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Viessmann Vitodens 222-F - 2023 Manual

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Night setback
See "Reduced heating mode"
Open flue operation
The combustion air is drawn from the room where the
heat generator is installed.
Room sealed operation
The combustion air is drawn from outside the building.
Room temperature
■Standard room temperature or comfort room temper-
ature:
Set the standard room temperature or comfort room
temperature for periods when you are at home dur-
ing the day.
■Reduced room temperature:
For periods when you will be absent or during the
night, set the reduced room temperature; see "Heat-
ing mode".
Return temperature
The return temperature is the temperature at which the
heating water leaves a system component such as a
heating circuit.
Safety 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
cylinder.
The heating circuits are also equipped with safety
valves.
Solar circuit pump
In conjunction with solar thermal systems. The solar circuit pump delivers the cooled heat transfer
medium from the indirect coil of the DHW cylinder to
the solar collectors.
Set temperature
See "Set temperature".
Summer mode
In warmer months, you can switch off heating opera-
tion.
To do so, select "DHW" operating program "On" and
"Standby mode".
The system remains in operation for DHW heating.
Central heating is switched off.
Appendix
Terminology (cont.)
5593212
… 63 …


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