Fire-resistant damper model BKA-Ü
Technical documentation
Spring return actuators
Construction subject to change
No return possible
Version: 2021-07-01 | Page 27
Technical data of spring return actuators
24 V actuators (B10/B20/B32)
Table 9: Technical data of B10/B20/B32 (24 V spring return ac-
tuators)
Electric spring return actuators with thermoelectric release
device BAT (assignment of the actuator types according to the
BKA-Ü dimensions, as per Table 8 page 26).
Release temperatures: ambient temperature 72 °C and
internal duct temperature 72 °C
Operating position (damper "OPEN") is approached au-
tomatically and return spring is tensioned by applying
the supply voltage to the relay module RM. It supplies
the spring return actuator with supply voltage (24 V).
! Thus, the safety function is ensured.
Safety position (damper "CLOSED") through spring
force when supply voltage is interrupted by smoke de-
tection system RMS or the temperature fuses (ambient
temperature 72°C or internal duct temperature 72°C)
of the spring return actuator respond. The response of
the thermal fuses interrupts the supply voltage perma-
nently and irrevocably.
Display of the damper end positions is possible by
means of integrated micro switches via potential-free
changeover contacts (connected on-site) (S1
–
S3
"CLOSED" indicates the "closed" position; S4
–
S6
"OPEN" indicates the "opened" position).
Manual actuation and fixing in any position is possible
in the de-energised state. It is unlocked manually.
On-site function control is possible by means of the
control key of BAT.
Spare parts: Temperature fuse for temperature inside
the duct (ZBAT72). Exchange takes place by unscrewing
the two screws of the thermoelectric release device.
Remove the thermo-electrical trigger device from the
actuator unit. Remove the internal duct temperature
fuse (ZBAT72) from the thermoelectric release device
and replace it with a new internal duct temperature
fuse (ZBAT72). Screw the thermo-electrical trigger de-
vice back onto the actuator unit.
For any other damage etc., the entire "actuator/ther-
mal release device" must be replaced completely.
Actuator type
B10
(BFL24-T-ST SO)
B20
(BFN24-T-ST SO)
B32
(BF24-TN-ST SO)
Rated voltage [V]
AC/DC 24
Rated voltage frequency [Hz]
50/60
Functional range [V]
AC 19.2…28.8 / DC 21.6…28.8
Power consumption during operation
[W]
2.5
4
7
Power consumption in idle position
[W]
0.8
1.4
2
Power consumption/dimensioning
4 VA / I
max
8.3 A @ 5 ms
6 VA / I
max
8.3 A @ 5 ms
10 VA / I
max
8.3 A @ 5 ms
Auxiliary switch
2 x EPU
Switching capacity of auxiliary switch
1 mA…3 (0.5 inductive) A, AC 250 V
1 mA…6 (3) A, DC 5 V…AC 250 V
Connection of supply / control
Cable 1 m, 2 x 0.75 mm² (halogen-free), with 3-pin connector
Auxiliary switch connection
Cable 1 m, 6 x 0.75 mm² (halogen-free), with 6-pin connector
Motor runtime
<60 s /90°
<120 s /90°
Spring return runtime
20 s @ -
10…55°C / <60 s @
-
30…
-10°C
̴
16 s (t
amb
= 20°C)
Protection class IEC/EN
Safety extra low voltage III
Protection class auxiliary switch IEC/EN
II protective insulation
Degree of protection IEC/EN
IP54
Ambient temperature Normal opera-
tion
-
30…55°C
-
30…50°C
Storage temperature
-
40…55°C
-
40…50°C
Ambient humidity
95% r.H., non-condensing
Ambient temperature safety incident: Reaching the safety position is guaranteed up to max. 75 °C.
