Viessmann Vitodens 222-F B2TA Installation And Service Instructions Manual page 83

"Heating circuit ..."/group 5
Coding in the delivered condition
Extended economy function adjusted outside temperature
A6:36 Extended economy con-
trol disabled (only for
weather-compensated
control units)
Extended economy function mixer
A7:0 Only for heating circuit
with mixer:
Without mixer economy
function (only for weath-
er-compensated control
units)
Pump idle time, transition reduced mode
A9:7 With pump idle time:
Heating circuit pump
"OFF" if the set value is
altered through a change
in operating mode or
through a change in the
set room temperature
(only for weather-com-
pensated control units)
(cont.)
Possible change
A6:5 Extended economy control
to enabled, i.e. the burner and
A6:35 heating circuit pump will
stop and the mixer will be
closed at a variable value,
adjustable between 5 and
35 °C plus 1 °C. The base
value is the adjusted out-
side temperature. This val-
ue is based on the actual
outside temperature and a
time constant, which takes
the cooling down of an
average building into con-
sideration
A7:1 With mixer economy func-
tion (extended heating cir-
cuit pump logic):
Heating circuit pump also
"OFF":
■ If the mixer has been
Heating circuit pump
"ON":
■ If the mixer changes to
■ If there is a risk of frost
A9:0 Without pump idle time
A9:1 With pump idle time, ad-
to justable from 1 to 15.
A9:15 1 = short idle period
15 = long idle time
Code 1
closed for longer than
20 min.
control function
83