Viessmann VITODENS 100-W Operating Instructions Manual page 23

Appendix
Terminology
(cont.)
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.
Drinking 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.
Flow temperature
The temperature of the heating water
that flows to the radiators (in the flow
line). Accordingly, the temperature of the
heating water that flows from the radia-
tors to the boiler (in the return line) is
described as the return temperature.
Weather-compensated operation
In weather-compensated operation, the
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 required
room temperature you selected.
The outside temperature is captured and
transmitted to the control unit by a sen-
sor fitted outside the building.
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