ML7425A,B Spring Return Electric Linear Valve Actuator

ML7425A,B Spring Return Electric Linear Valve Actuator
ML7425A,B
Spring Return
Electric Linear Valve Actuator
PRODUCT DATA
FEATURES
• Quick and easy installation.
• No separate linkage required.
• ML7425A extends actuator stem on power failure;
ML7425B retracts actuator stem on power failure.
• Conduit connector is standard.
• No adjustments required.
• True spring return on power failure.
• Accurate valve positioning.
• Low power consumption.
• High close-off ratings.
• Force-limiting end switches.
APPLICATION
The ML7425A,B 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 heating, ventilating, and
air conditioning (HVAC) applications. An internal selector plug
can be used to reverse the direction of action.
• 0 to 10 Vdc or 2 to 10 Vdc signal input.
• Position feedback signal.
• Direct/reverse action.
• Fail-safe position selection.
• Synchronous motor.
• Corrosion resistant design.
• Maintenance free.
Contents
Application ........................................................................
Features ............................................................................
Specifications ....................................................................
Ordering Information .........................................................
Installation .........................................................................
Operation ..........................................................................
Checkout ...........................................................................
® U.S. Registered Trademark
Copyright © 1996 Honeywell Inc. • All Rights Reserved
X-XX UL
1
1
2
2
3
7
8
63-2518-1
ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR
Maximum Valve Medium Temperature:
300°F (150°C)
SPECIFICATIONS
Models:
Model
Description
Spring Return Action
ML7425A
Electric Linear
Valve Actuator
Extends actuator stem
on power failure
ML7425B
Humidity:
5 to 95 percent relative humidity, noncondensing
Close-off Pressure Ratings:
See Tables 1 and 2.
Retracts actuator stem
on power failure
Protection Standard:
IP54
Electrical Ratings:
Power Input: 24 Vac (+10%, -15%), 60 Hz
Power Consumption: 12 VA maximum at 24 Vac
Insulation:
Class II (24 Vac)
Signal Inputs:
0 to 10 Vdc or 2 to 10 Vdc
Approvals:
UL94-5V Flame Retardant
Meets CE standards
Signal Source Output Resistance:
1K ohm maximum
Cable Entry:
Conduit connector and one knockout are standard on
actuator case.
Load:
1 mA maximum
Stem Force:
135 lbf (600N)
Actuator Material:
Cover: ABS-FR plastic
Yoke and Base: Diecast aluminum
Actuator Stroke:
3/4 in. (20 mm)
Weight:
5.1 lb (2.3 kg)
Actuator Run Time at 60 Hz:
ML7425A: 90 seconds
ML7425B: 90 seconds
Dimensions:
See Fig. 1.
Accessories:
43191679-112 Single Auxiliary 220 ohm Potentiometer for
ML7425A/B
43191679-111 Single Auxiliary 10K ohm Potentiometer for
ML7425A/B
43191680-105 Dual Auxiliary Switch for ML7425A,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).
Spring Return Time:
12 seconds
Ambient Temperature Range:
14°F to 122°F (-10°C to +50°C)
Storage Temperature Range:
-40°F to +158°F (-40°C to +70°C)
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 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 2C9.
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.
63-2518—1
2
ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR
Table 1. Close-off ratings in psi for ML7425A,B Electric Linear Valve Actuators and V5011, V5013 Valves.
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.
V5011A
Flange
N/A
N/A
N/A
N/A
N/A
N/A
28
16
V5011F
Screw
150
150
150
145
86
49
28
16
V5011G
Screw
150
150
150
134
77
49
28
16
V5013B
Flange
N/A
N/A
N/A
N/A
N/A
N/A
21
14
V5013C
Flange
N/A
N/A
N/A
N/A
N/A
N/A
21
14
V5013F
Screw
150
150
150
126
77
49
N/A
N/A
Table 2. Close-off ratings in psi for ML7425A,B Electric
Valve Actuators and V3350,1; V3360,1;
V3450,1; V3460,1 Valves.
5-5/15 6-5/16
(135) x (161)
Valve Model
2-11/16
(67)
V3350, V3351,
V3360, V3361,
V3450, V3451,
V3460, V3461
a
Valve Size in in.
2-1/2
3
4
5
6
Close-Off
Rating psi (kPa)a
135 lbf (600 N)
21 (145)
14 (97)
—
—
—
Represents maximum pressure difference between the
outlet and either of the two inlets.
14-5/16
(364)
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.
11-1/4
(284)
1/2 (13) FPT
7-5/8
(192)
YOKE
DIAMETER
1-3/8 (35)
CAUTION
Disconnect power before installation to prevent
electrical shock or equipment damage.
Location
M7892
Install the actuator in a location that allows enough clearance
for mounting accessories and for servicing. See Fig. 1.
