Description
Introduction
The Möhlenhoff OEM Alpha direct display 24 V is a precise and user-friendly room thermostat with a clear digital display. Thanks to the intuitive push-turn dial with fine adjustment, the user can easily set the desired temperature. The clear, language-neutral symbols make operation even more accessible. In addition, this thermostat integrates seamlessly with the OEM Actuator 5, ensuring quick installation and reliable operation.
Main benefits
- Digital, language-neutral display with backlighting for easy readability
- Push-turn dial for precise setpoint adjustment (5–30 °C)
- Direct control of OEM Actuator 5 for simple single-room regulation
- Multi-function: heating, cooling, frost protection, and valve protection
- Adjustable setpoint calibration and limiter for maximum control
- Inputs for changeover and time-controlled temperature reduction integrated
- Compact and flat design (86×86×31 mm), durable quality, maintenance-free
Technical specifications
| Feature | Specification |
|---|---|
| Supply voltage | 24 V AC ±20 %, 50 Hz |
| display | Digital LCD with backlighting |
| Setting range | 5–30 °C |
| Control | Push-turn dial with fine detent |
| Control type | PI control according to DIN EN 60730-1 |
| Number of actuators | Up to 5 directly controllable OEM Actuator 5 • NC/NO |
| Functions | Setpoint limiter, calibration, frost and valve protection |
| Inputs | Changeover input • Time-controlled day/night setback |
| Housing | White plastic, 86 × 86 × 31 mm |
| Installation | Surface-mounted or flush-mounted without cable lock |
Available versions
24 V version: Standard with digital display
| Type | Description |
|---|---|
| RD 40203-10N4 | Heating, NC variant, fixed setback temperature, input for setback temperature, switching output indication, setpoint calibration and limiter, valve protection function, switching output switch-off, frost protection, operating lock |
| RD 40203-10N5 | As RD 40203-10N4 but including design panel |
| RD 40203-10N3 | As RD 40203-10N4 but in Jet Black RAL 9005 |
24 V version: Comfort with digital display and heating and cooling function
| Type | Description |
|---|---|
| RD 45203-40N4 | Heating/cooling, NC/NO variant, changeover, selectable heating system, adjustable setback temperature, input for setback temperature, switching output indication, setpoint calibration and limiter, cooling function lockout, valve protection function, switching output switch-off, frost protection, operating lock, backlighting |
| RD 45203-40N5 | As RD 45203-40N4 but including design panel |
| RD 45203-40N3 | As RD 45203-40N4 but in Jet Black RAL 9005 |
24 V version: Controller with digital display and heating and cooling function
| Type | Description |
|---|---|
| RD 45203-60N | Heating/cooling, NC/NO variant, changeover, selectable heating system, Smart Start/Stop, adjustable setback temperature, output for setback temperature, switching output indication, setpoint calibration and limiter, day and night setpoint, cooling function lockout, valve protection function, switching output switch-off, frost protection, operating lock, backlighting |
| RD 45203-60N5 | As RD 45203-60N but including design panel |
| RD 45203-60N3 | As RD 45203-60N but in Jet Black RAL 9005 |
Available options
| Part | Description |
|---|---|
| Design panel | High-quality front panel for the room control device display |
| display | Backlighting for standard version |
Available accessories
| Type | Description |
|---|---|
| ES 1000 | NTC Sensor, 3 m cable, 2 x 0.75 mm², for connection to Alpha direct Control. Temperature Sensor: Cable length / type: 3 m / H03VVH2-F; 2 x 0.75 mm² Operating temperature range: 0 to 50 °C Protection class: IP 67 Max. measuring voltage: 12 V Insulation value: NTC with 22 kOhm at 25 °C ± 2 % Designed for applications with 230 V |
FAQ
Can this thermostat directly control actuators?
As a result, there is no need to add an extra control unit; with a direct connection of up to five OEM Actuator 5 units, users can easily achieve reliable single-room regulation.
What does the Smart Start / Smart Stop function do?
Overall, this function ensures that the actuator only moves when necessary, which reduces wear and lowers energy consumption.
Is cooling also possible?
On the other hand, the Control version offers an integrated changeover input for seamless heating/cooling applications.
Is there a limit on the temperature setting?
Because the setpoint limiter is adjustable, you can prevent end users from going outside the set comfort range.
How is the installation?
Because this thermostat is compact, flat, and easy to install (metric connection without cable lock), installation is very quick and straightforward.
Do you have any questions or would you like more information? Please contact us! You can reach us by phone, email, or, if you prefer, via the chat function.