Enabling Utilisation Of Power Generated On Site - Viessmann VITOTRONIC 200 Service Instructions Manual

Function description
Photovoltaics
(cont.)
Function
Heating the buffer cylinder
Central heating
Cooling the heating water/cool-
ant buffer cylinder
Central cooling

Enabling utilisation of power generated on site

Optimisation of utilisation of power generated on site is
enabled automatically if all of the following conditions
are met:
"Enable own energy consumption PV 7E00" is set
■
to "1" or "2".
■ The required function is enabled: See the table
above.
Output matching
The compressor output can automatically match the
currently available electric output from the photovoltaic
system, so that the compressor does not have to draw
power from the grid during utilisation of power gener-
ated on site. To this end, set "Prop. of external cur-
rent 7E02" to a value between "0" and "9".
DHW heating
The set temperature for DHW heating in the case of
utilisation of power generated on site is "Set DHW
temperature 6000" plus "Raise set DHW cylinder
temperature PV 7E21".
The heating of the DHW cylinder begins if all of the fol-
lowing conditions are met:
Utilisation of power generated on site is enabled (see
■
"Enabling utilisation of power generated on site").
■ The temperature in the DHW cylinder falls below the
adjusted set temperature by the reduced start hyste-
resis.
Within the next 24 h, at least 1 time phase is set in
■
the "Time program DHW".
The statistical evaluation of the user behaviour can
also serve as additional start criteria: See chapter
"Consideration of user behaviour".
For output-controlled compressors, the set compressor
performance results directly from the available PV
energy. With this default, the compressor may also run
outside the efficient output range.
DHW heating with utilisation of power generated on
site ends when the set constant temperature in the
DHW cylinder has been reached.
70
Release
"Enable own energy consumptn
for heating water buffer cyl. 7E12"
"Enable own energy consumption
for heating 7E13"
"Enable own energy consumptn
for coolant buffer cylinder 7E16"
"Enable own energy consumption
for cooling 7E15"
■ Over a certain period, the electrical output exported
to the grid is greater than the electrical output of the
heat pump.
"Standby mode" and "Holiday program" are disa-
■
bled.
This output adjustment is enabled when the following
conditions are met:
The non-adjusted set temperatures have been
■
reached. The heat pump is running to achieve the
adjusted set values.
■ The electrical output fed into the grid is higher than
the minimum output of the compressor.
Note
If whilst the DHW cylinder is being heated the condi-
tions for utilisation of power generated on site are no
longer met (see "Enabling utilisation of power gener-
ated on site"), heating continues until "Set DHW tem-
perature 6000" is reached. For this, the heat pump
and any booster heaters required are supplied with
power from the grid. The raising of the set tempera-
ture is no longer taken into account.
Consideration of user behaviour
Start times for DHW heating are logged and analysed.
This enables the heat pump control unit to capture pat-
terns of utilisation.
This pattern can be taken into account for DHW heat-
ing with utilisation of power generated on site. DHW
heating can then be switched on if the usage pattern
indicates that a DHW demand is expected to occur in
the next few hours.
A heating contractor certified by Viessmann for heat
pumps can enable this function.
The start time for the next DHW heating is moved for-
wards, if the exported electrical output exceeds
"Threshold for electrical power 7E04".
Set value adjusting
Max. "Raise set heating water buffer
cylinder temp PV 7E22"
"Raise set room temperature PV
7E23"
"Reduce set coolant buffer cylinder
temperature PV 7E26"
"Reduce set room temperature PV
7E25"