Fig. 1. Approximate dimensions of ML7425A,B
Electric Linear Valve Actuator in in. (mm).
CAUTION
Do not install the actuator in a position below
horizontal to minimize risk of damage to actuator in
the event of condensation or a valve gland leak.
Mounting
A Place the actuator on the valve with the U-bolt around
the valve collar. See Fig. 2.
3
63-2518—1
ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR
E Release the stem button retaining clip to secure the
stem button. Check to make certain the stem button is
secured by the retaining clip.
F Remove the cover from the actuator, using a Phillips or
crosspoint screwdriver. See Fig. 4.
CAUTION
The manual spring handle is under tension and can
turn quickly when lifted, pinching fingers between the
handle and plastic casing, which can result in injury.
Maintain handle orientation while lifting and remove
fingers quickly when releasing.
G Remove manual spring handle retaining clip and lift and
release the handle. See Fig. 5. The easiest way to
safely perform this operation is to:
— remove the retaining clip, then
— wedge a small, flat-bladed screwdriver under the
manual spring handle at the point marked in Fig. 5
and pry up the handle.
M6632
Fig. 2. Attaching the actuator to the valve collar.
B Place the U-bolt against the valve collar and secure the
actuator to the valve by turning each U-bolt nut
clockwise. 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.
C Push aside the stem button retaining clip and hold. See
Fig. 3.
M6627
Fig. 4. Removing ML7425 cover.
M6633
Fig. 3. Securing ML7425 to valve.
D 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.
63-2518—1
M6629
Fig. 5. Removing spring retaining clip and
releasing manual spring handle.
4
ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR
ML7425
Wiring
CAUTION
Disconnect power supply before starting wiring to
prevent electrical shock or equipment damage.
WIRING
STRIP
2
F
F
+
–
+
INPUT
(FEEDBACK)
OUTPUT
3
–
T2
T1
All wiring must comply with local electrical codes, ordinances
and regulations. Voltage and frequency of the transformer
used with the ML7425 must correspond with the
characteristics of the power supply and those of the actuator.
See Fig. 7 through 11 for typical wiring hookups.
O1
O2
TS
A Feed power and control wires through the conduit
connector located on the bottom of the actuator case.
See Fig. 6.
L1
(HOT)
L2
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL FEEDBACK SECTION.
3
0-10 Vdc OR 2-10 Vdc CONTROL SIGNAL (SEE W2).
C8286A
Fig. 7. ML7425 wiring diagram using feedback output
from another controller with one transformer.
ML7425
WIRING
STRIP
SENSOR
1
2
3
4
5
6
F
M6630
L1
(HOT)
L2
1
+
–
Fig. 6. Connecting power and control wiring to ML7425.
T2
CAUTION
DUAL
TRANSFORMERS
3
2
1
T1
O1
If conduit connector is to be removed, use a wrench to
support the metal connector when tightening or
removing the conduit pipe.
O2
TS
T775
(WITH 2-10 VDC OUTPUT)
L1
(HOT)
L2
1
B Using the wiring diagrams in Fig. 7 through 11, connect
power and control wires to the ML7425. Make sure that
all wiring is correct.
C When wiring is complete, replace the cover on the
ML7425. See Fig. 12.
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M7894
Fig. 8. ML7425 wiring diagram using a 2 to 10 Vdc output
control (e.g., T775) with two transformers.
NOTE: Make the selector plug changes, if required,
before replacing the cover. See Fig. 13.
ML7425
D Apply power and control signals to the ML7425.
WIRING
STRIP
SENSOR
1
2
3
4
5
6
F
L1
(HOT)
L2
1
+
–
T2
3
2
1
T1
SINGLE
TRANSFORMER
40 VA 24 VAC
O1
O2
TS
1
T775
(WITH 2-10 VDC OUTPUT)
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M7895
Fig. 9. ML7425 wiring diagram using a 2 to 10 Vdc output
control (e.g., T775) with one transformer.
5
63-2518—1
ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR
ML7425
WIRING
STRIP
SENSOR
1
2
3
4
5
6
F
L1
(HOT)
L2
1
+
–
T2
DUAL
TRANSFORMERS
3
2
1
T1
O1
500 OHM
RESISTOR
O2
TS
T775
(WITH 4-20 MA OUTPUT)
L1
(HOT)
L2
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
M7896
Fig. 10. ML7425 wiring diagram using a 4 to 20 mA output
control (e.g., T775) with two transformers.
ML7425
WIRING
STRIP
SENSOR
1
2
3
4
5
M6628
6
F
L1
(HOT)
L2
1
+
–
T2
Fig. 12. Replacing cover on ML7425.
