Product Information; Weather-Compensated Operation - Viessmann Vitodens 100-W Operating Instructions Manual

Introductory information
Intended use
(cont.)
Incorrect usage or operation of the appliance (e.g. the
appliance being opened by the system user) is prohibi-
ted and will result in an exclusion of liability. Incorrect
usage also occurs if the components in the heating
system are modified from their intended use (e.g. if the
flue gas and ventilation air paths are sealed).

Product information

The control unit is a boiler and heating circuit control
unit for the following operating modes:

Weather-compensated operation

■
■ Constant operation with time program
■ Room temperature-dependent operation:
– Constant operation as option with room tempera-
ture controller
OpenTherm controller
–
■ Individual room control with/without modulation
Weather-compensated operation
In weather-compensated operation, the flow tempera-
ture level is controlled according to the outside temper-
ature. The lower the outside temperature, the higher
the flow temperature. This means that more heat is
provided for central heating on cold days than on
warmer days.
Constant operation with time program
In constant operation the heat generator provides
heating water with a constant flow temperature regard-
less of the outside temperature.
Heating times are controlled by a time program.
Room temperature-dependent operation
In room temperature-dependent operation, the central
heating is switched on or off subject to the room tem-
perature. The flow temperature remains constant.
In room temperature-dependent operation, 1 heating
circuit without mixer can be operated with the control
unit.
Constant operation as option with room tempera-
ture controller
In constant operation with room temperature controller,
the control unit measures the room temperature and
compares it with the selected required room tempera-
ture. If the temperatures are different, the room tem-
perature is controlled to the required value.
10
Your heating contractor will configure the operating
mode during commissioning in accordance with your
heating system.
These instructions describe all 4 operating modes.
The setting options for room temperature-dependent
operation with an OpenTherm controller via the system
are limited:
OpenTherm controller operating instructions
In weather-compensated operation, 1 heating circuit
without mixer and 1 heating circuit with mixer can be
operated with the control unit.
In constant operation, 1 heating circuit without mixer
and 1 heating circuit with mixer can be operated with
the control unit.
Note
The heating water temperature must be set high
enough in order to achieve the required room tempera-
ture.
Operating instructions for room temperature
controller
OpenTherm controller
In room temperature-dependent operation, the central
heating is switched on or off subject to the room tem-
perature. The flow temperature remains constant.