of the standard ISO 10294-4.
BAT: If the ambient temperature of 72°C is exceeded, then the duct outside
temperature fuse will respond. If the duct inside temperature of 72°C is exceeded,
then the duct inside temperature fuse will respond. When one of the thermal fuses
responds, the supply voltage is interrupted permanently and irreversibly.
The LED is on when
- supply voltage is available
- the thermal fuses are OK and
- the test switch is not pressed.
Note: The function of the thermal fuses and the control key is only warranted if the
actuator is connected to the supply voltage (LED on).
Signalling Two microswitches with fixed settings are installed in the actuator for indicating the
damper end positions. The electrical contacts of these microswitches are equipped
with a gold/silver coating that permits integration both in circuits with low currents
(mA range) and in ones with larger-sized currents (A range) in accordance with the
specifications in the data sheet. It should be noted with this application however that
the contacts can no longer be used in the milliampere range after larger currents have
been applied to them, even if this has taken place only once.
The position of the damper blade can be read off on a mechanical position indication.
Manual operation Without power supply, the actuator can be operated manually and fixed in any required
position. It can be unlocked manually or automatically by applying the supply voltage.
Standards / regulations The design of the actuator is based on the specific requirements from the European
standards:
- EN 15650 Ventilation for buildings – Fire dampers
- EN 1366-2 Fire resistance tests on service installations
(Part 2: Fire dampers)
- EN 13501-3 Fire classification of construction products and building elements
(Part 3: Classification using data from fire resistance tests on products and elements
used in building service installations: fire resisting ducts and fire dampers)
Recommendation for application Regular operational checks (open-close control of the fire damper) enhance the
safety of people, animals, property and the environment. Unless other requirements
are stipulated – e. g. in the damper manufacturer’s operating instructions – Belimo
recommends the performance of monthly operational checks. Fire damper actuators
from Belimo are designed in accordance with service life specifications contained in
the technical data sheet for regular operational checks. Notes for regular operational
checks can be found in the European Product Standard for Fire Dampers (EN 15650)
under “Maintenance information”.

2 BFL24-T • en-gb • 2016-01-25 • subject to changes www.belimo.eu

 Spring-return actuator 90°, AC/DC 24 V, 4 Nm / 3 Nm,
BFL24-T with BAT

Product features
Delivery notes Incl. Hand crank, Pointer, Protective bag, Form fit insert 12/10 mm

Accessories

Description Type
Electrical accessories Auxiliary switch 2 x SPDT SN2-C7
Blanking cover for BAT (without thermal fuse for duct inside ZBAT0
temperature)
Spare tripping element for BAT, duct inside temperature = 72 °C, ZBAT72
sensor length = 65 mm
Spare tripping element for BAT, duct inside temperature = 72 °C, ZBAT72/9
sensor length = 90 mm
Spare tripping element for BAT, duct inside temperature = 95 °C, ZBAT95
sensor length = 65 mm
Spare tripping element for BAT, duct inside temperature = 95 °C, ZBAT95.1
sensor length = 65 mm (20 pcs.)
Spare tripping element for BAT, duct inside temperature = 95 °C, ZBAT95/9
sensor length = 90 mm
Spare tripping element for BAT, duct inside temperature = 120 °C, ZBAT120
sensor length = 65 mm
Cable set with plug, L = 0.5 m for communication and power supply unit ZST-BS
Description Type
Mechanical accessories Bracket for auxiliary switch (SN2-C7) for BFL, BFN ZSN-B

Electrical installation

Notes • Connection via safety isolating transformer.

! • Parallel connection of other actuators possible. Observe the performance data.
• Combination of power supply voltage and safety extra-low voltage not permitted
at the both auxiliary switches.

Wiring diagrams

AC/DC 24 V, open-close
T ~
– +

Cable colours:
1 = black
2 = red
1 2 S1 S2 S3 S4 S5 S6 S1 = violet
S2 = red
S3 = white
S4 = orange
<5° <80°
S5 = pink
S6 = grey
Tf: Thermal fuse (see “Technical
Tf Tf LED BAT data”)

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 Spring-return actuator 90°, AC/DC 24 V, 4 Nm / 3 Nm,
BFL24-T with BAT

Dimensions [mm]
Dimensional drawings

18
48
180
160
152
22 30

.05
+0 .2
60

48
80

77
/– 0
12

6.5

68 49
27 41
29

14
94
65

∅9.3
∅
58
39.1
40

8.3

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