Viessmann Vitodens 242-F Installation And Service Instructions Manual page 77

"General"
(cont.)
Coding in the delivered condition
3C:0 Function of DE3 input at EA1 ex-
tension:
No function
3d:5 DHW circulation pump runtime for
brief operation: 5 min
3E:0 Internal circulation pump stays in
control mode at signal "External
blocking"
3F:0 Internal circulation pump stays in
control mode at signal "External
demand"
4b:0 Function of input
Possible change
3b:3
3b:4
3b:5
3b:6
3C:1
3C:2
3C:3
3C:4
3C:5
3C:6
3d:1
to
3d:60
3E:1
3E:2
3F:1
3F:2
: No function 4b:1
lH
4b:2
Set value setting: Coding address
"9b" in this group.
Internal circulation pump function:
Coding address "3F" in this group.
Function of DE2 input: External
blocking.
Internal circulation pump function:
Coding address "3E" in this group.
Function of DE2 input: External
blocking with fault message input
Internal circulation pump function:
Coding address 3E
Function of DE2 input: Fault mes-
sage input
Function of DE2 input: Brief opera-
tion, DHW circulation pump (keypad
function).
Setting, DHW circulation pump run-
time: Coding address 3d
Heating program changeover
External demand with set flow tem-
perature.
Set value setting: Coding address
"9b" in this group.
Internal circulation pump function:
Coding address "3F" in this group.
External blocking.
Internal circulation pump function:
Coding address "3E" in this group.
External blocking with fault message
input
Internal circulation pump function:
Coding address "3E" in this group.
Fault message input
Brief operation, DHW circulation
pump (keypad function).
Setting, DHW circulation pump run-
time: Coding address "3d" in this
group
DHW circulation pump runtime ad-
justable from 1 to 60 min
Internal circulation pump stops at
signal "External blocking"
Internal circulation pump starts at
signal "External blocking"
Internal circulation pump stops at
signal "External demand"
Internal circulation pump starts at
signal "External demand"
External demand
External blocking
Code 2
77