ML4125, ML4135, ML8125, ML8135 FAST-ACTING, TWO-POSITION ACTUATORS
63-2567—3
6
OPERATION
The actuators are operated by an spst two-position controller.
When using an spst two-position controller, the actuator drives
to the damper fully open position when controller contact
makes and spring returns to the damper fully closed position
when controller contact breaks. The actuator drops to holding
power level on detection of stall, independent of hub position.
If power fails, the actuator spring returns to the 0° position.
CHECKOUT
ML4125A,B, ML4135 (120 Vac model)
1.
Check damper position.
2.
Connect 120 Vac to the black and white leadwires to
drive the damper to the open position. The actuator
should drive the damper.
3.
If the actuator does not run, remove power for at least
two seconds.
4.
If the actuator spring returns, allow it to close entirely,
then return to step 2.
5.
If the actuator does not spring return, verify that the
actuator is properly installed. See Installation section.
6.
If the actuator is correctly installed but neither runs nor
spring returns, replace the actuator.
ML4125C,D (230 Vac model)
1.
Check damper position.
2.
Connect 230 Vac to the blue and brown leadwires to
drive the damper to the open position. The actuator
should drive the damper.
3.
If the actuator does not run, remove power for at least
two seconds.
4.
If the actuator spring returns, allow it to close entirely,
then return to step 2.
5.
If the actuator does not spring return, verify that the
actuator is properly installed. See Installation section.
6.
If the actuator is correctly installed but neither runs nor
spring returns, replace the actuator.
ML8125, ML8135 (24 Vac model)
1.
Check damper position.
2.
Connect 24 Vac to the red and black leadwires to drive
the damper to the open position. The actuator should
drive the damper.
3.
If the actuator does not run, remove power for at least
two seconds.
4.
If the actuator spring returns, allow it to close entirely,
then return to step 2.
5.
If the actuator does not spring return, verify that the
actuator is properly installed. See Installation section.
6.
If the actuator is correctly installed but neither runs nor
spring returns, replace the actuator.
