Viessmann VITOTRONIC 300-K Operations Instructions download pdf (Page 93)

5693 976 - 04

Vitotronic 200 and 300-K Installation and Service

Components

Extension EA1 Accessory (optional)

The DHW recirculation pump is started by closing the

contact at DE1, DE2 or DE3 by means of a pushbutton.

The runtime is adjusted via coding address “3D” in the

“General” group.

Analogue input 0–10V

The 0–10V hook-up provides an additional set boiler

water temperature:

0–1V Is taken as “no default for set boiler water

temperature”.

Note: Ensure DC separation between the LV output

and the earth conductor of the on-site voltage

source.

Coding address “1E” in the “General” group:

“1E:0” ≙ temperature demand adjustable in the

range from 32 to 212°F (0 to 100°C) 1V ≙ 50°F

(10°C) set value change 10V ≙ 212°F (100°C)

set value change

“1E:1” ≙ temperature demand adjustable in the

range from 86 to 248°F (30 to 120°C) 1V ≙ 86°F

(30°C) set value change 10V ≙ 248°F (120°C)

set value change

Output aBJ

Connection of a central fault messaging facility or

signalling reduced mode (reduction of the heating

circuit pump speed).

Select the function of output aBJ via coding address

“5C” in the “General” group.

Digital data inputs DE1 to DE3

Functions:

External heating program changeover,

separate for heating circuits 1 to 3

External blocking

External blocking with fault message input

External demand with minimum boiler water

temperature

Fault message input

Brief operation of the DHW recirculation pump

When connecting external contacts, observe the

requirements of safety category II, i.e. 8.0 mm air-gap

and creep path or maintain a 2.0 mm insulation thickness

against ‘live’ parts.

Input function assignment

Select the input functions by means of the following

codes in the “General” group at the boiler control unit:

DE1: Coding address “5D”

DE2: Coding address “5E”

DE3: Coding address “5F”

Assigning the heating program changeover

function to the heating circuits

The allocation of the heating program changeover to the

relevant heating circuit is selected via coding address

“D8” in the “Heating circuit...” group:

Code “D8:1”: Changeover via input DE1

Code “D8:2”: Changeover via input DE2

Code “D8:3”: Changeover via input DE3

The effect of the heating program changeover is selected

via coding address “D5” in the “Heating circuit...” group.

Duration of the heating program changeover

Contact constantly closed:

The changeover is active as long as the contact

is closed.

Contact only closed briefly via pushbutton:

The changeover is enabled for the time selected in

coding address “F2” in the “Heating circuit...” group.

DHW recirculation pump runtime for brief operation

The DHW recirculation pump can be started outside the

times when it is enabled according to the time program.

Refer to the EA1 module Installation Instructions

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Viessmann VITOTRONIC 300-K Operations Instructions Page 93

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