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READ THIS INSTRUCTION SHEET AND THE SAFETY WARNINGS
CAREFULLY BEFORE INSTALLING AND SAVE IT FOR FUTURE USE
General Features
The Floating and ON/OFF Electric Spring Return Actuators are direct-mount, spring,
bidirectional actuators and do not require a damper linkage. The actuators are intended
to be installed on an air damper in HVAC Systems. The actuators operate on AC 24 V
power at 50/60 Hz, DC 24 V power or AC 230 V power at 50/60 Hz.
When the control signal is applied the actuator drives the damper to the operational
position, while evenly tensioning the integrated spring. After a power failure, the stored
energy in the spring immediately brings the damper to the safety position.
Figure 1:
Dimensions in mm
Figure 2:
Side A and B of actuator
Side A: CCW Spring Return Direction
Side B: CW Spring Return Direction
(a). Auxiliary switch adjuster
(b). Adapter for round shaft 8 to 16 mm or square shaft 6 to 12 mm
(c). Mode selector
(d). Manual Override
(e). Manual Override lock shaft
IMPORTANT: When calculating the torque required to operate dampers, it is essential
to take into account all the data supplied by the damper manufacturer.
Installation and adjustment
Figure 3:
Fitting the Anti-rotation Bracket on the Damper Frame or Duct
(a). M3 x 10 mm. Self - Drilling Sheet Metal Screw (Two Locations)
(b). Anti-rotation Bracket
(c). Damper Frame
Figure 4:
Changing the position of the coupler
(a). Coupler
(b). Locking clip
1. Remove the Locking Clip
2. Mount the coupler on either Side A or Side B of the actuator
3. Snap the locking clip into the coupler groove
Figure 5:
Allowed shaft length
Attach the actuator to the damper spindle by means of the adapter and secure the
Anti-rotation Bracket with the screws provided.
WARNING: Do not install or use this Electric Spring Return Actuator in or
near environments where corrosive substances or vapors could be
present. Exposure of the electric actuator to corrosive environments may
damage the internal components of the device, and will void the
warranty.
Figure 6:
Angle of rotation limiting
Using the M9208-603 the angle of rotation can be limited. The actuator is factory set for
95° rotation, and its range is limited in 5° increments to a minimum of 35°. Attaching the
stroke-limiting stop in the furthest mounting position reduces the rotation range of the
actuator by 5°. Each progressive position reduces the rotation range on additional 5°.
Selecting the direction of rotation
Note: For CCW spring return direction, mount the actuator to the damper shaft so that
Side A of the actuator is away from the damper as illustrated in Figure 2. To change the
spring return direction to CW, mount the actuator to the damper shaft so that Side B of
the actuator is away from the damper.
Wiring
WARNING: The electrical connections for the actuators must be
executed in accordance with the relevant legal requirements.
In order to avoid any personal injury or damage to the equipment or
other property, always isolate the power supply before commencing any
work on the electrical wiring. In order to avoid danger to property, it is
important for the equipment to be used solely for which it is intended.
Wiring Diagrams
WARNING: The integrated circuits in the actuator are sensitive to static
electricity. Take suitable precautions.
Figure 7:
M9208-AGx-1: Floating Control, Four wire
Figure 8:
M9208-AGx-1: Open / Close, Single Wire Control
Figure 9:
M9208-AGx-1: ON/OFF Control, Two Wire
Figure 10: M9208-BGx-1: ON/OFF Control
Figure 11: M9208-BDx-1: ON/OFF Control
Figure 12: Floating Control, Multiple Actuators with One Transformer
1
M9208-AGx-1 / M9208-Bxx-1
Setup and Adjustment
Auxiliary Switch
Figure 13: Auxiliary Switch (xxC Model only)
WARNING: Disconnect each of multiple power supplies before making
electrical connections. More than one disconnect may be required to
completely de-energize equipment. Contact with components carrying
hazardous voltage can cause electric shock and may result in severe
personal injury or death.
These models include two integral auxiliary switches, one fixed (S1) and one adjustable
(S2), with a switch adjuster accessible on either face of the actuator (as illustrated in
Figure 2). The nominal factory setting for S1 Auxiliary Switch is 11° closing, and the
nominal factory setting for S2 Auxiliary Switch is 81° opening (relative to a 0 to 90°
rotation range).
The switch point of S2 Auxiliary Switch is independently and continuously adjustable
from 20° to 85° (relative to a 0 to 90° rotation range).
Use the method in the following example for the most accurate positioning of S2
Auxiliary Switch.
1. Move the actuator to the full spring return position.
2. Rotate the switch adjuster until it points to the desired switch point.
3. Connect S2 Auxiliary Switch to a power source or an ohmmeter, and apply power to
the actuator. The actuator moves to the fully open position and holds while power is
applied.
4. Observe the switch point. If required, repeat Steps 2 and 3.
IMPORTANT: Use the Electric Spring Return Actuator only to control equipment under
normal operating conditions. Where failure or malfunction of the electric actuator could
lead to personal injury or property damage to the controlled equipment or other
property, additional precautions must be designed into the control system. Incorporate
and maintain other devices such as supervisory or alarm system or safety or limit
controls intended to warn of, or protect against, failure or malfunction on the electric
actuator.
Mode Selection Switch (M9208-AGx-1 model only)
Actuators have an external mode selection switch to reverse control logic. The switch is
accessible from both A and B sides of the actuator as illustrated in Figure 14.
Actuators are delivered in Direct Acting (DA) mode and can be switched by the user to
Reverse Acting (RA) mode.
Manual Override
Use only the supplied manual override crank to reposition the actuator hub when using
the manual override feature.
1. De-energize the actuator.
2. Insert the hex end of the manual override crank into the manual override adjustment
point on the face of the actuator.
3. Rotate the manual override crank in the direction indicated by the arrow on the label.
4. While holding the manual crank in the wound position, rotate and hold the red lock
shaft approximately 10° then release the manual crank to lock the actuator hub in
place.
Note: Insert and slightly rotate the manual crank in the direction indicated by the arrow
on the label to unlock the actuator hub. Alternately, the actuator hub automatically
unlocks when power is applied to the actuator, and returns the actuator to normal drive
and spring return operation.
IMPORTANT: Applying excessive torque to the manual override or running the
manual override with a power tool may damage the internal components of the
actuator and cause premature failure. At the end of travel, the rotational resistance
increases; do not force the actuator hub past this point.
Ordering Codes
Codes
Descriptions
M9208-BGA-1
8 Nm, 24 V AC/DC, ON/OFF
M9208-BGC-1
8 Nm, 24 V AC/DC, ON/OFF, 2 auxiliary switches
M9208-BDA-1
8 Nm, 230 V AC, ON/OFF
M9208-BDC-1
8 Nm, 230 V AC, ON/OFF, 2 auxiliary switches
M9208-AGA-1
8 Nm, 24 V AC/DC, ON/OFF and Floating Point
M9208-AGC-1
8 Nm, 24 V AC/DC, ON/OFF and Floating Point, 2 auxiliary switches
This document is subject to change without notice
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