Viessmann VITOLIGNO 300-C Operating Instructions Manual page 50

Maintenance
Vitoligno 300-C Operating
Terminology
(continued)
Reduced room temperature
When you are out or during the night, set the reduced
room temperature (see page 18). 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
automatically to prevent excess pressure in the DHW
tank.
Solar circuit pump
In conjunction with solar thermal systems. The solar
circuit pump delivers the cooled heat transfer medium
from the DHW tank indirect coil to the collectors.
Set temperature
Default temperature that should be reached;
e.g. set DHW temperature.
Summer mode
Heating program "Only DHW".
At warmer times of the year, i.e. when rooms do not
have to be heated, you can disable heating mode.
The boiler remains enabled for DHW heating.
Tank primary pump
Circulation pump for heating the DHW in the DHW tank.
Drinking water filter
A device that removes solids from the water. The drinking
water filter is installed in the cold water pipe upstream of
the DHW tank or the instantaneous water heater.
Weather-compensated mode
In weather-compensated mode, the heating supply
temperature is controlled according to the outdoor
temperature. This means that no unnecessary heat is
generated in order to heat the rooms to the set room
temperature you selected.
The outdoor temperature is captured and transmitted to
the control unit by a sensor fitted outside the building.
DHW recirculation pump
The DHW recirculation pump transports the hot water
around a circuit between the DHW tank and the draw-
off points (e.g. hot tap). This makes hot water available
quickly at the draw-off point.
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