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

External extensions (accessories)

EA1 extension

Fig. 72
F1 Fuse
DE1 Digital input 1
DE2 Digital input 2
DE3 Digital input 3
0 10V 0 10 V input
– –
Digital data inputs DE1 to DE3
Alternatively, the following functions can 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 potential-free. When making
the connection, adhere to the requirements of protec-
tion class II: 8.0 mm air and creep paths and 2.0 mm
insulation thickness against live components.
(cont.)
Power supply
fÖ
A Power supply for additional accessories
fÖ
Central fault message/feed pump/DHW circula-
aBJ
tion pump (potential-free)
KM-BUS
aVG
Input function assignment
Select the input functions via the parameters in the
"General" group at the boiler control unit:
DE1: Parameter 3A
■
■ DE2: Parameter 3b
■ DE3: Parameter 3C
Assigning the operating program changeover
function to the heating circuits
Select the operating program changeover function for
the relevant heating circuit via parameter d8 in the
"Heating circuit" group at the boiler control unit:
■ Changeover via input DE1: Parameter d8:1
■ Changeover via input DE2: Parameter d8:2
Changeover via input DE3: Parameter d8:3
■
The effect of the operating program changeover is
selected via parameter d5 in the "Heating circuit"
group.
Function description
145