Viessmann VITOTRONIC 200 Installation And Service Instructions Manual page 60

Code 2
"Heating Circuit 1, Heating Circuit 2, Heating Circuit 3" Group
Coding in the factory set condition
A4:0 With frost protection
A5:5 With heating circuit pump logic function
(economy circuit):
Heating circuit pump "OFF" when the outside
temperature (AT) is 1 K higher than the set
room temperature (RT
AT > RT
set
Parameter address A5:...
1
2
3
4
5
6
7
to
15
Coding in the factory set condition
A6:36 Extended economy mode disabled
A7:0 Without mixing valve economy function
(only for heating circuits with mixing
valve)
A9:7 With pump idle time:
Heating circuit pump "OFF" in case
of set value modification by changing the
operating mode or changing the set room
temperature
AA:2 With output reduction through
temperature sensor aJA.
60
)
set
+ 1 K
Vitotronic 200 and 300-K Installation and Service
Possible change
A4:1 No frost protection; this setting is only
possible if code "A3:-9" has been selected.
Note: See "Please note" for code "A3"
A5:0 Without heating circuit pump logic function
A5:1 With heating circuit pump logic function:
to Heating circuit pump "OFF";
A5:15 see the following table
With heating circuit pump logic function:
Heating circuit pump "OFF"
AT > RT + 5 K
set
AT > RT + 4 K
set
AT > RT + 3 K
set
AT > RT + 2 K
set
AT > RT + 1 K
set
AT > RT
set
RT > RT - 1 K
actual set
RT > RT - 9 K
actual set
Possible change
A6:5 Extended economy control enabled, i.e. the burner
and heating circuit pump will be stopped and the
to
mixing valve closed at a variable value, adjustable
A6:35
between 41 and 95° F (5 and 35° C) plus 2°F
(1°C). The base value is the adjusted outside
temperature. This value is based on the actual
outside temperature and a time constant that
takes the cooling down of an average building into
consideration.
A7:1 With mixing valve economy function (extended
heating circuit pump logic):
Heating circuit pump also "OFF":
- If the mixing valve has been attempting to close
for longer than 20 min.
Heating circuit pump
"ON":
- If the mixing valve changes to control function
- If there is a risk of frost
A9:0 Without pump idle time
A9:1 With pump idle time;
to adjustable from 1 to 15
A9:15
AA:0 Without output reduction.
AA:1 No function.
(continued)