Installation and service instructions
for contractors
VIESMANN
SDIO/SM1A electronics module
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In conjunction with the Vitotronic control unit and HMU heat management unit
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For controlling and regulating a solar DHW heating system
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Solar functions:
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With central heating backup
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With 2nd cylinder preheating
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With thermostat function
SDIO/SM1A electronics module
6131981 GB 9/2019
Please keep safe.
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