Submittal Sheet

2 M9108 Series Proportional 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 proportional 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 Series proportional
actuators are intended to control equipment under
normal operating conditions. Where failure or
malfunction of an M9108 proportional 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 actuator must be incorporated into and
maintained as part of the control system.
M9108 proportional 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. The M9108 proportional
actuators employ noise-filtering techniques on the
control signal to eliminate repositioning due to line
noise.
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)