Honeywell Automobile Parts ML6425 User Manual

ML6425, ML7425 Spring Return  
Electric Linear Valve Actuators  
PRODUCT DATA  
FEATURES  
ML6425 and ML7425  
Accurate valve positioning.  
Quick and easy installation.  
No separate linkage required.  
On power failure:  
ML6425A and ML7425A drive valve stem down.  
ML6425B and ML7425B draw valve stem up.  
Conduit connector is standard.  
No adjustments required.  
True spring return on power failure.  
Low power consumption.  
High close-off ratings.  
Force-limiting end switches.  
Direct/reverse action.  
APPLICATION  
Synchronous motor.  
The ML6425 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.  
Corrosion resistant design.  
Maintenance free.  
ML7425  
The ML7425 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 heating,  
ventilating, and air conditioning (HVAC) applications. An  
internal selector plug can be used to reverse the direction of  
action.  
Position Feedback signal.  
Fail-safe position selection for control signal loss.  
Contents  
Ordering Information ........................................................  
2
63-2516-07  
 
 
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
Table 1. Close-off Ratings for ML6425, ML7425 Electric Linear Valve Actuators and Honeywell Valves (psi).  
Type  
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.  
Flange V5011A  
28  
21  
16  
14  
V3350/ 3351/ 3450/ 3451  
a
a
V5013B, C; V3360/ 3361/ 3460/ 3461  
21  
28  
14  
16  
b
b
b
b
NPT  
V5011F, G  
77  
49  
150  
150  
230  
100  
150  
150  
150  
230  
100  
150  
150  
150  
163  
100  
150  
134  
145  
104  
100  
126  
V5011H, J  
67  
67  
77  
37  
37  
49  
V5011N1xxx, V5011N3xxx, V5013N  
V5011N2xxx  
V5013F  
a
b
Represents maximum pressure difference between the outlet and either of the two inlets.  
Do not exceed 100 psi with V5011G valves used in steam applications.  
Location  
Install the actuator in a location that allows enough clearance  
for mounting accessories and for servicing.  
5-5/15 6-5/16  
x
14-5/16 (364)  
MINIMUM  
CLEARANCE  
(135)  
(161)  
2-11/16 (67)  
CAUTION  
Equipment Damage Hazard.  
Can damage actuator due to condensation or a  
valve gland leak.  
11-1/4  
(284)  
Install the actuator in a position above horizontal.  
Mounting  
1. Place the actuator on the valve with the U-bolt around  
the valve collar (Refer to Fig. 2).  
2. 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.  
1/2 (13) FPT  
YOKE  
7-5/8  
(192)  
DIAMETER  
1-3/8 (35)  
3. Push aside the stem button retaining clip and hold  
(Refer to Fig. 3).  
4. 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.  
5. Release the stem button retaining clip to secure the stem  
button. Check to make certain the stem button is secured  
by the retaining clip.  
M7892A  
Fig. 1. Approximate Dimensions of ML6425, ML7425  
Electric Linear Valve Actuator in in. (mm).  
6. Remove the cover from the actuator using a Phillips or  
crosspoint screwdriver (Refer to Fig. 4).  
INSTALLATION  
When Installing this Product...  
CAUTION  
Manual spring handle under tension can turn  
quickly when lifted, pinching fingers between  
handle and plastic casing.  
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.  
Personal Injury Hazard.  
Use a screwdriver to lift and release manual spring  
handle (Refer to Fig. 5).  
4. After installation is complete, check out product  
operation as provided in these instructions.  
7. Remove the manual spring handle retaining clip, and lift  
and release the handle (Refer to Fig. 5). The easiest way  
to perform this operation safely is to:  
CAUTION  
a. Remove the retaining clip.  
Electrical Shock or Equipment Damage Hazard.  
Can shock individuals or short equipment circuitry.  
Disconnect power supply before installation.  
b. Wedge a small, flat-bladed screwdriver under the  
manual spring handle and pry up the handle  
(Refer to Fig. 5).  
3
63-2516—07  
 
