Mixer - Viessmann VITOTRONIC 200 Operating Instructions Manual

Terminology
(cont.)

Mixer

A mixer mixes the heated heating water with the
cooled water returning from the heating circuit. The
water, heated to the right temperature in line with
demand, is pumped to the heating circuit by the heat-
ing circuit pump. The heat pump control unit adjusts
the heating circuit flow temperature via the mixer to
suit different conditions, e.g. changing outside temper-
atures.
Room temperature
Standard room temperature:
■
For the periods when you are at home during the
day, set the standard room temperature.
Reduced room temperature:
■
For the periods when you are out or during the night,
set the reduced room temperature. See also "Heat-
ing mode/cooling mode".
Ventilation room temperature:
■
This room temperature influences the bypass activa-
tion. See also "Controlled domestic ventilation".
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 cylinder.
Secondary pump
The secondary pump transports the heating water from
the heat pump to the heating system. In heating sys-
tems with a heating water buffer cylinder the heating
water is first transported to the buffer cylinder.
Solar circuit pump
In conjunction with solar thermal systems.
Cylinder primary pump
Circulation pump for heating the DHW in the DHW cyl-
inder.
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 cylinder or the instantaneous
water heater.
When cooling via a heating circuit, e.g. an underfloor
heating system, the mixer serves to keep the tempera-
ture above the condensation point of the indoor air
(dew point). This prevents the formation of conden-
sate.
The heating circuits and the brine circuit are also
equipped with safety valves.
The solar circuit pump delivers the cooled heat transfer
medium from the indirect coil of the DHW cylinder to
the solar collectors.
Appendix
65