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ML4115; ML8115
Spring return direct coupled
actuators (DCA) for on/off damper
control with an integral junction box.
The actuator accepts an on/off
signal from a single-pole, single-
throw (SPST) controller. They are
designed to operate reliably in
smoke control systems requiring
Underwriter's Laboratories Inc.
UL555S ratings up to 350 F.
SPECIFICATIONS
Actuator Type .......................................Damper
Rotational Stroke .................................. 95 ±3 degrees
Fail Safe Mode .....................................Spring Return
Rated Torque ........................................ 30 lb-in. (3.4 Nm)
Maximum Stall Torque ..........................150 lb-in. (17 Nm)
Minimum Driving Torque at 350 F ........ 30 lb-in. (3.4 Nm)
Spring Return Torque ........................... 30 lb-in. (3.4 Nm)
External Auxiliary Switches Available ..Yes, 32003532-005
Electrical Connections .........................Two color-coded leads
Electrical Connection Length ............... 16 in. (406 mm)
Environmental Rating ........................... NEMA1
Frequency ............................................ 60 Hz
Mounting ..............................................Direct Coupled
Maximum Noise Rating,
Holding (dBA @ 1m) ............................20 (no audible noise)
Maximum Noise Rating,
Driving (dBA @ 1m) ..............................65
Compatible Damper Shafts .................. 3/8 to 1/2 in. square or round
(10 to 13 square/round)
Shaft Adapter Type ..............................Aluminum Hub, two set screws
Supply Voltage ..................................... 120 Vac ±10%
Materials ............................................... Aluminum housing
Operating Humidity Range (% RH) ......5 to 95% RH, non-condensing
Ambient Temperature Range ............... 0 F to +30 F (-18 C to 55 C)
Storage Temperature Range ................ -40 F to 140 F (-40 C to 60 C)
Weight .................................................. 6 lb (2.72 kg)
Includes ...............................................Ground Screw
Comments ............................................ Integral junction box with three
7/8 in. conduit openings
(fittings not included)
APPROVALS
Underwriters Laboratories, Inc. ........... UL873, Plenum Rated
Canadian Underwriters Laboratories, Inc. cUL C22.2 No. 24-93
FEATURES
• Integral spring return.
• No audible noise during holding.
• Electronic circuitry provides efficient operation while
eliminating the need for limit switches.
• Ninety-five degree angle of rotation for tight damper
closure.
• Die-cast aluminum housing.
• Housing design allows flush mounting to damper.
• Integral junction box with three conduit openings eliminates
need for separate wiring box.
• Mounts to 3/8 or 1/2 in. round or square shaft.
• High-temperature indicator included.
DIMENSIONS DIAGRAMS
2 (51)
1 (25)
5/8
(17)
6 3/8
(161)
7 1/2
(192)
4 (102)
7/8 (22)
5 1/8 (129)
2 (51) 3 5/16 (84)
1/16 (2)
M13053A
ML4115/ML8115 HAVE SMALLER
HUB WITH TWO SET SCREWS.
ML4105/ML8105 HAVE LONGER
HUB WITH FOUR SET SCREWS.
1
1
Fire And Smoke Actuator
ML4115; ML8115