Document No. 129-416 
Installation Instructions 
October 5, 2009 
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. Product or company names mentioned herein may be the trademarks of their respective 
owners. © 2009 Siemens Industry, Inc. 
 
Building Technologies Division 
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Buffalo Grove, IL 60089 
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4.  Connect the field wiring to the sensor terminal 
block on the base. See Figures 3 and 4 for 
wiring diagrams. 
5.  Install the sensor onto the Shield as shown. See 
Figure 1 (7). 
The installation is now complete. 
 
Figure 1. Rh/T Outdoor Air Sensor Installation. 
 
 
 
Figure 2.  Field Wiring. 
 
 
 
QFA3101 
Figure 3.  Wiring Diagrams for RH Sensors. 
 
QFA3171/QFA4171 
Figure 4.  Wiring Diagrams for RH/T Sensors.