Daikin UATYA-B, Руководство по эксплуатации

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Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
A graphical representation is shown below.
%
EFA12
TCond °C
EFA13
EFA7
EFA6
EFA8
EFA10 EFA11 EFA9
1c
2c
Fig. 35 Graphical representation of air condensation control
In addition to the parameters listed in the table, the abbreviations in the graph are:
- Tcond = Condensing temperature
- % = percentage value of signal for fan control
- 1c = one compressor in operation
- 2c = two compressors in operation
When the compressor is started up and the condensing temperature reaches the value stored in parameter "EFA9", the
controller starts ventilation at max. speed for as long as the time set in parameter “EFA3”, after which it switches ventilation
back to the min. speed as specified in parameter “EFA6”.
If the condensing temperature rises to the value resulting from the sum of parameters “EFA9” + “EFA13”, the controller
starts adjusting the fan speed.
When only one compressor is in operation in the refrigerant circuit, ranging between the condensing temperature value
resulting from the sum of parameters “EFA9” + “EFA13” and the value in parameter “EFA10”, the fan speed varies propor -
tionally between values “EFA6” and “EFA7”.
When both compressors are in operation in the refrigerant circuit, ranging between the condensing temperature value resul
-
ting from the sum of parameters “EFA9” + “EFA13” and the value in parameter “EFA11”, the fan speed varies proportionally
between values “EFA6” and “EFA8”.
Irrespective of the number of compressors in operation, the fan speed is kept constant at the setpoint in parameter “EFA6”
from the value below the condensing temperature - sum of parameters “EFA9” + “EFA13” - to the value resulting from the
difference between parameters “EFA9” - “EFA12”.
If the condensing temperature value drops below the difference between parameters “EFA9” - “EFA12”, the controller stops
ventilation.
Where capacity reduction is overridden due to high pressure, ventilation control is performed as in cases
when both compressors are in operation.
3 Software functions