VRN PRESSURE INDEPENDENT CONTROL VALVES AND ACTUATORS
38-00032—01 10
Spring Return Direct Coupled
Actuator
APPLICATION
MS4105, MS7405, MS7505, and MS8105 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.
FEATURES
• Brushless DC submotor with electronic stall
protection on all models
• Self-centering shaft adaptor (shaft coupling) for wide
range of shaft sizes
• Access cover includes enclosed screw terminal strip
(22 to 14 AWG) for electrical connections.
• Models available with 3 foot 18 AWG color-coded
cable
• Durable plastic housing with built-in mechanical end
limits
• Spring return direction field selectable
• Shaft position indicator and scale
• UL (cUL) listed and CE compliant
• All models are plenum rated per UL873
SPECIFICATIONS
Actuator Type: Damper; Valve
Rotational Stroke: 95 ±3 degrees
Fail Safe Mode: Spring Return
Torque: 44 lb-in. (5 Nm)
Spring Return Torque: 44 lb-in. (5 Nm)
Spring Return Direction: By orientation
External Auxiliary Switches Available: No
Environmental Rating: NEMA2
Frequency: 50 Hz; 60 Hz
Mounting: Direct Coupled
Maximum Noise Rating, Holding (dBA @ 1m):
20 (no audible noise)
Maximum Noise Rating, Driving (dBA @ 1m): 50
Rotation to Open: By switch
Rotational Stroke Adjustment:
Mechanically limited 5 degree increments
Compatible Damper Shafts:
1/4 to 1/2 in. square or 3/8 to 5/8 in. round
(6 to 13 mm square or 9 to 16 mm round)
Shaft Adapter Type: Self-centering clamping
Materials: Plenum rated plastic housing
Supply Voltage: 24 Vac +20%, -15%, 24 Vdc
Power Consumption: 5 VA
Operating Humidity Range (% RH):
5 to 95% RH, non-condensing
Ambient Temperature Range: -40°F to +149°F
(-40°C to +65°C) for two-position actuators only
Storage Temperature Range:
-40°F to +150°F (-40°C to +65°C)
Weight: 3.5 lb. (1.6 kg)
Includes: Mounting bracket, self-centering shaft adapter
Approvals:
CE: EMC 2004/108/EC; Certification Low Voltage
Directive 2006/95/EC; IEC 60730-1 and Part 2-14
C-Tick: N314
Underwriters Laboratories, Inc.: UL873
Canadian Underwriters Laboratories, Inc.:
cUL C22.2 No. 24-93
Fig. 5. Spring return direct coupled actuator
dimensions in inches (mm).
M27712A
3-55/64 (98)
6-61/64
(177)
1-1/8
(29)
5-27/32
(148)
1-9/16
(40)
3-5/32 (80)
4-9/16
(116)
1-15/16
(49)
1-1/16
(27)
2-1/64
(55)
47/64
(19)
2-27/64 (61)
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