Cylinder Temperature Control; Brief Description; Functions - Viessmann VITOTRONIC 200 Installation And Service Instructions Manual

Function description

Cylinder temperature control

Brief description

Cylinder temperature control is a constant tempera-
■
ture control. It operates by starting and stopping the
circulation pump for cylinder heating.
The switching differential is
■ When the DHW cylinder is heated, the default set
boiler water temperature is 20 K above the set DHW
temperature (adjustable via coding address "60" in
the "DHW" group).

Functions

Time program
An automatic or an individual time program may be
selected for DHW heating and the DHW circulation
pump.
Compared with the heating circuit heat-up phase,
DHW heating starts 30 min earlier in automatic mode.
The individual time program enables up to 4 time pha-
ses per day to be set for DHW heating and the DHW
circulation pump for every day of the week.
All cylinder heating sequences will be completed inde-
pendently of the time program.
In conjunction with coding address "7F" in the
"General" group
■ Detached house
Code "7F:1":
Automatic mode
–
The heating times for heating circuit 1 are applied
to systems with two or three heating circuits.
– Individual time program
The time phases for DHW heating and the DHW
circulation pump have the same effect on all heat-
ing circuits.
Apartment building
■
Code "7F:0":
– Automatic mode
For systems with two or three heating circuits, the
heating times for the relevant heating circuit will be
applied.
Individual time program
–
The time phases for DHW heating and the DHW
circulation pump can be adjusted individually for
each heating circuit.
82
2.5 K.
±
Priority control
■ With priority control: (code "A2:2" in the "Heating
circuit..." group):
The set flow temperature is set to 0
der heating.
The mixer closes and the heating circuit pump is
switched off.
■ Without priority control:
The heating circuit control unit continues to operate
with the same set value.
With modulating priority control in conjunction with
■
heating circuits with mixer:
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 tempera-
ture has not been reached during cylinder heating.
The set flow temperature is determined from the fol-
lowing parameters:
Outside temperature
–
– Differential between the set and the actual boiler
water temperature
– Heating curve slope and level
– Setting of coding address "A2" in the "Heating cir-
cuit..." group
Frost protection
The DHW cylinder will be heated to 20
temperature sinks below 5
Auxiliary function for DHW heating
Select a second set DHW temperature in coding
address "58" in the "DHW" group. This function is ena-
bled by setting the fourth DHW time phase for DHW
heating.
Operating instructions
Set DHW temperature
The set DHW temperature can be adjusted between
10 and 60 °C.
C during cylin-
°
C if the DHW
°
C.
º