Belimo Damper Actuator AF Series - AF24-US

Description

Product Description -
AF24-US
(NOS)
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.
The AF 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 consistent torque to the damper with, and without, power applied to the actuator.
The AF series provide 95ø of rotation and are provided with a graduated position ndicator showing 0ø to 95ø. The AF has a unique manual positioning mechanism which allows the setting of any damper position within its 95ø of rotation. The AF series actuators are shipped at +5ø (5ø from full fail-safe) to provide automatic compression against damper gaskets for tight shut-off. When power is applied to the AF series, the manual mechanism is released. The actuators will now try to close against the 0ø position during its normal control operations. The manual override can also be released physically by the use of a crank supplied with the actuator.
The AF uses a brushless DC motor which is controlled by an Application Specific Integrated Circuit (ASIC). 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.
The AF24-S US version is 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 +5ø, the other switch function is adjustable between +25ø to +85ø.
Power supply
24 VAC ñ20%, 50/60 Hz
24 VDC ñ 10%
Power consumption running 5 W
holding 1.5 W
Transformer sizing 10 VA (class 2 power source)
Electrical connection (-S models have 2 cables)
3 ft, 18 GA appliance cable
1/2? conduit connector
Electrical protection auxiliary switches are double insulated
Overload protection Electronic throughout 0 to 95ø rotation
Angle of rotation 95ø, adjustable 35 to 95ø w/ZDB-AF2 US
Torque 133 in-lb [15 Nm] constant
Direction of rotation reversible with CW/CCW mounting
Position indication visual indicator, 0ø to 95ø (0ø is spring return position)
Manual override 3mm hex crank (shipped w/actuator)
Auxiliary switches 2 x SPDT 7A (2.5A) @ 250 VAC, UL approved one set at +5ø, one adjustable 25ø to 85ø
Running time 150 seconds constant, independent of load, spring return < 20 seconds
Humidity max. 95% RH non-condensing
Ambient temperature -22øF to 122øF [-30øC to 50øC]
Storage temperature -40øF to 176øF [-40øC to 80øC]
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)