Technical data

Installation
40
Connection of external controls
Operation with two-stage burner
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 building
automation system.
5285 941 v.1.5
The boiler activation contact is
essential on multi-boiler systems.
The contact on the lead boiler MUST
be constantly closed.
CAUTION