Honeywell s User Manual
MS4120F; MS4620F,S; MS8120F,S; S2024-F; S20230-F FAST-ACTING, TWO-POSITION ACTUATORS
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CHECKOUT
MS4120F (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 actu-
ator is properly installed. See Installation section.
6. If the actuator is correctly installed but neither runs nor
spring returns, replace the actuator.
MS4620F,S; S20230-F (230 Vac models)
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 actu-
ator is properly installed. See Installation section.
6. If the actuator is correctly installed but neither runs nor
spring returns, replace the actuator.
MS8120F,S; S2024-F (24 Vac models)
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 actu-
ator is properly installed. See Installation section.
6. If the actuator is correctly installed but neither runs nor
spring returns, replace the actuator.