Viessmann VITOTRONIC 100 GC1B Operations Instructions download pdf (Page 123)

123

Function description

Boiler water temperature control (cont.)

Functions

The boiler water temperature is

recorded by three sensors

separately, which are inserted into a

multiple sensor well:

H High limit safety cut−out (STB)

(liquid expansion)

H Control thermostat TR

(liquid expansion)

H Boiler water temperature sensor KTS

(change in resistance PT 500)

Upper control range limits

H High limit safety cut−out STB

120 ºC, adjustable to 110 or 100 ºC

H Thermostat TR95ºC, adjustable to

100 or 110 ºC

H Electronic maximum limit

Setting range: 20 to 127ºC

Changes via coding address"06".

Lower control range limit

In standard mode and when frost

protection is active, the control unit

regulates the boiler water

temperature subject to the

respective boiler.

Control sequence

Boiler goes cold

(set value 2 K)

The burner start signal is set at the

set boiler water temperature less 2 K,

and the burner starts its own

monitoring program.

The burner start may be delayed by a

few minutes subject to the number

of the auxiliary circuits and the

combustion type.

Boiler heats up

The burner shutdown point is

determined by the shutdown

differential (coding address "13").

5862730GB

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Viessmann VITOTRONIC 100 GC1B Operations Instructions Page 123

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