Collector Frost Protection Function; Extended Functions; Additional Function For Dhw Heating; Differential Temperature Control 2 - Viessmann SDIO Installation And Service Instructions For Contractors

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

Collector frost protection function

Viessmann collectors are filled with Viessmann heat
transfer medium. Consequently, this function does not
need to be enabled.
Only enable it if water is used as the heat transfer
medium.

Extended functions

The extended functions are set in coding address "20".

Additional function for DHW heating

With the additional function for DHW heating (boiler
circuit control unit function), the solar preheat stage
can be heated at the selected times.
Boiler control unit settings:
■ Set a 2nd set DHW temperature in coding address
"58" or parameter "03" ("DHW" group).
■ Activate a 4th DHW phase for DHW heating.
■ Set the additional function (in conjunction with the
required further function) in coding address "20"
("Solar" group).

Differential temperature control 2

Set code/parameter "20:2" or "20:3".
If the temperature captured by temperature sensor
is higher by a value equal to the selected start/stop
temperature differential (coding address "22" and "23")
than the temperature captured by temperature sensor
aÖ , then output sS will be 'live'.

Differential temperature control for central heating backup

Set code/parameter "20:4".
If the following conditions are met, output
There is a heat demand from one of the connected
■
heating circuits.
■ The temperature captured by temperature sensor
is higher than the temperature captured by tempera-
ture sensor by a value equal to the selected start/
aÖ
stop temperature differential (coding address "22"
and "23").

Thermostat function

Set code/parameter "20:5" or "20:6".
The thermostat function can be used independently of
solar operation.
Function description – version with SM1
To prevent damage to the collectors, the solar circuit
pump is switched on if the collector temperature falls
below +5 °C. The pump is stopped when a tempera-
ture of +7 °C is reached.
See coding address "0B".
Note
Extended control functions can be used only in relation
to the selected system example and the system com-
ponents listed there.
Note
In coding address "56" or parameter "01" ("DHW"
group), the setting range for the DHW set temperature
can be adjusted to between 10 and over 60 °C.
This signal is then relayed via the KM-BUS/PlusBus to
the SDIO/SM1A electronics module. The de-stratifica-
tion pump starts.
/
is 'live':
sS
/
(cont.)
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