Preparing for installation
Installation information
Danger
Subject to system configuration,
DHW temperatures above 60 °C
can occur. DHW with tempera-
tures in excess of 60 °C can
cause scalding.
System example 1
DHW heating with dual-mode DHW cylinder
Main components
■ Viessmann solar collectors
■ DHW cylinders Vitocell 100-B or
Vitocell 300-B
■ Vitosolic 100, type SD1
■ Solar-Divicon
■ 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 DT E.
Solar circuit pump R1 eE stops if:
■ The actual temperature falls below the
stop temperature differential DT A
■ The electronic temperature limit of
control unit eZ is exceeded (max.
90 °C)
■ The temperature selected at high limit
safety cut-out qW (if installed) is
reached
6
To limit the temperature to 60 °C,
install mixing equipment, e.g. a
thermostatically controlled mix-
ing valve (accessory). Install a
mixer tap as anti-scalding device
at the draw-off point.
Additional function for DHW heating
The requirements for the additional func-
tion are achieved through circulation
pump R2 qT.
Suppression of DHW cylinder reheat-
ing by the boiler
Coding address "67" in boiler control unit
2 defaults a third set DHW temperature
(setting range 10 to 95 °C). This value
must be below the first set DHW temper-
ature. DHW cylinder qP will only be
heated by boiler 1 (solar circuit
pump R1 eE runs) if this set value cannot
be achieved by the solar thermal sys-
tem.
DHW heating without solar energy
The upper section of DHW cylinder qP is
heated by boiler 1. The cylinder ther-
mostat with cylinder temperature sen-
sor 3 of boiler control unit 2 regulates
cylinder heating 4.