Viessmann VITOTRONIC 100 GC1B Service Manual download pdf (Page 16)

Heating system types

Circuit Diagram 5 (continued)

Possible applications

Heating systems with manifold

arranged close to the boiler. The boiler

water supply is reduced via the

motorized isolation valve.

On multi-boiler systems without the

Vitotronic 333, 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.

When the return temperature falls

below the required minimum value,

the temperature sensor T2 switches

on the shunt pump. If the minimum

return temperature is not reached

despite raising the return temperature,

the supply must be reduced by at

least 50% via the temperature

sensor T1, through the isolation

valve or the heating circuit controls.

The shunt pump must be sized so

that bypassed water accounts for

approx. 30% of the total supply rate

of the boiler.

The boiler is assured optimum

protection in conjunction with control

of the heating circuits via the

Vitotronic 050 connected to the

boiler control unit. No further

protective measures are required on

site.

Temperature sensor T1

Wiring of the temperature sensor T1

in heating systems with heating

circuit control units which are not

connected via the LON BUS to the

boiler control unit.

Coding required: ”4C: 2” – use plug

sÖ for closing the mixing valves of

the heating circuits connected

downstream.

sÖ A1 Close mixing valves

A Contactor relay, field supplied

B Heating circuit controls

connected downstream

Switch contact closed: signal

for ”close mixing valve”.

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

–––

03: 0 Set coding ”03: 1” for oil-fired operation

(re-setting is not possible)

–––

4A: 0 ––– Connection of the temperature sensor T1 at

plug aJA;

Coding is automatically changed to ”4A: 1”

4b: 0 ––– Connection of the temperature sensor T2 at

plug aJB;

Coding is automatically changed to ”4b: 1”

5351 338 v1.6

IMPORTANT

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Viessmann VITOTRONIC 100 GC1B Service Manual Page 16

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