Setting multi-function controllers (MFC)
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6.4
Setting the "Threshold value switch" function
In the case of the "Threshold value switch" function, the switching output of the multi-
function controller switches on as soon as the temperature reaches the preset switch-on
temperature. If the temperature drops below or rises above the preset temperature range
(hysteresis), the switching output of the multi-function controller switches off.
To use this function for heating, set the "Hysteresis" value to greater than 0. To use this
function for cooling, set the "Hysteresis" value to less than 0.
For this function you can set the following parameters:
•
Basic settings/MFC 1-6/Source sensor, Output
•
Program/MFC 1-6/Setpoint temperature
•
Program/MFC 1-6/Hyteresis
6.5
Setting the "Return line boost" function
To save energy, energy is supplied to the heating return flow from the solar circuit or
storage tank. The mode of operation and relevant parameters are similar to those of the
"Temperature difference controller" function.
6.6
Setting the "Wood-fired boiler" function
This function allows you to re-heat the storage tank from a solid fuel boiler. The switching
output of the multi-function controller will be activated if the boiler temperature (source
sensor) plus the selected temperature range (hysteresis) exceeds the storage tank
temperature (sink sensor).
In addition you can also define a switch-on temperature (Tmin source). In this case the
pump will not start until the switch-on temperature has been reached.
With this function the storage tank will be heated to a maximum temperature of 95 °C.
For this function you can set the following parameters:
•
Basic settings/MFC 1-6/Source sensor, Sink sensor, Output
•
Basic settings/MFC 1-6/Speed
•
Program/MFC 1–6/Tmin source
•
Program/MFC 1-6/Hysteresis
6.7
Setting the "Circulation" function
This function provides you with hot water at all times. You can choose from the following
control types:
•
Temperature-controlled
•
Time-controlled
