51
Service manual
Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
In addition to the parameters present in the table, the other abbreviations in the graph indicate:
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Req = thermoregulation demand;
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YVL = status of solenoid valve in liquid line;
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EEV = status of electronic expansion valve;
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C inv = status of inverter compressor;
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C2 = status of ON/OFF compressor.
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t = time.
When the thermoregulation demand exceeds the percentage required for starting the inverter compressor, the controller
feeds the solenoid valve in the liquid line (where fitted) and commands the electronic expansion valve to get pre-positioned
at the number of pitches set in parameter “ET24”.
Irrespective of the thermoregulation demand, the percentage start-up speed is kept for the time set in parameter “CO20”.
Once the time set in parameter “CO20” has elapsed, the compressor speed follows the thermoregulation demand.
If the thermoregulation demand exceeds the ON/OFF compressor activation value in the course of thermoregulation, the
controller reduces the speed of the inverter compressor to the min. speed setpoint, after which it starts the ON/OFF com
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pressor, on condition that the delays related to the functions of parameters “CO02”, “CO03” and “CO04” are met.
After ON/OFF compressor start-up, the variation of the thermoregulation demand will be fulfilled by changing the inverter
compressor speed.
As the controller has no other compressors to start, the inverter compressor speed will be modulated from the min. to the
max. value.
During thermoregulation the controller stops the ON/OFF compressor after the min. time of operation set in parameter
“CO1” is met, if the thermoregulation demand causes the inverter compressor speed to drop below the min. value.
If the thermoregulation demand continues to drop, the inverter compressor will follow the decreasing demand and will con
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sequently reduce its speed.
The speed of the inverter compressor will drop until the min. value and it will be kept unaltered until the thermoregulation
demand goes down to zero.
When the thermoregulation demand is completed, the controller stops the inverter compressor. after a short delay, it closes
the electronic expansion valve and the solenoid valve in the fluid line (where fitted).
In refrigerant circuits featuring an inverter compressor and an on-off compressor, when the inverter compressor resumes
operation after an alarm while the on-off compressor is in operation, the controller resets the demand to the on-off compres
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sor and stops it, after which it initiates a start-up procedure prioritising the inverter compressor.
3 Software functions
Summary of Contents for UATYA-B
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