Viessmann VITOTRONIC 100 GC1 Installation And Service Instructions Manual page 14

Heating system types
Circuit Diagram 4
Possible applications
Heating systems in which there is no
facility for making modifications or
adjustments to the heating circuits
connected downstream, e.g. old
systems or market gardens.
IMPORTANT
This circuit diagram represents a
recommendation only. It is the
responsibility of the customer and/or
heating contractor to check that this
recommendation is complete and fully
functional. Three-phase equipment
must be connected via additional
power contactors.
Available system accessories
Flue gas temperature sensor
Coding of Change required
system type
00: 1
02: 1 Set coding "02: 2" for operation with
modulating burner
03: 0 Set coding "03: 1" for oil-fired operation
(re-setting is not possible)
0C: 4 Set coding "0C: 1" for continuous
return temperature control
4A: 0
4b: 0
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(continued)
When the return temperature falls
below the required minimum value,
the temperature sensor T2 switches
on the shunt pump. If, as a result,
the required minimum return
temperature is not reached, the return
valve is proportionally closed via the
temperature sensor T1 and the
minimum return temperature is
assured.
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Automatic change
With DHW tank:
Coding is automatically changed to "00: 2"
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Connection of the temperature sensor T1 at
plug aJA;
Coding is automatically changed to "4A: 1"
Connection of the temperature sensor T2 at
plug aJB;
Coding is automatically changed to "4b: 1"