25
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.
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".
Extended functions
The extended functions are set in coding address "20". Note
Extended control functions can be used only in relation
to the selected system example and the system com-
ponents listed there.
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).
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.
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
sS
is 'live':
■
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
aÖ
by a value equal to the selected start/
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
Version with SM1 and KM-BUS (solar DHW heating) (cont.)
6131981
Appendix
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