Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors page 56

Codes
Coding level 2
(cont.)
Coding in the delivered condition
22:8 Start temperature differential with
central heating backup (code
"20:4" must be set) 8 K.
23:4 Stop temperature differential with
central heating backup (code
"20:4" must be set) 4 K.
24:40 Start temperature for thermostat
function (code "20:5" or "20:6"
must be selected) 40 °C.
25:50 Stop temperature for thermostat
function (code "20:5" or "20:6"
must be selected) 50 °C.
26:1 Priority for DHW cylinder 1 with
cyclical heating.
(code "20:9" must be set).
27:15 Cyclical heating time 15 min.
Once the DHW cylinder with priori-
ty is heated up, the DHW cylinder
without priority is heated for a max-
imum duration equal to the set cy-
clical heating time.
28:3 Cyclical pause time 3 min.
After the set cyclical heating time
for the DHW cylinder without priori-
ty has expired, the rise in collector
temperature is captured during the
cyclical pause time.
56
Possible change
20:3 Differential temperature control 2
and auxiliary function.
20:4 Differential temperature control 2 for
central heating backup.
20:5 Thermostat function
20:6 Thermostat function and auxiliary
function
20:7 Solar heating via external heat ex-
changer without additional tempera-
ture sensor
20:8 Solar heating via external heat ex-
changer with additional temperature
sensor
20:9 Solar heating of 2 DHW cylinders
22:2 Start temperature differential adjust-
to able from 2 to 30 K.
22:30
23:2 Stop temperature differential adjust-
to able from 1 to 29 K.
23:30
24:0 Start temperature for thermostat
to function adjustable from 0 to 100 K.
24:100
25:0 Stop temperature for thermostat
to function adjustable from 0 to 100 K.
25:100
26:0 Priority for DHW cylinder 1 without
cyclical heating.
26:2 Priority for DHW cylinder 2 without
cyclical heating.
26:3 Priority for DHW cylinder 2 with cy-
clical heating.
26:4 Cyclical heating without priority for
either DHW cylinder.
27:5 The cyclical heating time is adjusta-
to ble from 5 to 60 min.
27:60
28:1 Cyclical pause time adjustable from
to 1 to 60 min.
28:60