Honeywell ML7421A1032, ML7421B1023 Product Data

ML7421A,B

Electric Linear Valve Actuator

PRODUCT DATA

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.

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.

• 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

® U.S. Registered Trademark
Copyright © 1999 Honeywell Inc. • All Rights Reserved

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ML7421A,B ELECTRIC LINEAR VAL VE ACTUATOR

SPECIFICATIONS

Models:

Model No. Stroke in

ML7421A1032 3/4 (20) 95
ML7421B1023

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.

Signal Input:

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.

in. (mm)

1-1/2 (38) 175

Run Time in

s at 60 Hz

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).

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.

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

T able 1. Close-off Ratings in psi for ML7421A,B Electric Linear V alve Actuators and V501 1, V5013 V alves

a

For use only with ML7421B Actuator.

a

6 in.

a

63-2517-2 2

ML7421A,B ELECTRIC LINEAR VAL VE ACTUATOR

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

Valve Model Valve Size in in. Close-Off

V3350, V3351,
V3360, V3361,

V3450, V3451,

V3460, V3461

Table 2. Close-off Ratings in psi for ML7421A,B and
V3350,1; V3360,1; V3451,1; V3461,1 Valves.

a

Represents max. pressure difference between outlet and inlet.

b

For use only with ML7421B Actuators.

2-1/2 63 (434)

3 45 (310)

b

4

b

5

b

6

Rating psi (kPa)

404 lbf (1800N)

25 (172)
16 (110)

11 (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.

Location

a

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.

CAUTION

Disconnect power before installation to prevent
electrical shock or equipment damage.

Fig. 2. Attaching actuator to valve collar.

3

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