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I20683 - Subject to change.
TAF
Installation Instructions
Mechanical Installation
Standard Mounting
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
several mounting brackets are available for applications where the actuator cannot be direct coupled to the damper shaft. The TAF
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 TAF…-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 b25° to +85°.
Automatic Airtight Dampers/Manual Override
The TAF series provides 95° of rotation and is provided with a graduated position indicator showing 0° to 95°. The TAF 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.
Note:The TAF…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
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.
General Information
Trane 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 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.
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