Viessmann VITOLADENS 300-W Installation And Service Instructions Manual page 80

Code 2
Solar
(cont.)
Coding in the delivered condition
■ Target temperature
control switched on
(code "10:1"):
Temperature at which
the solar heated water
in the DHW cylinder is
to be stratified.
■ Code "20:9" (heating of
two DHW cylinders) is
selected:
When one DHW cylin-
der reaches its set
DHW temperature, the
second DHW cylinder
is heated.
12:20 Minimum collector tem-
perature (minimum start
temperature for the solar
circuit pump) 20 °C.
20:0 No extended control func-
tions enabled.
80
Possible change
12:0 No minimum limit enabled.
12:1 Minimum collector temper-
to ature adjustable from 1 to
12:90 90 °C.
20:1 Additional 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 ad-
ditional temperature sen-
sor.
20:8 Solar heating via external
heat exchanger with addi-
tional temperature sensor.
20:9 Solar heating of two DHW
cylinders.