Viessmann Vitotronic 200 Operating Instructions Manual page 95

Terminology
(cont.)
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.
Safety valve
A safety device that must be installed by your heating
contractor in the cold water pipe. The safety valve
opens automatically to prevent excess pressure in the
DHW cylinder.
Secondary pump
The secondary pump transports the heating water from
the heat pump into the heating system and, in heating
systems with a heating water buffer cylinder, initially
into the buffer cylinder.
Solar circuit pump
In conjunction with solar thermal systems.
Cylinder primary pump
Circulation pump for heating the DHW in the DHW cyl-
inder.
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.
The heating circuits and the brine circuit are also
equipped with safety valves.
The solar circuit pump delivers the cooled heat transfer
medium from the indirect coil of the DHW cylinder to
the solar collectors.
Appendix
95