Viessmann Vitosol
100 Technical Manual page 85

Bypass circuit
To improve the start−up characteristics of
the system or for systems with several
collector arrays, we recommend
operation with a bypass circuit.
Version 1 Bypass circuit with collector temperature sensor and bypass sensor
Vitosolic 200 measures the collector
temperature via the collector temperature
sensor. The bypass circuit pump is
switched ON if the set temperature
difference between the collector
temperature sensor and the cylinder
temperature sensor is exceeded.
B
D C
A
E
F
VL
VITOSOL
The solar circuit pump is switched OFF if
the temperature differential between the
bypass sensor and the cylinder
temperature sensor is exceeded by 2.5 K.
If this differential drops below 1.5 K and
A Solar control unit
B Collector temperature sensor
C Solar pump line
D Solar Divicon
E Circulation pump, bypass circuit
F Bypass sensor
RL
4.8 Additional Vitosolic 200 functions
the start−up temperature differential
continues to be exceeded, then the solar
circuit pump is switched OFF and the
bypass pump is switched ON.
Note
The Solar Divicon pump is used as the
bypass circuit pump and that of the solar
pump line as the solar circuit pump.
85