Honeywell Ml6420 Users Manual 63 2533—03 ML6420, ML7420 Non Spring Return Electric Linear Valve Actuators

ML7420 to the manual ac1477e3-b1dd-404d-bfe2-01d49c0a091e

2015-01-23

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ML6420, ML7420
Non-Spring Return
Electric Linear Valve Actuators
PRODUCT DATA

FEATURES
• Quick and easy installation.
• No separate linkage required.
• Conduit connector is standard.
• No adjustments required.
• Low power consumption.
• High close-off ratings.
• Force-limiting end switches.
• Manual operator.
• Synchronous motor.
• Corrosion resistant design.

APPLICATION
The ML6420 Non-Spring Return Electric Linear Valve
Actuators are floating control actuators used with controllers
that provide a switched or floating single-pole double-throw
(spdt) output. These actuators operate standard Honeywell
valves in heating, ventilating, and air conditioning (HVAC)
applications.

• Maintenance free.
• Direct/reverse acting with ML7420.
• Position feedback signal included with ML7420.
• Selectable 0 to 10 Vdc or 2 to 10 Vdc signal input with
ML7420.

The ML7420 Non-Spring Return Electric Linear Valve
Actuators are modulating control actuators used with
controllers 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 ........................................................................
Installation ........................................................................
Ordering Information ........................................................
Operation ..........................................................................
Checkout ..........................................................................

1
3
2
7
8

63-2533-03

ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

SPECIFICATIONS
B and 24 Vac: Drives valve stem down.
W and 24 Vac: Draws valve stem up.
ML7420: 0 to 10 Vdc or 2 to 10 Vdc.

Models:
Model

Run Time in
sec at 60 Hz

ML6420A 30 or
ML7420A
a

60a

Stroke in
in. (mm)
3/4 (20)

Description

Actuator Material:
Cover: ABS-FR plastic.
Base: PBTP-FR plastic.
Yoke: Diecast aluminum.

Electric Linear
Valve Actuator

Dependant on actuator model.

Dimensions: See Fig. 1.

Actuator Stroke: 3/4 in. (20 mm).

Weight: 2.9 lb (1.3 kg).

Close-off Pressure Ratings: See Table 1.

Electrical Ratings:
Power Input: 24 Vac ±15%, 60 Hz.
Power Consumption:
ML6420: 6 VA maximum at 24 Vac.
ML7420: 7 VA maximum at 24 Vac.
Signal Source Output Resistance: 1K ohm maximum.
Signal Load: 1 mA maximum.

Protection Standard: IP54.
Approvals:
Canadian Standards Association Listed.
Underwriter’s Laboratories, Inc. UL94-5V Flame Retardant.
Meets CE requirements.
Cable entry: Conduit connector and one knockout on case.

Ambient Ratings:
Temperature:
Ambient: 14°F to 122°F (-10°C to +50°C).
Storage: -40°F to +158°F (-40°C to +70°C).
Maximum Valve Medium: 300°F (150°C).
Humidity: 5 to 95 percent relative humidity, noncondensing.

Accessories:
43196000-001 High Temperature Kit (1/2 to 3 in. valves).
Increases temperature range high-end to 428°F
(220°C).
For ML6420/ML6425
43191679-111 Single Auxiliary 10K ohm Potentiometer.
43191679-112 Single Auxiliary 220 ohm Potentiometer.
43191680-105 Dual Auxiliary Switch (for 24 Vac use only).
For ML7420/ML7425
43191680-205 Dual Auxiliary Switch (for 24 Vac use only).

Stem Force: 135 lbf (600N).
Signal Inputs (Supply Voltage Between Terminals):
ML6420:

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 Honeywell Automation and Control Products Sales Office (check white pages of your phone directory).
2. Honeywell Customer Care
1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386
3. http://customer.honeywell.com or http://customer.honeywell.ca
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Toronto, 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.
63-2533—03

ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

Table 1. Close-off ratings for ML6420, ML7420 Electric Linear Valve Actuators and Honeywell Valves (psi).
Type
Flange

NPT

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.

V5011A

—

V3350/3351/3450/3451

—

V5013B,C; V3360/3361/3460/3461

—

21a

14a

V5011F,G

150b

134b

V5011H,J

150

145

—

V5011N1xxx, V5011N3xxx, V5013N

230

163

104

V5011N2xxx

100

V5013F

150

126

Represents maximum pressure difference between the outlet and either of the two inlets.
not exceed 100 psi with V5011G valves used in steam applications.

bDo

CAUTION

5-5/15 6-5/16
(135) x (161)

Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment circuitry.
Disconnect power supply before installation.

