Heating Circuit 1, Heating Circuit 2, Heating Circuit 3 - Viessmann VITOLADENS 300-W Installation And Service Instructions Manual

Code 1
Solar
(cont.)
Coding in the delivered condition
Extended solar control functions
20:0 No extended control func-
tions enabled

Heating circuit 1, heating circuit 2, heating circuit 3

Coding
Coding in the delivered condition
Economy function outside temperature
A5:5 With heating circuit pump
logic function (economy
control): heating circuit
pump "OFF" when the
outside temperature (AT)
is 1 K higher than the set
room temperature (RT
AT > RT
60
)
set
+ 1 K
set
Possible change
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 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.
Possible change
A5:0 Without heating circuit
pump logic function
A5:1 With heating circuit pump
to logic function: Heating cir-
A5:15 cuit pump "OFF"; see fol-
lowing table