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CHRONOS KEY Programmable Thermostat User Manual
• The regulation period stands for the duration of the regulation cycle (activation time
+ deactivation time of heating) and can have values of 10, 20 or 30 minutes.
During the operation, at the beginning of the regulation period, the instrument
measures the environment temperature and compares it to the programmed setpoint:
according to this difference the activation time is calculated (and consequently the
deactivation time). When the measured temperature is next to the setpoint value –
band, the activation time will be predominant compared to the deactivation time. On
the contrary, when the measured temperature is next to the setpoint value + band, the
deactivation time will be predominant compared to the activation time.
After the regulation period, the instrument compares again the environment
temperature to the setpoint and it updates the activation and deactivation times for the
new period.
The result of the proportional regulation is subordinated to the correct selection of the
parameters.
Select the value of the regulation period as follows:
• 10’ for low thermal inertia systems (fan-coil)
• 20’ for medium thermal inertia systems (aluminium radiators)
• 30’ for medium thermal inertia systems (cast iron radiators)
Select the regulation band value as follows:
• broad band (5°C) for systems with high thermal gradient
• narrow band (0.5°C) for systems with low thermal gradient
Attention: in default status the instrument is confi gured to operate in on/off
mode with hysteresis set at 0.3°C. This confi guration is suitable for the most
part of the situations, for this reason it is recommended to modify it only in
particular situations.
To modify the regulation type, hysteresis values (on/off regulation), band and
period (proportional regulation) see “Regulation parameters” at page 18).
To modify the regulation type, hysteresis values (on/off regulation), band and
period (proportional regulation) see “Regulation parameters” at page 18).
