Applicatio Manual
Universal Interface 4 DIN/NTC EK- CG2-TP
Revisione 1.0.0 - Aggiornato: 04/09/2017
© SBS S.p.A.
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MAEKCG2TP_EN
Pag. 19
Heating mode
– When the measured temperature is lower than the desired temperature T
set
, the device activates
the heating system by sending a message or KNX telegram to the actuator that handles it; when the measured
temperature reaches the value (T
set
+
ΔT
hysteresis
), whereby
ΔT
hysteresis
identifies the differential adjustment of the
boilers the device disables the heating system by sending another message. In this way, there are two decision
thresholds for activation and deactivation of the heating, the first being the desired temperature T
set
below which
the device activates the system, whereas the second is the value (T
set
+
ΔT
hysteresis
), above which the heating
system is deactivated.
Cooling mode
– When the measured temperature is higher than the desired temperature T
set
, the device activates
the air conditioning system by sending a message or KNX telegram to the actuator that handles it; when the
measured temperature reaches the value (T
set
-
ΔT
hysteresis
), whereby
ΔT
hysteresis
identifies the differential adjustment
of the air conditioning system, the device disables the air conditioning system by sending another message. In
this way, there are two decision thresholds for activation and deactivation of the air conditioning system: he first
being the desired temperature T
set
above which the device activates the system, whereas the second is the value
(T
set
-
ΔT
hysteresis
) below which the air conditioning system is deactivated.
In the ETS application program, two different parameters are available for the hysteresis value for heating and
cooling: the values usually differ depending on the system type and its inertia.
In the ETS application program, the default 2-point hysteresis control algorithm foresees inferior hysteresis for
heating and superior for cooling. If Heating and/or cooling type = floor radiant panels or ceiling radiant panels, it is
possible to select the hysteresis position according to the described second mode, i.e. with superior hysteresis for
heating and inferior for cooling.
The desired temperature (T
set
) is generally different for each one of the 4 operating modes and for heating/cooling
modes. The different values are defined for the first time during ETS configuration and can be modified later on.
In order to optimize energy saving (for each extra degree of room temperature, outbound dispersions and energy
consumption go up 6%), it is possible to take advantage of the multifunctionality of the domotic system, for example
with:
•
Hour programming with automatic commutation of the operating mode by means of KNX supervisor;
•
Automatic commutation of the operating mode according to window opening for air refreshment; •
Circuit deactivation when desired temperature is reached;
•
Flow temperature reduction in case of partial load.
.
