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51
Torque min. 180 in-lb, for control of air dampers
Application
For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be
done in accordance with the damper manufacturer’s specifications. Control is On/Off
from an auxiliary contact, or a manual switch.
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.
Operation
The AFB N4(H) and 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) and AFX N4 series provides 95° of rotation and is provided with a
graduated position indicator showing 0° to 95°.
The actuator may be stalled anywhere in its normal rotation without the need of
mechanical end switches.
The AFB24-S N4(H), AFX24-S N4 version are provided with two built-in auxiliary
switches. These SPDT switches are provided for 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°.
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]
D3
12
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Technical Data
AFB24 N4(H), AFB24-S N4(H),
AFX24 N4, AFX24-S N4
Power supply
24 VAC ± 20% 50/60 Hz
24 VDC +20% / -10%
Power consumption
running 5 W / heater 25 W
holding 2.5 W
Transformer sizing
7.5 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 cable, with or without 1/2” conduit
connector
-S models:
Two 3 ft [1m], 10 ft [3m] or
16 ft [5m] appliance cables with or without 1/2”
conduit connectors
Overload protection
electronic throughout 0 to 95° rotation
Control
on/off
Torque
180 in-lb [20 Nm] minimum
Direction of rotation
spring reversible with CW/CCW mounting in housing
Mechanical angle of rotation
95° (adjustable with mechanical end stop, 35° to
95°)
Running time
motor < 75 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
<50dB(A) motor @ 75 seconds
≤
62dB(A) spring return
Servicing
maintenance free
Quality standard
ISO 9001
Weight
9.7 lbs (4.4 kg); 10 lbs (4.5 kg) with switches;
10.5 lbs (4.8 kg) with heater
† Rated Impulse Voltage 800V, Type of action 1.AA (1.AA.B for -S version), Control Pollution Degree 4.
AFB24-S N4(H), AFX24-S N4
Auxiliary switches
2 x SPDT 3A (0.5A) @ 250 VAC, UL approved
one set at +10°, one adjustable 10° to 90°
AFB24 N4(H), AFB24-S N4(H), AFX24 N4, AFX24-S N4
NEMA 4, On/Off, Spring Return, 24 V
N40103 - 09/11 - Subject to change.
© Belimo
Aircontrols (USA),
Inc
.
