Viessmann VITODENS 200-W Service Instructions Manual page 50

Codes
Code 2
(cont.)
Coding in the delivered condition
Boiler circuit, mixer circuit
A6:36 Extended economy func-
tion disabled (only for
weather-compensated
control units)
A7:0 Without mixer economy
function (only for
weather-compensated
control units)
A8:1 Heating circuit with mixer
M2 creates a demand for
the internal circulation
pump (only for weather-
compensated control
units)
50
Possible change
A6:5 Extended economy mode
to is enabled, i.e. the burner
A6:35 and heating circuit pump
will be switched OFF and
the mixer will be closed at
a variable value that is
adjustable between 5 and
35 °C plus 1 °C. This value
is based on the adjusted
outside temperature, com-
prising the actual outside
temperature 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
the mixer was closed lon-
ger than 20 min. Heating
pump "ON":
■ If the mixer changes to
control mode
or
■ If there is a risk of frost
A8:0 Heating circuit with mixer
M2 creates no demand for
the internal circulation
pump