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ML7421A,B
Electric Linear Valve Actuators
GENERAL
These actuators enable modulating control in conjunction with
controls providing an analog output. The direction of
movement is reversible by means of an internal selector plug.
They operate Honeywell’s standard valves in heating,
ventilation, and air conditioning (HVAC) applications.
SPECIFICATION DATA
FEATURES
• Quick and easy installation
• No separate linkage required
• No adjustments
• Force-limiting end switches
• Manual operator
• Synchronous motor
• Corrosion-resistant design
• Selectable 0...10 Vdc or 2...10 Vdc/
0...20 mA or 4...20 mA input signal
• Position feedback signal
• Direct or reverse-acting adjustable
• Selectable stroke position on signal failure
• Maintenance-free
SPECIFICATIONS
Temperature Limits
Ambient operating limits -10...+50 °C @ 5...95%rh
Ambient storage limits -40...+70 °C @ 5...95%rh
Medium valve temperature Max. +150 °C (220 °C with
High-Temperature Kit)
Safety
Protection class III according to EN60730-1
Protection standard IP54 according to EN60529
Flame retardant housing V0 according to UL94, with
metal cable gland
Noise level ≤45dB(A)
Signals
Input range Y = 0(2)...10 Vdc, 0(4)...20 mA
Input impedance
for voltage R
for mA R
Signal source output
impedance Max. 1 kΩ
Output voltage range Position: 2...10 Vdc
Output load Max. 1 mA
Wiring
Wiring terminals 1.5 mm2
Cable entry M20x1.5 and knock-out for
PG11
Material
Cover ABS-FR
Yoke and Base Aluminum diecast
Weight 2.0 kg
Dimensions see Fig. 3 and Fig. 4
= 100 kΩ
i
= 500 Ω
i
® U.S. Registered Trademark EN0B-0416GE51 R0409
Copyright © 2009 Honeywell Inc. All Rights Reserved.
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ML7421A,B ELECTRIC LINEAR VALVE ACTUATORS
model number ML7421A3004 ML7421B3003
supply voltage
power consumption
signal input 0(2) Vdc
signal input 10 Vdc
stroke
run-time at 50 Hz
nominal stem force
Actuator stem retracted. Two-way valve: open, three-way valve port A - AB: closed
Actuator stem extended. Two-way valve: closed, three-way valve port A - AB: open
OPERATION
General
The drive of a synchronous motor is converted into linear
motion of the actuator stem by using a worm gear
transmission.
The actuator stem is connected with the valve stem by a
button keyed retainer connection.
Via installed microswitches, the internal force sensor switches
off the actuator precisely when the nominal stem force is
reached.
If used as a replacement of an already-installed actuator
M7421A,B, the following issue is to observe:
• Permanent power supply (see section "Electrical
Installation")
Manual Operation
The actuators are equipped with a manual operator used in
case of power failure. Manual operation is possible only after
the power supply has been switched off or disconnected.
To operate, push the manual operator knob down and turn
clockwise to move the stem upward and counter-clockwise to
move the stem downward. If the actuator returns to automatic
control, the manual operator knob unlocks automatically.
24 Vac (+10%/-15%); 50/60 Hz
14 VA (50 Hz) / 16 VA (60 Hz)
20 mm 38 mm
1.9 min 3.5 min
1800 N
Input Signal Range
The range of the analog input signal Y (0...10 Vdc / 0...20 mA
or 2...10 Vdc / 4...20 mA) can be selected by changing the
position of jumper plug W2 (Fig. 1.). The factory set is at
0...10 Vdc.
Direction of Action
The direction of action (direct or reverse) can be selected by
changing the position of jumper plug W3 (Fig. 1.). The factory
set is: stem extends at increasing signal (direct acting).
NOTE: Jumper plugs W1, W2, W3, and W4 are accessible
after the cover has been removed. They are located
on top side of the printed circuit board (see Fig. 2).
W4
W1
W3
W2
NOTE: Manual operation allows a very high closing force
capable of jamming the actuator spindle and
exceeding the rating of the force switches, so that
the motor cannot move.
Therefore, after a manually close-off operation, it is
necessary to release the spindle one turn by turning
the manual operator knob, thus ensuring that the
manual operator will automatically disengage on
power resumption.
Fig. 1. Location of jumper plugs W1, W2, W3, W4
Electrical Installation
24 V∼ and 24 V⊥ (see Fig. 3.) must be applied under all
operating conditions.
Cable length/diameter for field mounting:
• Max. 200 m / 1.5 mm2
Input Signal
The Vdc- or mA-input signal is selected by shifting jumper
plug W4 (see Fig. 2). The factory setting of W4 is "Vdc". No
external resistor for mA-input signal is necessary.
