Viessmann VITOSOLIC 200 Installation And Service Instructions Manual page 27

System example 4
Function description
DHW heating with solar energy
Solar circuit pump R1 eE starts and
DHW cylinder qP is heated up if the tem-
perature differential between collector
temperature sensor S1 eQ and cylinder
temperature sensor S2 qQ is greater
than the start temperature differential
ΔTon.
Solar circuit pump R1 eE is stopped in
accordance with the following criteria:
■ Actual temperature dropping below
the stop temperature differential ΔToff
■ Exceeding the electronic temperature
limit of control unit eZ (max. 90 °C)
■ Reaching the temperature selected at
high limit safety cut-out qW (if installed)
Additional function for DHW heating
The requirements for the additional func-
tion are achieved through circulation
pump R5 qT.
Suppression of DHW cylinder reheat-
ing by the boiler
Coding address "67" in boiler control
unit 2 defaults a third set DHW tem-
perature (setting range 10 to 95 °C). This
value must be below the first set DHW
temperature. DHW cylinder qP will only
be heated by boiler 1 (solar circuit
pump R1 eE runs) if this set value cannot
be achieved by the solar thermal sys-
tem.
(cont.)
DHW heating without solar energy
The upper section of DHW cylinder qP
is heated by boiler 1. The cylinder ther-
mostat with cylinder temperature sen-
sor 3 of boiler control unit 2 regulates
circulation pump for cylinder heat-
ing 4.
Swimming pool water heating by
solar energy
If the DHW cylinder qP cannot continue
to be heated, the system checks whether
the swimming pool tP can be heated.
Circulation pump R4 eT starts if the tem-
perature differential between collector
temperature sensor S1 eQ and temper-
ature sensor S4 tW is greater than start
temperature differential ΔT2on. The
pump stops if the actual temperature
falls below the stop temperature differ-
ential ΔT2off or if the set swimming pool
temperature Tcyl2set has been
reached.
Circulation pump R4 eT is stopped
roughly every 30 minutes for approx.
7 minutes (times adjustable), to check
whether the temperature at collector
temperature sensor S1 eQ is high
enough to change over to DHW cylinder
heating qP.
The circulation pump for heating swim-
ming pool water R3 tE starts if the tem-
perature differential between tempera-
ture sensor S3 tT and temperature sen-
sor S4 tW is greater than start tempera-
ture differential ΔT5on and start temper-
ature differential Th2on has not been
reached. The pump stops if the actual
temperature falls below the stop temper-
ature differential ΔT5off or if the stop
temperature Th2off has been reached.
System examples
27