6
!
Please note
Electronic assemblies can be
damaged by electrostatic loads.
Before beginning work, touch
earthed objects, such as heating
or water pipes, to discharge
static loads.
Note
Apply strain relief to on-site cables.
Seal any unnecessary apertures with
cable grommets (not cut open).
Connecting digital inputs (groups A and B)
The following functions can alterna-
tively be connected:
■ External operating program change-
over for each heating circuit
■ External blocking
■ External blocking with central fault
message input
■ External demand with set flow tem-
perature
■ Central fault message
■ Brief operation of the DHW circula-
tion pump
This function is enabled when the input
is closed.
External contacts must be potential-
free. When connecting external con-
tacts, observe the requirements of pro-
tection class II, i.e. 8.0 mm air and
creep path or 2.0 mm insulation thick-
ness to live parts.
Function assignment of inputs DE1 to DE3
Select the input functions by means of
the codes on the heat generator control
unit:
Digital input Control unit coding address
Group A Group B
DE1 3A 5d
DE2 3b 5E
DE3 3C 5F
Depending on the function and the digi-
tal input selected for it, set the following
codes at the Vitotronic control unit:
Overview of electrical connections
(cont.)
5443233
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