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1. Information Disposal of packaging ............................................................................ 8

Symbols ................................................................................................. 8

Intended use .......................................................................................... 8

System examples .................................................................................. 9

Spare parts lists ..................................................................................... 9

2. Installation sequence Overview of electrical connections ........................................................ 10

Power supply ......................................................................................... 11

3. Commissioning Configuring the SDIO/SM1A electronics module ................................... 12

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Automatic detection ............................................................................ 12

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Changing the configured bus system ................................................. 12

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Adjusting the codes/parameters ......................................................... 12

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Configuring the SDIO/SM1A electronics module for KM-BUS (over-

view of coding addresses) .................................................................. 13

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Configuring the SDIO/SM1A electronics module for PlusBus ............ 18

4. Troubleshooting Faults displayed with a fault code .......................................................... 19

Errors without fault code display ............................................................ 19

Repairs .................................................................................................. 19

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Check solar circuit pump at output

................................................ 20

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Check connection at output

........................................................... 20

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Check temperature sensors ............................................................... 20

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Incorrect circulation in the solar circuit ............................................... 21

5. Function description – ver-

sion with SM1

Version with SM1 and KM-BUS (solar DHW heating) ........................... 22

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Solar DHW heating ............................................................................. 22

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Variable speed solar circuit pump ....................................................... 22

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Suppression of DHW cylinder reheating by the heat generator ......... 23

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Suppression of reheating by the boiler in relation to central heating

backup (not in conjunction with heat pumps) ..................................... 23

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Maximum collector temperature ......................................................... 23

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Minimum collector temperature limit ................................................... 23

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Reducing the stagnation time ............................................................. 24

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Target temperature control ................................................................. 24

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Monitoring the flow rate ...................................................................... 24

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Monitoring of night circulation (not in conjunction with heat pumps) .. 24

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Heat statement (solar yield) ................................................................ 24

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Interval function .................................................................................. 24

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Collector frost protection function ....................................................... 25

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Extended functions ............................................................................. 25

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Additional function for DHW heating ................................................... 25

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Differential temperature control 2 ....................................................... 25

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Differential temperature control for central heating backup ................ 25

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Thermostat function ............................................................................ 25

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External heat exchanger ..................................................................... 26

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Cylinder priority control ....................................................................... 26

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Cyclical heating .................................................................................. 26

Relay kick .............................................................................................. 27

6. Function description – ver-

sion with SDIO/SM1A

Version with SDIO/SM1A electronics module and PlusBus ................... 28

■

Solar DHW heating ............................................................................. 28

■

Variable speed solar circuit pump ....................................................... 28

■

Suppression of DHW cylinder reheating by the heat generator ......... 28

■

Maximum collector temperature ......................................................... 28

■

Minimum collector temperature limit ................................................... 29

■

Reducing the stagnation time ............................................................. 29

■

Monitoring the flow rate ...................................................................... 29

■

Heat statement (solar yield) ................................................................ 29

■

Collector frost protection function ....................................................... 29

Index

6131981

Brand	Viessmann
Model	SDIO
Category	Control Unit
Language	English

Viessmann SDIO User Manual

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Viessmann SDIO Specifications

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