Ea1 Extension - Viessmann VITODENS 200-W Installation And Service Instructions Manual

External extensions (accessories)

EA1 extension

Fig.72
F1 MCB/fuse
DE1 Digital input 1
DE2 Digital input 2
DE3 Digital input 3
0 10 V 0 10 V input
– –
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
■
(cont.)
Power supply
fÖ
A Power supply for additional accessories
fÖ
Central fault message/feed pump/DHW circu-
aBJ
lation pump (potential-free)
KM BUS
aVG
External contacts must be floating. When making the
connection, adhere to the requirements of safety cate-
gory II: 8.0 mm air and creep paths and 2.0 mm insula-
tion thickness against 'live' components.
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
■
Function description
119