EN0B-0416GE51 R0409 2
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ML7421A,B ELECTRIC LINEAR VALVE ACTUATORS
V
V
W4 =
V
W3
10 V
20 mA
10 V, 20 mA
W3 =
10 V
20 mA
W4
mA
W4 =
W3 =
10 V, 20 mA
W2
2...10 V
4...20 mA
W1
0...10 V
0...20 mA
YY
I M O
0
I M O
100
I M O
Fig. 2. Effects of jumper plugs W1, W2, W3, W4
I M O
I M O
I M O
100
0
Output Signal "POSITION"
An analog output signal 2...10 Vdc ”POSITION” representing
the actuator stroke 0...100% can be selected. It can be used
for remote indication.
When the actuator stem is fully extended, the output signal is
10 Vdc.
Y-Signal Override
To override the Y-signal, inputs 1 and 2 (see Fig. 3.) must be
connected as follows:
• stem extended: 24 V⊥ at input 1; input 2 not connected
• stem retracted: 24 V⊥ at input 2; input 1 not connected
24 Vac power and ground must be permanently connected.
Input Signal Failure
In case of a signal input (Y) e. g. a broken wire, the actuator
will run to one of the three positions (possible only if W4 has
been set to the "V" position):
• 0%: actuator stem position for 0(2) Vdc
• 50%: actuator stem in central position
• 100%: actuator stem position for 10 Vdc
The factory setting of W1 is "50%".
Accessories
The following accessories are available upon request.
Auxiliary Switches
The actuators can be equipped on-site with an auxiliary switch
unit with two switches. Their switching points are adjustable
over the full length of the actuator stroke.
The switches can be used e.g. to switch pumps or to provide
remote indication of any stroke position.
A cable gland PG11 is delivered with the unit.
type
auxiliary switches; 24 Vac / 5 (3) A
(package contains 2 SPDT
switches)
High-Temperature Kit
Two options for applications with a medium valve temperature
of +150...+220 °C are available for the following valves:
valve DN
V5011A/V5011K
V5013A/V5013G
V5011R/V5013R
V5328A/V5329A
V5011A
V5013A/V5013G
V5328A/V5329A
V5049A
V5050A
15 - 40
15 - 40
15 - 50
15 - 32
50
50
40 - 80
15 - 65
15 - 80
for
stroke
20 mm
38 mm
order no.
43191680-002
High Temperature Kit
Order No.
43196000-001
43196000-002
EN0B-0416GE51 R0409
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ML7421A,B ELECTRIC LINEAR VALVE ACTUATORS
CLOSE-OFF PRESSURE RATINGS
Stroke 20 mm 38 mm
Valve mm 15 20 25 32 40 50 65 80 80 100 125 150
Size inch 1/2 3/4 1 1 ¼ 1 ½ 2 2 ½ 3 3 4 5 6
Valves close-off pressure ratings (in kPa)
V5011R 1600 1600 1500 850
V5011K 1600 1600
V5013R 1600 1600 1500 850
V5015A 150 120 80
V5025A 2500 2500 2500
V5328A 1600 1600 1600 1600 1300 750 470 230
V5329A (PN16) 1000 1000 1000 650 400
V5329C (PN6) 600 600 600 400
V5049A 2500 2500 2500 2000 1300 750 500 230 230 90 90
V5050A 2500 2500 2500 2000 1300 750 500 230 230 90 90
= Use 600 N actuator
For details on the valves, see the following Specification Data No.:
V5011R EN0B-0064GE51 V5328A EN0B-0432GE02 V5095A EN0B-0412GE51
V5011S EN0B-0085GE51 V5329A/5050A EN0B-0310GE51 V5013R EN0B-0065GE51
V5016A EN0B-0440GE51 V5025A EN0B-0442GE51 V5013E EN0B-0446GE51
V5049A EN0B-0238GE51
EN0B-0416GE51 R0409 4
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ML7421A,B ELECTRIC LINEAR VALVE ACTUATORS
V
DIMENSIONS
178x (178)
64
178x (178)
64
430
Wiring
0...10 V / 0...20 mA
2...10 V / 4...20 mA
additional
knock-out for
cable fitting:
18.9 (PG11)
Fig. 3. ML7421A (dimensions in mm)
10 V / 20 mA
10 V / 20 mA
W3
W2
142
position
239
0(2)...10 V
Y
}
0(4)...20 mA
24 V
M
24 V
24 V ~
W1
1
2
W4
Y-signal
override
mA
0
0
%
50
0
100
0
Fig. 5. Wiring ML7421A,B
360
additional
knock-out for
cable fitting:
264
18.9 (PG11)
326
301
204
}
2...10 V
24 V~
Fig. 4. ML7421B (dimensions in mm)
1 2
3
4
5
6
S1 S2
auxiliary switches
24 Vac / 5 (3) A
Fig. 6. Accessories
Manufactured for and on behalf of the Environmental and Combustion Controls Division of Honeywell Technologies Sàrl, Rolle, Z.A. La Pièce 16, Switzerland by its Authorized Representative:
Automation and Control Solutions
Honeywell GmbH
Böblinger Strasse 17
71101 Schönaich / Germany
Phone: (49) 7031 637 - 01
Fax: (49) 7031 637 - 493
http://ecc.emea.honeywell.com
Subject to change without notice. Printed in Germany
EN0B-0416GE51 R0409
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