Viessmann Vitocrossal 300 Service Instructions For Contractors page 81

Solar
(cont.)
Coding in the delivered condition
12:20 Minimum collector tem-
perature 20 °C.
The solar circuit pump is
not started until the mini-
mum collector tempera-
ture set at the collector
temperature sensor is
exceeded.
20:0 No extended control func-
tions enabled
22:8 Start temperature differ-
ential for central heating
backup: 8 K.
Switching output sS is
switched on when the
temperature at sen-
sor / exceeds the tem-
perature at sensor aÖ by
the selected value.
Possible change
12:0 Minimum collector temper-
ature function switched off
12:1 The minimum collector
to temperature is adjustable
12:90 from 1 to 90 °C
20:1 Auxiliary function for DHW
heating
20:2 Differential temperature
control 2
20:3 Differential temperature
control 2 and auxiliary func-
tion
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 exchanger without
additional temperature
sensor
20:8 Solar heating via external
heat exchanger with addi-
tional temperature sensor
20:9 Solar heating of two DHW
cylinders
22:2 Start temperature differen-
to tial for central heating
22:30 backup is adjustable from 2
to 30 K
Code 2
81