Primary Source, Ice Store/Solar - Viessmann VITOTRONIC 200 Service Instructions Manual

Function description
Primary source ice store/Solar air absorber
As an alternative to geothermal probes/collectors, an
ice store and a solar air absorber can be used as the
primary source for the heat pump. For this, "Select
primary source 7030" must be set to "1".
The medium in the ice store is heated by the surround-
ing ground and by the solar air absorber. The heat
pump draws this primary energy from the ice store. If
in the course of this the medium falls below freezing
point, the heat pump also utilises the crystallisation
energy. The ice store freezes from the inside out and
thaws again from the outside in.
As an alternative to the ice store, the solar air absorber
can also be used as immediate primary source. A 3-
way diverter valve changes over between the two pri-
mary sources.
Activation conditions for primary source
Primary Central
source heating
Ice store ON
Solar air ab- ON
sorber
Electrical devices also required in addition to the heat
pump with Vitotronic 200, type WO1C:
Vitosolic 200:
Temperature differential control for heating the ice
■
store via the solar air absorber
■ Setting the set differential temperature
■ Enable: "Type solar control unit 7A00" set to "2"
AM1 extension:
Changeover between solar air absorber and ice
■
store as primary source via a 3-way diverter valve
■ Enable: "External extension 7010" set to "2" or "3"
Summer mode
Particularly in summer, high temperatures in the ice
store lead to heat losses to the ground. Use of the
solar air absorber requires frequent reheating. This
results in higher energy costs for the absorber circuit
pump. To avoid this, the maximum temperature of the
ice store is reduced in summer mode to "Average
ground temperature in summer mode 7034".
26
Central Temperature differential solar
cooling air absorber
ON < 0
OFF > "Start hysteresis solar air
absorber 7031"
In cooling mode (natural cooling), the thermal energy
drawn from the rooms is fed to the ice store.
The ice store is heated via the solar air absorber if all
of the following conditions are being met (parameters
set on Vitosolic):
Temperature differential solar air absorber
■
> " Ton".
Δ
■ Absorber temperature > "Th6on".
■ Temperature in the ice store < "Tcylset".
Absorber temperature
Ice store
–
–
Absorber temperature > "Mini-
■
mum temp. for solar absorb-
er primary source 7033"
and
Primary inlet temperature is
■
within the valid range.
Ice store extension:
■ Switching the 3-way diverter valve and absorber cir-
cuit pump
Electrical connection of required equipment and
parameter settings:
www.viessmann-schemes.com
Summer mode is switched on under the following con-
ditions:
On a single day, the heat pump was operating to pro-
■
vide central heating for less than the "Min. runtime
to suppress summer mode 7035" in operation.
■ "Calendar week, start summer mode, ice store
7039" is reached.
■ The "Last calendar week for summer mode 7036"
has not yet been reached.
Ice store
–