
TYPE OF REGUL.
HYSTERESIS
MIN TIME ON
Heating type Minimum source
switch-on time
Electric heating 1
Plate radiators 2 (3)
Cast iron radiators 4
Floor heating 5
9
PID = proportional-integral-derivative control
The PID-control principle consists in continuous
comparison of the current room temperature
with the desired temperature, and automatic
adaptation of the controller to the given
conditions. This is the most perfect continuous
control; you can achieve not only short control time,
but also high accuracy without permanent control
deviation. The minimum switch-on time is internally
set to 2 minutes, the proportional band is 2 °C, the
time interval is automatically recalculated according
to current temperature conditions.
Note: If the PID-control is selected, CONST 5 and CONST 6 are
skipped automatically.
PI = proportional-integral control
The PI-control principle consists in comparison
of the current room temperature with the desired
temperature. The PI-control aims at achieving and
maintaining the desired temperature without oversho-
oting (see the graph). For correct function of the PI-
control, set the control parameters according to the
type of the heating system with respect to the room
thermal inertia; see CONST 6.
Note: If the PI-control is selected, CONST 5 is skipped
automatically.
t
t
T
Topení
ON
požad.
teplota
PID-CONTROL
Note: The graphs are just tentative; the real con-
trol course differs according to current conditions
in the measured object!
t
t
T
Topení
ON
požad.
teplota pásmo
proporcionality
PI-CONTROL
CAUTION! ONLY IN CASE OF LOCKING BY PASSWORD (see CONST19)
If the “ “ key symbol appears on the LCD, the constant selected
cannot be modified and you must know the PASSWORD (page13,
CONST19). You can change the constant after entering the password.
After you exit the CONST mode, the security lock of the constants related
to the control will be activated automatically.
5SETTING HYSTERESIS PARAMETERS
(factory setting of 0.5°C)
(factory setting of 2min)
HYSTERESIS
MINIMUM SWITCH-ON TIME
Here you can set the minimum switch-on time of the boiler
in minutes at hysteresis. Select within the range
from 1 to 5 minutes according to the type of
the heating system used (see the table).
Set from 0.1 to 6 °C. According to the value preset, the
thermostat switches on at the temperature:
T switching = T required - HYSTERESIS
Choose the hysteresis by turning the “ “ and confirm “ “.
Set the value by turning the “ “ and confirm “ “.