Ea1 Extension, Part No. 7452 091; Digital Inputs De1 To De3 - Viessmann VITOTRONIC 200 Installation And Service Instructions Manual

EA1 extension, part no. 7452 091

Fig.61
F1 MCB/fuse
DE1 Digital input 1
DE2 Digital input 2
DE3 Digital input 3
0 10 V 0 10 V input
– –

Digital inputs DE1 to DE3

Functions:
■ External operating program changeover for heating
circuits 1 to 3 separately
External blocking
■
External blocking with fault message input
■
■ External demand with set minimum boiler water tem-
perature
■ Fault message input
■ Brief operation of the DHW circulation pump
Power supply
fÖ
A Power supply for additional accessories
fÖ
Switching contact (floating)
aBJ
KM BUS
aVG
When connecting external contacts, observe the
requirements of safety category II, i.e. 8.0 mm air and
creep paths and maintain a 2.0 mm insulation thick-
ness against 'live' parts.
Components
91