Viessmann VITOTRONIC 100 GC1 Installation And Service Instructions Manual page 22

Heating system types
Circuit Diagram 8
Possible applications
E.g. old systems or systems in market
gardens as well as systems in which
there is a lack of clarity in the hydraulic
installation and/or systems where there
is no facility for making modifications
or adjustments to the heating circuits
connected downstream.
The cascade and DHW tank control
must be activated by a building
automation system.
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
01: 1 Set coding "01: 3" for multi-boiler system
with external cascade control via switch
contacts
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
4d: 1 Set coding "4d: 2" for boiler circuit pump
at plug sL
22
(continued)
When the return temperature falls
below the required minimum value,
the return valve on the boilers is
proportionally closed via the
temperature sensor T1, thereby
assuring protection of the boiler.
The supply temperature is controlled
by the temperature sensor in the
low-loss header.
CAUTION
The boiler circuit pumps on each
boiler must be sized so that their
supply is at least equal to the
maximum possible total heating
circuit supply.
Recommendation: 110%.
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Automatic change
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Connection of the temperature sensor T1 at
plug aJA;
Coding is automatically changed to "4A: 1"
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