Installation Instructions Document No. 129-527 October 22, 2008 Outdoor Air Temperature Sensor Item Number 129-527, Rev. BA 1 Product Description Passive resistance and active output sensors with plastic housing for acquiring outdoor air temperature and to a lesser degree, solar radiation, the wind effect and the temperature of the wall. Product Number Type Product Number Sensing Output Range of Use Passive Resistance QAC2012 Platinum 1K Ω , 385 alpha -58°F to 158°F (-50°C to 70°C) QAC2030 NTC 10K Ω , Type 2 -40°F to 158°F (-40°C to 70°C) Active Output QAC3161 0 to 10 Vdc signal [Platinum 1K Ω ] -58°F to 122°F (-50°C to 50°C) QAC3171 4 to 20 mA signal [Platinum 1K Ω ] -58°F to 122°F (-50°C to 50°C) Required Tools • Drill • Screwdriver • 3/16-inch mounting screws Expected Installation Time 30 minutes Installation Depending on the use, the outdoor air temperature sensor must be located as follows: • For control: The QAC31x1 units may be used as room sensors where the normal conditions in the room would be too harsh for a normal room sensor (for example: animal labs, storage facilities requiring periodic wash-downs, and so on). • For optimization: Always on the coldest wall of the building (normally the wall facing north). The sensor must never be exposed to the morning sun. Mounting Height Mount the unit in the middle of the building, or heating zone, and at least 8 feet (2.5 m) above the ground. Do not mount the sensor at the following locations: • Above windows, doors, air exhausts or other heat sources. • Below balconies or eaves. Mounting Notes • To prevent measuring errors due to air circulation, seal the cable conduit at the sensor. • Do not paint over the sensor. • Mounting instructions are printed on the packaging. The installation is now complete. Wiring Diagrams Figure 1. Passive Resistance Elements (QAC20xx). Figure 2. Active Output Sensors (QAC31x1). Document No. 129-527 Installation Instructions October 22, 2008 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. Products or company names mentioned herein may be the trademarks of their respective owners. © 2008 Siemens Industry, Inc. Siemens Industry, Inc. Building Technologies Division 1000 Deerfield Parkway Buffalo Grove, IL 60089 + 1 847-215-1000 Your feedback is important to us. If you have comments about this document, please send them to SBT_technical.editor.us.sbt@siemens.com Document No. 129-527 Printed in the USA Page 2 of 2 Dimensions In Inches (Millimeters) Figure 2. Passive Resistance Sensors. Figure 3. Active Output Sensors. Next >