If solar heating is uninterrupted (> 2 h), reheating by the boiler only
occurs if the temperature falls below the 3rd set DHW temperature,
as set at the boiler control unit (at coding address "67") (setting
range 10 to 95 °C). This value must be below the first set DHW tem-
perature.
If the solar thermal system is unable to maintain this set value, the
DHW cylinder is heated by the boiler (solar circuit pump running).
Suppression of DHW cylinder reheating by boiler with the
Vitosolic 100
Systems with Vitotronic control units and KM BUS
Control units from the current Viessmann product range are equip-
ped with the necessary software. When retrofitting an existing sys-
tem, 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 is being heated.
Coding address "67" in the boiler control unit defaults a third set
DHW temperature (setting range 10 to 95 °C). This value must be
below the first set DHW temperature.
If the solar thermal system is unable to maintain this set value, the
DHW cylinder is heated by the boiler (solar circuit pump running).
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 is being heated. A resistor
simulates an actual DHW temperature that is approx. 10 K higher.
If the solar thermal system is unable to maintain the set DHW tem-
perature, the DHW cylinder is heated by the boiler (solar circuit
pump running).
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 LN
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 LN
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 equip-
ped with the necessary software. When retrofitting an existing sys-
tem, 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. If the solar thermal system is
unable to maintain this set value, the DHW cylinder is heated by the
boiler.
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 is only heated by the boiler if the set DHW
temperature cannot be maintained by the solar thermal system.
Solar control units
(cont.)
VITOSOL
VIESMANN
31
5822 440 GB
6
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