Honeywell Ml6421 Users Manual 63 2515 ML6421, ML7421 Non Spring Return Electric Linear Valve Actuators

ML6421 63-2515

ML7421 to the manual bafade24-1e70-4b80-a052-9050692ad876

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PRODUCT DATA

63-2515-4

® U.S. Registered Trademark

Copyright © 2002 Honeywell • All Rights Reserved

®

ML6421, ML7421

Non-Spring Return

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.

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.

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.

Contents

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

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

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

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

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

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

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

ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

63-2515—4 2

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.

SPECIFICATIONS

Models:

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).

aFor use with ML6421B or ML7421B Actuators only.

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

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

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

Model

Stroke in

in. (mm)

Run Time in

sec at 60 Hz Description

ML6421A 3/4 (20) 95 Electric Linear

Valve Actuator

ML7421A

ML6421B 1-1/2 (38) 175

ML7421B

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.a

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

V5011B ———— — —— —

V3350/51/60/61;V3450/51/60/61 — — — — — — 63b45b25b16b11b

NPT V5011F,G 150c150c150c150c150c150c100 61 — — —

V5011N1xxx, V5011N3xxx,

V5013N

230 230 230 230 230 126 — —

V5011N2xxx 100d100d100d100d100d100d

V5013F 150 150 150 150 150 150

ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

3 63-2515—4

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

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.

2-1/2

(64) 2-1/2

(64)

7 (178 ) X 7 (178) 7 (178 ) X 7 (178)

5-5/8

(142)

KNOCKOUTS

(2)

7/8 (22) 9-3/8

(239)

10-3/8

(264)

14-1/4

(360)

MINIMUM

CLEARANCE

8

(204)

11-7/8

(301)

12-3/4

(326)

16-7/8

(430)

MINIMUM

CLEARANCE

ML6421A,ML7421A ML6421B, ML7421B

M17430

YOKE DIAMETER 1-3/8 (35)

KNOCKOUTS

(2)

7/8 (22)

YOKE DIAMETER 1-7/8 (48)

ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

63-2515—4 4

Mounting

1. Place the actuator on the valve with the U-bolt around

the valve collar. See Fig. 2.

IMPORTANT

When tightening the set screws, first tighten the right

set screw. See Fig. 2.

2. Place the U-bolt against the valve collar and secure the

actuator to the valve by turning each U-bolt nut clock-

wise.

NOTE: To assure even pressure on the collar, first

tighten the nuts finger-tight and then alternate

turning each U-bolt nut until both are snug.

3. Push aside the stem button retaining clip and hold. See

Fig. 2.

4. Lift the valve stem until the head of the valve stem

button is inside the large slot of the stem button

retaining clip on the actuator.

5. Release the stem button retaining clip to secure the

stem button. Check to make certain the stem button is

secured by the retaining clip.

6. Pull off the manual operation knob.

7. Remove the cover from the actuator using a Phillips or

crosspoint screwdriver. See Fig. 3.

Fig. 2. Attaching actuator to valve.

Fig. 3. Removing actuator cover.

Wiring

CAUTION

Electrical Shock or Equipment Damage Hazard.

Can shock individuals or short equipment

circuitry.

Disconnect power supply before installation.

IMPORTANT

1. All wiring must comply with local electrical codes,

ordinances and regulations.

2. Voltage and frequency of the transformer used with

the actuator must correspond with the characteristics

of the power supply and those of the actuator.

NOTE: See Fig. 5 through 8 for typical wiring hookups.

1. Feed power and control wires through the conduit

connector located on the bottom of the actuator case.

CAUTION

Equipment Damage Hazard.

Conduit connection or removal can break an

unsupported connector.

When removing or attaching conduit, use a wrench to

support the motor connector.

2. Using the appropriate wiring diagram (see Fig. 5 through

8), connect power and control wires to the actuator.

Make sure that all wiring is correct.

3. For the ML7421 only: Check selector plugs for proper

settings. See Signal Input Failure section for details.

