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DS1054-057A P18
IMPORTANT: The thermostat is configured by default to operate in on/off mode with differential set at 0.3°C.
(1) Thermarp when used with TPI adjustment mode complies with Control Class IV of the ErP/Energy related
Products Directive of 26/09/2015.
Time Proportional & Integral (TPI) control reduces the average temperature of the heating water, improves
ambient temperature control accuracy and increases the overall system efficiency.
The ErP Directive estimates that TPI control allows a seasonal energy saving of 2%.
(2) Example: with SET= 19°C BAND=1°C and TA=19.3°C, the on % is equal to 35%. If the set period is 20 minutes,
we will have an on time of 7 minutes, followed by an off time of 13 minutes.
(3) The ambient temperature gradient is the temperature variation curve between floor and ceiling. Floor systems
generate a minimum thermal gradient, close to the optimum, with very similar floor and ceiling temperatures.
Radiator systems and especially connector systems generate a higher gradient curve, in which the ceiling
temperature is higher than the floor temperature.
Vertical thermal gradient with different types of heating elements
ideal conditions
panel systems
radiator systems
fan coil systems
Temperature (°C)
Height (m)
7.5.3.3. Emergency control (winter operation only)
The thermostat makes an emergency adjustment if an error occurs during the reading of the sensor or if the time
is lost.
In case of sensor error, if the antifreeze function is not excluded, the thermostat activates the load for 10 minutes
every 4 hours. The display shows “Err” in field (7).
In the event of a loss of time (due to battery discharge or blackout lasting longer than the power reserve), the
thermostat restarts from off operation, adjusting according to the antifreeze temperature, if it has not been
previously deactivated. Reset the date/time to return to normal operation (program changes and settings are
retained in memory).
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