Siemens RDU50U Technical Instructions
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Siemens RDU50U Technical Instructions

Siemens RDU50U Technical Instructions

With lcd for heating and cooling systems
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RDU20U, RDU50U and
RDU50.2U
Room Temperature Controllers
with LCD for Heating and
Cooling Systems
Description
Features
Application
Product Numbers
The RDU Series Room Controller with LCD is designed for heating and cooling
systems.
• Modulating Proportional + Integral (P+I) control
• Control depending on room or remote air temperature
• Output for a 0 to 10 Vdc actuator (RDU50U and RDU50.2U)
• Output for a floating (3-position) or on/off output actuator (RDU20U)
• Adjustable actuator run time (RDU20U)
• Automatic heating/cooling changeover (RDU20U and RDU50U)
• Manual heating/cooling changeover (RDU50.2U)
• Operating modes: Normal, Energy Saving and Off
• Operating mode changeover input for remote control
• Selectable installation and control parameters
• Adjustable minimum limitation for cooling output
• Optional selectable Direct Acting or Reverse Acting output
• Selectable display of room temperature or setpoint
• Fahrenheit or Celsius selectable
• Minimum and maximum setpoint limitation
• Operating voltage, 24 Vac
• Individual room temperature control in heating or cooling HVAC applications.
• Control of that are heated or cooled.
Product Numbers
RDU20U
RDU50U
RDU50.2U
Technical Instructions
Document No. 155-735
RDU20U and RDU50U
Table 1.
Features
Automatic heating/cooling changeover
Automatic heating/cooling changeover
Manual heating/cooling changeover switch
November 1, 2006
RDU50.2U
Siemens Industry, Inc.

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Summary of Contents for Siemens RDU50U

  • Page 1 • Modulating Proportional + Integral (P+I) control Features • Control depending on room or remote air temperature • Output for a 0 to 10 Vdc actuator (RDU50U and RDU50.2U) • Output for a floating (3-position) or on/off output actuator (RDU20U) • Adjustable actuator run time (RDU20U) •...
  • Page 2 The controller measures the room temperature with its integrated sensor or via a remote return air temperature sensor (QAH11.1) and maintains the setpoint by delivering continuous control commands to the actuators (0 to 10 Vdc [RDU50U and RDU50.2U] or 24 Vac on/off, or three-position [RDU20U]). The controller provides P+I control.
  • Page 3 RDU20U, RDU50U and RDU50.2U Room Temperature Controllers Technical Instructions with LCD for Heating and Cooling Systems Document Number 155-735 November 1, 2006 Function, Continued RDU50U and RDU50.2U Figure 2. Heating Mode, RA. Figure 3. Cooling Mode, RA. (DIP Switch 2 in ON Position) (DIP Switch 2 in ON Position) Figure 5.

  • Page 4: Operating Modes

    The return air temperature measurement overrides the internal measurement automatically if a QAH11.1 cable temperature sensor is connected to input 4–3 (RDU50U and RDU50.2U) or 8–9 (RDU20U). Parameter P12 shows which temperature sensor is currently active.

  • Page 5: Mechanical Design

    RDU20U, RDU50U and RDU50.2U Room Temperature Controllers Technical Instructions with LCD for Heating and Cooling Systems Document Number 155-735 November 1, 2006 Energy Saving Mode A changeover switch can be connected to the dry contact (D1–GND). When the switch closes its contact (due to an open window, for instance), the operating mode will change from normal operation to Energy Saving mode.

  • Page 6: Setting The Control Parameters

    Technical Instructions RDU20U, RDU50U and RDU50.2U Room Temperature Controllers Document Number 155-735 with LCD for Heating and Cooling Systems November 1, 2006 Display of the room or return air Setting and temperature, setpoints, and control Operating Elements parameters Symbol used when displaying the...
  • Page 7 RDU20U, RDU50U and RDU50.2U Room Temperature Controllers Technical Instructions with LCD for Heating and Cooling Systems Document Number 155-735 November 1, 2006 Table 5. Control Parameters. Parameter Meaning Setting Range Factory Setting Setpoint of heating in energy saving mode 61°F (16C) (operating mode changeover switch activated) 41°F to 64°F (5°C to 18C)

  • Page 8: Engineering Notes

    See Figure 12. Figure 12. Accessing the Wire Terminal Block. • Sensor inputs 4–3 and 2–3 (RDU50U and RDU50.2U) and 8–9 and 8–7 (RDU20U) carry 24 Vdc potential. If the sensor's cables must be extended, they must be suited for 24 Vdc voltage.

  • Page 9: Specifications

    RDU20U, RDU50U and RDU50.2U Room Temperature Controllers Technical Instructions with LCD for Heating and Cooling Systems Document Number 155-735 November 1, 2006 Specifications Operating voltage 24 Vac +20% Power Supply Frequency 50/60 Hz Power consumption Maximum 4 VA Control output 1–5 (RDU50U and RDU50.2U)

  • Page 10: Wiring Diagrams

    Remote temperature sensor Signal input for potential-free operating mode changeover Figure 13. RDU20U Wiring Diagram. Figure 14. RDU50U Wiring Diagram. Figure 15. RDU50.2U Wiring Diagram. D1, GND Signal input for potential- free operating mode changeover switch 0 to 10 Vdc output...

This manual is also suitable for:

Rdu50.2uRdu20u

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