88 AND 175 LB-IN (10 AND 20 NM) SPRING RETURN DIRECT COUPLED
ACTUATORS
PRODUCT DATA
FEATURES
• Brushless DC submotor with electronic stall
protection for floating/modulating models.
• Floating/Modulating models can provide twoposition (SPST) control.
• Brush DC submotor with electronic stall protection
for two-position models.
• Self-centering shaft adapter (shaft coupling) for
wide range of shaft sizes.
• 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.
• All Models are plenum-rated per UL2043.
APPLICATION
MS31XX, MS41XX, MS71XX, MS75XX, MS81XX 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.
• Models available with 3-foot, 18 AWG color-coded
cable.
• Sylk-enabled models available.
• Features shown in Table 1.
Applications include:
• Volume control dampers, mounted directly to the drive
shaft or remotely (with the use of accessory hardware).
• Quarter-turn rotary valves, such as ball or butterfly
valves mounted directly to the drive shaft.
• Linear stroke globe or cage valves mounted with
linkages to provide linear actuation.
Round Damper Shafts: 0.375 to 1.06 in. (10 to 27 mm).
Square Damper Shafts: 1/2 to 3/4 in. (13 to 19 mm).
Actuator can be mounted with shaft in any position.
NOTE: For 175 lb-in. (20 Nm) models: 3/4 in. or greater
shaft diameter recommended.
Minimum Damper Shaft Length: 1 in. (25 mm); 3 in.
(76 mm) recommended.
Cable Specification:
300 V, 75° C, Plenum Rated, 3 ft length from end of access
cover, 18 AWG
Timing (At Rated Torque and Voltage):
9-3/4
(247)
1-9/16
(40)
2-1/2
(64)
MIN.
3 (76)
MIN.
3 (76)
MIN.
FROM
SHAFT
END
6-1/8
(156)
1-9/16
(40)
1-9/16
(40)
3-15/16 (100)
2-15/16 (75)
1/4 (6)
M28939
144 (3658)
1
1
CABLE AND STRAIN RELIEF
ON SELECT MODELS ONLY.
Table 2. Model Selection.
a
Model manufactured for sale in the United States.
b
Model manufactured for sale in Europe.
c
Cables available on 75 and 81 Series only.
M Electrical Motor
S Fail Safe Function (Spring Return)
31 24 Vac communicating (Sylk Enabled)
41 120 Vac Two-Position Control; Reversible Mount
71 24 Vac Modulating Control; Reversible Mount
75 24 Vac Modulating and Floating Control; Reversible Mount
81 24 Vac Two-Position Control; Reversible Mount
10 88 lb-in. (10 Nm)
20 175 lb-in. (20 Nm)
A
a
Standard U.S. Model
B
b
Standard European Model
E
b
Selectable control signal; Adjustable zero and span;
Includes service and auto-adapt modes
with actuator).
50001194-001 Foot Mount Kit.
50005859-001 NEMA4/4X Enclosure.
50006427-001 Anti-Rotation Bracket (supplied with actu-
ator).
SW2-US Auxiliary Switch Package.
See also Form 63-2620.
Sylk™ Bus:
Sylk is a two-wire, polarity insensitive bus that provides
communications between a Sylk-enabled actuator and a
Sylk-enabled controller. For wiring, the Sylk-enabled
actuator may be mounted up to 200 ft. (61m) from the
controller; twisted pair wire is recommended for wire
runs longer than 100 ft. (30.5m). Using Sylk-enabled
actuators saves I/O on the controller and is faster and
cheaper to install since the bus is polarity insensitive.
Sizing
Required Torque
In lieu of data from a Specification Engineer or
Manufacturer, required torque for a given damper load can
be determined using the following method:
Where:
—T
= Required torque for the damper load.
R
—T
= Damper torque rating from the manufacturer,
D
expressed in either (lb-in.)/(sq ft) or (Nm)/(sq m). the
damper load.
—A
= Damper area expressed in either sq ft or sq m.
D
Actuators Required
In lieu of data from a Specification Engineer or
Manufacturer, the number of required actuators for a given
damper load can be determined using the following
method:
Where:
— N = Number of actuators.
—T
= Required torque for the damper load. (See above.)
R
—T
= Actuator torque rating.
A
— SF = Safety factor.
NOTE: The safety factor accounts for variables such as
misalignments, aging of the damper, etc. 0.8 is a
typical safety factor.
63-2607—264
INSTALLATION
CAUTION
CAUTION
CAUTION
MSXX10, MSXX20 SERIES
When Installing this Product...
1. Read these instructions carefully. Failure to follow
them could damage the product or cause a hazardous condition.
2. Check the ratings given in the instructions and on the
product to make sure the product is suitable for your
application.
3. Installer must be a trained, experienced service
technician.
4. After installation is complete, check out product
operation as provided in these instructions.
Electrical Shock or Equipment Damage Hazard.
Low voltage can shock individuals or short
equipment circuitry.
Disconnect power supply before installation.
IMPORTANT
All wiring must agree with applicable codes,
ordinances and regulations.
Location
These actuators are designed to mount directly to a
damper external drive shaft. The shaft coupling fastens to
the drive shaft. The actuator housing includes slots which,
along with an anti-rotation bracket, secure the actuator to
the damper frame or duct work (see Fig. 9).
Determine Appropriate Mounting
Orientation
The actuators are designed to open a damper by driving
the damper shaft in either a clockwise or
counterclockwise direction (see Fig. 2).
NOTES:
—Actuators are shipped in the fully closed (spring
return) position.
—An arrow molded into the hub points to tick
marks on the label to indicate the hub rotary
position.
CCW TO CLOSE
(FAIL-SAFE
POSITION)
CW TO OPEN
Fig. 2. Spring Return DCA mounting orientation.
CW TO CLOSE
(FAIL-SAFE
POSITION)
CCW TO OPEN
M20953
NOTES:
—When mounted correctly, these slots allow the
actuator to float without rotating relative to the
damper shaft.
—Using other brackets or linkages, the actuator
can be foot-mounted or tandem-mounted.
Motor Damage Hazard.
Deteriorating vapors and acid fumes can damage
metal parts.
Install motor in areas free of acid fumes and other
deteriorating vapors.
Equipment Damage Hazard.
Tightly securing actuator to damper housing can
damage actuator.
Mount actuator to allow it to float along its vertical
axis.
Preparation
Before mounting the actuator onto the damper shaft,
determine the:
— Damper/valve opening direction for correct spring
return rotation. The actuator can be mounted to provide
clockwise or counterclockwise spring return.
— Damper shaft size (see the Specifications section).
Measure Damper/Valve Shaft Length
If the shaft is less than three inches in length, the shaft
coupling must be located between the damper/valve and
actuator housing. If the shaft length is more than three
inches, the shaft coupling may be located on either side of
the actuator housing.
If the coupling must be moved from one side of the
actuator to the reverse, follow these instructions (see
Fig. 3):
1. Remove the retainer clip from the shaft coupling and
set it aside for later use.
2. Remove shaft coupling from one side of the actuator.
3. Replace the shaft coupling on the opposite side of
the actuator aligning it based on the stroke labelling.
4. Replace the retainer clip on the shaft coupling using
the groove of the coupling.
M19579
Fig. 3. Mounting shaft coupling to actuator opposite
side.
563-2607—26
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