Viessmann FB2B Installation And Service Instructions Manual page 93

Heating circuit 1, heating circuit 2, heating...
Coding in the delivered condition
A6:36 Extended economy mode
disabled
A7:0 Without mixer economy
function (only for heating
circuits with mixer)
A8:1 Heating circuit with mixer
creates a demand for the
internal circulation pump
A9:7 With pump idle time:
Heating circuit pump
"OFF" in case of set value
modification by changing
the operating mode or
changing the set room
temperature
(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 close at
a variable value, adjustable
between 5 and 35 °C plus
1 °C. The base value is the
adjusted outside tempera-
ture. This value is based on
the actual outside temper-
ature and a time constant
that takes the cooling down
of an average building into
consideration.
A7:1 With mixer economy func-
tion (extended heating cir-
cuit pump logic):
Heating circuit pump also
"OFF":
■ If a mixer has been
attempting to close for
longer than 20 min.
Heating circuit pump
"ON":
■ If the mixer changes to
control function
■ If there is a risk of frost
A8:0 Heating circuit with mixer
creates no demand for the
internal circulation pump
A9:0 Without pump idle time
A9:1 With pump idle time;
to adjustable from 1 to 15
A9:15
Code 2
93