 
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
M6629  
Fig. 5. Removing Spring Retaining Clip and Releasing  
Manual Spring Handle.  
M6632  
Fig. 2. Attaching Actuator to Valve Collar.  
WIRING  
CAUTION  
Electrical Shock or Equipment Damage Hazard.  
Can shock individuals or short equipment circuitry.  
Disconnect power supply before installation.  
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. Refer to Figures 6 through 13 for  
connection information and typical wiring hookups.  
1. Feed power and control wires through the conduit  
connector located on the bottom of the actuator case  
(See Fig. 6).  
M6633  
Fig. 3. Securing Actuator to Valve.  
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. Using the wiring diagram in Fig. 7, connect power and  
control wires. Make sure that all wiring is correct.  
3. When wiring is complete, replace the cover on the  
actuator (Refer to Fig. 14).  
4. Apply power and control signals to the actuator.  
M6627  
Fig. 4. Removing Actuator Cover.  
M6630  
Fig. 6. Connecting Power and Control Wiring.  
63-2516—07  
4
 
 
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
ML6425A,B  
WIRING  
T6984 (FLOATING CONTROLLER)  
ML7425  
4
2
STRIP  
WIRING  
STRIP  
F
2
MOTOR OPEN  
MOTOR CLOSE  
B
INPUT  
(FEEDBACK)  
OUTPUT  
F
W
24 Vac  
+
T2  
T1  
O1  
O2  
TS  
+
COMMON  
3
T5  
T1  
1
2
POWER SUPPLY. PROVIDE DISCONNECT 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, T5, W, AND B.  
1
3
T
Y
G
L1  
(HOT)  
L2  
3
4
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.  
1
2
3
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
1
2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL  
FEEDBACK SECTION.  
L1  
(HOT)  
0-10 Vdc OR 2-10 Vdc CONTROL SIGNAL. SEE SIGNAL  
INPUT (+) SECTION.  
L2  
C8286B  
MOTOR OPEN SIGNAL DRAWS VALVE STEM  
UPWARDS. MOTOR CLOSE SIGNAL DRIVES  
VALVE STEM DOWNWARDS.  
M25446  
Fig. 9. ML7425 Wiring using Controller Feedback Output  
and a Common Transformer.  
Fig. 7. ML6425 Wiring.  
ML7425A,B  
T7984  
WIRING  
STRIP  
F
(2-10 Vdc  
CONTROLLER)  
2-10 Vdc OUTPUT  
+
ML7425  
Ð
SENSOR  
WIRING  
STRIP  
T2  
T1  
O1  
O2  
TS  
2
2
4
6
1
3
1
5
24 VAC  
1
F
L1  
(HOT)  
L2  
COMMON  
+
T2  
T1  
O1  
O2  
TS  
2
DUAL  
TRANSFORMERS  
1
3
L1  
(HOT)  
L2  
T775  
1
2
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
(WITH 2-10 VDC OUTPUT)  
TS MUST BE POWERED, OR THE ACTUATOR WILL  
SPRING RETURN.  
L1  
(HOT)  
L2  
M17394  
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
Fig. 8. ML7425 Wiring.  
M7894  
Fig. 10. ML7425 Wiring using 2 to 10 Vdc Control Signal  
and Separate Transformers.  
5
63-2516—07  
 
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
SENSOR  
ML7425  
ML7425  
SENSOR  
WIRING  
STRIP  
WIRING  
STRIP  
2
2
4
6
1
3
3
1
5
2
2
4
6
1
3
1
5
1
L1  
(HOT)  
L2  
1
F
F
L1  
(HOT)  
L2  
+
T2  
T1  
O1  
O2  
TS  
+
T2  
T1  
O1  
O2  
TS  
SINGLE  
TRANSFORMER  
40 VA 24 VAC  
SINGLE  
TRANSFORMER  
40 VA 24 VAC  
3
500 OHM  
RESISTOR  
T775  
T775  
(WITH 2-10 VDC OUTPUT)  
(WITH 4-20 MA OUTPUT)  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS  
AND OVERLOAD PROTECTION AS REQUIRED.  
M7895  
M7897  
Fig. 11. ML7425 Wiring using 2 to 10 Vdc Control Signal  
and a Common Transformer.  
Fig. 13. ML7425 Wiring using 4 to 20 mA Control Signal  
and a Common Transformer.  
NOTE: 500 ohm resistor not shipped with product.  
ML7425  
SENSOR  
WIRING  
2
2
4
6
1
3
1
5
STRIP  
1
F
L1  
(HOT)  
L2  
+
T2  
T1  
O1  
O2  
TS  
DUAL  
TRANSFORMERS  
3
500 OHM  
RESISTOR  
T775  
(WITH 4-20 MA OUTPUT)  
L1  
(HOT)  
L2  
1
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
M7896  
M6628  
Fig. 12. ML7425 Wiring using 4 to 20 mA Control Signal  
and Separate Transformers.  
Fig. 14. Replacing Actuator Cover.  
NOTE: 500 ohm resistor not shipped with product.  
63-2516—07  
6
 
