Ouman M31C150 electric valve actuator, 3-point, 300 N, 24 V AC, for heating circuits
- Application: heating circuit valve control (Ouman ecosystem)
- Force: 300 N
- Power + control signal: 24 V AC, 50/60 Hz, 3-point
- Running time + IP: 150 s (full 6.5 mm stroke), IP 43
Where Ouman M31C150 is used
This actuator is a typical choice for district heating substations running Ouman controllers (S203, EH-105, C203). It opens or closes an Ouman VD-series 2-way regulating valve based on a 3-point signal from the controller. The "C" letter in the model name indicates the heating application — the hardware and housing colour differentiate it from M31A150 (universal) and M41A15 (higher force, DHW use).
In practice, M31C150 is most often paired with Ouman VD220 (DN20) or VD225 (DN25) valves on the heating branch, where a reliable, budget-friendly and Ouman-controller-compatible actuator is required.
Technical specifications
| Parameter | Value |
|---|---|
| Code | OMA0206 |
| Model | Ouman M31C150 |
| Force | 300 N |
| Running time | 150 s (across 6.5 mm) |
| Stroke | 6.5 mm |
| Power supply | 24 V AC (+10 % / –30 %), 50/60 Hz |
| Power consumption | 0.7 VA |
| Control signal | 3-point control |
| IP rating | IP 43 |
| Fail-safe (safety return) | None (no spring return) |
| Cable length | 1.5 m |
| Ambient temperature | 0 … +60 °C |
| Weight | 0.4 kg |
| Compatible valves | Ouman VD/VG series (VD220, VD225, VG…) |
When to choose Ouman M31C150
- District heating substation heating-branch valve control with an Ouman controller
- Mixing valve actuator on a boiler heating circuit
- When a budget-friendly 3-point solution with 300 N force and a standard 6.5 mm stroke valve is required
- In Ouman controller packages as the heating-branch actuator (instead of the universal M31A150)
- Compatibility: Ouman VD220, VD225, VG series valves; as functional analogues — Honeywell M6410C, Danfoss AMV 20 (300 N, 3-point). For control: Ouman EH-105, S203, EH-800, C203.
B2B delivery and logistics via Amegata.lt
- 24-hour delivery across Lithuania (from our warehouse in Vilnius)
- Competitive B2B pricing — often below market average
- 30-day payment terms for companies (per contract)
- Free technical consultation on actuator/valve pairing
Official Ouman catalogue: oumanshop.com/M31C150
Frequently asked questions
How does M31C150 differ from M31A150?
The internal hardware is similar (300 N, 150 s, 6.5 mm, 24 V AC, 3-point), but M31C150 is positioned as heating-specific ("C" — heating), while M31A150 is universal for heating and DHW (domestic hot water) applications. In Ouman controller packages the M31C150 typically sits on the heating branch, while the DHW branch uses M31A150 or the more powerful M41A15.
Can it replace a Honeywell M6410C or Danfoss AMV 20?
Yes — as a functional analogue. The M31C150 hardware matches the Honeywell M6410C (shared OEM design). Danfoss AMV 20 replacement works from a force and signal standpoint (300 N, 3-point), but the mechanical valve adapter must be verified — Ouman VD-series uses a different adapter than the Danfoss VRB.
What mounting position is allowed?
Mount the actuator vertically above the valve or horizontally. Do not mount the actuator below the valve (motors may be flooded by condensate). IP 43 rating is not suitable for outdoor conditions without extra protection.
Can the 1.5 m power/control cable be extended?
Yes. Extend the cable in a junction box while respecting 24 V AC voltage-drop limits. In practice, up to 20-30 m of additional wire (0.75-1.5 mm² cross-section) does not affect operation; for longer runs, check the total resistance drop.
Does M31C150 have a safety return (fail-safe) function?
No. M31C150 has no spring return — on power loss the actuator stays in its last position. If the project requires an automatic return to a safe position (e.g. closed on the DHW branch), select an actuator with an "SR" (spring return) marking — Ouman VD-series compatible alternatives or Belimo/Siemens spring-return lines.
