Honeywell ML7421A1032 Operation manual

PRODUCTDATA

® U.S. Registered Trademark

ML7421A,B

Electric Linear Valve Actuator

GENERAL

The ML7421A,B Electric Linear Valve Actuators for

modulating controlare equipped with a stepper motor for

exact positioning. The direction of movement is reversible by

means of an internal selector plug. These actuators operate

standard Honeywell valves in heating, ventilating, and air

conditioning (HVAC) applications.

63-2517-2

FEATURES

• Quick and easy installation.

• No separate linkage required.

• 3/4 in. (20 mm) stroke on ML7421A;

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

• No adjustments required.

• Accurate valve positioning.

• Selectable 0(2) to 10 Vdc/0(4) to 20 mA input signal.

• Position feedback.

• Force-limiting end switches.

• Manual operator.

• Direct or reverse acting.

• Synchronous motor.

• Corrosion resistant design.

• Maintenance free.

• Conduit connector knockout.

Contents

General............................................................................ 1

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

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

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

Operation ......................................................................... 5

Checkout ......................................................................... 6

Ordering Information ....................................................... 7

ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR

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Table 1. Close-off Ratings in psi for ML7421A,B Electric Linear Valve Actuators and V5011, V5013 Valves

aFor use only with ML7421B Actuator.

Model No. Stroke in

in. (mm) Run Time in

s at 60 Hz

ML7421A1032 3/4 (20) 95

ML7421B1023 1-1/2 (38) 175

Electrical Ratings:

Power Input: 24 Vac (+10%/-15%), 60 Hz

Power Consumption: 12VA max. at 24Vac

Signal Source Output Resistance:

1 kOhm max.

Load:

1 mA max.

SignalInput:

0 to 10 Vdc or 2 to 10 Vdc

Stem Force:

405 lbf (1800N)

Ambient Temperature Range:

14°F to 122°F (-10°C to +50°C)

Storage Temperature Range:

-40°F to 158°F (-40°C to +50°C)

Humidity:

5 to 95% relative humidity, non condensing.

Close-off Pressure Ratings:

See Tables 1. and 2.

Protection Standard:

IP54

Insulation:

Class II (24 Vac)

Approvals:

UL94-5V Flame retardant.

Meets CE requirements.

Cable Entry:

Two knockout holes for 1/2 in. and 3/4 in. conduit standard

on actuator case.

Actuator Material:

Cover: ABS plastic

Yoke and Base: Diecast aluminium

Weight:

5.1 lb (2.3 kg)

Dimensions:

See Fig. 1.

Accessories:

43191680-102 Dual Auxiliary Switch for ML7421A,B

( for 24 Vac use only).

43196000-101 High Temperature Kit. Includes 1/4 in. and

3/8 in. stem extenders. The kit increases the temperature

range to 428°F (220°C).

43196000-102 High Temperature Kit (2...3 in. valves).

Includes1/4 in. and 3/8 in. stem extenders.

The kit increases the temperature range to

428°F (220°C).

SPECIFICATIONS

Models:

Valve Type 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

V5011A Flange N/A N/A N/A N/A N/A N/A 77 53 29 18 12

V5011B Flange N/A N/A N/A N/A N/A N/A N/A N/A 29 18 12

V5011F Screw 150 150 150 150 150 150 100 61 N/A N/A N/A

V5011G Screw 150 150 150 150 150 150 100 61 N/A N/A N/A

V5013B Flange N/A N/A N/A N/A N/A N/A 77 53 29 18 12

V5013C Flange N/A N/A N/A N/A N/A N/A 77 53 29 18 12

V5013F Screw 150 150 150 150 150 150 N/A N/A N/A N/A N/A

ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR

63-2517-2

Location

Install the actuator in a location that allows enough

clearance for mounting accessories and for servicing. See

Fig. 1.

CAUTION

Do not install the actuator in a position below

horizontal to minimize the risk of damage to the

actuator in the event of condensation or a valve

gland leak.

Mounting

NOTE: Check for valve stem button adjustment dimension.

1. Attach the actuator to the valve collar and tighten the

set screws with a 5/32 in. (4mm) hex wrench.

IMPORTANT:

When tightening the set screws, first tighten the

right set screw. See Fig. 2.

Fig. 2. Attaching actuator to valve collar.

Fig. 1. Approximate dimensions of ML7421A,B Electric Linear Valve Actuator in in. (mm).

Valve Model Valve Size in in. Close-Off

Rating psi (kPa)a

404 lbf (1800N)

V3350, V3351, 2-1/2 63 (434)

V3360, V3361, 3 45 (310)

V3450, V3451, 4b25 (172)

V3460, V3461 5b16 (110)

6b11 (76)

INSTALLATION

When Installing this Product...

1. Read these instructions carefully. Failure to follow them

could damage the product or cause a hazardous

condition.

2. Check the ratings given in the instructions and on the

product 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

Disconnect power before installation to prevent

electrical shock or equipment damage.

Table 2. Close-off Ratings in psi for ML7421A,B and

V3350,1; V3360,1; V3451,1; V3461,1 Valves.

aRepresents max. pressure difference between outlet and inlet.

bFor use only with ML7421B Actuators.

ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR

63-2517-2 4

2. Push the stem button retaining clip and hold.

See Fig. 3.

Fig. 3. Attaching actuator to valve stem.