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
ML7425  
W3  
W2  
W1  
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 printed circuit board. Refer  
to Fig. 15 for location of the selector plugs.  
50% 100%  
0%  
Signal Input Failure  
Using the potentiometer, the actuator can be set to run to any  
position in event of a signal failure (ML7420/ML7425 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  
M33047  
actuator stem position is available at terminal F. It can be used  
for remote indication of the stem position. When the valve stem  
is fully downward, the output signal is 10 Vdc.  
Fig. 15. Location of W1, W2, and W3 Selector Plugs.  
Auxiliary Potentiometers  
The 43191679 Auxiliary Potentiometers can be used as  
feedback potentiometers and to provide remote indication of  
the valve position. Refer to the Installation Instructions packed  
with the potentiometers.  
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  
Auxiliary Switches  
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.  
CAUTION  
Equipment Damage Hazard.  
Improper voltage will damage the auxiliary switch  
beyond repair.  
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. 16).  
Use the 43191680 Dual Auxiliary Switch only with 24  
Vac applications.  
ML7425  
WIRING  
The 43191680 Dual Auxiliary Switch can be used on both the  
ML6425 and ML7425 Electric Linear Valve Actuators.  
Switching points are adjustable over the full length of actuator  
stroke; for example, the switch can be used to switch pumps or  
provide remote indication of any stroke position. Refer to the  
Installation Instructions packed with the auxiliary switch.  
2
STRIP  
INPUT  
(FEEDBACK)  
OUTPUT  
F
F
+
T2  
T1  
O1  
O2  
TS  
+
3
SP3T  
OVERRIDE  
SWITCH  
OPERATION  
4
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.  
1
L1  
(HOT)  
L2  
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.  
1
2
3
4
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND  
OVERLOAD PROTECTION AS REQUIRED.  
2-10 Vdc FEEDBACK SIGNAL. SEE OUTPUT SIGNAL  
FEEDBACK SECTION.  
The ML6425, ML7425 Spring Return Valve Actuators provide a  
safety valve position in the event of power failure. On power  
failure, the ML6425A and ML7425A extend the actuator stem;  
the ML6425B and ML7425B retract the actuator stem.  
0-10Vdc OR 2-10 Vdc CONTROL SIGNAL. SEE SIGNAL  
INPUT (+) SECTION.  
SEE OVERRIDE SECTION FOR DETAILS ON  
OVERRIDE OPERATION.  
M7906A  
Fig. 16. Connections for Overriding Control Signal to Drive  
ML7425 to a Specific Position.  
The actuators are shipped from the factory with a spring  
handle retaining clip installed, so the actuator can be  
connected to the valve without applying power. Remove this  
clip after the actuator is installed. (Refer to the Installation  
section.)  
7
63-2516—07  
 
 
ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS  
up on decreasing signal. When the valve stem is up, the  
Direction of Action (ML7420/ML7425 only)  
The direction of 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 it  
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. 15).  
CHECKOUT  
The actuator can be checked out either directly or by using a  
controller.  
Controller Checkout  
1. Adjust the setpoint of the controller to call for opening  
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  
toward 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,  
check the voltage across 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.  
Direct Checkout  
1. Mount the actuator for the required application; see  
Installation section.  
2. Check the valve position and make sure that 24 Vac is  
correctly applied to the actuator.  
3. Apply the power to the appropriate leadwires to move  
the valve.  
4. If the actuator does not move, make sure the actuator is  
properly installed/wired.  
5. If the actuator installation and wiring are both correct  
and the actuator does not run, replace the actuator.  
Automation and Control Solutions  
Honeywell International Inc.  
1985 Douglas Drive North  
® U.S. Registered Trademark  
© 211 Honeywell International Inc.  
63-2516—07 M.S. Rev. 07-11  
Printed in United States  
Golden Valley, MN 55422  
customer.honeywell.com  
 
 

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