Viessmann Vitotronic 200 KW2 Installation And Service Instructions Manual page 54

Function description
Cylinder temperature control
Priority control
H With priority control:
(code A2:2):
During cylinder heating, the set
flow temperature will be set to
0 ºC.
The mixer closes, and the heating
circuit pump is switched OFF .
H Without priority control:
The heating circuit control unit
continues to operate with the same
set value.
H With modulating priority control
(only in conjunction with a mixer
circuit):
The heating circuit pump remains
switched ON. The set flow
temperature of the heating circuits
will be reduced, for as long as the
set boiler water temperature has
not been reached during DHW
cylinder heating. The set flow
temperature is subject to the
difference between the set and the
actual boiler water temperature,
the outside temperature, the
heating curve slope and the setting
of coding address A2.
Frost protection
The DHW cylinder will be heated to
20 ºC if the DHW temperature falls
below 10 ºC.
Auxiliary function
This function is activated by
providing a second set DHW
temperature via coding address 58,
and activating the fourth DHW phase
for DHW heating.
54
DHW heating
(cont.)
Set DHW temperature
The set DHW temperature can be
adjusted between 10 and 60 ºC. The
set range can be expanded to 95 ºC
via coding address 56.
The set default value of the
programming unit and/or the
Vitotrol 300 remote control can be
allocated via coding address 66.
DHW circulation pump
This delivers hot water to the
draw−off points at adjustable times.
Up to four control periods can be set
at the time switch.
Auxiliary circuits
The DHW heating can be blocked or
enabled by changing over the
heating program. An external
contact in conjunction with control
module V can be used to briefly
select the DHW circulation pump.
The time may be adjusted via coding
address 74.
Systems with Vitosolic
A third set DHW temperature can be
defaulted via coding address 67.
Reloading suppression will be active
above the selected temperature. The
DHW cylinder is heated only by the
solar heating system.