Honeywell ML4105, Product Data

PRODUCT DATA

® U.S. Registered Trademark
Copyright © 2003 Honeywell International Inc.
 All Rights Reserved 

N314

63-2540-9

ML4105, ML4115, ML8105, ML8115

Fast-Acting, Two-Position Actuators

FOR FIRE/SMOKE CONTROL APPLICATIONS

APPLICATION

The ML4105, ML4115, ML8105, and ML8115 Fast-Acting, 

Two-Position Actuators are spring return direct coupled 

actuators (DCA) with an integral junction box for on/off 

damper control. The actuator accepts an on/off signal from a 

single-pole, single-throw (spst) controller. Models are 

available with clockwise (cw) or counterclockwise (ccw) spring 

return and are designed to operate reliably in smoke control 

systems requiring Underwriter’s Laboratories Inc. UL555S 

ratings up to 350°F.

FEATURES

• 30 lb-in. (3.4 N•m) or 50 lb-in. (5.7 N•m) minimum 

driving torque at 350°F (176°C).

• Integral spring return ensures level of return torque.
• Fifteen-second spring return timing.
• No special cycling required during long-term holding. 

(See Operation section.)

• No audible noise during holding.
• Patent pending design eliminates need for limit 

switches to reduce power consumption.

• Models available for 24, 120, and 230 Vac.
• Ninety-five degree angle of rotation.
• Actuator holds rated torque at reduced power level.
• Die-cast aluminum housing.
• Housing design allows flush mounting to damper.
• Integral junction box with three conduit openings 

eliminates need for separate wiring box.

• High-temperature indicator included.

APPLICABLE LITERATURE

— Motor/Actuator Selection Guide 

for Damper Applications

63-8419

— Engineering Manual of Automatic Control

(also called The Gray Manual)

77-1100

— Direct Coupled Actuator 

Quick Selection Guide

63-8553

— Damper Torque Calculator

63-8437

Contents

Application ........................................................................

1

Features ...........................................................................

1

Applicable Literature .........................................................

1

Specifications ...................................................................

2

Ordering Information  ........................................................

2

Installation ........................................................................

4

Operation ..........................................................................

6

Checkout ..........................................................................

6