Cylinder temperature sensor of the boiler control unit
PTC
NTC
B
C
D
E
?
13 14 15 16 17 18 19 20 21
N R2
R1 N L
N
IP 20, l, T40
230 V
50 Hz
A
C
Resistor 20 Ω, 0.25 W (on site)
?
13 14 15 16 17 18 19 20 21
N R2
R1 N L
N
IP 20, l, T40
230 V
50 Hz
C
B
E
D
A
C
Resistor 10 kΩ, 0.25 W (on site)
A
Solar control unit wiring chamber
B
Contactor relay, part no. 7814 681
D
Cylinder temperature sensor of the boiler control unit
E
To the boiler control unit; connection for cylinder temperature sensor
Suppression of DHW cylinder reheating by boiler with the Vitosolic 200
Systems with Vitotronic control units and KM BUS
Control units from the current Viessmann product range are equipped
with the necessary software. When retrofitting an existing system, the
boiler control unit may have to be equipped with a PCB (see
Viessmann pricelist).
Reheating of the DHW cylinder by the boiler will be suppressed by the
solar control unit if the DHW cylinder (consumer 1) is being heated.
In the boiler control unit, coding address "67" defaults a third set DHW
temperature (setting range: 10 to 95 ºC). This value must be
below
the first set DHW temperature. The DHW cylinder will only be heated
by the boiler, if the set DHW temperature cannot be achieved by the
solar thermal system.
Systems with additional Viessmann control units
Reheating of the DHW cylinder by the boiler will be suppressed by the
solar control unit if the DHW cylinder (consumer 1) is being heated. A
resistor simulates an actual DHW temperature that is 10 K higher. The
DHW cylinder will only be heated by the boiler, if the set DHW tem-
perature cannot be achieved by the solar thermal system.
Solar control units
(cont.)
VITOSOL
VIESMANN
45
5822 440 GB
10
