Viessmann Vitotronic 200 KW2 Installation And Service Instructions Manual page 49

Heating circuit control
Domestic hot water temperature
H With priority control:
The set flow temperature will be
set to 0 ºC whilst the cylinder is
being heated up.
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 coding address A2.
Room temperature
In conjunction with remote control
and room temperature hook−up
(observe coding address b0)
Compared with the outside
temperature, the room temperature
has a greater influence on the set
boiler water temperature. This
influence may be changed via coding
address b2.
In conjunction with the mixer circuit:
For a control difference (deviation
from the actual value) above 2 K room
temperature, the influence can be
further increased (via coding address
b6, quick heat−up/quick setback).
(cont.)
Quick heat−up:
Only possible for weather−
compensated mode with room
temperature hook−up.
The set room temperature must be
raised by a minimum of 2 K by:
H Pressing party key M
H Changing from reduced to
standard mode
H Start−up optimisation
Quick heat−up will stop when the set
room temperature has been reached.
Quick setback:
Only possible for weather−
compensated mode with room
temperature hook−up.
The set room temperature must be
reduced by a minimum of 2 K by:
H Pressing economy key N
H Changing from heating mode to
reduced mode
H Shutdown optimisation
Quick setback will stop when the set
room temperature has been reached.
Heating circuit pump logic
(economy circuit)
The heating circuit pump is switched
OFF (set flow temperature set to
0 ºC), when the outside temperature
exceeds the value selected via
coding address A5.
Function description
49