Viessmann Vitotronic 200 KW2 Installation And Service Instructions Manual page 94

Coding
Code 2
(cont.)
Coding in the delivered condition
Mixer circuit
A7 : 0 Without mixer economy
function
Boiler circuit/mixer circuit
A9 : 0 Without pump idle period
b0 : 0 With remote control unit:
*1
Heating mode/red. mode:
weather−compensated
*1
Change the code for the heating circuit without mixer A1 for boilers without lower
temperature limit or for mixer circuit M2, if the remote control unit affects that
heating circuit.
94
Possible change
A7 : 1 With mixer economy function
(extended heating circuit
pump logic):
Heating circuit pump also OFF ,
if the mixer was closed longer
than 12 minutes.
Heating circuit pump ON,
H if the mixer changes to
control mode
or
H after cylinder heating
(for 20 min)
or
H if there is a risk of frost
A9 : 1 With pump idle period:
to Heating circuit pump OFF in
A9 : 15 case of set value modification
(by changing the operating
mode or the set room
temperature)
b0 : 1 Heating mode:
weather−compensated
Red. mode:
with room temperature
hook−up
b0 : 2 Heating mode:
with room temperature
hook−up
Red. mode:
weather−compensated
b0 : 3 Heating mode/red. mode:
with room temperature
hook−up