Belimo SY4-120MFT Valve Actuator
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The Belimo SY4‑120MFT is a 120 VAC, NEMA 4‑rated electric valve actuator designed for 2–24 in. butterfly valves with a 2‑10 VDC control input and two SPDT auxiliary contacts. Common failure points in this class include power supply degradation (transformer or rectifier), gear wear or misalignment, and controller signal loss or overload on the feedback line. First‑check steps: verify the 120 VAC supply voltage and polarity at the actuator terminals; confirm the 2–10 V control signal is within spec and that the auxiliary contacts are not shorted; inspect the gear train for visible wear or obstruction and review any error codes from the building management system.[oss-gpt-20b] |
Need your Belimo repaired or tested?
We specialize in the repair and refurbishment of high-end industrial control electronics and power systems like this unit.
- ⚙️ Fast Diagnostics – Same-day evaluation available
- 🔁 Reliable Turnaround – Most jobs ship within 5–10 business days
- 🧰 Expert Technicians – Decades of board-level experience
- ✅ 1-Year Warranty – Every repair fully guaranteed
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Belimo SY4-120MFT Valve ActuatorContact Us
🚑Shop Location🛠️
Industrial Electronic Repair
145 Rockwell Place Ct
Tobaccoville, NC 27050
🚑 Rush repair shipments only — no walk-ins.
📞Phone
📦Mailing Address🚛
Industrial Electronic Repair
931-E S. Main St #204
Kernersville, NC 27284
📦 Mailing Address (for invoices or shipped repairs)
No walk-ins accepted.