85
EA1 extension
Fig. 48
DE1
Digital input 1
DE2
Digital input 2
DE3
Digital input 3
F1
Fuse
0 - 10 V 0 to 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)
aVG
KM-BUS
Digital data inputs DE1 to DE3
The following functions can alternatively be connected:
■
External operating program changeover for one
heating circuit each
■
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 potential-free. When con-
necting external contacts, observe the requirements of
protection class II: 8.0 mm air and creep path or
2.0 mm insulation thickness to live parts.
Input function assignment
The functions of the inputs are selected via the codes
on the boiler control unit:
■
DE1: Code 3A
■
DE2: Code 3b
■
DE3: Code 3C
Assigning the operating program changeover
function to the heating circuits
The heating program changeover function for the
respective heating circuit is assigned at the boiler con-
trol unit via code d8:
■
Changeover via input DE1: Code d8:1
■
Changeover via input DE2: Code d8:2
■
Changeover via input DE3: Code d8:3
The effect of the heating program changeover is selec-
ted with code d5.
Set the duration of the changeover via code F2.
Function description
External extension (accessories)
(cont.)
5839829
Functions
