Viessmann Vitotronic 300 Installation And Service Instructions Manual page 75

Vitotronic 300, GW5B Installation and Service
"Heating circuit 1", "Heating circuit 2", "Heating circuit 3" Group
Coding in the delivered condition
A4:0 With frost protection.
A5:5 With heating circuit pump logic function
(economy mode): heating circuit pump "OFF"
when the outside temperature (AT) is 1 K
higher than the set room temperature (RTset)
AT > RTset + 1 K.
Parameter address
A5:...
1
2
3
4
5
6
7
to
15
Coding in the delivered condition
A6:36 Extended economy mode 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 51).
Note: The max. idle period is 10 h.
AA:2 With output reduction by temperature
sensor aJA.
With heating circuit pump logic function: Heating circuit pump "OFF"
AT > RTset + 5 K
AT > RTset + 4 K
AT > RTset + 3 K
AT > RTset + 2 K
AT > RTset + 1 K
AT > RTset
AT > RTset – 1 K
AT > RTset – 9 K
Possible change
A4:1 No frost protection; this setting is only possible
if code "A3:– 9" has been selected.
Note: Information regarding coding address
"A3" should be observed.
A5:1 With heating circuit pump logic function:
to Heating circuit pump "OFF";
A5:15 see the following table.
Possible change
A6:5 Extended economy control enabled,
to i.e. the burner and heating circuit pump will
A6:35 stop and the mixing valve will be closed at a
variable value, adjustable between 41 to 95°F (5
and 35°C) plus 34°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 longer
than 12 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, adjustable from 1 to 15.
to 1 = short idle period
A9:15 15 = long idle time
AA:0 Without output reduction.
AA:1 No function.
Code 2
(continued)
75