Specifications

OpenAir GMA Series Spring Return, 62 lb-in, Rotary, Electronic Damper Actuators Technical Instructions
Document Number 155-315P25
January 26, 2011
Siemens Industry, Inc. Page 9
Mounting and Installation
Flip the actuator to select either clockwise or counterclockwise fail-safe rotation of
the damper shaft. Follow steps 1, 2, and 3 of
Table 3 to determine the correct
actuator mounting orientation.
Table 3. Actuator Mounting Orientation and Damper Control.
Damper
Type
Power Fail
Spring Return
Position
Actuator
Mounting
Orientation
3
Close Open
Close Open
2
1
Determining the Actuator
Mounting Orientation
EA1055R1
MANUAL
OVERRIDE
MANUAL
OVERRIDE
MANUAL
OVERRIDE
MANUAL
OVERRIDE
Close Open CloseOpen
GMA12x
GMA22x
2-Position
Power On
EA1056R1
Y2
Close Open
Close Open
Close Open CloseOpen
GMA13x
3-Position
Y1
Y2
Y1
EA1057R1
Close Open Close Open
Close Open CloseOpen
GMA15x
GMA16x
GMA15x
GMA16x
Modulating Control
Y = 10V
Y = 10V
Y = 2V
Y = 2V
Y = 10V
(or Y = Uo + ΔU)
Y = 0V
(or Y = Uo)
EA1058R1
• The shaft adapter and the position indicator can be mounted on either side of the actuator. The actuator
mounting orientation and shaft length determine how they will be mounted on the actuator.
• The minimum damper drive shaft length is 3/4-inch (20 mm).
• See Specifications for the minimum and maximum damper shaft dimensions.
• The actuator is shipped from the factory with a 5° preload enabling tight close off of the damper in power-fail-
close applications.
• A mounting bracket is included with the actuator.
• The shaft adapter and mounting parts are shipped in a separate container with the actuator.
• See the detailed mounting instructions included with each actuator.