System Example 8 - Viessmann VITOSOLIC 200 Installation And Service Instructions Manual

System examples

System example 8

Large solar thermal systems for DHW heating
Main components
■ Viessmann solar collectors
■ DHW cylinder Vitocell 100-V or
Vitocell 300-V
■ Vitocell 100-L preheating cylinder
■ Heating water buffer cylinder
Vitocell 140-E or Vitocell 160-E
■ Vitosolic 200
■ Solar-Divicon
■ Wall mounted oil/gas boiler or oil/gas
boiler
Function description
DHW heating with solar energy
Charge circuit
Solar circuit pump R1 eE starts and
heating water buffer cylinder rP is
heated up if the temperature differential
between collector temperature sen-
sor S1 eQ and cylinder temperature sen-
sor S2 rQ is greater than start tempera-
ture differential ΔTon.
Solar circuit pump R1 eE is stopped in
accordance with the following criteria:
■ Actual temperature dropping below
the stop temperature differential ΔToff
■ Exceeding the electronic temperature
limit of control unit eZ (max. 90 °C)
■ Reaching the temperature selected at
high limit safety cut-out rE (if installed)
Primary pump (preheating cylinder) R6
qR and discharge pump (heating water
buffer cylinder) R3 qI start in accord-
ance with the following criteria:
54
■ The temperature differential between
buffer cylinder temperature sensor S5
rW and pre-heating cylinder tempera-
ture sensor S6 qW is greater than start
temperature differential ΔT6on
and
■ The temperature in preheating cylin-
der qQ is below the value set at ther-
mostatically controlled mixing
valve qO
Discharge circuit
Preheating cylinder qQ is force-filled with
cold water. The water in preheating cyl-
inder qQ is heated via heat
exchanger qU.
Additional function for DHW heating
The requirements for the additional func-
tion are achieved through circulation
pump R5 qT. Cylinders qP and qQ are
heated.
DHW heating without solar energy
DHW cylinder qP is heated by boiler
1. The cylinder thermostat with cylinder
temperature sensor 3 of boiler control
unit 2 regulates circulation pump for
cylinder heating 4. DHW circulation
pump qE (if installed) is controlled by
boiler control unit 2. Primary pump
(preheating cylinder) R6 qR and dis-
charge pump (heating water buffer cyl-
inder) R6 qI are stopped. The DHW is
routed to DHW cylinder qP via preheat-
ing cylinder qQ.