Viessmann VITOTRONIC300 Installation And Service Instructions Manual page 116

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
Parameter address A5:...
1
2
3
4
5
6
7
to
15
Coding in the factory set condition
A6:36 Extended economy control disabled.
A7:0 Only for heating circuits with mixing valve:
Without mixing valve economy function.
A9:7 With pump idle time
(heating circuit pump "OFF")
(See function description on page 82).
AA:2 With output reduction by temperature sensor
aJA.
116
)
set
+ 1 K.
set
With heating circuit pump logic function: Heating circuit pump "OFF"
AT > RT
AT > RT
AT > RT
AT > RT
AT > RT
AT > RT
AT > RT
AT > RT
Possible change
A4:1
A5:0
A5:1
to
A5:15
+ 5 K
set
+ 4 K
set
+ 3 K
set
+ 2 K
set
+ 1 K
set
set
- 1 K
set
- 9 K
set
Possible change
A6:5 Extended economy control enabled,
to i.e. the burner and heating circuit pump will
A6:35 be stopped and the mixing valve closed
at a variable value, adjustable between
41 and 95°F (5 and 35°C) plus 1.8°F (1°C).
The base value is the adjusted outside
temperature.
This value is based on the actual outside
temperature and a time constant, which
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 closed for
Heating circuit pump "ON":
- If the mixing valve changes to control
- If there is a risk of frost.
A9:0 Without pump idle time.
A9:1 With pump idle time; adjustable from 1 to 15.
to 1: short idle period
A9:15 15: long idle period
AA:0 Without output reduction.
AA:1 No function.
Vitotronic 300, GW2B Installation and Service
No frost protection; this setting is only
possible if code "A3:-9" has been selected.
Note: Observe information regarding coding
address "A3".
Without heating circuit pump logic function.
With heating circuit pump logic function:
Heating circuit pump "OFF";
see the following table.
longer than 12 min.
function.
(continued)