Auxiliary Potentiometers
DUAL
TRANSFORMERS
3
2
The 43191679 Auxiliary Potentiometers can be used as
feedback potentiometers and to provide remote indication of
the valve position. See the installation instructions packed
with the potentiometers.
1
T1
O1
O2
TS
T775
(WITH 2-10 VDC OUTPUT)
L1
(HOT)
L2
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Auxiliary Switches
The 43191680 Dual Auxiliary Switch can be used on both the
ML7425A and ML7425B 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.
M7894
Fig. 11. ML7425 wiring diagram using a 4 to 20 mA output
control (e.g., T775) with one transformer.
CAUTION
Use the 43191680 Dual Auxiliary Switch only with
24 Vac applications.
63-2518—1
6
ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR
OPERATION
Output Signal Feedback (F)
General
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.
In the ML7425, 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.
When the actuator 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.
An integrated spring package limits the stem force to a
factory-adjusted value in either direction. Installed
microswitches turn off the actuator when the specified stem
force is reached.
Actuator Override
The converter output signal override function can be used in
freeze protection or similar applications. It forces the actuator
to a specific position, overriding the control signal. To exercise
this function, disconnect the 24 Vac common from the
actuator (⊥ or T2) and connect it to either Terminal O1 or O2.
Connecting to Terminal O1 fully extends the actuator stem.
Connecting to O2 fully retracts the actuator stem.
The ML7425A,B Spring Return Valve Actuators provide a
safety valve position in event of power failure. On power
failure, the ML7425A returns the stem to the bottom position.
On power failure, ML7425B returns the stem fully upward.
The ML7425 actuators are shipped from the factory with a
spring handle retaining clip installed, so that the actuator can
be connected to the valve without applying power. This clip is
removed after the actuator is installed on the valve. See
Installation section.
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. 14.
ML7425
WIRING
STRIP
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. Selector plugs W1, W2, and
W3 are positioned on the back side of the internal label
holder. See Fig. 13 for location of the selector plugs.
2
F
F
+
–
+
INPUT
(FEEDBACK)
OUTPUT
–
T1
O1
W1
W3
3
T2
SP3T
OVERRIDE
SWITCH
O2
W2
4
TS
10V
0% 50% 100%
2 ... 10V
0 ... 10V
L1
(HOT)
L2
1
10V
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2
2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL FEEDBACK SECTION.
3
0-10Vdc OR 2-10 Vdc CONTROL SIGNAL (SEE W2).
4
SEE OVERRIDE SECTION FOR DETAILS ON
OVERRIDE OPERATION.
M7906
Fig. 14. Connections for overriding control signal
to drive actuator to a specific position.
M6631
Fig. 13. Location of W1, W2 and W3 selector plugs.
Signal Input Failure
Direction of Action
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
W1 is factory set at the mid-position.
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 up, the output signal from
the feedback (F) function is 0 or 2 Vdc. The output of the
signal does not change when W3 is used to reverse the
action of the actuator. See Fig. 13.
7
63-2518—1
ML7425A,B SPRING RETURN ELECTRIC LINEAR VALVE ACTUATOR
Controller Checkout
CHECKOUT
The ML7425 Electric Linear Valve Actuator can be checked
out either directly or by using a controller.
Direct Checkout
A Mount the actuator for the required application (see
Installation section).
B Check the valve position and make sure that 24 Vac is
correctly applied to the actuator.
C Apply the control signal to the appropriate leadwires to
move the valve in the opposite direction.
D If the actuator does not move, make sure the actuator
is properly installed/wired.
E If the actuator installation and wiring are both correct
and the actuator does not run, replace the actuator.
A Adjust the setpoint of the controller to call for opening
the valve. Observe the actuator.
B If the valve is closed, it should begin to open.
C If the valve remains closed, move the setpoint further
toward the open setting.
D If the valve does not move, check for 24 Vac in the
actuator power input.
E 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.
F If the wiring is correct, 24 Vac is present on the power
input terminals, and the actuator does not run, replace
the actuator.
Home and Building Control
Honeywell Inc.
Honeywell Plaza
P.O. Box 524
Minneapolis MN 55408-0524
Home and Building Control
Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
M2H 2C9
Honeywell Latin American Division
Miami Lakes Headquarters
14505 Commerce Way Suite 500
Miami Lakes FL 33016
Honeywell Europe S.A.
3 Avenue du Bourget
B-1140 Brussels Belgium
Honeywell Asia Pacific Inc.
Room 3213-3225
Sun Hung Kai Centre
No. 30 Harbour Road
Wanchai
Hong Kong
Helping You Control Your World®
63-2518—1 C.H. Rev. 10-96 Printed in U.S.A.
63-2518—1
Printed on recycled paper containing at
8
least 10% post-consumer
paper fibers.
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