Viessmann Vitoligno 300-C Installation And Service Instructions For Contractors page 112

Function description
Control functions
(cont.)
Room temperature
In conjunction with the remote control and room tem-
perature hook-up (coding address "B0"):
Compared to the outside temperature, the room tem-
perature has a greater influence on the set flow tem-
perature (change via coding address "B2").
DHW temperature
The priority control of the cylinder heating can be
adjusted individually for each heating circuit. Adjust-
ment via code A2, heating group, for each heating cir-
cuit. This is used to determine which heating circuit is
affected by priority control during cylinder heating.
■ With priority control:
During cylinder heating, the set flow temperature of
the relevant heating circuits is set to 0 °C.
The mixer closes. The heating circuit pump is
switched off.
Without priority control:
■
The heating circuit pump continues to operate with
the same set value.
■ With reduced priority control:
During cylinder heating, the set flow temperature of
the relevant heating circuits is set to the set value of
reduced heating mode.
Flow temperature control
90
80
70
60
50
40
30
10
Fig. 62
Example for outside temperature
A Underfloor heating system, slope 0.2 to 0.8
Low temperature heating system, slope 0.8 to 1.6
B
Heating system with a boiler water temperature in
C
excess of 75 °C, slope 1.6 to 2.0
Upper control range limit
Electronic maximum temperature limit
Setting range: 1 to 127 °C,
112
Heating circuit pump logic (economy mode)
The heating circuit pump is switched off (set flow tem-
perature set to 0 °C) when the outside temperature
exceeds the value selected via coding address "A5".
Extended economy mode
The heating circuit pump is switched off and the set
flow temperature is set to 0 °C, if one of the following
criteria is met:
■
■
■
■
Frost protection
If the outside temperature falls below +1 °C, a flow
temperature of min. 10 °C is ensured. For changes see
coding address "A3", variable frost protection limit.
Slope
0 -10 -20
-14
Outside temperature in °C
14 °C: Change via coding address "C6".
−
Note
The maximum temperature limiter is no substitute for
the underfloor heating system temperature limiter.
Temperature limiter for underfloor heating:
The outside temperature exceeds the value selected
via coding address "A6".
The set room temperature is reduced via coding
address "A9".
The mixer has been closed for 12 min. (mixer econ-
omy function, coding address "A7").
The actual room temperature exceeds the value
selected via coding address "B5".
1.4
C
1.2
1.0
B
0.8
0.6
0.4
A
0.2
-30