Honeywell MS 10 Series

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PRODUCT DATA

63-2607-26

MSXX10, MSXX20 Series

88 AND 175 LB-IN (10 AND 20 NM) SPRING RETURN DIRECT COUPLED

ACTUATORS

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.

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.

FEATURES

• Brushless DC submotor with electronic stall

protection for floating/modulating models.

• Floating/Modulating models can provide two-

position (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.

• Models available with 3-foot, 18 AWG color-coded

cable.

• Sylk-enabled models available.

• Features shown in Table 1.

Contents

Application ..................................................................................... 1

Features .......................................................................................... 1

Specifications ............................................................................... 2

Wiring .............................................................................................. 8

Operation ....................................................................................... 15

Checkout ........................................................................................ 16

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features
Important Notes for Usage and Installation

The Honeywell MSXX10 and MSXX20 Series are spring return direct coupled actuators designed for use in heating, ventilating, and air-conditioning (HVAC) systems. These actuators are capable of driving a variety of quarter-turn, final control elements that require spring return fail-safe operation, such as volume control dampers (mounted directly to the drive shaft or remotely with accessory hardware), quarter-turn rotary valves (like ball or butterfly valves), and linear stroke globe or cage valves (with linkages for linear actuation).

Function Description:

These actuators are designed to operate valves, dampers, ventilation flaps, and louvers, providing torque up to their rated capacity. In the event of a power failure, the actuator will spring return to its start position, ensuring fail-safe operation. They can be operated by proportional controllers, driving towards a fully open position as the input signal increases and towards a fully closed position as it decreases. The actuator stops when the input signal reaches the desired proportional control point. Some models are Sylk-enabled, allowing for communication within a Sylk-enabled actuator and controller network.

Important Technical Specifications:

Torque: Available in 88 lb-in (10 Nm) for MSXX10 models and 175 lb-in (20 Nm) for MSXX20 models.
Power Supply: Models support 24 Vac/dc (Class 2), 100-250 Vac, with varying VA driving requirements depending on the model and torque.
Drive Time: Typically 90 seconds for floating/modulating models and 40 seconds (±10 seconds) for two-position models. Spring close time is less than 25 seconds.
Device Weight: 6 lb (2.7 kg).
Temperature Ratings:
- Ambient: -40°F to 140°F (-40°C to 60°C).
- Shipping and Storage: -40°F to 158°F (-40°C to 70°C).
Humidity Ratings: 5% to 95% RH noncondensing.
Stroke: 95° ±3°, mechanically limited.
End Switches (Two SPDT): Dry contact with fixed settings at 7° nominal stroke and 85° nominal stroke. Maximum load is 250 Vac, 5A resistive.
Mounting: Self-centering shaft adapter (shaft coupling) compatible with round damper shafts from 0.375 to 1.06 in. (10 to 27 mm) and square damper shafts from 1/2 to 3/4 in. (13 to 19 mm). The actuator can be mounted with the shaft in any position. For 175 lb-in. (20 Nm) models, a 3/4 in. or greater shaft diameter is recommended.
Minimum Damper Shaft Length: 1 in. (25 mm); 3 in. (76 mm) recommended.
Electrical Connections: Field wiring 14 to 22 AWG (2.0 to 0.344 mm sq) to screw terminals under a removable access cover.
Cable Specification: 300 V, 75° C, Plenum Rated, 3 ft length from end of access cover, 18 AWG (for models with whips).
Approvals: UL (cUL) listed, plenum-rated per UL2043.

Usage Features:

Control Signal Selection: Standard models include a mode selection dial for desired input signals. Enhanced models offer additional dials for adjusting input signal zero and span. Sylk-enabled MS31XX models feature Sylk address selection and Range/Direct control selector pots.
Spring Return Direction: Field-selectable, allowing for clockwise or counterclockwise spring return.
Shaft Position Indicator and Scale: Provides visual indication of the actuator's position.
Manual Winding Capability: Includes a locking function for manual positioning without power, useful during installation or for moving and locking the damper/valve shaft.
Mechanical End Limits: Built-in to prevent over-travel.
Adjustable Zero and Span (Enhanced Modulating Models): Allows for fine-tuning of the actuator's response to input signals, defining the 0% angle of rotation and adjusting the motor response over the selected input span.
Auto-Adapt Feature: For mechanically limited strokes, this feature rescales the input signal over the new limited stroke, ensuring full control across the reduced travel span.
Actuator Override: Allows for overriding the control signal (e.g., for freeze protection) to force the actuator to a full open or full closed position by manipulating the input signal connection.
Non-Standard Stroke (Mechanical Stroke Limit Reduction): The stroke can be adjusted in 5-degree increments by changing the rotational mounting of the shaft coupling, allowing the actuator to drive less than the full 95 degrees.

Maintenance Features:

Access Cover: Removable to facilitate connectivity and wiring to screw terminals.
Brushless DC Submotor: For floating/modulating models, with electronic stall protection.
Brush DC Submotor: For two-position models, with electronic stall protection.
Self-Centering Shaft Adapter: Simplifies installation and accommodates a wide range of shaft sizes.
Metal Housing: Durable construction for longevity.

Important Notes for Usage and Installation:

Always read instructions carefully to avoid product damage or hazardous conditions.
Verify product suitability for the application by checking ratings.
Installation should be performed by a trained, experienced service technician.
Disconnect power supply before installation to prevent electrical shock or equipment damage.
All wiring must comply with local electrical codes, ordinances, and regulations.
Avoid using the actuator as a shaft bearing to prevent damage; it should only supply rotational torque.
Do not turn the motor shaft by hand or with a wrench, as this can damage the gear train.
Install the motor in areas free of acid fumes and deteriorating vapors to prevent damage to metal parts.
Ensure the mounting assembly prevents actuator rotation and allows it to float along its vertical axis; overtightening can cause binding and reduce torque output.
The actuator is designed to respond to DDC Controller instantaneous contact closures; avoid short cycling the actuator, as unstable damper control can cause premature actuator failure.