Vemer Chronos Key - Regulation Type

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CHRONOS KEY Programmable Thermostat User Manual
6. Once all parameters are set, to exit and to go back to the programming menu, press for
a short time the key
.
To exit and to go back to the normal operation press the key
for a long time or
wait for the time-out expiration (about 30 seconds).
REGULATION TYPE
The Chronos Key has two types of regulation:
On/off regulation
During on/off regulation the programmable thermostat measures once a minute the
environment temperature and performs the regulation according to the following logic:
relay ON
SET-DIFF SET
relay OFF
Temperature
increasing
relay ON
SET+DIFFSET
relay OFF
Temperature
increasing
heating mode cooling mode
where SET stands for the setpoint and DIFF stands for the hysteresis (useful to avoid
continuous switches on/off dangerous for the system in proximity to the reaching of
the setpoint).
Proportional regulation (only for heating)
In heating mode, the on/off regulation is available and also the proportional regulation
which in some systems allows a more precise regulation to obtain a constant
temperature.
This regulation requires to specify two parameters:
• the band, stands for the temperature values to perform the proportional regulation.
The band is centered on the setpoint and it can have values between 0.5°C
and 5°C; beyond these values the heating will be always on (if setpoint-band
> environment temperature) or always off (if setpoint + band < environment
temperature).