Photovoltaics - Viessmann VITOTRONIC 200 Service Instructions Manual

Photovoltaics

Power generated by the photovoltaic system can be
used to operate the compressor and other heating sys-
tem components (utilisation of power generated on
site).
For this, the amounts of electrical energy available for
the utilisation of power generated on site have to be
transferred to the heat pump control unit. The following
options are available for establishing data communica-
tion with the photovoltaic system:
■ An energy meter (accessories) is connected to the
heat pump control unit via Modbus.
The photovoltaic system is connected to the heat
■
pump control unit via a Smart Home system, e.g.
Vitocomfort 200 (accessories).
In order to utilise power generated on site, the follow-
ing heating system functions can be enabled:
DHW heating
■
Heating the buffer cylinder
■
Central heating
■
■ Cooling the heating water/coolant buffer cylinder
■ Central cooling
With utilisation of power generated on site, the compo-
nents connected to the heat pump control unit, such as
a secondary pump, are also supplied with power from
the PV system alongside the compressor.
To optimise utilisation of power generated on site, the
control characteristics of the heat pump control unit are
adjusted:
The start time of enabled functions can be brought
■
forward based on a demand forecast.
Timing is selected so that sufficient electricity from
the PV system is available. It may also be that heat-
ing of system components begins outside the set
time phases of the time program.
The set temperatures are adjusted. In addition, the
■
start hystereses are reduced by 50 %.
This enables more electrical energy from the PV to
be stored in the form of thermal energy.
Note
– All safety-related temperature limits, e.g. "Max.
DHW temperature 6006" also apply for utilisation
of power generated on site.
– Set temperatures can also be adjusted via Smart
Grid. If utilisation of power generated on site and
Smart Grid are active at the same time, the higher
set value adjustment applies: See chapter "Smart
Grid".
Parameters for enable and set value adjusting
Function
DHW heating
In heat pumps with output control, the compressor
■
output is automatically matched to the amount of
power generated by the photovoltaic system. This
prevents power for operating the heat pump having
to be drawn from the grid.
Note
Automatic adjustment of the compressor output is
not possible with heat pump cascades.
Example:
Set value increase for DHW heating in the case of uti-
lisation of power generated on site
K
Fig. 12
A
B
C
D
E
F
G
H
K
Release
"Enable own energy consumptn
for set DHW temperature 2 7E10"
"Enable own energy consumption
for DHW heating 7E11"
ϑ
A C
B
H
G
Temperature curve, DHW cylinder without utilisa-
tion of power generated on site
Temperature curve, DHW cylinder with utilisation
of power generated on site
"Set DHW temperature 6000"
Adjusted set temperature, DHW cylinder
Reduced start hysteresis
"Hysteresis DHW temperature heat pump 6007"
DHW heating without utilisation of power gener-
ated on site
DHW heating with utilisation of power generated
on site
"Raise set DHW cylinder temperature PV 7E21"
Set value adjusting
―
"Raise set DHW cylinder tempera-
ture PV 7E21"
Function description
D
E
F
t
69