System Example 9 - Viessmann VITOSOLIC 200 Installation And Service Instructions Manual

System example 8
Main menu
Sys.contractor
■ Sen.Th2
■ Sen1 ΔT5Fct
■ Sen2 ΔT5Fct
For pump speed, see page 139.

System example 9

Large solar thermal systems for DHW heating with two mono-
mode DHW cylinders and central heating backup with heating
water buffer cylinder
Main components
■ Viessmann solar collectors
■ DHW cylinder Vitocell 100-V
■ Heating water buffer cylinder
Vitocell 140-E
■ Vitosolic 200
■ Solar-Divicon
■ Solar pump line
■ Wall mounted oil/gas boiler or oil/gas
boiler
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 exceeds the
starting temperature differential ΔT.
Solar circuit pump R1 eE is stopped in
accordance with the following criteria:
(cont.)
■ Actual temperature dropping below
■ Exceeding the electronic temperature
■ Reaching the temperature selected at
Transfer pump R5/R7 qT is started in
accordance with the following criteria:
■ The temperature differential between
■ Additional function for DHW heating is
The water heated in DHW cylinder 1 qP
is transferred to DHW cylinder 2 qI. This
way, DHW cylinder 2 qI is also heated
by solar energy.
Transfer pump R5/R7 qT stops when the
actual temperature falls below stop tem-
perature differential ΔT7off or if the addi-
tional function ends.
DHW circulation pump qE (if installed)
for DHW cylinder 2 qI is controlled by
boiler control unit 2.
System examples
Delivered
condition
4
3
4
the stop temperature differential ΔToff
limit of control unit eZ (max. 90 °C)
high limit safety cut-out qW (if installed)
sensor S7 qZ and sensor S8 qU is
greater than start temperature differ-
ential ΔT7on
enabled
Setting
6
5
6
59