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RDU... and RDX42.22U Room
Temperature Controllers
Product Description
The RDU Series and RDX42.22U Room
Temperature Controller with LCD are designed for
heating and cooling systems.
Product Numbers
RDU20U
Floating output, auto changeover
RDU50U
Modulating output, auto changeover
RDU50.2U
Modulating output, manual changeover
RDX42.22U On/off output, manual changeover
Required Tools
•
Small, flat-blade screwdriver
•
Wire strippers
•
Electric drill
Expected Installation Time
30 minutes
Accessories:
•
141-570 Lockable Thermostat Guard
•
ARG70 Wall Plate Adapter
•
QAH11.1 Remote/Changeover Sensor
Item Number 129-491, Rev. BA
Installation Instructions
Installation
Step 1. Loosen Retaining Screws.
Step 2. Remove Controller Housing.
Step 3. Remove Screw and Open Terminal
Cover. Remove Installation Hardware.
Document No. 129-491
October 6, 2009
Page 1 of 7
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Summary of Contents for Siemens RDU20U
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Page 1: Product Description
Installation Product Description The RDU Series and RDX42.22U Room Temperature Controller with LCD are designed for heating and cooling systems. Product Numbers RDU20U Floating output, auto changeover RDU50U Modulating output, auto changeover RDU50.2U Modulating output, manual changeover RDX42.22U On/off output, manual changeover Step 1. -
Page 2: Wiring Diagrams
Control signal, closing, 24 Vac Changeover, heat/cool input Measuring neutral (sensors) Remote temperature sensor Signal input for potential-free operating mode GND changeover Time clock or switch Damper or valve actuator Figure 1. RDU20U. Page 2 of 7 Siemens Industry, Inc. - Page 3 Heating output, NC contact Fan output at single speed Figure 4. RDX42.22U Figure 5. RDX42.22U Four-pipe System Wiring. Heat Pump Wiring. Figure 8. Figure 6. Heating/Cooling for Figure 7. Heating/Cooling for RDU50U Only. RDU20U Only. Siemens Industry, Inc. Page 3 of 7...
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Page 4: Operating Instructions
The new temperature setpoint will Off (the parameter display shows Off), which automatically be stored 10 seconds after could result in freeze conditions. the last adjustment is made. The display will then stop flashing. Page 4 of 7 Siemens Industry, Inc. -
Page 5: Dip Switch Settings
Installation Instructions October 6, 2009 DIP Switch Settings Normal operation mode Press the + and – buttons simultaneously for Table 1. RDU20U. a minimum of 3 seconds and a maximum of Number Description 5 seconds. Release them and within 2... - Page 6 (0.5 K = °F) Value of current room temperature No setting, display only — Active temperature sensor (display 1: Room temperature sensor active — only, no setting choices) 2: Return temperature sensor active Page 6 of 7 Siemens Industry, Inc.
- Page 7 Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as design improvements are introduced. Teflon is a registered trademark of DuPont. Product or company names mentioned herein may be the trademarks of their respective owners. © 2009 Siemens Building Technologies, Inc.