12-11/16 (322)
MINIMUM
CLEARANCE

2-11/16 (67)

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

9-3/16
(233)

CAUTION

9-9/16
(242)
1/2 (13) FPT

Equipment Damage Hazard.
Can damage actuator due to condensation or a
valve gland leak.
Install the actuator in a position above horizontal.

5-9/16
(141)

YOKE
DIAMETER
1-3/8 (35)

Mounting
1.

M17419

Fig. 1. Approximate dimensions of ML6420, ML7420
Electric Linear Valve Actuator in in. (mm).

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.

INSTALLATION
When Installing this Product...
1.
2.
3.
4.

Place the actuator on the valve with the U-bolt around
the valve collar. See Fig. 2.
Place the U-bolt against the valve collar and secure the
actuator to the valve by turning each U-bolt nut clockwise.

Read instructions carefully. Failure to follow them could
damage the product or cause a hazardous condition.
Check ratings and description given in the specifications
to make sure the product is suitable for your application.
Installer must be a trained, experienced service
technician.
After installation is complete, check out product
operation as provided in these instructions.

4.
5.
6.

Push aside the stem button retaining clip and hold. See
Fig. 3.
Lift valve stem until the head of the valve stem button is
inside the large slot of the stem button retaining clip on
the actuator.
Release the stem button retaining clip to secure the stem
button. Check to make certain the stem button is secured
by the retaining clip.
Remove the cover from the actuator using a Phillips or
crosspoint screwdriver. See Fig. 4.

63-2533—03

ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

All wiring must comply with local electrical codes, ordinances
and regulations. Voltage and frequency of the transformer
used with the actuator must correspond with the power supply
and actuator characteristics. See Fig. 6 through 11 for typical
wiring hookups.
1.

Feed power and control wires through the conduit
connector located on the bottom of the actuator case.
See Fig. 5.

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.
M6632

Fig. 2. Attaching actuator to valve collar.

4.
5.

Using the wiring diagram in Fig. 6, connect power and
control wires. Make sure that all wiring is correct.
For ML7420 only: Check the selector plugs for proper
settings. See Signal Input Failure section for details.
When wiring is complete, replace the actuator cover. See
Fig. 7.
Apply power and control signals to the actuator.

M6630

M6633

Fig. 5. Connecting power and control wiring.

Fig. 3. Securing actuator to valve.
ML6420A,B
T6984 (FLOATING CONTROLLER)

MOTOR OPEN

WIRING
STRIP
T1

MOTOR CLOSE

24 Vac

COMMON

B
O

M17420

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, T2, W, AND B.

Fig. 4. Removing actuator cover.

Wiring
4

CAUTION

Electrical Shock or Equipment Damage Hazard.
Can shock individuals or short equipment circuitry.
Disconnect power supply before installation.

63-2533—03

THE T-Y-G TERMINALS ARE A THREE TERMINAL
WIRING BLOCK SEPARATE FROM THE MAIN
BLOCK. THEY DO NOT APPEAR ON ALL MODELS
BECAUSE THEY ARE FOR A SINGLE FEEDBACK
POTENTIOMETER (10K OR 220 OHMS). THE
REQUIRED WIRING BLOCKS ARE PART OF
THE POTENTIOMETER ACCESSORY KITS.
MOTOR OPEN SIGNAL DRAWS VALVE STEM
UPWARDS. MOTOR CLOSE SIGNAL DRIVES
VALVE STEM DOWNWARDS.

Fig. 6. ML6420 wiring.

T
Y
G

1
L1
(HOT)
L2

M32766

ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

ML7420
WIRING
STRIP

ML7420

+
–

6
1
L1
(HOT)
L2

–

SENSOR

WIRING
STRIP

INPUT
(FEEDBACK)
OUTPUT

+
–

T2
T1

DUAL
TRANSFORMERS

500 OHM
RESISTOR
T775
(WITH 4-20 MA OUTPUT)

L1
(HOT)
L2
1

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.

2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL
FEEDBACK SECTION.

0-10 Vdc OR 2-10 Vdc CONTROL SIGNAL. SEE SIGNAL
INPUT (+) SECTION.
M17422

L1
(HOT)
1
L2
POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

M17425

Fig. 10. ML7420 wiring using a 4 to 20 mA
control signal and separate transformers.

Fig. 7. ML7420 wiring using feedback output from
a controller with a common transformer.

SENSOR
ML7420

ML7420
WIRING
STRIP

SENSOR
1

1
L1
(HOT)
L2

+
–
T2

6
1
L1
(HOT)
L2

T2
T1

SINGLE
TRANSFORMER
40 VA 24 VAC

500 OHM
RESISTOR
T775
(WITH 4-20 MA OUTPUT)

T775
(WITH 2-10 VDC OUTPUT)
L1
(HOT)
L2

+
–

DUAL
TRANSFORMERS

1
1

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

WIRING
STRIP

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

M17426

Fig. 11. ML7420 wiring using a 4 to 20 mA
control signal and a common transformer.

