Belimo AF120 US Handmatig - Pagina 4

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Determining Torque Loading and Actuator Sizing

Damper torque loadings, used in selecting the correct size actua-

tor, should be provided by the damper manufacturer. If this

information is not available, the following general selection

guidelines can be used.

Damper Type

Opposed blade, without edge seals,

for non-tight close-off applications

Parallel blade, without edge seals,

for non-tight close-off applications

Opposed blade, with edge seals,

for tight close-off applications

Parallel blade, with edge seals,

for tight close-off applications

The above torque loadings will work for most applications under

2 in. w.g. static pressure or 1000 FPM face velocity. For appli-

cations 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.

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 crankarm and sever-

al 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 compres-

sion of damper blade seals when the actuator is in use, pro-

viding 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.

Torque Loading

3 in-lb/sq. ft.

4 in-lb/sq. ft.

5 in-lb/sq. ft.

7 in-lb/sq. ft.

1. Manually move the damper to the fail-safe position (usually

2. The actuator is usually shipped with the universal clamp

Installation Instructions

Torque Loading

Chart

closed). If the shaft rotated counterclockwise (

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 identi-

cal.

mounted to the "CCW" side of the actuator. To test for

Mechanical Installation

), this