Viessmann VITOTRONIC 300-K Operations Instructions download pdf (Page 83)

5693 976 - 04

Vitotronic 200 and 300-K Installation and Service

Function Description, Vitotronic 300-K

Heating Circuit Control (continued)

System dynamics mixing valve circuit

You can influence the control characteristics of the mixing

valve via coding address “C4”.

Central control

Central control for a heating circuit can be programmed

via coding address “7A” in the “General” group.

The heating and holiday program then applies to all

additional heating circuits of the system.

For these heating circuits, when the heating and holiday

program is enabled, “Central control” is displayed.

Any holiday programs that may have been set will be

deleted.

Party and economy modes cannot be enabled on all

control units.

Differential temperature:

The differential temperature is adjustable via coding

address “9F” in the “General” group, factory set

condition: 8 K.

The differential temperature is the minimum value by

which the boiler water temperature should be higher

than the highest currently required supply temperature

of the heating circuit with mixing valve.

H System with only one heating circuit with mixing valve:

The set boiler water temperature will be automatically

regulated to 8 K above the set supply temperature.

H System with heating circuit without mixing valve

and heating circuit with mixing valve: The set boiler

water temperature operates in accordance with a

special heating curve. The differential temperature of

8 K towards the set supply temperature is set at the

factory.

Legend

A Max. boiler water temperature

B Slope = 1.8 for heating circuit without mixing valve

C Slope = 1.2 for heating circuit with mixing valve

D Boiler water temperature (with a differential

temperature = 8 K)

E Lower boiler water temperature, defaulted by the

boiler coding card

Supply temperature control

Frost protection

The supply temperature is maintained in accordance with

the heating curve for the reduced set room temperature,

but at min. 50°F (10°C).

A variable frost limit can be set in accordance with coding

address “A3” in the “Heating circuit...” group.

Example using the settings in the factory set condition

Legend

A Heating curve for operation with standard room

temperature

B Heating curve for operation with reduced room

temperature

Boiler water or

Supply temperature

Outside temp.

Set room temperature

Outside temperature

Supply temperature

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 95 96

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Viessmann VITOTRONIC 300-K Operations Instructions Page 83

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