Viessmann VITOTRONIC300 Installation And Service Instructions Manual page 105

Vitotronic 300, GW2B Installation and Service
"General" Group
Coding in the factory set condition
9A:0
Connection at terminals 1 and 2 in plug aVD
disabled (external "Mixing valve open")
(see page 48).
9b:70 Set supply temperature for external demand
158°F (70°C).
9C:20 With LON communication module:
Monitoring LON participants.
If there is no response from a participant
after 20 min, the values specified inside the
control unit are used. Only then will a fault
message be issued.
9d:0 Do not adjust
9F:8 Differential temperature 8 K; only in
conjunction with heating circuits with mixing
valve M2 and M3.
(continued)
Possible change
9A:1 No function.
9A:2 External "Mixing valve open"
Heating circuit with mixing valve M2
(heating circuit 2).
9A:3 No function.
9A:4 External "Mixing valve open"
Heating circuit with mixing valve M3
(heating circuit 3).
9A:5 No function.
9A:6 External "Mixing valve open"
Heating circuits with mixing valve M2
(heating circuit 2) and M3 (heating circuit 3).
9A:7 No function.
9b:0 Set value adjustable from 32 to 261°F
to (0 to 127°C).
9b:127 (limited by boiler specific parameters).
9C:0 No monitoring.
9C:5 Time adjustable from 5 to 60 min.
to
9C:60
- -
9F:0 Differential temperature adjustable from
to 0 to 40 K.
9F:40
Code 2
105