Function Description - Viessmann Vitotronic 100 Installation And Service Instructions Manual

EA1 extension
Fig. 38
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
Functions:
■ External blocking
■ External blocking with fault message input
External demand with set minimum boiler water tem-
■
perature
■ Fault message input
When connecting external contacts, observe the
requirements of protection class II, i.e. 8.0 mm air and
creep path or maintain a 2.0 mm insulation thickness
against live parts.
Analogue input 0 - 10 V
The 0 - 10 V hook-up provides an additional set boiler
water temperature:
0 - 1 V is taken as "no default for set boiler water tem-
perature".
Power supply
fÖ
A Power supply for additional accessories
fÖ
Switching contact (floating)
aBJ
KM BUS
aVG
Input function assignment
Select the input functions by means of codes in group
1 "General" at the boiler control unit:
DE1: Coding address "3A"
■
■ DE2: Coding address "3b"
■ DE3: Coding address "3C"
Note
Ensure DC separation between the earth conductor
and the negative pole of the on-site voltage source.

Function description

65