Viessmann Vitocrossal 100 Operating Instructions Manual page 23

Terminology
Constant temperature mode
In constant temperature mode, the heating water is
constantly heated to the selected boiler water tempera-
ture.
Operating program
The operating program determines whether you heat
the rooms and DHW, only heat the DHW, or whether
you shut down your heating system and enable frost
protection monitoring.
You can select the following operating programs:
" "
■
The rooms and DHW are heated (winter mode).
■ " "
DHW is provided but there is no central heating
(summer mode).
" "
■
Frost protection for the boiler and DHW cylinder is
active, no central heating, no DHW heating (standby
mode).
Note
There is no operating program for central heating with-
out DHW heating. If the rooms are also to be heated,
hot water is generally also required (winter mode).
If you still only want central heating, select the "
operating program and set the DHW temperature to 10
C (see page 13). This means that you will not heat
°
DHW unnecessarily but the DHW cylinder is protected
against frost.
Heating circuit
A heating circuit is a sealed unvented circuit that con-
nects the boiler and radiators, in which the heating
water circulates.
Actual temperature
Current temperature at the time of the call up, e.g.
actual DHW temperature
Boiler circuit pump
Circulation pump for the circulation of heating water in
the heating circuit.
Boiler water temperature
See "Constant temperature mode".
Open flue operation
The combustion air is drawn from the room where the
boiler is installed.
Room sealed operation
The combustion air is drawn from outside the building.
Safety valve
Safety equipment that must be installed in the cold
water pipe by your heating contractor. The safety valve
opens automatically to prevent excess pressure in the
DHW cylinder.
Set temperature
Specific temperature that should be reached, e.g. set
DHW temperature for example.
Summer mode
Operating program " ".
If the rooms do not have to be heated in summer, you
can deactivate heating mode. The boiler remains
operational for DHW heating.
Cylinder loading pump
Circulation pump for heating the DHW in the DHW cyl-
inder.
" 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 cylinder or the instantaneous
water heater.
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