M17423

Fig. 8. ML7420 wiring using a 2 to 10 Vdc
control signal and separate transformers.

ML7420
WIRING
STRIP

SENSOR
1

+
–
T2

0% 50% 100%

1
L1
(HOT)
L2

SINGLE
TRANSFORMER
40 VA 24 VAC

O1
O2

T775
(WITH 2-10 VDC OUTPUT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

M32767

M17424

Fig. 12. Location of W1, W2, and W3 selector plugs.

Fig. 9. ML7420 wiring using a 2 to 10 Vdc
control signal and a common transformer.
5

63-2533—03

ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

M17428

Fig. 13. Replacing actuator cover.

63-2533—03

ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

Auxiliary Potentiometers
The 43191679 Auxiliary Potentiometers can be used as
feedback potentiometers and to provide remote indication of
valve position. See the Installation Instructions packed with the
potentiometers.

Auxiliary Switches
The 43191680 Dual Auxiliary Switch can be used on both the
ML6420 and ML7420 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.

CAUTION

Equipment Damage Hazard.
Improper voltage damages the auxiliary switch
beyond repair.
Use the 43191680 Dual Auxiliary Switch only with
24 Vac applications.

M6640

Fig. 14. Manual operator knob.

OPERATION

ML7420

General

Signal Input (+)

In the actuator, the drive of a synchronous motor is converted
into the linear motion of the actuator stem by using a spur gear
transmission. A button retainer clip connects the actuator stem
to the valve stem.

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. Selector plugs W1, W2, and W3 are
positioned on the back side of the printed circuit board. See
Fig. 12 for location of the selector plugs.

Manual Operation

Signal Input Failure

The ML6420 and ML7420 are equipped with a manual
operator knob (see Fig. 14) 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.

Using the potentiometer, the actuator can be set to run to any
position in event of a signal failure (ML7420/25 only). ML6420
does not have any input signal failure jumpers or
potentiometers.

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 downward, the output signal is 10 Vdc.

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.

When the valve stem is up, the output signal is 0 or 2 Vdc. The
output of the signal does not change when the action of the
actuator is reversed using W3. See Direction of Action.

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.

NOTE: If the manual operator knob is not pushed in while
turned, it will rotate only a short distance before
disengaging without power resumption.

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. 15.

63-2533—03

ML6420, ML7420 NON-SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS

Direction of Action (ML7420/25 only)
The direction of the actuator action can be changed using the
pushbutton and LED, which is factory set so that the actuator
drives the valve stem down on increasing signal and draws
the valve stem up on decreasing signal. With the valve stem
up, the output signal from the feedback (F) function is either 0
or 2 Vdc. The output of the signal does not change when W3
is used to reverse the actuator action. See Fig. 12.

ML7420
WIRING
STRIP

+
–

INPUT
(FEEDBACK)
OUTPUT

–

T2
T1
O1

SP3T
OVERRIDE
SWITCH

O2
4
1
L1
(HOT)
L2
1

POWER SUPPLY. PROVIDE DISCONNECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.

2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL
FEEDBACK SECTION.

0-10Vdc OR 2-10 Vdc CONTROL SIGNAL. SEE SIGNAL
INPUT (+) SECTION.

SEE OVERRIDE SECTION FOR DETAILS ON
OVERRIDE OPERATION.

M17429

Fig. 15. Connections for overriding control signal
to drive ML7420 to a specific position.

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

Direct Checkout
1.
2.
3.
4.
5.

Controller Checkout

Mount the actuator for the required application; see
Installation section.
Check the valve position and make sure that 24 Vac is
correctly applied to the actuator.
Apply the power to the appropriate leadwires to move
the valve.
If the actuator does not move, make sure the actuator is
properly installed/wired.
If the actuator installation and wiring are both correct
and the actuator does not run, replace the actuator.

1.
2.
3.
4.
5.
6.

Adjust the setpoint of the controller to call for opening
the valve. Observe the actuator.
If the valve is closed, it should begin to open.
If the valve remains closed, move the setpoint further
toward the open setting.
If the valve does not move, check for 24 Vac in the
actuator power input.
If 24 Vac is present and the actuator does not operate,
check the voltage across the controller leadwires to
determine if the device is miswired.
If the wiring is correct, 24 Vac is present on the power
input terminals, and the actuator does not run, replace
the actuator.

Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com

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Title                           : 63-2533—03 - ML6420, ML7420 Non-Spring Return Electric Linear Valve Actuators
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Honeywell Ml6420 Users Manual 63 2533—03 ML6420, ML7420 Non Spring Return Electric Linear Valve Actuators

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