Product Overview

ManualsBrandsBarber Colman ManualsDampersTwo-Position Actuator w/ 220 lb-in torque (120V)

Applications

For two-position operation of dampers or valves in

heating, ventilating and air-conditioning systems and

similar applications where return to normal position is

not required.

These unidirectional actuators (clockwise rotation)

require a three-wire control circuit; SPDT snap-acting

switch or its equivalent such as a thermostat, pressure

switch or relay. A built-in cam operated, snap-acting,

adjustable SPDT auxiliary switch is standard. It is

factory set to make at mid-stroke. One contact closes

at end of stroke; other contact closes at end of next

stroke.

Features

• 24, 120, and 240 Vac models

• Equipped with SPDT auxiliary switch

• Actuator has a rugged die cast aluminum housing

with two 1/2” conduit openings

• Hazardous location actuator housing has two 3/4"

pipe taped openings for rigid metal conduit

connection

• Oil immersed gear train

• Requires a three wire control circuit SPDT

snap-acting or equivalent

Options

Available 24, 120, 208, 240 Vac; 50 or 60 Hz. 50 Hz

specify MC5-xxx. For hazardous locations, specify

MC6-xxx (60 Hz), MC7-xxx (50 Hz). Actuators factory

assembled, UL listed, CSA certified.

Applicable Literature

•

AV-390 Series, Valve Linkage for Gear Train

Actuators, General Instructions,

F-24376

•

TAC Electric/Electronic Products Catalog,

F-27382

•

Apparatus for Hazardous Locations EN-56-2

F-18451

•

AV-29x Series Hazardous Location Valve Linkage

for Geartrain Actuators General Instructions

F-27441

MC-351, 421, 431, MC-4311

Three-Wire, Two Position Actuators

General Instructions

MC6-3xx, MC6-4xx, MC7-4xx,

(Hazardous Location Actuator)

MC-xxx

(Standard Actuator)

Summary of content (12 pages)

PAGE 1
MC-351, 421, 431, MC-4311 Three-Wire, Two Position Actuators General Instructions Applications For two-position operation of dampers or valves in heating, ventilating and air-conditioning systems and similar applications where return to normal position is not required. These unidirectional actuators (clockwise rotation) require a three-wire control circuit; SPDT snap-acting switch or its equivalent such as a thermostat, pressure switch or relay.
PAGE 2
SPECIFICATIIONS Control Circuit: Three Wire SPDT snap-acting switch or equivalent. Shaft Rotation: Unidirectional clockwise 180° when power is applied. Auxiliary Switch: Adjustable SPDT is standard. Factory set to make (or break) at mid stroke. Running , 5.8A at 120 Vac, 2.9 at 240 Vac Locked Rotor: 34.8 at 120 Vac, 17.4 at 240 Vac Non-inductive, 12A at 120 Vac, 6 at 240 Vac. Environment: Ambient temperature limits: Shipping and storage -40 to 136 °F (-40 to 58 °C) Operating -40 to 136 °F (-40 to 58 °C).
PAGE 3
Miscellaneous Actuator Accessories Standard models only. AM-321 AM-341 AM-363 Two step switch kit Four step switch kit NEMA 4 rated gasket kit Figure-1 Damper Linkage Accessories. TYPICAL APPLICATION (Wiring Diagram) Make all electrical connections in compliance with the job wiring diagram and the national and local electric codes. Typical connections are shown in (Figure-2). Figure-2 External Wiring for Heating Application.
PAGE 4
INSTALLATION Requirements Preferred mounting for the actuator is in the upright position, but other positions are acceptable. Adjustable speed units should never be mounted upside down or with the output shaft pointing upward. Allow six inches clearance above the actuator wiring compartment. If an AM type mounting bracket is not used, the base of the actuator may be used as a template for marking mounting holes. Procedure Actuator may be used in damper and valve control applications.
PAGE 5
Actuator 1 Nylon Bushing Plunger Assembly "C" Ring Front Cover Plunger Cam Mounting Screws (3) Indicator Mounting Bracket Indicator Screw Stem Extension 2 Connecting Pin Cover Screws (2) Stem Locknut Packing Nut 1 1 Not included in AV Kits. 2 Used with 1/2" through 2" valve bodies. Mounting Nut 1 Valve Body (VB-7XXX Shown) 1 Figure-4 Components for Valve Installation of Standard Actuator.
PAGE 6
Mxx-xxx Hazardous Location Actuator 1 Nylon Bushing Plunger Assembly Front Cover Plunger Cam Indicator Mounting Bracket Indicator Screw Stem Extension Connecting Pin Cover Screws (2) Mounting Screws (3) Stem Locknut Packing Nut 1 Mounting Nut 1 Valve Body 1 1 Not included in AV kits. Figure-5 Components for Valve Installation 1/2” to 2” VB-7xxx and VB-9xxx-xxx-4-xx 2-1/2" and 3" Globe Valves for Hazardous Location Actuators.
PAGE 7
WIRING For control and power wiring on low voltage actuators (H, G, R, B AND C terminals), use No. 14 wire on runs under 140 feet and No. 12 wire on longer runs. On line voltage units (L1, L2, R, B, and C terminals), use No. 14 wire on runs up to 1300 feet. Class I circuits must be used for connections to the control and power terminals (L1, L2, R, B, and C terminals) on line voltage actuators.
PAGE 8
CHECKOUT After the entire system has been installed, the following checks for proper operation must be made. 1. Be sure that the system power is connected, and on. 2. Turn thermostat to call for cool. Actuator should rotate clockwise from 0° to 180°, turning off the heating media. (View actuator from output shaft end (front).) 3. Turn thermostat to call for heat. Actuator should rotate clockwise from 180° to 360° (also 0°), and turn on heating media. 4.
PAGE 9
Auxiliary Switch Adjustment The adjustable built-in SPDT auxiliary switch is actuated by the cam nearest to the back of the actuator. Although it can be adjusted to operate at any point in the actuator rotation, it is factory set to operate at approximately mid-stroke. This operating point may be changed by inserting a screwdriver through the opening in the top plate directly behind the terminal block, and engaging the screwdriver with the gear-like plastic disc.
PAGE 10
DIMENSIONAL DATA Figure-8 Standard Actuator Dimensions. Hazardous Location Shown with valve linkage components. Mounting bracket, open/close cover, pointer, and plunger are not included for damper applications. 8-1/4 (209) 1/4 (6) 7-7/8 (200) 4-1/8 (105) 9 (228) OPEN 7 (178) CL OSED 4-1/2 (114) Coupling Line for Actuator 5-7/16 (139) Coupling Line for Valve Body 4-1/4 (108) Dimensions shown are in inches (mm). Allow 12” (300 mm) minimum service clearance above the housing top.
PAGE 11
9 (229) 10-13/16 (275) 4-1/2 (114) 2-1/8 (54) 1-1/4 (32) 5/8 (16) 1/8 (3) 3/4 (19) Pipe Tap On Each Side 2-15/16 (51) Dimensions shown are in inches (mm). Figure-10 Hazardous Location Actuator Side Dimensions. F-08366-13 © Copyright 2008 TAC All Rights Reserved.
PAGE 12
© Copyright 2008, TAC All brand names, trademarks and registered trademarks are the property of their respective owners. Information contained within this document is subject to change without notice. F-08366-13 TAC 1354 Clifford Avenue P.O. Box 2940 Loves Park, IL 61132-2940 www.tac.