Ea1 Extension - Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors

External extensions (accessories)

EA1 extension

Fig. 55
F1 MCB/fuse
DE1 Digital input 1
DE2 Digital input 2
DE3 Digital input 3
0 10V 0 10 V input
– –
Power supply
fÖ
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.)
A Power supply for additional accessories
fÖ
Central fault message/feed pump/DHW circula-
aBJ
tion 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 codes in the "Gen-
eral" 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
Select the operating program changeover function for
the respective heating circuit via coding address d8 in
the "Heating circuit" group 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
■
The effect of the operating program changeover is
selected via coding address d5 in the "Heating cir-
cuit" group.
Function description
∼
supply.
95