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Wiring Diagrams, Continued
Figure 2. RDU50U
Figure 4. RDX42.22U
Four-pipe System Wiring.
Figure 6. Heating/Cooling for
RDU50U Only.
Siemens Industry, Inc.
Figure 3. RDU50.2U
Figure 5. RDX42.22U
Heat Pump Wiring.
Figure 7. Heating/Cooling for
RDU20U Only.
Document No. 129-491
Installation Instructions
D1,
Signal input for potential-
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 8.
October 6, 2009
Page 3 of 7
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