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The following 4 options for grid utilisation are taken
into account:
1. Not a lot of power in the grid (grid overload):
The power supply utility can block the heat pump if
not a lot of power is available.
The appliance restarts automatically with the selec-
ted operating program as soon as the power supply
utility enables the power supply again.
During power-OFF, central heating is provided by
the heating water buffer cylinder. If no heating water
buffer cylinder is installed or its temperature is too
low, the rooms are heated using the available auxili-
ary heaters, e.g. oil boiler, electric booster heater.
DHW can only be heated during the power-OFF
period using the auxiliary heaters.
2. No excess power, normal grid utilisation:
The heat pump is operated according to its settings
and the agreed conditions (electricity price).
3. Small amount of excess power:
The power supply utility provides the power at no
cost.
If a time phase is active in the time program, the
heat pump is started. To utilise the cheap power,
you can raise the set temperature for the following
functions or lower it for cooling:
DHW heating
Heating the heating water buffer cylinder
Central heating
Central cooling
Enable electric booster heater
Note
The functions that can be utilised depend on the
heat pump type.
4. Large amount of excess power:
The power supply utility provides the excess power
at no cost.
The power supply utility starts the heat pump imme-
diately, even if no time phase is active in the time
program. System components are heated to the
max. possible temperatures or cooled to the min.
possible temperatures.
Information about operation with cheap and free
electricity
Electric power consumptions of the heat pump and the
electric booster heater are not taken into account when
calculating the seasonal performance factor.
Example: utilisation of excess power for DHW
heating
Cheap excess power
The heat pump is operated with the excess power from
the power supply utility to heat DHW to the increased
set DHW temperature.
In the time program you have set the time phases dur-
ing which DHW heating is enabled. The power supply
utility may start DHW heating, even outside the set
time phases.
To utilise even more cheap excess electricity for DHW
heating, the standard DHW temperature can be
increased. You can set the value for this temperature
increase.
Standard DHW temperature:
50 °C
Increase the DHW temperature when utilising power
generated on site:
10 K (10 Kelvin)
The DHW is heated to 60 °C. If DHW consumption is
the same, the next DHW heating period using power at
the standard tariff is postponed until later.
Free excess power
DHW heating is started immediately, regardless of
your settings in the time program.
The DHW will be heated to the maximum possible
temperature. This temperature has been set by your
contractor.
Standard DHW temperature:
50 °C
Max. temperature of your DHW cylinder (set by your
contractor):
65 °C
The DHW is heated to 65 °C. If DHW consumption is
the same, the next DHW heating period using power at
the standard tariff is postponed until later.
Note
If you enable several functions for Smart Grid, the
functions for DHW heating will have priority over the
functions for central heating.
The modified set temperatures do not affect the elec-
tric booster heater. The electric booster heater is
switched off at the limits that apply without Smart
Grid. In the example, this is the standard DHW tem-
perature of 50 °C.
Utilisation of power generated on site and utilisa-
tion of excess power from the grid (Smart Grid)
If the utilisation of power generated on site and Smart
Grid are enabled and active, the function with the larg-
est temperature increase or reduction is used.
Appendix
Terminology (cont.)
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