Viessmann Vitotronic 100 GC1 Installation And Service Instructions Manual page 114

Function description – Vitotronic 300-K, MW1S
Heating circuit control
Domestic hot water temperature
With priority control:
The set supply temperature will be
set to 0 ˚C / 32 ˚F during DHW
heating.
The mixing valve closes, and the
heating circuit pumps are switched
OFF.
Without priority control:
The heating circuit control unit
continues to operate with the same
set value.
With modulating DHW priority (only
in conjunction with a mixing valve
circuit):
The heating circuit pump remains
switched ON. The set supply
temperature of the heating circuits
will be reduced, for as long as the
set boiler water temperature has not
been reached during DHW tank
heating. The set supply temperature
is subject to the difference between
the set and the actual boiler water
temperature, the outdoor
temperature, the heating curve slope
and coding address A2.
114
(cont.)
Room temperature
in conjunction with remote control
and room temperature input (observe
coding address b0).
Compared to the outdoor temperature,
the room temperature has a greater
influence on the common set supply
temperature. This influence may be
adjusted via coding address b2.
In conjunction with the mixing valve
circuit:
For control differences (actual value
deviation) above 2 ˚C / 3.6 ˚F room
temperature, the influence can be
increased again (via coding address b6,
quick heat-up/quick setback).
Quick heat-up:
The set room temperature must be
raised by a minimum of 2 ˚C / 3.6 ˚F
by:
Pressing party button
Changing from heating with reduced
temperature to heating with normal
temperature
Start-up optimisation
Quick heat-up will stop when the set
room temperature has been reached.
Quick setback:
The set room temperature must be
reduced by a minimum of 2 ˚C / 3.6 ˚F
by:
Pressing economy button
Changing from room heating with
normal temperature to heating with
reduced temperature
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 supply temperature set to 0 ˚C/
32 ˚F), when the outdoor temperature
exceeds the value selected via coding
address A5.