Viessmann VITODENS 200-W WB2B Series Start-Up/Service Instructions page 47

Coding Level 2
(continued)
Overview of coding addresses
Coding (factory default setting)
Boiler circuit, mixing valve circuit
A4:0 With frost protection
A5:5 With heating circuit pump logic function
(economy circuit): Heating circuit pump (economy circuit): Heating circuit pump
"OFF" if the outdoor temperature "OFF" if the outdoor temperature
(AT) is 1 K higher than the room
temperature setpoint (RTset)
AT > RTset + 1 K
Coding (factory default setting)
Boiler circuit, mixing valve circuit
A6:36 Extended economy function disabled
A7:0 Without mixing valve economy function
A8:1 Heating circuit with mixing valve creates
a demand for the circulation pump
(continued)
Parameter
coding address coding address
A5:...
1
2
3
4
5
6
7 to 15
Possible change
A4:1 No frost protection, adjustment
only possible if coding address "A3: -9"
has been selected.
Note:
Observe the 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", if (see the
A5:15 following table)
Possible change
A6:5 Extended economy mode is enabled, i.e. the
to
burner and heating circuit pump are switched
A6:35 OFF and the mixing valve will be closed at
a variable value that is adjustable between 5
and 35°C plus 1°C. This value is based on the
dampened outdoor temperature, comprising
the actual outdoor 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 was closed longer than 20 min. Heating valve was closed longer than 20 min. Heating
pump "ON": pump "ON":
H If the mixing valve changes to control mode
or
H If there is a risk of frost
A8:0 Heating circuit with mixing valve creates no
demand for the circulation pump
With heating circuit pump logic
function: Heating circuit pump function: Heating circuit pump
OFF, if
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
to
AT > RTset - 9 K
Coding
47