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LATIN AMERICA / CARIBBEAN
59
Torque min. 180 in-lb, for control of air dampers
Application
For proportional modulation of dampers in HVAC systems. Actuator sizing should be
done in accordance with the damper manufacturer’s specifications.
The actuator is mounted directly to a damper shaft up to 1.05” in diameter by means
of its universal clamp. A crank arm and several mounting brackets are available for
applications where the actuator cannot be direct coupled to the damper shaft.
The actuator operates in response to a 2 to 10 VDC, or with the addition of a 500
Ω
resistor, a 4 to 20 mA control input from an electronic controller or positioner. A 2 to
10 VDC feedback signal is provided for position indication. Not to be used for a
master-slave application.
Operation
The AFB N4(H), AFX N4 series actuators provide true spring return operation for
reliable fail-safe application and positive close-off on air tight dampers. The spring
return system provides constant torque to the damper with, and without, power
applied to the actuator.
The AFB N4(H), AFX N4 series provides 95° of rotation and is provided with a
graduated position indicator showing 0° to 95°.
The AFB24-SR N4(H), AFX24-SR N4 uses a brushless DC motor which is controlled by
an Application Specific Integrated Circuit (ASIC) and a microprocessor. The
microprocessor provides the intelligence to the ASIC to provide a constant rotation rate
and to know the actuator’s exact fail-safe position. The ASIC monitors and controls the
brushless DC motor’s rotation and provides a digital rotation sensing function to
prevent damage to the actuator in a stall condition. The actuator may be stalled
anywhere in its normal rotation without the need of mechanical end switches.
The AFB24-SR-S N4(H), AFX24-SR-S N4 version are provided with two built-in
auxiliary switches. These SPDT switches provide safety interfacing or signaling, for
example, for fan start-up. The switching function at the fail-safe position is fixed at
+10°, the other switch function is adjustable b10° to +90°.
ATTENTION:
AFB24-SR(-S) N4(H) and AFX24-SR(-S) N4
cannot
be tandem
mounted on the same damper or valve shaft. Only On/Off and MFT AF models can
be used for tandem mount applications.
Dimensions (inches [mm])
6.77”
[172]
Clamp Configurations
1/2” Field Selectable 3/4” Centered 1.05” Centered
(Default) (Field
Selectable)
12.99” [330]
6.45” [163.9]
0.39” [10]
0.92” [23.4]
3.62” [92.1]
9.37” [238]
1.12” [28.5]
3.36” [85.2]
3.5”
[0.14]
0.81”
[20.5]
1.17”
[29.8]
0.79”
[20]
D
31
2
_
C
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n
fi
g
Technical Data
AFB24-SR N4(H) AFB24-SR-S N4(H),
AFX24-SR N4 AFX24-SR-S N4
Power supply
24 VAC ±20%, 50/60 Hz
24 VDC +20% / -10%
Power consumption
running 5.5 W / heater 25 W
holding 3 W
Transformer sizing
6 VA (class 2 power source) / heater 25 VA
Electrical connection
AFB... N4
3 ft, 18 GA appliance cable, 1/2" conduit
connector
-S models:
two 3 ft, 18 gauge appliance cables
with 1/2” conduit connectors
heater (N4H) terminal block, 26-16 GA
AFX... N4
3 ft [1m], 10 ft [3m] or 16 ft [5m] 18 GA
appliance or plenum cables, with 1/2” conduit
connector
-S models:
Two 3 ft [1m], 10 ft [3m] or
16 ft [5m] appliance cables with 1/2" conduit
connectors
Overload protection
electronic throughout 0 to 95° rotation
Operating range Y
2 to 10 VDC, 4 to 20mA
Input impedance
100 k
Ω
for 2 to 10 VDC (0.1 mA)
500
Ω
for 4 to 20 mA
Feedback output U
2 to 10 VDC (max. 0.5 mA)
Torque
180 in-lb [10 Nm] minimum
Direction of rotation
spring reversible with CW/CCW mounting Inside housing
motor reversible with built-in switch
Mechanical angle of rotation
95° (adjustable with mechanical end stop, 35° to
95°)
Running time
motor 95 seconds
spring < 20 seconds @ -4°F to 122°F [-20°C to 50°C];
< 60 seconds @ -22°F [-30°C]
spring (with heater) < 20 seconds @ -4°F to 122°F [-20°C to 50°C];
< 60 seconds @ -49°F [-45°C]
Position indication
visual indicator, 0° to 95°
(0° is full spring return position)
Manual override
5 mm hex crank (
³⁄₁₆
" Allen), supplied
Humidity
max. 95% RH non-condensing
Ambient temperature
-22°F to 122°F [-30°C to 50°C]
with heater -49°F to 122°F [-45°C to 50°C]
Storage temperature
-40°F to 176°F [-40°C to 80°C]
Housing
UL Type 4, NEMA 4, IP66
Housing material
polycarbonate
Agency listings
†
cULus acc. to UL60730-1A/-2-14, CAN/CSA
E60730-1:02, CE acc. to 2004/108/EC &
2006/95/EC
Noise level
≤
40dB(A) motor @ 95 seconds
≤
62dB(A) spring return
Servicing
maintenance free
Quality standard
ISO 9001
Weight
9.7 lbs (4 kg); 10 lbs (4.5 kg) with switches
10.5 lbs (4.8 kg)
† Rated Impulse Voltage 800V, Type of action 1.AA (1.AA.B for -S version), Control Pollution Degree 4.
AFB24-SR-S N4(H), AFB24-SR-S N4
Auxiliary switches
2 x SPDT 3A (0.5A) @ 250 VAC, UL approved
one set at +10°, one adjustable 10° to 90°
AFB24-SR N4(H), AFB24-SR-S N4(H), AFX24-SR N4, AFX24-SR-S N4
NEMA 4, Proportional, Spring Return, 24 V, for 2 to 10 VDC or 4 to 20 mA Control Signal
N40103 - 09/11 - Subject to change.
© Belimo
Aircontrols (USA),
Inc
.
