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Source Siemens Climatix POL648.10 HVAC controller 24 VAC/DC 21 I/O Ethernet RS485 KNX Modbus on m.alibaba.com
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SIEMENS Programmable Controller Climatix Controllers POL635.00/STD POL638.00/STD Climatix AHU ext.Module 14 I/O I/O Module POL955.00/STD (POL638.00/STD) : Amazon.com.au: Home Improvement
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