The Belimo AF24 US actuator is for fail-safe control of dampers in HVAC systems. Control is On/Off from an a manual switch. The universal clamp is used to mount the actuator directly to a damper shaft up to 1.05” in diameter. A crankarm and several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft. Damper manufacturer's specifications will determine the actuator sizing.
The AF24 US actuator provides true spring return operation and positive close off on air tight dampers. The spring return system provides consistent torque of a min of 133 in-lb to the damper with, and without, power applied to the actuator.
The AF24US uses a brushless DC motor which is ASIC(Application Specific Integrated Circuit) controlled. The ASIC monitors and controls the actuator’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.
Product Specifications
| Power supply |
24 VAC ± 20% 50/60 Hz, 24
VDC ± 10% |
| Power consumption running |
5 W |
| Power consumption holding |
1.5 W |
| Transformer
sizing |
10 VA (class 2 power
source) |
| Electrical
connection |
3 ft, 18 GA appliance cable,
1/2” conduit connector |
| Electrical
protection |
auxiliary switches are
double insulated |
| Overload
protection |
electronic throughout 0° to
95° rotation |
| Angle of
rotation |
95°, adjustable 35 to 95°
w/ZDB-AF2 US |
| Torque |
133 in-lb [15 Nm]
constant |
| Direction of
rotation |
reversible with CW/CCW
mounting |
| Position
indication |
visual indicator, 0° to
95°(0° is spring return position) |
| Manual override |
3mm hex crank (shipped
w/actuator) |
| Running time |
150 sec. constant,
independent of load, spring
return < 20 sec |
| Humidity |
5 to 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 type 2 / IP54 |
| Housing material |
zinc coated steel |
| Agency listings |
cULus acc. to UL 873 and
CAN/CSA C22.2 No. 24-93 |
| Noise level max. |
45 dB (A) |
| Servicing |
maintenance free |
| Quality standard |
ISO 9001 |
| Weight |
6.0 lbs (2.7
kg) |