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

button is inside the large slot of the stem button

retaining clip.

4. Release the stem button retaining clip to secure the

stem button.

5. Check to ensure that the retaining clip holds the

stem button in place.

6. Pull of the manual operation knob, loosen the cover

screws, and remove the actuator cover.

1. Feed the power and control wires through the opening

on the bottom of the actuator case.

2. Using the wiring diagrams in Fig. 4 through 6, connect

the power and control wires to the ML7421. Make sure

that all wiring is correct.

3. When wiring and checkout are complete, replace the

cover, tighten the cover screws, and replace the

manual operator knob, see Fig. 7.

4. Apply cover and control signals to the ML7421.

Fig. 4. ML7421 typical wiring diagram.

Fig. 5. ML7421 wiring diagram using a 0(2) to 10Vdc

output control (e.g. T7759) with two transformers.

Fig. 6. ML7421 wiring diagram using a 0(2) to 10Vdc

output control (e.g. T7759) with one transformer.

Wiring

CAUTION

Disconnect the power supply before wiring to prevent

electrical shock or equipment damage.

All wiring must comply with local electrical codes,

ordinances and regulations. Voltage and frequency of the

transformer used with the ML7421 must correspond with

the characteristics of the power supply and those of the

actuator.

ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR

63-2517-2

OPERATION

General

In the ML7421, the drive of a 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 ML7421 is equipped with a manual operator knob (see

Fig. 7) to open or close the valve in the event of power

failure. Turn off or diconnect the power supply before

manuallly operating the ML7421.

To operate, push down the manual operator knob and turn

the knob counterclockwise to move the stem downward or

clockwise to move the stem upward. If the actuator is

returned to automatic control, the manual operator knob

unlocks automatically.

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

turned, it turns only a short distance before it

automatically disengages without power resumption.

IMPORTANT:

Manual operation allows a very high closing force

that can jam the actuator spindle, exceeding the

rating of the force switches, and stopping the

motor.

After a manual valve close-off operation, release

the spindle one turn by turning the the manual

operator knob so the manual operator

automatically disengages on power resumption.

Auxiliaryswitches

The 43191680 Dual Auxiliary Switch can be used on both

the

ML7421A and ML7421B Electric Linear Valve Actuators.

Switching points are adjustable over the full length of the

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.

IMPORTANT:

Use the 43191680 Dual Auxiliary Switch only with

24 Vac applications.

ACCESSORIES

Fig. 7. ML7421A,B manual operator knob.

Signal Input (+)

The analog input signal (+) range is set at the factory to 0 to

10 Vdc. Changing the position of the W2 selector plug sets

the range to 2 through 10 Vdc.

Changing the W4 position to mA (see Fig. 8.) the ranges are

0(4) to 20 mA. Selector plugs W1, W2, W3 and W4 are

positioned on the back side of the PCB protection sheet.

See Fig. 8 for location of the selector plugs.

2...10V

4...20mA

0...10V

0...20mA

10V

20mA

10V

20mA mA

W1 (W4 )

Fig. 8. Location of selector plugs W1, W2, W3 and W4.

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:

1. 0% — Actuator position corresponds with 0 or 2 Vdc

signal

2. 50% — Actuator stem in mid-position

3. 100% — Actuator position according to 10 Vdc signal

NOTE: W1 is factory set at 50% .

If W4 is set to mA-position, the actuator runs

always to 0% .

ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR

63-2517-2 6

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.

When the actuator stem is fully extended, the output signal

is 10 Vdc.

The output of the signal does not change when the action of

the actuator is reversed using W3 or W4, which is set to

mA-position, see Direction of Action.

Actuator Override

The converter output signal override position can be used in

freeze protection or similar applications. it forces the

actuator into an end position, overriding the control signal.

To exercise this function, connect the 24 Vac common (or

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 relay, see Fig. 9.

Fig. 9. Connection for overriding control sigal to

drive actuator to specific position.

CHECKOUT

The ML7421 Electric Linear Valve Actuator can be checked

out either directly or using a controller.

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.

Direct Checkout

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

towards 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 miswired.

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

input terminals, and the actuator does not run, replace

the actuator.

Direction of Action

The direction of the actuator action can be changed by

repositioning selector plug W3, which is factory set so that

the stem extends on increasing signal and retracts on

decreasing signal. When the actuator stem is fully extended

the output signal from feedback (F) function is 2 Vdc.

ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR

63-2517-2

ORDERINGINFORMATION

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 Logistics

Honeywell Inc., 1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386 (612) 951-1000

In Canada—Honeywell Limited/Honeywell Limitée, 155 Gordon Baker Road, North York, Ontario M2H 3N7.

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.

ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR

63-2517-8

Honeywell Europe S.A.

3 Avenue du Bourget

1140 Brussels

Belgium

Honeywell Asia Pacific Inc.

Room 3213-3225

Sun Hung Kai Centre

No. 30 Harbour Road

Wanchai

HongKong

Home and Building Control

HoneywellLimited-HoneywellLimitée

155 Gordon Baker Road

North York, Ontario

M2H 3N7

Honeywell Latin American Region

480 Sawgrass Corporate Parkway

Suite 200

Sunrise FL 33325

Home and Building Control

Honeywell Inc.

Honeywell Plaza

P.O. Box 524

Minneapolis MN 55408-0524

www.honeywell.com

63-2517-2Printed in U.S.A. 7-99

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