Viessmann VITOTRONIC 100 Operating Instructions Manual page 56

Appendix
Terminology
Balanced flue operation
The combustion air is drawn from out-
side the building.
Reduced heating mode
When you are out or during the night, you
can heat the rooms in reduced heating
mode (setback mode). Set the periods
using the time program for central heat-
ing. During these times, the rooms are
heated to a reduced room temperature.
Reduced room temperature
When you are out or during the night, set
the reduced room temperature (see
chapter "Setting the room temperature").
See also "Reduced heating mode".
Safety valve
A safety device that must be installed by
your heating contractor in the cold water
pipe. The safety valve opens automati-
cally to prevent excess pressure in the
DHW cylinder.
Solar circuit pump
In conjunction with solar thermal sys-
tems.
The solar circuit pump delivers the
cooled heat transfer medium from the
DHW cylinder indirect coil to the collec-
tors.
Set temperature
Default temperature that should be
reached; e.g. set DHW temperature.
56
(cont.)
Summer mode
Heating program "Only DHW".
At warmer times of the year, i.e. when
the rooms do not have to be heated, you
can disable heating mode. The boiler
remains enabled for DHW heating.
Cylinder primary pump
Circulation pump for heating the DHW in
the DHW cylinder.
Potable water filter
A device that removes solids from the
water. The drinking water filter is instal-
led in the cold water pipe upstream of the
DHW cylinder or the instantaneous
water heater.
Weather-compensated mode
In weather-compensated mode, the
heating flow temperature is controlled
according to the outside temperature.
This means that no unnecessary heat is
generated in order to heat the rooms to
the set room temperature you selected.
The outside temperature is captured and
transmitted to the control unit by a sen-
sor fitted outside the building.
DHW circulation pump
The DHW circulation pump transfers the
hot water around a circuit between the
DHW cylinder and the draw-off points
(e.g. hot tap). This makes hot water
available quickly at the draw-off point.