Viessmann SDIO Installation And Service Instructions For Contractors page 17

Configuring the SDIO/SM1A electronics module
23 Stop temperature differential for central heating backup
Display
4 K
... K
24 Start temperature for thermostat function
Display
40 °C
... °C
25 Stop temperature for thermostat function
Display
50 °C
... °C
26 Priority for DHW cylinder
Display
Priority for DHW cylinder 1 – without cycli-
cal heating
Priority for DHW cylinder 1 – with cyclical
heating
Priority for DHW cylinder 2 – without cycli-
cal heating
Priority for DHW cylinder 2 – with cyclical
heating
Cyclical heating without priority for any of
the DHW cylinders
27 Cyclical heating time
Display
15 min
... min
(cont.)
Value Explanations
Parameter "20:4" must be set.
23:4
23:1 to
23:29
Value Explanations
Parameter "20:5" or "20:6" must be set.
24:40
24:0 to
24:100
Value Explanations
Parameter "20:5" or "20:6" must be set.
25:50
25:0 to
25:100
Value Explanations
Parameter "20:9" must be set.
26:0
26:1
26:2
26:3
26:4 Cyclical heating without priority for one of the DHW
cylinders
Value Explanations
The DHW cylinder with priority is heated first. Then
the DHW cylinder without priority is heated for a max-
imum duration equal to the set cyclical heating time.
27:15
27:5 to
27:60
Commissioning
17