The burners start only when the DHW cylinder needs reheating (con-
trolled by the cylinder temperature controller).
The respective lower boiler water temperature of each boiler is main-
tained if required.
Heating curve setting (slope and level)
The Vitotronic regulates the system flow temperature and the flow
temperature of the heating circuits with mixer in weather-compensated
mode. For this, the system flow temperature is automatically regulated
to between 0 and 40 K (delivered condition 8 K) above the highest
currently required set flow temperature of the heating circuits with
mixer.
The flow temperature required to reach a specific room temperature
depends on the heating system and the thermal insulation of the build-
ing to be heated.
Adjusting the heating curves matches the system flow temperature
and the flow temperature of the heating circuits with mixer to these
operating conditions.
The upper flow temperature of the heating circuits with mixer is limited
by the temperature controller and the electronic maximum boiler water
temperature limiter of the Vitotronic 100, type GC1B.
0,2
Outside temperature in °C
Boiler water or flow temperature in °C
Slope
2,4
2,6
2,8
3,0
3,2
3,4
90
80
70
60
50
40
30
0 -5 -10 -15 -20
5
10
2,0
2,2
0,4
0,6
0,8
1,0
1,2
1,4
-30
-25
100
110
1,6
1,8
15
20
Specification
Rated voltage
230 V~
Rated frequency
50 Hz
Rated current
6 A~
Power consumption
10 W
Safety category
I
IP rating
IP 20 D to EN 60529
Ensure through design/
installation
Mode of operation
Type 1B to
EN 60 730-1
Permissible ambient temperature
– During operation
0 to +40 °C
Installation in living
spaces or boiler rooms
(standard ambient con-
ditions)
– During storage and transport
−20 to +65 °C
Rated relay output breaking capacity
sÖ
Heating circuit pump
or
Primary pump, cylinder loading sys-
tem
4(2) A, 230 V~
sA
Circulation pump for cylinder heat-
ing
4(2) A, 230 V~
sK
DHW circulation pump
4(2) A, 230 V~
sL
Shunt pump/distribution pump
4(2) A, 230 V~
gÖ
Central fault message
4(2) A, 230 V~
gS
Mixer motor, extension kit, mixer
or
Motor, 3-way mixing valve, constant
return temperature raising
or
Motor, 3-way mixing valve, cylinder
loading system
0.2 (0.1) A, 230 V~
Total
Max. 6 A, 230 V~
Dimensions
297
584
108
172
B
A
A
B
A
Vitotronic 300-K
B
Mounting bracket
Delivered condition
■ Control with integral programming unit
■ LON communication module with 2 terminators
■ Outside temperature sensor
■ Flow temperature sensor
■ Cylinder temperature sensor
■ Mounting bracket
■ Bag with technical documentation
The control unit is delivered with one of the boilers of the multi boiler
system (see pricelist) and is fitted with the mounting bracket either to
the wall or the side of the boiler.
Heating system with DHW cylinder
Order separately:
■ Circulation pump with check valve for regulating the cylinder tem-
perature
or
■ Vitotrans 222 cylinder loading system with mixer assembly
Heating system with heating circuit with mixer
A mixer extension kit (accessories) is required for each heating circuit
with mixer.
Control units
(cont.)
68
VIESMANN
Gas condensing boilers
9
5822 449 GB
