Viessmann VITOTRONIC 200 Installation And Service Instructions Manual page 96

Coding 2 Vitotronic 300-K
"Heating Circuit 1, Heating Circuit 2, Heating Circuit 3" Group
Coding in the factory set condition
"Frost protection"
a4:0 With frost protection
"Heating circuit pump logic function (economy control)"
a5:5 With heating circuit pump logic function
(economy circuit):
Heating circuit pump OFF when the outdoor
temperature (OT) is 1 K higher than the set
room temperature (RT
Coding address a5:...
1
2
3
4
5
6
7
to
15
Coding in the factory set condition
"Extended economy mode"
a6:36 Extended economy mode disabled
"Mixing valve economy function"
a7:0 Only for heating circuits with mixing
valve:
Without mixing valve economy function
"Pump idle time"
a9:0 Without pump idle time
96
) OT > RT + 1 K
set set
Possible change
a6:5
to
a6:35
a7:1
a9:1
to
a9:15
Vitotronic 200, HO1B and 300-K, MW2C Installation/Service
Possible change
a4:1 No frost protection; this setting is only
possible if coding "a3:–9" has been set.
Note: Information regarding
Observe coding "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"
OT > RT + 5 K
set
OT > RT + 4 K
set
OT > RT + 3 K
set
OT > RT + 2 K
set
OT > RT + 1 K
set
OT > RT
set
OT > RT - 1 K
actual set
OT > RT - 9 K
actual set
Extended economy control enabled, i.e. the burner
and heating circuit pump will stop and the mixing
valve will be closed at a variable value, adjustable
between 41 and 95°F (5 and 35°C) plus 2°F
(1°C). The base value is the adjusted outdoor
temperature. This value is based on the actual
outdoor temperature and a time constant which
takes the cooling down of an average building into
consideration.
With mixing valve economy function:
Heating circuit pump also switched off, if:
- Mixing valve tries closing for more than 20 min
Heating circuit pump switched on, if:
- Mixing valve in control mode
- Frost danger
Pump idle time adjustable from 1 to 15.
1: Short idle time
15: Long idle time
Note: The maximum idle time is 10 h.
See page 60.
(continued)