External Operating Program Changeover - Viessmann Vitotronic 300 GW6B Installation Instructions Manual

Electrical Connections

External Operating Program Changeover

Plug aVD
Legend
A Floating contact
B Plug aVD of the control unit
EA1 extension
The changeover can be achieved separately for heating
circuits 1 to 3.
Legend
A Dry contact (potential free)
B EA1 extension
44
Vitotronic 300, GW6B Installation and Service
Only for single boiler and cascade control units
Connection options:
H Plug aVD.1/aVD.2
Note: In the case of cascade control units make the
connection on the EA1 extension.
H EA1 extension (accessory, see page 122)
Connection
Note: 'Live' contacts lead to short circuits or phase failure.
The external connection must be potential-free.
Preselected operating
program
(Contact open)
Central
9
heating OFF/
DHW OFF
or
Central
w
heating OFF/
DHW
heating ON
or
w
Central
heating ON/
DHW
heating ON
Coding
Plug aVD
This function can be assigned to the heating circuits
at coding "91" in the "General" group.
Note: Never adjust coding "91:0" in a cascade
control unit.
EA1 extension
Set "5d" (DE1), "5e" (DE2) or "5f" (DE3) in group
"General" to 1.
This function can be assigned to the heating circuits
at coding "d8" in the "Heating circuit..." group.
Coding Changed operating
program
(Contact closed)
"d5:0" in Constant
the operation with
"Heating reduced
circuit ..." room temperature/
group DHW heating OFF
(Factory
set
condition)
"d5:1" in Constant
the operation with
"Heating standard
circuit ..." room temperature,
group DHW heating
in accordance
with coding
"64" in the
"DHW" group