Vitoligno 300-C Installation/Service
5790 980 - 04
128
Function Description
Control Functions
Solar circuit control
The solar circuit pump is controlled via the differential
temperature between the solar circuit and DHW heating
(coding address 6E). If the differential temperature
between the solar circuit and the DHW is above the set
value, the solar thermal system activates the pump and
mixing valve for heating DHW. The collector must have
a sufficient actual temperature available.
DHW is heated until the following conditions are met:
Max. DHW temperature (coding address 6F) is reached.
or...
Differential temperature between solar thermal system
and DHW heating (coding address 6E) is less than the
set
value.
In both cases, a check is carried out to see if the
differential temperature between the solar thermal system
and the heating water buffer tank (coding address 70) is
above the set value.
Heating circuit control unit
Brief description
The set supply temperature of each heating circuit
is determined from the following parameters:
– Outdoor temperature
– Set room temperature
– Operating mode
– Heating curve slope and shift
The supply temperature of the heating circuits is
controlled by the gradual opening or closing of the
mixing
valves.
The mixing valve motor control changes the actuating
and pause times subject to the control differential
(control
deviation).
Coding addresses that influence the heating circuit
control
unit:
A0 to FB.
For a description, see codes overview.
Functions
The heating circuit supply temperature is captured by the
supply temperature sensor.
Time program
In accordance with the times programmed in the “Heating”
program, the control unit time switch regulates between
central heating with standard room temperature and central
heating with reduced room temperature. Every operating
mode has its own set level.
Outdoor temperature
A heating curve must be set to adjust the control unit to
the building and the heating system. See “Setting heating
curves” page 69.
The heating curve characteristics determine the set supply
temperature subject to outdoor temperature. The control
unit regulates in line with an average outdoor temperature.
This is made up of the actual and the adjusted outdoor
temperature.
Legend
A
Heating curve for operation with standard room
temperature
B
Heating curve for operation with reduced room
temperature
Example using the settings in the factory set condition
