Honeywell ML6421, ML7421 User Manual

Electric Linear Valve Actuators

APPLICATION

The ML6421A,B Non-Spring Return Electric Linear Valve Actuators are suitable for use with low-voltage, single-pole double-throw (spdt), Series 60 two-position and floating controllers. These actuators operate standard Honeywell valves in heating, ventilating, and air conditioning (HVAC) applications.

ML6421, ML7421

Non-Spring Return

PRODUCT DATA

FEATURES

• Quick and easy installation.

• No separate linkage required.

• 3/4 in. (20 mm) stroke on ML6421A and ML7421A.

• 1-1/2 in. (38 mm) stroke on ML6421B and ML7421B.

• No adjustments required.

• Accurate valve positioning.

• Low power consumption.

• Selectable 0(2) to 10 Vdc or 0(4) to 20 mA input signal with ML7421.

• Position feedback with ML7421.

• High close-off ratings.

• Direct/reverse acting with ML7421.

• Force-limiting end switches.

• Manual operator.

• Synchronous motor.

• Corrosion-resistant design.

• Maintenance free.

• Conduit connector knockout.

The ML7421A,B Non-Spring Return Electric Linear Valve Actuators are modulating control actuators used with controls that provide an analog output of 0 to 10 Vdc or 2 to 10 Vdc. These actuators operate standard Honeywell valves in HVAC applications. An internal selector plug can be used to reverse the direction of action.

Contents

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

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

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

Ordering Information ........................................................ 2

Installation ........................................................................ 3

Operation .......................................................................... 6

Checkout .......................................................................... 7

63-2515-4

ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

SPECIFICATIONS

Models:

Model

Stroke in

in. (mm)

Run Time in sec at 60 Hz Description

ML6421A 3/4 (20) 95 Electric Linear

ML7421A

Valve Actuator

ML6421B 1-1/2 (38) 175

ML7421B

Dimensions: See Fig. 1.

Weight: 5.1 lb (2.3 kg).

Electrical Ratings:

Power Input: 24 Vac (+10%, -15%), 60 Hz. Power Consumption: 11 VA maximum at 24 Vac.

Signal Inputs:

ML6421:

24 Vac across T1 and W: Drives stem downward. 24 Vac across T2 and B: Draws stem upward.

ML7421: 0 to 10 Vdc or 2 to 10 Vdc.

Actuator Material:

Cover: ABS plastic. Yoke and Base: Diecast aluminum.

Stem Force: 405 lbf (1800N).

Close-off Pressure Ratings: See Table 1.

Cable Entry: Two knockout holes for 1/2 in. conduit standard

on actuator case.

Ambient Ratings:

Temperature:

Ambient Range: 14°F to 122°F (-10°C to +50°C). Storage Range: -40°F to +158°F (-40°C to +70°C).

Humidity Range: 5 to 95 percent relative humidity,

noncondensing.

Approvals:

Canadian Standards Association Listed. Underwriter’s Laboratories, Inc. UL94-5V Flame Retardant

(file E181716).

Meets CE requirements.

Protection Standard: IP54.

Accessories:

43191679-101 Single Auxiliary Potentiometer for ML6421A. 43191679-102 Single Auxiliary Potentiometer for ML6421B. 43191679-103 Dual Auxiliary Potentiometer for ML6421A. 43191679-104 Dual Auxiliary Potentiometer for ML6421B. 43191680-102 Dual Auxiliary Switch (for 24 Vac use only). 43196000-001 High Temperature Kit (for actuators with 3/4 in.

stroke). Increases maximum temperature to 428°F (220°C).

43196000-102 High Temperature Kit (for actuators with 1-1/2 in.

stroke). Increases maximum temperature to 428°F (220°C).

Table 1. Close-off Ratings for ML6421, ML7421 Electric Linear Valve Actuators and Honeywell Valves (psi).

Type Valve 1/2 in. 3/4 in. 1 in. 1-1/4 in. 1-1/2 in. 2 in. 2-1/2 in. 3 in. 4 in.a5 in.a6 in.

Flange V5011A,B,C — — — — — — 77 53 29 18 12

V5011B ———— — —— —

V3350/51/60/61;V3450/51/60/61 — — — — — —

NPT V5011F,G

V5011N1xxx, V5011N3xxx,

150

150c150c150

150

230 230 230 230 230 126 — —

100 61 — — —

45b25b16b11

V5013N

V5011N2xxx

100

100d100d100

100

V5013F 150 150 150 150 150 150

For use with ML6421B or ML7421B Actuators only.

Represents maximum pressure difference between the outlet and either of the two inlets.

Do not exceed 100 psi with V5011G valves used in steam applications.

Rating is for steam at maximum 100 psi. Ratings for water applications are the same as for the V5011N1xxx.

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number.

If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Home and Building Control Sales Office (check white pages of your phone directory).

2. Home and Building Control Customer Relations

Honeywell, 1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386 In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9. International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.

63-2515—4 2

ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

ML6421A,ML7421A ML6421B, ML7421B

7 (178 ) X 7 (178)

KNOCKOUTS (2) 7/8 (22)

YOKE DIAMETER 1-7/8 (48)

(204)

11-7/8

(301)

CLEARANCE

12-3/4

(326)

MINIMUM

M17430

2-1/2 (64)

7 (178 ) X 7 (178)

KNOCKOUTS (2) 7/8 (22)

YOKE DIAMETER 1-3/8 (35)

5-5/8 (142)

9-3/8 (239)

CLEARANCE

10-3/8

(264)

14-1/4

(360)

MINIMUM

2-1/2 (64)

Fig. 1. Approximate dimensions of ML6421, ML7421 Electric Linear Valve Actuators in in. (mm).

16-7/8

(430)

INSTALLATION

When Installing this Product…

1. Read instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.

2. Check ratings and description given in the specifications 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.

CAUTION

Electrical Shock or Equipment Damage Hazard. Can shock individuals or short equipment circuitry.

Disconnect power supply before installation.

Location

Install the actuator in a location that allows enough clearance for mounting accessories and for servicing.

CAUTION

Equipment Damage Hazard. Can damage actuator due to condensation or a valve gland leak.

Install the actuator in a position above horizontal.

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