Viessmann VITODENS 100-W B1HE Operating Instructions Manual page 37

Appendix
Vitodens 100-W B1HE/B1KE Operating
Terminology
(continued)
Heating circuit pump
Circulation pump for circulating the heating water in
the heating circuit
Room air dependant operation
The combustion air is drawn from the room where the
boiler is installed.
Direct vent operation
Combustion air is drawn from outside the building.
Return temperature
The return temperature is the temperature at which the
heating water leaves a system component such as a
heating circuit.
Safety relief valve
Safety equipment that must be installed in the cold
water pipe by your contractor. The safety valve opens
automatically to prevent excess pressure in the DHW tank.
The heating circuits are also equipped with safety valves.
Temperature target
See "Target temperature".
Target temperature
Specified temperature that should be reached,
e.g. target DHW temperature.
Drinking water filter
A device that removes solids from potable water.
The drinking water filter is installed in the cold water pipe
upstream of the DHW tank or the instantaneous water
heater.
Supply temperature
The supply temperature is the temperature at which the
heating water enters a system component such as a
heating circuit.
Weather-compensated operation
See "Heating operation"
Time program
In the time programs you determine what your heating
system should do at what time.
Operating status
The operating status indicates how a component of
your heating system is being operated.
For example, the operating statuses for DHW heating
have different temperature levels.
The times for the operating status changeover are defined
when the time program is set.
37