Viessmann VITOTRONIC 100 GC1B Service Manual download pdf (Page 32)

Heating system types

Circuit Diagram 13 (continued)

Possible applications

For heating circuits with temperature

differences ≥20 K.

The cascade and DHW tank control

must be activated by a building

automation system.

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.

The Vitocrossal 300 (lead boiler) and

the Vitorond lag boilers are operated

with modulating boiler water

temperature and load-dependent

sequential control by means of the

outdoor-reset logic control system.

Two-stage or modulating burners

can be controlled.

Through the control system which is

linked via the LON BUS, the boiler

supply temperature which is

established is higher than the

maximum heating circuit supply

temperature by an adjustable

difference. The heating system can

be operated in accordance with a

separate heating curve.

The Vitocrossal 300 boilers have

two return connections. The heating

circuits with the higher return

temperature are connected to the

return connection at the top, those

with the lower temperatures to the

return connection at the bottom.

Please note:

At least 15 % of the

take-off from the rated output must

be connected to the return connection

at the bottom.

The T1 temperature sensor measures

the return temperature.

The return valve is activated via the

boiler control unit so as to ensure that

the return temperature does not fall

below the minimum value.

Available system accessories

 Flue gas temperature sensor

Coding of

system type

Change required Automatic change

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

–––

0C: 4 Only with Vitotronic 100 for the Vitocrossal

300:

Set coding ”0C: 0”

Only with Vitotronic 100 for the Vitorond

300: Set coding ”0C: 1” for continuous

return temperature control

–––

0d: 2 Only with Vitotronic 100 for the Vitocrossal

300:

Set coding ”0d: 0”

–––

4A: 0 ––– Only with Vitotronic 100 for the Vitorond:

Connection of the Therm-Control temperature

sensor at plug aJA;

Coding is automatically changed to ”4A: 1”

4d: 1 Only with Vitotronic 100 for the Vitocrossal

300:

Set coding ”4d: 2” for boiler circuit pump at

plug sL

5351 338 v1.6

IMPORTANT

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Viessmann VITOTRONIC 100 GC1B Service Manual Page 32

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