Product Overview
2 M9108-AGx-2 Series On/Off and Floating Electric Non-spring Return Actuators Submittal Bulletin
Application
IMPORTANT: This device is not designed or
intended to be used in or near environments where
explosive vapors or gases could be present, or
environments where substances corrosive to the
device’s internal components could be present.
The M9108-AGx-2 actuators may be mounted in any
convenient orientation. They are designed to position
air dampers and valves in Heating, Ventilating, and
Air Conditioning (HVAC) systems. Applications
include:
• positioning return air or exhaust dampers
• controlling face and bypass dampers
• positioning blades for variable volume fans
Refer to the manufacturer’s information to properly
size the damper, valve, and/or actuator. Spring return
actuators, such as Johnson Controls® M9206 and
M9216 Series, are recommended for use with outdoor
air dampers in cold climates.
Operation
IMPORTANT: The M9108-AGx-2 Series actuators
are intended to control equipment under normal
operating conditions. Where failure or malfunction of
an M9108-AGx-2 actuator could lead to an abnormal
operating condition that could cause personal injury
or damage to the equipment or other property, other
devices (limit or safety controls), or systems (alarm
or supervisory) intended to warn of, or protect
against, failure or malfunction of the M9108-AGx-2
actuator must be incorporated into and maintained
as part of the control system.
M9108-AGx-2 actuators operate on 24 VAC at
50/60 Hz or 24 VDC. These compact actuators use a
DC motor with stall detection circuitry that operates
throughout the entire stroke.
Rotation is mechanically limited to 93° by integral
end-stops. The position of the actuator is marked from
0 to 90° on the cover. An anti-rotation bracket prevents
lateral movement of the actuator. Press the
spring-loaded gear release on the actuator cover to
disengage the gear train for manual repositioning of
the coupler.
Dimensions
See Figure 2 for actuator dimensions.
2.54
64.5
9
0
6
0
0
3
0
Conduit Plug Centers
7.09
180
1.73
44
Anti-rotation Bracket
Dimensions
0
3
0
6
0
9
0
Shaft
Dimensions
Shaft
Dimensions
3.94
100
4.92
125
0.37 to 0.8
10 to 20
27
1.38
35
5.43
138
5.75
146
4.88
124
3.13
79
2.13
54
1.88
48
1.38
35
1.22
0.37 to 0.63
10 to 16
1.04
Cover
Removal
Figure 2: Actuator and Anti-Rotation Bracket Dimensions, in. (mm)