Viessmann D2RA, Installation Instructions For Contractors

Page: 67 / 164

67
Coding in the delivered condition Possible change
Extended solar control functions
20:0 No extended control function ena-
bled 20:1 Auxiliary function for DHW heating
20:2 Differential temperature control 2.
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
"Heating circuit"
Select "Heating circuit ..." (see page 63).
Coding
Coding in the delivered condition Possible change
Economy function outside temperature
A5:5 With heating circuit pump logic
function (economy control): Heat-
ing circuit pump is "OFF" when the
outside temperature (OT) is 1 K
higher than the set room tempera-
ture (RT
set
)
OT > RT
set
+ 1 K
A5:0 Without heating circuit pump logic
function
A5:1
to
A5:15 With heating circuit pump logic func-
tion: heating circuit pump "OFF"
(see the following table)
Parameter address A5:... With heating circuit pump logic function: heating circuit pump "OFF"
1 OT > RT
set
+ 5 K
2 OT > RT
set
+ 4 K
3 OT > RT
set
+ 3 K
4 OT > RT
set
+ 2 K
5 OT > RT
set
+ 1 K
6 OT > RT
set
7
to OT > RT
set
–
1 K
15 OT > RT
set
–
9 K
Code 1
"Solar"
(cont.)
5678 044 GB
Codes