M9108 Series Proportional Electric Non-spring Return Actuators The
M9108-GGx-2 and M9108-HGx-2 Series direct-mount electric actuators
operate on 24 VAC or VDC power, and are available for use with
proportional controllers. These bidirectional actuators do not
require a damper linkage, and are easily installed on a damper with
a round shaft up to 3/4 in. (19 mm) in diameter or a square shaft
up to 5/8 in. (16 mm). They may be direct- or remote-mounted to a
damper. A single M9108-GGx-2 or M9108-HGx-2 model delivers up to 70
lb∙in (8 N∙m) of torque. The angle of rotation is mechanically
adjustable from 0 to 90° in 5-degree increments. Integral auxiliary
switches are available to indicate end-stop position or to perform
switching functions at any angle within the selected rotation
range. Jumpers on the actuator allow users to select the direction
of action, range of control input, and calibration (fixed or
adjustable). Position feedback is available through switches, a
potentiometer, or a 0 to 10 VDC signal. Figure 1: M9108 Series
Actuator Features and Benefits Two Control Inputs Meet the needs
of most applications Output Position Feedback Provides simple,
closed-loop control with accurate position sensing Electronic
Stall Detection Ensures higher reliability by deactivating the
actuator motor if a stall condition is detected Dual Scale (0 to
90° and 90 to 0°) on the Cover Indicates the position of the
actuator’s rotation in 10° increments Removable Coupler Allows
adjustment of the rotation range from 0 to 90° Steel U-bolt Clamp
Provides four-point damper shaft gripping Jumper-selectable
Rotation Direction and Manual Gear Release Simplifies installation,
setup, and field adjustments National Pipe Thread (NPT) Threaded
Housing Provides easy connection for electrical fittings 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
Brand | Johnson |
Color | blue |
Warranty | 1 year |