Viessmann Vitodens 333-F Service Instructions Manual page 60

Coding
Code 2
(cont.)
Coding in the delivered condition
Heating circuit A1/M2
A6:36 Extended economy
function disabled (only
for weather-compen-
sated control units)
A7:0 Without mixer economy
function (only for weath-
er-compensated control
units)
A8:1 Heating circuit with
mixer M2 creates a de-
mand for the internal
circulation pump (only
for weather-compen-
sated control units)
60
Possible change
A6:5 Extended economy con-
to trol enabled, i.e. the burn-
A6:35 er and heating circuit
pump will be switched
OFF and the mixer
closed at a variable
value, adjustable be-
tween 5 and 35 °C plus
1 °C. Base value is the
adjusted outside tem-
perature. This value is
based on the actual out-
side temperature and a
time constant that takes
the cooling down of an
average building into
consideration.
A7:1 With mixer economy
function (extended heat-
ing circuit pump logic):
Heating circuit pump also
"OFF":
If a mixer has been
closed for longer than
20 min.
Heating pump "ON":
&
If the mixer changes to
control function
&
If there is a risk of frost
A8:0 Heating circuit with mixer
M2 creates no demand
for the internal circulation
pump