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Once these limits are established, the temperature restriction will only be considered if the
value "1" has been received through the binary object "Temperature restriction", which is
enabled when this parameter is set. Sending the value "0" (the value by default) to this object
will mean that the setpoint temperature should not be subject to the restrictions.
Note:
the setpoint temperature sent to the machine may exceed the parameterized
restrictions (even if the “Temperature restriction” object has the value “1”) in the case of
having parameterized a calibration (parameter
“Increase (heat) / Decrease (cool) temperature
sent to the A/C unit by
”, explained below) or if the “Temperature returned from external
sensor
” parameter, explained next, is enabled.
Temperature returned from external sensor:
this parameter can be optionally enabled
with the aim of adapting the general setpoint calculation process in certain cases when a heat
or cool source is affecting the temperature of the returned air that arrives back to the machine,
while it does not affect the ambient temperature of the enabled zones. When enabled, this
parameter deploys a 2-
byte object, “External Temperature Returned”, to be linked to a KNX
sensor (see
Annex I
to better identify the proper location for the sensor in the installation).
During the calculation of the general setpoint, IRSC-Zone will consider this return temperature
as an additional reference, so it will compare it to the setpoints of the different zones that are
ON at that moment.
If the return temperature is higher (mode “Heat”) or lower (mode “Cool”)
than the desired temperatures for the zones, IRSC-Zone will require the machine to make an
“extra effort”, and will send (through the “A/C Unit – Setpoint Status” object) a general setpoint
equal to the return temperature increased (mode “Heat”) or decreased (mode “Cool”) by 1ºC.
It is recommended to read the application example in
Annex III
for a better comprehension.
Note:
It is necessary that the external KNX sensor periodically sends the measured
temperature (the period should not be more than one hour). In case IRSC-Zone does not
receive any temperature through the Returned Temperature object within 60 minutes, it will
stop taking into account this external temperature for the calculation process.
Increase (heat) / Decrease (cool) temperature sent to the A/C unit by:
sets an
additional temperature value (calibration), in ºC, which will be taken into account while
calculating the setpoint temperature that will be sent to the A/C unit. Depending on the current
working mode of the machine (Heat or Cool), this value will be added or subtracted,
respectively, to the resultant temperature (after applying the restrictions and the comparison to
returned temperature, if they apply).
