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Phone: +86 16626708626Description
Key Technical Specifications
| Parameter | Value |
| Actuator Type | Electric linear valve actuator with spring return |
| Supply Voltage | 24 VAC \pm 15\%, 50/60 Hz |
| Power Consumption | 12 VA maximum |
| Signal Input Voltage | 0 \dots 10 VDC or 2 \dots 10 VDC (adjustable) |
| Position Feedback Signal | 2 \dots 10 VDC (fully extended) |
| Rated Stem Force | 600 N (135 lbf) |
| Rated Stroke | 20 mm |
| Run Time (50/60 Hz) | Approx. 60 seconds (1 min) |
| Protection Standard | IP54 |
| Ambient Temperature Limits | -10 to +50^\circC (14 to 122^\circF) |
Product Introduction & Supply Chain Strategy
The Honeywell ML7425A8018-E is an electric linear valve actuator engineered for precise modulating control in commercial heating, ventilation, and air conditioning (HVAC) systems. Utilizing an analog control input (0 \dots 10 VDC or 2 \dots 10 VDC), it drives standard Honeywell valves while offering an integrated spring-return mechanism to ensure a defined safety position during sudden power failures.
Sourcing this unit as a Brand New Surplus asset prevents facility downtime risks associated with aged or second-hand controls. Utilizing factory-original actuators guarantees reliable valve positioning, eliminates unexpected calibration drift, and protects Total Cost of Ownership (TCO) across critical environmental control loops.
ML7425A8018-E
Installation & Configuration Guide
- Stage 1: Pre-Installation (Prep & Safety): Perform lock-out/tag-out (LOTO) protocols on the 24 VAC supply and associated control loops. Verify valve stem travel requirements and inspect the mounting bracket. Use an ESD grounding strap if handling internal configuration jumpers. Take reference photos of internal DIP switch/potentiometer settings prior to adjustments.
- Stage 2: Removal: Disconnect the conduit fitting and wiring terminals from the legacy actuator. Loosen the stem retainer mechanical connection carefully to avoid side-loading or bending the valve stem. Unbolt the base yoke from the valve bonnet.
- Stage 3: Installation (Clone & Seat): Mount the ML7425A8018-E onto the valve bonnet, ensuring proper alignment of the button-keyed retainer connection to the valve stem. Secure mounting fasteners evenly. Reconnect field wiring to the terminal block, ensuring proper ground shielding and M20 cable gland strain relief.
- Stage 4: Power-On & Testing: Restore 24 VAC power to initiate the automatic self-adaptation mode (where the actuator measures full stroke boundaries). Monitor the LED status indicators to verify normal operation, test modulating command responses from the building management system (BMS), and check the 2 \dots 10 VDC position feedback signal.
Firmware/Software Versions & Upgrade Notes
- Recommended Baseline: Factory-configured with standard analog scaling (2 \dots 10 VDC default input/output mapping).
- Compatibility Notes: Ensure controller analog output cards match the impedance and signal range configuration of the actuator (Ri = 100 k\Omega). Adjust onboard potentiometers (W1/W3) for direct or reverse action scaling depending on application fail-safe requirements.
- Upgrade Warning: Do not hot-swap controller signal wire assignments while the transformer is energized to prevent transient feedback loops on the internal microprocessor board. Always verify input scaling jumpers match plant loop specifications.
Frequently Asked Questions (FAQ)
- Are these actuators truly new or refurbished?
This unit is a Brand New Surplus part. It is supplied in original factory packaging, completely unused, and has never been installed or repaired.
- Why choose New Surplus over a cheaper refurbished unit?
Refurbished HVAC actuators frequently contain fatigued internal spring mechanisms, worn gear trains, or degraded electronic capacitors. Saving nominal budget on a used unit risks catastrophic HVAC valve failure during an emergency shutdown event.
- What is the strategic inventory recommendation for this part?
For mission-critical mechanical rooms, keeping 1 unit of the ML7425A8018-E on-site as buffer stock guarantees rapid swap-out capabilities during sudden control failures.
- What happens to the valve during a power failure?
The integrated true spring-return mechanism automatically drives the actuator to its predefined safety position (stem extends or retracts depending on model and configuration setup) when 24 VAC power drops.
- What warranty terms are included?
Every New Surplus ML7425A8018-E unit is backed by a robust 1-to-2 year operational warranty, assuring complete reliability for building automation deployments.