4. When wiring is complete, replace the actuator cover

and control knob (see Fig. 9).

5. Apply power and control signals to the actuator.

Fig. 4. Connecting wiring to the actuator.

M

17431

TIGHTEN RIGHT

SET SCREW FIRST

M17432

M6630

ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

5 63-2515—4

Fig. 5. ML6421 typical wiring diagram.

Fig. 6. ML7421 typical wiring diagram.

Fig. 7. ML7421 wiring using voltage input control and

separate transformers.

Fig. 8. ML7421 wiring using voltage input control and a

common transformer.

Fig. 9. Replacing actuator cover.

Auxiliary Potentiometers

The 43191679 Auxiliary Potentiometers can be used as feed-

back potentiometers and to provide remote indication of the

valve position. See the Accessories section for part numbers.

See Installation Instructions packed with the potentiometers

for details.

Auxiliary Switches

The 43191680 Dual Auxiliary Switch can be used on both the

ML6421 and ML7421 Electric Linear Valve Actuators.

Switching points are adjustable over the full actuator stroke.

For example, the switch can be used to switch pumps or to

provide remote indication of any stroke position. See the

Installation Instructions packed with the auxiliary switch for

details.

IMPORTANT

Use the 43191680 Dual Auxiliary Switch only with

24 Vac applications.

WIRING

STRIP

T1

T2

W

B

1

L1

(HOT)

L2

W

R

W

B

T

Y

G

R

BSPDT

ML6421A,B

2

3

POWER SUPPLY. PROVIDE DISCONNET MEANS AND

OVERLOAD PROTECTION AS REQUIRED.

ALL WIRING BLOCKS HAVE THE SAME NUMBER

OF TERMINALS (8), BUT THE ONLY TERMINALS

THAT ARE ACTIVE ON THIS BLOCK ARE T1,W,AND B.

THE R-W-B AND T-Y-G TERMINALS ARE A SIX

TERMINAL WIRING BLOCK SEPARATE FROM THE

MAIN BLOCK. THEY DO NOT APPEAR ON ALL

MODELS BECAUSE R-W-B ARE FOR A SINGLE

FEEDBACK POTENTIOMETER AND T-Y-G ARE

FOR A SECOND FEEDBACK POTENTIOMETER

(BOTH POTENTIOMETERS ARE 220 OHMS). THE

REQUIRED WIRING BLOCKS ARE PART OF THE

POTENTIOMETER ACCESSORY KITS.

1

2

3

CONTROLLER

M17433

WIRING

STRIP

T1

+

T2

O1

O2

1

L1

L2

–

+

OUTPUT

2

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

0 TO 10 OR 2 TO 10 VDC CONTROL SIGNAL

(DEPENDING ON ACTUATOR MODEL).

1

2

M17434A

ML7421

L1

L2 1

1

1

1

2

2

3

3

456

L1

L2

1

T775 (WITH 2 TO 10 VDC OUTPUT)

DUAL

TRANSFORMERS

SENSOR

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED. M17435A

WIRING

STRIP

T1

+

T2

O1

O2

ML7421

L1

(HOT)

L2 1

1

1

1

2

2

3

3

456

T775 (WITH 2 TO 10 VDC OUTPUT)

SINGLE

TRANSFORMER

SENSOR

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED. M17436A

40 VA, 24 VAC

WIRING

STRIP

T1

+

T2

O1

O2

ML7421

M17464

ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

63-2515—4 6

OPERATION

General

The drive of the actuator synchronous motor is converted into

the linear motion of the actuator stem by using a worm gear

transmission. A button retainer clip connects the actuator

stem to the valve stem.

The internal force sensor, using installed microswitches, turns

off the actuator when the specified stem force is reached.

Manual Operation

The ML6421 and ML7421 are equipped with a manual

operator knob (see Fig. 10) to open or close the valve in the

event of power failure:

1. Turn off or disconnect the power supply before manually

operating the actuator.

