IRSC Zone
http://www.zennio.com
Technical Support:
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If, furthermore, an additional
calibration
of +1ºC has been parameterised under
“Increase/decrease temperature sent to the A/C unit”, an extra degree will be added,
resulting a final setpoint of 25ºC (note that the calibration has a higher priority than the
parameterised temperature range).
However, since there is a heat source that overheats the air returning to the machine,
the built-in thermostatic control of the A/C unit understands that the ambient
temperature is high enough (even higher than the setpoint), which makes the unit stop
generating heat, even if the ambient temperatures in Z1 and Z2 is different from that
measured by the internal sensor of the A/C unit. To prevent this situation, it is
convenient to enable the “Temperature returned from external sensor” parameter in
ETS, as the temperature measured in the return air duct is approximately equal to that
registered by the internal sensor of the A/C unit. For instance:
External temperature returned = 26.5ºC
IRSC Zone will then look for the maximum among the setpoint temperatures of zones
Z1 and Z2, and, afterwards, for the maximum between this (25ºC, which is truncated to
24ºC) and the external temperature (26.5ºC), resulting to be 26.5ºC. By default, this
value is then internally increased by one degree (27.5ºC) when the external
temperature function is active. And then, another degree is added again because of the
parameterised calibration (28.5ºC). Finally, the value 28.5ºC is sent to the unit through
the “A/C unit – setpoint status” object. This way, the air machine will keep generating
enough hot air even if its own sensor is measuring an ambient temperature of about
26.5ºC. To sum up:
Setpoint comparison
26.5ºC.
Restriction
24ºC.
External return temperature
26.5ºC.
Extra degree (because of the external return temperature)
27.5ºC
Calibration
28.5ºC. (value sent to the machine).
From that moment, IRSC Zone will send the appropriate orders to the grilles in zones
Z1 and Z2 (according to the parameterised algorithm for the thermostatic control for
heating) so that the heat generated by the unit is conveniently directed to the zones,
depending on their setpoint and reference temperatures..
