Viessmann VITODENS 343-F WS4A Installation And Service Instructions Manual page 77

Code 2
(cont.)
Coding in the delivered condition
9C:20 Monitoring LON sub-
scribers
When there is no re-
sponse from a subscri-
ber, values defaulted by
the control unit continue
to be used for a further
20 min. Only then will a
fault message be is-
sued.
9F:8 Differential temperature
8 K; only in conjunction
with a heating circuit
with mixer
Boiler circuit, mixer circuit
A0:0 Without remote control
A3:2 Outside temperature
below 1 °C: Heating cir-
cuit pump "ON"
Outside temperature
above 3 °C: Heating cir-
cuit pump "OFF"
Note
When selecting a value
below 1 °C, there is a
risk of pipes outside the
thermal envelope of the
building being damaged
by frost. The standby
mode, in particular,
should be taken into
consideration, e.g. dur-
ing holidays.
Possible change
9C:0 No monitoring
9C:5 The time is adjustable
to from 5 to 60 min
9C:60
9F:0 Differential temperature
to adjustable from 0 to 40 K
9F:40
A0:1 With Vitotrol 200 (auto-
matic recognition)
A0:2 With Vitotrol 300 (auto-
matic recognition)
A3:-9 Heating circuit pump
to "ON/OFF" (see the fol-
A3:15 lowing table)
Coding
77