Product Overview

M9208-xxx-x Series Electric Spring Return Actuators Product Bulletin 3
M9208-Bxx-3 Series On/Off Actuators
For on/off control of dampers requiring up to 70 lb·in.
(8 N·m) in HVAC systems. On/off control can be
provided from a manual switch, controller, auxiliary
switch from a fan motor contactor, or similar device.
Operation
M9208-xxx-x Series actuators provide 95º of rotation. A
graduated scale from -5º to 90º and a position indicator
provide visual indication of stroke. A manual override
allows manual positioning and temporary locking of the
actuator output hub. Restoring power and control
signal to the actuator automatically releases the
manual override the first time the actuator is
commanded to advance past the locked position.
During installation, the installer can advance the spring
and mount the actuator to provide positive close-off on
air-tight damper applications. When power fails during
service, the mechanical spring return system provides
rated torque to the connected equipment, returning it to
the home position.
M9208-GGx-x Series Proportional Actuators
The M9208-GGx-x Series uses a brushless DC motor
controlled by a microprocessor. The microprocessor
drives the motor at constant speed, independent of
torque. The microprocessor also monitors the
brushless DC motor’s rotation to prevent damage to
the actuator in a stall condition. The actuator can be
stalled anywhere within its rotation range without the
need for mechanical end switches. Power consumption
is reduced in the holding mode.
The M9208-GGC-3 version is provided with two
integrated, line-voltage-capable auxiliary SPDT
switches. The Switch S1 switch point is fixed at 11º
closing, while the Switch S2 switch point is
independently and continuously adjustable from 25º to
90º. Auxiliary switches are double-insulated so an
electrical ground is not required.
M9208-AGx-x Series On/Off and Floating Point
Actuators
The M9208-AGx-x Series uses a brushless DC motor
controlled by a microprocessor. The microprocessor
drives the motor at constant speed, independent of
torque. The microprocessor also monitors the
brushless DC motor's rotation to prevent damage to the
actuator in a stall condition. The actuator can be stalled
anywhere within its rotation range without the need for
mechanical end switches. Power consumption is
reduced in the holding mode.
The M9208-AGC-3 version is provided with two
integrated, line-voltage-capable auxiliary SPDT
switches. The Switch S1 switch point is fixed at 11º
closing, while the Switch S2 switch point is
independently and continuously adjustable from 25º to
90º. Auxiliary switches are double-insulated so an
electrical ground is not required.
M9208-Bxx-3 Series On/Off Actuators
The M9208-Bxx-3 Series uses a DC brush motor
controlled by analog electronics. The actuator can be
stalled anywhere within its rotation range without the
need for mechanical end switches. Power consumption
is reduced in the holding mode. Three different voltage
ratings are available for On/Off Actuators.
• M9208-BGx-3: AC 24 V 50/60 Hz or
DC 24 V power
• M9208-BAx-3: AC 120 V 50/60 Hz power
• M9208-BDx-3: AC 230 V 50/60 Hz power
The M9208-BAx-3 and M9208-BDx-3 actuators are
double-insulated so an electrical ground is not
required.
The M9208-BxC-3 versions are provided with two
integrated, line-voltage-capable auxiliary SPDT
switches. The Switch S1 switch point is fixed at 11º
closing, while the Switch S2 switch point is
independently and continuously adjustable from 25º to
90º. Auxiliary switches are double-insulated so an
electrical ground is not required.