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LATIN AMERICA / CARIBBEAN
49
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 and AFX 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 and AFX 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 and AFX24-S versions 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°. The AFB24, AFB24-S, AFX24 and
AFX24-S actuator is shipped at +5° (5° from full fail-safe) to provide automatic
compression against damper gaskets for tight shut-off.
Dimensions
(Inches [mm])
K7-2
(supplied)
1/2"
Centered
(Default)
3/4"
Centered
(Field
Selectable)
1.05" Centered
(Field Selectable)
W
AFBNFBDi
m
AFB24, AFB24-S, AFX24, AFX24-S
On/Off, Spring Return, 24 V
Technical Data
AFB24, AFB24-S, AFX24, AFX24-S
Power supply
24 VAC ± 20% 50/60 Hz
24 VDC +20% / -10%
Power consumption
running 5 W
holding 2.5 W
Transformer sizing
7.5 VA (class 2 power source)
Electrical connection
AFB24...
3 ft, 18 GA appliance cable, 1/2" conduit
connector
-S models:
two 3 ft, 18 gauge appliance cables
with 1/2” conduit connectors
AFX24...
3 ft [1m], 10 ft [3m] or 16 ft [5m] 18 GA
appliance or plenum cables, 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
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]
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]
Storage temperature
-40°F to 176°F [-40°C to 80°C]
Housing
Nema 2, IP54, Enclosure Type2
Housing material
zinc coated metal and plastic casing
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
4.6 lbs (2.1 kg); 4.9 lbs (2.25 kg) with switches
† Rated Impulse Voltage 800V, Type of action 1.AA (1.AA.B for -S version), Control Pollution Degree 3.
AFB24-S, AFX24-S
Auxiliary switches
2 x SPDT 3A (0.5A) @ 250 VAC, UL approved
one set at +10°, one adjustable 10° to 90°
N40103 - 09/11 - Subject to change.
© Belimo
Aircontrols (USA),
Inc
.
