Viessmann VITOSOLIC 200 Installation And Service Instructions Manual page 36

System examples
System example 5
Central heating with solar energy
Three-way diverter valve R6 rZ is
switched to position "AB-A" if the tem-
perature differential between buffer cyl-
inder temperature sensor S5 qZ and
heating circuit return temperature sensor
S6 rT is greater than start temperature
differential ΔT6on. The heating return
water is fed to boiler 1 via heating water
buffer cylinder qP.
If the temperature of the preheated
return water is too low, boiler 1 reheats
the water to the required flow tempera-
ture. Three-way diverter valve R6 rZ is
switched to position "AB-B" if the actual
temperature falls below stop tempera-
ture differential ΔT6off.
36
(cont.)
Central heating without solar energy
Three-way diverter valve R6 rZ remains
at zero volt (position "AB-B") if the tem-
perature differential between buffer cyl-
inder temperature sensor S5 qZ and
heating circuit return temperature sensor
S6 rT is less than stop temperature dif-
ferential ΔT6off. There will be no flow
through heating water buffer cylinder
qP.
Boiler 1 supplies the heating circuit
with heat according to the heating curve
set at boiler control unit 2.
A low loss header 6 with flow temper-
ature sensor 5 is required in conjunc-
tion with a wall mounted oil/gas
boiler.