Product Overview

M9208-xxx-x Series Electric Spring Return Actuators Product Bulletin 1
Refer to the QuickLIT Web site for the most up-to-date version of this document.
The M9208-xxx-x Series Electric Spring Return
Actuators provide control of dampers in Heating,
Ventilating, and Air Conditioning (HVAC) systems. All
actuators in this series provide 70 lb·in (8 N·m) rated
torque. A mechanical spring return system provides
rated torque with and without power applied to the
actuator. The series includes the following control
options:
• On/Off, 24 V, 120 VAC, 230 VAC power
• On/Off and Floating Point, 24 V power
• Proportional, 24 V power, for 0(2) to 10 VDC or
0(4) to 20 mA Control Signal
These actuators are configured for direct mounting and
do not require a damper linkage. Actuators can be
mounted directly to a damper shaft from 5/16 to 5/8 in.
(8 to 16 mm) diameter with a universal clamp. For
shafts up to 3/4 in. (19 mm) diameter use the
accessory Large Shaft Coupler Kit M9208-600. An
accessory crankarm and remote mounting kit are
available for applications where the actuator cannot be
direct-coupled to the damper shaft. Optional line
voltage auxiliary switches indicate an end-stop position
or perform switching functions within the selected
rotation range.
Figure 1: M9208-xxx-x Series Electric Spring
Return Actuator
Table 1: Features and Benefits (Part 1 of 2)
Features Benefits
70 lb·in (8 N·m) Rated Torque Provides high torque in a compact package size to expand the range of damper
applications in HVAC systems.
Direct-Coupled Design Requires no crankarm or linkage and is capable of direct mounting to a shaft up to
3/4 in. (19 mm) diameter and centered on a 1/2 in. (13 mm) shaft.
Reversible Mounting Provides either clockwise or counterclockwise operation.
Electronic Stall Detection Protects from overload at all angles of rotation. Power consumption is reduced in
holding mode. The actuator may be stalled anywhere in its rotation range without
the need for mechanical end switches.
Double-Insulated Construction Allows that electrical ground connection is not necessary for regulatory agency
compliance.
Microprocessor-controlled
Brushless DC Motor
(-AGx and -GGx types)
Provides constant runtime independent of torque.
External Mode Selection Switch
(-AGx and -GGx types)
Permits control logic reversal for Floating Control (-AGx types).
Permits calibration, input signal range selection, and control logic reversal for
Proportional Control (-GGx types).
M9208-xxx-x Series Electric Spring Return Actuators
Product Bulletin
M9208-GGx-x, M9208-AGx-x, M9208-Bxx-3
Code No. LIT-12011480
Issued February 1, 2013
Supersedes May 13, 2011