17 Description of function
2022/07
99E13331xx-mub-en - V08
39
NOTICE
If the three-way valve was not activated in the last 24 hours, it is opened and closed
automatically. This prevents that the valve seizes up after a longer downtime.
Parameters
Meaning
Adjustment range Factory setting
Stratification return Activate the function
On, Off
Off
Relay selection
Selection of the relay
Relay 1,
Relay 2
Relay 2
Thermostat mode
Submenu for settings of the
thermostat mode
On, Off
On
Switch-on
temperature
Switch-on temperature
20 ... 60 °C
35 °C
Hysteresis
Hysteresis
1 ... 20 K
5 K
Differential mode
Submenu for settings of the
differential mode
On, Off
Off
ΔT On
Switch-on temperature difference 1 ... 20 K
10 K
ΔT Off
Switch-off temperature difference 1 ... 20 K
6 K
Sensor selection
Selection of the sensor
T-CW, external
sensor (S2 (only
for FriwaMini),
S3)
T-CW
17.3
Modulating hot water temperature
This function adapts the defined nominal temperature of the hot water if the temperature level in
the storage tank is not sufficient.
The temperature is decreased when the flow temperature (T-FL) is lower than the nominal
temperature (D.H.W. set temperature) + 5 K.
The decreased nominal temperature is dynamically defined as follows:
Nominal temperature (new) = nominal temperature – 5 K.
After a new withdrawal, the controller starts with the decreased nominal temperature.
Only when the flow temperature (T-FL) is 12 K higher than the decreased nominal temperature,
it is increased again by 5 K.
Parameters
Meaning
Adjustment range
Factory setting
Modulating hot water
temperature
Activate the function On, Off
Off
