External Extension; Ea1 Extension - Viessmann Vitoladens 300-C Installation And Service Instructions Manual

External extension

EA1 extension

Fig. 67
F1 Fuse
DE1 Digital input 1
DE2 Digital input 2
DE3 Digital input 3
0 10 V 0 10 V input
– –
Power supply
fÖ
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.
A Power supply for additional accessories
fÖ
Central fault message/feed pump/DHW circu-
aBJ
lation pump (potential-free)
Connect DHW circulation pumps with stand-
alone functions directly to the 230 V
KM-BUS
aVG
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
∼
supply.
91