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ML6425, ML7425 SPRING RETURN ELECTRIC LINEAR VALVE ACTUATORS
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
® U.S. Registered Trademark
© 211 Honeywell International Inc.
63-2516—07 M.S. Rev. 07-11
Printed in United States
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
up on decreasing signal. When the valve 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. 15).
CHECKOUT
The actuator can be checked out either directly or by using a
controller.
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.
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.