Siemens RDU20U, RDU50U, RDU50.2U, RDX42.22U Installation Instructions Manual

Installation Instructions
Document No. 129-491
October 6, 2009
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
Installation
Step 1. Loosen Retaining Screws.
Accessories:
141-570 Lockable Thermostat Guard
ARG70 Wall Plate Adapter
QAH11.1 Remote/Chan geover Sensor
Item Number 129-491, Rev. BA Page 1 of 7
Step 2. Remove Controller Housing.
Step 3. Remove Screw and Open Terminal
Cover. Remove Installation Hardware.
Document No. 129-491 Installation Instructions October 6, 2009
Installation, Continued
Step 4. Mount Base Plate to Wall.
Step 5. Terminate Wires (See Wiring Diagrams),
Close Cover Terminal Cover and Replace Screw.
Step 6. Set DIP Switches.
Step 7. Replace Controller Housing.
Step 8. Tighten Retaining Screws.
Wiring Diagrams
Figure 1. RDU20U.
Page 2 of 7 Siemens Industry, Inc.
The installation is now complete.
1 Operating voltage, 24 Vac negati ve 2 Operating voltage, 24 Vac positiv e 3 Operating voltage, 24 Vac positiv e 4 Control signal, opening, 24 Vac 6 Control signal, closing, 24 Vac 7 Changeover, heat/cool input 8 Measuring neutral (sensors) 9 Remote temperature sensor D1, Signal input for potential-free operating mode GND changeover S1 Time clock or switch Y1 Damper or valve actuator
Wiring Diagrams, Continued
D1, Signal input for potential-
Figure 2. RDU50U
Figure 4. RDX42.22U
Four-pipe System Wiring.
Figure 3. RDU50.2U
Figure 5. RDX42.22U
Heat Pump Wiring.
Document No. 129-491
Installation Instructions
October 6, 2009
GND free operating mode changeover switch 1 0 to 10 Vdc output 2 Heat/cool changeover sensor input 3 Measuring neutral 4 Remote temperature sensor input 6* Operating voltage, 24 Vac Negative 5* Ground for control signal 7 Operating voltage, 24 Vac Positive
* 5 and 6 are connected internally
D1, Signal input for potential- free GND operating mode changeover 1,2,3 Operating voltage, 24 Vac Negative 4 Operating voltage, 24 Vac Positive 5 Cooling output, NO contact 6 Cooling output, NC contact 7 Auxiliary heating output 8 Measuring neutral remote sensor 9 Remote temperature sensor (QAH11.1) 10 Heating output, NO contact 11 Heating output, NC contact 12 Fan output at single speed
Figure 6. Heating/Cooling for
RDU50U Only.
Siemens Industry, Inc. Page 3 of 7
Figure 7. Heating/Cooling for
RDU20U Only.
Figure 8.
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