Viessmann VITOLIGNO 300-P Service Instructions Manual page 118

Function description
Control functions
Cylinder temperature control
Brief description
■ The cylinder temperature control is a
constant temperature control function.
It works by starting and stopping the
circulation pump for cylinder heating.
The switching differential is ±2.5 K.
■ When the DHW cylinder is heated up,
a set boiler water temperature is speci-
fied that lies 15 K above the set DHW
temperature (adjustable via coding
address "60").
■ During cylinder heating, central heat-
ing is switched off (optional cylinder
priority control).
■ Coding addresses that influence the
cylinder temperature control:
54, 55, 56, 58, 59, 60 to 62, 64, 67, 70
to 75, 7F, 84, 85, A2.
For a description, see codes overview.
Functions
Time program
An automatic program or an individual
time program may be selected for DHW
heating and the control of the DHW cir-
culation 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 phases per day to be set via the
time switch to control DHW heating and
4 time phases for the DHW circulation
pump.
All cylinder heating sequences will be
completed independent of the time pro-
gram.
118
(cont.)
In conjunction with coding address
"7F"
■ Detached house
Code "7F:1":
– Automatic mode
For systems with two heating cir-
cuits, the heating times for heating
circuit 1 are applied.
– Individual time program
The switching times for DHW heat-
ing and the DHW circulation pump
have the same effect on all heating
circuits.
■ Apartment building
Code "7F:0":
– Automatic mode
For systems with two heating cir-
cuits, the heating times for the indi-
vidual heating circuit are applied.
– Individual time program
The switching times for DHW heat-
ing and the DHW circulation pump
can be adjusted individually for each
heating circuit.