Extension Ea1 - Viessmann Vitodens 200-W Series Installation And Service Instructions Manual

External extensions (accessories)

Extension EA1

Fig. 60
A1 PCB
F1 Fuse/MCB
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
■
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.
(cont.)
Power supply
fÖ
A Power supply for additional accessories
fÖ
Central fault message/feed pump/DHW circu-
aBJ
lation pump (potential-free)
aVG KM BUS
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
95