H Dual Mode Dhw Heating With Two Dhw Cylinders, With Vitosolic 200 - Viessmann Vitosol
100 Technical Manual

4.3 System design 3
4.3 System design 3
Dual mode DHW heating with two DHW cylinders with Vitosolic 200
(particularly suitable for retrofitting in existing systems)
DHW heating without solar energy
DHW cylinder 2 is heated by the boiler.
The cylinder thermostat with cylinder
temperature sensor 6 of the boiler
control unit switches the cylinder loading
pump 7.
DHW circulation pump ß (if installed) is
8b
switched ON and relayering pump ß is
switched OFF to ensure that DHW
circulation takes place only via DHW
cylinder 2.
DHW with solar energy
Solar circuit pump 4 is switched ON and
DHW cylinder 1 is loaded, if a
temperature differential higher than
start−up temperature differential DT
measured between collector temperature
sensor 2 and cylinder temperature
sensor 3.
Pump 4 is switched OFF when:
H the actual temperature falls below
shutdown temperature differential DT
H the electronic temperature limit (safety
shutdown at 90 ºC) set at the control
unit or that set at the high limit safety
cut−out (if required) is exceeded.
68
8a
Relayering pump ß is started, if the
temperature differential between sensors
9 and qP is greater than the start−up
temperature differential DT6
is
on
loading in conjunction with the auxiliary
function has been enabled (see page 60);
the pump will be switched OFF , if the
actual temperature falls below shutdown
temperature differential DT6
auxiliary function is terminated.
off
The DHW circulation covers both DHW
8a
cylinders. This feeds the water heated in
DHW cylinder 1 into DHW cylinder 2. This
or DHW way, DHW cylinder 2 is also heated by
ON
solar energy.
DHW circulation pump ß (if installed) for
DHW cylinder 2 is controlled by the boiler
control unit.
or if the
OFF
8b
VITOSOL