Viessmann VITOTRONIC 300 GW2 Installation And Service Instructions Manual page 42

Installation
Connection of external controls (VD2/VD2A only)
Modulating boilers – operation with external modulation controller (continued)
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.
Fixed high limit
Adjustable high limit
Coding for the electronic maximum
temperature limiter of Vitotronic 100;
set code 06 to the temperature as
shown or less
42
Non-condensing boiler
(VD2/VD2A) °C / °F
110 / 230 99 / 210
100 / 212 95 / 203
93 / 200 87 / 188
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.
(continued)
Condensing boiler Condensing boiler
(CT3) °C / °F (CM2) °C / °F
99 / 210
95 / 203
87 / 188
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.
CAUTION
The boiler activation contact is
essential on multi-boiler systems.
The contact on the lead boiler
MUST be constantly closed.
99 / 210
95 / 203
88 / 190