Viessmann VITOTRONIC 100 GC1B Service Manual download pdf (Page 63)

Installation

Connection of External Controls (VD2/VD2A only) (continued)

Modulating boilers – operation with external modulation controller

Settings on the control unit

The settings for the fixed high limit and

the other settings are dependent on the

safety equipment installed in

accordance with applicable codes.

Non-condensing boiler

(VD2/VD2A) °C / °F

Condensing boiler

(CT3) °C / °F

Condensing boiler

(CM2) °C / °F

Fixed high limit 110 / 230 99 / 210 99 / 210 99 / 210

Adjustable high limit 100 / 212 95 / 203 95 / 203 95 / 203

Coding for the electronic maximum

temperature limiter of Vitotronic 100;

set code 06 to the temperature as

shown or less

93 / 200 87 / 188 87 / 188 88 / 190

Single-boiler systems:

Coding ”01: 1”

(factory setting)

When a building automation system is

connected, only the connections on

plug aVD are required. The DHW tank

control unit is activated when the DHW

tank temperature sensor is connected.

The boiler water temperature must be

set to the minimum value.

Multi-boiler systems:

Set coding ”01: 3”

When a building automation system

is connected, the connections on

plugs aVD and aVH are required. The

DHW tank temperature and the

load-dependent cascade control

must be controlled through the

external building automation system.

5351 338 v1.6

The boiler activation contact is

essential on multi-boiler systems.

The contact on the lead boiler must

be constantly closed.

CAUTION

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Viessmann VITOTRONIC 100 GC1B Service Manual Page 63

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