2. Push down on the manual operator knob and turn the

knob:

a. Counterclockwise to drive the stem downward.

b. Clockwise to draw the stem upward.

IMPORTANT

Manual operation allows very high closing force that

can jam the actuator spindle, exceed the force switch

ratings, and stop the motor. After a manual valve

close-off operation, release the spindle one turn by

turning the manual operator knob. This will ensure

automatic disengagement of the manual operator

upon power resumption.

NOTE: If the manual operator knob is not pushed in while

turned, it will rotate only a short distance before

disengaging without power resumption.

Fig. 10. Manual operator knob.

ML7421

Signal Input Failure

Using selector plug W1, the actuator can be set to run to one

of three positions in event of a signal failure:

• 0%: Actuator position corresponds with 0 or 2 Vdc signal.

• 50%: Actuator stem in mid-position.

• 100%: Actuator position according to 10 Vdc signal.

NOTE: If W4 is set to the mA position, the actuator always

runs to 0 percent.

Output Signal Feedback (F)

An analog output signal (2 to 10 Vdc) that represents the

actual actuator stem position is available at Terminal F. It can

be used for remote indication of the stem position.

With the actuator stem fully down, the output signal is 10 Vdc.

The output of the signal does not change when the actuator

action reverses using W3 or W4 (see Signal Input Failure

section and Fig. 11).

Fig. 11. Location of selector plugs.

M6640

M17437

0-10V

(0-20mA)

2-10V

(4-20mA)

W2

10V (20mA) 0%

10V (20mA)

VmA

W4

W3 W1

100%50%

ML6421, ML7421 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

7 63-2515—4

Actuator Override

To override the control signal (for freeze protection or similar

applications), connect the 24 Vac common (T2) to either

terminal O1 or O2. Connecting to terminal O1 fully extends

the actuator stem. Connecting to O2 fully retracts the actuator

stem.

The control signal (+) is ignored when the override signal is

applied to terminal O1 or O2. This override can be achieved

with a switch or a relay. See Fig. 12.

Direction of Action

The direction of action can be changed by repositioning the

selector plug W3.

Fig. 12. Connections for overriding control signal to drive

actuator to a specific position.

CHECKOUT

The actuator can be checked out either directly or using a controller.

Direct Checkout

1. Mount the actuator for the required application.

2. Check the valve position and make sure that 24 Vac is

correctly applied to the actuator.

3. Apply the control signal to the appropriate leadwires to

move the valve in the required direction.

4. If the actuator does not move, make sure the actuator is

properly installed.

5. If the actuator is correctly installed and does not run,

replace the actuator.

Controller Checkout

1. Adjust the setpoint of the controller to call for opening or

closing the valve. Observe the actuator.

2. If the valve is closed, it should begin to open.

3. If the valve remains closed, move the setpoint further

toward the open setting.

4. If the valve does not move, check for 24 Vac in the

actuator power input.

5. If 24 Vac is present and the actuator does not operate,

reverse the controller leadwires to determine if the

device is incorrectly wired.

6. If wiring is correct, 24 Vac is present on the power input

terminals, and the actuator does not run, replace the

actuator.

POWER SUPPLY. PROVIDE DISCONNECT MEANS

AND OVERLOAD PROTECTION AS REQUIRED.

F

+

0-10Vdc OR 2-10 Vdc CONTROL SIGNAL. SEE SIGNAL

INPUT (+) SECTION.

SEE OVERRIDE SECTION FOR DETAILS ON

OVERRIDE OPERATION.

2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL

FEEDBACK SECTION.

ML7421

WIRING

STRIP

F

+

–

T2

T1

O1

O2

1

3

4

2

INPUT

(FEEDBACK)

OUTPUT

3

2

SP3T

OVERRIDE

SWITCH

41

L1

(HOT)

L2

–

M17438

63-2515—4 B.B. Rev. 1-03 www.honeywell.com

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paper containing at least 10%

post-consumer paper fibers.

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