user manual

85
S20 Series (MS4120; MS7520; MS8120)
MS4120, MS7520, MS8120 Spring
Return Direct Coupled Actuators (DCA)
are used within heating, ventilating, and
air-conditioning (HVAC) systems. They
can drive a variety of quarter-turn, final
control elements requiring spring return
fail-safe operation.
SPECIFICATIONS
Actuator Type ....................................... Damper, Valve
Rotational Stroke .................................. 95 ±3 degrees
Fail Safe Mode ..................................... Spring Return
Rated Torque ........................................ 175 lb-in. (20 Nm)
External Auxiliary Switches Available .. Yes, SW2-US
Electrical Connections ......................... Enclosed screw terminal strip
(22 to 14 AWG)
Environmental Rating ........................... NEMA2
Frequency ............................................ 60 Hz
Manual operation ................................. Manual crank
Mounting .............................................. Direct Coupled
Maximum Noise Rating,
Holding (dBA @ 1m) ............................ 20 (no audible noise)
Maximum Noise Rating,
Driving (dBA @ 1m) .............................. 40
Timing, Nominal Driving at 60 Hz ......... 45 sec. or 90 sec.
Power Consumption, Driving ................ 16 VA, 40 VA, or 60 VA
Rotational Stroke Adjustment ............... Mechanically limited 5 degree
increments
Compatible Damper Shafts .................. 3/8 to 1.06 round or 3/8 to
11/16 square
(10 to 27 round or 10 to 18
square)
Shaft Adapter Type .............................. Self-centering clamping
Supply Voltage ..................................... 100 to 250 Vac
Materials ............................................... Aluminum housing, Plenum
rated plastic access cover
Operating Humidity Range (% RH) ...... 5 to 95% RH, non-condensing
Ambient Temperature Range ............... -40 F to 140 F (-40 C to 60 C)
Storage Temperature Range ................ -40 F to 158 F (-40 C to 70 C)
Weight .................................................. 6 lb (2.72 kg)
Includes ................................................ Mounting bracket, self-
centering shaft adapter, 3mm
crank
Comments ............................................ Integral 1/2 in. NPSM conduit
connection.
APPROVALS
CE ......................................................... 89/336/ECC, 73/23/EEC
C-Tick ................................................... N314
Underwriters Laboratories, Inc. ............ UL873, Plenum Rated
Canadian Underwriters
Laboratories, Inc. ................................. cUL C22.2 No. 24-93
FEATURES
• Brushless DC sub-motor with electronic stall protection for
floating/modulating models.
• Brush DC sub-motor with electronic stall protection for
2-position models.
• Self-centering shaft adapter (shaft coupling) for wide range
of shaft sizes.
• Models available for use with two-position, single pole
single throw (SPST), line- (Series 40) or low- (Series 80)
voltage controls.
• Models available for use with floating or switched single-
pole, double-throw (SPDT) (Series 60) controls.
• Models available for use with proportional current or voltage
(Series 70) controls.
• Models available with combined floating/modulating control
in a single device.
• Models available with adjustable zero and span.
• Models available with line-voltage internal end switches.
• Access cover to facilitate connectivity.
• Metal housing with built-in mechanical end limits.
• Spring return direction field-selectable.
• Shaft position indicator and scale.
• Manual winding capability with locking function.
• UL (cUL) listed and CE compliant.
• All models are plenum-rated per UL873.
DIMENSIONS DIAGRAMS
9-3/4
(247)
1-9/16
(40)
6-1/8
(156)
1-9/16
(40)
1-9/16
(40)
3-15/16 (100)
2-15/16 (75)
1/4 (6)
M20952
Spring Return Direct Coupled Actuator
S20 Series (MS4120; MS7520; MS8120)
SUBMITTAL SHEETS