Viessmann EA1 - Page 9

9
Function assignment of inputs DE1 to DE3
Select the input functions by means of
the parameter settings on the heat gen-
erator control unit:
Digital input Control unit parameters (General
group)
DE1 42
DE2 43
DE3 44
Depending on the function and the digi-
tal input selected for it, set the following
parameters at the Vitotronic control
unit:
Function Settings at parameters 42, 43,
44 (General group)
No function 0
Operating program changeover 1
External demand with set flow temperature 2
External blocking 3
External blocking with fault message input 4
Fault message input 5
Brief operation, DHW circulation pump 6
Complete description of the parame-
ters:
Control unit or heat generator
installation and service instruc-
tions
Assigning the operating program
changeover function to the heating
circuits
Select assignment of the operating pro-
gram changeover function for the rele-
vant heating circuit via parameter 20
(Heating circuit group) at the control
unit:
■ Changeover via input DE1: Parame-
ter 20:1
■ Changeover via input DE2: Parame-
ter 20:2
■ Changeover via input DE3: Parame-
ter 20:3
Connecting digital inputs (group D)
(cont.)
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