Viessmann Vitovalor 300-P Installation And Service Instructions For Contractors page 100

Codes
Coding level 2
(cont.)
Coding in the delivered condition
3C:0 Function of input DE3 at EA1 ex-
tension:
No function
3d:5 Runtime of DHW circulation pump
during brief operation: 5 min
3E:0 Internal circulation pump stays in
control mode on signal "External
blocking".
3F:0 Internal circulation pump stays in
control mode on signal "External
demand".
4b:0 Function of input
51:0 The internal circulation pump al-
ways starts when there is a heat
demand.
100
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
lH : No function 4b:1
4b:2
51:1
Internal circulation pump function:
Coding address "3F" in this group.
Function of input DE2: External
blocking.
Internal circulation pump function:
Coding address "3E" in this group.
Function of input DE2: External
blocking with fault message input
Internal circulation pump function:
Coding address 3E
Function of input DE2: Fault mes-
sage input
Function of input DE2: Brief opera-
tion of DHW circulation pump (key-
pad function).
Adjusting DHW circulation pump
runtime: 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 of DHW circulation
pump (keypad function).
Adjusting DHW circulation pump
runtime: Coding address "3d" in this
group
Runtime of DHW circulation pump
adjustable from 1 to 60 min
Internal circulation pump stops on
signal "External blocking".
Internal circulation pump starts on
signal "External blocking".
Internal circulation pump stops on
signal "External demand".
Internal circulation pump starts on
signal "External demand".
External demand
External blocking
System with low loss header: