The ML7420A / ML7425A,B electric linear valve actuators are for modulating control with controls providing an analog output of 0 to 10Vdc or 2 to 10Vdc. They operate Honeywell’s standard valves in heating, ventilation and air conditioning (HVAC) applications. The direction of movement is reversible by means of an internal selector plug.
This manual describes the Honeywell ML7420A/ML7425A,B electric linear valve actuator, a modulating device for HVAC valves that accepts 0‑10 Vdc or 2‑10 Vdc analog signals. Key features include easy installation, low power consumption, force‑limiting end switches, spring‑return options, manual operation, position feedback, and corrosion‑resistant design.
The document covers wiring diagrams, electrical installation, signal‑failure handling, selector plug settings, accessory options, dimensions, and detailed technical specifications such as temperature limits, supply voltage, stroke, and close‑off force. It also explains manual operation procedures and spring‑return behavior for power‑failure situations.
| Ambient operating temperature | -10 to +50 °C |
|---|---|
| Ambient storage temperature | -40 to +70 °C |
| Medium valve temperature (max) | 150 °C |
| Signal input voltage | 0‑10 Vdc or 2‑10 Vdc |
| Signal source output resistance | 1 kΩ max |
| Position feedback signal | 2‑10 Vdc |
| Load | 1 mA max |
| Protection class | II |
| Ingress protection (IP rating) | IP54 |
| Flame retardant rating | V0 |
| Power consumption | 5‑12 VA |
| Stroke | 20 mm |
| Close‑off force | ≥ 600 N |
| Spring return time | ≈12 s |
It accepts an analog input of 0 to 10 Vdc or 2 to 10 Vdc.