AERCO Belimo AF120-S US Actuator - Manual (Page 2)

800-543-9038 USA 866-805-7089 CANADA 203-791-8396 LATIN AMERICA
56
Installation Instructions
Mechanical Installation
Determining Torque Loading and Actuator Sizing
Damper torque loadings, used in selecting the correct size actuator, should be
provided by the damper manufacturer. If this information is not available, the
following general selection guidelines can be used.
Damper Type Torque Loading
Opposed blade, without edge seals,
for non-tight close-off applications
3 in-lb/sq. ft.
Parallel blade, without edge seals,
for non-tight close-off applications
4 in-lb/sq. ft.
Opposed blade, with edge seals,
for tight close-off applications
5 in-lb/sq. ft.
Parallel blade, with edge seals,
for tight close-off applications
7 in-lb/sq. ft.
The above torque loadings will work for most applications under 2 in. w.g. static
pressure or 1000 FPM face velocity. For applications between this criteria and 3 in.
w.g. or 2500 FPM, the torque loading should be increased by a multiplier of 1.5. If
the application calls for higher criteria up to 4 in. w.g. or 3000 FPM, use a multiplier
of 2.0.
Torque Loading Chart
70
60
50
40
30
20
10
0
2
3
4 6 8 10
5 7 9
Damper Area
(s
q. ft.)
Torque Loading (in-lb/ sq. ft.)
General Information
Belimo actuators should be mounted indoors in a dry, relatively clean environment
free from corrosive fumes. If the actuator is to be mounted outdoors, a protective
enclosure must be used to shield the actuator.
For new construction work, order dampers with extended shafts. Instruct the
installing contractor to allow space for mounting and service of the Belimo actuator on
the shaft. The damper shaft must extend at least 3 1/2” from the duct. If the shaft
extends less than 3-1/2” or if an obstruction blocks access, the shaft can be extended
with the AV 10-18 shaft extension accessory or the actuator may be mounted in its short
shaft configuration.
Mechanical Operation
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 constant torque to the damper with, and without, power applied to
the actuator. The AF…-S versions are provided with 2 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 +5°, the
other switch function is adjustable between +25 to +85°.
Automatic Airtight Dampers/Manual Override
The AF series provides 95° of rotation and is provided with a graduated position
indicator showing 0° to 95°.
The AF has a unique manual positioning mechanism which allows the setting of any
damper position within its 95° of rotation. A pre-tensioned spring automatically
tightens damper when power is applied to the actuator, compensating for damper
seal deterioration.
The actuator is shipped at +5° (5° from full fail-safe) to provide automatic
compression against damper gaskets for tight shut-off. When power is applied, the
manual mechanism is released and the actuator drives toward the full fail-safe
position.
Standard Mounting
NOTE: The AF…series actuator is shipped with the manual override adjusted
for a +5° position at the universal clamp (not at full fail-safe, 0°). This allows
for automatic compression of damper blade seals when the actuator is in use,
providing tight shut-off. This assumes that the damper is to have tight shut-
off at the fail-safe position. If tight close-off is desired at the opposite
direction from fail-safe, the manual override should be released so the
actuator can go to the full fail-safe position. See the manual override
instructions.
1. Manually move the damper to the fail-safe position (usually closed). If the shaft
rotated counterclockwise ( ), this is a CCW installation. If the shaft rotated )
clockwise ( ), this is a CW installation. In a CCW installation, the actuator side )
marked “CCW” faces out, while in a CW installation, the side marked “CW” faces
out. All other steps are identical.
2. The actuator is usually shipped with the universal clamp mounted to the “CCW”
side of the actuator. To test for adequate shaft length, slide the actuator over the
shaft with the side marked “CCW” (or the “CW” side if this is the side with the
clamp). If the shaft extends at least 1/8” through the clamp, mount the actuator
as follows. If not, go to the Short Shaft Installation section.
n
3. If the clamp is not on the correct side as determined in step #1, re-mount the
clamp as follows. If it is on the correct side, proceed to step #5. Look at the
universal clamp. If you are mounting the actuator with the “CCW” side out,
position the clamp so that the pointer section of the tab is pointing to 0° (see
Figure C) and the spline pattern of the clamp mates with spline of the actuator.
Slip the clamp over the spline. (Use the same procedure if the “CW” side is out.) If
your application requires a mechanical minimum position, read the Rotation
Limiting, Mechanical Minimum Damper Position section.
n
4. Lock the clamp to the actuator using the retaining clip.
5. Verify that the damper is still in its full fail-safe position.
6. Slide the actuator over the shaft.
7. Position the actuator in the desired location.
8. Tighten the two nuts on the clamp using a 10mm wrench or socket using 6-8
ft-lb of torque.
9. Slip the stud of the anti rotation strap into the slot at the base of the actuator.
The stud should be positioned approximately 1/16 of an inch from the closed end
of the slot. Bend the strap as needed to reach the duct. Attach the strap to the
duct with #8 self tapping screws.
M40024 - 05/10 - Subject to change.
© Belimo
Aircontrols (USA),
Inc.