Heating Circuit 1, Heating Circuit 2, Heating Circuit 3/Group "5 - Viessmann VITOCROSSAL Service Instructions Manual

Code 1
Solar/Group "4"
(cont.)
Coding in the delivered condition
Extended solar control functions
20:0 No extended control function ena-
bled

Heating circuit 1, heating circuit 2, heating circuit 3/Group "5"

For weather-compensated control units, select "Heat-
ing circuit..." (see page 36).
Coding
Coding in the delivered condition
Priority DHW heating
A2:2 Cylinder priority applicable to heat-
ing circuit pump and mixer
Economy function outside temperature
A5:5 With heating circuit pump logic
function (economy mode): Heating
circuit pump "OFF" when the out-
side temperature (OT) is 1 K high-
er than the set room temperature
(RT
set
OT
>
compensated control units)
Parameter address A5:...
1
2
3
4
5
40
)
RT + 1 K (only for weather-
set
With heating circuit pump logic function: Heating circuit pump "OFF"
OT RT + 5 K
>
set
OT RT + 4 K
>
set
OT RT + 3 K
>
set
OT RT + 2 K
>
set
OT RT + 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 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
For constant temperature control units, select Group
"5" (see page 36).
Possible change
A2:0 Without cylinder priority applicable to
heating circuit pump and mixer
A2:1 Cylinder priority only applicable to
mixer
A2:3 Reduced priority applicable to mixer:
to The heating circuit receives a re-
A2:15 duced amount of energy.
A5:0 Without heating circuit pump logic
function
A5:1 With heating circuit pump logic func-
to tion: Heating circuit pump "OFF"
A5:15 (see the following table)