95
Extension EA1
Fig. 62
A1
PCB
F1
Fuse/MCB
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)
aVG
KM BUS
Digital data inputs DE1 to DE3
The following functions can be connected alternatively:
■
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 safety
category II, i.e. 8.0 mm air and creep path or 2.0 mm
insulation thickness to 'live' parts.
Input function assignment
Select the input functions by means of codes in the
"General"
group at the boiler control unit:
■
DE1: Coding address 3A
■
DE2: Coding address 3b
■
DE3: Coding address 3C
Assigning the operating program changeover
function to the heating circuits
Assign the operating program changeover function for
the relevant heating circuit via coding address d8 in
group
"Heating circuit"
at the boiler control unit:
■
Changeover via input DE1: Code d8:1
■
Changeover via input DE2: Code d8:2
■
Changeover via input DE3: Code d8:3
Function description
External extensions (accessories)
(cont.)
5772 980 GB
Service