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5693 982 - 04
Vitotronic 300, GW2B Installation and Service
“Solar” Group
(continued)
Code 2
Coding in the factory set condition
Possible change
20:0
No extended control functions enabled.
20:1
Additional 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
exchanger without additional
temperature sensor.
20:8
Solar heating via external heat
exchanger with additional temperature
sensor
20:9
Solar heating of two DHW tanks.
22:8
Start temperature differential for central heating
backup: 8 K.
Switching output
sS
is switched on when the
temperature at sensor
/
exceeds the temperature
at sensor
aÖ
by the selected value.
22:2
to
22:30
Start temperature differential for
central heating backup is adjustable
from 2 to 30 K.
23:4
Stop temperature differential for central heating
backup: 4 K.
Switching output
sS
is switched off when the
temperature at sensor
/
falls below the stop
point. The stop point is the sum of the temperature
at sensor
aÖ
and the value selected for the stop
temperature differential.
23:2
to
23:30
Stop temperature differential for
central heating backup is adjustable
from 1 to 29 K.
24:40
Start temperature for thermostat function 104°F
(40°C).
Start temperature for thermostat function
≤
stop
temperature for thermostat function:
Thermostat function, e.g. for reheating.
Switching output
sS
is switched on when the
temperature at sensor
/
falls below the start
temperature for the thermostat function.
Start temperature for thermostat function > stop
temperature for thermostat function:
Thermostat function, e.g. for utilizing excess heat.
Switching output
sS
is switched on when the
temperature at sensor
/
exceeds the start
temperature for the thermostat function.
24:0
to
24:100
Start temperature for thermostat
function is adjustable from 0 to 100 K.
