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Viessmann Vitovalor PT2 Manual

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Gas condensing module
Integral gas condensing system boiler to cover peaks
in demand for heat generation. If the heat generated
by the fuel cell is insufficient, the gas condensing sys-
tem boiler starts up to ensure heating comfort.
Heating mode
Standard heating mode or comfort mode
For periods when you will be at home during the day,
heat your rooms to the standard room temperature or
comfort room temperature. Set the periods (time pha-
ses) using the time program for central heating.
Room temperature-dependent heating mode
In room temperature-dependent mode a room is
heated until the set room temperature has been
reached. For this, a separate temperature sensor must
be installed in the room.
The heating output is regulated independently of the
outside temperature.
Reduced heating mode
For periods when you will be absent or during the
night, heat your rooms to the reduced room tempera-
ture. Set the periods using the time program for central
heating. With underfloor heating systems, reduced
heating mode only yields limited energy savings (see
"Underfloor heating system").
Weather-compensated heating mode
In weather-compensated mode, the flow temperature
is controlled according to the outside temperature.
More heat is made available at a lower outside temper-
ature than at a higher one.
The outside temperature is captured and transmitted to
the control unit by a sensor fitted outside the building.
Heating curve
Heating curves illustrate the relationship between the
outside temperature, the set room temperature and the
flow temperature. The lower the outside temperature,
the higher the flow temperature.
In order to guarantee sufficient heat with minimum
energy consumption at any outside temperature, the
conditions of your building and system must be taken
into consideration. The heating curve is adjusted by
your contractor for this purpose.
3.2
3.4
Flow temperature in °C
Outside temperature in °C
Heating curve slope
3.0
2.8
2.2
2.4
2.0
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
90
80
70
60
50
40
30
20
1.8
2.6
1020 -30-20-100
Fig. 9
Appendix
Terminology (cont.)
6194132
… 62 …


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