Viessmann VITOTRONIC 300 Operating Instructions Manual page 39

Vitotronic 300, GW5B Operating
Terminology
(continued)
Standard room temperature
Set the standard room temperature when you are at home
during the day (see "Setting the room temperature" on
page 13).
Open flue operation
The combustion air is drawn from the room where the
boiler is installed.
Balanced flue operation
The combustion air is drawn from outside 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 heating.
During these periods, 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 "Setting the room temperature"
on page 13 ).
See also "Reduced heating mode" on page 13).
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 operational for DHW heating.
DHW 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 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 sensor fitted outside the building.
DHW circulation pump
The DHW circulation 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.
Appendix
39