Bypass Circuits - Optional Extensions With Vitosolic 200 - Viessmann VITOSOL SERIES Technical Manual

Solar control units
Bypass circuits — optional extensions with Vitosolic 200
To improve the start-up characteristics of the system or for systems
with several collector arrays, we recommend the operation with a
bypass circuit.
Bypass versions
■ With collector temperature and bypass sensor
■ With solar cell
■ With solar cell and collector temperature sensor
Version 1 – bypass circuit with collector temperature sensor and
bypass sensor
9
S1
R R1
S9
R1 Solar circuit pump
R Bypass pump (subject to scheme)
S1 Collector temperature sensor
S9 Bypass sensor
The Vitosolic 200 captures the collector temperature via the collector
temperature sensor. If the set temperature differential between the
collector temperature sensor and the cylinder temperature sensor is
exceeded, the bypass pump is switched ON.
The solar circuit pump is started and the bypass pump is stopped, if
the temperature differential between the bypass sensor and the cylin-
der temperature sensor is exceeded by 2.5 K.
Note
The pump of the Solar-Divicon is used as bypass pump and the pump
for the solar pump line is used as solar circuit pump.
VIESMANN
46
(cont.)
Version 2 – bypass circuit with solar cell (e.g. with an external
heat exchanger)
CS
R1
S1
CS Solar cell
R1 Solar circuit pump
S1 Collector temperature sensor
With this system version, the solar circuit pump also takes on the func-
tion of the bypass pump. The solar control unit records the solar inten-
sity via the solar cell.
The solar circuit pump will be switched ON, if the set insolation thresh-
old is exceeded.
The solar circuit pump will be switched OFF if the insolation level falls
below the selected switching threshold (shutdown delay approx.
2 min).
Version 3 – bypass circuit with solar cell and collector tempera-
ture sensor
CS
R R1
S1
CS Solar cell
R1 Solar circuit pump
R Bypass pump (subject to scheme)
S1 Collector temperature sensor
The solar control unit records the solar intensity via the solar cell. The
bypass pump is started, if the set insolation threshold is exceeded. The
bypass pump is switched OFF and the solar circuit pump will be
switched ON, if the set temperature differential between the collector
temperature sensor and cylinder temperature sensor is exceeded.
The bypass pump will also be stopped, if the insolation level falls below
the selected switching threshold (shutdown delay approx.2.5 min).
Note
The pump of the Solar-Divicon is used as bypass pump and the pump
for the solar pump line is used as solar circuit pump.
VITOSOL