107
EA1 extension
Fig. 69
F1
Fuse
DE1
Digital input 1
DE2
Digital input 2
DE3
Digital input 3
0
–
10 V 0
–
10 V input
fÖ
Power supply
fÖ
A
Power supply for additional accessories
aBJ
Central fault message/feed pump/DHW circu-
lation pump (potential-free)
Connect DHW circulation pumps with stand-
alone functions directly to the 230 V
∼
supply.
aVG
KM-BUS
Digital data inputs DE1 to DE3
The following functions can alternatively be connected:
■
External operating program changeover for each
heating circuit
■
External blocking
■
External blocking with fault message input
■
External demand with minimum boiler water temper-
ature
■
Fault message input
■
Brief operation of the DHW circulation pump
External contacts must be floating. When connecting
external contacts, observe the requirements of protec-
tion class II: 8.0 mm air and creep path or 2.0 mm
insulation thickness to live parts.
Input function assignment
Select the input functions via the parameter changes/
codes in the
"General"
group at the boiler control unit:
■
DE1: Parameter/coding address 3A
■
DE2: Parameter/coding address 3b
■
DE3: Parameter/coding address 3C
Assigning the operating program changeover
function to the heating circuits
Select the operating program changeover function for
the relevant heating circuit via parameter/coding
address d8 in the
"Heating circuit"
group at the boiler
control unit:
■
Changeover via input DE1: Parameter/code d8:1
■
Changeover via input DE2: Parameter/code d8:2
■
Changeover via input DE3: Parameter/code d8:3
Function description
External extensions (accessories)
(cont.)
5778741
Functions
