Honeywell ML7421A1032 Product Data page 4

ML7421A,B ELECTRIC LINEAR VALVE ACTUATOR
2. Push the stem button retaining clip and hold.
See Fig. 3.
Fig. 3. Attaching actuator to valve stem.
3. Lift the valve stem until the head of the valve stem
button is inside the large slot of the stem button
retaining clip.
4. Release the stem button retaining clip to secure the
stem button.
5. Check to ensure that the retaining clip holds the
stem button in place.
6. Pull of the manual operation knob, loosen the cover
screws, and remove the actuator cover.
Wiring
CAUTION
Disconnect the power supply before wiring to prevent
electrical shock or equipment damage.
All wiring must comply with local electrical codes,
ordinances and regulations. Voltage and frequency of the
transformer used with the ML7421 must correspond with
the characteristics of the power supply and those of the
actuator.
1. Feed the power and control wires through the opening
on the bottom of the actuator case.
2. Using the wiring diagrams in Fig. 4 through 6, connect
the power and control wires to the ML7421. Make sure
that all wiring is correct.
3. When wiring and checkout are complete, replace the
cover, tighten the cover screws, and replace the
manual operator knob, see Fig. 7.
4. Apply cover and control signals to the ML7421.
63-2517-2
Fig. 4. ML7421 typical wiring diagram.
Fig. 5. ML7421 wiring diagram using a 0(2) to 10Vdc
output control (e.g. T7759) with two transformers.
Fig. 6. ML7421 wiring diagram using a 0(2) to 10Vdc
output control (e.g. T7759) with one transformer.
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