Vemer Dafne - Regulation Logic Details; Regulation Type Explanation

English
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Dafne chronothermostat, user’s manual
6. Once all parameters are set, to exit and go back to the programming menu, press for a
short time the key
.
To exit and go back to the normal operation press for a long time the key
or wait for
the time-out expiration (30 seconds about).
REGULATION TYPE
The chronothermostats of Dafne series have two types of regulation:
On/off regulation
During on/off regulation the chronothermostat measures once a minute the
environment temperature and it carries out the regulation on the basis of 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 represents the setpoint and DIFF the differential (useful to avoid continuous
switches on/switches off dangerous for the system in proximity to the reaching of the
setpoint).
Proportional regulation (heating only)
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, which represents the temperature values within whom to perform the
proportional regulation. The band is centered on the setpoint and it can have values
between 0.5°C and 5°C; outside these values the heating will be
always on (if setpoint-band > environment temperature) or
always off (if setpoint + band < measured temperature).